Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved. |
Ralf Baechle | a84c96e | 2006-01-15 18:11:28 +0000 | [diff] [blame] | 3 | * Copyright (C) 2005, 06 Ralf Baechle (ralf@linux-mips.org) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 4 | * |
| 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 Baechle | bb3d7c7 | 2007-02-07 15:36:56 +0000 | [diff] [blame^] | 20 | #include <linux/device.h> |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 21 | #include <linux/kernel.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/fs.h> |
| 24 | #include <linux/init.h> |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 25 | #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> |
| 31 | #include <linux/syscalls.h> |
| 32 | #include <linux/moduleloader.h> |
Ralf Baechle | a84c96e | 2006-01-15 18:11:28 +0000 | [diff] [blame] | 33 | #include <linux/interrupt.h> |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 34 | #include <linux/poll.h> |
| 35 | #include <linux/sched.h> |
| 36 | #include <linux/wait.h> |
| 37 | #include <asm/mipsmtregs.h> |
Ralf Baechle | bb3d7c7 | 2007-02-07 15:36:56 +0000 | [diff] [blame^] | 38 | #include <asm/mips_mt.h> |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 39 | #include <asm/cacheflush.h> |
| 40 | #include <asm/atomic.h> |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 41 | #include <asm/cpu.h> |
| 42 | #include <asm/processor.h> |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 43 | #include <asm/system.h> |
| 44 | #include <asm/vpe.h> |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 45 | #include <asm/rtlx.h> |
| 46 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 47 | #define RTLX_TARG_VPE 1 |
| 48 | |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 49 | static struct rtlx_info *rtlx; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 50 | static int major; |
| 51 | static char module_name[] = "rtlx"; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 52 | |
| 53 | static struct chan_waitqueues { |
| 54 | wait_queue_head_t rt_queue; |
| 55 | wait_queue_head_t lx_queue; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 56 | int in_open; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 57 | } channel_wqs[RTLX_CHANNELS]; |
| 58 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 59 | static struct irqaction irq; |
| 60 | static int irq_num; |
| 61 | static struct vpe_notifications notify; |
| 62 | static int sp_stopping = 0; |
| 63 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 64 | extern void *vpe_get_shared(int index); |
| 65 | |
Ralf Baechle | 937a801 | 2006-10-07 19:44:33 +0100 | [diff] [blame] | 66 | static void rtlx_dispatch(void) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 67 | { |
Atsushi Nemoto | 97dcb82 | 2007-01-08 02:14:29 +0900 | [diff] [blame] | 68 | do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 69 | } |
| 70 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 71 | |
| 72 | /* Interrupt handler may be called before rtlx_init has otherwise had |
| 73 | a chance to run. |
| 74 | */ |
Ralf Baechle | 937a801 | 2006-10-07 19:44:33 +0100 | [diff] [blame] | 75 | static irqreturn_t rtlx_interrupt(int irq, void *dev_id) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 76 | { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 77 | int i; |
| 78 | |
| 79 | for (i = 0; i < RTLX_CHANNELS; i++) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 80 | wake_up(&channel_wqs[i].lx_queue); |
| 81 | wake_up(&channel_wqs[i].rt_queue); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 82 | } |
| 83 | |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 84 | return IRQ_HANDLED; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 85 | } |
| 86 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 87 | static __attribute_used__ void dump_rtlx(void) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 88 | { |
| 89 | int i; |
| 90 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 91 | printk("id 0x%lx state %d\n", rtlx->id, rtlx->state); |
| 92 | |
