drivers/usb/musb/da8xx.c

   1 /*
   2  * da8xx.c - TI's DA8xx platform specific usb wrapper functions.
   3  *
   4  * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
   5  *
   6  * Based on drivers/usb/musb/davinci.c
   7  *
   8  * Copyright (C) 2009 Texas Instruments Incorporated
   9  *
  10  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12 #include <common.h>
  13
  14 #include "musb_core.h"
  15 #include <asm/arch/da8xx-usb.h>
  16
  17 /* MUSB platform configuration */
  18 struct musb_config musb_cfg = {
  19         .regs           = (struct musb_regs *)DA8XX_USB_OTG_CORE_BASE,
  20         .timeout        = DA8XX_USB_OTG_TIMEOUT,
  21         .musb_speed     = 0,
  22 };
  23
  24 /*
  25  * This function enables VBUS by driving the GPIO Bank4 Pin 15 high.
  26  */
  27 static void enable_vbus(void)
  28 {
  29         u32 value;
  30
  31         /* configure GPIO bank4 pin 15 in output direction */
  32         value = readl(&davinci_gpio_bank45->dir);
  33         writel((value & (~DA8XX_USB_VBUS_GPIO)), &davinci_gpio_bank45->dir);
  34
  35         /* set GPIO bank4 pin 15 high to drive VBUS */
  36         value = readl(&davinci_gpio_bank45->set_data);
  37         writel((value | DA8XX_USB_VBUS_GPIO), &davinci_gpio_bank45->set_data);
  38 }
  39
  40 /*
  41  * Enable the usb0 phy. This initialization procedure is explained in
  42  * the DA8xx USB user guide document.
  43  */
  44 static u8 phy_on(void)
  45 {
  46         u32 timeout;
  47         u32 cfgchip2;
  48
  49         cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
  50
  51         cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN |
  52                       CFGCHIP2_OTGMODE | CFGCHIP2_REFFREQ);
  53         cfgchip2 |= CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN | CFGCHIP2_PHY_PLLON |
  54                     CFGCHIP2_REFFREQ_24MHZ;
  55
  56         writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
  57
  58         /* wait until the usb phy pll locks */
  59         timeout = musb_cfg.timeout;
  60         while (timeout--)
  61                 if (readl(&davinci_syscfg_regs->cfgchip2) & CFGCHIP2_PHYCLKGD)
  62                         return 1;
  63
  64         /* USB phy was not turned on */
  65         return 0;
  66 }
  67
  68 /*
  69  * Disable the usb phy
  70  */
  71 static void phy_off(void)
  72 {
  73         u32 cfgchip2;
  74
  75         /*
  76          * Power down the on-chip PHY.
  77          */
  78         cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
  79         cfgchip2 &= ~CFGCHIP2_PHY_PLLON;
  80         cfgchip2 |= CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN;
  81         writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
  82 }
  83
  84 /*
  85  * This function performs DA8xx platform specific initialization for usb0.
  86  */
  87 int musb_platform_init(void)
  88 {
  89         u32  revision;
  90
  91         /* enable psc for usb2.0 */
  92         lpsc_on(33);
  93
  94         /* enable usb vbus */
  95         enable_vbus();
  96
  97         /* reset the controller */
  98         writel(0x1, &da8xx_usb_regs->control);
  99         udelay(5000);
 100
 101         /* start the on-chip usb phy and its pll */
 102         if (phy_on() == 0)
 103                 return -1;
 104
 105         /* Returns zero if e.g. not clocked */
 106         revision = readl(&da8xx_usb_regs->revision);
 107         if (revision == 0)
 108                 return -1;
 109
 110         /* Disable all interrupts */
 111         writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
 112                 DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_set);
 113         return 0;
 114 }
 115
 116 /*
 117  * This function performs DA8xx platform specific deinitialization for usb0.
 118  */
 119 void musb_platform_deinit(void)
 120 {
 121         /* Turn of the phy */
 122         phy_off();
 123
 124         /* flush any interrupts */
 125         writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
 126                 DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr);
 127         writel(0, &da8xx_usb_regs->eoi);
 128 }