1 files changed, 325 insertions, 0 deletions

diff --git a/sound/arm/pxa2xx-ac97-lib.c b/sound/arm/pxa2xx-ac97-lib.c
new file mode 100644
index 000000000000..95f8ead44f2a
--- /dev/null
+++ b/sound/arm/pxa2xx-ac97-lib.c
@@ -0,0 +1,325 @@
+/*
+ * Based on sound/arm/pxa2xx-ac97.c and sound/soc/pxa/pxa2xx-ac97.c
+ * which contain:
+ *
+ * Author:      Nicolas Pitre
+ * Created:     Dec 02, 2004
+ * Copyright:   MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+
+#include <sound/ac97_codec.h>
+#include <sound/pxa2xx-lib.h>
+
+#include <asm/irq.h>
+#include <mach/hardware.h>
+#include <mach/pxa-regs.h>
+#include <mach/pxa2xx-gpio.h>
+#include <mach/audio.h>
+
+static DEFINE_MUTEX(car_mutex);
+static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
+static volatile long gsr_bits;
+static struct clk *ac97_clk;
+#ifdef CONFIG_PXA27x
+static struct clk *ac97conf_clk;
+#endif
+
+/*
+ * Beware PXA27x bugs:
+ *
+ *   o Slot 12 read from modem space will hang controller.
+ *   o CDONE, SDONE interrupt fails after any slot 12 IO.
+ *
+ * We therefore have an hybrid approach for waiting on SDONE (interrupt or
+ * 1 jiffy timeout if interrupt never comes).
+ */
+
+unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
+{
+        unsigned short val = -1;
+        volatile u32 *reg_addr;
+
+        mutex_lock(&car_mutex);
+
+        /* set up primary or secondary codec space */
+#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
+        reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
+#else
+        if (reg == AC97_GPIO_STATUS)
+                reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
+        else
+                reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
+#endif
+        reg_addr += (reg >> 1);
+
+        /* start read access across the ac97 link */
+        GSR = GSR_CDONE | GSR_SDONE;
+        gsr_bits = 0;
+        val = *reg_addr;
+        if (reg == AC97_GPIO_STATUS)
+                goto out;
+        if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1) <= 0 &&
+            !((GSR | gsr_bits) & GSR_SDONE)) {
+                printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n",
+                                __func__, reg, GSR | gsr_bits);
+                val = -1;
+                goto out;
+        }
+
+        /* valid data now */
+        GSR = GSR_CDONE | GSR_SDONE;
+        gsr_bits = 0;
+        val = *reg_addr;
+        /* but we've just started another cycle... */
+        wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
+
+out:    mutex_unlock(&car_mutex);
+        return val;
+}
+EXPORT_SYMBOL_GPL(pxa2xx_ac97_read);
+
+void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+                        unsigned short val)
+{
+        volatile u32 *reg_addr;
+
+        mutex_lock(&car_mutex);
+
+        /* set up primary or secondary codec space */
+#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
+        reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
+#else
+        if (reg == AC97_GPIO_STATUS)
+                reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
+        else
+                reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
+#endif
+        reg_addr += (reg >> 1);
+
+        GSR = GSR_CDONE | GSR_SDONE;
+        gsr_bits = 0;
+        *reg_addr = val;
+        if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1) <= 0 &&
+            !((GSR | gsr_bits) & GSR_CDONE))
+                printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n",
+                                __func__, reg, GSR | gsr_bits);
+
+        mutex_unlock(&car_mutex);
+}
+EXPORT_SYMBOL_GPL(pxa2xx_ac97_write);
+
+bool pxa2xx_ac97_try_warm_reset(struct snd_ac97 *ac97)
+{
+#ifdef CONFIG_PXA3xx
+        int timeout = 100;
+#endif
+        gsr_bits = 0;
+
+#ifdef CONFIG_PXA27x
+        /* warm reset broken on Bulverde,
+           so manually keep AC97 reset high */
+        pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
+        udelay(10);
+        GCR |= GCR_WARM_RST;
+        pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
+        udelay(500);
+#elif defined(CONFIG_PXA3xx)
+        /* Can't use interrupts */
+        GCR |= GCR_WARM_RST;
+        while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
+                mdelay(1);
+#else
+        GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN;
+        wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
+#endif
+
+        if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
+                printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
+                                 __func__, gsr_bits);
+
+                return false;
+        }
+
+        return true;
+}
+EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_warm_reset);
+
+bool pxa2xx_ac97_try_cold_reset(struct snd_ac97 *ac97)
+{
