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Subject[PATCH v3] ARM: LPC32xx: USB Support
Date
This patch adds OHCI support to the LPC32xx ARM platform. Besides the trivial
addition of platform "usb-ohci" support, fixes for the USB PLL have been added
to arch/arm/mach-lpc32xx/clock.c, ported from NXP's lpclinux.com.

(This is the mach-lpc32xx specific part, the USB subsystem specific changes are
in a separate patch for the USB maintainers.)

Signed-off-by: Roland Stigge <stigge@antcom.de>

---
arch/arm/mach-lpc32xx/clock.c | 87 ++++++++++++++++++--------
arch/arm/mach-lpc32xx/common.c | 26 +++++++
arch/arm/mach-lpc32xx/common.h | 1
arch/arm/mach-lpc32xx/include/mach/platform.h | 10 ++
arch/arm/mach-lpc32xx/phy3250.c | 1
5 files changed, 101 insertions(+), 24 deletions(-)
--- linux-2.6.orig/arch/arm/mach-lpc32xx/clock.c
+++ linux-2.6/arch/arm/mach-lpc32xx/clock.c
@@ -87,6 +87,7 @@
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/device.h>
+#include <linux/delay.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/amba/bus.h>
@@ -100,6 +101,8 @@

static DEFINE_SPINLOCK(global_clkregs_lock);

+static int usb_pll_enable, usb_pll_valid;
+
static struct clk clk_armpll;
static struct clk clk_usbpll;

@@ -384,30 +387,62 @@ static u32 local_clk_usbpll_setup(struct
static int local_usbpll_enable(struct clk *clk, int enable)
{
u32 reg;
- int ret = -ENODEV;
- unsigned long timeout = jiffies + msecs_to_jiffies(10);
+ int ret = 0;
+ unsigned long timeout = jiffies + msecs_to_jiffies(20);

reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);

- if (enable == 0) {
- reg &= ~(LPC32XX_CLKPWR_USBCTRL_CLK_EN1 |
- LPC32XX_CLKPWR_USBCTRL_CLK_EN2);
- __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
- } else if (reg & LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP) {
+ __raw_writel(reg & ~(LPC32XX_CLKPWR_USBCTRL_CLK_EN2 |
+ LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP),
+ LPC32XX_CLKPWR_USB_CTRL);
+ __raw_writel(reg & ~LPC32XX_CLKPWR_USBCTRL_CLK_EN1,
+ LPC32XX_CLKPWR_USB_CTRL);
+
+ if (enable && usb_pll_valid && usb_pll_enable) {
+ ret = -ENODEV;
+ /*
+ * If the PLL rate has been previously set, then the rate
+ * in the PLL register is valid and can be enabled here.
+ * Otherwise, it needs to be enabled as part of setrate.
+ */
+
+ /*
+ * Gate clock into PLL
+ */
reg |= LPC32XX_CLKPWR_USBCTRL_CLK_EN1;
__raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);

- /* Wait for PLL lock */
+ /*
+ * Enable PLL
+ */
+ reg |= LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP;
+ __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
+
+ /*
+ * Wait for PLL to lock
+ */
while (time_before(jiffies, timeout) && (ret == -ENODEV)) {
reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);
if (reg & LPC32XX_CLKPWR_USBCTRL_PLL_STS)
ret = 0;
+ else
+ udelay(10);
}

+ /*
+ * Gate clock from PLL if PLL is locked
+ */
if (ret == 0) {
- reg |= LPC32XX_CLKPWR_USBCTRL_CLK_EN2;
- __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
+ __raw_writel(reg | LPC32XX_CLKPWR_USBCTRL_CLK_EN2,
+ LPC32XX_CLKPWR_USB_CTRL);
+ } else {
+ __raw_writel(reg & ~(LPC32XX_CLKPWR_USBCTRL_CLK_EN1 |
+ LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP),
+ LPC32XX_CLKPWR_USB_CTRL);
}
+ } else if ((enable == 0) && usb_pll_valid && usb_pll_enable) {
+ usb_pll_valid = 0;
+ usb_pll_enable = 0;
}

return ret;
@@ -425,7 +460,7 @@ static unsigned long local_usbpll_round_
*/
rate = rate * 1000;

- clkin = clk->parent->rate;
+ clkin = clk->get_rate(clk);
usbdiv = (__raw_readl(LPC32XX_CLKPWR_USBCLK_PDIV) &
LPC32XX_CLKPWR_USBPDIV_PLL_MASK) + 1;
clkin = clkin / usbdiv;
@@ -439,7 +474,8 @@ static unsigned long local_usbpll_round_

static int local_usbpll_set_rate(struct clk *clk, unsigned long rate)
{
- u32 clkin, reg, usbdiv;
+ int ret = -ENODEV;
+ u32 clkin, usbdiv;
struct clk_pll_setup pllsetup;

