1ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* n2-drv.c: Niagara-2 RNG driver. 2ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 324f146696184cbe4b440179064a45dfddaad4cc4David S. Miller * Copyright (C) 2008, 2011 David S. Miller <davem@davemloft.net> 4ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 5ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 6ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/kernel.h> 7ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/module.h> 8ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/types.h> 9ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/delay.h> 10ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/slab.h> 11ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/workqueue.h> 12ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/preempt.h> 13ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/hw_random.h> 14ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 15ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/of.h> 16ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/of_device.h> 17ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 18ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <asm/hypervisor.h> 19ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 20ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include "n2rng.h" 21ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 22ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define DRV_MODULE_NAME "n2rng" 23ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define PFX DRV_MODULE_NAME ": " 2424f146696184cbe4b440179064a45dfddaad4cc4David S. Miller#define DRV_MODULE_VERSION "0.2" 2524f146696184cbe4b440179064a45dfddaad4cc4David S. Miller#define DRV_MODULE_RELDATE "July 27, 2011" 26ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 270bbed20e0518f6b9d46b7fe2bd044e3398a6dc40Bill Pembertonstatic char version[] = 28ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 29ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 30ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. MillerMODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); 31ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. MillerMODULE_DESCRIPTION("Niagara2 RNG driver"); 32ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. MillerMODULE_LICENSE("GPL"); 33ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. MillerMODULE_VERSION(DRV_MODULE_VERSION); 34ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 35ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* The Niagara2 RNG provides a 64-bit read-only random number 36ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * register, plus a control register. Access to the RNG is 37ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * virtualized through the hypervisor so that both guests and control 38ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * nodes can access the device. 39ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 40ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * The entropy source consists of raw entropy sources, each 41ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * constructed from a voltage controlled oscillator whose phase is 42ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * jittered by thermal noise sources. 43ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 44ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * The oscillator in each of the three raw entropy sources run at 45ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * different frequencies. Normally, all three generator outputs are 46ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * gathered, xored together, and fed into a CRC circuit, the output of 47ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * which is the 64-bit read-only register. 48ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 49ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * Some time is necessary for all the necessary entropy to build up 50ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * such that a full 64-bits of entropy are available in the register. 51ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * In normal operating mode (RNG_CTL_LFSR is set), the chip implements 52ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * an interlock which blocks register reads until sufficient entropy 53ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * is available. 54ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 55ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * A control register is provided for adjusting various aspects of RNG 56ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * operation, and to enable diagnostic modes. Each of the three raw 57ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * entropy sources has an enable bit (RNG_CTL_ES{1,2,3}). Also 58ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * provided are fields for controlling the minimum time in cycles 59ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * between read accesses to the register (RNG_CTL_WAIT, this controls 60ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * the interlock described in the previous paragraph). 61ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 62ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * The standard setting is to have the mode bit (RNG_CTL_LFSR) set, 63ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * all three entropy sources enabled, and the interlock time set 64ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * appropriately. 65ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 66ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * The CRC polynomial used by the chip is: 67ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 68ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * P(X) = x64 + x61 + x57 + x56 + x52 + x51 + x50 + x48 + x47 + x46 + 69ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * x43 + x42 + x41 + x39 + x38 + x37 + x35 + x32 + x28 + x25 + 70ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * x22 + x21 + x17 + x15 + x13 + x12 + x11 + x7 + x5 + x + 1 71ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 72ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * The RNG_CTL_VCO value of each noise cell must be programmed 733ad2f3fbb961429d2aa627465ae4829758bc7e07Daniel Mack * separately. This is why 4 control register values must be provided 74ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * to the hypervisor. During a write, the hypervisor writes them all, 75ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * one at a time, to the actual RNG_CTL register. The first three 76ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * values are used to setup the desired RNG_CTL_VCO for each entropy 77ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * source, for example: 78ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 79ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * control 0: (1 << RNG_CTL_VCO_SHIFT) | RNG_CTL_ES1 80ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * control 1: (2 << RNG_CTL_VCO_SHIFT) | RNG_CTL_ES2 81ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * control 2: (3 << RNG_CTL_VCO_SHIFT) | RNG_CTL_ES3 82ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 83ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * And then the fourth value sets the final chip state and enables 84ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * desired. 85ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 86ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 87ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_hv_err_trans(unsigned long hv_err) 88ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 89ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller switch (hv_err) { 90ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EOK: 91ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 92ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EWOULDBLOCK: 93ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EAGAIN; 94ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_ENOACCESS: 95ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EPERM; 96ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EIO: 97ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EIO; 98ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EBUSY: 99ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EBUSY; 100ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EBADALIGN: 101ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_ENORADDR: 102ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EFAULT; 103ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller default: 104ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EINVAL; 105ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 106ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 107ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 108ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic unsigned long n2rng_generic_read_control_v2(unsigned long ra, 109ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long unit) 110ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 111ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long hv_err, state, ticks, watchdog_delta, watchdog_status; 112ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int block = 0, busy = 0; 113ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 114ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller while (1) { 115ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_ctl_read_v2(ra, unit, &state, 116ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &ticks, 117ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &watchdog_delta, 118ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &watchdog_status); 119ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EOK) 120ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 121ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 122ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EBUSY) { 123ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++busy >= N2RNG_BUSY_LIMIT) 124ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 125ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 126ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller udelay(1); 127ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_EWOULDBLOCK) { 128ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++block >= N2RNG_BLOCK_LIMIT) 129ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 130ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 131ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller __delay(ticks); 132ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 133ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 134ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 135ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 136ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return hv_err; 137ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 138ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 139ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* In multi-socket situations, the hypervisor might need to 140ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * queue up the RNG control register write if it's for a unit 141ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * that is on a cpu socket other than the one we are executing on. 142ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 143ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * We poll here waiting for a successful read of that control 144ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * register to make sure the write has been actually performed. 145ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 146ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic unsigned long n2rng_control_settle_v2(struct n2rng *np, int unit) 147ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 148ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ra = __pa(&np->scratch_control[0]); 149ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 150ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return n2rng_generic_read_control_v2(ra, unit); 151ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 152ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 153ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic unsigned long n2rng_write_ctl_one(struct n2rng *np, int unit, 154ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long state, 155ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long control_ra, 156ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long watchdog_timeout, 157ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long *ticks) 158ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 159ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long hv_err; 160ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 161ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (np->hvapi_major == 1) { 162ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_ctl_write_v1(control_ra, state, 163ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller watchdog_timeout, ticks); 164ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 165ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_ctl_write_v2(control_ra, state, 166ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller watchdog_timeout, unit); 167ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EOK) 168ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = n2rng_control_settle_v2(np, unit); 169ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller *ticks = N2RNG_ACCUM_CYCLES_DEFAULT; 170ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 171ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 172ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return hv_err; 173ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 174ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 175ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_generic_read_data(unsigned long data_ra) 176ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 177ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ticks, hv_err; 178ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int block = 0, hcheck = 0; 179ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 180ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller while (1) { 181ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_data_read(data_ra, &ticks); 182ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EOK) 183ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 184ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 185ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EWOULDBLOCK) { 186ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++block >= N2RNG_BLOCK_LIMIT) 187ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EWOULDBLOCK; 188ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller __delay(ticks); 189ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_ENOACCESS) { 190ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EPERM; 191ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_EIO) { 192ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++hcheck >= N2RNG_HCHECK_LIMIT) 193ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EIO; 194ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller udelay(10000); 195ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 196ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -ENODEV; 197ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 198ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 199ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 200ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic unsigned long n2rng_read_diag_data_one(struct n2rng *np, 201ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long unit, 202ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long data_ra, 203ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long data_len, 204ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long *ticks) 205ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 206ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long hv_err; 207ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 208ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (np->hvapi_major == 1) { 209ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_data_read_diag_v1(data_ra, data_len, ticks); 210ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 211ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_data_read_diag_v2(data_ra, data_len, 212ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unit, ticks); 213ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!