n2-drv.c revision 3f4528d6e91cffde49894f5252e6657d420d3d74
1ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* n2-drv.c: Niagara-2 RNG driver. 2ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 3ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * Copyright (C) 2008 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/init.h> 11ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/slab.h> 12ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/workqueue.h> 13ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/preempt.h> 14ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/hw_random.h> 15ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 16ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/of.h> 17ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <linux/of_device.h> 18ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 19ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include <asm/hypervisor.h> 20ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 21ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#include "n2rng.h" 22ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 23ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define DRV_MODULE_NAME "n2rng" 24ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define PFX DRV_MODULE_NAME ": " 25ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define DRV_MODULE_VERSION "0.1" 26ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define DRV_MODULE_RELDATE "May 15, 2008" 27ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 28ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic char version[] __devinitdata = 29ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 30ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 31ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. MillerMODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); 32ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. MillerMODULE_DESCRIPTION("Niagara2 RNG driver"); 33ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. MillerMODULE_LICENSE("GPL"); 34ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. MillerMODULE_VERSION(DRV_MODULE_VERSION); 35ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 36ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* The Niagara2 RNG provides a 64-bit read-only random number 37ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * register, plus a control register. Access to the RNG is 38ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * virtualized through the hypervisor so that both guests and control 39ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * nodes can access the device. 40ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 41ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * The entropy source consists of raw entropy sources, each 42ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * constructed from a voltage controlled oscillator whose phase is 43ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * jittered by thermal noise sources. 44ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 45ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * The oscillator in each of the three raw entropy sources run at 46ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * different frequencies. Normally, all three generator outputs are 47ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * gathered, xored together, and fed into a CRC circuit, the output of 48ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * which is the 64-bit read-only register. 49ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 50ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * Some time is necessary for all the necessary entropy to build up 51ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * such that a full 64-bits of entropy are available in the register. 52ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * In normal operating mode (RNG_CTL_LFSR is set), the chip implements 53ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * an interlock which blocks register reads until sufficient entropy 54ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * is available. 55ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 56ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * A control register is provided for adjusting various aspects of RNG 57ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * operation, and to enable diagnostic modes. Each of the three raw 58ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * entropy sources has an enable bit (RNG_CTL_ES{1,2,3}). Also 59ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * provided are fields for controlling the minimum time in cycles 60ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * between read accesses to the register (RNG_CTL_WAIT, this controls 61ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * the interlock described in the previous paragraph). 62ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 63ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * The standard setting is to have the mode bit (RNG_CTL_LFSR) set, 64ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * all three entropy sources enabled, and the interlock time set 65ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * appropriately. 66ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 67ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * The CRC polynomial used by the chip is: 68ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 69ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * P(X) = x64 + x61 + x57 + x56 + x52 + x51 + x50 + x48 + x47 + x46 + 70ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * x43 + x42 + x41 + x39 + x38 + x37 + x35 + x32 + x28 + x25 + 71ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * x22 + x21 + x17 + x15 + x13 + x12 + x11 + x7 + x5 + x + 1 72ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 73ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * The RNG_CTL_VCO value of each noise cell must be programmed 74ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * seperately. This is why 4 control register values must be provided 75ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * to the hypervisor. During a write, the hypervisor writes them all, 76ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * one at a time, to the actual RNG_CTL register. The first three 77ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * values are used to setup the desired RNG_CTL_VCO for each entropy 78ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * source, for example: 79ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 80ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * control 0: (1 << RNG_CTL_VCO_SHIFT) | RNG_CTL_ES1 81ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * control 1: (2 << RNG_CTL_VCO_SHIFT) | RNG_CTL_ES2 82ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * control 2: (3 << RNG_CTL_VCO_SHIFT) | RNG_CTL_ES3 83ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 84ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * And then the fourth value sets the final chip state and enables 85ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * desired. 86ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 87ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 88ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_hv_err_trans(unsigned long hv_err) 89ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 90ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller switch (hv_err) { 91ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EOK: 92ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 93ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EWOULDBLOCK: 94ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EAGAIN; 95ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_ENOACCESS: 96ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EPERM; 97ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EIO: 98ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EIO; 99ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EBUSY: 100ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EBUSY; 101ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EBADALIGN: 102ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_ENORADDR: 103ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EFAULT; 104ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller default: 105ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EINVAL; 106ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 107ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 108ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 109ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic unsigned long n2rng_generic_read_control_v2(unsigned long ra, 110ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long unit) 111ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 112ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long hv_err, state, ticks, watchdog_delta, watchdog_status; 113ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int block = 0, busy = 0; 114ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 115ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller while (1) { 116ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_ctl_read_v2(ra, unit, &state, 117ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &ticks, 118ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &watchdog_delta, 119ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &watchdog_status); 120ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EOK) 121ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 122ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 123ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EBUSY) { 124ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++busy >= N2RNG_BUSY_LIMIT) 125ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 126ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 127ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller udelay(1); 128ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_EWOULDBLOCK) { 129ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++block >= N2RNG_BLOCK_LIMIT) 130ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 131ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 132ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller __delay(ticks); 133ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 134ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 135ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 136ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 137ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return hv_err; 138ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 139ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 140ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* In multi-socket situations, the hypervisor might need to 141ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * queue up the RNG control register write if it's for a unit 142ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * that is on a cpu socket other than the one we are executing on. 143ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * 144ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * We poll here waiting for a successful read of that control 145ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * register to make sure the write has been actually performed. 146ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 147ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic unsigned long n2rng_control_settle_v2(struct n2rng *np, int unit) 148ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 149ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ra = __pa(&np->scratch_control[0]); 150ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 151ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return n2rng_generic_read_control_v2(ra, unit); 152ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 153ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 154ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic unsigned long n2rng_write_ctl_one(struct n2rng *np, int unit, 155ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long state, 156ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long control_ra, 157ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long watchdog_timeout, 158ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long *ticks) 159ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 160ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long hv_err; 161ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 162ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (np->hvapi_major == 1) { 163ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_ctl_write_v1(control_ra, state, 164ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller watchdog_timeout, ticks); 165ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 166ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_ctl_write_v2(control_ra, state, 167ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller watchdog_timeout, unit); 168ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EOK) 169ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = n2rng_control_settle_v2(np, unit); 170ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller *ticks = N2RNG_ACCUM_CYCLES_DEFAULT; 171ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 172ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 173ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return hv_err; 174ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 175ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 176ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_generic_read_data(unsigned long data_ra) 177ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 178ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ticks, hv_err; 179ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int block = 0, hcheck = 0; 180ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 181ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller while (1) { 182ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_data_read(data_ra, &ticks); 183ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EOK) 184ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 185ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 186ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EWOULDBLOCK) { 187ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++block >= N2RNG_BLOCK_LIMIT) 188ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EWOULDBLOCK; 189ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller __delay(ticks); 190ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_ENOACCESS) { 191ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EPERM; 192ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_EIO) { 193ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++hcheck >= N2RNG_HCHECK_LIMIT) 194ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EIO; 195ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller udelay(10000); 196ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 197ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -ENODEV; 198ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 199ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 200ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 201ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic unsigned long n2rng_read_diag_data_one(struct n2rng *np, 202ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long unit, 203ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long data_ra, 204ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long data_len, 205ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long *ticks) 206ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 207ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long hv_err; 208ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 209ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (np->hvapi_major == 1) { 210ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_data_read_diag_v1(data_ra, data_len, ticks); 211ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 212ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_data_read_diag_v2(data_ra, data_len, 213ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unit, ticks); 214ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!*ticks) 215ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller *ticks = N2RNG_ACCUM_CYCLES_DEFAULT; 216ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 217ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return hv_err; 218ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 219ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 220ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_generic_read_diag_data(struct n2rng *np, 221ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long unit, 222ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long data_ra, 223ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long data_len) 224ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 225ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ticks, hv_err; 226ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int block = 0; 227ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 228ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller while (1) { 229ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = n2rng_read_diag_data_one(np, unit, 230ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller data_ra, data_len, 231ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &ticks); 232ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EOK) 233ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 234ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 235ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EWOULDBLOCK) { 236ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++block >= N2RNG_BLOCK_LIMIT) 237ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EWOULDBLOCK; 238ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller __delay(ticks); 239ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_ENOACCESS) { 240ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EPERM; 241ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_EIO) { 242ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EIO; 243ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 244ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -ENODEV; 245ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 246ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 247ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 248ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 249ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_generic_write_control(struct n2rng *np, 250ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long control_ra, 251ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long unit, 252ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long state) 253ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 254ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long hv_err, ticks; 255ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int block = 0, busy = 0; 256ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 257ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller while (1) { 258ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = n2rng_write_ctl_one(np, unit, state, control_ra, 259ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->wd_timeo, &ticks); 260ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EOK) 261ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 262ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 263ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (hv_err == HV_EWOULDBLOCK) { 264ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++block >= N2RNG_BLOCK_LIMIT) 265ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EWOULDBLOCK; 266ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller __delay(ticks); 267ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (hv_err == HV_EBUSY) { 268ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++busy >= N2RNG_BUSY_LIMIT) 269ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -EBUSY; 270ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller udelay(1); 271ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 272ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -ENODEV; 273ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 274ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 275ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 276ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* Just try to see if we can successfully access the control register 277ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * of the RNG on the domain on which we are currently executing. 278ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 279ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_try_read_ctl(struct n2rng *np) 280ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 281ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long hv_err; 282ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long x; 283ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 284ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (np->hvapi_major == 1) { 285ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_get_diag_ctl(); 286ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 287ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller /* We purposefully give invalid arguments, HV_NOACCESS 288ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * is higher priority than the errors we'd get from 289ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * these other cases, and that's the error we are 290ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * truly interested in. 291ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 292ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = sun4v_rng_ctl_read_v2(0UL, ~0UL, &x, &x, &x, &x); 293ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller switch (hv_err) { 294ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_EWOULDBLOCK: 295ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller case HV_ENOACCESS: 296ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 297ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller default: 298ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hv_err = HV_EOK; 299ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 300ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 301ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 302ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 303ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return n2rng_hv_err_trans(hv_err); 304ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 305ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 306ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define CONTROL_DEFAULT_BASE \ 307ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller ((2 << RNG_CTL_ASEL_SHIFT) | \ 308ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (N2RNG_ACCUM_CYCLES_DEFAULT << RNG_CTL_WAIT_SHIFT) | \ 309ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_LFSR) 310ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 311ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define CONTROL_DEFAULT_0 \ 312ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (CONTROL_DEFAULT_BASE | \ 313ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (1 << RNG_CTL_VCO_SHIFT) | \ 314ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_ES1) 315ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define CONTROL_DEFAULT_1 \ 316ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (CONTROL_DEFAULT_BASE | \ 317ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (2 << RNG_CTL_VCO_SHIFT) | \ 318ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_ES2) 319ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define CONTROL_DEFAULT_2 \ 320ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (CONTROL_DEFAULT_BASE | \ 321ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (3 << RNG_CTL_VCO_SHIFT) | \ 322ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_ES3) 323ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller#define CONTROL_DEFAULT_3 \ 324ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (CONTROL_DEFAULT_BASE | \ 325ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_ES1 | RNG_CTL_ES2 | RNG_CTL_ES3) 326ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 327ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic void n2rng_control_swstate_init(struct n2rng *np) 328ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 329ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i; 330ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 331ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->flags |= N2RNG_FLAG_CONTROL; 332ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 333ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->health_check_sec = N2RNG_HEALTH_CHECK_SEC_DEFAULT; 334ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->accum_cycles = N2RNG_ACCUM_CYCLES_DEFAULT; 335ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->wd_timeo = N2RNG_WD_TIMEO_DEFAULT; 336ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 337ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 0; i < np->num_units; i++) { 338ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller struct n2rng_unit *up = &np->units[i]; 339ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 340ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[0] = CONTROL_DEFAULT_0; 341ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[1] = CONTROL_DEFAULT_1; 342ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[2] = CONTROL_DEFAULT_2; 343ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[3] = CONTROL_DEFAULT_3; 344ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 345ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 346ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hv_state = HV_RNG_STATE_UNCONFIGURED; 347ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 348ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 349ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_grab_diag_control(struct n2rng *np) 350ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 351ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i, busy_count, err = -ENODEV; 352ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 353ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller busy_count = 0; 354ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 0; i < 100; i++) { 355ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_try_read_ctl(np); 356ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err != -EAGAIN) 357ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 358ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 359ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (++busy_count > 100) { 360ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_err(&np->op->dev, 361ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller "Grab diag control timeout.\n"); 362ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return -ENODEV; 363ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 364ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 365ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller udelay(1); 366ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 367ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 368ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 369ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 370ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 371ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_init_control(struct n2rng *np) 372ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 373ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err = n2rng_grab_diag_control(np); 374ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 375ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller /* Not in the control domain, that's OK we are only a consumer 376ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * of the RNG data, we don't setup and program it. 377ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 378ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err == -EPERM) 379ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 380ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 381ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 382ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 383ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller n2rng_control_swstate_init(np); 384ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 385ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 386ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 387ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 388ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_data_read(struct hwrng *rng, u32 *data) 389ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 390ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller struct n2rng *np = (struct n2rng *) rng->priv; 391ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ra = __pa(&np->test_data); 392ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int len; 393ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 394ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!