diff options
Diffstat (limited to 'target/linux/mx2/patches-2.6.34/040-pwm.patch')
| -rw-r--r-- | target/linux/mx2/patches-2.6.34/040-pwm.patch | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/target/linux/mx2/patches-2.6.34/040-pwm.patch b/target/linux/mx2/patches-2.6.34/040-pwm.patch deleted file mode 100644 index af47ad1de0..0000000000 --- a/target/linux/mx2/patches-2.6.34/040-pwm.patch +++ /dev/null @@ -1,137 +0,0 @@ ---- 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: */ - -@@ -54,26 +59,33 @@ 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; - -+ c = clk_get_rate(pwm->clk); -+ -+ c = c * period_ns; -+ -+ if (cpu_is_mx1() || cpu_is_mx2()) -+ c >>= 1; -+ -+ do_div(c, 1000000000); -+ period_cycles = c; -+ -+ prescale = period_cycles / 0x10000 + 1; -+ -+ 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()) { -- unsigned long long c; -- unsigned long period_cycles, duty_cycles, prescale; - u32 cr; - -- c = clk_get_rate(pwm->clk); -- c = c * period_ns; -- do_div(c, 1000000000); -- period_cycles = c; -- -- prescale = period_cycles / 0x10000 + 1; -- -- period_cycles /= prescale; -- c = (unsigned long long)period_cycles * duty_ns; -- do_div(c, period_ns); -- duty_cycles = c; -- - 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, i - - 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 +131,11 @@ 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 +148,13 @@ 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); |