tegra20: add USB ULPI init code

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>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>

diff --git a/README b/README
index dd250a0fa8071f96393ef23a5cfa536d541c46b5..9804cea91447ec52e76e90289c8cfe05586dc4ee 100644 (file)
--- a/README
+++ b/README
@@ -1268,6 +1268,9 @@ The following options need to be configured:
                viewport is supported.
                To enable the ULPI layer support, define CONFIG_USB_ULPI and
                CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
+               If your ULPI phy needs a different reference clock than the
+               standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
+               the appropriate value in Hz.
 
 - MMC Support:
                The MMC controller on the Intel PXA is supported. To

diff --git a/arch/arm/cpu/armv7/tegra20/usb.c b/arch/arm/cpu/armv7/tegra20/usb.c
index eda8e6f14382ff61c5b39594461b41edea9117fb..1b52b16e2953413fd9dd1919a3d61bf0c7b3d5b5 100644 (file)
--- 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 @@ void usbf_reset_controller(struct fdt_usb *config, struct usb_ctlr *usbctlr)
         */
 }
 
-/* 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;
@@ -297,17 +307,115 @@ static int init_usb_controller(struct fdt_usb *config,
        if (!loop_count)
                return -1;
 
-       return 0;
-}
+       /* Disable ICUSB FS/LS transceiver */
+       clrbits_le32(&usbctlr->icusb_ctrl, IC_ENB1);
+
+       /* Select UTMI parallel interface */
+       clrsetbits_le32(&usbctlr->port_sc1, PTS_MASK,
+                       PTS_UTMI << PTS_SHIFT);
+       clrbits_le32(&usbctlr->port_sc1, STS);
 
-static void power_up_port(struct usb_ctlr *usbctlr)
-{
        /* Deassert power down state */
        clrbits_le32(&usbctlr->utmip_xcvr_cfg0, UTMIP_FORCE_PD_POWERDOWN |
                UTMIP_FORCE_PD2_POWERDOWN | UTMIP_FORCE_PDZI_POWERDOWN);
        clrbits_le32(&usbctlr->utmip_xcvr_cfg1, UTMIP_FORCE_PDDISC_POWERDOWN |
                UTMIP_FORCE_PDCHRP_POWERDOWN | UTMIP_FORCE_PDDR_POWERDOWN);
+
+       return 0;
+}
+
+#ifdef CONFIG_USB_ULPI
+/* if board file does not set a ULPI reference frequency we default to 24MHz */
+#ifndef CONFIG_ULPI_REF_CLK
+#define CONFIG_ULPI_REF_CLK 24000000
+#endif
+
+/* 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_viewport ulpi_vp;
+
+       /* set up ULPI reference clock on pllp_out4 */
+       clock_enable(PERIPH_ID_DEV2_OUT);
+       clock_set_pllout(CLOCK_ID_PERIPH, PLL_OUT4, CONFIG_ULPI_REF_CLK);
+
+       /* 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)) {
+               printf("Tegra ULPI viewport init failed\n");
+               return -1;
+       }
+
+       ulpi_set_vbus(&ulpi_vp, 1, 1);
+       ulpi_set_vbus_indicator(&ulpi_vp, 1, 1, 0);
+
+       /* enable wakeup events */
+       setbits_le32(&usbctlr->port_sc1, WKCN | WKDS | WKOC);
+
+       /* Enable and wait for the phy clock to become valid in 100 ms */
+       setbits_le32(&usbctlr->susp_ctrl, USB_SUSP_CLR);
+       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;
 }
+#else
+static int init_ulpi_usb_controller(struct fdt_usb *config,
+                               struct usb_ctlr *usbctlr)
+{
+       printf("No code to set up ULPI controller, please enable"
+                       "CONFIG_USB_ULPI and CONFIG_USB_ULPI_VIEWPORT");
+       return -1;
+}
+#endif
 
 static void config_clock(const u32 timing[])
 {
@@ -327,24 +435,21 @@ static int add_port(struct fdt_usb *config, const u32 timing[])
        struct usb_ctlr *usbctlr = config->reg;
 
        if (port_count == USB_PORTS_MAX) {
-               debug("tegrausb: Cannot register more than %d ports\n",
+               printf("tegrausb: Cannot register more than %d ports\n",
                      USB_PORTS_MAX);
                return -1;
        }
-       if (init_usb_controller(config, usbctlr, timing)) {
-               debug("tegrausb: Cannot init port\n");
+
+       if (config->utmi && init_utmi_usb_controller(config, usbctlr, timing)) {
+               printf("tegrausb: Cannot init port\n");
                return -1;
        }
-       if (config->utmi) {
-               /* Disable ICUSB FS/LS transceiver */
-               clrbits_le32(&usbctlr->icusb_ctrl, IC_ENB1);
-
-               /* Select UTMI parallel interface */
-               clrsetbits_le32(&usbctlr->port_sc1, PTS_MASK,
-                               PTS_UTMI << PTS_SHIFT);
-               clrbits_le32(&usbctlr->port_sc1, STS);
-               power_up_port(usbctlr);
+
+       if (config->ulpi && init_ulpi_usb_controller(config, usbctlr)) {
+               printf("tegrausb: Cannot init port\n");
+               return -1;
        }
+
        port[port_count++] = *config;
 
        return 0;
@@ -406,6 +511,7 @@ int fdt_decode_usb(const void *blob, int node, unsigned osc_frequency_mhz,
 
        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");
@@ -415,10 +521,13 @@ int fdt_decode_usb(const void *blob, int node, unsigned osc_frequency_mhz,
                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 4bbd4aa5a32e79330b251fb9bc5edb3b95297d77..fdbd127e6c00c15546f8dc5da14c332bc347657a 100644 (file)
--- 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)