| 93 | for (i = 0; i < RTLX_CHANNELS; i++) { |
| 94 | struct rtlx_channel *chan = &rtlx->channel[i]; |
| 95 | |
| 96 | printk(" rt_state %d lx_state %d buffer_size %d\n", |
| 97 | chan->rt_state, chan->lx_state, chan->buffer_size); |
| 98 | |
| 99 | printk(" rt_read %d rt_write %d\n", |
| 100 | chan->rt_read, chan->rt_write); |
| 101 | |
| 102 | printk(" lx_read %d lx_write %d\n", |
| 103 | chan->lx_read, chan->lx_write); |
| 104 | |
| 105 | printk(" rt_buffer <%s>\n", chan->rt_buffer); |
| 106 | printk(" lx_buffer <%s>\n", chan->lx_buffer); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | /* call when we have the address of the shared structure from the SP side. */ |
| 111 | static int rtlx_init(struct rtlx_info *rtlxi) |
| 112 | { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 113 | if (rtlxi->id != RTLX_ID) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 114 | printk(KERN_ERR "no valid RTLX id at 0x%p 0x%x\n", rtlxi, rtlxi->id); |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 115 | return -ENOEXEC; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 116 | } |
| 117 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 118 | rtlx = rtlxi; |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 119 | |
| 120 | return 0; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 121 | } |
| 122 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 123 | /* notifications */ |
| 124 | static void starting(int vpe) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 125 | { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 126 | int i; |
| 127 | sp_stopping = 0; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 128 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 129 | /* force a reload of rtlx */ |
| 130 | rtlx=NULL; |
| 131 | |
| 132 | /* wake up any sleeping rtlx_open's */ |
| 133 | for (i = 0; i < RTLX_CHANNELS; i++) |
| 134 | wake_up_interruptible(&channel_wqs[i].lx_queue); |
| 135 | } |
| 136 | |
| 137 | static void stopping(int vpe) |
| 138 | { |
| 139 | int i; |
| 140 | |
| 141 | sp_stopping = 1; |
| 142 | for (i = 0; i < RTLX_CHANNELS; i++) |
| 143 | wake_up_interruptible(&channel_wqs[i].lx_queue); |
| 144 | } |
| 145 | |
| 146 | |
| 147 | int rtlx_open(int index, int can_sleep) |
| 148 | { |
| 149 | int ret; |
| 150 | struct rtlx_channel *chan; |
| 151 | volatile struct rtlx_info **p; |
| 152 | |
| 153 | if (index >= RTLX_CHANNELS) { |
| 154 | printk(KERN_DEBUG "rtlx_open index out of range\n"); |
| 155 | return -ENOSYS; |
| 156 | } |
| 157 | |
| 158 | if (channel_wqs[index].in_open) { |
| 159 | printk(KERN_DEBUG "rtlx_open channel %d already opened\n", index); |
| 160 | return -EBUSY; |
| 161 | } |
| 162 | |
| 163 | channel_wqs[index].in_open++; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 164 | |
| 165 | if (rtlx == NULL) { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 166 | if( (p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 167 | if (can_sleep) { |
| 168 | DECLARE_WAITQUEUE(wait, current); |
| 169 | |
| 170 | /* go to sleep */ |
| 171 | add_wait_queue(&channel_wqs[index].lx_queue, &wait); |
| 172 | |
| 173 | set_current_state(TASK_INTERRUPTIBLE); |
| 174 | while ((p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) { |
| 175 | schedule(); |
| 176 | set_current_state(TASK_INTERRUPTIBLE); |
| 177 | } |
| 178 | |
| 179 | set_current_state(TASK_RUNNING); |
| 180 | remove_wait_queue(&channel_wqs[index].lx_queue, &wait); |
| 181 | |
| 182 | /* back running */ |
| 183 | } else { |
| 184 | printk( KERN_DEBUG "No SP program loaded, and device " |
| 185 | "opened with O_NONBLOCK\n"); |
| 186 | channel_wqs[index].in_open = 0; |
| 187 | return -ENOSYS; |
| 188 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | if (*p == NULL) { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 192 | if (can_sleep) { |
| 193 | DECLARE_WAITQUEUE(wait, current); |
| 194 | |
| 195 | /* go to sleep */ |
| 196 | add_wait_queue(&channel_wqs[index].lx_queue, &wait); |
| 197 | |
| 198 | set_current_state(TASK_INTERRUPTIBLE); |
