1 /* backing_ops.c - query/set operations on saved SPU context.
3 * Copyright (C) IBM 2005
4 * Author: Mark Nutter <mnutter@us.ibm.com>
6 * These register operations allow SPUFS to operate on saved
7 * SPU contexts rather than hardware.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/module.h>
25 #include <linux/errno.h>
26 #include <linux/sched.h>
27 #include <linux/kernel.h>
29 #include <linux/vmalloc.h>
30 #include <linux/smp.h>
31 #include <linux/smp_lock.h>
32 #include <linux/stddef.h>
33 #include <linux/unistd.h>
34 #include <linux/poll.h>
38 #include <asm/spu_csa.h>
39 #include <asm/mmu_context.h>
43 * Reads/writes to various problem and priv2 registers require
44 * state changes, i.e. generate SPU events, modify channel
48 static void gen_spu_event(struct spu_context *ctx, u32 event)
54 ch0_cnt = ctx->csa.spu_chnlcnt_RW[0];
55 ch0_data = ctx->csa.spu_chnldata_RW[0];
56 ch1_data = ctx->csa.spu_chnldata_RW[1];
57 ctx->csa.spu_chnldata_RW[0] |= event;
58 if ((ch0_cnt == 0) && !(ch0_data & event) && (ch1_data & event)) {
59 ctx->csa.spu_chnlcnt_RW[0] = 1;
63 static int spu_backing_mbox_read(struct spu_context *ctx, u32 * data)
68 spin_lock(&ctx->csa.register_lock);
69 mbox_stat = ctx->csa.prob.mb_stat_R;
70 if (mbox_stat & 0x0000ff) {
71 /* Read the first available word.
72 * Implementation note: the depth
73 * of pu_mb_R is currently 1.
75 *data = ctx->csa.prob.pu_mb_R;
76 ctx->csa.prob.mb_stat_R &= ~(0x0000ff);
77 ctx->csa.spu_chnlcnt_RW[28] = 1;
78 gen_spu_event(ctx, MFC_PU_MAILBOX_AVAILABLE_EVENT);
81 spin_unlock(&ctx->csa.register_lock);
85 static u32 spu_backing_mbox_stat_read(struct spu_context *ctx)
87 return ctx->csa.prob.mb_stat_R;
90 static unsigned int spu_backing_mbox_stat_poll(struct spu_context *ctx,
97 spin_lock_irq(&ctx->csa.register_lock);
98 stat = ctx->csa.prob.mb_stat_R;
100 /* if the requested event is there, return the poll
101 mask, otherwise enable the interrupt to get notified,
102 but first mark any pending interrupts as done so
103 we don't get woken up unnecessarily */
105 if (events & (POLLIN | POLLRDNORM)) {
107 ret |= POLLIN | POLLRDNORM;
109 ctx->csa.priv1.int_stat_class0_RW &= ~0x1;
110 ctx->csa.priv1.int_mask_class2_RW |= 0x1;
113 if (events & (POLLOUT | POLLWRNORM)) {
115 ret = POLLOUT | POLLWRNORM;
117 ctx->csa.priv1.int_stat_class0_RW &= ~0x10;
118 ctx->csa.priv1.int_mask_class2_RW |= 0x10;
121 spin_unlock_irq(&ctx->csa.register_lock);
125 static int spu_backing_ibox_read(struct spu_context *ctx, u32 * data)
129 spin_lock(&ctx->csa.register_lock);
130 if (ctx->csa.prob.mb_stat_R & 0xff0000) {
131 /* Read the first available word.
132 * Implementation note: the depth
133 * of puint_mb_R is currently 1.
135 *data = ctx->csa.priv2.puint_mb_R;
136 ctx->csa.prob.mb_stat_R &= ~(0xff0000);
137 ctx->csa.spu_chnlcnt_RW[30] = 1;
138 gen_spu_event(ctx, MFC_PU_INT_MAILBOX_AVAILABLE_EVENT);
141 /* make sure we get woken up by the interrupt */
142 ctx->csa.priv1.int_mask_class2_RW |= 0x1UL;
145 spin_unlock(&ctx->csa.register_lock);
149 static int spu_backing_wbox_write(struct spu_context *ctx, u32 data)
153 spin_lock(&ctx->csa.register_lock);
154 if ((ctx->csa.prob.mb_stat_R) & 0x00ff00) {
155 int slot = ctx->csa.spu_chnlcnt_RW[29];
156 int avail = (ctx->csa.prob.mb_stat_R & 0x00ff00) >> 8;
158 /* We have space to write wbox_data.
159 * Implementation note: the depth
160 * of spu_mb_W is currently 4.
