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 #include "cx25821-video.h"
24 #include "cx25821-audio-upstream.h"
27 #include <linux/errno.h>
28 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/module.h>
31 #include <linux/syscalls.h>
32 #include <linux/file.h>
33 #include <linux/fcntl.h>
34 #include <linux/delay.h>
35 #include <linux/slab.h>
36 #include <asm/uaccess.h>
38 MODULE_DESCRIPTION("v4l2 driver module for cx25821 based TV cards");
39 MODULE_AUTHOR("Hiep Huynh <hiep.huynh@conexant.com>");
40 MODULE_LICENSE("GPL");
42 static int _intr_msk =
43 FLD_AUD_SRC_RISCI1 | FLD_AUD_SRC_OF | FLD_AUD_SRC_SYNC |
46 int cx25821_sram_channel_setup_upstream_audio(struct cx25821_dev *dev,
47 struct sram_channel *ch,
48 unsigned int bpl, u32 risc)
50 unsigned int i, lines;
53 if (ch->cmds_start == 0) {
54 cx_write(ch->ptr1_reg, 0);
55 cx_write(ch->ptr2_reg, 0);
56 cx_write(ch->cnt2_reg, 0);
57 cx_write(ch->cnt1_reg, 0);
61 bpl = (bpl + 7) & ~7; /* alignment */
63 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->sram_channels[dev->_audio_upstream_channel_select];
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 after the first 3 lines
120 // For the upstream audio channel, the risc engine will enable the FIFO.
121 if (fifo_enable && line == 2) {
122 *(rp++) = RISC_WRITECR;
123 *(rp++) = sram_ch->dma_ctl;
124 *(rp++) = sram_ch->fld_aud_fifo_en;
125 *(rp++) = 0x00000020;
128 offset += AUDIO_LINE_SIZE;
134 int cx25821_risc_buffer_upstream_audio(struct cx25821_dev *dev,
136 unsigned int bpl, unsigned int lines)
140 int frame = 0, i = 0;
141 int frame_size = AUDIO_DATA_BUF_SZ;
142 int databuf_offset = 0;
143 int risc_flag = RISC_CNT_INC;
144 dma_addr_t risc_phys_jump_addr;
146 /* Virtual address of Risc buffer program */
147 rp = dev->_risc_virt_addr;
149 /* sync instruction */
150 *(rp++) = cpu_to_le32(RISC_RESYNC | AUDIO_SYNC_LINE);
152 for (frame = 0; frame < NUM_AUDIO_FRAMES; frame++) {
153 databuf_offset = frame_size * frame;
157 risc_flag = RISC_CNT_RESET;
160 risc_flag = RISC_CNT_INC;
163 //Calculate physical jump address
164 if ((frame + 1) == NUM_AUDIO_FRAMES) {
165 risc_phys_jump_addr =
166 dev->_risc_phys_start_addr +
167 RISC_SYNC_INSTRUCTION_SIZE;
169 risc_phys_jump_addr =
170 dev->_risc_phys_start_addr +
171 RISC_SYNC_INSTRUCTION_SIZE +
172 AUDIO_RISC_DMA_BUF_SIZE * (frame + 1);
175 rp = cx25821_risc_field_upstream_audio(dev, rp,
177 _audiodata_buf_phys_addr
178 + databuf_offset, bpl,
181 if (USE_RISC_NOOP_AUDIO) {
182 for (i = 0; i < NUM_NO_OPS; i++) {
183 *(rp++) = cpu_to_le32(RISC_NOOP);
187 // Loop to (Nth)FrameRISC or to Start of Risc program & generate IRQ
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 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->sram_channels[AUDIO_UPSTREAM_SRAM_CHANNEL_B];
222 if (!dev->_audio_is_running) {
224 ("cx25821: 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 if (dev->_irq_audio_queues) {
246 kfree(dev->_irq_audio_queues);
247 dev->_irq_audio_queues = NULL;
250 if (dev->_audiofilename != NULL)
251 kfree(dev->_audiofilename);
254 void cx25821_free_mem_upstream_audio(struct cx25821_dev *dev)
256 if (dev->_audio_is_running) {
257 cx25821_stop_upstream_audio(dev);
260 cx25821_free_memory_audio(dev);
263 int cx25821_get_audio_data(struct cx25821_dev *dev,
264 struct sram_channel *sram_ch)
267 int frame_index_temp = dev->_audioframe_index;
269 int line_size = AUDIO_LINE_SIZE;
270 int frame_size = AUDIO_DATA_BUF_SZ;
271 int frame_offset = frame_size * frame_index_temp;
272 ssize_t vfs_read_retval = 0;
273 char mybuf[line_size];
274 loff_t file_offset = dev->_audioframe_count * frame_size;
278 if (dev->_audiofile_status == END_OF_FILE)
281 myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
283 if (IS_ERR(myfile)) {
