Tom Rini | 10e4779 | 2018-05-06 17:58:06 -0400 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Ajay Kumar Gupta | 0882f3e | 2009-12-22 10:56:13 +0530 | [diff] [blame] | 2 | /* |
| 3 | * da8xx.c - TI's DA8xx platform specific usb wrapper functions. |
| 4 | * |
| 5 | * Author: Ajay Kumar Gupta <ajay.gupta@ti.com> |
| 6 | * |
| 7 | * Based on drivers/usb/musb/davinci.c |
| 8 | * |
| 9 | * Copyright (C) 2009 Texas Instruments Incorporated |
Ajay Kumar Gupta | 0882f3e | 2009-12-22 10:56:13 +0530 | [diff] [blame] | 10 | */ |
| 11 | #include <common.h> |
| 12 | |
Sughosh Ganu | 282e2af | 2012-08-09 10:45:20 +0000 | [diff] [blame] | 13 | #include "musb_core.h" |
| 14 | #include <asm/arch/da8xx-usb.h> |
Ajay Kumar Gupta | 0882f3e | 2009-12-22 10:56:13 +0530 | [diff] [blame] | 15 | |
| 16 | /* MUSB platform configuration */ |
| 17 | struct musb_config musb_cfg = { |
Ajay Kumar Gupta | 7e71dc7 | 2010-06-10 11:20:47 +0530 | [diff] [blame] | 18 | .regs = (struct musb_regs *)DA8XX_USB_OTG_CORE_BASE, |
| 19 | .timeout = DA8XX_USB_OTG_TIMEOUT, |
| 20 | .musb_speed = 0, |
Ajay Kumar Gupta | 0882f3e | 2009-12-22 10:56:13 +0530 | [diff] [blame] | 21 | }; |
| 22 | |
| 23 | /* |
| 24 | * This function enables VBUS by driving the GPIO Bank4 Pin 15 high. |
| 25 | */ |
| 26 | static void enable_vbus(void) |
| 27 | { |
| 28 | u32 value; |
| 29 | |
| 30 | /* configure GPIO bank4 pin 15 in output direction */ |
| 31 | value = readl(&davinci_gpio_bank45->dir); |
| 32 | writel((value & (~DA8XX_USB_VBUS_GPIO)), &davinci_gpio_bank45->dir); |
| 33 | |
| 34 | /* set GPIO bank4 pin 15 high to drive VBUS */ |
| 35 | value = readl(&davinci_gpio_bank45->set_data); |
| 36 | writel((value | DA8XX_USB_VBUS_GPIO), &davinci_gpio_bank45->set_data); |
| 37 | } |
| 38 | |
| 39 | /* |
| 40 | * Enable the usb0 phy. This initialization procedure is explained in |
| 41 | * the DA8xx USB user guide document. |
| 42 | */ |
| 43 | static u8 phy_on(void) |
| 44 | { |
| 45 | u32 timeout; |
| 46 | u32 cfgchip2; |
| 47 | |
| 48 | cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2); |
| 49 | |
| 50 | cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN | |
| 51 | CFGCHIP2_OTGMODE | CFGCHIP2_REFFREQ); |
| 52 | cfgchip2 |= CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN | CFGCHIP2_PHY_PLLON | |
| 53 | CFGCHIP2_REFFREQ_24MHZ; |
| 54 | |
| 55 | writel(cfgchip2, &davinci_syscfg_regs->cfgchip2); |
| 56 | |
| 57 | /* wait until the usb phy pll locks */ |
| 58 | timeout = musb_cfg.timeout; |
| 59 | while (timeout--) |
| 60 | if (readl(&davinci_syscfg_regs->cfgchip2) & CFGCHIP2_PHYCLKGD) |
| 61 | return 1; |
| 62 | |
| 63 | /* USB phy was not turned on */ |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | /* |
| 68 | * Disable the usb phy |
| 69 | */ |
| 70 | static void phy_off(void) |
| 71 | { |
| 72 | u32 cfgchip2; |
| 73 | |
| 74 | /* |
| 75 | * Power down the on-chip PHY. |
| 76 | */ |
| 77 | cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2); |
| 78 | cfgchip2 &= ~CFGCHIP2_PHY_PLLON; |
| 79 | cfgchip2 |= CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN; |
| 80 | writel(cfgchip2, &davinci_syscfg_regs->cfgchip2); |
| 81 | } |
| 82 | |
| 83 | /* |
| 84 | * This function performs DA8xx platform specific initialization for usb0. |
| 85 | */ |
| 86 | int musb_platform_init(void) |
| 87 | { |
| 88 | u32 revision; |
| 89 | |
| 90 | /* enable psc for usb2.0 */ |
| 91 | lpsc_on(33); |
| 92 | |
| 93 | /* enable usb vbus */ |
| 94 | enable_vbus(); |
| 95 | |
| 96 | /* reset the controller */ |
| 97 | writel(0x1, &da8xx_usb_regs->control); |
| 98 | udelay(5000); |
| 99 | |
| 100 | /* start the on-chip usb phy and its pll */ |
| 101 | if (phy_on() == 0) |
| 102 | return -1; |
| 103 | |
| 104 | /* Returns zero if e.g. not clocked */ |
| 105 | revision = readl(&da8xx_usb_regs->revision); |
| 106 | if (revision == 0) |
| 107 | return -1; |
| 108 | |
| 109 | /* Disable all interrupts */ |
| 110 | writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK | |
| 111 | DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_set); |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | /* |
| 116 | * This function performs DA8xx platform specific deinitialization for usb0. |
| 117 | */ |
| 118 | void musb_platform_deinit(void) |
| 119 | { |
| 120 | /* Turn of the phy */ |
| 121 | phy_off(); |
| 122 | |
| 123 | /* flush any interrupts */ |
| 124 | writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK | |
| 125 | DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr); |
| 126 | writel(0, &da8xx_usb_regs->eoi); |
| 127 | } |