2 * Driver for the Conexant CX25821 PCIe bridge
4 * Copyright (C) 2009 Conexant Systems Inc.
5 * Authors <hiep.huynh@conexant.com>, <shu.lin@conexant.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25 #include "cx25821-video.h"
26 #include "cx25821-audio-upstream.h"
29 #include <linux/errno.h>
30 #include <linux/kernel.h>
31 #include <linux/init.h>
32 #include <linux/module.h>
33 #include <linux/syscalls.h>
34 #include <linux/file.h>
35 #include <linux/fcntl.h>
36 #include <linux/delay.h>
37 #include <linux/slab.h>
38 #include <linux/uaccess.h>
40 MODULE_DESCRIPTION("v4l2 driver module for cx25821 based TV cards");
41 MODULE_AUTHOR("Hiep Huynh <hiep.huynh@conexant.com>");
42 MODULE_LICENSE("GPL");
44 static int _intr_msk = FLD_AUD_SRC_RISCI1 | FLD_AUD_SRC_OF |
45 FLD_AUD_SRC_SYNC | FLD_AUD_SRC_OPC_ERR;
47 static int cx25821_sram_channel_setup_upstream_audio(struct cx25821_dev *dev,
48 struct sram_channel *ch,
49 unsigned int bpl, u32 risc)
51 unsigned int i, lines;
54 if (ch->cmds_start == 0) {
55 cx_write(ch->ptr1_reg, 0);
56 cx_write(ch->ptr2_reg, 0);
57 cx_write(ch->cnt2_reg, 0);
58 cx_write(ch->cnt1_reg, 0);
62 bpl = (bpl + 7) & ~7; /* alignment */
64 lines = ch->fifo_size / bpl;
72 for (i = 0; i < lines; i++) {
73 cx_write(cdt + 16 * i, ch->fifo_start + bpl * i);
74 cx_write(cdt + 16 * i + 4, 0);
75 cx_write(cdt + 16 * i + 8, 0);
76 cx_write(cdt + 16 * i + 12, 0);
80 cx_write(ch->cmds_start + 0, risc);
82 cx_write(ch->cmds_start + 4, 0);
83 cx_write(ch->cmds_start + 8, cdt);
84 cx_write(ch->cmds_start + 12, AUDIO_CDT_SIZE_QW);
85 cx_write(ch->cmds_start + 16, ch->ctrl_start);
88 cx_write(ch->cmds_start + 20, AUDIO_IQ_SIZE_DW);
90 for (i = 24; i < 80; i += 4)
91 cx_write(ch->cmds_start + i, 0);
94 cx_write(ch->ptr1_reg, ch->fifo_start);
95 cx_write(ch->ptr2_reg, cdt);
96 cx_write(ch->cnt2_reg, AUDIO_CDT_SIZE_QW);
97 cx_write(ch->cnt1_reg, AUDIO_CLUSTER_SIZE_QW - 1);
102 static __le32 *cx25821_risc_field_upstream_audio(struct cx25821_dev *dev,
104 dma_addr_t databuf_phys_addr,
109 struct sram_channel *sram_ch =
110 dev->channels[dev->_audio_upstream_channel].sram_channels;
114 for (line = 0; line < LINES_PER_AUDIO_BUFFER; line++) {
115 *(rp++) = cpu_to_le32(RISC_READ | RISC_SOL | RISC_EOL | bpl);
116 *(rp++) = cpu_to_le32(databuf_phys_addr + offset);
117 *(rp++) = cpu_to_le32(0); /* bits 63-32 */
119 /* Check if we need to enable the FIFO
120 * after the first 3 lines.