284 const int open_errno = -PTR_ERR(myfile);
285 printk("%s(): ERROR opening file(%s) with errno = %d! \n",
286 __func__, dev->_audiofilename, open_errno);
287 return PTR_ERR(myfile);
289 if (!(myfile->f_op)) {
290 printk("%s: File has no file operations registered!\n",
292 filp_close(myfile, NULL);
296 if (!myfile->f_op->read) {
297 printk("%s: File has no READ operations registered! \n",
299 filp_close(myfile, NULL);
307 for (i = 0; i < dev->_audio_lines_count; i++) {
311 vfs_read(myfile, mybuf, line_size, &pos);
313 if (vfs_read_retval > 0 && vfs_read_retval == line_size
314 && dev->_audiodata_buf_virt_addr != NULL) {
315 memcpy((void *)(dev->_audiodata_buf_virt_addr +
316 frame_offset / 4), mybuf,
320 file_offset += vfs_read_retval;
321 frame_offset += vfs_read_retval;
323 if (vfs_read_retval < line_size) {
325 "Done: exit %s() since no more bytes to read from Audio file.\n",
332 dev->_audioframe_count++;
334 dev->_audiofile_status =
335 (vfs_read_retval == line_size) ? IN_PROGRESS : END_OF_FILE;
338 filp_close(myfile, NULL);
344 static void cx25821_audioups_handler(struct work_struct *work)
346 struct cx25821_dev *dev =
347 container_of(work, struct cx25821_dev, _audio_work_entry);
350 printk("ERROR %s(): since container_of(work_struct) FAILED! \n",
355 cx25821_get_audio_data(dev,
356 &dev->sram_channels[dev->
357 _audio_upstream_channel_select]);
360 int cx25821_openfile_audio(struct cx25821_dev *dev,
361 struct sram_channel *sram_ch)
365 int line_size = AUDIO_LINE_SIZE;
366 ssize_t vfs_read_retval = 0;
367 char mybuf[line_size];
369 loff_t offset = (unsigned long)0;
372 myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
374 if (IS_ERR(myfile)) {
375 const int open_errno = -PTR_ERR(myfile);
376 printk("%s(): ERROR opening file(%s) with errno = %d! \n",
377 __func__, dev->_audiofilename, open_errno);
378 return PTR_ERR(myfile);
380 if (!(myfile->f_op)) {
381 printk("%s: File has no file operations registered! \n",
383 filp_close(myfile, NULL);
387 if (!myfile->f_op->read) {
388 printk("%s: File has no READ operations registered! \n",
390 filp_close(myfile, NULL);
398 for (j = 0; j < NUM_AUDIO_FRAMES; j++) {
399 for (i = 0; i < dev->_audio_lines_count; i++) {
403 vfs_read(myfile, mybuf, line_size, &pos);
405 if (vfs_read_retval > 0
406 && vfs_read_retval == line_size
407 && dev->_audiodata_buf_virt_addr != NULL) {
408 memcpy((void *)(dev->
409 _audiodata_buf_virt_addr
410 + offset / 4), mybuf,
414 offset += vfs_read_retval;
416 if (vfs_read_retval < line_size) {
418 "Done: exit %s() since no more bytes to read from Audio file.\n",
425 dev->_audioframe_count++;
428 if (vfs_read_retval < line_size) {
433 dev->_audiofile_status =
434 (vfs_read_retval == line_size) ? IN_PROGRESS : END_OF_FILE;
438 filp_close(myfile, NULL);
444 static int cx25821_audio_upstream_buffer_prepare(struct cx25821_dev *dev,
445 struct sram_channel *sram_ch,
450 dma_addr_t data_dma_addr;
452 cx25821_free_memory_audio(dev);
454 dev->_risc_virt_addr =
455 pci_alloc_consistent(dev->pci, dev->audio_upstream_riscbuf_size,
457 dev->_risc_virt_start_addr = dev->_risc_virt_addr;
458 dev->_risc_phys_start_addr = dma_addr;
459 dev->_risc_phys_addr = dma_addr;
460 dev->_audiorisc_size = dev->audio_upstream_riscbuf_size;
462 if (!dev->_risc_virt_addr) {
464 ("cx25821 ERROR: pci_alloc_consistent() FAILED to allocate memory for RISC program! Returning.\n");
467 //Clear out memory at address
468 memset(dev->_risc_virt_addr, 0, dev->_audiorisc_size);
470 //For Audio Data buffer allocation
471 dev->_audiodata_buf_virt_addr =
472 pci_alloc_consistent(dev->pci, dev->audio_upstream_databuf_size,
474 dev->_audiodata_buf_phys_addr = data_dma_addr;
475 dev->_audiodata_buf_size = dev->audio_upstream_databuf_size;
477 if (!dev->_audiodata_buf_virt_addr) {
