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   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_priv1.h>
  36 #include <asm/spu_csa.h>
  37 #include <asm/mmu_context.h>
  38 #include "spufs.h"
  39
  40 static int spu_hw_mbox_read(struct spu_context *ctx, u32 * data)
  41 {
  42         struct spu *spu = ctx->spu;
  43         struct spu_problem __iomem *prob = spu->problem;
  44         u32 mbox_stat;
  45         int ret = 0;
  46
  47         spin_lock_irq(&spu->register_lock);
  48         mbox_stat = in_be32(&prob->mb_stat_R);
  49         if (mbox_stat & 0x0000ff) {
  50                 *data = in_be32(&prob->pu_mb_R);
  51                 ret = 4;
  52         }
  53         spin_unlock_irq(&spu->register_lock);
  54         return ret;
  55 }
  56
  57 static u32 spu_hw_mbox_stat_read(struct spu_context *ctx)
  58 {
  59         return in_be32(&ctx->spu->problem->mb_stat_R);
  60 }
  61
  62 static unsigned int spu_hw_mbox_stat_poll(struct spu_context *ctx,
  63                                           unsigned int events)
  64 {
  65         struct spu *spu = ctx->spu;
  66         int ret = 0;
  67         u32 stat;
  68
  69         spin_lock_irq(&spu->register_lock);
  70         stat = in_be32(&spu->problem->mb_stat_R);
  71
  72         /* if the requested event is there, return the poll
  73            mask, otherwise enable the interrupt to get notified,
  74            but first mark any pending interrupts as done so
  75            we don't get woken up unnecessarily */
  76
  77         if (events & (POLLIN | POLLRDNORM)) {
  78                 if (stat & 0xff0000)
  79                         ret |= POLLIN | POLLRDNORM;
  80                 else {
  81                         spu_int_stat_clear(spu, 2, 0x1);
  82                         spu_int_mask_or(spu, 2, 0x1);
  83                 }
  84         }
  85         if (events & (POLLOUT | POLLWRNORM)) {
  86                 if (stat & 0x00ff00)
  87                         ret = POLLOUT | POLLWRNORM;
  88                 else {
  89                         spu_int_stat_clear(spu, 2, 0x10);
  90                         spu_int_mask_or(spu, 2, 0x10);
  91                 }
  92         }
  93         spin_unlock_irq(&spu->register_lock);
  94         return ret;
  95 }
  96
  97 static int spu_hw_ibox_read(struct spu_context *ctx, u32 * data)
  98 {
  99         struct spu *spu = ctx->spu;
 100         struct spu_problem __iomem *prob = spu->problem;
 101         struct spu_priv2 __iomem *priv2 = spu->priv2;
 102         int ret;
 103
 104         spin_lock_irq(&spu->register_lock);
 105         if (in_be32(&prob->mb_stat_R) & 0xff0000) {
 106                 /* read the first available word */
 107                 *data = in_be64(&priv2->puint_mb_R);
 108                 ret = 4;
 109         } else {
 110                 /* make sure we get woken up by the interrupt */
 111                 spu_int_mask_or(spu, 2, 0x1);
 112                 ret = 0;
 113         }
 114         spin_unlock_irq(&spu->register_lock);
 115         return ret;
 116 }
 117
 118 static int spu_hw_wbox_write(struct spu_context *ctx, u32 data)
 119 {
 120         struct spu *spu = ctx->spu;
 121         struct spu_problem __iomem *prob = spu->problem;
 122         int ret;
 123
 124         spin_lock_irq(&spu->register_lock);
