Venkatesh Yadav Abbarapu | 574b401 | 2013-11-11 18:02:27 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved. |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/fs.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/miscdevice.h> |
| 18 | #include <linux/spinlock.h> |
| 19 | #include <linux/uaccess.h> |
| 20 | #include <linux/io.h> |
| 21 | #include <linux/irq.h> |
| 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/sched.h> |
| 24 | #include <linux/wait.h> |
| 25 | #include <linux/poll.h> |
| 26 | #include <mach/msm_iomap.h> |
| 27 | |
| 28 | #include <linux/fsm_dfe_hh.h> |
| 29 | |
| 30 | /* |
| 31 | * DFE of FSM9XXX |
| 32 | */ |
| 33 | |
| 34 | #define HH_ADDR_MASK 0x000ffffc |
| 35 | #define HH_OFFSET_VALID(offset) (((offset) & ~HH_ADDR_MASK) == 0) |
| 36 | #define HH_REG_IOADDR(offset) ((uint8_t *) MSM_HH_BASE + (offset)) |
| 37 | #define HH_MAKE_OFFSET(blk, adr) (((blk)&0x1F)<<15|((adr)&0x1FFF)<<2) |
| 38 | |
| 39 | #define HH_REG_SCPN_IREQ_MASK HH_REG_IOADDR(HH_MAKE_OFFSET(5, 0x12)) |
| 40 | #define HH_REG_SCPN_IREQ_FLAG HH_REG_IOADDR(HH_MAKE_OFFSET(5, 0x13)) |
| 41 | |
| 42 | /* |
| 43 | * Device private information per device node |
| 44 | */ |
| 45 | |
| 46 | #define HH_IRQ_FIFO_SIZE 64 |
| 47 | #define HH_IRQ_FIFO_EMPTY(pdev) ((pdev)->irq_fifo_head == \ |
| 48 | (pdev)->irq_fifo_tail) |
| 49 | #define HH_IRQ_FIFO_FULL(pdev) ((((pdev)->irq_fifo_tail + 1) % \ |
| 50 | HH_IRQ_FIFO_SIZE) == \ |
| 51 | (pdev)->irq_fifo_head) |
| 52 | |
Venkatesh Yadav Abbarapu | 574b401 | 2013-11-11 18:02:27 +0530 | [diff] [blame] | 53 | #define UINT32_MAX (0xFFFFFFFFU) |
| 54 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 55 | static struct hh_dev_node_info { |
| 56 | spinlock_t hh_lock; |
| 57 | char irq_fifo[HH_IRQ_FIFO_SIZE]; |
| 58 | unsigned int irq_fifo_head, irq_fifo_tail; |
| 59 | wait_queue_head_t wq; |
| 60 | } hh_dev_info; |
| 61 | |
| 62 | /* |
| 63 | * Device private information per file |
| 64 | */ |
| 65 | |
| 66 | struct hh_dev_file_info { |
| 67 | /* Buffer */ |
| 68 | unsigned int *parray; |
| 69 | unsigned int array_num; |
| 70 | |
| 71 | struct dfe_command_entry *pcmd; |
| 72 | unsigned int cmd_num; |
| 73 | }; |
| 74 | |
| 75 | /* |
| 76 | * File interface |
| 77 | */ |
| 78 | |
| 79 | static int hh_open(struct inode *inode, struct file *file) |
| 80 | { |
| 81 | struct hh_dev_file_info *pdfi; |
| 82 | |
| 83 | /* private data allocation */ |
| 84 | pdfi = kmalloc(sizeof(*pdfi), GFP_KERNEL); |
| 85 | if (pdfi == NULL) |
| 86 | return -ENOMEM; |
| 87 | file->private_data = pdfi; |
| 88 | |
| 89 | /* buffer initialization */ |
| 90 | pdfi->parray = NULL; |
| 91 | pdfi->array_num = 0; |
| 92 | pdfi->pcmd = NULL; |