| 199 | while (*p == NULL) { |
| 200 | schedule(); |
| 201 | |
| 202 | /* reset task state to interruptable otherwise |
| 203 | we'll whizz round here like a very fast loopy |
| 204 | thing. schedule() appears to return with state |
| 205 | set to TASK_RUNNING. |
| 206 | |
| 207 | If the loaded SP program, for whatever reason, |
| 208 | doesn't set up the shared structure *p will never |
| 209 | become true. So whoever connected to either /dev/rt? |
| 210 | or if it was kspd, will then take up rather a lot of |
| 211 | processor cycles. |
| 212 | */ |
| 213 | |
| 214 | set_current_state(TASK_INTERRUPTIBLE); |
| 215 | } |
| 216 | |
| 217 | set_current_state(TASK_RUNNING); |
| 218 | remove_wait_queue(&channel_wqs[index].lx_queue, &wait); |
| 219 | |
| 220 | /* back running */ |
| 221 | } |
| 222 | else { |
| 223 | printk(" *vpe_get_shared is NULL. " |
| 224 | "Has an SP program been loaded?\n"); |
| 225 | channel_wqs[index].in_open = 0; |
| 226 | return -ENOSYS; |
| 227 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 228 | } |
| 229 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 230 | if ((unsigned int)*p < KSEG0) { |
| 231 | printk(KERN_WARNING "vpe_get_shared returned an invalid pointer " |
| 232 | "maybe an error code %d\n", (int)*p); |
| 233 | channel_wqs[index].in_open = 0; |
| 234 | return -ENOSYS; |
| 235 | } |
| 236 | |
| 237 | if ((ret = rtlx_init(*p)) < 0) { |
| 238 | channel_wqs[index].in_open = 0; |
| 239 | return ret; |
| 240 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 241 | } |
| 242 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 243 | chan = &rtlx->channel[index]; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 244 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 245 | if (chan->lx_state == RTLX_STATE_OPENED) { |
| 246 | channel_wqs[index].in_open = 0; |
| 247 | return -EBUSY; |
| 248 | } |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 249 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 250 | chan->lx_state = RTLX_STATE_OPENED; |
| 251 | channel_wqs[index].in_open = 0; |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 252 | return 0; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 253 | } |
| 254 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 255 | int rtlx_release(int index) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 256 | { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 257 | rtlx->channel[index].lx_state = RTLX_STATE_UNUSED; |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 258 | return 0; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 259 | } |
| 260 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 261 | unsigned int rtlx_read_poll(int index, int can_sleep) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 262 | { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 263 | struct rtlx_channel *chan; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 264 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 265 | if (rtlx == NULL) |
| 266 | return 0; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 267 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 268 | chan = &rtlx->channel[index]; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 269 | |
| 270 | /* data available to read? */ |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 271 | if (chan->lx_read == chan->lx_write) { |
| 272 | if (can_sleep) { |
| 273 | DECLARE_WAITQUEUE(wait, current); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 274 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 275 | /* go to sleep */ |
| 276 | add_wait_queue(&channel_wqs[index].lx_queue, &wait); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 277 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 278 | set_current_state(TASK_INTERRUPTIBLE); |
| 279 | while (chan->lx_read == chan->lx_write) { |
| 280 | schedule(); |
| 281 | |
| 282 | set_current_state(TASK_INTERRUPTIBLE); |
| 283 | |
| 284 | if (sp_stopping) { |
| 285 | set_current_state(TASK_RUNNING); |
| 286 | remove_wait_queue(&channel_wqs[index].lx_queue, &wait); |
