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authorRyan Mallon <ryan@bluewatersys.com>2010-06-08 22:01:10 +1200
committerMark Brown <broonie@opensource.wolfsonmicro.com>2010-06-09 11:12:36 +0100
commited67ea82c0d9a163458dc6a69a7a3123db1a8b3b (patch)
tree6789785686ddf249ab813c296ade58b7b0443d33 /arch/arm/mach-ep93xx/core.c
parente40152ee1e1c7a63f4777791863215e3faa37a86 (diff)
EP93xx: Add i2s core support
Add core support for EP93xx i2s audio Signed-off-by: Ryan Mallon <ryan@bluewatersys.com> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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 90fb591cbffa..005af0fba334 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -617,6 +617,73 @@ 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);