| 93 | pdfi->cmd_num = 0; |
| 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static int hh_release(struct inode *inode, struct file *file) |
| 99 | { |
| 100 | struct hh_dev_file_info *pdfi; |
| 101 | |
| 102 | pdfi = (struct hh_dev_file_info *) file->private_data; |
| 103 | |
| 104 | kfree(pdfi->parray); |
| 105 | pdfi->parray = NULL; |
| 106 | pdfi->array_num = 0; |
| 107 | |
| 108 | kfree(pdfi->pcmd); |
| 109 | pdfi->pcmd = NULL; |
| 110 | pdfi->cmd_num = 0; |
| 111 | |
| 112 | kfree(file->private_data); |
| 113 | file->private_data = NULL; |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | static ssize_t hh_read(struct file *filp, char __user *buf, size_t count, |
| 119 | loff_t *f_pos) |
| 120 | { |
| 121 | signed char irq = -1; |
| 122 | unsigned long irq_flags; |
| 123 | |
| 124 | do { |
| 125 | spin_lock_irqsave(&hh_dev_info.hh_lock, irq_flags); |
| 126 | if (!HH_IRQ_FIFO_EMPTY(&hh_dev_info)) { |
| 127 | irq = hh_dev_info.irq_fifo[hh_dev_info.irq_fifo_head]; |
| 128 | if (++hh_dev_info.irq_fifo_head == HH_IRQ_FIFO_SIZE) |
| 129 | hh_dev_info.irq_fifo_head = 0; |
| 130 | } |
| 131 | spin_unlock_irqrestore(&hh_dev_info.hh_lock, irq_flags); |
| 132 | |
| 133 | if (irq < 0) |
| 134 | if (wait_event_interruptible(hh_dev_info.wq, |
| 135 | !HH_IRQ_FIFO_EMPTY(&hh_dev_info)) < 0) |
| 136 | break; |
| 137 | } while (irq < 0); |
| 138 | |
| 139 | if (irq < 0) { |
| 140 | /* No pending interrupt */ |
| 141 | return 0; |
| 142 | } else { |
| 143 | put_user(irq, buf); |
| 144 | return 1; |
| 145 | } |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | static ssize_t hh_write(struct file *file, const char __user *buffer, |
| 151 | size_t count, loff_t *ppos) |
| 152 | { |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | static long hh_ioctl(struct file *file, |
| 157 | unsigned int cmd, unsigned long arg) |
| 158 | { |
| 159 | unsigned int __user *argp = (unsigned int __user *) arg; |
| 160 | struct hh_dev_file_info *pdfi = |
| 161 | (struct hh_dev_file_info *) file->private_data; |
| 162 | |
| 163 | switch (cmd) { |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 164 | case DFE_IOCTL_READ_REGISTER: |
| 165 | { |
| 166 | unsigned int offset, value; |
| 167 | |
| 168 | if (get_user(offset, argp)) |
| 169 | return -EFAULT; |
| 170 | if (!HH_OFFSET_VALID(offset)) |
| 171 | return -EINVAL; |
| 172 | value = __raw_readl(HH_REG_IOADDR(offset)); |
| 173 | if (put_user(value, argp)) |
| 174 | return -EFAULT; |
| 175 | } |
| 176 | break; |
| 177 | |
| 178 | case DFE_IOCTL_WRITE_REGISTER: |
| 179 | { |
| 180 | struct dfe_write_register_param param; |
| 181 | |
| 182 | if (copy_from_user(¶m, argp, sizeof param)) |
| 183 | return -EFAULT; |
