2 * bf5xx-ac97.c -- AC97 support for the ADI blackfin chip.
5 * Created: 11th. June 2007
6 * Copyright: Analog Device Inc.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/interrupt.h>
17 #include <linux/wait.h>
18 #include <linux/delay.h>
20 #include <sound/core.h>
21 #include <sound/pcm.h>
22 #include <sound/ac97_codec.h>
23 #include <sound/initval.h>
24 #include <sound/soc.h>
27 #include <asm/portmux.h>
28 #include <linux/mutex.h>
29 #include <linux/gpio.h>
31 #include "bf5xx-sport.h"
32 #include "bf5xx-ac97.h"
34 static int *cmd_count;
35 static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM;
37 #define SPORT_REQ(x) \
38 [x] = {P_SPORT##x##_TFS, P_SPORT##x##_DTPRI, P_SPORT##x##_TSCLK, \
39 P_SPORT##x##_RFS, P_SPORT##x##_DRPRI, P_SPORT##x##_RSCLK, 0}
40 static u16 sport_req[][7] = {
55 #define SPORT_PARAMS(x) \
57 .dma_rx_chan = CH_SPORT##x##_RX, \
58 .dma_tx_chan = CH_SPORT##x##_TX, \
59 .err_irq = IRQ_SPORT##x##_ERROR, \
60 .regs = (struct sport_register *)SPORT##x##_TCR1, \
62 static struct sport_param sport_params[4] = {
77 void bf5xx_pcm_to_ac97(struct ac97_frame *dst, const __u16 *src,
78 size_t count, unsigned int chan_mask)
81 dst->ac97_tag = TAG_VALID;
82 if (chan_mask & SP_FL) {
83 dst->ac97_pcm_r = *src++;
84 dst->ac97_tag |= TAG_PCM_RIGHT;
86 if (chan_mask & SP_FR) {
87 dst->ac97_pcm_l = *src++;
88 dst->ac97_tag |= TAG_PCM_LEFT;
91 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
92 if (chan_mask & SP_SR) {
93 dst->ac97_sl = *src++;
94 dst->ac97_tag |= TAG_PCM_SL;
96 if (chan_mask & SP_SL) {
97 dst->ac97_sr = *src++;
98 dst->ac97_tag |= TAG_PCM_SR;
100 if (chan_mask & SP_LFE) {
101 dst->ac97_lfe = *src++;
102 dst->ac97_tag |= TAG_PCM_LFE;
104 if (chan_mask & SP_FC) {
105 dst->ac97_center = *src++;
106 dst->ac97_tag |= TAG_PCM_CENTER;
112 EXPORT_SYMBOL(bf5xx_pcm_to_ac97);
114 void bf5xx_ac97_to_pcm(const struct ac97_frame *src, __u16 *dst,
118 *(dst++) = src->ac97_pcm_l;
119 *(dst++) = src->ac97_pcm_r;
123 EXPORT_SYMBOL(bf5xx_ac97_to_pcm);
125 static unsigned int sport_tx_curr_frag(struct sport_device *sport)
127 return sport->tx_curr_frag = sport_curr_offset_tx(sport) /
131 static void enqueue_cmd(struct snd_ac97 *ac97, __u16 addr, __u16 data)
133 struct sport_device *sport = sport_handle;
134 int nextfrag = sport_tx_curr_frag(sport);
135 struct ac97_frame *nextwrite;
137 sport_incfrag(sport, &nextfrag, 1);
139 nextwrite = (struct ac97_frame *)(sport->tx_buf +
140 nextfrag * sport->tx_fragsize);
141 pr_debug("sport->tx_buf:%p, nextfrag:0x%x nextwrite:%p, cmd_count:%d\n",
142 sport->tx_buf, nextfrag, nextwrite, cmd_count[nextfrag]);
143 nextwrite[cmd_count[nextfrag]].ac97_tag |= TAG_CMD;
144 nextwrite[cmd_count[nextfrag]].ac97_addr = addr;
145 nextwrite[cmd_count[nextfrag]].ac97_data = data;
146 ++cmd_count[nextfrag];
147 pr_debug("ac97_sport: Inserting %02x/%04x into fragment %d\n",
148 addr >> 8, data, nextfrag);
151 static unsigned short bf5xx_ac97_read(struct snd_ac97 *ac97,
154 struct ac97_frame out_frame[2], in_frame[2];
156 pr_debug("%s enter 0x%x\n", __func__, reg);
158 /* When dma descriptor is enabled, the register should not be read */
159 if (sport_handle->tx_run || sport_handle->rx_run) {
160 pr_err("Could you send a mail to cliff.cai@analog.com "
161 "to report this?\n");
165 memset(&out_frame, 0, 2 * sizeof(struct ac97_frame));
166 memset(&in_frame, 0, 2 * sizeof(struct ac97_frame));
167 out_frame[0].ac97_tag = TAG_VALID | TAG_CMD;
168 out_frame[0].ac97_addr = ((reg << 8) | 0x8000);
169 sport_send_and_recv(sport_handle, (unsigned char *)&out_frame,
170 (unsigned char *)&in_frame,
171 2 * sizeof(struct ac97_frame));
172 return in_frame[1].ac97_data;
175 void bf5xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
178 pr_debug("%s enter 0x%x:0x%04x\n", __func__, reg, val);
180 if (sport_handle->tx_run) {
181 enqueue_cmd(ac97, (reg << 8), val); /* write */
182 enqueue_cmd(ac97, (reg << 8) | 0x8000, 0); /* read back */
184 struct ac97_frame frame;
185 memset(&frame, 0, sizeof(struct ac97_frame));
186 frame.ac97_tag = TAG_VALID | TAG_CMD;
187 frame.ac97_addr = (reg << 8);
188 frame.ac97_data = val;
189 sport_send_and_recv(sport_handle, (unsigned char *)&frame, \
190 NULL, sizeof(struct ac97_frame));
194 static void bf5xx_ac97_warm_reset(struct snd_ac97 *ac97)
196 #if defined(CONFIG_BF54x) || defined(CONFIG_BF561) || \
197 (defined(BF537_FAMILY) && (CONFIG_SND_BF5XX_SPORT_NUM == 1))
199 #define CONCAT(a, b, c) a ## b ## c
200 #define BFIN_SPORT_RFS(x) CONCAT(P_SPORT, x, _RFS)
202 u16 per = BFIN_SPORT_RFS(CONFIG_SND_BF5XX_SPORT_NUM);