121 * For the upstream audio channel,
122 * the risc engine will enable the FIFO */
123 if (fifo_enable && line == 2) {
124 *(rp++) = RISC_WRITECR;
125 *(rp++) = sram_ch->dma_ctl;
126 *(rp++) = sram_ch->fld_aud_fifo_en;
127 *(rp++) = 0x00000020;
130 offset += AUDIO_LINE_SIZE;
136 static int cx25821_risc_buffer_upstream_audio(struct cx25821_dev *dev,
138 unsigned int bpl, unsigned int lines)
142 int frame = 0, i = 0;
143 int frame_size = AUDIO_DATA_BUF_SZ;
144 int databuf_offset = 0;
145 int risc_flag = RISC_CNT_INC;
146 dma_addr_t risc_phys_jump_addr;
148 /* Virtual address of Risc buffer program */
149 rp = dev->_risc_virt_addr;
151 /* sync instruction */
152 *(rp++) = cpu_to_le32(RISC_RESYNC | AUDIO_SYNC_LINE);
154 for (frame = 0; frame < NUM_AUDIO_FRAMES; frame++) {
155 databuf_offset = frame_size * frame;
159 risc_flag = RISC_CNT_RESET;
162 risc_flag = RISC_CNT_INC;
165 /* Calculate physical jump address */
166 if ((frame + 1) == NUM_AUDIO_FRAMES) {
167 risc_phys_jump_addr =
168 dev->_risc_phys_start_addr +
169 RISC_SYNC_INSTRUCTION_SIZE;
171 risc_phys_jump_addr =
172 dev->_risc_phys_start_addr +
173 RISC_SYNC_INSTRUCTION_SIZE +
174 AUDIO_RISC_DMA_BUF_SIZE * (frame + 1);
177 rp = cx25821_risc_field_upstream_audio(dev, rp,
178 dev->_audiodata_buf_phys_addr + databuf_offset,
181 if (USE_RISC_NOOP_AUDIO) {
182 for (i = 0; i < NUM_NO_OPS; i++)
183 *(rp++) = cpu_to_le32(RISC_NOOP);
186 /* Loop to (Nth)FrameRISC or to Start of Risc program &
188 *(rp++) = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | risc_flag);
189 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
190 *(rp++) = cpu_to_le32(0);
192 /* Recalculate virtual address based on frame index */
193 rp = dev->_risc_virt_addr + RISC_SYNC_INSTRUCTION_SIZE / 4 +
194 (AUDIO_RISC_DMA_BUF_SIZE * (frame + 1) / 4);
200 static void cx25821_free_memory_audio(struct cx25821_dev *dev)
202 if (dev->_risc_virt_addr) {
203 pci_free_consistent(dev->pci, dev->_audiorisc_size,
204 dev->_risc_virt_addr, dev->_risc_phys_addr);
205 dev->_risc_virt_addr = NULL;
208 if (dev->_audiodata_buf_virt_addr) {
209 pci_free_consistent(dev->pci, dev->_audiodata_buf_size,
210 dev->_audiodata_buf_virt_addr,
211 dev->_audiodata_buf_phys_addr);
212 dev->_audiodata_buf_virt_addr = NULL;
216 void cx25821_stop_upstream_audio(struct cx25821_dev *dev)
218 struct sram_channel *sram_ch =
219 dev->channels[AUDIO_UPSTREAM_SRAM_CHANNEL_B].sram_channels;
222 if (!dev->_audio_is_running) {
224 pr_fmt("No audio file is currently running so return!\n"));
227 /* Disable RISC interrupts */
228 cx_write(sram_ch->int_msk, 0);
230 /* Turn OFF risc and fifo enable in AUD_DMA_CNTRL */
231 tmp = cx_read(sram_ch->dma_ctl);
232 cx_write(sram_ch->dma_ctl,
233 tmp & ~(sram_ch->fld_aud_fifo_en | sram_ch->fld_aud_risc_en));
235 /* Clear data buffer memory */
236 if (dev->_audiodata_buf_virt_addr)
237 memset(dev->_audiodata_buf_virt_addr, 0,
238 dev->_audiodata_buf_size);
240 dev->_audio_is_running = 0;
241 dev->_is_first_audio_frame = 0;
242 dev->_audioframe_count = 0;
243 dev->_audiofile_status = END_OF_FILE;
245 kfree(dev->_irq_audio_queues);
246 dev->_irq_audio_queues = NULL;
248 kfree(dev->_audiofilename);
251 void cx25821_free_mem_upstream_audio(struct cx25821_dev *dev)
253 if (dev->_audio_is_running)
254 cx25821_stop_upstream_audio(dev);
256 cx25821_free_memory_audio(dev);
259 static int cx25821_get_audio_data(struct cx25821_dev *dev,
260 struct sram_channel *sram_ch)
263 int frame_index_temp = dev->_audioframe_index;
265 int frame_size = AUDIO_DATA_BUF_SZ;
266 int frame_offset = frame_size * frame_index_temp;
267 char mybuf[AUDIO_LINE_SIZE];
268 loff_t file_offset = dev->_audioframe_count * frame_size;
271 if (dev->_audiofile_status == END_OF_FILE)
274 file = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
276 pr_err("%s(): ERROR opening file(%s) with errno = %ld!\n",
277 __func__, dev->_audiofilename, -PTR_ERR(file));
278 return PTR_ERR(file);
281 if (dev->_audiodata_buf_virt_addr)
282 p = (char *)dev->_audiodata_buf_virt_addr + frame_offset;
284 for (i = 0; i < dev->_audio_lines_count; i++) {
285 int n = kernel_read(file, file_offset, mybuf, AUDIO_LINE_SIZE);
286 if (n < AUDIO_LINE_SIZE) {
287 pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
289 dev->_audiofile_status = END_OF_FILE;
293 dev->_audiofile_status = IN_PROGRESS;
300 dev->_audioframe_count++;
306 static void cx25821_audioups_handler(struct work_struct *work)
308 struct cx25821_dev *dev = container_of(work, struct cx25821_dev,
312 pr_err("ERROR %s(): since container_of(work_struct) FAILED!\n",
317 cx25821_get_audio_data(dev, dev->channels[dev->_audio_upstream_channel].