| 184 | if (!HH_OFFSET_VALID(param.offset)) |
| 185 | return -EINVAL; |
| 186 | __raw_writel(param.value, |
| 187 | HH_REG_IOADDR(param.offset)); |
| 188 | } |
| 189 | break; |
| 190 | |
| 191 | case DFE_IOCTL_WRITE_REGISTER_WITH_MASK: |
| 192 | { |
| 193 | struct dfe_write_register_mask_param param; |
| 194 | unsigned int value; |
| 195 | unsigned long irq_flags; |
| 196 | |
| 197 | if (copy_from_user(¶m, argp, sizeof param)) |
| 198 | return -EFAULT; |
| 199 | if (!HH_OFFSET_VALID(param.offset)) |
| 200 | return -EINVAL; |
| 201 | spin_lock_irqsave(&hh_dev_info.hh_lock, |
| 202 | irq_flags); |
| 203 | value = __raw_readl(HH_REG_IOADDR(param.offset)); |
| 204 | value &= ~param.mask; |
| 205 | value |= param.value & param.mask; |
| 206 | __raw_writel(value, HH_REG_IOADDR(param.offset)); |
| 207 | spin_unlock_irqrestore(&hh_dev_info.hh_lock, |
| 208 | irq_flags); |
| 209 | } |
| 210 | break; |
| 211 | |
| 212 | case DFE_IOCTL_READ_REGISTER_ARRAY: |
| 213 | case DFE_IOCTL_WRITE_REGISTER_ARRAY: |
| 214 | { |
| 215 | struct dfe_read_write_array_param param; |
| 216 | unsigned int req_sz; |
| 217 | unsigned long irq_flags; |
| 218 | unsigned int i; |
| 219 | void *addr; |
| 220 | |
| 221 | if (copy_from_user(¶m, argp, sizeof param)) |
| 222 | return -EFAULT; |
| 223 | if (!HH_OFFSET_VALID(param.offset)) |
| 224 | return -EINVAL; |
Venkatesh Yadav Abbarapu | a3c7f0a | 2013-11-28 13:06:18 +0530 | [diff] [blame^] | 225 | if ((param.num == 0) || |
| 226 | (param.num >= (UINT32_MAX / sizeof(unsigned int)))) |
| 227 | return -EINVAL; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 228 | req_sz = sizeof(unsigned int) * param.num; |
| 229 | |
| 230 | if (pdfi->array_num < param.num) { |
| 231 | void *pmem; |
| 232 | |
| 233 | pmem = kmalloc(req_sz, GFP_KERNEL); |
| 234 | if (pmem == NULL) |
| 235 | return -ENOMEM; |
| 236 | pdfi->parray = (unsigned int *) pmem; |
| 237 | pdfi->array_num = param.num; |
| 238 | } |
| 239 | |
| 240 | if (cmd == DFE_IOCTL_WRITE_REGISTER_ARRAY) |
| 241 | if (copy_from_user(pdfi->parray, |
| 242 | param.pArray, req_sz)) |
| 243 | return -EFAULT; |
| 244 | |
| 245 | addr = HH_REG_IOADDR(param.offset); |
| 246 | |
| 247 | spin_lock_irqsave(&hh_dev_info.hh_lock, |
| 248 | irq_flags); |
| 249 | for (i = 0; i < param.num; ++i, addr += 4) { |
| 250 | if (cmd == DFE_IOCTL_READ_REGISTER_ARRAY) |
| 251 | pdfi->parray[i] = __raw_readl(addr); |
| 252 | else |
| 253 | __raw_writel(pdfi->parray[i], addr); |
| 254 | } |
| 255 | spin_unlock_irqrestore(&hh_dev_info.hh_lock, |
| 256 | irq_flags); |
| 257 | |
| 258 | if (cmd == DFE_IOCTL_READ_REGISTER_ARRAY) |
| 259 | if (copy_to_user(pdfi->parray, |
| 260 | param.pArray, req_sz)) |
| 261 | return -EFAULT; |
