drivers/phy/phy-da8xx-usb.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Based on the DA8xx "glue layer" code.
   4  * Copyright (c) 2008-2019, MontaVista Software, Inc. <source@mvista.com>
   5  *
   6  * DT support added by: Adam Ford <aford173@gmail.com>
   7  */
   8
   9 #include <common.h>
  10 #include <dm.h>
  11 #include <log.h>
  12 #include <dm/device-internal.h>
  13 #include <dm/lists.h>
  14 #include <asm/arch/hardware.h>
  15 #include <asm/arch/da8xx-usb.h>
  16 #include <asm/io.h>
  17 #include <generic-phy.h>
  18
  19 static int da8xx_usb_phy_power_on(struct phy *phy)
  20 {
  21         unsigned long timeout;
  22
  23         clrsetbits_le32(&davinci_syscfg_regs->cfgchip2,
  24                         CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN |
  25                         CFGCHIP2_OTGMODE | CFGCHIP2_REFFREQ,
  26                         CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN |
  27                         CFGCHIP2_PHY_PLLON | CFGCHIP2_REFFREQ_24MHZ);
  28
  29         /* wait until the usb phy pll locks */
  30         timeout = get_timer(0);
  31         while (get_timer(timeout) < 10) {
  32                 if (readl(&davinci_syscfg_regs->cfgchip2) & CFGCHIP2_PHYCLKGD)
  33                         return 0;
  34         }
  35
  36         debug("Phy was not turned on\n");
  37
  38         return -ENODEV;
  39 }
  40
  41 static int da8xx_usb_phy_power_off(struct phy *phy)
  42 {
  43         clrsetbits_le32(&davinci_syscfg_regs->cfgchip2,
  44                         CFGCHIP2_PHY_PLLON,
  45                         CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN);
  46
  47         return 0;
  48 }
  49
  50 static const struct udevice_id da8xx_phy_ids[] = {
  51         { .compatible = "ti,da830-usb-phy" },
  52         { }
  53 };
  54
  55 static struct phy_ops da8xx_phy_ops = {
  56         .power_on = da8xx_usb_phy_power_on,
  57         .power_off = da8xx_usb_phy_power_off,
  58 };
  59
  60 U_BOOT_DRIVER(da8xx_phy) = {
  61         .name   = "da8xx-usb-phy",
  62         .id     = UCLASS_PHY,
  63         .of_match = da8xx_phy_ids,
  64         .ops = &da8xx_phy_ops,
  65 };