1 // SPDX-License-Identifier: GPL-2.0
3 // Hitachi Audio Controller (AC97) support for SH7760/SH7780
10 /* BIG FAT FIXME: although the SH7760 has 2 independent AC97 units, only
13  * to edit the code a bit to use the other AC97 unit.		--mlau
40 #define CR_CR		(1 << 15)	/* "codec-ready" indicator */
44 #define CR_ST		(1 << 5)	/* AC97 link start bit */
46 #define CSAR_RD		(1 << 19)	/* AC97 data read bit */
69 /* manual-suggested AC97 codec access timeouts (us) */
94 #define HACREG(reg)	(*(unsigned long *)(hac->mmio + (reg)))
97  * AC97 read/write flow as outlined in the SH7760 manual (pages 903-906)
105 	for (i = AC97_READ_RETRY; i; i--) {  in hac_get_codec_data()
110 		     --to1)  in hac_get_codec_data()
114 		     --to2)  in hac_get_codec_data()
141 	for (i = AC97_READ_RETRY; i; i--) {  in hac_read_codec_aux()
150 		     --to)  in hac_read_codec_aux()
162 static void hac_ac97_write(struct snd_ac97 *ac97, unsigned short reg,  in hac_ac97_write()  argument
165 	int unit_id = 0 /* ac97->private_data */;  in hac_ac97_write()
169 	for (i = AC97_WRITE_RETRY; i; i--) {  in hac_ac97_write()
177 		/* poll-wait for CMDAMT and CMDDMT */  in hac_ac97_write()
180 		     --to)  in hac_ac97_write()
190 static unsigned short hac_ac97_read(struct snd_ac97 *ac97,  in hac_ac97_read()  argument
193 	int unit_id = 0 /* ac97->private_data */;  in hac_ac97_read()
198 static void hac_ac97_warmrst(struct snd_ac97 *ac97)  in hac_ac97_warmrst()  argument
200 	int unit_id = 0 /* ac97->private_data */;  in hac_ac97_warmrst()
207 	for (tmo = 1000; (tmo > 0) && !(HACREG(HACCR) & CR_CR); tmo--)  in hac_ac97_warmrst()
211 		printk(KERN_INFO "hac: reset: AC97 link down!\n");  in hac_ac97_warmrst()
216 static void hac_ac97_coldrst(struct snd_ac97 *ac97)  in hac_ac97_coldrst()  argument
218 	int unit_id = 0 /* ac97->private_data */;  in hac_ac97_coldrst()
225 	hac_ac97_warmrst(ac97);  in hac_ac97_coldrst()
239 	struct hac_priv *hac = &hac_cpu_data[dai->id];  in hac_hw_params()
240 	int d = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1;  in hac_hw_params()
242 	switch (params->msbits) {  in hac_hw_params()
252 		pr_debug("hac: invalid depth %d bit\n", params->msbits);  in hac_hw_params()
253 		return -EINVAL;  in hac_hw_params()
272 	.name			= "hac-dai.0",
289 	.name			= "hac-dai.1",
310 	.name			= "sh4-hac",
322 	return devm_snd_soc_register_component(&pdev->dev, &sh4_hac_component,  in hac_soc_platform_probe()
333 			.name = "hac-pcm-audio",
343 MODULE_DESCRIPTION("SuperH onchip HAC (AC97) audio driver");