summaryrefslogtreecommitdiff
path: root/arch/arm/mach-ep93xx/core.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-ep93xx/core.c')
-rw-r--r--arch/arm/mach-ep93xx/core.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index 9092677f63eb..b4ee5409eb72 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -714,6 +714,73 @@ void ep93xx_keypad_release_gpio(struct platform_device *pdev)
}
EXPORT_SYMBOL(ep93xx_keypad_release_gpio);
+/*************************************************************************
+ * EP93xx I2S audio peripheral handling
+ *************************************************************************/
+static struct resource ep93xx_i2s_resource[] = {
+ {
+ .start = EP93XX_I2S_PHYS_BASE,
+ .end = EP93XX_I2S_PHYS_BASE + 0x100 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct platform_device ep93xx_i2s_device = {
+ .name = "ep93xx-i2s",
+ .id = -1,
+ .num_resources = ARRAY_SIZE(ep93xx_i2s_resource),
+ .resource = ep93xx_i2s_resource,
+};
+
+void __init ep93xx_register_i2s(void)
+{
+ platform_device_register(&ep93xx_i2s_device);
+}
+
+#define EP93XX_SYSCON_DEVCFG_I2S_MASK (EP93XX_SYSCON_DEVCFG_I2SONSSP | \
+ EP93XX_SYSCON_DEVCFG_I2SONAC97)
+
+#define EP93XX_I2SCLKDIV_MASK (EP93XX_SYSCON_I2SCLKDIV_ORIDE | \
+ EP93XX_SYSCON_I2SCLKDIV_SPOL)
+
+int ep93xx_i2s_acquire(unsigned i2s_pins, unsigned i2s_config)
+{
+ unsigned val;
+
+ /* Sanity check */
+ if (i2s_pins & ~EP93XX_SYSCON_DEVCFG_I2S_MASK)
+ return -EINVAL;
+ if (i2s_config & ~EP93XX_I2SCLKDIV_MASK)
+ return -EINVAL;
+
+ /* Must have only one of I2SONSSP/I2SONAC97 set */
+ if ((i2s_pins & EP93XX_SYSCON_DEVCFG_I2SONSSP) ==
+ (i2s_pins & EP93XX_SYSCON_DEVCFG_I2SONAC97))
+ return -EINVAL;
+
+ ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);
+ ep93xx_devcfg_set_bits(i2s_pins);
+
+ /*
+ * This is potentially racy with the clock api for i2s_mclk, sclk and
+ * lrclk. Since the i2s driver is the only user of those clocks we
+ * rely on it to prevent parallel use of this function and the
+ * clock api for the i2s clocks.
+ */
+ val = __raw_readl(EP93XX_SYSCON_I2SCLKDIV);
+ val &= ~EP93XX_I2SCLKDIV_MASK;
+ val |= i2s_config;
+ ep93xx_syscon_swlocked_write(val, EP93XX_SYSCON_I2SCLKDIV);
+
+ return 0;
+}
+EXPORT_SYMBOL(ep93xx_i2s_acquire);
+
+void ep93xx_i2s_release(void)
+{
+ ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);
+}
+EXPORT_SYMBOL(ep93xx_i2s_release);
extern void ep93xx_gpio_init(void);