[U-Boot] [PATCH 3/3] tegra20: add USB ULPI init code

[Lucas Stach <dev@lynxeye.de>]

This adds the required code to set up a ULPI USB port. It is
mostly a port of the Linux ULPI setup code with some tweaks
added for more correctness, discovered along the way of
debugging this.

To use this both CONFIG_USB_ULPI and CONFIG_USB_ULPI_VIEWPORT
have to be set in the board configuration file.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
---
 arch/arm/cpu/armv7/tegra20/usb.c        | 131 +++++++++++++++++++++++++++++---
 arch/arm/include/asm/arch-tegra20/usb.h |  29 +++++--
 2 Dateien ge?ndert, 145 Zeilen hinzugef?gt(+), 15 Zeilen entfernt(-)

diff --git a/arch/arm/cpu/armv7/tegra20/usb.c b/arch/arm/cpu/armv7/tegra20/usb.c
index 77966e5..2ae1244 100644
--- a/arch/arm/cpu/armv7/tegra20/usb.c
+++ b/arch/arm/cpu/armv7/tegra20/usb.c
@@ -32,9 +32,17 @@
 #include <asm/arch/sys_proto.h>
 #include <asm/arch/uart.h>
 #include <asm/arch/usb.h>
+#include <usb/ulpi.h>
 #include <libfdt.h>
 #include <fdtdec.h>
 
+#ifdef CONFIG_USB_ULPI
+	#ifndef CONFIG_USB_ULPI_VIEWPORT
+	#error "To use CONFIG_USB_ULPI on Tegra Boards you have to also \
+	       define CONFIG_USB_ULPI_VIEWPORT"
+	#endif
+#endif
+
 enum {
 	USB_PORTS_MAX	= 4,			/* Maximum ports we allow */
 };
@@ -68,11 +76,13 @@ enum dr_mode {
 struct fdt_usb {
 	struct usb_ctlr *reg;	/* address of registers in physical memory */
 	unsigned utmi:1;	/* 1 if port has external tranceiver, else 0 */
+	unsigned ulpi:1;	/* 1 if port has external ULPI transceiver */
 	unsigned enabled:1;	/* 1 to enable, 0 to disable */
 	unsigned has_legacy_mode:1; /* 1 if this port has legacy mode */
 	enum dr_mode dr_mode;	/* dual role mode */
 	enum periph_id periph_id;/* peripheral id */
 	struct fdt_gpio_state vbus_gpio;	/* GPIO for vbus enable */
+	struct fdt_gpio_state phy_reset_gpio; /* GPIO to reset ULPI phy */
 };
 
 static struct fdt_usb port[USB_PORTS_MAX];	/* List of valid USB ports */
@@ -187,8 +197,8 @@ static void usbf_reset_controller(struct fdt_usb *config,
 	 */
 }
 
-/* set up the USB controller with the parameters provided */
-static int init_usb_controller(struct fdt_usb *config,
+/* set up the UTMI USB controller with the parameters provided */
+static int init_utmi_usb_controller(struct fdt_usb *config,
 				struct usb_ctlr *usbctlr, const u32 timing[])
 {
 	u32 val;
@@ -300,6 +310,83 @@ static int init_usb_controller(struct fdt_usb *config,
 	return 0;
 }
 
