arch/arm/mach-omap2/omap_phy_internal.c

   1 /*
   2   * This file configures the internal USB PHY in OMAP4430. Used
   3   * with TWL6030 transceiver and MUSB on OMAP4430.
   4   *
   5   * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
   6   * This program is free software; you can redistribute it and/or modify
   7   * it under the terms of the GNU General Public License as published by
   8   * the Free Software Foundation; either version 2 of the License, or
   9   * (at your option) any later version.
  10   *
  11   * Author: Hema HK <hemahk@ti.com>
  12   *
  13   * This program is distributed in the hope that it will be useful,
  14   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   * GNU General Public License for more details.
  17   *
  18   * You should have received a copy of the GNU General Public License
  19   * along with this program; if not, write to the Free Software
  20   * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21   *
  22   */
  23
  24 #include <linux/types.h>
  25 #include <linux/delay.h>
  26 #include <linux/clk.h>
  27 #include <linux/io.h>
  28 #include <linux/err.h>
  29 #include <linux/usb.h>
  30 #include <linux/usb/musb.h>
  31
  32 #include "soc.h"
  33 #include "control.h"
  34 #include "usb.h"
  35
  36 #define CONTROL_DEV_CONF                0x300
  37 #define PHY_PD                          0x1
  38
  39 /**
  40  * omap4430_phy_power_down: disable MUSB PHY during early init
  41  *
  42  * OMAP4 MUSB PHY module is enabled by default on reset, but this will
  43  * prevent core retention if not disabled by SW. USB driver will
  44  * later on enable this, once and if the driver needs it.
  45  */
  46 static int __init omap4430_phy_power_down(void)
  47 {
  48         void __iomem *ctrl_base;
  49
  50         if (!cpu_is_omap44xx())
  51                 return 0;
  52
  53         ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K);
  54         if (!ctrl_base) {
  55                 pr_err("control module ioremap failed\n");
  56                 return -ENOMEM;
  57         }
  58
  59         /* Power down the phy */
  60         writel_relaxed(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
  61
  62         iounmap(ctrl_base);
  63
  64         return 0;
  65 }
  66 omap_early_initcall(omap4430_phy_power_down);
  67
  68 void am35x_musb_reset(void)
  69 {
  70         u32     regval;
  71
  72         /* Reset the musb interface */
  73         regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
  74
  75         regval |= AM35XX_USBOTGSS_SW_RST;
  76         omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
  77
  78         regval &= ~AM35XX_USBOTGSS_SW_RST;
  79         omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
  80
  81         regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
  82 }
  83
  84 void am35x_musb_phy_power(u8 on)
  85 {
  86         unsigned long timeout = jiffies + msecs_to_jiffies(100);
  87         u32 devconf2;
  88
  89         if (on) {
  90                 /*
  91                  * Start the on-chip PHY and its PLL.
  92                  */
  93                 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
  94
  95                 devconf2 &= ~(CONF2_RESET | CONF2_PHYPWRDN | CONF2_OTGPWRDN);
  96                 devconf2 |= CONF2_PHY_PLLON;
  97
  98                 omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
  99
 100                 pr_info(KERN_INFO "Waiting for PHY clock good...\n");
 101                 while (!(omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2)
 102                                 & CONF2_PHYCLKGD)) {
 103                         cpu_relax();
 104
 105                         if (time_after(jiffies, timeout)) {
 106                                 pr_err(KERN_ERR "musb PHY clock good timed out\n");
 107                                 break;
 108                         }
 109                 }
 110         } else {
 111                 /*
 112                  * Power down the on-chip PHY.
 113                  */
 114                 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
 115
 116                 devconf2 &= ~CONF2_PHY_PLLON;
 117                 devconf2 |=  CONF2_PHYPWRDN | CONF2_OTGPWRDN;
 118                 omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
 119         }
 120 }
 121
 122 void am35x_musb_clear_irq(void)
 123 {
 124         u32 regval;
 125
 126         regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
 127         regval |= AM35XX_USBOTGSS_INT_CLR;
 128         omap_ctrl_writel(regval, AM35XX_CONTROL_LVL_INTR_CLEAR);
 129         regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
 130 }
 131
 132 void am35x_set_mode(u8 musb_mode)
 133 {
 134         u32 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
 135
 136         devconf2 &= ~CONF2_OTGMODE;
 137         switch (musb_mode) {
 138         case MUSB_HOST:         /* Force VBUS valid, ID = 0 */
 139                 devconf2 |= CONF2_FORCE_HOST;
 140                 break;
 141         case MUSB_PERIPHERAL:   /* Force VBUS valid, ID = 1 */
 142                 devconf2 |= CONF2_FORCE_DEVICE;
 143                 break;
 144         case MUSB_OTG:          /* Don't override the VBUS/ID comparators */
 145                 devconf2 |= CONF2_NO_OVERRIDE;
 146                 break;
 147         default:
 148                 pr_info(KERN_INFO "Unsupported mode %u\n", musb_mode);
 149         }
 150
 151         omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
 152 }
 153
 154 void ti81xx_musb_phy_power(u8 on)
 155 {
 156         void __iomem *scm_base = NULL;
 157         u32 usbphycfg;
 158
 159         scm_base = ioremap(TI81XX_SCM_BASE, SZ_2K);
 160         if (!scm_base) {
 161                 pr_err("system control module ioremap failed\n");
 162                 return;
 163         }
 164
 165         usbphycfg = readl_relaxed(scm_base + USBCTRL0);
 166
 167         if (on) {
 168                 if (cpu_is_ti816x()) {
 169                         usbphycfg |= TI816X_USBPHY0_NORMAL_MODE;
 170                         usbphycfg &= ~TI816X_USBPHY_REFCLK_OSC;
 171                 } else if (cpu_is_ti814x()) {
 172                         usbphycfg &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN
 173                                 | USBPHY_DPINPUT | USBPHY_DMINPUT);
 174                         usbphycfg |= (USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN
 175                                 | USBPHY_DPOPBUFCTL | USBPHY_DMOPBUFCTL);
 176                 }
 177         } else {
 178                 if (cpu_is_ti816x())
 179                         usbphycfg &= ~TI816X_USBPHY0_NORMAL_MODE;
 180                 else if (cpu_is_ti814x())
 181                         usbphycfg |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
 182
 183         }
 184         writel_relaxed(usbphycfg, scm_base + USBCTRL0);
 185
 186         iounmap(scm_base);
 187 }