blob: 4ce93aa7b37259f24299791a7a793230de5a79a6 [file] [log] [blame]
Ralf Baechlee01402b2005-07-14 15:57:16 +00001/*
2 * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
Ralf Baechlea84c96e2006-01-15 18:11:28 +00003 * Copyright (C) 2005, 06 Ralf Baechle (ralf@linux-mips.org)
Ralf Baechlee01402b2005-07-14 15:57:16 +00004 *
5 * This program is free software; you can distribute it and/or modify it
6 * under the terms of the GNU General Public License (Version 2) as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
17 *
18 */
19
Ralf Baechlebb3d7c72007-02-07 15:36:56 +000020#include <linux/device.h>
Ralf Baechlee01402b2005-07-14 15:57:16 +000021#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/fs.h>
24#include <linux/init.h>
Ralf Baechle26009902006-04-05 09:45:45 +010025#include <asm/uaccess.h>
26#include <linux/slab.h>
27#include <linux/list.h>
28#include <linux/vmalloc.h>
29#include <linux/elf.h>
30#include <linux/seq_file.h>
Jonathan Corbet7558da92008-05-15 09:10:50 -060031#include <linux/smp_lock.h>
Ralf Baechle26009902006-04-05 09:45:45 +010032#include <linux/syscalls.h>
33#include <linux/moduleloader.h>
Ralf Baechlea84c96e2006-01-15 18:11:28 +000034#include <linux/interrupt.h>
Ralf Baechlee01402b2005-07-14 15:57:16 +000035#include <linux/poll.h>
36#include <linux/sched.h>
37#include <linux/wait.h>
38#include <asm/mipsmtregs.h>
Ralf Baechlebb3d7c72007-02-07 15:36:56 +000039#include <asm/mips_mt.h>
Ralf Baechle26009902006-04-05 09:45:45 +010040#include <asm/cacheflush.h>
41#include <asm/atomic.h>
Ralf Baechlee01402b2005-07-14 15:57:16 +000042#include <asm/cpu.h>
43#include <asm/processor.h>
Ralf Baechle26009902006-04-05 09:45:45 +010044#include <asm/system.h>
45#include <asm/vpe.h>
Ralf Baechlee01402b2005-07-14 15:57:16 +000046#include <asm/rtlx.h>
47
Ralf Baechleafc48412005-10-31 00:30:39 +000048static struct rtlx_info *rtlx;
Ralf Baechlee01402b2005-07-14 15:57:16 +000049static int major;
50static char module_name[] = "rtlx";
Ralf Baechlee01402b2005-07-14 15:57:16 +000051
52static struct chan_waitqueues {
53 wait_queue_head_t rt_queue;
54 wait_queue_head_t lx_queue;
Ralf Baechlec4c40182007-02-23 13:40:45 +000055 atomic_t in_open;
Ralf Baechlebc4809e2007-03-15 17:13:47 +000056 struct mutex mutex;
Ralf Baechlee01402b2005-07-14 15:57:16 +000057} channel_wqs[RTLX_CHANNELS];
58
Ralf Baechle26009902006-04-05 09:45:45 +010059static struct vpe_notifications notify;
60static int sp_stopping = 0;
61
Ralf Baechlee01402b2005-07-14 15:57:16 +000062extern void *vpe_get_shared(int index);
63
Ralf Baechle937a8012006-10-07 19:44:33 +010064static void rtlx_dispatch(void)
Ralf Baechlee01402b2005-07-14 15:57:16 +000065{
Atsushi Nemoto97dcb822007-01-08 02:14:29 +090066 do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ);
Ralf Baechlee01402b2005-07-14 15:57:16 +000067}
68
Ralf Baechle26009902006-04-05 09:45:45 +010069
70/* Interrupt handler may be called before rtlx_init has otherwise had
71 a chance to run.