| 262 | } |
| 263 | break; |
| 264 | |
| 265 | case DFE_IOCTL_COMMAND: |
| 266 | { |
| 267 | struct dfe_command_param param; |
| 268 | unsigned int req_sz; |
| 269 | unsigned long irq_flags; |
| 270 | unsigned int i, value; |
| 271 | struct dfe_command_entry *pcmd; |
| 272 | void *addr; |
| 273 | |
| 274 | if (copy_from_user(¶m, argp, sizeof param)) |
| 275 | return -EFAULT; |
Venkatesh Yadav Abbarapu | 574b401 | 2013-11-11 18:02:27 +0530 | [diff] [blame] | 276 | if ((param.num == 0) || |
| 277 | (param.num >= (UINT32_MAX / |
| 278 | sizeof(struct dfe_command_entry)))) |
| 279 | return -EINVAL; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 280 | req_sz = sizeof(struct dfe_command_entry) * param.num; |
| 281 | |
| 282 | if (pdfi->cmd_num < param.num) { |
| 283 | void *pmem; |
| 284 | |
| 285 | pmem = kmalloc(req_sz, GFP_KERNEL); |
| 286 | if (pmem == NULL) |
| 287 | return -ENOMEM; |
| 288 | pdfi->pcmd = (struct dfe_command_entry *) pmem; |
| 289 | pdfi->cmd_num = param.num; |
| 290 | } |
| 291 | |
| 292 | if (copy_from_user(pdfi->pcmd, param.pEntry, req_sz)) |
| 293 | return -EFAULT; |
| 294 | |
| 295 | pcmd = pdfi->pcmd; |
| 296 | |
| 297 | spin_lock_irqsave(&hh_dev_info.hh_lock, |
| 298 | irq_flags); |
| 299 | for (i = 0; i < param.num; ++i, ++pcmd) { |
| 300 | if (!HH_OFFSET_VALID(pcmd->offset)) |
| 301 | return -EINVAL; |
| 302 | addr = HH_REG_IOADDR(pcmd->offset); |
| 303 | |
| 304 | switch (pcmd->code) { |
| 305 | case DFE_IOCTL_COMMAND_CODE_WRITE: |
| 306 | __raw_writel(pcmd->value, addr); |
| 307 | break; |
| 308 | case DFE_IOCTL_COMMAND_CODE_WRITE_WITH_MASK: |
| 309 | value = __raw_readl(addr); |
| 310 | value &= ~pcmd->mask; |
| 311 | value |= pcmd->value & pcmd->mask; |
| 312 | __raw_writel(value, addr); |
| 313 | break; |
| 314 | } |
| 315 | } |
| 316 | spin_unlock_irqrestore(&hh_dev_info.hh_lock, |
| 317 | irq_flags); |
| 318 | } |
| 319 | break; |
| 320 | |
| 321 | default: |
| 322 | return -EINVAL; |
| 323 | } |
| 324 | |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | static unsigned int hh_poll(struct file *filp, |
| 329 | struct poll_table_struct *wait) |
| 330 | { |
| 331 | unsigned mask = 0; |
| 332 | |
| 333 | if (!HH_IRQ_FIFO_EMPTY(&hh_dev_info)) |
| 334 | mask |= POLLIN; |
| 335 | |
| 336 | if (mask == 0) { |
| 337 | poll_wait(filp, &hh_dev_info.wq, wait); |
| 338 | if (!HH_IRQ_FIFO_EMPTY(&hh_dev_info)) |
| 339 | mask |= POLLIN; |
| 340 | } |
| 341 | |
| 342 | return mask; |
| 343 | } |
| 344 | |
| 345 | static const struct file_operations hh_fops = { |
| 346 | .owner = THIS_MODULE, |
| 347 | .open = hh_open, |
| 348 | .release = hh_release, |
| 349 | .read = hh_read, |
| 350 | .write = hh_write, |