 125         if (in_be32(&prob->mb_stat_R) & 0x00ff00) {
 126                 /* we have space to write wbox_data to */
 127                 out_be32(&prob->spu_mb_W, data);
 128                 ret = 4;
 129         } else {
 130                 /* make sure we get woken up by the interrupt when space
 131                    becomes available */
 132                 spu_int_mask_or(spu, 2, 0x10);
 133                 ret = 0;
 134         }
 135         spin_unlock_irq(&spu->register_lock);
 136         return ret;
 137 }
 138
 139 static u32 spu_hw_signal1_read(struct spu_context *ctx)
 140 {
 141         return in_be32(&ctx->spu->problem->signal_notify1);
 142 }
 143
 144 static void spu_hw_signal1_write(struct spu_context *ctx, u32 data)
 145 {
 146         out_be32(&ctx->spu->problem->signal_notify1, data);
 147 }
 148
 149 static u32 spu_hw_signal2_read(struct spu_context *ctx)
 150 {
 151         return in_be32(&ctx->spu->problem->signal_notify1);
 152 }
 153
 154 static void spu_hw_signal2_write(struct spu_context *ctx, u32 data)
 155 {
 156         out_be32(&ctx->spu->problem->signal_notify2, data);
 157 }
 158
 159 static void spu_hw_signal1_type_set(struct spu_context *ctx, u64 val)
 160 {
 161         struct spu *spu = ctx->spu;
 162         struct spu_priv2 __iomem *priv2 = spu->priv2;
 163         u64 tmp;
 164
 165         spin_lock_irq(&spu->register_lock);
 166         tmp = in_be64(&priv2->spu_cfg_RW);
 167         if (val)
 168                 tmp |= 1;
 169         else
 170                 tmp &= ~1;
 171         out_be64(&priv2->spu_cfg_RW, tmp);
 172         spin_unlock_irq(&spu->register_lock);
 173 }
 174
 175 static u64 spu_hw_signal1_type_get(struct spu_context *ctx)
 176 {
 177         return ((in_be64(&ctx->spu->priv2->spu_cfg_RW) & 1) != 0);
 178 }
 179
 180 static void spu_hw_signal2_type_set(struct spu_context *ctx, u64 val)
 181 {
 182         struct spu *spu = ctx->spu;
 183         struct spu_priv2 __iomem *priv2 = spu->priv2;
 184         u64 tmp;
 185
 186         spin_lock_irq(&spu->register_lock);
 187         tmp = in_be64(&priv2->spu_cfg_RW);
 188         if (val)
 189                 tmp |= 2;
 190         else
 191                 tmp &= ~2;
 192         out_be64(&priv2->spu_cfg_RW, tmp);
 193         spin_unlock_irq(&spu->register_lock);
 194 }
 195
 196 static u64 spu_hw_signal2_type_get(struct spu_context *ctx)
 197 {
 198         return ((in_be64(&ctx->spu->priv2->spu_cfg_RW) & 2) != 0);
 199 }
 200
 201 static u32 spu_hw_npc_read(struct spu_context *ctx)
 202 {
 203         return in_be32(&ctx->spu->problem->spu_npc_RW);
 204 }
 205
 206 static void spu_hw_npc_write(struct spu_context *ctx, u32 val)
 207 {
 208         out_be32(&ctx->spu->problem->spu_npc_RW, val);
 209 }
 210
 211 static u32 spu_hw_status_read(struct spu_context *ctx)
 212 {
 213         return in_be32(&ctx->spu->problem->spu_status_R);
 214 }
 215
 216 static char *spu_hw_get_ls(struct spu_context *ctx)
 217 {
 218         return ctx->spu->local_store;
 219 }
 220
 221 static void spu_hw_runcntl_write(struct spu_context *ctx, u32 val)
 222 {
 223         eieio();
 224         out_be32(&ctx->spu->problem->spu_runcntl_RW, val);
 225 }
 226
 227 static void spu_hw_runcntl_stop(struct spu_context *ctx)
 228 {
 229         spin_lock_irq(&ctx->spu->register_lock);
 230         out_be32(&ctx->spu->problem->spu_runcntl_RW, SPU_RUNCNTL_STOP);
