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Linux/sound/soc/txx9/txx9aclc-ac97.c

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  1 /*
  2  * TXx9 ACLC AC97 driver
  3  *
  4  * Copyright (C) 2009 Atsushi Nemoto
  5  *
  6  * Based on RBTX49xx patch from CELF patch archive.
  7  * (C) Copyright TOSHIBA CORPORATION 2004-2006
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  */
 13 
 14 #include <linux/init.h>
 15 #include <linux/module.h>
 16 #include <linux/delay.h>
 17 #include <linux/interrupt.h>
 18 #include <linux/io.h>
 19 #include <sound/core.h>
 20 #include <sound/pcm.h>
 21 #include <sound/soc.h>
 22 #include "txx9aclc.h"
 23 
 24 #define AC97_DIR        \
 25         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
 26 
 27 #define AC97_RATES      \
 28         SNDRV_PCM_RATE_8000_48000
 29 
 30 #ifdef __BIG_ENDIAN
 31 #define AC97_FMTS       SNDRV_PCM_FMTBIT_S16_BE
 32 #else
 33 #define AC97_FMTS       SNDRV_PCM_FMTBIT_S16_LE
 34 #endif
 35 
 36 static DECLARE_WAIT_QUEUE_HEAD(ac97_waitq);
 37 
 38 /* REVISIT: How to find txx9aclc_soc_device from snd_ac97? */
 39 static struct txx9aclc_soc_device *txx9aclc_soc_dev;
 40 
 41 static int txx9aclc_regready(struct txx9aclc_soc_device *dev)
 42 {
 43         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
 44 
 45         return __raw_readl(drvdata->base + ACINTSTS) & ACINT_REGACCRDY;
 46 }
 47 
 48 /* AC97 controller reads codec register */
 49 static unsigned short txx9aclc_ac97_read(struct snd_ac97 *ac97,
 50                                          unsigned short reg)
 51 {
 52         struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
 53         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
 54         void __iomem *base = drvdata->base;
 55         u32 dat;
 56 
 57         if (!(__raw_readl(base + ACINTSTS) & ACINT_CODECRDY(ac97->num)))
 58                 return 0xffff;
 59         reg |= ac97->num << 7;
 60         dat = (reg << ACREGACC_REG_SHIFT) | ACREGACC_READ;
 61         __raw_writel(dat, base + ACREGACC);
 62         __raw_writel(ACINT_REGACCRDY, base + ACINTEN);
 63         if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(dev), HZ)) {
 64                 __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
 65                 dev_err(dev->soc_dev.dev, "ac97 read timeout (reg %#x)\n", reg);
 66                 dat = 0xffff;
 67                 goto done;
 68         }
 69         dat = __raw_readl(base + ACREGACC);
 70         if (((dat >> ACREGACC_REG_SHIFT) & 0xff) != reg) {
 71                 dev_err(dev->soc_dev.dev, "reg mismatch %x with %x\n",
 72                         dat, reg);
 73                 dat = 0xffff;
 74                 goto done;
 75         }
 76         dat = (dat >> ACREGACC_DAT_SHIFT) & 0xffff;
 77 done:
 78         __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
 79         return dat;
 80 }
 81 
 82 /* AC97 controller writes to codec register */
 83 static void txx9aclc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 84                                 unsigned short val)
 85 {
 86         struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
 87         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
 88         void __iomem *base = drvdata->base;
 89 
 90         __raw_writel(((reg | (ac97->num << 7)) << ACREGACC_REG_SHIFT) |
 91                      (val << ACREGACC_DAT_SHIFT),
 92                      base + ACREGACC);
 93         __raw_writel(ACINT_REGACCRDY, base + ACINTEN);
 94         if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(dev), HZ)) {
 95                 dev_err(dev->soc_dev.dev,
 96                         "ac97 write timeout (reg %#x)\n", reg);
 97         }
 98         __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
 99 }
100 
101 static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97)
102 {
103         struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
104         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
105         void __iomem *base = drvdata->base;
106         u32 ready = ACINT_CODECRDY(ac97->num) | ACINT_REGACCRDY;
107 
108         __raw_writel(ACCTL_ENLINK, base + ACCTLDIS);
109         mmiowb();
110         udelay(1);
111         __raw_writel(ACCTL_ENLINK, base + ACCTLEN);
112         /* wait for primary codec ready status */
113         __raw_writel(ready, base + ACINTEN);
114         if (!wait_event_timeout(ac97_waitq,
115                                 (__raw_readl(base + ACINTSTS) & ready) == ready,
116                                 HZ)) {
117                 dev_err(&ac97->dev, "primary codec is not ready "
118                         "(status %#x)\n",
119                         __raw_readl(base + ACINTSTS));
120         }
121         __raw_writel(ACINT_REGACCRDY, base + ACINTSTS);
122         __raw_writel(ready, base + ACINTDIS);
123 }