72*/
Ralf Baechle937a8012006-10-07 19:44:33 +010073static irqreturn_t rtlx_interrupt(int irq, void *dev_id)
Ralf Baechlee01402b2005-07-14 15:57:16 +000074{
Ralf Baechlee01402b2005-07-14 15:57:16 +000075 int i;
Kevin D. Kissell1928cc82008-04-16 15:32:22 +020076 unsigned int flags, vpeflags;
77
78 /* Ought not to be strictly necessary for SMTC builds */
79 local_irq_save(flags);
80 vpeflags = dvpe();
81 set_c0_status(0x100 << MIPS_CPU_RTLX_IRQ);
82 irq_enable_hazard();
83 evpe(vpeflags);
84 local_irq_restore(flags);
Ralf Baechlee01402b2005-07-14 15:57:16 +000085
86 for (i = 0; i < RTLX_CHANNELS; i++) {
Ralf Baechle26009902006-04-05 09:45:45 +010087 wake_up(&channel_wqs[i].lx_queue);
88 wake_up(&channel_wqs[i].rt_queue);
Ralf Baechlee01402b2005-07-14 15:57:16 +000089 }
90
Ralf Baechleafc48412005-10-31 00:30:39 +000091 return IRQ_HANDLED;
Ralf Baechlee01402b2005-07-14 15:57:16 +000092}
93
David Rientjesf5dbeaf2007-07-22 01:01:39 -070094static void __used dump_rtlx(void)
Ralf Baechlee01402b2005-07-14 15:57:16 +000095{
96 int i;
97
Ralf Baechle26009902006-04-05 09:45:45 +010098 printk("id 0x%lx state %d\n", rtlx->id, rtlx->state);
99
100 for (i = 0; i < RTLX_CHANNELS; i++) {
101 struct rtlx_channel *chan = &rtlx->channel[i];
102
103 printk(" rt_state %d lx_state %d buffer_size %d\n",
104 chan->rt_state, chan->lx_state, chan->buffer_size);
105
106 printk(" rt_read %d rt_write %d\n",
107 chan->rt_read, chan->rt_write);
108
109 printk(" lx_read %d lx_write %d\n",
110 chan->lx_read, chan->lx_write);
111
112 printk(" rt_buffer <%s>\n", chan->rt_buffer);
113 printk(" lx_buffer <%s>\n", chan->lx_buffer);
114 }
115}
116
117/* call when we have the address of the shared structure from the SP side. */
118static int rtlx_init(struct rtlx_info *rtlxi)
119{
Ralf Baechlee01402b2005-07-14 15:57:16 +0000120 if (rtlxi->id != RTLX_ID) {
Kevin D. Kissell1928cc82008-04-16 15:32:22 +0200121 printk(KERN_ERR "no valid RTLX id at 0x%p 0x%lx\n",
122 rtlxi, rtlxi->id);
Ralf Baechleafc48412005-10-31 00:30:39 +0000123 return -ENOEXEC;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000124 }
125
Ralf Baechlee01402b2005-07-14 15:57:16 +0000126 rtlx = rtlxi;
Ralf Baechleafc48412005-10-31 00:30:39 +0000127
128 return 0;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000129}
130
Ralf Baechle26009902006-04-05 09:45:45 +0100131/* notifications */
132static void starting(int vpe)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000133{
Ralf Baechle26009902006-04-05 09:45:45 +0100134 int i;
135 sp_stopping = 0;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000136
Ralf Baechle26009902006-04-05 09:45:45 +0100137 /* force a reload of rtlx */
138 rtlx=NULL;
139
140 /* wake up any sleeping rtlx_open's */
141 for (i = 0; i < RTLX_CHANNELS; i++)
142 wake_up_interruptible(&channel_wqs[i].lx_queue);
143}
144
145static void stopping(int vpe)
146{
147 int i;
148
149 sp_stopping = 1;
150 for (i = 0; i < RTLX_CHANNELS; i++)
151 wake_up_interruptible(&channel_wqs[i].lx_queue);
152}
153
154
155int rtlx_open(int index, int can_sleep)
156{
Ralf Baechle9e346822007-03-15 17:08:28 +0000157 struct rtlx_info **p;
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000158 struct rtlx_channel *chan;
Ralf Baechlec4c40182007-02-23 13:40:45 +0000159 enum rtlx_state state;
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000160 int ret = 0;
Ralf Baechle26009902006-04-05 09:45:45 +0100161
162 if (index >= RTLX_CHANNELS) {
163 printk(KERN_DEBUG "rtlx_open index out of range\n");
164 return -ENOSYS;
165 }
166
Ralf Baechlec4c40182007-02-23 13:40:45 +0000167 if (atomic_inc_return(&channel_wqs[index].in_open) > 1) {