(np->flags & N2RNG_FLAG_READY)) { 395ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller len = 0; 396ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else if (np->flags & N2RNG_FLAG_BUFFER_VALID) { 397ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->flags &= ~N2RNG_FLAG_BUFFER_VALID; 398ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller *data = np->buffer; 399ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller len = 4; 400ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 401ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err = n2rng_generic_read_data(ra); 402ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!err) { 403ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->buffer = np->test_data >> 32; 404ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller *data = np->test_data & 0xffffffff; 405ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller len = 4; 406ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 407ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_err(&np->op->dev, "RNG error, restesting\n"); 408ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->flags &= ~N2RNG_FLAG_READY; 409ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!(np->flags & N2RNG_FLAG_SHUTDOWN)) 410ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller schedule_delayed_work(&np->work, 0); 411ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller len = 0; 412ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 413ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 414ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 415ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return len; 416ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 417ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 418ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* On a guest node, just make sure we can read random data properly. 419ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * If a control node reboots or reloads it's n2rng driver, this won't 420ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * work during that time. So we have to keep probing until the device 421ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * becomes usable. 422ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 423ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_guest_check(struct n2rng *np) 424ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 425ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ra = __pa(&np->test_data); 426ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 427ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return n2rng_generic_read_data(ra); 428ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 429ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 430ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_entropy_diag_read(struct n2rng *np, unsigned long unit, 431ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller u64 *pre_control, u64 pre_state, 432ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller u64 *buffer, unsigned long buf_len, 433ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller u64 *post_control, u64 post_state) 434ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 435ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long post_ctl_ra = __pa(post_control); 436ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long pre_ctl_ra = __pa(pre_control); 437ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long buffer_ra = __pa(buffer); 438ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err; 439ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 440ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_generic_write_control(np, pre_ctl_ra, unit, pre_state); 441ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 442ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 443ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 444ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_generic_read_diag_data(np, unit, 445ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller buffer_ra, buf_len); 446ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 447ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (void) n2rng_generic_write_control(np, post_ctl_ra, unit, 448ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller post_state); 449ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 450ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 451ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 452ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 453ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic u64 advance_polynomial(u64 poly, u64 val, int count) 454ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 455ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i; 456ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 457ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 0; i < count; i++) { 458ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int highbit_set = ((s64)val < 0); 459ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 460ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller val <<= 1; 461ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (highbit_set) 462ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller val ^= poly; 463ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 464ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 465ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return val; 466ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 467ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 468ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_test_buffer_find(struct n2rng *np, u64 val) 469ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 470ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i, count = 0; 471ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 472ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller /* Purposefully skip over the first word. */ 473ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 1; i < SELFTEST_BUFFER_WORDS; i++) { 474ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (np->test_buffer[i] == val) 475ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller count++; 476ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 477ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return count; 478ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 479ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 480ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic void n2rng_dump_test_buffer(struct n2rng *np) 481ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 482ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i; 483ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 484ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 0; i < SELFTEST_BUFFER_WORDS; i++) 4853f4528d6e91cffde49894f5252e6657d420d3d74Sam Ravnborg dev_err(&np->op->dev, "Test buffer slot %d [0x%016llx]\n", 486ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller i, np->test_buffer[i]); 487ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 488ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 489ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_check_selftest_buffer(struct n2rng *np, unsigned long unit) 490ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 491ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller u64 val = SELFTEST_VAL; 492ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err, matches, limit; 493ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 494ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller matches = 0; 495ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (limit = 0; limit < SELFTEST_LOOPS_MAX; limit++) { 496ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller matches += n2rng_test_buffer_find(np, val); 497ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (matches >= SELFTEST_MATCH_GOAL) 498ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 499ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller val = advance_polynomial(SELFTEST_POLY, val, 1); 500ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 501ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 502ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = 0; 503ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (limit >= SELFTEST_LOOPS_MAX) { 504ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = -ENODEV; 505ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_err(&np->op->dev, "Selftest failed on unit %lu\n", unit); 506ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller n2rng_dump_test_buffer(np); 507ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 508ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_info(&np->op->dev, "Selftest passed on unit %lu\n", unit); 509ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 510ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 511ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 512ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 513ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_control_selftest(struct n2rng *np, unsigned