1 // SPDX-License-Identifier: GPL-2.0-only
3  * Based on sound/arm/pxa2xx-ac97.c and sound/soc/pxa/pxa2xx-ac97.c
22 #include <sound/pxa2xx-lib.h>
24 #include <linux/platform_data/asoc-pxa.h>
26 #include "pxa2xx-ac97-regs.h"
39  *   o Slot 12 read from modem space will hang controller.
48 	int val = -ENODEV;  in pxa2xx_ac97_read()
52 		return -ENODEV;  in pxa2xx_ac97_read()
65 	/* start read access across the ac97 link */  in pxa2xx_ac97_read()
75 		val = -ETIMEDOUT;  in pxa2xx_ac97_read()
114 		ret = -EIO;  in pxa2xx_ac97_write()
146 	/* warm reset broken on Bulverde, so manually keep AC97 reset high */  in pxa_ac97_warm_pxa27x()
220 	while (!((readl(ac97_reg_base + GSR) | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)  in pxa2xx_ac97_try_warm_reset()
257 	while (!((readl(ac97_reg_base + GSR) | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)  in pxa2xx_ac97_try_cold_reset()
328 	pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;  in pxa2xx_ac97_hw_probe()
332 		dev_err(&dev->dev, "Missing MMIO resource\n");  in pxa2xx_ac97_hw_probe()
337 		switch (pdata->reset_gpio) {  in pxa2xx_ac97_hw_probe()
340 			reset_gpio = pdata->reset_gpio;  in pxa2xx_ac97_hw_probe()
345 		case -1:  in pxa2xx_ac97_hw_probe()
348 			dev_err(&dev->dev, "Invalid reset GPIO %d\n",  in pxa2xx_ac97_hw_probe()
349 				pdata->reset_gpio);  in pxa2xx_ac97_hw_probe()
351 	} else if (!pdata && dev->dev.of_node) {  in pxa2xx_ac97_hw_probe()
352 		pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL);  in pxa2xx_ac97_hw_probe()
354 			return -ENOMEM;  in pxa2xx_ac97_hw_probe()
355 		pdata->reset_gpio = of_get_named_gpio(dev->dev.of_node,  in pxa2xx_ac97_hw_probe()
356 						      "reset-gpios", 0);  in pxa2xx_ac97_hw_probe()
357 		if (pdata->reset_gpio == -ENOENT)  in pxa2xx_ac97_hw_probe()
358 			pdata->reset_gpio = -1;  in pxa2xx_ac97_hw_probe()
359 		else if (pdata->reset_gpio < 0)  in pxa2xx_ac97_hw_probe()
360 			return pdata->reset_gpio;  in pxa2xx_ac97_hw_probe()
361 		reset_gpio = pdata->reset_gpio;  in pxa2xx_ac97_hw_probe()
369 		 * This gpio is needed for a work-around to a bug in the ac97  in pxa2xx_ac97_hw_probe()
370 		 * controller during warm reset.  The direction and level is set  in pxa2xx_ac97_hw_probe()
375 				       "pxa27x ac97 reset");  in pxa2xx_ac97_hw_probe()
383 		ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK");  in pxa2xx_ac97_hw_probe()
391 	ac97_clk = clk_get(&dev->dev, "AC97CLK");  in pxa2xx_ac97_hw_probe()
408 	ret = request_irq(irq, pxa2xx_ac97_irq, 0, "AC97", NULL);  in pxa2xx_ac97_hw_probe()