321 static int cx25821_openfile_audio(struct cx25821_dev *dev,
322 struct sram_channel *sram_ch)
326 int line_size = AUDIO_LINE_SIZE;
327 ssize_t vfs_read_retval = 0;
328 char mybuf[line_size];
330 loff_t offset = (unsigned long)0;
333 myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
335 if (IS_ERR(myfile)) {
336 const int open_errno = -PTR_ERR(myfile);
337 pr_err("%s(): ERROR opening file(%s) with errno = %d!\n",
338 __func__, dev->_audiofilename, open_errno);
339 return PTR_ERR(myfile);
341 if (!(myfile->f_op)) {
342 pr_err("%s(): File has no file operations registered!\n",
344 filp_close(myfile, NULL);
348 if (!myfile->f_op->read) {
349 pr_err("%s(): File has no READ operations registered!\n",
351 filp_close(myfile, NULL);
359 for (j = 0; j < NUM_AUDIO_FRAMES; j++) {
360 for (i = 0; i < dev->_audio_lines_count; i++) {
363 vfs_read_retval = vfs_read(myfile, mybuf,
366 if (vfs_read_retval > 0 &&
367 vfs_read_retval == line_size &&
368 dev->_audiodata_buf_virt_addr != NULL) {
369 memcpy((void *)(dev->
370 _audiodata_buf_virt_addr
371 + offset / 4), mybuf,
375 offset += vfs_read_retval;
377 if (vfs_read_retval < line_size) {
378 pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
385 dev->_audioframe_count++;
387 if (vfs_read_retval < line_size)
391 dev->_audiofile_status = (vfs_read_retval == line_size) ?
392 IN_PROGRESS : END_OF_FILE;
396 filp_close(myfile, NULL);
402 static int cx25821_audio_upstream_buffer_prepare(struct cx25821_dev *dev,
403 struct sram_channel *sram_ch,
408 dma_addr_t data_dma_addr;
410 cx25821_free_memory_audio(dev);
412 dev->_risc_virt_addr = pci_alloc_consistent(dev->pci,
413 dev->audio_upstream_riscbuf_size, &dma_addr);
414 dev->_risc_virt_start_addr = dev->_risc_virt_addr;
415 dev->_risc_phys_start_addr = dma_addr;
416 dev->_risc_phys_addr = dma_addr;
417 dev->_audiorisc_size = dev->audio_upstream_riscbuf_size;
419 if (!dev->_risc_virt_addr) {
421 pr_fmt("ERROR: pci_alloc_consistent() FAILED to allocate memory for RISC program! Returning\n"));
424 /* Clear out memory at address */
425 memset(dev->_risc_virt_addr, 0, dev->_audiorisc_size);
427 /* For Audio Data buffer allocation */
428 dev->_audiodata_buf_virt_addr = pci_alloc_consistent(dev->pci,
429 dev->audio_upstream_databuf_size, &data_dma_addr);
430 dev->_audiodata_buf_phys_addr = data_dma_addr;
431 dev->_audiodata_buf_size = dev->audio_upstream_databuf_size;
433 if (!dev->_audiodata_buf_virt_addr) {
435 pr_fmt("ERROR: pci_alloc_consistent() FAILED to allocate memory for data buffer! Returning\n"));
438 /* Clear out memory at address */
439 memset(dev->_audiodata_buf_virt_addr, 0, dev->_audiodata_buf_size);
441 ret = cx25821_openfile_audio(dev, sram_ch);
445 /* Creating RISC programs */
446 ret = cx25821_risc_buffer_upstream_audio(dev, dev->pci, bpl,
447 dev->_audio_lines_count);
450 pr_fmt("ERROR creating audio upstream RISC programs!\n"));
460 static int cx25821_audio_upstream_irq(struct cx25821_dev *dev, int chan_num,
465 struct sram_channel *channel = dev->channels[chan_num].sram_channels;
466 dma_addr_t risc_phys_jump_addr;
469 if (status & FLD_AUD_SRC_RISCI1) {
470 /* Get interrupt_index of the program that interrupted */