long unit) 514ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 515ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err; 516ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 517ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->test_control[0] = (0x2 << RNG_CTL_ASEL_SHIFT); 518ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->test_control[1] = (0x2 << RNG_CTL_ASEL_SHIFT); 519ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->test_control[2] = (0x2 << RNG_CTL_ASEL_SHIFT); 520ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->test_control[3] = ((0x2 << RNG_CTL_ASEL_SHIFT) | 521ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_LFSR | 522ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller ((SELFTEST_TICKS - 2) << RNG_CTL_WAIT_SHIFT)); 523ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 524ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 525ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_entropy_diag_read(np, unit, np->test_control, 526ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller HV_RNG_STATE_HEALTHCHECK, 527ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->test_buffer, 528ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller sizeof(np->test_buffer), 529ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &np->units[unit].control[0], 530ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hv_state); 531ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 532ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 533ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 534ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return n2rng_check_selftest_buffer(np, unit); 535ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 536ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 537ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_control_check(struct n2rng *np) 538ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 539ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int i; 540ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 541ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (i = 0; i < np->num_units; i++) { 542ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err = n2rng_control_selftest(np, i); 543ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 544ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 545ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 546ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 547ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 548ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 549ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller/* The sanity checks passed, install the final configuration into the 550ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * chip, it's ready to use. 551ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 552ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int n2rng_control_configure_units(struct n2rng *np) 553ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 554ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int unit, err; 555ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 556ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = 0; 557ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (unit = 0; unit < np->num_units; unit++) { 558ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller struct n2rng_unit *up = &np->units[unit]; 559ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller unsigned long ctl_ra = __pa(&up->control[0]); 560ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int esrc; 561ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller u64 base; 562ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 563ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller base = ((np->accum_cycles << RNG_CTL_WAIT_SHIFT) | 564ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (2 << RNG_CTL_ASEL_SHIFT) | 565ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller RNG_CTL_LFSR); 566ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 567ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller /* XXX This isn't the best. We should fetch a bunch 568ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * XXX of words using each entropy source combined XXX 569ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * with each VCO setting, and see which combinations 570ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller * XXX give the best random data. 571ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller */ 572ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller for (esrc = 0; esrc < 3; esrc++) 573ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[esrc] = base | 574ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (esrc << RNG_CTL_VCO_SHIFT) | 575ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (RNG_CTL_ES1 << esrc); 576ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 577ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller up->control[3] = base | 578ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller (RNG_CTL_ES1 | RNG_CTL_ES2 | RNG_CTL_ES3); 579ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 580ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_generic_write_control(np, ctl_ra, unit, 581ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller HV_RNG_STATE_CONFIGURED); 582ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 583ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller break; 584ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 585ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 586ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 587ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 588ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 589ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic void n2rng_work(struct work_struct *work) 590ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 591ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller struct n2rng *np = container_of(work, struct n2rng, work.work); 592ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err = 0; 593ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 594ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!(np->flags & N2RNG_FLAG_CONTROL)) { 595ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_guest_check(np); 596ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else { 597ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller preempt_disable(); 598ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_control_check(np); 599ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller preempt_enable(); 600ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 601ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!err) 602ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_control_configure_units(np); 603ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 604ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 605ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!err) { 606ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->flags |= N2RNG_FLAG_READY; 607ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_info(&np->op->dev, "RNG ready\n"); 608ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 609ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 610ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err && !(np->flags & N2RNG_FLAG_SHUTDOWN)) 611ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller schedule_delayed_work(&np->work, HZ * 2); 612ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 613ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 614ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic void __devinit n2rng_driver_version(void) 615ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 616ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller static int n2rng_version_printed; 617ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 618ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (n2rng_version_printed++ == 0) 619ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller pr_info("%s", version); 620ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 621ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 622ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int __devinit n2rng_probe(struct of_device *op, 623ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller const struct of_device_id *match) 624ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 625ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int victoria_falls = (match->data != NULL); 626ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller int err = -ENOMEM; 627ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller struct n2rng *np; 628ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 629ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller n2rng_driver_version(); 630ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 631ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np = kzalloc(sizeof(*np), GFP_KERNEL); 632ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!np) 633ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller goto out; 634ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->op = op; 635ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 636ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller INIT_DELAYED_WORK(&np->work, n2rng_work); 637ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 638ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (victoria_falls) 639ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->flags |= N2RNG_FLAG_VF; 640ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 641ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = -ENODEV; 642ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hvapi_major = 2; 643ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (sun4v_hvapi_register(HV_GRP_RNG, 644ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hvapi_major, 645ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller &np->hvapi_minor)) { 646ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hvapi_major = 1; 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 dev_err(&op->dev, "Cannot register suitable " 651ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller "HVAPI version.