1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TXx9 ACLC AC97 driver
4 *
5 * Copyright (C) 2009 Atsushi Nemoto
6 *
7 * Based on RBTX49xx patch from CELF patch archive.
8 * (C) Copyright TOSHIBA CORPORATION 2004-2006
9 */
10
11#include <linux/init.h>
12#include <linux/module.h>
13#include <linux/delay.h>
14#include <linux/interrupt.h>
15#include <linux/io.h>
16#include <linux/gfp.h>
17#include <asm/mach-tx39xx/ioremap.h> /* for TXX9_DIRECTMAP_BASE */
18#include <sound/core.h>
19#include <sound/pcm.h>
20#include <sound/soc.h>
21#include "txx9aclc.h"
22
23#define AC97_DIR	\
24	(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
25
26#define AC97_RATES	\
27	SNDRV_PCM_RATE_8000_48000
28
29#ifdef __BIG_ENDIAN
30#define AC97_FMTS	SNDRV_PCM_FMTBIT_S16_BE
31#else
32#define AC97_FMTS	SNDRV_PCM_FMTBIT_S16_LE
33#endif
34
35static DECLARE_WAIT_QUEUE_HEAD(ac97_waitq);
36
37/* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */
38static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;
39
40static int txx9aclc_regready(struct txx9aclc_plat_drvdata *drvdata)
41{
42	return __raw_readl(drvdata->base + ACINTSTS) & ACINT_REGACCRDY;
43}
44
45/* AC97 controller reads codec register */
46static unsigned short txx9aclc_ac97_read(struct snd_ac97 *ac97,
47					 unsigned short reg)
48{
49	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
50	void __iomem *base = drvdata->base;
51	u32 dat;
52
53	if (!(__raw_readl(base + ACINTSTS) & ACINT_CODECRDY(ac97->num)))
54		return 0xffff;
55	reg |= ac97->num << 7;
56	dat = (reg << ACREGACC_REG_SHIFT) | ACREGACC_READ;
57	__raw_writel(dat, base + ACREGACC);
58	__raw_writel(ACINT_REGACCRDY, base + ACINTEN);
59	if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(txx9aclc_drvdata), HZ)) {
60		__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
61		printk(KERN_ERR "ac97 read timeout (reg %#x)\n", reg);
62		dat = 0xffff;
63		goto done;
64	}
65	dat = __raw_readl(base + ACREGACC);
66	if (((dat >> ACREGACC_REG_SHIFT) & 0xff) != reg) {
67		printk(KERN_ERR "reg mismatch %x with %x\n",
68			dat, reg);
69		dat = 0xffff;
70		goto done;
71	}
72	dat = (dat >> ACREGACC_DAT_SHIFT) & 0xffff;
73done:
74	__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
75	return dat;
76}
77
78/* AC97 controller writes to codec register */
79static void txx9aclc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
80				unsigned short val)
81{
82	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
83	void __iomem *base = drvdata->base;
84
85	__raw_writel(((reg | (ac97->num << 7)) << ACREGACC_REG_SHIFT) |
86		     (val << ACREGACC_DAT_SHIFT),
87		     base + ACREGACC);
88	__raw_writel(ACINT_REGACCRDY, base + ACINTEN);
89	if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(txx9aclc_drvdata), HZ)) {
90		printk(KERN_ERR
91			"ac97 write timeout (reg %#x)\n", reg);
92	}
93	__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
94}
95
96static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97)
97{
98	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
99	void __iomem *base = drvdata->base;
100	u32 ready = ACINT_CODECRDY(ac97->num) | ACINT_REGACCRDY;
101
102	__raw_writel(ACCTL_ENLINK, base + ACCTLDIS);
103	udelay(1);
104	__raw_writel(ACCTL_ENLINK, base + ACCTLEN);
105	/* wait for primary codec ready status */
106	__raw_writel(ready, base + ACINTEN);
107	if (!wait_event_timeout(ac97_waitq,
108				(__raw_readl(base + ACINTSTS) & ready) == ready,