471 u32 prog_cnt = cx_read(channel->gpcnt);
473 /* Since we've identified our IRQ, clear our bits from the
474 * interrupt mask and interrupt status registers */
475 cx_write(channel->int_msk, 0);
476 cx_write(channel->int_stat, cx_read(channel->int_stat));
478 spin_lock(&dev->slock);
480 while (prog_cnt != dev->_last_index_irq) {
481 /* Update _last_index_irq */
482 if (dev->_last_index_irq < (NUMBER_OF_PROGRAMS - 1))
483 dev->_last_index_irq++;
485 dev->_last_index_irq = 0;
487 dev->_audioframe_index = dev->_last_index_irq;
489 queue_work(dev->_irq_audio_queues,
490 &dev->_audio_work_entry);
493 if (dev->_is_first_audio_frame) {
494 dev->_is_first_audio_frame = 0;
496 if (dev->_risc_virt_start_addr != NULL) {
497 risc_phys_jump_addr =
498 dev->_risc_phys_start_addr +
499 RISC_SYNC_INSTRUCTION_SIZE +
500 AUDIO_RISC_DMA_BUF_SIZE;
502 rp = cx25821_risc_field_upstream_audio(dev,
503 dev->_risc_virt_start_addr + 1,
504 dev->_audiodata_buf_phys_addr,
505 AUDIO_LINE_SIZE, FIFO_DISABLE);
507 if (USE_RISC_NOOP_AUDIO) {
508 for (i = 0; i < NUM_NO_OPS; i++) {
510 cpu_to_le32(RISC_NOOP);
513 /* Jump to 2nd Audio Frame */
514 *(rp++) = cpu_to_le32(RISC_JUMP | RISC_IRQ1 |
516 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
517 *(rp++) = cpu_to_le32(0);
521 spin_unlock(&dev->slock);
523 if (status & FLD_AUD_SRC_OF)
524 pr_warn("%s(): Audio Received Overflow Error Interrupt!\n",
527 if (status & FLD_AUD_SRC_SYNC)
528 pr_warn("%s(): Audio Received Sync Error Interrupt!\n",
531 if (status & FLD_AUD_SRC_OPC_ERR)
532 pr_warn("%s(): Audio Received OpCode Error Interrupt!\n",
535 /* Read and write back the interrupt status register to clear
537 cx_write(channel->int_stat, cx_read(channel->int_stat));
540 if (dev->_audiofile_status == END_OF_FILE) {
541 pr_warn("EOF Channel Audio Framecount = %d\n",
542 dev->_audioframe_count);
545 /* ElSE, set the interrupt mask register, re-enable irq. */
546 int_msk_tmp = cx_read(channel->int_msk);
547 cx_write(channel->int_msk, int_msk_tmp |= _intr_msk);
552 static irqreturn_t cx25821_upstream_irq_audio(int irq, void *dev_id)
554 struct cx25821_dev *dev = dev_id;
557 struct sram_channel *sram_ch;
562 sram_ch = dev->channels[dev->_audio_upstream_channel].sram_channels;
564 audio_status = cx_read(sram_ch->int_stat);
566 /* Only deal with our interrupt */
568 handled = cx25821_audio_upstream_irq(dev,
569 dev->_audio_upstream_channel, audio_status);
573 cx25821_stop_upstream_audio(dev);
577 return IRQ_RETVAL(handled);
580 static void cx25821_wait_fifo_enable(struct cx25821_dev *dev,
581 struct sram_channel *sram_ch)
587 /* Wait 10 microsecond before checking to see if the FIFO is
591 tmp = cx_read(sram_ch->dma_ctl);
593 /* 10 millisecond timeout */
594 if (count++ > 1000) {
595 pr_err("ERROR: %s() fifo is NOT turned on. Timeout!\n",
600 } while (!(tmp & sram_ch->fld_aud_fifo_en));
604 static int cx25821_start_audio_dma_upstream(struct cx25821_dev *dev,
605 struct sram_channel *sram_ch)
610 /* Set the physical start address of the RISC program in the initial
611 * program counter(IPC) member of the CMDS. */
612 cx_write(sram_ch->cmds_start + 0, dev->_risc_phys_addr);