| 287 | return 0; |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | set_current_state(TASK_RUNNING); |
| 292 | remove_wait_queue(&channel_wqs[index].lx_queue, &wait); |
| 293 | |
| 294 | /* back running */ |
| 295 | } |
| 296 | else |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | return (chan->lx_write + chan->buffer_size - chan->lx_read) |
| 301 | % chan->buffer_size; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 302 | } |
| 303 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 304 | static inline int write_spacefree(int read, int write, int size) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 305 | { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 306 | if (read == write) { |
| 307 | /* |
| 308 | * Never fill the buffer completely, so indexes are always |
| 309 | * equal if empty and only empty, or !equal if data available |
| 310 | */ |
| 311 | return size - 1; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 312 | } |
| 313 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 314 | return ((read + size - write) % size) - 1; |
| 315 | } |
| 316 | |
| 317 | unsigned int rtlx_write_poll(int index) |
| 318 | { |
| 319 | struct rtlx_channel *chan = &rtlx->channel[index]; |
| 320 | return write_spacefree(chan->rt_read, chan->rt_write, chan->buffer_size); |
| 321 | } |
| 322 | |
| 323 | static inline void copy_to(void *dst, void *src, size_t count, int user) |
| 324 | { |
| 325 | if (user) |
| 326 | copy_to_user(dst, src, count); |
| 327 | else |
| 328 | memcpy(dst, src, count); |
| 329 | } |
| 330 | |
| 331 | static inline void copy_from(void *dst, void *src, size_t count, int user) |
| 332 | { |
| 333 | if (user) |
| 334 | copy_from_user(dst, src, count); |
| 335 | else |
| 336 | memcpy(dst, src, count); |
| 337 | } |
| 338 | |
| 339 | ssize_t rtlx_read(int index, void *buff, size_t count, int user) |
| 340 | { |
| 341 | size_t fl = 0L; |
| 342 | struct rtlx_channel *lx; |
| 343 | |
| 344 | if (rtlx == NULL) |
| 345 | return -ENOSYS; |
| 346 | |
| 347 | lx = &rtlx->channel[index]; |
| 348 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 349 | /* find out how much in total */ |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 350 | count = min(count, |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 351 | (size_t)(lx->lx_write + lx->buffer_size - lx->lx_read) |
| 352 | % lx->buffer_size); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 353 | |
| 354 | /* then how much from the read pointer onwards */ |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 355 | fl = min( count, (size_t)lx->buffer_size - lx->lx_read); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 356 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 357 | copy_to(buff, &lx->lx_buffer[lx->lx_read], fl, user); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 358 | |
| 359 | /* and if there is anything left at the beginning of the buffer */ |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 360 | if ( count - fl ) |
| 361 | copy_to (buff + fl, lx->lx_buffer, count - fl, user); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 362 | |
| 363 | /* update the index */ |
| 364 | lx->lx_read += count; |
| 365 | lx->lx_read %= lx->buffer_size; |
| 366 | |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 367 | return count; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 368 | } |
| 369 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 370 | ssize_t rtlx_write(int index, void *buffer, size_t count, int user) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 371 | { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 372 | struct rtlx_channel *rt; |
| 373 | size_t fl; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 374 | |
| 375 | if (rtlx == NULL) |
| 376 | return(-ENOSYS); |
| 377 | |
| 378 | rt = &rtlx->channel[index]; |
| 379 | |
| 380 | /* total number of bytes to copy */ |
| 381 | count = min(count, |
| 382 | (size_t)write_spacefree(rt->rt_read, rt->rt_write, |
| 383 | rt->buffer_size)); |
| 384 | |
