1162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich/* 2162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * NVEC: NVIDIA compliant embedded controller interface 3162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * 4162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.lauchpad.net> 5162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * 6162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * Authors: Pierre-Hugues Husson <phhusson@free.fr> 7162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * Ilya Petrov <ilya.muromec@gmail.com> 8162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * Marc Dietrich <marvin24@gmx.de> 9791c4a642721552204d8defdbd6a3e93cd411f79Julian Andres Klode * Julian Andres Klode <jak@jak-linux.org> 10162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * 11162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * This file is subject to the terms and conditions of the GNU General Public 12162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * License. See the file "COPYING" in the main directory of this archive 13162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * for more details. 14162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * 15162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich */ 16162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 17162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich/* #define DEBUG */ 1832890b983086136fef8721363a2d3860f337ad53Marc Dietrich 1912b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/kernel.h> 203b769edd58371fb70417c3f43c6d4a2da075703aMarc Dietrich#include <linux/module.h> 210b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode#include <linux/atomic.h> 2212b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/clk.h> 2332890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/completion.h> 2412b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/delay.h> 2512b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/err.h> 2612b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/gpio.h> 2732890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/interrupt.h> 28162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich#include <linux/io.h> 2932890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/irq.h> 307990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich#include <linux/of.h> 317990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich#include <linux/of_gpio.h> 3232890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/list.h> 3312b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/mfd/core.h> 3412b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/mutex.h> 3532890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/notifier.h> 3612b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/slab.h> 3712b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/spinlock.h> 3812b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/workqueue.h> 39162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 4032890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include "nvec.h" 4132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 42391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG 0x00 43391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG_PACKET_MODE_EN (1<<10) 44391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG_NEW_MASTER_SFM (1<<11) 45391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG_DEBOUNCE_CNT_SHIFT 12 46391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode 47391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_CNFG 0x20 48d3f862aec400dd831a4bdbea107fd85419bddab1Julian Andres Klode#define I2C_SL_NEWSL (1<<2) 49391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_NACK (1<<1) 50391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_RESP (1<<0) 51391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_IRQ (1<<3) 52391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define END_TRANS (1<<4) 53391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define RCVD (1<<2) 54391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define RNW (1<<1) 55391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode 56391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_RCVD 0x24 57391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_STATUS 0x28 58391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_ADDR1 0x2c 59391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_ADDR2 0x30 60391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_DELAY_COUNT 0x3c 61391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode 62bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode/** 63bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * enum nvec_msg_category - Message categories for nvec_msg_alloc() 64bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * @NVEC_MSG_RX: The message is an incoming message (from EC) 65bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * @NVEC_MSG_TX: The message is an outgoing message (to EC) 66bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode */ 67bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klodeenum nvec_msg_category { 68bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode NVEC_MSG_RX, 69bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode NVEC_MSG_TX, 70bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode}; 71bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode 72518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrichenum nvec_sleep_subcmds { 73518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich GLOBAL_EVENTS, 7493eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich AP_PWR_DOWN, 7593eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich AP_SUSPEND, 76518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich}; 77518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich 7893eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich#define CNF_EVENT_REPORTING 0x01 7993eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich#define GET_FIRMWARE_VERSION 0x15 8093eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich#define LID_SWITCH BIT(1) 8193eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich#define PWR_BUTTON BIT(15) 8232890b983086136fef8721363a2d3860f337ad53Marc Dietrich 8332890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic struct nvec_chip *nvec_power_handle; 8432890b983086136fef8721363a2d3860f337ad53Marc Dietrich 8528397dc9a6de41eafbd76a799883ace8f0570bd0Geert Uytterhoevenstatic const struct mfd_cell nvec_devices[] = { 86f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 87162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-kbd", 88162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 1, 89f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 90f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 91162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-mouse", 92162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 1, 93f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 94f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 95162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-power", 96162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 1, 97f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 98f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 99162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-power", 100162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 2, 101f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 10297cc26576fa2b0eb1aad1b29515bb0a32f86c45cIlya Petrov { 103ac562680577a28fa98ebecebff5e5097ccf9a9d2Marc Dietrich .name = "nvec-paz00", 10497cc26576fa2b0eb1aad1b29515bb0a32f86c45cIlya Petrov .id = 1, 10597cc26576fa2b0eb1aad1b29515bb0a32f86c45cIlya Petrov }, 106f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich}; 107f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 108bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 109bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_register_notifier - Register a notifier with nvec 110bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 111bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nb: The notifier block to register 112bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 113bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Registers a notifier with @nvec. The notifier will be added to an atomic 114bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * notifier chain that is called for all received messages except those that 115bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * correspond to a request initiated by nvec_write_sync(). 116bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 11732890b983086136fef8721363a2d3860f337ad53Marc Dietrichint nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, 118162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich unsigned int events) 11932890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 12032890b983086136fef8721363a2d3860f337ad53Marc Dietrich return atomic_notifier_chain_register(&nvec->notifier_list, nb); 12132890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 12232890b983086136fef8721363a2d3860f337ad53Marc DietrichEXPORT_SYMBOL_GPL(nvec_register_notifier); 12332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 124bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 125111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich * nvec_unregister_notifier - Unregister a notifier with nvec 126111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich * @nvec: A &struct nvec_chip 127111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich * @nb: The notifier block to unregister 128111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich * 129111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich * Unregisters a notifier with @nvec. The notifier will be removed from the 130111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich * atomic notifier chain. 