124 
125 /* AC97 controller operations */
126 struct snd_ac97_bus_ops soc_ac97_ops = {
127         .read           = txx9aclc_ac97_read,
128         .write          = txx9aclc_ac97_write,
129         .reset          = txx9aclc_ac97_cold_reset,
130 };
131 EXPORT_SYMBOL_GPL(soc_ac97_ops);
132 
133 static irqreturn_t txx9aclc_ac97_irq(int irq, void *dev_id)
134 {
135         struct txx9aclc_plat_drvdata *drvdata = dev_id;
136         void __iomem *base = drvdata->base;
137 
138         __raw_writel(__raw_readl(base + ACINTMSTS), base + ACINTDIS);
139         wake_up(&ac97_waitq);
140         return IRQ_HANDLED;
141 }
142 
143 static int txx9aclc_ac97_probe(struct platform_device *pdev,
144                                struct snd_soc_dai *dai)
145 {
146         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
147         struct txx9aclc_soc_device *dev =
148                 container_of(socdev, struct txx9aclc_soc_device, soc_dev);
149 
150         dev->aclc_pdev = to_platform_device(dai->dev);
151         txx9aclc_soc_dev = dev;
152         return 0;
153 }
154 
155 static void txx9aclc_ac97_remove(struct platform_device *pdev,
156                                  struct snd_soc_dai *dai)
157 {
158         struct platform_device *aclc_pdev = to_platform_device(dai->dev);
159         struct txx9aclc_plat_drvdata *drvdata = platform_get_drvdata(aclc_pdev);
160 
161         /* disable AC-link */
162         __raw_writel(ACCTL_ENLINK, drvdata->base + ACCTLDIS);
163         txx9aclc_soc_dev = NULL;
164 }
165 
166 struct snd_soc_dai txx9aclc_ac97_dai = {
167         .name                   = "txx9aclc_ac97",
168         .ac97_control           = 1,
169         .probe                  = txx9aclc_ac97_probe,
170         .remove                 = txx9aclc_ac97_remove,
171         .playback = {
172                 .rates          = AC97_RATES,
173                 .formats        = AC97_FMTS,
174                 .channels_min   = 2,
175                 .channels_max   = 2,
176         },
177         .capture = {
178                 .rates          = AC97_RATES,
179                 .formats        = AC97_FMTS,
180                 .channels_min   = 2,
181                 .channels_max   = 2,
182         },
183 };
184 EXPORT_SYMBOL_GPL(txx9aclc_ac97_dai);
185 
186 static int __devinit txx9aclc_ac97_dev_probe(struct platform_device *pdev)
187 {
188         struct txx9aclc_plat_drvdata *drvdata;
189         struct resource *r;
190         int err;
191         int irq;
192 
193         irq = platform_get_irq(pdev, 0);
194         if (irq < 0)
195                 return irq;
196         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
197         if (!r)
198                 return -EBUSY;
199 
200         if (!devm_request_mem_region(&pdev->dev, r->start, resource_size(r),
201                                      dev_name(&pdev->dev)))
202                 return -EBUSY;
203 
204         drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
205         if (!drvdata)
206                 return -ENOMEM;
207         platform_set_drvdata(pdev, drvdata);
208         drvdata->physbase = r->start;
209         if (sizeof(drvdata->physbase) > sizeof(r->start) &&
210             r->start >= TXX9_DIRECTMAP_BASE &&
211             r->start < TXX9_DIRECTMAP_BASE + 0x400000)
212                 drvdata->physbase |= 0xf00000000ull;
213         drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
214         if (!drvdata->base)
215                 return -EBUSY;
216         err = devm_request_irq(&pdev->dev, irq, txx9aclc_ac97_irq,
217                                IRQF_DISABLED, dev_name(&pdev->dev), drvdata);
218         if (err < 0)
219                 return err;
220 
221         txx9aclc_ac97_dai.dev = &pdev->dev;
222         return snd_soc_register_dai(&txx9aclc_ac97_dai);
223 }
224 
225 static int __devexit txx9aclc_ac97_dev_remove(struct platform_device *pdev)
226 {
227         snd_soc_unregister_dai(&txx9aclc_ac97_dai);
228         return 0;
229 }
230 
231 static struct platform_driver txx9aclc_ac97_driver = {
232         .probe          = txx9aclc_ac97_dev_probe,
233         .remove         = __devexit_p(txx9aclc_ac97_dev_remove),
234         .driver         = {
235                 .name   = "txx9aclc-ac97",
236                 .owner  = THIS_MODULE,
237         },
238 };
239 
240 static int __init txx9aclc_ac97_init(void)
241 {
242         return platform_driver_register(&txx9aclc_ac97_driver);
243 }
244 
245 static void __exit txx9aclc_ac97_exit(void)
246 {
247         platform_driver_unregister(&txx9aclc_ac97_driver);
248 }
249 
250 module_init(txx9aclc_ac97_init);
251 module_exit(txx9aclc_ac97_exit);
252 
253 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
254 MODULE_DESCRIPTION("TXx9 ACLC AC97 driver");
255 MODULE_LICENSE("GPL");
256 

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