*ticks) 214ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller *ticks = N2RNG_ACCUM_CYCLES_DEFAULT; 215ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 216ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return hv_err; 217ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 218ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 219ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_generic_read_diag_data(struct n2rng *np, 220ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long unit, 221ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long data_ra, 222ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long data_len) 223ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 224ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ticks, hv_err; 225ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int block = 0; 226ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 227ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller while (1) { 228ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = n2rng_read_diag_data_one(np, unit, 229ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller data_ra, data_len, 230ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &ticks); 231ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EOK) 232ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 233ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 234ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EWOULDBLOCK) { 235ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++block >= N2RNG_BLOCK_LIMIT) 236ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EWOULDBLOCK; 237ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller __delay(ticks); 238ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_ENOACCESS) { 239ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EPERM; 240ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_EIO) { 241ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EIO; 242ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 243ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -ENODEV; 244ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 245ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 246ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 247ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 248ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_generic_write_control(struct n2rng *np, 249ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long control_ra, 250ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long unit, 251ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long state) 252ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 253ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long hv_err, ticks; 254ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int block = 0, busy = 0; 255ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 256ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller while (1) { 257ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = n2rng_write_ctl_one(np, unit, state, control_ra, 258ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->wd_timeo, &ticks); 259ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EOK) 260ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 261ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 262ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EWOULDBLOCK) { 263ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++block >= N2RNG_BLOCK_LIMIT) 264ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EWOULDBLOCK; 265ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller __delay(ticks); 266ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_EBUSY) { 267ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++busy >= N2RNG_BUSY_LIMIT) 268ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EBUSY; 269ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller udelay(1); 270ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 271ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -ENODEV; 272ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 273ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 274ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 275ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* Just try to see if we can successfully access the control register 276ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * of the RNG on the domain on which we are currently executing. 277ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 278ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_try_read_ctl(struct n2rng *np) 279ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 280ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long hv_err; 281ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long x; 282ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 283ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (np->hvapi_major == 1) { 284ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_get_diag_ctl(); 285ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 286ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller /* We purposefully give invalid arguments, HV_NOACCESS 287ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * is higher priority than the errors we'd get from 288ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * these other cases, and that's the error we are 289ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * truly interested in. 290ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 291ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_ctl_read_v2(0UL, ~0UL, &x, &x, &x, &x); 292ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller switch (hv_err) { 293ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EWOULDBLOCK: 294ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_ENOACCESS: 295ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 296ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller default: 297ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = HV_EOK; 298ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 299ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 300ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 301ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 302ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return n2rng_hv_err_trans(hv_err); 303ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 304ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 305ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define CONTROL_DEFAULT_BASE \ 306ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller ((2 << RNG_CTL_ASEL_SHIFT) | \ 307ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (N2RNG_ACCUM_CYCLES_DEFAULT << RNG_CTL_WAIT_SHIFT) | \ 308ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_LFSR) 309ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 310ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define CONTROL_DEFAULT_0 \ 311ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (CONTROL_DEFAULT_BASE | \ 312ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (1 << RNG_CTL_VCO_SHIFT) | \ 313ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_ES1) 314ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define CONTROL_DEFAULT_1 \ 315ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (CONTROL_DEFAULT_BASE | \ 316ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (2 << RNG_CTL_VCO_SHIFT) | \ 317ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_ES2) 318ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define CONTROL_DEFAULT_2 \ 319ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (CONTROL_DEFAULT_BASE | \ 320ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (3 << RNG_CTL_VCO_SHIFT) | \ 321ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_ES3) 322ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define CONTROL_DEFAULT_3 \ 323ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (CONTROL_DEFAULT_BASE | \ 324ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_ES1 | RNG_CTL_ES2 | RNG_CTL_ES3) 325ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 326ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic void n2rng_control_swstate_init(struct n2rng *np) 327ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 328ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i; 329ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 330ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->flags |= N2RNG_FLAG_CONTROL; 331ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 332ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->health_check_sec = N2RNG_HEALTH_CHECK_SEC_DEFAULT; 333ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->accum_cycles = N2RNG_ACCUM_CYCLES_DEFAULT; 334ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->wd_timeo = N2RNG_WD_TIMEO_DEFAULT; 335ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 336ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 0; i < np->num_units; i++) { 337ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller struct n2rng_unit *up = &np->units[i]; 338ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 339ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[0] = CONTROL_DEFAULT_0; 340ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[1] = CONTROL_DEFAULT_1; 341ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[2] = CONTROL_DEFAULT_2; 342ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[3] = CONTROL_DEFAULT_3; 343ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 344ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 345ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hv_state = HV_RNG_STATE_UNCONFIGURED; 346ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 347ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 348ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_grab_diag_control(struct n2rng *np) 349ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 350ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i, busy_count, err = -ENODEV; 351ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 352ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller busy_count = 0; 353ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 0; i < 100; i++) { 354ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_try_read_ctl(np); 355ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err != -EAGAIN) 356ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 357ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 358ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++busy_count > 100) { 359ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_err(&np->op->dev, 360ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller "Grab diag control timeout.\n"); 361ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -ENODEV; 362ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 363ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 364ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller udelay(1); 365ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 366ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 367ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 368ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 369ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 370ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_init_control(struct n2rng *np) 371ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 372ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err = n2rng_grab_diag_control(np); 373ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 374ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller /* Not in the control domain, that's OK we are only a consumer 375ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * of the RNG data, we don't setup and program it. 376ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 377ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err == -EPERM) 378ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 379ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 380ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 381ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 382ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller n2rng_control_swstate_init(np); 383ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 384ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 385ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 386ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 387ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_data_read(struct hwrng *rng, u32 *data) 388ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 38950b6e71ae83714be509b80727dbf90fa8b1c0717Herbert Xu struct n2rng *np = (struct n2rng *) rng->priv; 390ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ra = __pa(&np->test_data); 391ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int len; 392ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 393ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!(np->flags & N2RNG_FLAG_READY)) { 394ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller len = 0; 395ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (np->flags & N2RNG_FLAG_BUFFER_VALID) { 396ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->flags &= ~N2RNG_FLAG_BUFFER_VALID; 397ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller *data = np->buffer; 398ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller len = 4; 399ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 400ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err = n2rng_generic_read_data(ra); 401ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!err) { 402ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->buffer = np->test_data >> 32; 403ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller *data = np->test_data & 0xffffffff; 404ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller len = 4; 405ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 406ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_err(&np->op->dev, "RNG error, restesting\n"); 407ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->flags &= ~N2RNG_FLAG_READY; 408ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!(np->flags & N2RNG_FLAG_SHUTDOWN)) 409ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller schedule_delayed_work(&np->work, 0); 410ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller len = 0; 411ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 412ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 413ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 414ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return len; 415ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 416ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 417ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* On a guest node, just make sure we can read random data properly. 418ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * If a control node reboots or reloads it's n2rng driver, this won't 419ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * work during that time. So we have to keep probing until the device 420ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * becomes usable. 421ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 422ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_guest_check(struct n2rng *np) 423ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 424ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ra = __pa(&np->test_data); 425ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 426ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return n2rng_generic_read_data(ra); 427ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 428ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 429ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_entropy_diag_read(struct n2rng *np, unsigned long unit, 430ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller u64 *pre_control, u64 pre_state, 431ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller u64 *buffer, unsigned long buf_len, 432ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller u64 *post_control, u64 post_state) 433ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 434ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long post_ctl_ra = __pa(post_control); 435ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long pre_ctl_ra = __pa(pre_control); 436ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long buffer_ra = __pa(buffer); 437ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err; 438ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 439ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_generic_write_control(np, pre_ctl_ra, unit, pre_state); 440ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 441ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 442ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 443ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_generic_read_diag_data(np, unit, 444ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller buffer_ra, buf_len); 445ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 446ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (void) n2rng_generic_write_control(np, post_ctl_ra, unit, 447ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller post_state); 448ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 449ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 450ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 451ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 452ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic u64 advance_polynomial(u64 poly, u64 val, int count) 453ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 454ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i; 455ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 456ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 0; i < count; i++) { 457ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int highbit_set = ((s64)val < 0); 458ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 459ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller val <<= 1; 460ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (highbit_set) 461ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller val ^= poly; 462ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 463ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 464ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return val; 465ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 466ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 467ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_test_buffer_find(struct n2rng *np, u64 val) 468ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 469ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i, count = 0; 470ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 471ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller /* Purposefully skip over the first word. */ 472ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 1; i < SELFTEST_BUFFER_WORDS; i++) { 473ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (np->test_buffer[i] == val) 474ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller count++; 475ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 476ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return count; 477ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 478ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 479ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic void n2rng_dump_test_buffer(struct n2rng *np) 480ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 481ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i; 482ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 483ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 0; i < SELFTEST_BUFFER_WORDS; i++) 4843f4528d6e91cffde49894f5252e6657d420d3d74Sam Ravnborg dev_err(&np->op->dev, "Test buffer slot %d [0x%016llx]\n", 485ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller i, np->test_buffer[i]); 486ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 487ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 488ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_check_selftest_buffer(struct n2rng *np, unsigned long unit) 489ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 490ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller u64 val = SELFTEST_VAL; 491ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err, matches, limit; 492ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 493ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller matches = 0; 494ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (limit = 0; limit < SELFTEST_LOOPS_MAX; limit++) { 495ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller matches += n2rng_test_buffer_find(np, val); 496ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (matches >= SELFTEST_MATCH_GOAL) 497ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 498ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller val = advance_polynomial(SELFTEST_POLY, val, 1); 499ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 500ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 501ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = 0; 502ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (limit >= SELFTEST_LOOPS_MAX) { 503ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = -ENODEV; 504ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_err(&np->op->dev, "Selftest failed on unit %lu\n", unit); 505ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller n2rng_dump_test_buffer(np); 506ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 507ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_info(&np->op->dev, "Selftest passed on unit %lu\n", unit); 508ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 509ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 510ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 511ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 512ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_control_selftest(struct n2rng *np, unsigned long unit) 513ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 514ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err; 515ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 516ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->test_control[0] = (0x2 << RNG_CTL_ASEL_SHIFT); 517ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->test_control[1] = (0x2 << RNG_CTL_ASEL_SHIFT); 518ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->test_control[2] = (0x2 << RNG_CTL_ASEL_SHIFT); 519ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->test_control[3] = ((0x2 << RNG_CTL_ASEL_SHIFT) | 520ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_LFSR | 521ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller ((SELFTEST_TICKS - 2) << RNG_CTL_WAIT_SHIFT)); 522ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 523ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 524ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_entropy_diag_read(np, unit, np->test_control, 525ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller HV_RNG_STATE_HEALTHCHECK, 526ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->test_buffer, 527ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller sizeof(np->test_buffer), 528ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &np->units[unit].control[0], 529ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hv_state); 530ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 531ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 532ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 533ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return n2rng_check_selftest_buffer(np, unit); 534ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 535ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 536ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_control_check(struct n2rng *np) 537ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 538ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i; 539ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 540ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 0; i < np->num_units; i++) { 541ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err = n2rng_control_selftest(np, i); 542ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 543ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 544ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 545ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 546ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 547ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 548ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* The sanity checks passed, install the final configuration into the 549ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * chip, it's ready to use. 550ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 551ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_control_configure_units(struct n2rng *np) 552ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 553ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int unit, err; 554ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 555ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = 0; 556ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (unit = 0; unit < np->num_units; unit++) { 557ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller struct n2rng_unit *up = &np->units[unit]; 558ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ctl_ra = __pa(&up->control[0]); 559ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int esrc; 560ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller u64 base; 561ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 562ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller base = ((np->accum_cycles << RNG_CTL_WAIT_SHIFT) | 563ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (2 << RNG_CTL_ASEL_SHIFT) | 564ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_LFSR); 565ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 566ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller /* XXX This isn't the best. We should fetch a bunch 567ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * XXX of words using each entropy source combined XXX 568ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * with each VCO setting, and see which combinations 569ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * XXX give the best random data. 570ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 571ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (esrc = 0; esrc < 3; esrc++) 572ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[esrc] = base | 573ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (esrc << RNG_CTL_VCO_SHIFT) | 574ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (RNG_CTL_ES1 << esrc); 575ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 576ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[3] = base | 577ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (RNG_CTL_ES1 | RNG_CTL_ES2 | RNG_CTL_ES3); 578ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 579ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_generic_write_control(np, ctl_ra, unit, 580ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller HV_RNG_STATE_CONFIGURED); 581ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 582ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 583ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 584ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 585ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 586ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 587ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 588ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic void n2rng_work(struct work_struct *work) 589ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 590ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller struct n2rng *np = container_of(work, struct n2rng, work.work); 591ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err = 0; 592ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 593ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!(np->flags & N2RNG_FLAG_CONTROL)) { 594ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_guest_check(np); 595ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 596ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller preempt_disable(); 597ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_control_check(np); 598ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller preempt_enable(); 599ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 600ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!err) 601ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_control_configure_units(np); 602ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 603ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 604ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!err) { 605ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->flags |= N2RNG_FLAG_READY; 606ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_info(&np->op->dev, "RNG ready\n"); 607ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 608ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 609ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err && !(np->flags & N2RNG_FLAG_SHUTDOWN)) 610ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller schedule_delayed_work(&np->work, HZ * 2); 611ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 612ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 613bcd2982a0e2af8d0506271b439af4b568fc33fdcGreg Kroah-Hartmanstatic void n2rng_driver_version(void) 614ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 615ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller static int n2rng_version_printed; 616ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 617ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (n2rng_version_printed++ == 0) 618ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller pr_info("%s", version); 619ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 620ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 621b1608d69cb804e414d0887140ba08a9398e4e638Grant Likelystatic const struct of_device_id n2rng_match[]; 622bcd2982a0e2af8d0506271b439af4b568fc33fdcGreg Kroah-Hartmanstatic int n2rng_probe(struct platform_device *op) 623ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 624b1608d69cb804e414d0887140ba08a9398e4e638Grant Likely const struct of_device_id *match; 62524f146696184cbe4b440179064a45dfddaad4cc4David S. Miller int multi_capable; 626ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err = -ENOMEM; 627ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller struct n2rng *np; 628ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 629b1608d69cb804e414d0887140ba08a9398e4e638Grant Likely match = of_match_device(n2rng_match, &op->dev); 630b1608d69cb804e414d0887140ba08a9398e4e638Grant Likely if (!match) 6314ebb24f707187196937607c60810d42f7112d7aaGrant Likely return -EINVAL; 63224f146696184cbe4b440179064a45dfddaad4cc4David S. Miller multi_capable = (match->data != NULL); 633ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 6344ebb24f707187196937607c60810d42f7112d7aaGrant Likely n2rng_driver_version(); 6350118a552137506a68ac062981967d8b5147e6028Himangi Saraogi np = devm_kzalloc(&op->dev, sizeof(*np), GFP_KERNEL); 636ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!np) 637ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller goto out; 638ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->op = op; 639ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 640ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller INIT_DELAYED_WORK(&np->work, n2rng_work); 641ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 64224f146696184cbe4b440179064a45dfddaad4cc4David S. Miller if (multi_capable) 64324f146696184cbe4b440179064a45dfddaad4cc4David S. Miller np->flags |= N2RNG_FLAG_MULTI; 644ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 645ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = -ENODEV; 646ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hvapi_major = 2; 647ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (sun4v_hvapi_register(HV_GRP_RNG, 648ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hvapi_major, 649ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &np->hvapi_minor)) { 650ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hvapi_major = 1; 651ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (sun4v_hvapi_register(HV_GRP_RNG, 652ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hvapi_major, 653ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &np->hvapi_minor)) { 654ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_err(&op->dev, "Cannot register suitable " 655ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller "HVAPI version.