ARM: LPC32xx: ADC support for mach-lpc32xx

This patch adds the mach specific support for the LPC32XX ADC driver (the
latter being already in staging/iio)

Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

4 files changed, 60 insertions, 0 deletions

diff --git a/arch/arm/mach-lpc32xx/clock.c b/arch/arm/mach-lpc32xx/clock.c
index 1e027514096d..473015ac07bd 100644
--- a/arch/arm/mach-lpc32xx/clock.c
+++ b/arch/arm/mach-lpc32xx/clock.c
@@ -719,6 +719,41 @@ static struct clk clk_tsc = {
         .get_rate       = local_return_parent_rate,
 };
 
+static int adc_onoff_enable(struct clk *clk, int enable)
+{
+        u32 tmp;
+        u32 divider;
+
+        /* Use PERIPH_CLOCK */
+        tmp = __raw_readl(LPC32XX_CLKPWR_ADC_CLK_CTRL_1);
+        tmp |= LPC32XX_CLKPWR_ADCCTRL1_PCLK_SEL;
+        /*
+         * Set clock divider so that we have equal to or less than
+         * 4.5MHz clock at ADC
+         */
+        divider = clk->get_rate(clk) / 4500000 + 1;
+        tmp |= divider;
+        __raw_writel(tmp, LPC32XX_CLKPWR_ADC_CLK_CTRL_1);
+
+        /* synchronize rate of this clock w/ actual HW setting */
+        clk->rate = clk->get_rate(clk->parent) / divider;
+
+        if (enable == 0)
+                __raw_writel(0, clk->enable_reg);
+        else
+                __raw_writel(clk->enable_mask, clk->enable_reg);
+
+        return 0;
+}
+
+static struct clk clk_adc = {
+        .parent         = &clk_pclk,
+        .enable         = adc_onoff_enable,
+        .enable_reg     = LPC32XX_CLKPWR_ADC_CLK_CTRL,
+        .enable_mask    = LPC32XX_CLKPWR_ADC32CLKCTRL_CLK_EN,
+        .get_rate       = local_return_parent_rate,
+};
+
 static int mmc_onoff_enable(struct clk *clk, int enable)
 {
         u32 tmp;
@@ -1075,6 +1110,7 @@ static struct clk_lookup lookups[] = {
         _REGISTER_CLOCK("dev:ssp1", NULL, clk_ssp1)
         _REGISTER_CLOCK("lpc32xx_keys.0", NULL, clk_kscan)
         _REGISTER_CLOCK("lpc32xx-nand.0", "nand_ck", clk_nand)
+        _REGISTER_CLOCK("lpc32xx-adc", NULL, clk_adc)
         _REGISTER_CLOCK("tbd", "i2s0_ck", clk_i2s0)
         _REGISTER_CLOCK("tbd", "i2s1_ck", clk_i2s1)
         _REGISTER_CLOCK("ts-lpc32xx", NULL, clk_tsc)
diff --git a/arch/arm/mach-lpc32xx/common.c b/arch/arm/mach-lpc32xx/common.c
index 369b152896cd..6c76bb36559b 100644
--- a/arch/arm/mach-lpc32xx/common.c
+++ b/arch/arm/mach-lpc32xx/common.c
@@ -138,6 +138,28 @@ struct platform_device lpc32xx_rtc_device = {
 };
 
 /*
+ * ADC support
+ */
+static struct resource adc_resources[] = {
+        {
+                .start = LPC32XX_ADC_BASE,
+                .end = LPC32XX_ADC_BASE + SZ_4K - 1,
+                .flags = IORESOURCE_MEM,
+        }, {
+                .start = IRQ_LPC32XX_TS_IRQ,
+                .end = IRQ_LPC32XX_TS_IRQ,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+struct platform_device lpc32xx_adc_device = {
+        .name =  "lpc32xx-adc",
+        .id = -1,
+        .num_resources = ARRAY_SIZE(adc_resources),
+        .resource = adc_resources,
+};
+
+/*
  * Returns the unique ID for the device
  */
 void lpc32xx_get_uid(u32 devid[4])
diff --git a/arch/arm/mach-lpc32xx/common.h b/arch/arm/mach-lpc32xx/common.h
index 4b4e700343c1..04b72739eb9c 100644
--- a/arch/arm/mach-lpc32xx/common.h
+++ b/arch/arm/mach-lpc32xx/common.h
@@ -29,6 +29,7 @@ extern struct platform_device lpc32xx_i2c0_device;
 extern struct platform_device lpc32xx_i2c1_device;
 extern struct platform_device lpc32xx_i2c2_device;
 extern struct platform_device lpc32xx_tsc_device;
+extern struct platform_device lpc32xx_adc_device;
 extern struct platform_device lpc32xx_rtc_device;
 
 /*
diff --git a/arch/arm/mach-lpc32xx/phy3250.c b/arch/arm/mach-lpc32xx/phy3250.c
index bfee5b455105..a2f0d4e3f773 100644
--- a/arch/arm/mach-lpc32xx/phy3250.c
+++ b/arch/arm/mach-lpc32xx/phy3250.c
@@ -276,6 +276,7 @@ static struct platform_device *phy3250_devs[] __initdata = {
         &lpc32xx_i2c2_device,
         &lpc32xx_watchdog_device,
         &lpc32xx_gpio_led_device,
+        &lpc32xx_adc_device,
 };
 
 static struct amba_device *amba_devs[] __initdata = {