1657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley/* 2657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * OMAP3517/3505-specific clock framework functions 3657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * 4657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * Copyright (C) 2010 Texas Instruments, Inc. 5ec538e30f7eded2c4af8d9184619a3de65bc378ePaul Walmsley * Copyright (C) 2011 Nokia Corporation 6657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * 7657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * Ranjith Lohithakshan 8657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * Paul Walmsley 9657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * 10657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * Parts of this code are based on code written by 11657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu, 12657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * Russell King 13657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * 14657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * This program is free software; you can redistribute it and/or modify 15657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * it under the terms of the GNU General Public License version 2 as 16657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * published by the Free Software Foundation. 17657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley */ 18657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley#undef DEBUG 19657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley 20657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley#include <linux/kernel.h> 21657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley#include <linux/clk.h> 22657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley#include <linux/io.h> 23657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley 24657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley#include "clock.h" 25657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley#include "clock3517.h" 26ff4ae5d9319b86f940e410e92659c50f9879ff46Paul Walmsley#include "cm3xxx.h" 27657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley#include "cm-regbits-34xx.h" 28657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley 29657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley/* 30657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * In AM35xx IPSS, the {ICK,FCK} enable bits for modules are exported 31657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * in the same register at a bit offset of 0x8. The EN_ACK for ICK is 32657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * at an offset of 4 from ICK enable bit. 33657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley */ 34657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley#define AM35XX_IPSS_ICK_MASK 0xF 35657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley#define AM35XX_IPSS_ICK_EN_ACK_OFFSET 0x4 36657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley#define AM35XX_IPSS_ICK_FCK_OFFSET 0x8 37657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley#define AM35XX_IPSS_CLK_IDLEST_VAL 0 38657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley 39657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley/** 40657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * am35xx_clk_find_idlest - return clock ACK info for AM35XX IPSS 41657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * @clk: struct clk * being enabled 42657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into 43657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into 44657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator 45657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * 46657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * The interface clocks on AM35xx IPSS reflects the clock idle status 47657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * in the enable register itsel at a bit offset of 4 from the enable 48657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * bit. A value of 1 indicates that clock is enabled. 49657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley */ 50b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayakstatic void am35xx_clk_find_idlest(struct clk_hw_omap *clk, 51657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley void __iomem **idlest_reg, 52657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley u8 *idlest_bit, 53657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley u8 *idlest_val) 54657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley{ 55657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley *idlest_reg = (__force void __iomem *)(clk->enable_reg); 56657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley *idlest_bit = clk->enable_bit + AM35XX_IPSS_ICK_EN_ACK_OFFSET; 57657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley *idlest_val = AM35XX_IPSS_CLK_IDLEST_VAL; 58657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley} 59657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley 60657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley/** 61657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * am35xx_clk_find_companion - find companion clock to @clk 62657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * @clk: struct clk * to find the companion clock of 63657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in 64657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * @other_bit: u8 ** to return the companion clock bit shift in 65657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * 66657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * Some clocks don't have companion clocks. For example, modules with 67657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * only an interface clock (such as HECC) don't have a companion 68657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * clock. Right now, this code relies on the hardware exporting a bit 69657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * in the correct companion register that indicates that the 70657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * nonexistent 'companion clock' is active. Future patches will 71657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * associate this type of code with per-module data structures to 72657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * avoid this issue, and remove the casts. No return value. 73657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley */ 74b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayakstatic void am35xx_clk_find_companion(struct clk_hw_omap *clk, 75b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayak void __iomem **other_reg, 76b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayak u8 *other_bit) 77657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley{ 78657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley *other_reg = (__force void __iomem *)(clk->enable_reg); 79657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley if (clk->enable_bit & AM35XX_IPSS_ICK_MASK) 80657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley *other_bit = clk->enable_bit + AM35XX_IPSS_ICK_FCK_OFFSET; 81657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley else 82657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley *other_bit = clk->enable_bit - AM35XX_IPSS_ICK_FCK_OFFSET; 83657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley} 84b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayakconst struct clk_hw_omap_ops clkhwops_am35xx_ipss_module_wait = { 85b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayak .find_idlest = am35xx_clk_find_idlest, 86b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayak .find_companion = am35xx_clk_find_companion, 87b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayak}; 88657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley 89657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley/** 90657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * am35xx_clk_ipss_find_idlest - return CM_IDLEST info for IPSS 91657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * @clk: struct clk * being enabled 92657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into 93657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into 94657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator 95657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * 96657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * The IPSS target CM_IDLEST bit is at a different shift from the 97657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * CM_{I,F}CLKEN bit. Pass back the correct info via @idlest_reg 98657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley * and @idlest_bit. No return value. 99657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley */ 100b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayakstatic void am35xx_clk_ipss_find_idlest(struct clk_hw_omap *clk, 101657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley void __iomem **idlest_reg, 102657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley u8 *idlest_bit, 103657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley u8 *idlest_val) 104657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley{ 105657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley u32 r; 106657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley 107657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20); 108657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley *idlest_reg = (__force void __iomem *)r; 109657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley *idlest_bit = AM35XX_ST_IPSS_SHIFT; 110657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley *idlest_val = OMAP34XX_CM_IDLEST_VAL; 111657ebfadc19c5a14f709dee1645082828330d5d4Paul Walmsley} 11225f4214e388dda818765b670fb608f2e6467d877Rajendra Nayak 113b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayakconst struct clk_hw_omap_ops clkhwops_am35xx_ipss_wait = { 114b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayak .allow_idle = omap2_clkt_iclk_allow_idle, 115b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayak .deny_idle = omap2_clkt_iclk_deny_idle, 116b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayak .find_idlest = am35xx_clk_ipss_find_idlest, 117b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayak .find_companion = omap2_clk_dflt_find_companion, 118b4777a21381fd1f87be8c606a616b7f97f485d2bRajendra Nayak}; 119