131111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich */ 132111c158787b2a2036c444f735370cb6aef823f78Marc Dietrichint nvec_unregister_notifier(struct nvec_chip *nvec, struct notifier_block *nb) 133111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich{ 134111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich return atomic_notifier_chain_unregister(&nvec->notifier_list, nb); 135111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich} 136111c158787b2a2036c444f735370cb6aef823f78Marc DietrichEXPORT_SYMBOL_GPL(nvec_unregister_notifier); 137111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich 138111c158787b2a2036c444f735370cb6aef823f78Marc Dietrich/** 139bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_status_notifier - The final notifier 140bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 141bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Prints a message about control events not handled in the notifier 142bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * chain. 143bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 144162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic int nvec_status_notifier(struct notifier_block *nb, 145162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich unsigned long event_type, void *data) 14632890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 14750d4656a2304e48917a8e2b9df99f69d50b8a0aaMarc Dietrich struct nvec_chip *nvec = container_of(nb, struct nvec_chip, 14850d4656a2304e48917a8e2b9df99f69d50b8a0aaMarc Dietrich nvec_status_notifier); 14932890b983086136fef8721363a2d3860f337ad53Marc Dietrich unsigned char *msg = (unsigned char *)data; 15032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 151162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (event_type != NVEC_CNTL) 15232890b983086136fef8721363a2d3860f337ad53Marc Dietrich return NOTIFY_DONE; 15332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 15450d4656a2304e48917a8e2b9df99f69d50b8a0aaMarc Dietrich dev_warn(nvec->dev, "unhandled msg type %ld\n", event_type); 155a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich print_hex_dump(KERN_WARNING, "payload: ", DUMP_PREFIX_NONE, 16, 1, 156a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich msg, msg[1] + 2, true); 15732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 15832890b983086136fef8721363a2d3860f337ad53Marc Dietrich return NOTIFY_OK; 15932890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 16032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 161bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 162bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_msg_alloc: 163bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 164bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * @category: Pool category, see &enum nvec_msg_category 165bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 166bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Allocate a single &struct nvec_msg object from the message pool of 167bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec. The result shall be passed to nvec_msg_free() if no longer 168bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * used. 169bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * 170bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * Outgoing messages are placed in the upper 75% of the pool, keeping the 171bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * lower 25% available for RX buffers only. The reason is to prevent a 172bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * situation where all buffers are full and a message is thus endlessly 173bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * retried because the response could never be processed. 174bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 175bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klodestatic struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec, 176bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode enum nvec_msg_category category) 1770b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode{ 178bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode int i = (category == NVEC_MSG_TX) ? (NVEC_POOL_SIZE / 4) : 0; 1790b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 180bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode for (; i < NVEC_POOL_SIZE; i++) { 1810b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { 1820b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); 1830b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode return &nvec->msg_pool[i]; 1840b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode } 1850b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode } 1860b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 187bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode dev_err(nvec->dev, "could not allocate %s buffer\n", 188bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode (category == NVEC_MSG_TX) ? "TX" : "RX"); 1890b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 1900b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode return NULL; 1910b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode} 1920b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 193bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 194bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_msg_free: 195bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 196bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @msg: A message (must be allocated by nvec_msg_alloc() and belong to @nvec) 197bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 198bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Free the given message 199bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 200705a421238964e26f13a87d01cefa229eb8a458dDenis Efremovvoid nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) 2010b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode{ 2027b77065793b8de101c7be3829b4ff8a4618a7172Julian Andres Klode if (msg != &nvec->tx_scratch) 2037b77065793b8de101c7be3829b4ff8a4618a7172Julian Andres Klode dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); 2040b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode atomic_set(&msg->used, 0); 2050b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode} 206198dd26714ba4a60ccc5ce70bc4506613b4f0c2dJulian Andres KlodeEXPORT_SYMBOL_GPL(nvec_msg_free); 2070b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 2088517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode/** 2098517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * nvec_msg_is_event - Return %true if @msg is an event 2108517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * @msg: A message 2118517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode */ 2128517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klodestatic bool nvec_msg_is_event(struct nvec_msg *msg) 2138517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode{ 2148517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return msg->data[0] >> 7; 2158517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode} 2168517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode 2178517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode/** 2188517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * nvec_msg_size - Get the size of a message 2198517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * @msg: The message to get the size for 2208517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * 2218517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * This only works for received messages, not for outgoing messages. 2228517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode */ 2238517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klodestatic size_t nvec_msg_size(struct nvec_msg *msg) 2248517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode{ 2258517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode bool is_event = nvec_msg_is_event(msg); 2268517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode int event_length = (msg->data[0] & 0x60) >> 5; 2278517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode 2288517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode /* for variable size, payload size in byte 1 + count (1) + cmd (1) */ 2298517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode if (!is_event || event_length == NVEC_VAR_SIZE) 2308517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return (msg->pos || msg->size) ? (msg->data[1] + 2) : 0; 2318517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode else if (event_length == NVEC_2BYTES) 2328517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return 2; 2338517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode else if (event_length == NVEC_3BYTES) 2348517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return 3; 235aea2cda3d817a53ee13ffe0105644d1ac500cc5ePawel Lebioda return 0; 2368517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode} 2378517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode 238bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 239bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_gpio_set_value - Set the GPIO value 240bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 241bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @value: The value to write (0 or 1) 242bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 243bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Like gpio_set_value(), but generating debugging information 244bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 245e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klodestatic void nvec_gpio_set_value(struct nvec_chip *nvec, int value) 246e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode{ 247e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode dev_dbg(nvec->dev, "GPIO changed from %u to %u\n", 248e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode gpio_get_value(nvec->gpio), value); 249e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode gpio_set_value(nvec->gpio, value); 250e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode} 251e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode 252bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 253bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_write_async - Asynchronously write a message to NVEC 254bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: An nvec_chip instance 255bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @data: The message data, starting with the request type 256bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @size: The size of @data 257bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 258bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Queue a single message to be transferred to the embedded controller 259bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * and return immediately. 260bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 261bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Returns: 0 on success, a negative error code on failure. If a failure 262bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * occured, the nvec driver may print an error. 263bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 2641b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klodeint nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, 265162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich short size) 26632890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 2670cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_msg *msg; 2680cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned long flags; 26932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 270bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode msg = nvec_msg_alloc(nvec, NVEC_MSG_TX); 271bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode 2721b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode if (msg == NULL) 2731b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode return -ENOMEM; 2741b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode 27532890b983086136fef8721363a2d3860f337ad53Marc Dietrich msg->data[0] = size; 27632890b983086136fef8721363a2d3860f337ad53Marc Dietrich memcpy(msg->data + 1, data, size); 27732890b983086136fef8721363a2d3860f337ad53Marc Dietrich msg->size = size + 1; 27832890b983086136fef8721363a2d3860f337ad53Marc Dietrich 2790cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 28032890b983086136fef8721363a2d3860f337ad53Marc Dietrich list_add_tail(&msg->node, &nvec->tx_data); 2810cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 28232890b983086136fef8721363a2d3860f337ad53Marc Dietrich 283033d9959ed2dc1029217d4165f80a71702dc578eLinus Torvalds schedule_work(&nvec->tx_work); 2841b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode 2851b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode return 0; 28632890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 28732890b983086136fef8721363a2d3860f337ad53Marc DietrichEXPORT_SYMBOL(nvec_write_async); 28832890b983086136fef8721363a2d3860f337ad53Marc Dietrich 289bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 290bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_write_sync - Write a message to nvec and read the response 291bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: An &struct nvec_chip 292bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @data: The data to write 293bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @size: The size of @data 294bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 295bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * This is similar to nvec_write_async(), but waits for the 296bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * request to be answered before returning. This function 297bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * uses a mutex and can thus not be called from e.g. 298bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * interrupt handlers. 299bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 300bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Returns: A pointer to the response message on success, 301198dd26714ba4a60ccc5ce70bc4506613b4f0c2dJulian Andres Klode * %NULL on failure. Free with nvec_msg_free() once no longer 302198dd26714ba4a60ccc5ce70bc4506613b4f0c2dJulian Andres Klode * used. 303bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 3040cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestruct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, 3050cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode const unsigned char *data, short size) 3060cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 3070cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_msg *msg; 3080cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3090cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_lock(&nvec->sync_write_mutex); 3100cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3110cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->sync_write_pending = (data[1] << 8) + data[0]; 3121b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode 3134b8bf03d7f775271c2016e76011b113bc5f83c14Marc Dietrich if (nvec_write_async(nvec, data, size) < 0) { 3144b8bf03d7f775271c2016e76011b113bc5f83c14Marc Dietrich mutex_unlock(&nvec->sync_write_mutex); 3151b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode return NULL; 3164b8bf03d7f775271c2016e76011b113bc5f83c14Marc Dietrich } 3170cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3180cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", 3190cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->sync_write_pending); 3200cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (!(wait_for_completion_timeout(&nvec->sync_write, 3210cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msecs_to_jiffies(2000)))) { 3220cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_warn(nvec->dev, "timeout waiting for sync write to complete\n"); 3230cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3240cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode return NULL; 3250cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 3260cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3270cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); 3280cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3290cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg = nvec->last_sync_msg; 3300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3310cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3320cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3330cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode return msg; 3340cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 3350cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres KlodeEXPORT_SYMBOL(nvec_write_sync); 3360cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 337bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 338518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich * nvec_toggle_global_events - enables or disables global event reporting 339518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich * @nvec: nvec handle 340518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich * @state: true for enable, false for disable 341518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich * 342518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich * This switches on/off global event reports by the embedded controller. 343518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich */ 344518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrichstatic void nvec_toggle_global_events(struct nvec_chip *nvec, bool state) 345518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich{ 346518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich unsigned char global_events[] = { NVEC_SLEEP, GLOBAL_EVENTS, state }; 347518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich 348518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich nvec_write_async(nvec, global_events, 3); 349518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich} 350518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich 351518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich/** 35293eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich * nvec_event_mask - fill the command string with event bitfield 35393eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich * ev: points to event command string 35493eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich * mask: bit to insert into the event mask 35593eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich * 35693eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich * Configure event command expects a 32 bit bitfield which describes 35793eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich * which events to enable. The bitfield has the following structure 35893eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich * (from highest byte to lowest): 35993eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich * system state bits 7-0 36093eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich * system state bits 15-8 36193eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich * oem system state bits 7-0 36293eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich * oem system state bits 15-8 36393eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich */ 36493eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrichstatic void