Basic PWM driver for AVR32 and AT91

PWM device setup, and a simple PWM driver exposing a programming interface
giving access to each channel's full capabilities.  Note that this doesn't
support starting several channels in synch.

[hskinnemoen@atmel.com: allocate platform device dynamically]
[hskinnemoen@atmel.com: Kconfig fix]
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Andrew Victor <linux@maxim.org.za>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/arch/avr32/mach-at32ap/at32ap700x.c b/arch/avr32/mach-at32ap/at32ap700x.c
index 14e61f05e1f6..7678fee9a885 100644
--- a/arch/avr32/mach-at32ap/at32ap700x.c
+++ b/arch/avr32/mach-at32ap/at32ap700x.c
@@ -1186,6 +1186,59 @@ err_dup_modedb:
 #endif
 
 /* --------------------------------------------------------------------
+ *  PWM
+ * -------------------------------------------------------------------- */
+static struct resource atmel_pwm0_resource[] __initdata = {
+        PBMEM(0xfff01400),
+        IRQ(24),
+};
+static struct clk atmel_pwm0_mck = {
+        .name           = "mck",
+        .parent         = &pbb_clk,
+        .mode           = pbb_clk_mode,
+        .get_rate       = pbb_clk_get_rate,
+        .index          = 5,
+};
+
+struct platform_device *__init at32_add_device_pwm(u32 mask)
+{
+        struct platform_device *pdev;
+
+        if (!mask)
+                return NULL;
+
+        pdev = platform_device_alloc("atmel_pwm", 0);
+        if (!pdev)
+                return NULL;
+
+        if (platform_device_add_resources(pdev, atmel_pwm0_resource,
+                                ARRAY_SIZE(atmel_pwm0_resource)))
+                goto out_free_pdev;
+
+        if (platform_device_add_data(pdev, &mask, sizeof(mask)))
+                goto out_free_pdev;
+
+        if (mask & (1 << 0))
+                select_peripheral(PA(28), PERIPH_A, 0);
+        if (mask & (1 << 1))
+                select_peripheral(PA(29), PERIPH_A, 0);
+        if (mask & (1 << 2))
+                select_peripheral(PA(21), PERIPH_B, 0);
+        if (mask & (1 << 3))
+                select_peripheral(PA(22), PERIPH_B, 0);
+
+        atmel_pwm0_mck.dev = &pdev->dev;
+
+        platform_device_add(pdev);
+
+        return pdev;
+
+out_free_pdev:
+        platform_device_put(pdev);
+        return NULL;
+}
+
+/* --------------------------------------------------------------------
  *  SSC
  * -------------------------------------------------------------------- */
 static struct resource ssc0_resource[] = {
@@ -1646,6 +1699,7 @@ struct clk *at32_clock_list[] = {
         &atmel_usart1_usart,
         &atmel_usart2_usart,
         &atmel_usart3_usart,
+        &atmel_pwm0_mck,
 #if defined(CONFIG_CPU_AT32AP7000)
         &macb0_hclk,
         &macb0_pclk,