109				HZ)) {
110		dev_err(&ac97->dev, "primary codec is not ready "
111			"(status %#x)\n",
112			__raw_readl(base + ACINTSTS));
113	}
114	__raw_writel(ACINT_REGACCRDY, base + ACINTSTS);
115	__raw_writel(ready, base + ACINTDIS);
116}
117
118/* AC97 controller operations */
119static struct snd_ac97_bus_ops txx9aclc_ac97_ops = {
120	.read		= txx9aclc_ac97_read,
121	.write		= txx9aclc_ac97_write,
122	.reset		= txx9aclc_ac97_cold_reset,
123};
124
125static irqreturn_t txx9aclc_ac97_irq(int irq, void *dev_id)
126{
127	struct txx9aclc_plat_drvdata *drvdata = dev_id;
128	void __iomem *base = drvdata->base;
129
130	__raw_writel(__raw_readl(base + ACINTMSTS), base + ACINTDIS);
131	wake_up(&ac97_waitq);
132	return IRQ_HANDLED;
133}
134
135static int txx9aclc_ac97_probe(struct snd_soc_dai *dai)
136{
137	txx9aclc_drvdata = snd_soc_dai_get_drvdata(dai);
138	return 0;
139}
140
141static int txx9aclc_ac97_remove(struct snd_soc_dai *dai)
142{
143	struct txx9aclc_plat_drvdata *drvdata = snd_soc_dai_get_drvdata(dai);
144
145	/* disable AC-link */
146	__raw_writel(ACCTL_ENLINK, drvdata->base + ACCTLDIS);
147	txx9aclc_drvdata = NULL;
148	return 0;
149}
150
151static struct snd_soc_dai_driver txx9aclc_ac97_dai = {
152	.probe			= txx9aclc_ac97_probe,
153	.remove			= txx9aclc_ac97_remove,
154	.playback = {
155		.rates		= AC97_RATES,
156		.formats	= AC97_FMTS,
157		.channels_min	= 2,
158		.channels_max	= 2,
159	},
160	.capture = {
161		.rates		= AC97_RATES,
162		.formats	= AC97_FMTS,
163		.channels_min	= 2,
164		.channels_max	= 2,
165	},
166};
167
168static const struct snd_soc_component_driver txx9aclc_ac97_component = {
169	.name		= "txx9aclc-ac97",
170};
171
172static int txx9aclc_ac97_dev_probe(struct platform_device *pdev)
173{
174	struct txx9aclc_plat_drvdata *drvdata;
175	struct resource *r;
176	int err;
177	int irq;
178
179	irq = platform_get_irq(pdev, 0);
180	if (irq < 0)
181		return irq;
182
183	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
184	if (!drvdata)
185		return -ENOMEM;
186
187	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
188	drvdata->base = devm_ioremap_resource(&pdev->dev, r);
189	if (IS_ERR(drvdata->base))
190		return PTR_ERR(drvdata->base);
191
192	platform_set_drvdata(pdev, drvdata);
193	drvdata->physbase = r->start;
194	if (sizeof(drvdata->physbase) > sizeof(r->start) &&
195	    r->start >= TXX9_DIRECTMAP_BASE &&
196	    r->start < TXX9_DIRECTMAP_BASE + 0x400000)
197		drvdata->physbase |= 0xf00000000ull;
198	err = devm_request_irq(&pdev->dev, irq, txx9aclc_ac97_irq,
199			       0, dev_name(&pdev->dev), drvdata);
200	if (err < 0)
201		return err;
202
203	err = snd_soc_set_ac97_ops(&txx9aclc_ac97_ops);
204	if (err < 0)
205		return err;
206
207	return devm_snd_soc_register_component(&pdev->dev, &txx9aclc_ac97_component,
208					  &txx9aclc_ac97_dai, 1);
209}
210
211static int txx9aclc_ac97_dev_remove(struct platform_device *pdev)
212{
213	snd_soc_set_ac97_ops(NULL);
214	return 0;
215}
216
217static struct platform_driver txx9aclc_ac97_driver = {
218	.probe		= txx9aclc_ac97_dev_probe,
219	.remove		= txx9aclc_ac97_dev_remove,
220	.driver		= {
221		.name	= "txx9aclc-ac97",
222	},
223};
224
225module_platform_driver(txx9aclc_ac97_driver);
226
227MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
228MODULE_DESCRIPTION("TXx9 ACLC AC97 driver");
229MODULE_LICENSE("GPL");
230MODULE_ALIAS("platform:txx9aclc-ac97");
231