| 385 | /* first bit from write pointer to the end of the buffer, or count */ |
| 386 | fl = min(count, (size_t) rt->buffer_size - rt->rt_write); |
| 387 | |
| 388 | copy_from (&rt->rt_buffer[rt->rt_write], buffer, fl, user); |
| 389 | |
| 390 | /* if there's any left copy to the beginning of the buffer */ |
| 391 | if( count - fl ) |
| 392 | copy_from (rt->rt_buffer, buffer + fl, count - fl, user); |
| 393 | |
| 394 | rt->rt_write += count; |
| 395 | rt->rt_write %= rt->buffer_size; |
| 396 | |
| 397 | return(count); |
| 398 | } |
| 399 | |
| 400 | |
| 401 | static int file_open(struct inode *inode, struct file *filp) |
| 402 | { |
Ralf Baechle | 79e55bc | 2006-04-24 17:15:10 +0100 | [diff] [blame] | 403 | int minor = iminor(inode); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 404 | |
| 405 | return rtlx_open(minor, (filp->f_flags & O_NONBLOCK) ? 0 : 1); |
| 406 | } |
| 407 | |
| 408 | static int file_release(struct inode *inode, struct file *filp) |
| 409 | { |
Ralf Baechle | 79e55bc | 2006-04-24 17:15:10 +0100 | [diff] [blame] | 410 | int minor = iminor(inode); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 411 | |
| 412 | return rtlx_release(minor); |
| 413 | } |
| 414 | |
| 415 | static unsigned int file_poll(struct file *file, poll_table * wait) |
| 416 | { |
| 417 | int minor; |
| 418 | unsigned int mask = 0; |
| 419 | |
Josef Sipek | 1b04fe9 | 2006-12-08 02:37:20 -0800 | [diff] [blame] | 420 | minor = iminor(file->f_path.dentry->d_inode); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 421 | |
| 422 | poll_wait(file, &channel_wqs[minor].rt_queue, wait); |
| 423 | poll_wait(file, &channel_wqs[minor].lx_queue, wait); |
| 424 | |
| 425 | if (rtlx == NULL) |
| 426 | return 0; |
| 427 | |
| 428 | /* data available to read? */ |
| 429 | if (rtlx_read_poll(minor, 0)) |
| 430 | mask |= POLLIN | POLLRDNORM; |
| 431 | |
| 432 | /* space to write */ |
| 433 | if (rtlx_write_poll(minor)) |
| 434 | mask |= POLLOUT | POLLWRNORM; |
| 435 | |
| 436 | return mask; |
| 437 | } |
| 438 | |
| 439 | static ssize_t file_read(struct file *file, char __user * buffer, size_t count, |
| 440 | loff_t * ppos) |
| 441 | { |
Josef Sipek | 1b04fe9 | 2006-12-08 02:37:20 -0800 | [diff] [blame] | 442 | int minor = iminor(file->f_path.dentry->d_inode); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 443 | |
| 444 | /* data available? */ |
| 445 | if (!rtlx_read_poll(minor, (file->f_flags & O_NONBLOCK) ? 0 : 1)) { |
| 446 | return 0; // -EAGAIN makes cat whinge |
| 447 | } |
| 448 | |
| 449 | return rtlx_read(minor, buffer, count, 1); |
| 450 | } |
| 451 | |
| 452 | static ssize_t file_write(struct file *file, const char __user * buffer, |
| 453 | size_t count, loff_t * ppos) |
| 454 | { |
| 455 | int minor; |
| 456 | struct rtlx_channel *rt; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 457 | DECLARE_WAITQUEUE(wait, current); |
| 458 | |
Josef Sipek | 1b04fe9 | 2006-12-08 02:37:20 -0800 | [diff] [blame] | 459 | minor = iminor(file->f_path.dentry->d_inode); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 460 | rt = &rtlx->channel[minor]; |
| 461 | |
| 462 | /* any space left... */ |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 463 | if (!rtlx_write_poll(minor)) { |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 464 | |
| 465 | if (file->f_flags & O_NONBLOCK) |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 466 | return -EAGAIN; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 467 | |
| 468 | add_wait_queue(&channel_wqs[minor].rt_queue, &wait); |
| 469 | set_current_state(TASK_INTERRUPTIBLE); |
| 470 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 471 | while (!rtlx_write_poll(minor)) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 472 | schedule(); |
| 473 | |
| 474 | set_current_state(TASK_RUNNING); |
| 475 | remove_wait_queue(&channel_wqs[minor].rt_queue, &wait); |
| 476 | } |
| 477 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 478 | return rtlx_write(minor, (void *)buffer, count, 1); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 479 | } |
