2 * TXx9 ACLC AC97 driver
4 * Copyright (C) 2009 Atsushi Nemoto
6 * Based on RBTX49xx patch from CELF patch archive.
7 * (C) Copyright TOSHIBA CORPORATION 2004-2006
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.
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/delay.h>
17 #include <linux/interrupt.h>
19 #include <linux/gfp.h>
20 #include <sound/core.h>
21 #include <sound/pcm.h>
22 #include <sound/soc.h>
26 (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
29 SNDRV_PCM_RATE_8000_48000
32 #define AC97_FMTS SNDRV_PCM_FMTBIT_S16_BE
34 #define AC97_FMTS SNDRV_PCM_FMTBIT_S16_LE
37 static DECLARE_WAIT_QUEUE_HEAD(ac97_waitq);
39 /* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */
40 static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;
42 static int txx9aclc_regready(struct txx9aclc_plat_drvdata *drvdata)
44 return __raw_readl(drvdata->base + ACINTSTS) & ACINT_REGACCRDY;
47 /* AC97 controller reads codec register */
48 static unsigned short txx9aclc_ac97_read(struct snd_ac97 *ac97,
51 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
52 void __iomem *base = drvdata->base;
55 if (!(__raw_readl(base + ACINTSTS) & ACINT_CODECRDY(ac97->num)))
57 reg |= ac97->num << 7;
58 dat = (reg << ACREGACC_REG_SHIFT) | ACREGACC_READ;
59 __raw_writel(dat, base + ACREGACC);
60 __raw_writel(ACINT_REGACCRDY, base + ACINTEN);
61 if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(txx9aclc_drvdata), HZ)) {
62 __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
63 printk(KERN_ERR "ac97 read timeout (reg %#x)\n", reg);
67 dat = __raw_readl(base + ACREGACC);
68 if (((dat >> ACREGACC_REG_SHIFT) & 0xff) != reg) {
69 printk(KERN_ERR "reg mismatch %x with %x\n",
74 dat = (dat >> ACREGACC_DAT_SHIFT) & 0xffff;
76 __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
80 /* AC97 controller writes to codec register */
81 static void txx9aclc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
84 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
85 void __iomem *base = drvdata->base;
87 __raw_writel(((reg | (ac97->num << 7)) << ACREGACC_REG_SHIFT) |
88 (val << ACREGACC_DAT_SHIFT),
90 __raw_writel(ACINT_REGACCRDY, base + ACINTEN);
91 if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(txx9aclc_drvdata), HZ)) {
93 "ac97 write timeout (reg %#x)\n", reg);
95 __raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
98 static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97)
100 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
101 void __iomem *base = drvdata->base;
102 u32 ready = ACINT_CODECRDY(ac97->num) | ACINT_REGACCRDY;
104 __raw_writel(ACCTL_ENLINK, base + ACCTLDIS);
106 __raw_writel(ACCTL_ENLINK, base + ACCTLEN);
107 /* wait for primary codec ready status */
108 __raw_writel(ready, base + ACINTEN);
109 if (!wait_event_timeout(ac97_waitq,
110 (__raw_readl(base + ACINTSTS) & ready) == ready,
112 dev_err(&ac97->dev, "primary codec is not ready "
114 __raw_readl(base + ACINTSTS));
116 __raw_writel(ACINT_REGACCRDY, base + ACINTSTS);
117 __raw_writel(ready, base + ACINTDIS);
120 /* AC97 controller operations */
121 static struct snd_ac97_bus_ops txx9aclc_ac97_ops = {
122 .read = txx9aclc_ac97_read,
123 .write = txx9aclc_ac97_write,
124 .reset = txx9aclc_ac97_cold_reset,
127 static irqreturn_t txx9aclc_ac97_irq(int irq, void *dev_id)
129 struct txx9aclc_plat_drvdata *drvdata = dev_id;
130 void __iomem *base = drvdata->base;
132 __raw_writel(__raw_readl(base + ACINTMSTS), base + ACINTDIS);
133 wake_up(&ac97_waitq);
137 static int txx9aclc_ac97_probe(struct snd_soc_dai *dai)
139 txx9aclc_drvdata = snd_soc_dai_get_drvdata(dai);
143 static int txx9aclc_ac97_remove(struct snd_soc_dai *dai)
145 struct txx9aclc_plat_drvdata *drvdata = snd_soc_dai_get_drvdata(dai);
147 /* disable AC-link */
148 __raw_writel(ACCTL_ENLINK, drvdata->base + ACCTLDIS);
149 txx9aclc_drvdata = NULL;
153 static struct snd_soc_dai_driver txx9aclc_ac97_dai = {
155 .probe = txx9aclc_ac97_probe,
156 .remove = txx9aclc_ac97_remove,
159 .formats = AC97_FMTS,
165 .formats = AC97_FMTS,
171 static const struct snd_soc_component_driver txx9aclc_ac97_component = {
172 .name = "txx9aclc-ac97",
175 static int txx9aclc_ac97_dev_probe(struct platform_device *pdev)
177 struct txx9aclc_plat_drvdata *drvdata;
182 irq = platform_get_irq(pdev, 0);
186 drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
190 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
191 drvdata->base = devm_ioremap_resource(&pdev->dev, r);
192 if (IS_ERR(drvdata->base))
193 return PTR_ERR(drvdata->base);
195 platform_set_drvdata(pdev, drvdata);
196 drvdata->physbase = r->start;
197 if (sizeof(drvdata->physbase) > sizeof(r->start) &&
198 r->start >= TXX9_DIRECTMAP_BASE &&
199 r->start < TXX9_DIRECTMAP_BASE + 0x400000)
200 drvdata->physbase |= 0xf00000000ull;
201 err = devm_request_irq(&pdev->dev, irq, txx9aclc_ac97_irq,
202 0, dev_name(&pdev->dev), drvdata);
206 err = snd_soc_set_ac97_ops(&txx9aclc_ac97_ops);
210 return devm_snd_soc_register_component(&pdev->dev, &txx9aclc_ac97_component,
211 &txx9aclc_ac97_dai, 1);
214 static int txx9aclc_ac97_dev_remove(struct platform_device *pdev)
216 snd_soc_set_ac97_ops(NULL);
220 static struct platform_driver txx9aclc_ac97_driver = {
221 .probe = txx9aclc_ac97_dev_probe,
222 .remove = txx9aclc_ac97_dev_remove,
224 .name = "txx9aclc-ac97",
228 module_platform_driver(txx9aclc_ac97_driver);
230 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
231 MODULE_DESCRIPTION("TXx9 ACLC AC97 driver");
232 MODULE_LICENSE("GPL");
233 MODULE_ALIAS("platform:txx9aclc-ac97");