+#ifdef CONFIG_PXA3xx
+        int timeout = 1000;
+
+        /* Hold CLKBPB for 100us */
+        GCR = 0;
+        GCR = GCR_CLKBPB;
+        udelay(100);
+        GCR = 0;
+#endif
+
+        GCR &=  GCR_COLD_RST;  /* clear everything but nCRST */
+        GCR &= ~GCR_COLD_RST;  /* then assert nCRST */
+
+        gsr_bits = 0;
+#ifdef CONFIG_PXA27x
+        /* PXA27x Developers Manual section 13.5.2.2.1 */
+        clk_enable(ac97conf_clk);
+        udelay(5);
+        clk_disable(ac97conf_clk);
+        GCR = GCR_COLD_RST;
+        udelay(50);
+#elif defined(CONFIG_PXA3xx)
+        /* Can't use interrupts on PXA3xx */
+        GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
+
+        GCR = GCR_WARM_RST | GCR_COLD_RST;
+        while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--)
+                mdelay(10);
+#else
+        GCR = GCR_COLD_RST;
+        GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
+        wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
+#endif
+
+        if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
+                printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
+                                 __func__, gsr_bits);
+
+                return false;
+        }
+
+        return true;
+}
+EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_cold_reset);
+
+
+void pxa2xx_ac97_finish_reset(struct snd_ac97 *ac97)
+{
+        GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
+        GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
+}
+EXPORT_SYMBOL_GPL(pxa2xx_ac97_finish_reset);
+
+static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
+{
+        long status;
+
+        status = GSR;
+        if (status) {
+                GSR = status;
+                gsr_bits |= status;
+                wake_up(&gsr_wq);
+
+#ifdef CONFIG_PXA27x
+                /* Although we don't use those we still need to clear them
+                   since they tend to spuriously trigger when MMC is used
+                   (hardware bug? go figure)... */
+                MISR = MISR_EOC;
+                PISR = PISR_EOC;
+                MCSR = MCSR_EOC;
+#endif
+
+                return IRQ_HANDLED;
+        }
+
+        return IRQ_NONE;
+}
+
+#ifdef CONFIG_PM
+int pxa2xx_ac97_hw_suspend(void)
+{
+        GCR |= GCR_ACLINK_OFF;
+        clk_disable(ac97_clk);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_suspend);
+
+int pxa2xx_ac97_hw_resume(void)
+{
+        pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
+        pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
+        pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
+        pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
+#ifdef CONFIG_PXA27x
+        /* Use GPIO 113 as AC97 Reset on Bulverde */
+        pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
+#endif
+        clk_enable(ac97_clk);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_resume);
+#endif
+
+int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev)
+{
+        int ret;
+
+        ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "AC97", NULL);
+        if (ret < 0)
+                goto err;
+
+        pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
+        pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
+        pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
+        pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
+#ifdef CONFIG_PXA27x
+        /* Use GPIO 113 as AC97 Reset on Bulverde */
+        pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
+        ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK");
+        if (IS_ERR(ac97conf_clk)) {
+                ret = PTR_ERR(ac97conf_clk);
+                ac97conf_clk = NULL;
+                goto err_irq;
+        }
+#endif
+
+        ac97_clk = clk_get(&dev->dev, "AC97CLK");
+        if (IS_ERR(ac97_clk)) {
+                ret = PTR_ERR(ac97_clk);
+                ac97_clk = NULL;
+                goto err_irq;
+        }
+
+        return clk_enable(ac97_clk);
+
+err_irq:
+        GCR |= GCR_ACLINK_OFF;
+#ifdef CONFIG_PXA27x
+        if (ac97conf_clk) {
+                clk_put(ac97conf_clk);
+                ac97conf_clk = NULL;
+        }
+#endif
+        free_irq(IRQ_AC97, NULL);
+err:
+        return ret;
+}
+EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_probe);
+
+void pxa2xx_ac97_hw_remove(struct platform_device *dev)
+{
+        GCR |= GCR_ACLINK_OFF;
+        free_irq(IRQ_AC97, NULL);
+#ifdef CONFIG_PXA27x
+        clk_put(ac97conf_clk);
+        ac97conf_clk = NULL;
+#endif
+        clk_disable(ac97_clk);
+        clk_put(ac97_clk);
+        ac97_clk = NULL;
+}
+EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_remove);
+
+MODULE_AUTHOR("Nicolas Pitre");
+MODULE_DESCRIPTION("Intel/Marvell PXA sound library");
+MODULE_LICENSE("GPL");
+