| 480 | |
| 481 | static struct file_operations rtlx_fops = { |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 482 | .owner = THIS_MODULE, |
| 483 | .open = file_open, |
| 484 | .release = file_release, |
| 485 | .write = file_write, |
| 486 | .read = file_read, |
| 487 | .poll = file_poll |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 488 | }; |
| 489 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 490 | static struct irqaction rtlx_irq = { |
| 491 | .handler = rtlx_interrupt, |
Thomas Gleixner | f40298f | 2006-07-01 19:29:20 -0700 | [diff] [blame] | 492 | .flags = IRQF_DISABLED, |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 493 | .name = "RTLX", |
| 494 | }; |
| 495 | |
Atsushi Nemoto | 97dcb82 | 2007-01-08 02:14:29 +0900 | [diff] [blame] | 496 | static int rtlx_irq_num = MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 497 | |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 498 | static char register_chrdev_failed[] __initdata = |
| 499 | KERN_ERR "rtlx_module_init: unable to register device\n"; |
| 500 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 501 | static int rtlx_module_init(void) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 502 | { |
Ralf Baechle | bb3d7c7 | 2007-02-07 15:36:56 +0000 | [diff] [blame^] | 503 | struct device *dev; |
| 504 | int i, err; |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 505 | |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 506 | major = register_chrdev(0, module_name, &rtlx_fops); |
| 507 | if (major < 0) { |
| 508 | printk(register_chrdev_failed); |
| 509 | return major; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 510 | } |
| 511 | |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 512 | /* initialise the wait queues */ |
| 513 | for (i = 0; i < RTLX_CHANNELS; i++) { |
| 514 | init_waitqueue_head(&channel_wqs[i].rt_queue); |
| 515 | init_waitqueue_head(&channel_wqs[i].lx_queue); |
| 516 | channel_wqs[i].in_open = 0; |
Ralf Baechle | bb3d7c7 | 2007-02-07 15:36:56 +0000 | [diff] [blame^] | 517 | |
| 518 | dev = device_create(mt_class, NULL, MKDEV(major, i), |
| 519 | "%s%d", module_name, i); |
| 520 | if (IS_ERR(dev)) { |
| 521 | err = PTR_ERR(dev); |
| 522 | goto out_chrdev; |
| 523 | } |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 524 | } |
| 525 | |
| 526 | /* set up notifiers */ |
| 527 | notify.start = starting; |
| 528 | notify.stop = stopping; |
| 529 | vpe_notify(RTLX_TARG_VPE, ¬ify); |
| 530 | |
| 531 | if (cpu_has_vint) |
| 532 | set_vi_handler(MIPS_CPU_RTLX_IRQ, rtlx_dispatch); |
| 533 | |
| 534 | rtlx_irq.dev_id = rtlx; |
| 535 | setup_irq(rtlx_irq_num, &rtlx_irq); |
| 536 | |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 537 | return 0; |
Ralf Baechle | bb3d7c7 | 2007-02-07 15:36:56 +0000 | [diff] [blame^] | 538 | |
| 539 | out_chrdev: |
| 540 | for (i = 0; i < RTLX_CHANNELS; i++) |
| 541 | device_destroy(mt_class, MKDEV(major, i)); |
| 542 | |
| 543 | return err; |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 544 | } |
| 545 | |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 546 | static void __exit rtlx_module_exit(void) |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 547 | { |
Ralf Baechle | bb3d7c7 | 2007-02-07 15:36:56 +0000 | [diff] [blame^] | 548 | int i; |
| 549 | |
| 550 | for (i = 0; i < RTLX_CHANNELS; i++) |
| 551 | device_destroy(mt_class, MKDEV(major, i)); |
| 552 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 553 | unregister_chrdev(major, module_name); |
| 554 | } |
| 555 | |
| 556 | module_init(rtlx_module_init); |
| 557 | module_exit(rtlx_module_exit); |
Ralf Baechle | afc4841 | 2005-10-31 00:30:39 +0000 | [diff] [blame] | 558 | |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 559 | MODULE_DESCRIPTION("MIPS RTLX"); |
Ralf Baechle | 2600990 | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 560 | MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc."); |
Ralf Baechle | e01402b | 2005-07-14 15:57:16 +0000 | [diff] [blame] | 561 | MODULE_LICENSE("GPL"); |