imx21: R.I.P.

It is broken since ~22 months and nobody takes care of that.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35487 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 0 insertions, 137 deletions

diff --git a/target/linux/imx21/patches/040-pwm.patch b/target/linux/imx21/patches/040-pwm.patch
deleted file mode 100644
index af47ad1de0..0000000000
--- a/target/linux/imx21/patches/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);