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

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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/errno.h>
 22 #include <linux/sched.h>
 23 #include <linux/kernel.h>
 24 #include <linux/mm.h>
 25 #include <linux/poll.h>
 26 #include <linux/smp.h>
 27 #include <linux/stddef.h>
 28 #include <linux/unistd.h>
 29 
 30 #include <asm/io.h>
 31 #include <asm/spu.h>
 32 #include <asm/spu_priv1.h>
 33 #include <asm/spu_csa.h>
 34 #include <asm/mmu_context.h>
 35 #include "spufs.h"
 36 
 37 static int spu_hw_mbox_read(struct spu_context *ctx, u32 * data)
 38 {
 39         struct spu *spu = ctx->spu;
 40         struct spu_problem __iomem *prob = spu->problem;
 41         u32 mbox_stat;
 42         int ret = 0;
 43 
 44         spin_lock_irq(&spu->register_lock);
 45         mbox_stat = in_be32(&prob->mb_stat_R);
 46         if (mbox_stat & 0x0000ff) {
 47                 *data = in_be32(&prob->pu_mb_R);
 48                 ret = 4;
 49         }
 50         spin_unlock_irq(&spu->register_lock);
 51         return ret;
 52 }
 53 
 54 static u32 spu_hw_mbox_stat_read(struct spu_context *ctx)
 55 {
 56         return in_be32(&ctx->spu->problem->mb_stat_R);
 57 }
 58 
 59 static __poll_t spu_hw_mbox_stat_poll(struct spu_context *ctx, __poll_t events)
 60 {
 61         struct spu *spu = ctx->spu;
 62         __poll_t ret = 0;
 63         u32 stat;
 64 
 65         spin_lock_irq(&spu->register_lock);
 66         stat = in_be32(&spu->problem->mb_stat_R);
 67 
 68         /* if the requested event is there, return the poll
 69            mask, otherwise enable the interrupt to get notified,
 70            but first mark any pending interrupts as done so
 71            we don't get woken up unnecessarily */
 72 
 73         if (events & (EPOLLIN | EPOLLRDNORM)) {
 74                 if (stat & 0xff0000)
 75                         ret |= EPOLLIN | EPOLLRDNORM;
 76                 else {
 77                         spu_int_stat_clear(spu, 2, CLASS2_MAILBOX_INTR);
 78                         spu_int_mask_or(spu, 2, CLASS2_ENABLE_MAILBOX_INTR);
 79                 }
 80         }
 81         if (events & (EPOLLOUT | EPOLLWRNORM)) {
 82                 if (stat & 0x00ff00)
 83                         ret = EPOLLOUT | EPOLLWRNORM;
 84                 else {
 85                         spu_int_stat_clear(spu, 2,
 86                                         CLASS2_MAILBOX_THRESHOLD_INTR);
 87                         spu_int_mask_or(spu, 2,
 88                                         CLASS2_ENABLE_MAILBOX_THRESHOLD_INTR);
 89                 }
 90         }
 91         spin_unlock_irq(&spu->register_lock);
 92         return ret;
 93 }
 94 
 95 static int spu_hw_ibox_read(struct spu_context *ctx, u32 * data)
 96 {
 97         struct spu *spu = ctx->spu;
 98         struct spu_problem __iomem *prob = spu->problem;
 99         struct spu_priv2 __iomem *priv2 = spu->priv2;
100         int ret;
101 
102         spin_lock_irq(&spu->register_lock);
103         if (in_be32(&prob->mb_stat_R) & 0xff0000) {
104                 /* read the first available word */
105                 *data = in_be64(&priv2->puint_mb_R);
106                 ret = 4;
107         } else {
108                 /* make sure we get woken up by the interrupt */
109                 spu_int_mask_or(spu, 2, CLASS2_ENABLE_MAILBOX_INTR);
110                 ret = 0;
111         }
112         spin_unlock_irq(&spu->register_lock);
113         return ret;
114 }
115 
116 static int spu_hw_wbox_write(struct spu_context *ctx, u32 data)
117 {
118         struct spu *spu = ctx->spu;
119         struct spu_problem __iomem *prob = spu->problem;
120         int ret;
121 
122         spin_lock_irq(&spu->register_lock);
123         if (in_be32(&prob->mb_stat_R) & 0x00ff00) {
124                 /* we have space to write wbox_data to */
125                 out_be32(&prob->spu_mb_W, data);