168 printk(KERN_DEBUG "rtlx_open channel %d already opened\n",
169 index);
170 ret = -EBUSY;
171 goto out_fail;
Ralf Baechle26009902006-04-05 09:45:45 +0100172 }
173
Ralf Baechlee01402b2005-07-14 15:57:16 +0000174 if (rtlx == NULL) {
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100175 if( (p = vpe_get_shared(tclimit)) == NULL) {
Kevin D. Kissell1928cc82008-04-16 15:32:22 +0200176 if (can_sleep) {
177 __wait_event_interruptible(channel_wqs[index].lx_queue,
178 (p = vpe_get_shared(tclimit)), ret);
179 if (ret)
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000180 goto out_fail;
Kevin D. Kissell1928cc82008-04-16 15:32:22 +0200181 } else {
182 printk(KERN_DEBUG "No SP program loaded, and device "
183 "opened with O_NONBLOCK\n");
184 ret = -ENOSYS;
185 goto out_fail;
186 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000187 }
188
Ralf Baechle9e346822007-03-15 17:08:28 +0000189 smp_rmb();
Ralf Baechlee01402b2005-07-14 15:57:16 +0000190 if (*p == NULL) {
Ralf Baechle26009902006-04-05 09:45:45 +0100191 if (can_sleep) {
Ralf Baechle9e346822007-03-15 17:08:28 +0000192 DEFINE_WAIT(wait);
193
194 for (;;) {
Kevin D. Kissell1928cc82008-04-16 15:32:22 +0200195 prepare_to_wait(
196 &channel_wqs[index].lx_queue,
197 &wait, TASK_INTERRUPTIBLE);
Ralf Baechle9e346822007-03-15 17:08:28 +0000198 smp_rmb();
199 if (*p != NULL)
200 break;
201 if (!signal_pending(current)) {
202 schedule();
203 continue;
204 }
205 ret = -ERESTARTSYS;
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000206 goto out_fail;
Ralf Baechle9e346822007-03-15 17:08:28 +0000207 }
208 finish_wait(&channel_wqs[index].lx_queue, &wait);
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000209 } else {
Kevin D. Kissell1928cc82008-04-16 15:32:22 +0200210 pr_err(" *vpe_get_shared is NULL. "
Ralf Baechle26009902006-04-05 09:45:45 +0100211 "Has an SP program been loaded?\n");
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000212 ret = -ENOSYS;
213 goto out_fail;
Ralf Baechle26009902006-04-05 09:45:45 +0100214 }
Ralf Baechlee01402b2005-07-14 15:57:16 +0000215 }
216
Ralf Baechle26009902006-04-05 09:45:45 +0100217 if ((unsigned int)*p < KSEG0) {
Kevin D. Kissell1928cc82008-04-16 15:32:22 +0200218 printk(KERN_WARNING "vpe_get_shared returned an "
219 "invalid pointer maybe an error code %d\n",
220 (int)*p);
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000221 ret = -ENOSYS;
222 goto out_fail;
Ralf Baechle26009902006-04-05 09:45:45 +0100223 }
224
Ralf Baechlec4c40182007-02-23 13:40:45 +0000225 if ((ret = rtlx_init(*p)) < 0)
226 goto out_ret;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000227 }
228
Ralf Baechle26009902006-04-05 09:45:45 +0100229 chan = &rtlx->channel[index];
Ralf Baechlee01402b2005-07-14 15:57:16 +0000230
Ralf Baechlec4c40182007-02-23 13:40:45 +0000231 state = xchg(&chan->lx_state, RTLX_STATE_OPENED);
232 if (state == RTLX_STATE_OPENED) {
233 ret = -EBUSY;
234 goto out_fail;
235 }
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000236
237out_fail:
Ralf Baechlec4c40182007-02-23 13:40:45 +0000238 smp_mb();
239 atomic_dec(&channel_wqs[index].in_open);
240 smp_mb();
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000241
Ralf Baechlec4c40182007-02-23 13:40:45 +0000242out_ret:
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000243 return ret;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000244}
245
Ralf Baechle26009902006-04-05 09:45:45 +0100246int rtlx_release(int index)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000247{