+#ifdef CONFIG_USB_ULPI
+/* set up the ULPI USB controller with the parameters provided */
+static int init_ulpi_usb_controller(struct fdt_usb *config,
+                                    struct usb_ctlr *usbctlr)
+{
+	u32 val;
+	int loop_count;
+	struct ulpi_regs *ulpi_reg = (struct ulpi_regs *)0;
+	struct ulpi_viewport ulpi_vp;
+
+	/* reset ULPI phy */
+	if (fdt_gpio_isvalid(&config->phy_reset_gpio)) {
+		fdtdec_setup_gpio(&config->phy_reset_gpio);
+		gpio_direction_output(config->phy_reset_gpio.gpio, 0);
+		mdelay(5);
+		gpio_set_value(config->phy_reset_gpio.gpio, 1);
+	}
+
+	/* Reset the usb controller */
+	clock_enable(config->periph_id);
+	usbf_reset_controller(config, usbctlr);
+
+	/* enable pinmux bypass */
+	setbits_le32(&usbctlr->ulpi_timing_ctrl_0,
+	             ULPI_CLKOUT_PINMUX_BYP | ULPI_OUTPUT_PINMUX_BYP);
+
+	/* Select ULPI parallel interface */
+	clrsetbits_le32(&usbctlr->port_sc1, PTS_MASK, PTS_ULPI << PTS_SHIFT);
+
+	/* enable ULPI transceiver */
+	setbits_le32(&usbctlr->susp_ctrl, ULPI_PHY_ENB);
+
+	/* configure ULPI transceiver timings */
+	val = 0;
+	writel(val, &usbctlr->ulpi_timing_ctrl_1);
+
+	val |= ULPI_DATA_TRIMMER_SEL(4);
+	val |= ULPI_STPDIRNXT_TRIMMER_SEL(4);
+	val |= ULPI_DIR_TRIMMER_SEL(4);
+	writel(val, &usbctlr->ulpi_timing_ctrl_1);
+	udelay(10);
+
+	val |= ULPI_DATA_TRIMMER_LOAD;
+	val |= ULPI_STPDIRNXT_TRIMMER_LOAD;
+	val |= ULPI_DIR_TRIMMER_LOAD;
+	writel(val, &usbctlr->ulpi_timing_ctrl_1);
+
+	/* set up phy for host operation with external vbus supply */
+	ulpi_vp.port_num = 0;
+	ulpi_vp.viewport_addr = (u32)&usbctlr->ulpi_viewport;
+
+	if (ulpi_init(&ulpi_vp)) {
+		debug("Tegra ULPI viewport init failed\n");
+		return -1;
+	}
+
+	ulpi_write(&ulpi_vp, &ulpi_reg->iface_ctrl_set, ULPI_IFACE_PASSTHRU);
+	ulpi_write(&ulpi_vp, &ulpi_reg->otg_ctrl_set, ULPI_OTG_EXTVBUSIND);
+
+	/* enable wakeup events */
+	setbits_le32(&usbctlr->port_sc1, WKCN | WKDS | WKOC);
+
+	setbits_le32(&usbctlr->susp_ctrl, USB_SUSP_CLR);
+	/* Wait for the phy clock to become valid in 100 ms */
+	for (loop_count = 100000; loop_count != 0; loop_count--) {
+		if (readl(&usbctlr->susp_ctrl) & USB_PHY_CLK_VALID)
+			break;
+		udelay(1);
+	}
+	if (!loop_count)
+		return -1;
+	clrbits_le32(&usbctlr->susp_ctrl, USB_SUSP_CLR);
+
+	return 0;
+}
+#endif
+
 static void power_up_port(struct usb_ctlr *usbctlr)
 {
 	/* Deassert power down state */
@@ -331,11 +418,13 @@ static int add_port(struct fdt_usb *config, const u32 timing[])
 		      USB_PORTS_MAX);
 		return -1;
 	}
-	if (init_usb_controller(config, usbctlr, timing)) {
-		debug("tegrausb: Cannot init port\n");
-		return -1;
-	}
+
 	if (config->utmi) {
+		if (init_utmi_usb_controller(config, usbctlr, timing)) {
+			debug("tegrausb: Cannot init port\n");
+			return -1;
+		}
+
 		/* Disable ICUSB FS/LS transceiver */
 		clrbits_le32(&usbctlr->icusb_ctrl, IC_ENB1);
 
@@ -345,6 +434,24 @@ static int add_port(struct fdt_usb *config, const u32 timing[])
 		clrbits_le32(&usbctlr->port_sc1, STS);
 		power_up_port(usbctlr);
 	}
+
+	if (config->ulpi) {
+#ifdef CONFIG_USB_ULPI
+		/* set up 24MHz ULPI reference clock on pllp_out4 */
+		clock_enable(PERIPH_ID_DEV2_OUT);
+		clock_set_pllout(CLOCK_ID_PERIPH, PLL_OUT4, 24000000);
+
+		if (init_ulpi_usb_controller(config, usbctlr)) {
+			debug("tegrausb: Cannot init port\n");
+			return -1;
+		}
+#else
+		debug("No code to set up ULPI controller, please enable"
+		      "CONFIG_USB_ULPI and CONFIG_USB_ULPI_VIEWPORT");
+		return -1;
+#endif
+	}
+
 	port[port_count++] = *config;
 
 	return 0;
@@ -411,6 +518,7 @@ static int fdt_decode_usb(const void *blob, int node,
 
