arch/arm/mach-omap2/omap_phy_internal.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3   * This file configures the internal USB PHY in OMAP4430. Used
   4   * with TWL6030 transceiver and MUSB on OMAP4430.
   5   *
   6   * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com
   7   * Author: Hema HK <hemahk@ti.com>
   8   */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/types.h>
  13 #include <linux/delay.h>
  14 #include <linux/clk.h>
  15 #include <linux/io.h>
  16 #include <linux/err.h>
  17 #include <linux/usb.h>
  18 #include <linux/usb/musb.h>
  19
  20 #include "soc.h"
  21 #include "control.h"
  22 #include "usb.h"
  23
  24 #define CONTROL_DEV_CONF                0x300
  25 #define PHY_PD                          0x1
  26
  27 /**
  28  * omap4430_phy_power_down: disable MUSB PHY during early init
  29  *
  30  * OMAP4 MUSB PHY module is enabled by default on reset, but this will
  31  * prevent core retention if not disabled by SW. USB driver will
  32  * later on enable this, once and if the driver needs it.
  33  */
  34 static int __init omap4430_phy_power_down(void)
  35 {
  36         void __iomem *ctrl_base;
  37
  38         if (!cpu_is_omap44xx())
  39                 return 0;
  40
  41         ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K);
  42         if (!ctrl_base) {
  43                 pr_err("control module ioremap failed\n");
  44                 return -ENOMEM;
  45         }
  46
  47         /* Power down the phy */
  48         writel_relaxed(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
  49
  50         iounmap(ctrl_base);
  51
  52         return 0;
  53 }
  54 omap_early_initcall(omap4430_phy_power_down);
  55
  56 void am35x_musb_reset(void)
  57 {
  58         u32     regval;
  59
  60         /* Reset the musb interface */
  61         regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
  62
  63         regval |= AM35XX_USBOTGSS_SW_RST;
  64         omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
  65
  66         regval &= ~AM35XX_USBOTGSS_SW_RST;
  67         omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
  68
  69         regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
  70 }
  71
  72 void am35x_musb_phy_power(u8 on)
  73 {
  74         unsigned long timeout = jiffies + msecs_to_jiffies(100);
  75         u32 devconf2;
  76
  77         if (on) {
  78                 /*
  79                  * Start the on-chip PHY and its PLL.
  80                  */
  81                 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
  82
  83                 devconf2 &= ~(CONF2_RESET | CONF2_PHYPWRDN | CONF2_OTGPWRDN);
  84                 devconf2 |= CONF2_PHY_PLLON;
  85
  86                 omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
  87
  88                 pr_info("Waiting for PHY clock good...\n");
  89                 while (!(omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2)
  90                                 & CONF2_PHYCLKGD)) {
  91                         cpu_relax();
  92
  93                         if (time_after(jiffies, timeout)) {
  94                                 pr_err("musb PHY clock good timed out\n");
  95                                 break;
  96                         }
  97                 }
  98         } else {
  99                 /*
 100                  * Power down the on-chip PHY.
 101                  */
 102                 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
 103
 104                 devconf2 &= ~CONF2_PHY_PLLON;
 105                 devconf2 |=  CONF2_PHYPWRDN | CONF2_OTGPWRDN;
 106                 omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
 107         }
 108 }
 109
 110 void am35x_musb_clear_irq(void)
 111 {
 112         u32 regval;
 113
 114         regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
 115         regval |= AM35XX_USBOTGSS_INT_CLR;
 116         omap_ctrl_writel(regval, AM35XX_CONTROL_LVL_INTR_CLEAR);
 117         regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
 118 }
 119
 120 void am35x_set_mode(u8 musb_mode)
 121 {
 122         u32 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
 123
 124         devconf2 &= ~CONF2_OTGMODE;
 125         switch (musb_mode) {
 126         case MUSB_HOST:         /* Force VBUS valid, ID = 0 */
 127                 devconf2 |= CONF2_FORCE_HOST;
 128                 break;
 129         case MUSB_PERIPHERAL:   /* Force VBUS valid, ID = 1 */
 130                 devconf2 |= CONF2_FORCE_DEVICE;
 131                 break;
 132         case MUSB_OTG:          /* Don't override the VBUS/ID comparators */
 133                 devconf2 |= CONF2_NO_OVERRIDE;
 134                 break;
 135         default:
 136                 pr_info("Unsupported mode %u\n", musb_mode);
 137         }
 138
 139         omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
 140 }