Kevin D. Kissell1928cc82008-04-16 15:32:22 +0200248 if (rtlx == NULL) {
249 pr_err("rtlx_release() with null rtlx\n");
250 return 0;
251 }
Ralf Baechle26009902006-04-05 09:45:45 +0100252 rtlx->channel[index].lx_state = RTLX_STATE_UNUSED;
Ralf Baechleafc48412005-10-31 00:30:39 +0000253 return 0;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000254}
255
Ralf Baechle26009902006-04-05 09:45:45 +0100256unsigned int rtlx_read_poll(int index, int can_sleep)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000257{
Ralf Baechle26009902006-04-05 09:45:45 +0100258 struct rtlx_channel *chan;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000259
Ralf Baechle26009902006-04-05 09:45:45 +0100260 if (rtlx == NULL)
261 return 0;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000262
Ralf Baechle26009902006-04-05 09:45:45 +0100263 chan = &rtlx->channel[index];
Ralf Baechlee01402b2005-07-14 15:57:16 +0000264
265 /* data available to read? */
Ralf Baechle26009902006-04-05 09:45:45 +0100266 if (chan->lx_read == chan->lx_write) {
267 if (can_sleep) {
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000268 int ret = 0;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000269
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000270 __wait_event_interruptible(channel_wqs[index].lx_queue,
Kevin D. Kissell1928cc82008-04-16 15:32:22 +0200271 (chan->lx_read != chan->lx_write) ||
272 sp_stopping, ret);
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000273 if (ret)
274 return ret;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000275
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000276 if (sp_stopping)
277 return 0;
278 } else
Ralf Baechle26009902006-04-05 09:45:45 +0100279 return 0;
280 }
281
282 return (chan->lx_write + chan->buffer_size - chan->lx_read)
283 % chan->buffer_size;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000284}
285
Ralf Baechle26009902006-04-05 09:45:45 +0100286static inline int write_spacefree(int read, int write, int size)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000287{
Ralf Baechle26009902006-04-05 09:45:45 +0100288 if (read == write) {
289 /*
290 * Never fill the buffer completely, so indexes are always
291 * equal if empty and only empty, or !equal if data available
292 */
293 return size - 1;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000294 }
295
Ralf Baechle26009902006-04-05 09:45:45 +0100296 return ((read + size - write) % size) - 1;
297}
298
299unsigned int rtlx_write_poll(int index)
300{
301 struct rtlx_channel *chan = &rtlx->channel[index];
Kevin D. Kissell1928cc82008-04-16 15:32:22 +0200302
303 return write_spacefree(chan->rt_read, chan->rt_write,
304 chan->buffer_size);
Ralf Baechle26009902006-04-05 09:45:45 +0100305}
306
Ralf Baechle7f5a7712007-04-25 15:08:57 +0100307ssize_t rtlx_read(int index, void __user *buff, size_t count)
Ralf Baechle26009902006-04-05 09:45:45 +0100308{
Ralf Baechle61dcc6f2007-03-15 17:10:16 +0000309 size_t lx_write, fl = 0L;
Ralf Baechle26009902006-04-05 09:45:45 +0100310 struct rtlx_channel *lx;
Ralf Baechle46230aa2007-03-16 12:16:27 +0000311 unsigned long failed;
Ralf Baechle26009902006-04-05 09:45:45 +0100312
313 if (rtlx == NULL)
314 return -ENOSYS;
315
316 lx = &rtlx->channel[index];
317
Ralf Baechlebc4809e2007-03-15 17:13:47 +0000318 mutex_lock(&channel_wqs[index].mutex);
Ralf Baechle61dcc6f2007-03-15 17:10:16 +0000319 smp_rmb();
320 lx_write = lx->lx_write;
321
Ralf Baechlee01402b2005-07-14 15:57:16 +0000322 /* find out how much in total */
Ralf Baechleafc48412005-10-31 00:30:39 +0000323 count = min(count,
