lantiq: Add usb initialization bits from ltq-hcd to platform init

Add VR9 specific usb initialization bits from ltq-hcd to platform
initialization.

This patch is more of a proof-of-concept than production quality
since the initialization registers are different on other lantiq
platforms.

Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Vincent Pelletier <plr.vincent@gmail.com>

SVN-Revision: 44672

target/linux/lantiq/patches-3.18/0039-MIPS-lantiq-initialize-usb-on-boot.patch

@@ -0,0 +1,95 @@
+--- a/arch/mips/lantiq/xway/reset.c	2015-02-09 18:23:01.837007936 +0200
++++ b/arch/mips/lantiq/xway/reset.c	2015-02-09 19:16:43.006081435 +0200
+@@ -44,6 +44,37 @@
+ #define RCU_BOOT_SEL(x)		((x >> 18) & 0x7)
+ #define RCU_BOOT_SEL_XRX200(x)	(((x >> 17) & 0xf) | ((x >> 8) & 0x10))
+ 
++/* dwc2 USB configuration registers */
++#define RCU_USB1CFG		0x0018
++#define RCU_USB2CFG		0x0034
++
++/* USB DMA endianness bits */
++#define RCU_USBCFG_HDSEL_BIT	BIT(11)
++#define RCU_USBCFG_HOST_END_BIT	BIT(10)
++#define RCU_USBCFG_SLV_END_BIT	BIT(9)
++
++/* USB reset bits */
++#define RCU_USBRESET		0x0010
++
++#define USBRESET_BIT		BIT(4)
++
++#define RCU_USBRESET2		0x0048
++
++#define USB1RESET_BIT		BIT(4)
++#define USB2RESET_BIT		BIT(5)
++
++#define RCU_CFG1A		0x0038
++#define RCU_CFG1B		0x003C
++
++/* USB PMU devices */
++#define PMU_AHBM		BIT(15)
++#define PMU_USB0		BIT(6)
++#define PMU_USB1		BIT(27)
++
++/* USB PHY PMU devices */
++#define PMU_USB0_P		BIT(0)
++#define PMU_USB1_P		BIT(26)
++
+ /* remapped base addr of the reset control unit */
+ static void __iomem *ltq_rcu_membase;
+ static struct device_node *ltq_rcu_np;
+@@ -200,6 +231,45 @@
+ 	unreachable();
+ }
+ 
++static void ltq_usb_init(void)
++{
++	/* Power for USB cores 1 & 2 */
++	ltq_pmu_enable(PMU_AHBM);
++	ltq_pmu_enable(PMU_USB0);
++	ltq_pmu_enable(PMU_USB1);
++
++	ltq_rcu_w32(ltq_rcu_r32(RCU_CFG1A) | BIT(0), RCU_CFG1A);
++	ltq_rcu_w32(ltq_rcu_r32(RCU_CFG1B) | BIT(0), RCU_CFG1B);
++
++	/* Enable USB PHY power for cores 1 & 2 */
++	ltq_pmu_enable(PMU_USB0_P);
++	ltq_pmu_enable(PMU_USB1_P);
++
++	/* Configure cores to host mode */
++	ltq_rcu_w32(ltq_rcu_r32(RCU_USB1CFG) & ~RCU_USBCFG_HDSEL_BIT,
++		RCU_USB1CFG);
++	ltq_rcu_w32(ltq_rcu_r32(RCU_USB2CFG) & ~RCU_USBCFG_HDSEL_BIT,
++		RCU_USB2CFG);
++
++	/* Select DMA endianness (Host-endian: big-endian) */
++	ltq_rcu_w32((ltq_rcu_r32(RCU_USB1CFG) & ~RCU_USBCFG_SLV_END_BIT)
++		| RCU_USBCFG_HOST_END_BIT, RCU_USB1CFG);
++	ltq_rcu_w32(ltq_rcu_r32((RCU_USB2CFG) & ~RCU_USBCFG_SLV_END_BIT)
++		| RCU_USBCFG_HOST_END_BIT, RCU_USB2CFG);
++
++	/* Hard reset USB state machines */
++	ltq_rcu_w32(ltq_rcu_r32(RCU_USBRESET) | USBRESET_BIT, RCU_USBRESET);
++	udelay(50 * 1000);
++	ltq_rcu_w32(ltq_rcu_r32(RCU_USBRESET) & ~USBRESET_BIT, RCU_USBRESET);
++
++	/* Soft reset USB state machines */
++	ltq_rcu_w32(ltq_rcu_r32(RCU_USBRESET2)
++		| USB1RESET_BIT | USB2RESET_BIT, RCU_USBRESET2);
++	udelay(50 * 1000);
++	ltq_rcu_w32(ltq_rcu_r32(RCU_USBRESET2)
++		& ~(USB1RESET_BIT | USB2RESET_BIT), RCU_USBRESET2);
++}
++
+ static int __init mips_reboot_setup(void)
+ {
+ 	struct resource res;
+@@ -223,6 +293,8 @@
+ 	if (!ltq_rcu_membase)
+ 		panic("Failed to remap core memory");
+ 
++	ltq_usb_init();
++
+ 	_machine_restart = ltq_machine_restart;
+ 	_machine_halt = ltq_machine_halt;
+ 	pm_power_off = ltq_machine_power_off;