From: Gene Zarkhin gene_zarkhin@bose.com
This patch 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.
Signed-off-by: Gene Zarkhin gene_zarkhin@bose.com Signed-off-by: Harman Sohanpal harman_sohanpal@ti.com --- 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@bose.com + * Modified by: Harman Sohanpal harman_sohanpal@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@bose.com + * Modified by: Harman Sohanpal harman_sohanpal@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);