 	phy = fdt_getprop(blob, node, "phy_type", NULL);
 	config->utmi = phy && 0 == strcmp("utmi", phy);
+	config->ulpi = phy && 0 == strcmp("ulpi", phy);
 	config->enabled = fdtdec_get_is_enabled(blob, node);
 	config->has_legacy_mode = fdtdec_get_bool(blob, node,
 						  "nvidia,has-legacy-mode");
@@ -420,10 +528,13 @@ static int fdt_decode_usb(const void *blob, int node,
 		return -FDT_ERR_NOTFOUND;
 	}
 	fdtdec_decode_gpio(blob, node, "nvidia,vbus-gpio", &config->vbus_gpio);
-	debug("enabled=%d, legacy_mode=%d, utmi=%d, periph_id=%d, vbus=%d, "
-	      "dr_mode=%d\n", config->enabled, config->has_legacy_mode,
-	      config->utmi, config->periph_id, config->vbus_gpio.gpio,
-	      config->dr_mode);
+	fdtdec_decode_gpio(blob, node, "nvidia,phy-reset-gpio",
+	                   &config->phy_reset_gpio);
+	debug("enabled=%d, legacy_mode=%d, utmi=%d, ulpi=%d, periph_id=%d, "
+	      "vbus=%d, phy_reset=%d, dr_mode=%d\n",
+	      config->enabled, config->has_legacy_mode, config->utmi, config->ulpi,
+	      config->periph_id, config->vbus_gpio.gpio,
+	      config->phy_reset_gpio.gpio, config->dr_mode);
 
 	return 0;
 }
diff --git a/arch/arm/include/asm/arch-tegra20/usb.h b/arch/arm/include/asm/arch-tegra20/usb.h
index 638033b..bd89d66 100644
--- a/arch/arm/include/asm/arch-tegra20/usb.h
+++ b/arch/arm/include/asm/arch-tegra20/usb.h
@@ -100,10 +100,12 @@ struct usb_ctlr {
 
 	/* 0x410 */
 	uint usb1_legacy_ctrl;
-	uint reserved12[3];
+	uint reserved12[4];
 
-	/* 0x420 */
-	uint reserved13[56];
+	/* 0x424 */
+	uint ulpi_timing_ctrl_0;
+	uint ulpi_timing_ctrl_1;
+	uint reserved13[53];
 
 	/* 0x500 */
 	uint reserved14[64 * 3];
@@ -144,10 +146,24 @@ struct usb_ctlr {
 #define VBUS_SENSE_CTL_AB_SESS_VLD		2
 #define VBUS_SENSE_CTL_A_SESS_VLD		3
 
+/* USB2_IF_ULPI_TIMING_CTRL_0 */
+#define ULPI_OUTPUT_PINMUX_BYP			(1 << 10)
+#define ULPI_CLKOUT_PINMUX_BYP			(1 << 11)
+
+/* USB2_IF_ULPI_TIMING_CTRL_1 */
+#define ULPI_DATA_TRIMMER_LOAD			(1 << 0)
+#define ULPI_DATA_TRIMMER_SEL(x)		(((x) & 0x7) << 1)
+#define ULPI_STPDIRNXT_TRIMMER_LOAD		(1 << 16)
+#define ULPI_STPDIRNXT_TRIMMER_SEL(x)	(((x) & 0x7) << 17)
+#define ULPI_DIR_TRIMMER_LOAD			(1 << 24)
+#define ULPI_DIR_TRIMMER_SEL(x)			(((x) & 0x7) << 25)
+
 /* USBx_IF_USB_SUSP_CTRL_0 */
+#define ULPI_PHY_ENB				(1 << 13)
 #define UTMIP_PHY_ENB			        (1 << 12)
 #define UTMIP_RESET			        (1 << 11)
 #define USB_PHY_CLK_VALID			(1 << 7)
+#define USB_SUSP_CLR				(1 << 5)
 
 /* USBx_UTMIP_MISC_CFG1 */
 #define UTMIP_PLLU_STABLE_COUNT_SHIFT		6
@@ -203,12 +219,15 @@ struct usb_ctlr {
 /* SB2_CONTROLLER_2_USB2D_PORTSC1_0 */
 #define PTS_SHIFT				30
 #define PTS_MASK				(3U << PTS_SHIFT)
-#define PTS_UTMI	0
+#define PTS_UTMI		0
 #define PTS_RESERVED	1
-#define PTS_ULP		2
+#define PTS_ULPI		2
 #define PTS_ICUSB_SER	3
 
 #define STS					(1 << 29)
+#define WKOC				(1 << 22)
+#define WKDS				(1 << 21)
+#define WKCN				(1 << 20)
 
 /* USBx_UTMIP_XCVR_CFG0_0 */
 #define UTMIP_FORCE_PD_POWERDOWN		(1 << 14)
-- 
1.7.11.2