 231         while (in_be32(&ctx->spu->problem->spu_status_R) & SPU_STATUS_RUNNING)
 232                 cpu_relax();
 233         spin_unlock_irq(&ctx->spu->register_lock);
 234 }
 235
 236 static int spu_hw_set_mfc_query(struct spu_context * ctx, u32 mask, u32 mode)
 237 {
 238         struct spu_problem *prob = ctx->spu->problem;
 239         int ret;
 240
 241         spin_lock_irq(&ctx->spu->register_lock);
 242         ret = -EAGAIN;
 243         if (in_be32(&prob->dma_querytype_RW))
 244                 goto out;
 245         ret = 0;
 246         out_be32(&prob->dma_querymask_RW, mask);
 247         out_be32(&prob->dma_querytype_RW, mode);
 248 out:
 249         spin_unlock_irq(&ctx->spu->register_lock);
 250         return ret;
 251 }
 252
 253 static u32 spu_hw_read_mfc_tagstatus(struct spu_context * ctx)
 254 {
 255         return in_be32(&ctx->spu->problem->dma_tagstatus_R);
 256 }
 257
 258 static u32 spu_hw_get_mfc_free_elements(struct spu_context *ctx)
 259 {
 260         return in_be32(&ctx->spu->problem->dma_qstatus_R);
 261 }
 262
 263 static int spu_hw_send_mfc_command(struct spu_context *ctx,
 264                                         struct mfc_dma_command *cmd)
 265 {
 266         u32 status;
 267         struct spu_problem *prob = ctx->spu->problem;
 268
 269         spin_lock_irq(&ctx->spu->register_lock);
 270         out_be32(&prob->mfc_lsa_W, cmd->lsa);
 271         out_be64(&prob->mfc_ea_W, cmd->ea);
 272         out_be32(&prob->mfc_union_W.by32.mfc_size_tag32,
 273                                 cmd->size << 16 | cmd->tag);
 274         out_be32(&prob->mfc_union_W.by32.mfc_class_cmd32,
 275                                 cmd->class << 16 | cmd->cmd);
 276         status = in_be32(&prob->mfc_union_W.by32.mfc_class_cmd32);
 277         spin_unlock_irq(&ctx->spu->register_lock);
 278
 279         switch (status & 0xffff) {
 280         case 0:
 281                 return 0;
 282         case 2:
 283                 return -EAGAIN;
 284         default:
 285                 return -EINVAL;
 286         }
 287 }
 288
 289 struct spu_context_ops spu_hw_ops = {
 290         .mbox_read = spu_hw_mbox_read,
 291         .mbox_stat_read = spu_hw_mbox_stat_read,
 292         .mbox_stat_poll = spu_hw_mbox_stat_poll,
 293         .ibox_read = spu_hw_ibox_read,
 294         .wbox_write = spu_hw_wbox_write,
 295         .signal1_read = spu_hw_signal1_read,
 296         .signal1_write = spu_hw_signal1_write,
 297         .signal2_read = spu_hw_signal2_read,
 298         .signal2_write = spu_hw_signal2_write,
 299         .signal1_type_set = spu_hw_signal1_type_set,
 300         .signal1_type_get = spu_hw_signal1_type_get,
 301         .signal2_type_set = spu_hw_signal2_type_set,
 302         .signal2_type_get = spu_hw_signal2_type_get,
 303         .npc_read = spu_hw_npc_read,
 304         .npc_write = spu_hw_npc_write,
 305         .status_read = spu_hw_status_read,
 306         .get_ls = spu_hw_get_ls,
 307         .runcntl_write = spu_hw_runcntl_write,
 308         .runcntl_stop = spu_hw_runcntl_stop,
 309         .set_mfc_query = spu_hw_set_mfc_query,
 310         .read_mfc_tagstatus = spu_hw_read_mfc_tagstatus,
 311         .get_mfc_free_elements = spu_hw_get_mfc_free_elements,
 312         .send_mfc_command = spu_hw_send_mfc_command,
 313 };