126                 ret = 4;
127         } else {
128                 /* make sure we get woken up by the interrupt when space
129                    becomes available */
130                 spu_int_mask_or(spu, 2, CLASS2_ENABLE_MAILBOX_THRESHOLD_INTR);
131                 ret = 0;
132         }
133         spin_unlock_irq(&spu->register_lock);
134         return ret;
135 }
136 
137 static void spu_hw_signal1_write(struct spu_context *ctx, u32 data)
138 {
139         out_be32(&ctx->spu->problem->signal_notify1, data);
140 }
141 
142 static void spu_hw_signal2_write(struct spu_context *ctx, u32 data)
143 {
144         out_be32(&ctx->spu->problem->signal_notify2, data);
145 }
146 
147 static void spu_hw_signal1_type_set(struct spu_context *ctx, u64 val)
148 {
149         struct spu *spu = ctx->spu;
150         struct spu_priv2 __iomem *priv2 = spu->priv2;
151         u64 tmp;
152 
153         spin_lock_irq(&spu->register_lock);
154         tmp = in_be64(&priv2->spu_cfg_RW);
155         if (val)
156                 tmp |= 1;
157         else
158                 tmp &= ~1;
159         out_be64(&priv2->spu_cfg_RW, tmp);
160         spin_unlock_irq(&spu->register_lock);
161 }
162 
163 static u64 spu_hw_signal1_type_get(struct spu_context *ctx)
164 {
165         return ((in_be64(&ctx->spu->priv2->spu_cfg_RW) & 1) != 0);
166 }
167 
168 static void spu_hw_signal2_type_set(struct spu_context *ctx, u64 val)
169 {
170         struct spu *spu = ctx->spu;
171         struct spu_priv2 __iomem *priv2 = spu->priv2;
172         u64 tmp;
173 
174         spin_lock_irq(&spu->register_lock);
175         tmp = in_be64(&priv2->spu_cfg_RW);
176         if (val)
177                 tmp |= 2;
178         else
179                 tmp &= ~2;
180         out_be64(&priv2->spu_cfg_RW, tmp);
181         spin_unlock_irq(&spu->register_lock);
182 }
183 
184 static u64 spu_hw_signal2_type_get(struct spu_context *ctx)
185 {
186         return ((in_be64(&ctx->spu->priv2->spu_cfg_RW) & 2) != 0);
187 }
188 
189 static u32 spu_hw_npc_read(struct spu_context *ctx)
190 {
191         return in_be32(&ctx->spu->problem->spu_npc_RW);
192 }
193 
194 static void spu_hw_npc_write(struct spu_context *ctx, u32 val)
195 {
196         out_be32(&ctx->spu->problem->spu_npc_RW, val);
197 }
198 
199 static u32 spu_hw_status_read(struct spu_context *ctx)
200 {
201         return in_be32(&ctx->spu->problem->spu_status_R);
202 }
203 
204 static char *spu_hw_get_ls(struct spu_context *ctx)
205 {
206         return ctx->spu->local_store;
207 }
208 
209 static void spu_hw_privcntl_write(struct spu_context *ctx, u64 val)
210 {
211         out_be64(&ctx->spu->priv2->spu_privcntl_RW, val);
212 }
213 
214 static u32 spu_hw_runcntl_read(struct spu_context *ctx)
215 {
216         return in_be32(&ctx->spu->problem->spu_runcntl_RW);
217 }
218 
219 static void spu_hw_runcntl_write(struct spu_context *ctx, u32 val)
220 {
221         spin_lock_irq(&ctx->spu->register_lock);
222         if (val & SPU_RUNCNTL_ISOLATE)
223                 spu_hw_privcntl_write(ctx,
224                         SPU_PRIVCNT_LOAD_REQUEST_ENABLE_MASK);
225         out_be32(&ctx->spu->problem->spu_runcntl_RW, val);
226         spin_unlock_irq(&ctx->spu->register_lock);
227 }
228 
229 static void spu_hw_runcntl_stop(struct spu_context *ctx)
230 {
231         spin_lock_irq(&ctx->spu->register_lock);
232         out_be32(&ctx->spu->problem->spu_runcntl_RW, SPU_RUNCNTL_STOP);
233         while (in_be32(&ctx->spu->problem->spu_status_R) & SPU_STATUS_RUNNING)
234                 cpu_relax();
235         spin_unlock_irq(&ctx->spu->register_lock);
236 }
237 
238 static void spu_hw_master_start(struct spu_context *ctx)
239 {
240         struct spu *spu = ctx->spu;
241         u64 sr1;
242 
243         spin_lock_irq(&spu->register_lock);
244         sr1 = spu_mfc_sr1_get(spu) | MFC_STATE1_MASTER_RUN_CONTROL_MASK;
245         spu_mfc_sr1_set(spu, sr1);
246         spin_unlock_irq(&spu->register_lock);
247 }