479 ("cx25821 ERROR: pci_alloc_consistent() FAILED to allocate memory for data buffer! Returning. \n");
482 //Clear out memory at address
483 memset(dev->_audiodata_buf_virt_addr, 0, dev->_audiodata_buf_size);
485 ret = cx25821_openfile_audio(dev, sram_ch);
489 //Creating RISC programs
491 cx25821_risc_buffer_upstream_audio(dev, dev->pci, bpl,
492 dev->_audio_lines_count);
495 "cx25821 ERROR creating audio upstream RISC programs! \n");
505 int cx25821_audio_upstream_irq(struct cx25821_dev *dev, int chan_num,
510 struct sram_channel *channel = &dev->sram_channels[chan_num];
511 dma_addr_t risc_phys_jump_addr;
514 if (status & FLD_AUD_SRC_RISCI1) {
515 //Get interrupt_index of the program that interrupted
516 u32 prog_cnt = cx_read(channel->gpcnt);
518 //Since we've identified our IRQ, clear our bits from the interrupt mask and interrupt status registers
519 cx_write(channel->int_msk, 0);
520 cx_write(channel->int_stat, cx_read(channel->int_stat));
522 spin_lock(&dev->slock);
524 while (prog_cnt != dev->_last_index_irq) {
525 //Update _last_index_irq
526 if (dev->_last_index_irq < (NUMBER_OF_PROGRAMS - 1)) {
527 dev->_last_index_irq++;
529 dev->_last_index_irq = 0;
532 dev->_audioframe_index = dev->_last_index_irq;
534 queue_work(dev->_irq_audio_queues,
535 &dev->_audio_work_entry);
538 if (dev->_is_first_audio_frame) {
539 dev->_is_first_audio_frame = 0;
541 if (dev->_risc_virt_start_addr != NULL) {
542 risc_phys_jump_addr =
543 dev->_risc_phys_start_addr +
544 RISC_SYNC_INSTRUCTION_SIZE +
545 AUDIO_RISC_DMA_BUF_SIZE;
547 rp = cx25821_risc_field_upstream_audio(dev,
549 _risc_virt_start_addr
552 _audiodata_buf_phys_addr,
556 if (USE_RISC_NOOP_AUDIO) {
557 for (i = 0; i < NUM_NO_OPS; i++) {
559 cpu_to_le32(RISC_NOOP);
562 // Jump to 2nd Audio Frame
564 cpu_to_le32(RISC_JUMP | RISC_IRQ1 |
566 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
567 *(rp++) = cpu_to_le32(0);
571 spin_unlock(&dev->slock);
573 if (status & FLD_AUD_SRC_OF)
574 printk("%s: Audio Received Overflow Error Interrupt!\n",
577 if (status & FLD_AUD_SRC_SYNC)
578 printk("%s: Audio Received Sync Error Interrupt!\n",
581 if (status & FLD_AUD_SRC_OPC_ERR)
582 printk("%s: Audio Received OpCode Error Interrupt!\n",
585 // Read and write back the interrupt status register to clear our bits
586 cx_write(channel->int_stat, cx_read(channel->int_stat));
589 if (dev->_audiofile_status == END_OF_FILE) {
590 printk("cx25821: EOF Channel Audio Framecount = %d\n",
591 dev->_audioframe_count);
594 //ElSE, set the interrupt mask register, re-enable irq.
595 int_msk_tmp = cx_read(channel->int_msk);
596 cx_write(channel->int_msk, int_msk_tmp |= _intr_msk);
601 static irqreturn_t cx25821_upstream_irq_audio(int irq, void *dev_id)
603 struct cx25821_dev *dev = dev_id;
604 u32 msk_stat, audio_status;
606 struct sram_channel *sram_ch;
611 sram_ch = &dev->sram_channels[dev->_audio_upstream_channel_select];
613 msk_stat = cx_read(sram_ch->int_mstat);
614 audio_status = cx_read(sram_ch->int_stat);
616 // Only deal with our interrupt
619 cx25821_audio_upstream_irq(dev,
621 _audio_upstream_channel_select,
626 cx25821_stop_upstream_audio(dev);
631 return IRQ_RETVAL(handled);
634 static void cx25821_wait_fifo_enable(struct cx25821_dev *dev,
635 struct sram_channel *sram_ch)
641 //Wait 10 microsecond before checking to see if the FIFO is turned ON.
644 tmp = cx_read(sram_ch->dma_ctl);
646 if (count++ > 1000) //10 millisecond timeout
649 ("cx25821 ERROR: %s() fifo is NOT turned on. Timeout!\n",
654 } while (!(tmp & sram_ch->fld_aud_fifo_en));
658 int cx25821_start_audio_dma_upstream(struct cx25821_dev *dev,
659 struct sram_channel *sram_ch)
664 // Set the physical start address of the RISC program in the initial program counter(IPC) member of the CMDS.