203 u16 gpio = P_IDENT(BFIN_SPORT_RFS(CONFIG_SND_BF5XX_SPORT_NUM));
205 pr_debug("%s enter\n", __func__);
207 peripheral_free(per);
208 gpio_request(gpio, "bf5xx-ac97");
209 gpio_direction_output(gpio, 1);
211 gpio_set_value(gpio, 0);
214 peripheral_request(per, "soc-audio");
216 pr_info("%s: Not implemented\n", __func__);
220 static void bf5xx_ac97_cold_reset(struct snd_ac97 *ac97)
222 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
223 pr_debug("%s enter\n", __func__);
225 /* It is specified for bf548-ezkit */
226 gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 0);
227 /* Keep reset pin low for 1 ms */
229 gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
230 /* Wait for bit clock recover */
233 pr_info("%s: Not implemented\n", __func__);
237 struct snd_ac97_bus_ops soc_ac97_ops = {
238 .read = bf5xx_ac97_read,
239 .write = bf5xx_ac97_write,
240 .warm_reset = bf5xx_ac97_warm_reset,
241 .reset = bf5xx_ac97_cold_reset,
243 EXPORT_SYMBOL_GPL(soc_ac97_ops);
246 static int bf5xx_ac97_suspend(struct snd_soc_dai *dai)
248 struct sport_device *sport =
249 (struct sport_device *)dai->private_data;
251 pr_debug("%s : sport %d\n", __func__, dai->id);
254 if (dai->capture.active)
255 sport_rx_stop(sport);
256 if (dai->playback.active)
257 sport_tx_stop(sport);
261 static int bf5xx_ac97_resume(struct snd_soc_dai *dai)
264 struct sport_device *sport =
265 (struct sport_device *)dai->private_data;
267 pr_debug("%s : sport %d\n", __func__, dai->id);
271 ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1);
273 pr_err("SPORT is busy!\n");
277 ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1));
279 pr_err("SPORT is busy!\n");
283 ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1));
285 pr_err("SPORT is busy!\n");
289 if (dai->capture.active)
290 sport_rx_start(sport);
291 if (dai->playback.active)
292 sport_tx_start(sport);
297 #define bf5xx_ac97_suspend NULL
298 #define bf5xx_ac97_resume NULL
301 static int bf5xx_ac97_probe(struct platform_device *pdev,
302 struct snd_soc_dai *dai)
305 cmd_count = (int *)get_zeroed_page(GFP_KERNEL);
306 if (cmd_count == NULL)
309 if (peripheral_request_list(sport_req[sport_num], "soc-audio")) {
310 pr_err("Requesting Peripherals failed\n");
315 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
316 /* Request PB3 as reset pin */
317 if (gpio_request(CONFIG_SND_BF5XX_RESET_GPIO_NUM, "SND_AD198x RESET")) {
318 pr_err("Failed to request GPIO_%d for reset\n",
319 CONFIG_SND_BF5XX_RESET_GPIO_NUM);
323 gpio_direction_output(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
325 sport_handle = sport_init(&sport_params[sport_num], 2, \
326 sizeof(struct ac97_frame), NULL);
331 /*SPORT works in TDM mode to simulate AC97 transfers*/
332 ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1);
334 pr_err("SPORT is busy!\n");
336 goto sport_config_err;
339 ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1));
341 pr_err("SPORT is busy!\n");
343 goto sport_config_err;
346 ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1));
348 pr_err("SPORT is busy!\n");
350 goto sport_config_err;
358 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
359 gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
362 peripheral_free_list(sport_req[sport_num]);
364 free_page((unsigned long)cmd_count);
370 static void bf5xx_ac97_remove(struct platform_device *pdev,
371 struct snd_soc_dai *dai)
373 free_page((unsigned long)cmd_count);
375 peripheral_free_list(sport_req[sport_num]);
376 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
377 gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
381 struct snd_soc_dai bfin_ac97_dai = {
382 .name = "bf5xx-ac97",
385 .probe = bf5xx_ac97_probe,
386 .remove = bf5xx_ac97_remove,
387 .suspend = bf5xx_ac97_suspend,
388 .resume = bf5xx_ac97_resume,
390 .stream_name = "AC97 Playback",
392 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
397 .rates = SNDRV_PCM_RATE_48000,
398 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
400 .stream_name = "AC97 Capture",
403 .rates = SNDRV_PCM_RATE_48000,
404 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
406 EXPORT_SYMBOL_GPL(bfin_ac97_dai);
408 static int __init bfin_ac97_init(void)
410 return snd_soc_register_dai(&bfin_ac97_dai);
412 module_init(bfin_ac97_init);
414 static void __exit bfin_ac97_exit(void)
416 snd_soc_unregister_dai(&bfin_ac97_dai);
418 module_exit(bfin_ac97_exit);
420 MODULE_AUTHOR("Roy Huang");
421 MODULE_DESCRIPTION("AC97 driver for ADI Blackfin");
422 MODULE_LICENSE("GPL");