248 
249 static void spu_hw_master_stop(struct spu_context *ctx)
250 {
251         struct spu *spu = ctx->spu;
252         u64 sr1;
253 
254         spin_lock_irq(&spu->register_lock);
255         sr1 = spu_mfc_sr1_get(spu) & ~MFC_STATE1_MASTER_RUN_CONTROL_MASK;
256         spu_mfc_sr1_set(spu, sr1);
257         spin_unlock_irq(&spu->register_lock);
258 }
259 
260 static int spu_hw_set_mfc_query(struct spu_context * ctx, u32 mask, u32 mode)
261 {
262         struct spu_problem __iomem *prob = ctx->spu->problem;
263         int ret;
264 
265         spin_lock_irq(&ctx->spu->register_lock);
266         ret = -EAGAIN;
267         if (in_be32(&prob->dma_querytype_RW))
268                 goto out;
269         ret = 0;
270         out_be32(&prob->dma_querymask_RW, mask);
271         out_be32(&prob->dma_querytype_RW, mode);
272 out:
273         spin_unlock_irq(&ctx->spu->register_lock);
274         return ret;
275 }
276 
277 static u32 spu_hw_read_mfc_tagstatus(struct spu_context * ctx)
278 {
279         return in_be32(&ctx->spu->problem->dma_tagstatus_R);
280 }
281 
282 static u32 spu_hw_get_mfc_free_elements(struct spu_context *ctx)
283 {
284         return in_be32(&ctx->spu->problem->dma_qstatus_R);
285 }
286 
287 static int spu_hw_send_mfc_command(struct spu_context *ctx,
288                                         struct mfc_dma_command *cmd)
289 {
290         u32 status;
291         struct spu_problem __iomem *prob = ctx->spu->problem;
292 
293         spin_lock_irq(&ctx->spu->register_lock);
294         out_be32(&prob->mfc_lsa_W, cmd->lsa);
295         out_be64(&prob->mfc_ea_W, cmd->ea);
296         out_be32(&prob->mfc_union_W.by32.mfc_size_tag32,
297                                 cmd->size << 16 | cmd->tag);
298         out_be32(&prob->mfc_union_W.by32.mfc_class_cmd32,
299                                 cmd->class << 16 | cmd->cmd);
300         status = in_be32(&prob->mfc_union_W.by32.mfc_class_cmd32);
301         spin_unlock_irq(&ctx->spu->register_lock);
302 
303         switch (status & 0xffff) {
304         case 0:
305                 return 0;
306         case 2:
307                 return -EAGAIN;
308         default:
309                 return -EINVAL;
310         }
311 }
312 
313 static void spu_hw_restart_dma(struct spu_context *ctx)
314 {
315         struct spu_priv2 __iomem *priv2 = ctx->spu->priv2;
316 
317         if (!test_bit(SPU_CONTEXT_SWITCH_PENDING, &ctx->spu->flags))
318                 out_be64(&priv2->mfc_control_RW, MFC_CNTL_RESTART_DMA_COMMAND);
319 }
320 
321 struct spu_context_ops spu_hw_ops = {
322         .mbox_read = spu_hw_mbox_read,
323         .mbox_stat_read = spu_hw_mbox_stat_read,
324         .mbox_stat_poll = spu_hw_mbox_stat_poll,
325         .ibox_read = spu_hw_ibox_read,
326         .wbox_write = spu_hw_wbox_write,
327         .signal1_write = spu_hw_signal1_write,
328         .signal2_write = spu_hw_signal2_write,
329         .signal1_type_set = spu_hw_signal1_type_set,
330         .signal1_type_get = spu_hw_signal1_type_get,
331         .signal2_type_set = spu_hw_signal2_type_set,
332         .signal2_type_get = spu_hw_signal2_type_get,
333         .npc_read = spu_hw_npc_read,
334         .npc_write = spu_hw_npc_write,
335         .status_read = spu_hw_status_read,
336         .get_ls = spu_hw_get_ls,
337         .privcntl_write = spu_hw_privcntl_write,
338         .runcntl_read = spu_hw_runcntl_read,
339         .runcntl_write = spu_hw_runcntl_write,
340         .runcntl_stop = spu_hw_runcntl_stop,
341         .master_start = spu_hw_master_start,
342         .master_stop = spu_hw_master_stop,
343         .set_mfc_query = spu_hw_set_mfc_query,
344         .read_mfc_tagstatus = spu_hw_read_mfc_tagstatus,
345         .get_mfc_free_elements = spu_hw_get_mfc_free_elements,
346         .send_mfc_command = spu_hw_send_mfc_command,
347         .restart_dma = spu_hw_restart_dma,
348 };
349 

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