arch/powerpc/platforms/cell/spufs/hw_ops.c

   1 /* hw_ops.c - query/set operations on active SPU context.
   2  *
   3  * Copyright (C) IBM 2005
   4  * Author: Mark Nutter <mnutter@us.ibm.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <linux/config.h>
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/sched.h>
  25 #include <linux/kernel.h>
  26 #include <linux/mm.h>
  27 #include <linux/poll.h>
  28 #include <linux/smp.h>
  29 #include <linux/smp_lock.h>
  30 #include <linux/stddef.h>
  31 #include <linux/unistd.h>
  32
  33 #include <asm/io.h>
  34 #include <asm/spu.h>
  35 #include <asm/spu_csa.h>
  36 #include <asm/mmu_context.h>
  37 #include "spufs.h"
  38
  39 static int spu_hw_mbox_read(struct spu_context *ctx, u32 * data)
  40 {
  41         struct spu *spu = ctx->spu;
  42         struct spu_problem __iomem *prob = spu->problem;
  43         u32 mbox_stat;
  44         int ret = 0;
  45
  46         spin_lock_irq(&spu->register_lock);
  47         mbox_stat = in_be32(&prob->mb_stat_R);
  48         if (mbox_stat & 0x0000ff) {
  49                 *data = in_be32(&prob->pu_mb_R);
  50                 ret = 4;
  51         }
  52         spin_unlock_irq(&spu->register_lock);
  53         return ret;
  54 }
  55
  56 static u32 spu_hw_mbox_stat_read(struct spu_context *ctx)
  57 {
  58         return in_be32(&ctx->spu->problem->mb_stat_R);
  59 }
  60
  61 static unsigned int spu_hw_mbox_stat_poll(struct spu_context *ctx,
  62                                           unsigned int events)
  63 {
  64         struct spu *spu = ctx->spu;
  65         int ret = 0;
  66         u32 stat;
  67
  68         spin_lock_irq(&spu->register_lock);
  69         stat = in_be32(&spu->problem->mb_stat_R);
  70
  71         /* if the requested event is there, return the poll
  72            mask, otherwise enable the interrupt to get notified,
  73            but first mark any pending interrupts as done so
  74            we don't get woken up unnecessarily */
  75
  76         if (events & (POLLIN | POLLRDNORM)) {
  77                 if (stat & 0xff0000)
  78                         ret |= POLLIN | POLLRDNORM;
  79                 else {
  80                         spu_int_stat_clear(spu, 2, 0x1);
  81                         spu_int_mask_or(spu, 2, 0x1);
  82                 }
  83         }
  84         if (events & (POLLOUT | POLLWRNORM)) {
  85                 if (stat & 0x00ff00)
  86                         ret = POLLOUT | POLLWRNORM;
  87                 else {
  88                         spu_int_stat_clear(spu, 2, 0x10);
  89                         spu_int_mask_or(spu, 2, 0x10);
  90                 }
  91         }
  92         spin_unlock_irq(&spu->register_lock);
  93         return ret;
  94 }
  95
  96 static int spu_hw_ibox_read(struct spu_context *ctx, u32 * data)
  97 {
  98         struct spu *spu = ctx->spu;
  99         struct spu_problem __iomem *prob = spu->problem;
 100         struct spu_priv2 __iomem *priv2 = spu->priv2;
 101         int ret;
 102
 103         spin_lock_irq(&spu->register_lock);
 104         if (in_be32(&prob->mb_stat_R) & 0xff0000) {
 105                 /* read the first available word */
 106                 *data = in_be64(&priv2->puint_mb_R);
 107                 ret = 4;
 108         } else {
 109                 /* make sure we get woken up by the interrupt */
 110                 spu_int_mask_or(spu, 2, 0x1);
 111                 ret = 0;
 112         }
 113         spin_unlock_irq(&spu->register_lock);
 114         return ret;
 115 }
 116
 117 static int spu_hw_wbox_write(struct spu_context *ctx, u32 data)
 118 {
 119         struct spu *spu = ctx->spu;
 120         struct spu_problem __iomem *prob = spu->problem;
 121         int ret;
 122
 123         spin_lock_irq(&spu->register_lock);
 124         if (in_be32(&prob->mb_stat_R) & 0x00ff00) {
 125                 /* we have space to write wbox_data to */
 126                 out_be32(&prob->spu_mb_W, data);
 127                 ret = 4;
 128         } else {
 129                 /* make sure we get woken up by the interrupt when space
 130                    becomes available */
 131                 spu_int_mask_or(spu, 2, 0x10);