665 cx_write(sram_ch->cmds_start + 0, dev->_risc_phys_addr);
666 cx_write(sram_ch->cmds_start + 4, 0); /* Risc IPC High 64 bits 63-32 */
669 cx_write(sram_ch->gpcnt_ctl, 3);
671 //Set the line length (It looks like we do not need to set the line length)
672 cx_write(sram_ch->aud_length, AUDIO_LINE_SIZE & FLD_AUD_DST_LN_LNGTH);
674 //Set the input mode to 16-bit
675 tmp = cx_read(sram_ch->aud_cfg);
677 FLD_AUD_SRC_ENABLE | FLD_AUD_DST_PK_MODE | FLD_AUD_CLK_ENABLE |
678 FLD_AUD_MASTER_MODE | FLD_AUD_CLK_SELECT_PLL_D | FLD_AUD_SONY_MODE;
679 cx_write(sram_ch->aud_cfg, tmp);
681 // Read and write back the interrupt status register to clear it
682 tmp = cx_read(sram_ch->int_stat);
683 cx_write(sram_ch->int_stat, tmp);
685 // Clear our bits from the interrupt status register.
686 cx_write(sram_ch->int_stat, _intr_msk);
688 //Set the interrupt mask register, enable irq.
689 cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << sram_ch->irq_bit));
690 tmp = cx_read(sram_ch->int_msk);
691 cx_write(sram_ch->int_msk, tmp |= _intr_msk);
694 request_irq(dev->pci->irq, cx25821_upstream_irq_audio,
695 IRQF_SHARED | IRQF_DISABLED, dev->name, dev);
697 printk(KERN_ERR "%s: can't get upstream IRQ %d\n", dev->name,
702 // Start the DMA engine
703 tmp = cx_read(sram_ch->dma_ctl);
704 cx_set(sram_ch->dma_ctl, tmp | sram_ch->fld_aud_risc_en);
706 dev->_audio_is_running = 1;
707 dev->_is_first_audio_frame = 1;
709 // The fifo_en bit turns on by the first Risc program
710 cx25821_wait_fifo_enable(dev, sram_ch);
715 cx25821_dev_unregister(dev);
719 int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
721 struct sram_channel *sram_ch;
726 if (dev->_audio_is_running) {
727 printk("Audio Channel is still running so return!\n");
731 dev->_audio_upstream_channel_select = channel_select;
732 sram_ch = &dev->sram_channels[channel_select];
735 INIT_WORK(&dev->_audio_work_entry, cx25821_audioups_handler);
736 dev->_irq_audio_queues =
737 create_singlethread_workqueue("cx25821_audioworkqueue");
739 if (!dev->_irq_audio_queues) {
741 ("cx25821 ERROR: create_singlethread_workqueue() for Audio FAILED!\n");
745 dev->_last_index_irq = 0;
746 dev->_audio_is_running = 0;
747 dev->_audioframe_count = 0;
748 dev->_audiofile_status = RESET_STATUS;
749 dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER;
750 _line_size = AUDIO_LINE_SIZE;
752 if (dev->input_audiofilename) {
753 str_length = strlen(dev->input_audiofilename);
754 dev->_audiofilename =
755 (char *)kmalloc(str_length + 1, GFP_KERNEL);
757 if (!dev->_audiofilename)
760 memcpy(dev->_audiofilename, dev->input_audiofilename,
763 //Default if filename is empty string
764 if (strcmp(dev->input_audiofilename, "") == 0) {
765 dev->_audiofilename = "/root/audioGOOD.wav";
768 str_length = strlen(_defaultAudioName);
769 dev->_audiofilename =
770 (char *)kmalloc(str_length + 1, GFP_KERNEL);
772 if (!dev->_audiofilename)
775 memcpy(dev->_audiofilename, _defaultAudioName, str_length + 1);
779 cx25821_sram_channel_setup_upstream_audio(dev, sram_ch, _line_size,
782 dev->audio_upstream_riscbuf_size =
783 AUDIO_RISC_DMA_BUF_SIZE * NUM_AUDIO_PROGS +
784 RISC_SYNC_INSTRUCTION_SIZE;
785 dev->audio_upstream_databuf_size = AUDIO_DATA_BUF_SZ * NUM_AUDIO_PROGS;
787 //Allocating buffers and prepare RISC program
789 cx25821_audio_upstream_buffer_prepare(dev, sram_ch, _line_size);
792 "%s: Failed to set up Audio upstream buffers!\n",
797 cx25821_start_audio_dma_upstream(dev, sram_ch);
802 cx25821_dev_unregister(dev);