[U-Boot] [PATCH v3 1/3] AM335x : Add USB support for AM335x in u-boot
Harman Sohanpal
harman_sohanpal at ti.com
Tue Jun 26 11:38:01 CEST 2012
From: Gene Zarkhin <gene_zarkhin at bose.com>
Adds USB support in uboot for AM335x.
By default the USB 1 module is enabled.
The support for USB 0 can be enabled by changing the
USB base address and the phy control register address
in the header file am335x.h.
USB 1 has a full size connector so acts in host mode and
USB 0 has a mini connector so used in device mode.
By default, the support is added for host mode hence USB 1
has been enabled by default.
Signed-off-by: Gene Zarkhin <gene_zarkhin at bose.com>
Signed-off-by: Harman Sohanpal <harman_sohanpal at ti.com>
---
Changes for v2:
- none
Changes for v3:
- Changed commit message to specify why USB 1
has been enabled by default.
drivers/usb/musb/Makefile | 1 +
drivers/usb/musb/am335x.c | 121 +++++++++++++++++++++++++++++++++++++++++++++
drivers/usb/musb/am335x.h | 113 ++++++++++++++++++++++++++++++++++++++++++
include/usb.h | 3 +-
4 files changed, 237 insertions(+), 1 deletions(-)
create mode 100644 drivers/usb/musb/am335x.c
create mode 100644 drivers/usb/musb/am335x.h
diff --git a/drivers/usb/musb/Makefile b/drivers/usb/musb/Makefile
index 20b5503..d00ec40 100644
--- a/drivers/usb/musb/Makefile
+++ b/drivers/usb/musb/Makefile
@@ -32,6 +32,7 @@ COBJS-$(CONFIG_USB_DAVINCI) += davinci.o
COBJS-$(CONFIG_USB_OMAP3) += omap3.o
COBJS-$(CONFIG_USB_DA8XX) += da8xx.o
COBJS-$(CONFIG_USB_AM35X) += am35x.o
+COBJS-$(CONFIG_USB_AM335X) += am335x.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/usb/musb/am335x.c b/drivers/usb/musb/am335x.c
new file mode 100644
index 0000000..4b59769
--- /dev/null
+++ b/drivers/usb/musb/am335x.c
@@ -0,0 +1,121 @@
+/*
+ * am335x.c - TI's AM335x platform specific usb wrapper functions.
+ *
+ * Author: gene Zarkhin <gene_zarkhin at bose.com>
+ * Modified by: Harman Sohanpal <harman_sohanpal at ti.com>
+ *
+ * Based on drivers/usb/musb/da8xx.c
+ *
+ * Copyright (c) 2012 Texas Instruments Incorporated
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <common.h>
+#include "am335x.h"
+
+/* MUSB platform configuration */
+struct musb_config musb_cfg = {
+ .regs = (struct musb_regs *)(AM335X_USB_OTG_CORE_BASE),
+ .timeout = AM335X_USB_OTG_TIMEOUT,
+ .musb_speed = 0,
+};
+
+/*
+ * Enable the USB phy
+ */
+static u8 phy_on(void)
+{
+ u32 timeout;
+ u32 regAddr = CM_REGISTERS + USB_CTRL0_REG_OFFSET;
+ u32 usb_ctrl_reg;
+
+ usb_ctrl_reg = readl(regAddr);
+ usb_ctrl_reg &= ~(CM_PHY_PWRDN | CM_PHY_OTG_PWRDN);
+ usb_ctrl_reg |= (OTGVDET_EN | OTGSESSENDEN);
+ writel(usb_ctrl_reg, regAddr);
+
+ timeout = musb_cfg.timeout;
+ writel(0x1, &am335x_usb_regs->ctrl);
+ udelay(6000);
+ while (timeout--) {
+ if ((readl(&am335x_usb_regs->ctrl) & SOFT_RESET_BIT) == 0)
+ return 1;
+ }
+ /* USB phy was not turned on */
+ return 0;
+}
+
+/*
+ * Disable the USB phy
+ */
+static void phy_off(void)
+{
+ u32 regAddr = CM_REGISTERS + USB_CTRL0_REG_OFFSET;
+ u32 usb_ctrl_reg;
+
+ usb_ctrl_reg = readl(regAddr);
+ usb_ctrl_reg |= (CM_PHY_PWRDN | CM_PHY_OTG_PWRDN);
+ writel(usb_ctrl_reg, regAddr);
+
+ /* Disable the USB module */
+ writel(PRCM_MODULE_DSBL, CM_PER_USB0_CLKCTRL);
+}
+
+/*
+ * This function performs platform specific initialization for usb0.
+ */
+int musb_platform_init(void)
+{
+ u32 timeout;
+ u32 revision;
+
+ /* USB */
+ /* PLL Gate set up */
+ writel(DPLL_CLKDCOLDO_GATE_CTRL, CM_CLKDCOLDO_DPLL_PER);
+
+ /* CLOCK */
+ writel(PRCM_MOD_EN, CM_PER_USB0_CLKCTRL);
+ timeout = musb_cfg.timeout;
+ while (timeout--) {
+ if (readl(CM_PER_USB0_CLKCTRL) != PRCM_MOD_EN)
+ continue;
+ else
+ break;
+ }
+ if (timeout == 0) {
+ printf("\nUSB module not enabled\nAborting");
+ return -1;
+ }
+
+ /* USB module fully functional */
+ /* start the on-chip usb phy and its pll */
+ if (phy_on() == 0)
+ return -1;
+ /* Returns zero if e.g. not clocked */
+ revision = readl(&am335x_usb_regs->revision);
+ if (revision == 0)
+ return -1;
+
+ return 0;
+}
+
+/*
+ * This function performs platform specific deinitialization for usb0.