nvec_event_mask(char *ev, u32 mask) 36593eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich{ 366815fb010fcba058df43f30fa614cf954dd9e7bccWei Yongjun ev[3] = mask >> 16 & 0xff; 367815fb010fcba058df43f30fa614cf954dd9e7bccWei Yongjun ev[4] = mask >> 24 & 0xff; 368815fb010fcba058df43f30fa614cf954dd9e7bccWei Yongjun ev[5] = mask >> 0 & 0xff; 369815fb010fcba058df43f30fa614cf954dd9e7bccWei Yongjun ev[6] = mask >> 8 & 0xff; 37093eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich} 37193eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich 37293eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich/** 373bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_request_master - Process outgoing messages 374bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 375bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 376bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Processes all outgoing requests by sending the request and awaiting the 377bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * response, then continuing with the next request. Once a request has a 378bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * matching response, it will be freed and removed from the list. 379bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 38032890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic void nvec_request_master(struct work_struct *work) 38132890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 38232890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); 3830cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned long flags; 3840cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode long err; 3850cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_msg *msg; 3860cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3870cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode while (!list_empty(&nvec->tx_data)) { 3890cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node); 3900cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 3910cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 0); 3920cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode err = wait_for_completion_interruptible_timeout( 3930cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode &nvec->ec_transfer, msecs_to_jiffies(5000)); 3940cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3950cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (err == 0) { 3960cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_warn(nvec->dev, "timeout waiting for ec transfer\n"); 3970cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 1); 3980cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg->pos = 0; 3990cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 40032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 4010cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 4020cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4030cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (err > 0) { 4040cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode list_del_init(&msg->node); 4050cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, msg); 4060cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 4070cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 4080cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 40932890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 41032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 411bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 412bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * parse_msg - Print some information and call the notifiers on an RX message 413bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 414bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @msg: A message received by @nvec 415bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 416bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Paarse some pieces of the message and then call the chain of notifiers 417bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * registered via nvec_register_notifier. 418bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 41932890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) 42032890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 421162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if ((msg->data[0] & 1 << 7) == 0 && msg->data[3]) { 4226a371978836049656525bb0719187362c5114232Andy Shevchenko dev_err(nvec->dev, "ec responded %*ph\n", 4, msg->data); 42332890b983086136fef8721363a2d3860f337ad53Marc Dietrich return -EINVAL; 42432890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 42532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 426a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich if ((msg->data[0] >> 7) == 1 && (msg->data[0] & 0x0f) == 5) 427a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich print_hex_dump(KERN_WARNING, "ec system event ", 428a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich DUMP_PREFIX_NONE, 16, 1, msg->data, 429a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich msg->data[1] + 2, true); 43032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 431162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, 432162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich msg->data); 43332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 43432890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 43532890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 43632890b983086136fef8721363a2d3860f337ad53Marc Dietrich 437bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 438bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_dispatch - Process messages received from the EC 439bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 440bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 441bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Process messages previously received from the EC and put into the RX 442bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * queue of the &struct nvec_chip instance associated with @work. 443bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 44432890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic void nvec_dispatch(struct work_struct *work) 44532890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 44632890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); 4470cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned long flags; 44832890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_msg *msg; 44932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 4500cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 451162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich while (!list_empty(&nvec->rx_data)) { 45232890b983086136fef8721363a2d3860f337ad53Marc Dietrich msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); 45332890b983086136fef8721363a2d3860f337ad53Marc Dietrich list_del_init(&msg->node); 4540cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 45532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 456162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (nvec->sync_write_pending == 4570cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (msg->data[2] << 8) + msg->data[0]) { 45832890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_dbg(nvec->dev, "sync write completed!\n"); 45932890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->sync_write_pending = 0; 46032890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->last_sync_msg = msg; 46132890b983086136fef8721363a2d3860f337ad53Marc Dietrich complete(&nvec->sync_write); 46232890b983086136fef8721363a2d3860f337ad53Marc Dietrich } else { 46332890b983086136fef8721363a2d3860f337ad53Marc Dietrich parse_msg(nvec, msg); 4640cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, msg); 46532890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 4660cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 46732890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 4680cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 46932890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 47032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 471bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 472bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_tx_completed - Complete the current transfer 473bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 474bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 475bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * This is called when we have received an END_TRANS on a TX transfer. 476bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 4770cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_tx_completed(struct nvec_chip *nvec) 4780cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 4790cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* We got an END_TRANS, let's skip this, maybe there's an event */ 4800cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (nvec->tx->pos != nvec->tx->size) { 4810cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "premature END_TRANS, resending\n"); 4820cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx->pos = 0; 4830cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 0); 4840cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 4850cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 4860cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 4870cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 4880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 489bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 490bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_rx_completed - Complete the current transfer 491bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 492bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 493bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * This is called when we have received an END_TRANS on a RX transfer. 494bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 4950cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_rx_completed(struct nvec_chip *nvec) 4960cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 497210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode if (nvec->rx->pos != nvec_msg_size(nvec->rx)) { 4980cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "RX incomplete: Expected %u bytes, got %u\n", 4990cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) nvec_msg_size(nvec->rx), 5000cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) nvec->rx->pos); 5010cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 502210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode nvec_msg_free(nvec, nvec->rx); 503210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode nvec->state = 0; 504d6bdcf2e1019351cbc176e963b7756766bdd8721Julian Andres Klode 505d6bdcf2e1019351cbc176e963b7756766bdd8721Julian Andres Klode /* Battery quirk - Often incomplete, and likes to crash */ 506d6bdcf2e1019351cbc176e963b7756766bdd8721Julian Andres Klode if (nvec->rx->data[0] == NVEC_BAT) 507d6bdcf2e1019351cbc176e963b7756766bdd8721Julian Andres Klode complete(&nvec->ec_transfer); 508d6bdcf2e1019351cbc176e963b7756766bdd8721Julian Andres Klode 509210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode return; 510210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode } 511210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode 5120cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock(&nvec->rx_lock); 5130cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5140cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* add the received data to the work list 5150cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode and move the ring buffer pointer to the next entry */ 5160cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode list_add_tail(&nvec->rx->node, &nvec->rx_data); 5170cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5180cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock(&nvec->rx_lock); 5190cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5200cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 5210cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5220cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (!nvec_msg_is_event(nvec->rx)) 5230cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode complete(&nvec->ec_transfer); 5240cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 525033d9959ed2dc1029217d4165f80a71702dc578eLinus Torvalds schedule_work(&nvec->rx_work); 5260cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 5270cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5280cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode/** 5290cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * nvec_invalid_flags - Send an error message about invalid flags and jump 5300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @nvec: The nvec device 5310cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @status: The status flags 5320cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @reset: Whether we shall jump to state 0. 5330cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode */ 5340cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status, 5350cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode bool reset) 5360cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 5370cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n", 5380cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status, nvec->state); 5390cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (reset) 5400cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 5410cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 5420cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5430cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode/** 5440cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * nvec_tx_set - Set the message to transfer (nvec->tx) 545bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 546bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 547bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Gets the first entry from the tx_data list of @nvec and sets the 548bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * tx member to it. If the tx_data list is empty, this uses the 549bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * tx_scratch message to send a no operation message. 5500cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode */ 5510cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_tx_set(struct nvec_chip *nvec) 5520cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 5530cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock(&nvec->tx_lock); 5540cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (list_empty(&nvec->tx_data)) { 5550cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "empty tx - sending no-op\n"); 5560cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode memcpy(nvec->tx_scratch.data, "\x02\x07\x02", 3); 5570cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx_scratch.size = 3; 5580cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx_scratch.pos = 0; 5590cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx = &nvec->tx_scratch; 5600cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode list_add_tail(&nvec->tx->node, &nvec->tx_data); 5610cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 5620cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx = list_first_entry(&nvec->tx_data, struct nvec_msg, 5630cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode node); 5640cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx->pos = 0; 5650cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 5660cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock(&nvec->tx_lock); 5670cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5680cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, "Sending message of length %u, command 0x%x\n", 5690cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint)nvec->tx->size, nvec->tx->data[1]); 5700cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 5710cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5720cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode/** 5730cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * nvec_interrupt - Interrupt handler 5740cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @irq: The IRQ 5750cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @dev: The nvec device 576bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 577bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Interrupt handler that fills our RX buffers and empties our TX 578bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * buffers. This uses a finite state machine with ridiculous amounts 579bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * of error checking, in order to be fairly reliable. 5800cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode */ 581f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrichstatic irqreturn_t nvec_interrupt(int irq, void *dev) 58232890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 58332890b983086136fef8721363a2d3860f337ad53Marc Dietrich unsigned long status; 5840cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned int received = 0; 5850cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned char to_send = 0xff; 5860cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW; 5870cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_chip *nvec = dev; 5880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned int state = nvec->state; 58932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 5900cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status = readl(nvec->base + I2C_SL_STATUS); 59132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 5920cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* Filter out some errors */ 5930cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) { 5940cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "unexpected irq mask %lx\n", status); 5950cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode return IRQ_HANDLED; 59632890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 5970cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & I2C_SL_IRQ) == 0) { 5980cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "Spurious IRQ\n"); 59932890b983086136fef8721363a2d3860f337ad53Marc Dietrich return IRQ_HANDLED; 6000cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 60132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 6020cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* The EC did not request a read, so it send us something, read it */ 6030cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & RNW) == 0) { 6040cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode received = readl(nvec->base + I2C_SL_RCVD); 605162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (status & RCVD) 6060cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode writel(0, nvec->base + I2C_SL_RCVD); 6070cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 608162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 6090cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status == (I2C_SL_IRQ | RCVD)) 6100cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 6110cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 6120cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode switch (nvec->state) { 6130cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 0: /* Verify that its a transfer start, the rest later */ 6140cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status != (I2C_SL_IRQ | RCVD)) 6150cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, false); 6160cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 