\n"); 6560118a552137506a68ac062981967d8b5147e6028Himangi Saraogi goto out; 657ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 658ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 659ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 66024f146696184cbe4b440179064a45dfddaad4cc4David S. Miller if (np->flags & N2RNG_FLAG_MULTI) { 661ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (np->hvapi_major < 2) { 66224f146696184cbe4b440179064a45dfddaad4cc4David S. Miller dev_err(&op->dev, "multi-unit-capable RNG requires " 66324f146696184cbe4b440179064a45dfddaad4cc4David S. Miller "HVAPI major version 2 or later, got %lu\n", 664ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hvapi_major); 665ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller goto out_hvapi_unregister; 666ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 66761c7a080a5a061c976988fd4b844dfb468dda255Grant Likely np->num_units = of_getintprop_default(op->dev.of_node, 668ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller "rng-#units", 0); 669ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!np->num_units) { 670ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_err(&op->dev, "VF RNG lacks rng-#units property\n"); 671ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller goto out_hvapi_unregister; 672ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 673ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 674ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->num_units = 1; 675ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 676ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_info(&op->dev, "Registered RNG HVAPI major %lu minor %lu\n", 677ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hvapi_major, np->hvapi_minor); 678ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 6790118a552137506a68ac062981967d8b5147e6028Himangi Saraogi np->units = devm_kzalloc(&op->dev, 6800118a552137506a68ac062981967d8b5147e6028Himangi Saraogi sizeof(struct n2rng_unit) * np->num_units, 6810118a552137506a68ac062981967d8b5147e6028Himangi Saraogi GFP_KERNEL); 682ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = -ENOMEM; 683ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!np->units) 684ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller goto out_hvapi_unregister; 685ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 686ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_init_control(np); 687ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 6880118a552137506a68ac062981967d8b5147e6028Himangi Saraogi goto out_hvapi_unregister; 689ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 690ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_info(&op->dev, "Found %s RNG, units: %d\n", 69124f146696184cbe4b440179064a45dfddaad4cc4David S. Miller ((np->flags & N2RNG_FLAG_MULTI) ? 69224f146696184cbe4b440179064a45dfddaad4cc4David S. Miller "multi-unit-capable" : "single-unit"), 693ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->num_units); 694ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 695ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hwrng.name = "n2rng"; 696ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hwrng.data_read = n2rng_data_read; 697ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hwrng.priv = (unsigned long) np; 698ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 699ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = hwrng_register(&np->hwrng); 700ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 7010118a552137506a68ac062981967d8b5147e6028Himangi Saraogi goto out_hvapi_unregister; 702ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 7031f539bcb13120213f266d5506fe7339bc78bd953Jingoo Han platform_set_drvdata(op, np); 704ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 705ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller schedule_delayed_work(&np->work, 0); 706ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 707ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 708ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 709ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerout_hvapi_unregister: 710ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller sun4v_hvapi_unregister(HV_GRP_RNG); 711ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 712ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerout: 713ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 714ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 715ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 71639af33fc458543fd6daaf154e109eba22ab89a8fBill Pembertonstatic int n2rng_remove(struct platform_device *op) 717ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 7181f539bcb13120213f266d5506fe7339bc78bd953Jingoo Han struct n2rng *np = platform_get_drvdata(op); 719ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 720ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->flags |= N2RNG_FLAG_SHUTDOWN; 721ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 722ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller cancel_delayed_work_sync(&np->work); 723ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 724ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hwrng_unregister(&np->hwrng); 725ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 726ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller sun4v_hvapi_unregister(HV_GRP_RNG); 727ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 728ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 729ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 730ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 731fd098316ef533e8441576f020ead4beab93154ceDavid S. Millerstatic const struct of_device_id n2rng_match[] = { 732ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller { 733ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .name = "random-number-generator", 734ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .compatible = "SUNW,n2-rng", 735ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller }, 736ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller { 737ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .name = "random-number-generator", 738ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .compatible = "SUNW,vf-rng", 739ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .data = (void *) 1, 740ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller }, 74124f146696184cbe4b440179064a45dfddaad4cc4David S. Miller { 74224f146696184cbe4b440179064a45dfddaad4cc4David S. Miller .name = "random-number-generator", 74324f146696184cbe4b440179064a45dfddaad4cc4David S. Miller .compatible = "SUNW,kt-rng", 74424f146696184cbe4b440179064a45dfddaad4cc4David S. Miller .data = (void *) 1, 74524f146696184cbe4b440179064a45dfddaad4cc4David S. Miller }, 746ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller {}, 747ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller}; 748ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. MillerMODULE_DEVICE_TABLE(of, n2rng_match); 749ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 7504ebb24f707187196937607c60810d42f7112d7aaGrant Likelystatic struct platform_driver n2rng_driver = { 7514018294b53d1dae026880e45f174c1cc63b5d435Grant Likely .driver = { 7524018294b53d1dae026880e45f174c1cc63b5d435Grant Likely .name = "n2rng", 7534018294b53d1dae026880e45f174c1cc63b5d435Grant Likely .owner = THIS_MODULE, 7544018294b53d1dae026880e45f174c1cc63b5d435Grant Likely .of_match_table = n2rng_match, 7554018294b53d1dae026880e45f174c1cc63b5d435Grant Likely }, 756ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .probe = n2rng_probe, 757bcd2982a0e2af8d0506271b439af4b568fc33fdcGreg Kroah-Hartman .remove = n2rng_remove, 758ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller}; 759ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 760b21cb324f141d16833137ef0355f686efb9bd84fAxel Linmodule_platform_driver(n2rng_driver); 761