/*
@@ -448,7 +484,7 @@ static int local_usbpll_set_rate(struct
*/
rate = rate * 1000;

- clkin = clk->get_rate(clk);
+ clkin = clk->get_rate(clk->parent);
usbdiv = (__raw_readl(LPC32XX_CLKPWR_USBCLK_PDIV) &
LPC32XX_CLKPWR_USBPDIV_PLL_MASK) + 1;
clkin = clkin / usbdiv;
@@ -457,22 +493,25 @@ static int local_usbpll_set_rate(struct
if (local_clk_find_pll_cfg(clkin, rate, &pllsetup) == 0)
return -EINVAL;

+ /*
+ * Disable PLL clocks during PLL change
+ */
local_usbpll_enable(clk, 0);
-
- reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);
- reg |= LPC32XX_CLKPWR_USBCTRL_CLK_EN1;
- __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
-
- pllsetup.analog_on = 1;
+ pllsetup.analog_on = 0;
local_clk_usbpll_setup(&pllsetup);

- clk->rate = clk_check_pll_setup(clkin, &pllsetup);
+ /*
+ * Start USB PLL and check PLL status
+ */
+
+ usb_pll_valid = 1;
+ usb_pll_enable = 1;

- reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);
- reg |= LPC32XX_CLKPWR_USBCTRL_CLK_EN2;
- __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
+ ret = local_usbpll_enable(clk, 1);
+ if (ret >= 0)
+ clk->rate = clk_check_pll_setup(clkin, &pllsetup);

- return 0;
+ return ret;
}

static struct clk clk_usbpll = {
--- linux-2.6.orig/arch/arm/mach-lpc32xx/common.c
+++ linux-2.6/arch/arm/mach-lpc32xx/common.c
@@ -160,6 +160,32 @@ struct platform_device lpc32xx_adc_devic
};

/*
+ * USB support
+ */
+/* The dmamask must be set for OHCI to work */
+static u64 ohci_dmamask = ~(u32) 0;
+static struct resource ohci_resources[] = {
+ {
+ .start = IO_ADDRESS(LPC32XX_USB_BASE),
+ .end = IO_ADDRESS(LPC32XX_USB_BASE + 0x100 - 1),
+ .flags = IORESOURCE_MEM,
+ }, {
+ .start = IRQ_LPC32XX_USB_HOST,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+struct platform_device lpc32xx_ohci_device = {
+ .name = "usb-ohci",
+ .id = -1,
+ .dev = {
+ .dma_mask = &ohci_dmamask,
+ .coherent_dma_mask = 0xFFFFFFFF,
+ },
+ .num_resources = ARRAY_SIZE(ohci_resources),
+ .resource = ohci_resources,
+};
+
+/*
* Returns the unique ID for the device
*/
void lpc32xx_get_uid(u32 devid[4])
--- linux-2.6.orig/arch/arm/mach-lpc32xx/common.h
+++ linux-2.6/arch/arm/mach-lpc32xx/common.h
@@ -31,6 +31,7 @@ extern struct platform_device lpc32xx_i2
extern struct platform_device lpc32xx_tsc_device;
extern struct platform_device lpc32xx_adc_device;
extern struct platform_device lpc32xx_rtc_device;
+extern struct platform_device lpc32xx_ohci_device;

/*
* Other arch specific structures and functions
--- linux-2.6.orig/arch/arm/mach-lpc32xx/include/mach/platform.h
+++ linux-2.6/arch/arm/mach-lpc32xx/include/mach/platform.h
@@ -694,4 +694,14 @@
#define LPC32XX_GPIO_P2_MUX_CLR _GPREG(0x02C)
#define LPC32XX_GPIO_P2_MUX_STATE _GPREG(0x030)

+#ifdef CONFIG_USB_OHCI_HCD
+#define PNX4008_PWRMAN_BASE LPC32XX_CLK_PM_BASE
+#define PNX4008_USB_CONFIG_BASE LPC32XX_USB_BASE
+#define start_int_set_falling_edge(irq)
+#define start_int_set_rising_edge(irq)
+#define start_int_ack(irq)
+#define start_int_mask(irq)
+#define start_int_umask(irq)
+#endif
+
#endif
--- linux-2.6.orig/arch/arm/mach-lpc32xx/phy3250.c
+++ linux-2.6/arch/arm/mach-lpc32xx/phy3250.c
@@ -277,6 +277,7 @@ static struct platform_device *phy3250_d
&lpc32xx_watchdog_device,
&lpc32xx_gpio_led_device,
&lpc32xx_adc_device,
+ &lpc32xx_ohci_device,
};

static struct amba_device *amba_devs[] __initdata = {

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