 132                 ret = 0;
 133         }
 134         spin_unlock_irq(&spu->register_lock);
 135         return ret;
 136 }
 137
 138 static u32 spu_hw_signal1_read(struct spu_context *ctx)
 139 {
 140         return in_be32(&ctx->spu->problem->signal_notify1);
 141 }
 142
 143 static void spu_hw_signal1_write(struct spu_context *ctx, u32 data)
 144 {
 145         out_be32(&ctx->spu->problem->signal_notify1, data);
 146 }
 147
 148 static u32 spu_hw_signal2_read(struct spu_context *ctx)
 149 {
 150         return in_be32(&ctx->spu->problem->signal_notify1);
 151 }
 152
 153 static void spu_hw_signal2_write(struct spu_context *ctx, u32 data)
 154 {
 155         out_be32(&ctx->spu->problem->signal_notify2, data);
 156 }
 157
 158 static void spu_hw_signal1_type_set(struct spu_context *ctx, u64 val)
 159 {
 160         struct spu *spu = ctx->spu;
 161         struct spu_priv2 __iomem *priv2 = spu->priv2;
 162         u64 tmp;
 163
 164         spin_lock_irq(&spu->register_lock);
 165         tmp = in_be64(&priv2->spu_cfg_RW);
 166         if (val)
 167                 tmp |= 1;
 168         else
 169                 tmp &= ~1;
 170         out_be64(&priv2->spu_cfg_RW, tmp);
 171         spin_unlock_irq(&spu->register_lock);
 172 }
 173
 174 static u64 spu_hw_signal1_type_get(struct spu_context *ctx)
 175 {
 176         return ((in_be64(&ctx->spu->priv2->spu_cfg_RW) & 1) != 0);
 177 }
 178
 179 static void spu_hw_signal2_type_set(struct spu_context *ctx, u64 val)
 180 {
 181         struct spu *spu = ctx->spu;
 182         struct spu_priv2 __iomem *priv2 = spu->priv2;
 183         u64 tmp;
 184
 185         spin_lock_irq(&spu->register_lock);
 186         tmp = in_be64(&priv2->spu_cfg_RW);
 187         if (val)
 188                 tmp |= 2;
 189         else
 190                 tmp &= ~2;
 191         out_be64(&priv2->spu_cfg_RW, tmp);
 192         spin_unlock_irq(&spu->register_lock);
 193 }
 194
 195 static u64 spu_hw_signal2_type_get(struct spu_context *ctx)
 196 {
 197         return ((in_be64(&ctx->spu->priv2->spu_cfg_RW) & 2) != 0);
 198 }
 199
 200 static u32 spu_hw_npc_read(struct spu_context *ctx)
 201 {
 202         return in_be32(&ctx->spu->problem->spu_npc_RW);
 203 }
 204
 205 static void spu_hw_npc_write(struct spu_context *ctx, u32 val)
 206 {
 207         out_be32(&ctx->spu->problem->spu_npc_RW, val);
 208 }
 209
 210 static u32 spu_hw_status_read(struct spu_context *ctx)
 211 {
 212         return in_be32(&ctx->spu->problem->spu_status_R);
 213 }
 214
 215 static char *spu_hw_get_ls(struct spu_context *ctx)
 216 {
 217         return ctx->spu->local_store;
 218 }
 219
 220 static void spu_hw_runcntl_write(struct spu_context *ctx, u32 val)
 221 {
 222         eieio();
 223         out_be32(&ctx->spu->problem->spu_runcntl_RW, val);
 224 }
 225
 226 static void spu_hw_runcntl_stop(struct spu_context *ctx)
 227 {
 228         spin_lock_irq(&ctx->spu->register_lock);
 229         out_be32(&ctx->spu->problem->spu_runcntl_RW, SPU_RUNCNTL_STOP);
 230         while (in_be32(&ctx->spu->problem->spu_status_R) & SPU_STATUS_RUNNING)
 231                 cpu_relax();
 232         spin_unlock_irq(&ctx->spu->register_lock);
 233 }
 234
 235 struct spu_context_ops spu_hw_ops = {
 236         .mbox_read = spu_hw_mbox_read,
 237         .mbox_stat_read = spu_hw_mbox_stat_read,
 238         .mbox_stat_poll = spu_hw_mbox_stat_poll,
 239         .ibox_read = spu_hw_ibox_read,
 240         .wbox_write = spu_hw_wbox_write,
 241         .signal1_read = spu_hw_signal1_read,
 242         .signal1_write = spu_hw_signal1_write,
 243         .signal2_read = spu_hw_signal2_read,
 244         .signal2_write = spu_hw_signal2_write,
 245         .signal1_type_set = spu_hw_signal1_type_set,
 246         .signal1_type_get = spu_hw_signal1_type_get,
 247         .signal2_type_set = spu_hw_signal2_type_set,
 248         .signal2_type_get = spu_hw_signal2_type_get,
 249         .npc_read = spu_hw_npc_read,
 250         .npc_write = spu_hw_npc_write,
 251         .status_read = spu_hw_status_read,
 252         .get_ls = spu_hw_get_ls,
 253         .runcntl_write = spu_hw_runcntl_write,
 254         .runcntl_stop = spu_hw_runcntl_stop,
 255 };