162 BUG_ON(avail != (4 - slot));
163 ctx->csa.spu_mailbox_data[slot] = data;
164 ctx->csa.spu_chnlcnt_RW[29] = ++slot;
165 ctx->csa.prob.mb_stat_R = (((4 - slot) & 0xff) << 8);
166 gen_spu_event(ctx, MFC_SPU_MAILBOX_WRITTEN_EVENT);
169 /* make sure we get woken up by the interrupt when space
171 ctx->csa.priv1.int_mask_class2_RW |= 0x10;
174 spin_unlock(&ctx->csa.register_lock);
178 static u32 spu_backing_signal1_read(struct spu_context *ctx)
180 return ctx->csa.spu_chnldata_RW[3];
183 static void spu_backing_signal1_write(struct spu_context *ctx, u32 data)
185 spin_lock(&ctx->csa.register_lock);
186 if (ctx->csa.priv2.spu_cfg_RW & 0x1)
187 ctx->csa.spu_chnldata_RW[3] |= data;
189 ctx->csa.spu_chnldata_RW[3] = data;
190 ctx->csa.spu_chnlcnt_RW[3] = 1;
191 gen_spu_event(ctx, MFC_SIGNAL_1_EVENT);
192 spin_unlock(&ctx->csa.register_lock);
195 static u32 spu_backing_signal2_read(struct spu_context *ctx)
197 return ctx->csa.spu_chnldata_RW[4];
200 static void spu_backing_signal2_write(struct spu_context *ctx, u32 data)
202 spin_lock(&ctx->csa.register_lock);
203 if (ctx->csa.priv2.spu_cfg_RW & 0x2)
204 ctx->csa.spu_chnldata_RW[4] |= data;
206 ctx->csa.spu_chnldata_RW[4] = data;
207 ctx->csa.spu_chnlcnt_RW[4] = 1;
208 gen_spu_event(ctx, MFC_SIGNAL_2_EVENT);
209 spin_unlock(&ctx->csa.register_lock);
212 static void spu_backing_signal1_type_set(struct spu_context *ctx, u64 val)
216 spin_lock(&ctx->csa.register_lock);
217 tmp = ctx->csa.priv2.spu_cfg_RW;
222 ctx->csa.priv2.spu_cfg_RW = tmp;
223 spin_unlock(&ctx->csa.register_lock);
226 static u64 spu_backing_signal1_type_get(struct spu_context *ctx)
228 return ((ctx->csa.priv2.spu_cfg_RW & 1) != 0);
231 static void spu_backing_signal2_type_set(struct spu_context *ctx, u64 val)
235 spin_lock(&ctx->csa.register_lock);
236 tmp = ctx->csa.priv2.spu_cfg_RW;
241 ctx->csa.priv2.spu_cfg_RW = tmp;
242 spin_unlock(&ctx->csa.register_lock);
245 static u64 spu_backing_signal2_type_get(struct spu_context *ctx)
247 return ((ctx->csa.priv2.spu_cfg_RW & 2) != 0);
250 static u32 spu_backing_npc_read(struct spu_context *ctx)
252 return ctx->csa.prob.spu_npc_RW;
255 static void spu_backing_npc_write(struct spu_context *ctx, u32 val)
257 ctx->csa.prob.spu_npc_RW = val;
260 static u32 spu_backing_status_read(struct spu_context *ctx)
262 return ctx->csa.prob.spu_status_R;
265 static char *spu_backing_get_ls(struct spu_context *ctx)
267 return ctx->csa.lscsa->ls;
270 static void spu_backing_runcntl_write(struct spu_context *ctx, u32 val)
272 spin_lock(&ctx->csa.register_lock);
273 ctx->csa.prob.spu_runcntl_RW = val;
274 if (val & SPU_RUNCNTL_RUNNABLE) {
275 ctx->csa.prob.spu_status_R |= SPU_STATUS_RUNNING;
277 ctx->csa.prob.spu_status_R &= ~SPU_STATUS_RUNNING;
279 spin_unlock(&ctx->csa.register_lock);
282 static void spu_backing_runcntl_stop(struct spu_context *ctx)
284 spu_backing_runcntl_write(ctx, SPU_RUNCNTL_STOP);
287 static int spu_backing_set_mfc_query(struct spu_context * ctx, u32 mask,
290 struct spu_problem_collapsed *prob = &ctx->csa.prob;
293 spin_lock(&ctx->csa.register_lock);
295 if (prob->dma_querytype_RW)
298 /* FIXME: what are the side-effects of this? */
299 prob->dma_querymask_RW = mask;
300 prob->dma_querytype_RW = mode;
302 spin_unlock(&ctx->csa.register_lock);
307 static u32 spu_backing_read_mfc_tagstatus(struct spu_context * ctx)
309 return ctx->csa.prob.dma_tagstatus_R;
312 static u32 spu_backing_get_mfc_free_elements(struct spu_context *ctx)
314 return ctx->csa.prob.dma_qstatus_R;
317 static int spu_backing_send_mfc_command(struct spu_context *ctx,
318 struct mfc_dma_command *cmd)
322 spin_lock(&ctx->csa.register_lock);
324 /* FIXME: set up priv2->puq */
325 spin_unlock(&ctx->csa.register_lock);
330 struct spu_context_ops spu_backing_ops = {
331 .mbox_read = spu_backing_mbox_read,
332 .mbox_stat_read = spu_backing_mbox_stat_read,
333 .mbox_stat_poll = spu_backing_mbox_stat_poll,
334 .ibox_read = spu_backing_ibox_read,
335 .wbox_write = spu_backing_wbox_write,
336 .signal1_read = spu_backing_signal1_read,
337 .signal1_write = spu_backing_signal1_write,
338 .signal2_read = spu_backing_signal2_read,
339 .signal2_write = spu_backing_signal2_write,
340 .signal1_type_set = spu_backing_signal1_type_set,
341 .signal1_type_get = spu_backing_signal1_type_get,
342 .signal2_type_set = spu_backing_signal2_type_set,
343 .signal2_type_get = spu_backing_signal2_type_get,
344 .npc_read = spu_backing_npc_read,
345 .npc_write = spu_backing_npc_write,
346 .status_read = spu_backing_status_read,
347 .get_ls = spu_backing_get_ls,
348 .runcntl_write = spu_backing_runcntl_write,
349 .runcntl_stop = spu_backing_runcntl_stop,
350 .set_mfc_query = spu_backing_set_mfc_query,
351 .read_mfc_tagstatus = spu_backing_read_mfc_tagstatus,
352 .get_mfc_free_elements = spu_backing_get_mfc_free_elements,
353 .send_mfc_command = spu_backing_send_mfc_command,