6170cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 1: /* command byte */ 6180cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status != I2C_SL_IRQ) { 6190cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 62032890b983086136fef8721363a2d3860f337ad53Marc Dietrich } else { 621bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode nvec->rx = nvec_msg_alloc(nvec, NVEC_MSG_RX); 6228da798634343de8dbb8c1593923f8368db69f838Julian Andres Klode /* Should not happen in a normal world */ 6238da798634343de8dbb8c1593923f8368db69f838Julian Andres Klode if (unlikely(nvec->rx == NULL)) { 6248da798634343de8dbb8c1593923f8368db69f838Julian Andres Klode nvec->state = 0; 6258da798634343de8dbb8c1593923f8368db69f838Julian Andres Klode break; 6268da798634343de8dbb8c1593923f8368db69f838Julian Andres Klode } 6270cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->data[0] = received; 6280cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->pos = 1; 6290cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 2; 6300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 6310cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 6320cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 2: /* first byte after command */ 6330cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) { 6340cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode udelay(33); 6350cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (nvec->rx->data[0] != 0x01) { 6360cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, 6370cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "Read without prior read command\n"); 6380cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 6390cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 64032890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 6410cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, nvec->rx); 6420cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 3; 6430cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_tx_set(nvec); 6440cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode BUG_ON(nvec->tx->size < 1); 6450cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode to_send = nvec->tx->data[0]; 6460cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx->pos = 1; 6470cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else if (status == (I2C_SL_IRQ)) { 6480cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode BUG_ON(nvec->rx == NULL); 6490cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->data[1] = received; 6500cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->pos = 2; 6510cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 4; 6520cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 6530cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 65432890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 6550cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 6560cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 3: /* EC does a block read, we transmit data */ 6570cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status & END_TRANS) { 6580cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_tx_completed(nvec); 6590cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else if ((status & RNW) == 0 || (status & RCVD)) { 6600cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 6610cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) { 6620cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode to_send = nvec->tx->data[nvec->tx->pos++]; 6630cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 6640cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n", 6650cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx, 6660cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) (nvec->tx ? nvec->tx->pos : 0), 6670cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) (nvec->tx ? nvec->tx->size : 0)); 6680cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 66932890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 6700cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 6710cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 4: /* EC does some write, we read the data */ 6720cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & (END_TRANS | RNW)) == END_TRANS) 6730cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_rx_completed(nvec); 6740cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode else if (status & (RNW | RCVD)) 6750cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 6760cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE) 6770cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->data[nvec->rx->pos++] = received; 6780cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode else 6790cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, 680b77f2767a76eaf6a26eb3c2128877b362544b804Ebru Akagunduz "RX buffer overflow on %p: Trying to write byte %u of %u\n", 6816330f9cf347849de74899e5fac00bfecd84a6b43Dan Carpenter nvec->rx, nvec->rx ? nvec->rx->pos : 0, 6826330f9cf347849de74899e5fac00bfecd84a6b43Dan Carpenter NVEC_MSG_SIZE); 6830cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 6840cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode default: 6850cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 6860cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 68732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 6880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* If we are told that a new transfer starts, verify it */ 6890cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & (RCVD | RNW)) == RCVD) { 6900cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (received != nvec->i2c_addr) 6910cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, 6920cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "received address 0x%02x, expected 0x%02x\n", 6930cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode received, nvec->i2c_addr); 6940cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 1; 69532890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 6960cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 6970cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* Send data if requested, but not on end of transmission */ 6980cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & (RNW | END_TRANS)) == RNW) 6990cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode writel(to_send, nvec->base + I2C_SL_RCVD); 7000cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 7010cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* If we have send the first byte */ 7020cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) 7030cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 1); 7040cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 7050cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, 7060cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n", 7070cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (status & RNW) == 0 ? "received" : "R=", 7080cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode received, 7090cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (status & (RNW | END_TRANS)) ? "sent" : "S=", 7100cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode to_send, 7110cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode state, 7120cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status & END_TRANS ? " END_TRANS" : "", 7130cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status & RCVD ? " RCVD" : "", 7140cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status & RNW ? " RNW" : ""); 7150cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 716de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode 717de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode /* 718de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode * TODO: A correct fix needs to be found for this. 719de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode * 720de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode * We experience less incomplete messages with this delay than without 721de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode * it, but we don't know why. Help is appreciated. 722de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode */ 723de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode udelay(100); 724de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode 72532890b983086136fef8721363a2d3860f337ad53Marc Dietrich return IRQ_HANDLED; 72632890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 72732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 728f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrichstatic void tegra_init_i2c_slave(struct nvec_chip *nvec) 72932890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 73032890b983086136fef8721363a2d3860f337ad53Marc Dietrich u32 val; 73132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 73261c3b1971ad4c71c99919da949ac2043dfac8ee7Prashant Gaikwad clk_prepare_enable(nvec->i2c_clk); 733f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 734c0df5bf5369ec5d12d781491c95e3207ec5ee2b7Stephen Warren reset_control_assert(nvec->rst); 73532890b983086136fef8721363a2d3860f337ad53Marc Dietrich udelay(2); 736c0df5bf5369ec5d12d781491c95e3207ec5ee2b7Stephen Warren reset_control_deassert(nvec->rst); 73732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 73832890b983086136fef8721363a2d3860f337ad53Marc Dietrich val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | 739ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); 740f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich writel(val, nvec->base + I2C_CNFG); 741ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 742ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich clk_set_rate(nvec->i2c_clk, 8 * 80000); 743ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 744d3f862aec400dd831a4bdbea107fd85419bddab1Julian Andres Klode writel(I2C_SL_NEWSL, nvec->base + I2C_SL_CNFG); 745ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); 746ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 747ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1); 748ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich writel(0, nvec->base + I2C_SL_ADDR2); 74932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 750ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich enable_irq(nvec->irq); 751ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich} 752ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 753ebefae28cea729cb1fa9c944179f62d7dd65b10fMarc Dietrich#ifdef CONFIG_PM_SLEEP 754ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrichstatic void nvec_disable_i2c_slave(struct nvec_chip *nvec) 755ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich{ 756ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich disable_irq(nvec->irq); 757d3f862aec400dd831a4bdbea107fd85419bddab1Julian Andres Klode writel(I2C_SL_NEWSL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG); 75861c3b1971ad4c71c99919da949ac2043dfac8ee7Prashant Gaikwad clk_disable_unprepare(nvec->i2c_clk); 75932890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 760ebefae28cea729cb1fa9c944179f62d7dd65b10fMarc Dietrich#endif 76132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 76232890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic void nvec_power_off(void) 76332890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 76493eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich char ap_pwr_down[] = { NVEC_SLEEP, AP_PWR_DOWN }; 76593eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich 766518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich nvec_toggle_global_events(nvec_power_handle, false); 76793eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich nvec_write_async(nvec_power_handle, ap_pwr_down, 2); 76832890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 76932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 77095cd1860b8cddb69db91908b548294b567937551Marc Dietrich/* 77195cd1860b8cddb69db91908b548294b567937551Marc Dietrich * Parse common device tree data 77295cd1860b8cddb69db91908b548294b567937551Marc Dietrich */ 77395cd1860b8cddb69db91908b548294b567937551Marc Dietrichstatic int nvec_i2c_parse_dt_pdata(struct nvec_chip *nvec) 77495cd1860b8cddb69db91908b548294b567937551Marc Dietrich{ 77595cd1860b8cddb69db91908b548294b567937551Marc Dietrich nvec->gpio = of_get_named_gpio(nvec->dev->of_node, "request-gpios", 0); 77695cd1860b8cddb69db91908b548294b567937551Marc Dietrich 77795cd1860b8cddb69db91908b548294b567937551Marc Dietrich if (nvec->gpio < 0) { 77895cd1860b8cddb69db91908b548294b567937551Marc Dietrich dev_err(nvec->dev, "no gpio specified"); 77995cd1860b8cddb69db91908b548294b567937551Marc Dietrich return -ENODEV; 78095cd1860b8cddb69db91908b548294b567937551Marc Dietrich } 78195cd1860b8cddb69db91908b548294b567937551Marc Dietrich 78295cd1860b8cddb69db91908b548294b567937551Marc Dietrich if (of_property_read_u32(nvec->dev->of_node, "slave-addr", 78395cd1860b8cddb69db91908b548294b567937551Marc Dietrich &nvec->i2c_addr)) { 78495cd1860b8cddb69db91908b548294b567937551Marc Dietrich dev_err(nvec->dev, "no i2c address specified"); 78595cd1860b8cddb69db91908b548294b567937551Marc Dietrich return -ENODEV; 78695cd1860b8cddb69db91908b548294b567937551Marc Dietrich } 78795cd1860b8cddb69db91908b548294b567937551Marc Dietrich 78895cd1860b8cddb69db91908b548294b567937551Marc Dietrich return 0; 78995cd1860b8cddb69db91908b548294b567937551Marc Dietrich} 79095cd1860b8cddb69db91908b548294b567937551Marc Dietrich 79146620803c309d2bc10814b903b39d7647057b440Bill Pembertonstatic int tegra_nvec_probe(struct platform_device *pdev) 79232890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 793f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich int err, ret; 79432890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct clk *i2c_clk; 79532890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec; 79632890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_msg *msg; 797f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich struct resource *res; 798f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich void __iomem *base; 79993eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich char get_firmware_version[] = { NVEC_CNTL, GET_FIRMWARE_VERSION }, 80093eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich unmute_speakers[] = { NVEC_OEM0, 0x10, 0x59, 0x95 }, 80193eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich enable_event[7] = { NVEC_SYS, CNF_EVENT_REPORTING, true }; 80232890b983086136fef8721363a2d3860f337ad53Marc Dietrich 80315f1df57cef9228f03cb063159c4c71149001325Tugce Sirin if (!pdev->dev.of_node) { 8042c6cbdd0ef966cdf5e93ea17475a577dacf44dd7Marc Dietrich dev_err(&pdev->dev, "must be instantiated using device tree\n"); 8052c6cbdd0ef966cdf5e93ea17475a577dacf44dd7Marc Dietrich return -ENODEV; 8062c6cbdd0ef966cdf5e93ea17475a577dacf44dd7Marc Dietrich } 8072c6cbdd0ef966cdf5e93ea17475a577dacf44dd7Marc Dietrich 808f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich nvec = devm_kzalloc(&pdev->dev, sizeof(struct nvec_chip), GFP_KERNEL); 8095a9077a83321abe390b2dffde0e3fe2be0f4e6bbPawel Lebioda if (nvec == NULL) 81032890b983086136fef8721363a2d3860f337ad53Marc Dietrich return -ENOMEM; 8115a9077a83321abe390b2dffde0e3fe2be0f4e6bbPawel Lebioda 81232890b983086136fef8721363a2d3860f337ad53Marc Dietrich platform_set_drvdata(pdev, nvec); 81332890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->dev = &pdev->dev; 8147990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich 81595cd1860b8cddb69db91908b548294b567937551Marc Dietrich err = nvec_i2c_parse_dt_pdata(nvec); 81695cd1860b8cddb69db91908b548294b567937551Marc Dietrich if (err < 0) 81795cd1860b8cddb69db91908b548294b567937551Marc Dietrich return err; 818f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 819f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 82097f4be60178fec663baaa30a09ae102fd33373c2Thierry Reding base = devm_ioremap_resource(&pdev->dev, res); 82197f4be60178fec663baaa30a09ae102fd33373c2Thierry Reding if (IS_ERR(base)) 82297f4be60178fec663baaa30a09ae102fd33373c2Thierry Reding return PTR_ERR(base); 82332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 824b5b628ba4980762b290bb794d44dce629d0126f2Thierry Reding nvec->irq = platform_get_irq(pdev, 0); 825b5b628ba4980762b290bb794d44dce629d0126f2Thierry Reding if (nvec->irq < 0) { 826f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(&pdev->dev, "no irq resource?\n"); 827f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich return -ENODEV; 828f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich } 82932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 830c2b62f60f67e0375c09d3c385ba90999d39d3dceMarc Dietrich i2c_clk = devm_clk_get(&pdev->dev, "div-clk"); 831f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (IS_ERR(i2c_clk)) { 832f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(nvec->dev, "failed to get controller clock\n"); 833f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich return -ENODEV; 83432890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 83532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 836c0df5bf5369ec5d12d781491c95e3207ec5ee2b7Stephen Warren nvec->rst = devm_reset_control_get(&pdev->dev, "i2c"); 837c0df5bf5369ec5d12d781491c95e3207ec5ee2b7Stephen Warren if (IS_ERR(nvec->rst)) { 838c0df5bf5369ec5d12d781491c95e3207ec5ee2b7Stephen Warren dev_err(nvec->dev, "failed to get controller reset\n"); 839c0df5bf5369ec5d12d781491c95e3207ec5ee2b7Stephen Warren return PTR_ERR(nvec->rst); 840c0df5bf5369ec5d12d781491c95e3207ec5ee2b7Stephen Warren } 841c0df5bf5369ec5d12d781491c95e3207ec5ee2b7Stephen Warren 842f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich nvec->base = base; 843f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich nvec->i2c_clk = i2c_clk; 8440cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx = &nvec->msg_pool[0]; 845f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 84632890b983086136fef8721363a2d3860f337ad53Marc Dietrich ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); 84732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 84832890b983086136fef8721363a2d3860f337ad53Marc Dietrich init_completion(&nvec->sync_write); 8490cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode init_completion(&nvec->ec_transfer); 8500cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_init(&nvec->sync_write_mutex); 8510cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_init(&nvec->tx_lock); 8520cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_init(&nvec->rx_lock); 85332890b983086136fef8721363a2d3860f337ad53Marc Dietrich INIT_LIST_HEAD(&nvec->rx_data); 8540cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode INIT_LIST_HEAD(&nvec->tx_data); 85532890b983086136fef8721363a2d3860f337ad53Marc Dietrich INIT_WORK(&nvec->rx_work, nvec_dispatch); 85632890b983086136fef8721363a2d3860f337ad53Marc Dietrich INIT_WORK(&nvec->tx_work, nvec_request_master); 85732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 858f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich err = devm_gpio_request_one(&pdev->dev, nvec->gpio, GPIOF_OUT_INIT_HIGH, 859f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich "nvec gpio"); 860aed92bbcf4ce760c4d7848013a0db3bdd4ae9492Julian Andres Klode if (err < 0) { 861aed92bbcf4ce760c4d7848013a0db3bdd4ae9492Julian Andres Klode dev_err(nvec->dev, "couldn't request gpio\n"); 862f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich return -ENODEV; 863aed92bbcf4ce760c4d7848013a0db3bdd4ae9492Julian Andres Klode } 864aed92bbcf4ce760c4d7848013a0db3bdd4ae9492Julian Andres Klode 865f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich err = devm_request_irq(&pdev->dev, nvec->irq, nvec_interrupt, 