#include <linux/input.h>
#include <linux/input/matrix_keypad.h>
#include <linux/gpio_keys.h>
+#include <linux/pwm_backlight.h>
static unsigned int vp6500_pins[] = {
-
/* UART1 */
PE12_PF_UART1_TXD,
PE13_PF_UART1_RXD,
PA30_PF_CONTRAST,
PA31_PF_OE_ACD,
#endif
+
+ /* LCD Backlight */
+ PE5_PF_PWMO,
+ VP6500_GPIO_BACKLIGHT_EN | GPIO_GPIO | GPIO_OUT,
};
+/* Flash */
+
static struct physmap_flash_data vp6500_flash_data = {
.width = 2,
};
.resource = &vp6500_flash_resource,
};
+/* LEDs */
+
static struct gpio_led vp6500_leds[] = {
{
.name = "vp6500:orange:keypad",
},
};
+/* Keypad */
+
static const uint32_t vp6500_keypad_keys[] = {
KEY(0, 3, KEY_F2),
KEY(0, 4, KEY_RIGHT),
},
};
+/* LCD backlight */
+
+static int vp6500_backlight_notify(struct device *dev, int brightness)
+{
+ gpio_set_value(VP6500_GPIO_BACKLIGHT_EN, !!brightness);
+
+ return brightness;
+}
+
+static struct platform_pwm_backlight_data vp6500_backlight_data = {
+ .max_brightness = 255,
+ .dft_brightness = 100,
+ .pwm_period_ns = 15000000,
+ .notify = vp6500_backlight_notify,
+};
+
+static struct platform_device vp6500_backlight_device = {
+ .name = "pwm-backlight",
+ .id = -1,
+ .dev = {
+ .parent = &mxc_pwm_device.dev,
+ .platform_data = &vp6500_backlight_data,
+ },
+};
+
+
static struct platform_device *platform_devices[] __initdata = {
&vp6500_nor_mtd_device,
&vp6500_leds_device,
&vp6500_keypad_device,
&vp6500_key_device,
+ &vp6500_backlight_device,
};
static void __init vp6500_board_init(void)
"vp6500");
mxc_register_device(&mxc_uart_device0, NULL);
+ mxc_register_device(&mxc_pwm_device, NULL);
platform_add_devices(platform_devices, ARRAY_SIZE(platform_devices));
}
--- /dev/null
+diff --git a/arch/arm/plat-mxc/pwm.c b/arch/arm/plat-mxc/pwm.c
+index c36f263..acc5dc1 100644
+--- a/arch/arm/plat-mxc/pwm.c
++++ b/arch/arm/plat-mxc/pwm.c
+@@ -25,6 +25,11 @@
+ #define MX1_PWMS 0x04 /* PWM Sample Register */
+ #define MX1_PWMP 0x08 /* PWM Period Register */
+
++#define MX1_PWMC_EN (1 << 4)
++#define MX1_PWMC_PRESCALER_MASK (0x7f << 8)
++#define MX1_PWMC_PRESCALER(x) ((x & 0x7f) << 8)
++#define MX1_PWMC_CLKSEL_MASK 0x3
++#define MX1_PWMC_CLKSEL(x) ((x & 0x3))
+
+ /* i.MX27, i.MX31, i.MX35 share the same PWM function block: */
+
+@@ -54,25 +59,32 @@ struct pwm_device {
+
+ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+ {
++ unsigned long long c;
++ unsigned long period_cycles, duty_cycles, prescale;
++
+ if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
+ return -EINVAL;
+
+- if (cpu_is_mx27() || cpu_is_mx3() || cpu_is_mx25()) {
+- unsigned long long c;
+- unsigned long period_cycles, duty_cycles, prescale;
+- u32 cr;
++ c = clk_get_rate(pwm->clk);
++
++ c = c * period_ns;
++
++ if (cpu_is_mx1() || cpu_is_mx2())
++ c >>= 1;
+
+- c = clk_get_rate(pwm->clk);
+- c = c * period_ns;
+- do_div(c, 1000000000);
+- period_cycles = c;
++ do_div(c, 1000000000);
++ period_cycles = c;
+