+ */
+void musb_platform_deinit(void)
+{
+ /* Turn off the phy */
+ phy_off();
+}
diff --git a/drivers/usb/musb/am335x.h b/drivers/usb/musb/am335x.h
new file mode 100644
index 0000000..790531e
--- /dev/null
+++ b/drivers/usb/musb/am335x.h
@@ -0,0 +1,113 @@
+/*
+ * am335x.h - TI's AM335x platform specific usb wrapper definitions.
+ *
+ * Author: Gene Zarkhin <gene_zarkhin at bose.com>
+ * Modified by: Harman Sohanpal <harman_sohanpal at ti.com>
+ *
+ * Based on drivers/usb/musb/da8xx.h
+ *
+ * Copyright (c) 2012 Texas Instruments Incorporated
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __AM335X_USB_H__
+#define __AM335X_USB_H__
+
+#include "musb_core.h"
+/* PRCM Definitions */
+#define CM_CLKDCOLDO_DPLL_PER (CM_WKUP + 0x7c)
+#define CM_PER_USB0_CLKCTRL (CM_PER + 0x1c)
+#define PRCM_MOD_EN 0x2
+#define PRCM_MODULE_DSBL 0x0
+
+
+/* Control Module Registers */
+#define CM_REGISTERS CTRL_BASE
+#define USB_CTRL0_REG_OFFSET (0x628)
+#define USB_CTRL1_REG_OFFSET (0x680)
+
+#define PRCM_IDLEST 0x30000
+#define DPLL_CLKDCOLDO_GATE_CTRL 0x300
+
+/* Base address of musb wrapper */
+#define AM335X_USB_OTG_BASE 0x47401800
+
+/* Base address of musb core */
+#define AM335X_USB_OTG_CORE_BASE (AM335X_USB_OTG_BASE + 0x400)
+
+/* Timeout for AM35x usb module */
+#define AM335X_USB_OTG_TIMEOUT 0x3FFFFFF
+
+/*
+ * AM335x platform USB wrapper register overlay.
+ */
+struct am335x_usb_regs {
+ u32 revision; /* 0x00 */
+ u32 reserved0[4];
+ u32 ctrl; /* 0x14 */
+ u32 status; /* 0x18 */
+ u32 reserved1[1];
+ u32 irqmstat; /* 0x20 */
+ u32 irqeoi; /* 0x24 */
+ u32 irqstatraw0; /* 0x28 */
+ u32 irqstatraw1; /* 0x2c */
+ u32 irqstat0; /* 0x30 */
+ u32 irqstat1; /* 0x34 */
+ u32 irqenableset0; /* 0x38 */
+ u32 irqenableset1; /* 0x3c */
+ u32 irqenableclr0; /* 0x40 */
+ u32 irqenableclr1; /* 0x44 */
+ u32 reserved2[10];
+ u32 txmode; /* 0x70 */
+ u32 rxmode; /* 0x74 */
+ u32 reserved3[2];
+ u32 genrndisep1; /* 0x80 */
+ u32 genrndisep2; /* 0x84 */
+ u32 genrndisep3; /* 0x88 */
+ u32 genrndisep4; /* 0x8c */
+ u32 genrndisep5; /* 0x90 */
+ u32 genrndisep6; /* 0x94 */
+ u32 genrndisep7; /* 0x98 */
+ u32 genrndisep8; /* 0x9c */
+ u32 genrndisep9; /* 0xa0 */
+ u32 genrndisep10; /* 0xa4 */
+ u32 genrndisep11; /* 0xa8 */
+ u32 genrndisep12; /* 0xac */
+ u32 genrndisep13; /* 0xb0 */
+ u32 genrndisep14; /* 0xb4 */
+ u32 genrndisep15; /* 0xb8 */
+ u32 reserved4[5];
+ u32 autoreq; /* 0xd0 */
+ u32 srpfixtime; /* 0xd4 */
+ u32 tdown; /* 0xd8 */
+ u32 reserved5[1];
+ u32 utmi; /* 0xe0 */
+ u32 utmilb; /* 0xe4 */
+ u32 mode; /* 0xe8 */
+};
+
+#define am335x_usb_regs ((struct am335x_usb_regs *)AM335X_USB_OTG_BASE)
+
+/* USB 2.0 PHY Control */
+#define CM_PHY_PWRDN (1 << 0)
+#define CM_PHY_OTG_PWRDN (1 << 1)
+#define OTGVDET_EN (1 << 19)
+#define OTGSESSENDEN (1 << 20)
+
+/* USB CTRL REG FIELDS */
+#define SOFT_RESET_BIT (1 << 0)
+
+#endif /* __AM335X_USB_H__ */
diff --git a/include/usb.h b/include/usb.h
index 6da91e7..13f5434 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -141,7 +141,8 @@ struct usb_device {
defined(CONFIG_USB_SL811HS) || defined(CONFIG_USB_ISP116X_HCD) || \
defined(CONFIG_USB_R8A66597_HCD) || defined(CONFIG_USB_DAVINCI) || \
defined(CONFIG_USB_OMAP3) || defined(CONFIG_USB_DA8XX) || \
- defined(CONFIG_USB_BLACKFIN) || defined(CONFIG_USB_AM35X)
+ defined(CONFIG_USB_BLACKFIN) || defined(CONFIG_USB_AM35X) || \
+ defined(CONFIG_USB_AM335X)
int usb_lowlevel_init(void);
int usb_lowlevel_stop(void);
--
1.7.0.4
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