| 351 | .unlocked_ioctl = hh_ioctl, |
| 352 | .poll = hh_poll, |
| 353 | }; |
| 354 | |
| 355 | /* |
| 356 | * Interrupt handling |
| 357 | */ |
| 358 | |
| 359 | static irqreturn_t hh_irq_handler(int irq, void *data) |
| 360 | { |
| 361 | unsigned int irq_enable, irq_flag, irq_mask; |
| 362 | int i; |
| 363 | |
| 364 | irq_enable = __raw_readl(HH_REG_SCPN_IREQ_MASK); |
| 365 | irq_flag = __raw_readl(HH_REG_SCPN_IREQ_FLAG); |
| 366 | irq_flag &= irq_enable; |
| 367 | |
| 368 | /* Disables interrupts */ |
| 369 | irq_enable &= ~irq_flag; |
| 370 | __raw_writel(irq_enable, HH_REG_SCPN_IREQ_MASK); |
| 371 | |
| 372 | /* Adds the pending interrupts to irq_fifo */ |
| 373 | spin_lock(&hh_dev_info.hh_lock); |
| 374 | for (i = 0, irq_mask = 1; i < 32; ++i, irq_mask <<= 1) { |
| 375 | if (HH_IRQ_FIFO_FULL(&hh_dev_info)) |
| 376 | break; |
| 377 | if (irq_flag & irq_mask) { |
| 378 | hh_dev_info.irq_fifo[hh_dev_info.irq_fifo_tail] = \ |
| 379 | (char) i; |
| 380 | if (++hh_dev_info.irq_fifo_tail == HH_IRQ_FIFO_SIZE) |
| 381 | hh_dev_info.irq_fifo_tail = 0; |
| 382 | } |
| 383 | } |
| 384 | spin_unlock(&hh_dev_info.hh_lock); |
| 385 | |
| 386 | /* Wakes up pending processes */ |
| 387 | wake_up_interruptible(&hh_dev_info.wq); |
| 388 | |
| 389 | return IRQ_HANDLED; |
| 390 | } |
| 391 | |
| 392 | /* |
| 393 | * Driver initialization & cleanup |
| 394 | */ |
| 395 | |
| 396 | static struct miscdevice hh_misc_dev = { |
| 397 | .minor = MISC_DYNAMIC_MINOR, |
| 398 | .name = DFE_HH_DEVICE_NAME, |
| 399 | .fops = &hh_fops, |
| 400 | }; |
| 401 | |
| 402 | static int __init hh_init(void) |
| 403 | { |
| 404 | int ret; |
| 405 | |
| 406 | /* lock initialization */ |
| 407 | spin_lock_init(&hh_dev_info.hh_lock); |
| 408 | |
| 409 | /* interrupt handler */ |
| 410 | hh_dev_info.irq_fifo_head = 0; |
| 411 | hh_dev_info.irq_fifo_tail = 0; |
| 412 | ret = request_irq(INT_HH_SUPSS_IRQ, hh_irq_handler, |
| 413 | IRQF_TRIGGER_RISING, "hh_dev", 0); |
| 414 | if (ret < 0) { |
| 415 | pr_err("Cannot register HH interrupt handler.\n"); |
| 416 | return ret; |
| 417 | } |
| 418 | |
| 419 | /* wait queue */ |
| 420 | init_waitqueue_head(&hh_dev_info.wq); |
| 421 | |
| 422 | return misc_register(&hh_misc_dev); |
| 423 | } |
| 424 | |
| 425 | static void __exit hh_exit(void) |
| 426 | { |
| 427 | misc_deregister(&hh_misc_dev); |
| 428 | free_irq(INT_HH_SUPSS_IRQ, 0); |
| 429 | } |
| 430 | |
| 431 | MODULE_LICENSE("GPL v2"); |
| 432 | MODULE_AUTHOR("Rohit Vaswani <rvaswani@codeaurora.org>"); |
| 433 | MODULE_DESCRIPTION("Qualcomm Hammerhead Digital Front End driver"); |
| 434 | MODULE_VERSION("1.0"); |
| 435 | |
| 436 | module_init(hh_init); |
| 437 | module_exit(hh_exit); |
| 438 | |