\n"); 652ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller goto out_free; 653ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 654ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 655ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 656ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (np->flags & N2RNG_FLAG_VF) { 657ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (np->hvapi_major < 2) { 658ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_err(&op->dev, "VF RNG requires HVAPI major " 659ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller "version 2 or later, got %lu\n", 660ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hvapi_major); 661ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller goto out_hvapi_unregister; 662ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 663ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->num_units = of_getintprop_default(op->node, 664ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller "rng-#units", 0); 665ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!np->num_units) { 666ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_err(&op->dev, "VF RNG lacks rng-#units property\n"); 667ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller goto out_hvapi_unregister; 668ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } 669ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller } else 670ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->num_units = 1; 671ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 672ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_info(&op->dev, "Registered RNG HVAPI major %lu minor %lu\n", 673ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hvapi_major, np->hvapi_minor); 674ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 675ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->units = kzalloc(sizeof(struct n2rng_unit) * np->num_units, 676ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller GFP_KERNEL); 677ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = -ENOMEM; 678ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (!np->units) 679ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller goto out_hvapi_unregister; 680ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 681ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = n2rng_init_control(np); 682ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 683ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller goto out_free_units; 684ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 685ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_info(&op->dev, "Found %s RNG, units: %d\n", 686ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller ((np->flags & N2RNG_FLAG_VF) ? 687ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller "Victoria Falls" : "Niagara2"), 688ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->num_units); 689ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 690ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hwrng.name = "n2rng"; 691ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hwrng.data_read = n2rng_data_read; 692ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->hwrng.priv = (unsigned long) np; 693ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 694ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller err = hwrng_register(&np->hwrng); 695ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller if (err) 696ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller goto out_free_units; 697ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 698ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_set_drvdata(&op->dev, np); 699ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 700ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller schedule_delayed_work(&np->work, 0); 701ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 702ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 703ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 704ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerout_free_units: 705ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller kfree(np->units); 706ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->units = NULL; 707ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 708ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerout_hvapi_unregister: 709ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller sun4v_hvapi_unregister(HV_GRP_RNG); 710ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 711ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerout_free: 712ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller kfree(np); 713ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerout: 714ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return err; 715ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 716ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 717ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int __devexit n2rng_remove(struct of_device *op) 718ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 719ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller struct n2rng *np = dev_get_drvdata(&op->dev); 720ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 721ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->flags |= N2RNG_FLAG_SHUTDOWN; 722ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 723ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller cancel_delayed_work_sync(&np->work); 724ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 725ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller hwrng_unregister(&np->hwrng); 726ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 727ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller sun4v_hvapi_unregister(HV_GRP_RNG); 728ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 729ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller kfree(np->units); 730ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller np->units = NULL; 731ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 732ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller kfree(np); 733ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 734ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller dev_set_drvdata(&op->dev, NULL); 735ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 736ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return 0; 737ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 738ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 739fd098316ef533e8441576f020ead4beab93154ceDavid S. Millerstatic const struct of_device_id n2rng_match[] = { 740ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller { 741ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .name = "random-number-generator", 742ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .compatible = "SUNW,n2-rng", 743ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller }, 744ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller { 745ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .name = "random-number-generator", 746ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .compatible = "SUNW,vf-rng", 747ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .data = (void *) 1, 748ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller }, 749ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller {}, 750ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller}; 751ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. MillerMODULE_DEVICE_TABLE(of, n2rng_match); 752ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 753ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic struct of_platform_driver n2rng_driver = { 754ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .name = "n2rng", 755ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .match_table = n2rng_match, 756ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .probe = n2rng_probe, 757ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller .remove = __devexit_p(n2rng_remove), 758ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller}; 759ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 760ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic int __init n2rng_init(void) 761ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 762ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller return of_register_driver(&n2rng_driver, &of_bus_type); 763ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 764ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 765ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millerstatic void __exit n2rng_exit(void) 766ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller{ 767ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller of_unregister_driver(&n2rng_driver); 768ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller} 769ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Miller 770ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millermodule_init(n2rng_init); 771ce087150211412afd901a3fa16b1aab5b54d1bcbDavid S. Millermodule_exit(n2rng_exit); 772