Ralf Baechle61dcc6f2007-03-15 17:10:16 +0000324 (size_t)(lx_write + lx->buffer_size - lx->lx_read)
Ralf Baechle26009902006-04-05 09:45:45 +0100325 % lx->buffer_size);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000326
327 /* then how much from the read pointer onwards */
Ralf Baechle61dcc6f2007-03-15 17:10:16 +0000328 fl = min(count, (size_t)lx->buffer_size - lx->lx_read);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000329
Ralf Baechle46230aa2007-03-16 12:16:27 +0000330 failed = copy_to_user(buff, lx->lx_buffer + lx->lx_read, fl);
331 if (failed)
332 goto out;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000333
334 /* and if there is anything left at the beginning of the buffer */
Ralf Baechle61dcc6f2007-03-15 17:10:16 +0000335 if (count - fl)
Ralf Baechle46230aa2007-03-16 12:16:27 +0000336 failed = copy_to_user(buff + fl, lx->lx_buffer, count - fl);
337
338out:
339 count -= failed;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000340
Ralf Baechle61dcc6f2007-03-15 17:10:16 +0000341 smp_wmb();
342 lx->lx_read = (lx->lx_read + count) % lx->buffer_size;
343 smp_wmb();
Ralf Baechlebc4809e2007-03-15 17:13:47 +0000344 mutex_unlock(&channel_wqs[index].mutex);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000345
Ralf Baechleafc48412005-10-31 00:30:39 +0000346 return count;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000347}
348
Ralf Baechle7f5a7712007-04-25 15:08:57 +0100349ssize_t rtlx_write(int index, const void __user *buffer, size_t count)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000350{
Ralf Baechlee01402b2005-07-14 15:57:16 +0000351 struct rtlx_channel *rt;
Ralf Baechle7f5a7712007-04-25 15:08:57 +0100352 unsigned long failed;
Ralf Baechle61dcc6f2007-03-15 17:10:16 +0000353 size_t rt_read;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000354 size_t fl;
Ralf Baechle26009902006-04-05 09:45:45 +0100355
356 if (rtlx == NULL)
357 return(-ENOSYS);
358
359 rt = &rtlx->channel[index];
360
Ralf Baechlebc4809e2007-03-15 17:13:47 +0000361 mutex_lock(&channel_wqs[index].mutex);
Ralf Baechle61dcc6f2007-03-15 17:10:16 +0000362 smp_rmb();
363 rt_read = rt->rt_read;
364
Ralf Baechle26009902006-04-05 09:45:45 +0100365 /* total number of bytes to copy */
Kevin D. Kissell1928cc82008-04-16 15:32:22 +0200366 count = min(count, (size_t)write_spacefree(rt_read, rt->rt_write,
367 rt->buffer_size));
Ralf Baechle26009902006-04-05 09:45:45 +0100368
369 /* first bit from write pointer to the end of the buffer, or count */
370 fl = min(count, (size_t) rt->buffer_size - rt->rt_write);
371
Ralf Baechle46230aa2007-03-16 12:16:27 +0000372 failed = copy_from_user(rt->rt_buffer + rt->rt_write, buffer, fl);
373 if (failed)
374 goto out;
Ralf Baechle26009902006-04-05 09:45:45 +0100375
376 /* if there's any left copy to the beginning of the buffer */
Ralf Baechle46230aa2007-03-16 12:16:27 +0000377 if (count - fl) {
378 failed = copy_from_user(rt->rt_buffer, buffer + fl, count - fl);
379 }
380
381out:
Ralf Baechle7f5a7712007-04-25 15:08:57 +0100382 count -= failed;
Ralf Baechle26009902006-04-05 09:45:45 +0100383
Ralf Baechle61dcc6f2007-03-15 17:10:16 +0000384 smp_wmb();
385 rt->rt_write = (rt->rt_write + count) % rt->buffer_size;
386 smp_wmb();
Ralf Baechlebc4809e2007-03-15 17:13:47 +0000387 mutex_unlock(&channel_wqs[index].mutex);
Ralf Baechle26009902006-04-05 09:45:45 +0100388
Ralf Baechle61dcc6f2007-03-15 17:10:16 +0000389 return count;
Ralf Baechle26009902006-04-05 09:45:45 +0100390}
391
392
393static int file_open(struct inode *inode, struct file *filp)
394{
Ralf Baechle79e55bc2006-04-24 17:15:10 +0100395 int minor = iminor(inode);
