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

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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
This commit is contained in:
John Crispin 2015-03-11 17:08:02 +00:00
parent 5b04e0dc4e
commit a23da431dc
1 changed files with 95 additions and 0 deletions
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95
target/linux/lantiq/patches-3.18/0039-MIPS-lantiq-initialize-usb-on-boot.patch Normal file
View file

@ -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;