613 /* Risc IPC High 64 bits 63-32 */
614 cx_write(sram_ch->cmds_start + 4, 0);
617 cx_write(sram_ch->gpcnt_ctl, 3);
619 /* Set the line length (It looks like we do not need to set the
621 cx_write(sram_ch->aud_length, AUDIO_LINE_SIZE & FLD_AUD_DST_LN_LNGTH);
623 /* Set the input mode to 16-bit */
624 tmp = cx_read(sram_ch->aud_cfg);
625 tmp |= FLD_AUD_SRC_ENABLE | FLD_AUD_DST_PK_MODE | FLD_AUD_CLK_ENABLE |
626 FLD_AUD_MASTER_MODE | FLD_AUD_CLK_SELECT_PLL_D |
628 cx_write(sram_ch->aud_cfg, tmp);
630 /* Read and write back the interrupt status register to clear it */
631 tmp = cx_read(sram_ch->int_stat);
632 cx_write(sram_ch->int_stat, tmp);
634 /* Clear our bits from the interrupt status register. */
635 cx_write(sram_ch->int_stat, _intr_msk);
637 /* Set the interrupt mask register, enable irq. */
638 cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << sram_ch->irq_bit));
639 tmp = cx_read(sram_ch->int_msk);
640 cx_write(sram_ch->int_msk, tmp |= _intr_msk);
642 err = request_irq(dev->pci->irq, cx25821_upstream_irq_audio,
643 IRQF_SHARED, dev->name, dev);
645 pr_err("%s: can't get upstream IRQ %d\n", dev->name,
650 /* Start the DMA engine */
651 tmp = cx_read(sram_ch->dma_ctl);
652 cx_set(sram_ch->dma_ctl, tmp | sram_ch->fld_aud_risc_en);
654 dev->_audio_is_running = 1;
655 dev->_is_first_audio_frame = 1;
657 /* The fifo_en bit turns on by the first Risc program */
658 cx25821_wait_fifo_enable(dev, sram_ch);
663 cx25821_dev_unregister(dev);
667 int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
669 struct sram_channel *sram_ch;
672 if (dev->_audio_is_running) {
673 pr_warn("Audio Channel is still running so return!\n");
677 dev->_audio_upstream_channel = channel_select;
678 sram_ch = dev->channels[channel_select].sram_channels;
681 INIT_WORK(&dev->_audio_work_entry, cx25821_audioups_handler);
682 dev->_irq_audio_queues =
683 create_singlethread_workqueue("cx25821_audioworkqueue");
685 if (!dev->_irq_audio_queues) {
687 pr_fmt("ERROR: create_singlethread_workqueue() for Audio FAILED!\n"));
691 dev->_last_index_irq = 0;
692 dev->_audio_is_running = 0;
693 dev->_audioframe_count = 0;
694 dev->_audiofile_status = RESET_STATUS;
695 dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER;
696 _line_size = AUDIO_LINE_SIZE;
698 if (dev->input_audiofilename) {
699 dev->_audiofilename = kstrdup(dev->input_audiofilename,
702 if (!dev->_audiofilename) {
707 /* Default if filename is empty string */
708 if (strcmp(dev->input_audiofilename, "") == 0)
709 dev->_audiofilename = "/root/audioGOOD.wav";
711 dev->_audiofilename = kstrdup(_defaultAudioName,
714 if (!dev->_audiofilename) {
720 cx25821_sram_channel_setup_upstream_audio(dev, sram_ch,
723 dev->audio_upstream_riscbuf_size =
724 AUDIO_RISC_DMA_BUF_SIZE * NUM_AUDIO_PROGS +
725 RISC_SYNC_INSTRUCTION_SIZE;
726 dev->audio_upstream_databuf_size = AUDIO_DATA_BUF_SZ * NUM_AUDIO_PROGS;
728 /* Allocating buffers and prepare RISC program */
729 err = cx25821_audio_upstream_buffer_prepare(dev, sram_ch,
732 pr_err("%s: Failed to set up Audio upstream buffers!\n",
736 /* Start RISC engine */
737 cx25821_start_audio_dma_upstream(dev, sram_ch);
742 cx25821_dev_unregister(dev);