Jonathan Corbet7558da92008-05-15 09:10:50 -0600396 int err;
Ralf Baechle26009902006-04-05 09:45:45 +0100397
Jonathan Corbet7558da92008-05-15 09:10:50 -0600398 lock_kernel();
399 err = rtlx_open(minor, (filp->f_flags & O_NONBLOCK) ? 0 : 1);
400 unlock_kernel();
401 return err;
Ralf Baechle26009902006-04-05 09:45:45 +0100402}
403
404static int file_release(struct inode *inode, struct file *filp)
405{
Ralf Baechle79e55bc2006-04-24 17:15:10 +0100406 int minor = iminor(inode);
Ralf Baechle26009902006-04-05 09:45:45 +0100407
408 return rtlx_release(minor);
409}
410
411static unsigned int file_poll(struct file *file, poll_table * wait)
412{
413 int minor;
414 unsigned int mask = 0;
415
Josef Sipek1b04fe92006-12-08 02:37:20 -0800416 minor = iminor(file->f_path.dentry->d_inode);
Ralf Baechle26009902006-04-05 09:45:45 +0100417
418 poll_wait(file, &channel_wqs[minor].rt_queue, wait);
419 poll_wait(file, &channel_wqs[minor].lx_queue, wait);
420
421 if (rtlx == NULL)
422 return 0;
423
424 /* data available to read? */
425 if (rtlx_read_poll(minor, 0))
426 mask |= POLLIN | POLLRDNORM;
427
428 /* space to write */
429 if (rtlx_write_poll(minor))
430 mask |= POLLOUT | POLLWRNORM;
431
432 return mask;
433}
434
435static ssize_t file_read(struct file *file, char __user * buffer, size_t count,
436 loff_t * ppos)
437{
Josef Sipek1b04fe92006-12-08 02:37:20 -0800438 int minor = iminor(file->f_path.dentry->d_inode);
Ralf Baechle26009902006-04-05 09:45:45 +0100439
440 /* data available? */
441 if (!rtlx_read_poll(minor, (file->f_flags & O_NONBLOCK) ? 0 : 1)) {
442 return 0; // -EAGAIN makes cat whinge
443 }
444
Ralf Baechle46230aa2007-03-16 12:16:27 +0000445 return rtlx_read(minor, buffer, count);
Ralf Baechle26009902006-04-05 09:45:45 +0100446}
447
448static ssize_t file_write(struct file *file, const char __user * buffer,
449 size_t count, loff_t * ppos)
450{
451 int minor;
452 struct rtlx_channel *rt;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000453
Josef Sipek1b04fe92006-12-08 02:37:20 -0800454 minor = iminor(file->f_path.dentry->d_inode);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000455 rt = &rtlx->channel[minor];
456
457 /* any space left... */
Ralf Baechle26009902006-04-05 09:45:45 +0100458 if (!rtlx_write_poll(minor)) {
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000459 int ret = 0;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000460
461 if (file->f_flags & O_NONBLOCK)
Ralf Baechleafc48412005-10-31 00:30:39 +0000462 return -EAGAIN;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000463
Ralf Baechle67e2ccc2007-02-22 14:19:48 +0000464 __wait_event_interruptible(channel_wqs[minor].rt_queue,
465 rtlx_write_poll(minor),
466 ret);
467 if (ret)
468 return ret;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000469 }
470
Ralf Baechle46230aa2007-03-16 12:16:27 +0000471 return rtlx_write(minor, buffer, count);
Ralf Baechlee01402b2005-07-14 15:57:16 +0000472}
473
Arjan van de Ven5dfe4c92007-02-12 00:55:31 -0800474static const struct file_operations rtlx_fops = {
Ralf Baechle26009902006-04-05 09:45:45 +0100475 .owner = THIS_MODULE,
476 .open = file_open,
477 .release = file_release,
478 .write = file_write,
479 .read = file_read,
480 .poll = file_poll
Ralf Baechlee01402b2005-07-14 15:57:16 +0000481};
482
Ralf Baechle26009902006-04-05 09:45:45 +0100483static struct irqaction rtlx_irq = {
484 .handler = rtlx_interrupt,
Thomas Gleixnerf40298f2006-07-01 19:29:20 -0700485 .flags = IRQF_DISABLED,
Ralf Baechle26009902006-04-05 09:45:45 +0100486 .name = "RTLX",
487};
488