0, 866f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich "nvec", nvec); 867f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (err) { 868f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(nvec->dev, "couldn't request irq\n"); 869f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich return -ENODEV; 870f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich } 871ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich disable_irq(nvec->irq); 872f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 873f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich tegra_init_i2c_slave(nvec); 874f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 87532890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* enable event reporting */ 876518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich nvec_toggle_global_events(nvec, true); 87732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 87832890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; 87932890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); 88032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 88132890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_power_handle = nvec; 88232890b983086136fef8721363a2d3860f337ad53Marc Dietrich pm_power_off = nvec_power_off; 88332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 88432890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* Get Firmware Version */ 88593eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich msg = nvec_write_sync(nvec, get_firmware_version, 2); 88632890b983086136fef8721363a2d3860f337ad53Marc Dietrich 8870cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (msg) { 8880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", 8890cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg->data[4], msg->data[5], msg->data[6], msg->data[7]); 89032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 8910cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, msg); 8920cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 89332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 894f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich ret = mfd_add_devices(nvec->dev, -1, nvec_devices, 89547e7b05001d8634704b1563ba93863194ac129f0Thierry Reding ARRAY_SIZE(nvec_devices), NULL, 0, NULL); 896162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (ret) 897f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(nvec->dev, "error adding subdevices\n"); 898f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 89932890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* unmute speakers? */ 90093eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich nvec_write_async(nvec, unmute_speakers, 4); 90132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 90232890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* enable lid switch event */ 90393eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich nvec_event_mask(enable_event, LID_SWITCH); 90493eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich nvec_write_async(nvec, enable_event, 7); 90532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 90632890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* enable power button event */ 90793eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich nvec_event_mask(enable_event, PWR_BUTTON); 90893eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich nvec_write_async(nvec, enable_event, 7); 90932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 91032890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 91132890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 91232890b983086136fef8721363a2d3860f337ad53Marc Dietrich 9131a6a8a8414f740f1dfde762837eeb3f2ce835919Bill Pembertonstatic int tegra_nvec_remove(struct platform_device *pdev) 91432890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 915f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 916f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 917518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich nvec_toggle_global_events(nvec, false); 918f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich mfd_remove_devices(nvec->dev); 919c2b62f60f67e0375c09d3c385ba90999d39d3dceMarc Dietrich nvec_unregister_notifier(nvec, &nvec->nvec_status_notifier); 920eb1e40a4dd0fb4095900e085fdd3ed259acbee29Tejun Heo cancel_work_sync(&nvec->rx_work); 921eb1e40a4dd0fb4095900e085fdd3ed259acbee29Tejun Heo cancel_work_sync(&nvec->tx_work); 922c2b62f60f67e0375c09d3c385ba90999d39d3dceMarc Dietrich /* FIXME: needs check wether nvec is responsible for power off */ 923c2b62f60f67e0375c09d3c385ba90999d39d3dceMarc Dietrich pm_power_off = NULL; 924f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 92532890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 92632890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 92732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 928ebefae28cea729cb1fa9c944179f62d7dd65b10fMarc Dietrich#ifdef CONFIG_PM_SLEEP 929ebefae28cea729cb1fa9c944179f62d7dd65b10fMarc Dietrichstatic int nvec_suspend(struct device *dev) 93032890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 931ebefae28cea729cb1fa9c944179f62d7dd65b10fMarc Dietrich struct platform_device *pdev = to_platform_device(dev); 93232890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 9339feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich struct nvec_msg *msg; 93493eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich char ap_suspend[] = { NVEC_SLEEP, AP_SUSPEND }; 93532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 93632890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_dbg(nvec->dev, "suspending\n"); 9379feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich 9389feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich /* keep these sync or you'll break suspend */ 93993eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich nvec_toggle_global_events(nvec, false); 94093eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich 94193eff83ff1640bef8062568687b5e0e41a0d4c42Marc Dietrich msg = nvec_write_sync(nvec, ap_suspend, sizeof(ap_suspend)); 9429feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich nvec_msg_free(nvec, msg); 9439feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich 944ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich nvec_disable_i2c_slave(nvec); 94532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 94632890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 94732890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 94832890b983086136fef8721363a2d3860f337ad53Marc Dietrich 949ebefae28cea729cb1fa9c944179f62d7dd65b10fMarc Dietrichstatic int nvec_resume(struct device *dev) 950162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich{ 951ebefae28cea729cb1fa9c944179f62d7dd65b10fMarc Dietrich struct platform_device *pdev = to_platform_device(dev); 95232890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 95332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 95432890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_dbg(nvec->dev, "resuming\n"); 955f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich tegra_init_i2c_slave(nvec); 956518945fbfbe9e2bc39057115aa23e25b084a03e0Marc Dietrich nvec_toggle_global_events(nvec, true); 95732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 95832890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 95932890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 96032890b983086136fef8721363a2d3860f337ad53Marc Dietrich#endif 96132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 9625d30566f7383f7f33a1c8ece38f5306bcd12890eThierry Redingstatic SIMPLE_DEV_PM_OPS(nvec_pm_ops, nvec_suspend, nvec_resume); 963ebefae28cea729cb1fa9c944179f62d7dd65b10fMarc Dietrich 9647990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich/* Match table for of_platform binding */ 965063f9f6a8705c5da3ee46c667a3e6e01eaf31560Bill Pembertonstatic const struct of_device_id nvidia_nvec_of_match[] = { 9667990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich { .compatible = "nvidia,nvec", }, 9677990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich {}, 9687990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich}; 9697990b0d7ec449b10da383bab191eb487185aadceMarc DietrichMODULE_DEVICE_TABLE(of, nvidia_nvec_of_match); 9707990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich 971162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic struct platform_driver nvec_device_driver = { 972162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .probe = tegra_nvec_probe, 97344b90a3fbcac0f233b71b4041fa76ea325caca33Bill Pemberton .remove = tegra_nvec_remove, 974162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .driver = { 97532890b983086136fef8721363a2d3860f337ad53Marc Dietrich .name = "nvec", 97632890b983086136fef8721363a2d3860f337ad53Marc Dietrich .owner = THIS_MODULE, 977ebefae28cea729cb1fa9c944179f62d7dd65b10fMarc Dietrich .pm = &nvec_pm_ops, 9787990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich .of_match_table = nvidia_nvec_of_match, 97932890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 98032890b983086136fef8721363a2d3860f337ad53Marc Dietrich}; 98132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 9829891b1ce6276912c54f66b7b0c8c1bcc42ca75ebMarc Dietrichmodule_platform_driver(nvec_device_driver); 983162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 98432890b983086136fef8721363a2d3860f337ad53Marc DietrichMODULE_ALIAS("platform:nvec"); 985162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc DietrichMODULE_DESCRIPTION("NVIDIA compliant embedded controller interface"); 986162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc DietrichMODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>"); 987162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc DietrichMODULE_LICENSE("GPL"); 988