+- prescale = period_cycles / 0x10000 + 1;
++ prescale = period_cycles / 0x10000 + 1;
+
+- period_cycles /= prescale;
+- c = (unsigned long long)period_cycles * duty_ns;
+- do_div(c, period_ns);
+- duty_cycles = c;
++ period_cycles /= prescale;
++ c = (unsigned long long)period_cycles * duty_ns;
++ do_div(c, period_ns);
++ duty_cycles = c;
++
++
++ if (cpu_is_mx27() || cpu_is_mx3() || cpu_is_mx25()) {
++ u32 cr;
+
+ writel(duty_cycles, pwm->mmio_base + MX3_PWMSAR);
+ writel(period_cycles, pwm->mmio_base + MX3_PWMPR);
+@@ -86,25 +98,28 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+
+ writel(cr, pwm->mmio_base + MX3_PWMCR);
+ } else if (cpu_is_mx1() || cpu_is_mx21()) {
+- /* The PWM subsystem allows for exact frequencies. However,
+- * I cannot connect a scope on my device to the PWM line and
+- * thus cannot provide the program the PWM controller
+- * exactly. Instead, I'm relying on the fact that the
+- * Bootloader (u-boot or WinCE+haret) has programmed the PWM
+- * function group already. So I'll just modify the PWM sample
+- * register to follow the ratio of duty_ns vs. period_ns
+- * accordingly.
+- *
+- * This is good enough for programming the brightness of
+- * the LCD backlight.
+- *
+- * The real implementation would divide PERCLK[0] first by
+- * both the prescaler (/1 .. /128) and then by CLKSEL
+- * (/2 .. /16).
+- */
+- u32 max = readl(pwm->mmio_base + MX1_PWMP);
+- u32 p = max * duty_ns / period_ns;
+- writel(max - p, pwm->mmio_base + MX1_PWMS);
++ unsigned long clksel = 0;
++ u32 ctrl;
++
++ while (prescale >= 0x80 && clksel < 4) {
++ prescale >>= 1;
++ ++clksel;
++ }
++
++ if (clksel > 3)
++ return -EINVAL;
++
++ ctrl = readl(pwm->mmio_base + MX1_PWMC);
++ writel(ctrl & ~MX1_PWMC_EN, pwm->mmio_base + MX1_PWMC);
++
++ writel(duty_cycles, pwm->mmio_base + MX1_PWMS);
++ writel(period_cycles, pwm->mmio_base + MX1_PWMP);
++
++ ctrl &= ~(MX1_PWMC_PRESCALER_MASK | MX1_PWMC_CLKSEL_MASK);
++ ctrl |= MX1_PWMC_PRESCALER(prescale);
++ ctrl |= MX1_PWMC_CLKSEL(clksel);
++ writel(ctrl, pwm->mmio_base + MX1_PWMC);
++
+ } else {
+ BUG();
+ }
+@@ -116,6 +130,11 @@ EXPORT_SYMBOL(pwm_config);
+ int pwm_enable(struct pwm_device *pwm)
+ {
+ int rc = 0;
++ if (cpu_is_mx1() || cpu_is_mx2()) {
++ u32 ctrl;
++ ctrl = readl(pwm->mmio_base + MX1_PWMC);
++ writel(ctrl | MX1_PWMC_EN, pwm->mmio_base + MX1_PWMC);
++ }
+
+ if (!pwm->clk_enabled) {
+ rc = clk_enable(pwm->clk);
+@@ -128,7 +147,13 @@ EXPORT_SYMBOL(pwm_enable);
+
+ void pwm_disable(struct pwm_device *pwm)
+ {
+- writel(0, pwm->mmio_base + MX3_PWMCR);
++ if (cpu_is_mx27() || cpu_is_mx3() || cpu_is_mx25()) {
++ writel(0, pwm->mmio_base + MX3_PWMCR);
++ } else if (cpu_is_mx1() || cpu_is_mx2()) {
++ u32 ctrl;
++ ctrl = readl(pwm->mmio_base + MX1_PWMC);
++ writel(ctrl & ~MX1_PWMC_EN, pwm->mmio_base + MX1_PWMC);
++ }
+
+ if (pwm->clk_enabled) {
+ clk_disable(pwm->clk);
projects / openwrt / svn-archive / archive.git / commitdiff