Atsushi Nemoto97dcb822007-01-08 02:14:29 +0900489static int rtlx_irq_num = MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ;
Ralf Baechle26009902006-04-05 09:45:45 +0100490
Ralf Baechleafc48412005-10-31 00:30:39 +0000491static char register_chrdev_failed[] __initdata =
492 KERN_ERR "rtlx_module_init: unable to register device\n";
493
Ralf Baechle9d5a3f52007-07-28 00:51:45 +0100494static int __init rtlx_module_init(void)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000495{
Ralf Baechlebb3d7c72007-02-07 15:36:56 +0000496 struct device *dev;
497 int i, err;
Ralf Baechle26009902006-04-05 09:45:45 +0100498
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100499 if (!cpu_has_mipsmt) {
500 printk("VPE loader: not a MIPS MT capable processor\n");
501 return -ENODEV;
502 }
503
504 if (tclimit == 0) {
505 printk(KERN_WARNING "No TCs reserved for AP/SP, not "
506 "initializing RTLX.\nPass maxtcs=<n> argument as kernel "
507 "argument\n");
508
509 return -ENODEV;
510 }
511
Ralf Baechleafc48412005-10-31 00:30:39 +0000512 major = register_chrdev(0, module_name, &rtlx_fops);
513 if (major < 0) {
514 printk(register_chrdev_failed);
515 return major;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000516 }
517
Ralf Baechle26009902006-04-05 09:45:45 +0100518 /* initialise the wait queues */
519 for (i = 0; i < RTLX_CHANNELS; i++) {
520 init_waitqueue_head(&channel_wqs[i].rt_queue);
521 init_waitqueue_head(&channel_wqs[i].lx_queue);
Ralf Baechlec4c40182007-02-23 13:40:45 +0000522 atomic_set(&channel_wqs[i].in_open, 0);
Ralf Baechlebc4809e2007-03-15 17:13:47 +0000523 mutex_init(&channel_wqs[i].mutex);
Ralf Baechlebb3d7c72007-02-07 15:36:56 +0000524
Greg Kroah-Hartmana9b12612008-07-21 20:03:34 -0700525 dev = device_create(mt_class, NULL, MKDEV(major, i), NULL,
526 "%s%d", module_name, i);
Ralf Baechlebb3d7c72007-02-07 15:36:56 +0000527 if (IS_ERR(dev)) {
528 err = PTR_ERR(dev);
529 goto out_chrdev;
530 }
Ralf Baechle26009902006-04-05 09:45:45 +0100531 }
532
533 /* set up notifiers */
534 notify.start = starting;
535 notify.stop = stopping;
Ralf Baechle07cc0c92007-07-27 19:31:10 +0100536 vpe_notify(tclimit, &notify);
Ralf Baechle26009902006-04-05 09:45:45 +0100537
538 if (cpu_has_vint)
539 set_vi_handler(MIPS_CPU_RTLX_IRQ, rtlx_dispatch);
Kevin D. Kissell1928cc82008-04-16 15:32:22 +0200540 else {
541 pr_err("APRP RTLX init on non-vectored-interrupt processor\n");
542 err = -ENODEV;
543 goto out_chrdev;
544 }
Ralf Baechle26009902006-04-05 09:45:45 +0100545
546 rtlx_irq.dev_id = rtlx;
547 setup_irq(rtlx_irq_num, &rtlx_irq);
548
Ralf Baechleafc48412005-10-31 00:30:39 +0000549 return 0;
Ralf Baechlebb3d7c72007-02-07 15:36:56 +0000550
551out_chrdev:
552 for (i = 0; i < RTLX_CHANNELS; i++)
553 device_destroy(mt_class, MKDEV(major, i));
554
555 return err;
Ralf Baechlee01402b2005-07-14 15:57:16 +0000556}
557
Ralf Baechleafc48412005-10-31 00:30:39 +0000558static void __exit rtlx_module_exit(void)
Ralf Baechlee01402b2005-07-14 15:57:16 +0000559{
Ralf Baechlebb3d7c72007-02-07 15:36:56 +0000560 int i;
561
562 for (i = 0; i < RTLX_CHANNELS; i++)
563 device_destroy(mt_class, MKDEV(major, i));
564
Ralf Baechlee01402b2005-07-14 15:57:16 +0000565 unregister_chrdev(major, module_name);
566}
567
568module_init(rtlx_module_init);
569module_exit(rtlx_module_exit);
Ralf Baechleafc48412005-10-31 00:30:39 +0000570
Ralf Baechlee01402b2005-07-14 15:57:16 +0000571MODULE_DESCRIPTION("MIPS RTLX");
Ralf Baechle26009902006-04-05 09:45:45 +0100572MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
Ralf Baechlee01402b2005-07-14 15:57:16 +0000573MODULE_LICENSE("GPL");