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>

1 files changed, 66 insertions, 1 deletions

diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-ep93xx/clock.c
index 5f80092b6ace..e782af18ffb7 100644
--- a/arch/arm/mach-ep93xx/clock.c
+++ b/arch/arm/mach-ep93xx/clock.c
@@ -43,7 +43,8 @@ static unsigned long get_uart_rate(struct clk *clk);
 
 static int set_keytchclk_rate(struct clk *clk, unsigned long rate);
 static int set_div_rate(struct clk *clk, unsigned long rate);
-
+static int set_i2s_sclk_rate(struct clk *clk, unsigned long rate);
+static int set_i2s_lrclk_rate(struct clk *clk, unsigned long rate);
 
 static struct clk clk_xtali = {
         .rate           = EP93XX_EXT_CLK_RATE,
@@ -108,6 +109,29 @@ static struct clk clk_video = {
         .set_rate       = set_div_rate,
 };
 
+static struct clk clk_i2s_mclk = {
+        .sw_locked      = 1,
+        .enable_reg     = EP93XX_SYSCON_I2SCLKDIV,
+        .enable_mask    = EP93XX_SYSCON_CLKDIV_ENABLE,
+        .set_rate       = set_div_rate,
+};
+
+static struct clk clk_i2s_sclk = {
+        .sw_locked      = 1,
+        .parent         = &clk_i2s_mclk,
+        .enable_reg     = EP93XX_SYSCON_I2SCLKDIV,
+        .enable_mask    = EP93XX_SYSCON_I2SCLKDIV_SENA,
+        .set_rate       = set_i2s_sclk_rate,
+};
+
+static struct clk clk_i2s_lrclk = {
+        .sw_locked      = 1,
+        .parent         = &clk_i2s_sclk,
+        .enable_reg     = EP93XX_SYSCON_I2SCLKDIV,
+        .enable_mask    = EP93XX_SYSCON_I2SCLKDIV_SENA,
+        .set_rate       = set_i2s_lrclk_rate,
+};
+
 /* DMA Clocks */
 static struct clk clk_m2p0 = {
         .parent         = &clk_h,
@@ -186,6 +210,9 @@ static struct clk_lookup clocks[] = {
         INIT_CK("ep93xx-ohci",          NULL,           &clk_usb_host),
         INIT_CK("ep93xx-keypad",        NULL,           &clk_keypad),
         INIT_CK("ep93xx-fb",            NULL,           &clk_video),
+        INIT_CK("ep93xx-i2s",           "mclk",         &clk_i2s_mclk),
+        INIT_CK("ep93xx-i2s",           "sclk",         &clk_i2s_sclk),
+        INIT_CK("ep93xx-i2s",           "lrclk",        &clk_i2s_lrclk),
         INIT_CK(NULL,                   "pwm_clk",      &clk_pwm),
         INIT_CK(NULL,                   "m2p0",         &clk_m2p0),
         INIT_CK(NULL,                   "m2p1",         &clk_m2p1),
@@ -396,6 +423,44 @@ static int set_div_rate(struct clk *clk, unsigned long rate)
         return 0;
 }
 
+static int set_i2s_sclk_rate(struct clk *clk, unsigned long rate)
+{
+        unsigned val = __raw_readl(clk->enable_reg);
+
+        if (rate == clk_i2s_mclk.rate / 2)
+                ep93xx_syscon_swlocked_write(val & ~EP93XX_I2SCLKDIV_SDIV, 
+                                             clk->enable_reg);
+        else if (rate == clk_i2s_mclk.rate / 4)
+                ep93xx_syscon_swlocked_write(val | EP93XX_I2SCLKDIV_SDIV, 
+                                             clk->enable_reg);
+        else
+                return -EINVAL;
+
+        clk_i2s_sclk.rate = rate;
+        return 0;
+}
+
+static int set_i2s_lrclk_rate(struct clk *clk, unsigned long rate)
+{
+        unsigned val = __raw_readl(clk->enable_reg) & 
+                ~EP93XX_I2SCLKDIV_LRDIV_MASK;
+        
+        if (rate == clk_i2s_sclk.rate / 32)
+                ep93xx_syscon_swlocked_write(val | EP93XX_I2SCLKDIV_LRDIV32,
+                                             clk->enable_reg);
+        else if (rate == clk_i2s_sclk.rate / 64)
+                ep93xx_syscon_swlocked_write(val | EP93XX_I2SCLKDIV_LRDIV64,
+                                             clk->enable_reg);
+        else if (rate == clk_i2s_sclk.rate / 128)
+                ep93xx_syscon_swlocked_write(val | EP93XX_I2SCLKDIV_LRDIV128,
+                                             clk->enable_reg);
+        else
+                return -EINVAL;
+
+        clk_i2s_lrclk.rate = rate;
+        return 0;
+}
+
 int clk_set_rate(struct clk *clk, unsigned long rate)
 {
         if (clk->set_rate)