drivers/usb/phy/omap_usb_phy.c

   1 /*
   2  * OMAP USB PHY Support
   3  *
   4  * (C) Copyright 2013
   5  * Texas Instruments, <www.ti.com>
   6  *
   7  * Author: Dan Murphy <dmurphy@ti.com>
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 #include <common.h>
  13 #include <usb.h>
  14 #include <asm-generic/errno.h>
  15 #include <asm/omap_common.h>
  16 #include <asm/arch/cpu.h>
  17 #include <asm/arch/sys_proto.h>
  18
  19 #include <linux/compat.h>
  20 #include <linux/usb/dwc3.h>
  21 #include <linux/usb/xhci-omap.h>
  22
  23 #include "../host/xhci.h"
  24
  25 #ifdef CONFIG_OMAP_USB3PHY1_HOST
  26 struct usb_dpll_params {
  27         u16     m;
  28         u8      n;
  29         u8      freq:3;
  30         u8      sd;
  31         u32     mf;
  32 };
  33
  34 #define NUM_USB_CLKS            6
  35
  36 static struct usb_dpll_params omap_usb3_dpll_params[NUM_USB_CLKS] = {
  37         {1250, 5, 4, 20, 0},            /* 12 MHz */
  38         {3125, 20, 4, 20, 0},           /* 16.8 MHz */
  39         {1172, 8, 4, 20, 65537},        /* 19.2 MHz */
  40         {1250, 12, 4, 20, 0},           /* 26 MHz */
  41         {3125, 47, 4, 20, 92843},       /* 38.4 MHz */
  42         {1000, 7, 4, 10, 0},        /* 20 MHz */
  43 };
  44
  45 static void omap_usb_dpll_relock(struct omap_usb3_phy *phy_regs)
  46 {
  47         u32 val;
  48
  49         writel(SET_PLL_GO, &phy_regs->pll_go);
  50         do {
  51                 val = readl(&phy_regs->pll_status);
  52                         if (val & PLL_LOCK)
  53                                 break;
  54         } while (1);
  55 }
  56
  57 static void omap_usb_dpll_lock(struct omap_usb3_phy *phy_regs)
  58 {
  59         u32 clk_index = get_sys_clk_index();
  60         u32 val;
  61
  62         val = readl(&phy_regs->pll_config_1);
  63         val &= ~PLL_REGN_MASK;
  64         val |= omap_usb3_dpll_params[clk_index].n << PLL_REGN_SHIFT;
  65         writel(val, &phy_regs->pll_config_1);
  66
  67         val = readl(&phy_regs->pll_config_2);
  68         val &= ~PLL_SELFREQDCO_MASK;
  69         val |= omap_usb3_dpll_params[clk_index].freq << PLL_SELFREQDCO_SHIFT;
  70         writel(val, &phy_regs->pll_config_2);
  71
  72         val = readl(&phy_regs->pll_config_1);
  73         val &= ~PLL_REGM_MASK;
  74         val |= omap_usb3_dpll_params[clk_index].m << PLL_REGM_SHIFT;
  75         writel(val, &phy_regs->pll_config_1);
  76
  77         val = readl(&phy_regs->pll_config_4);
  78         val &= ~PLL_REGM_F_MASK;
  79         val |= omap_usb3_dpll_params[clk_index].mf << PLL_REGM_F_SHIFT;
  80         writel(val, &phy_regs->pll_config_4);
  81
  82         val = readl(&phy_regs->pll_config_3);
  83         val &= ~PLL_SD_MASK;
  84         val |= omap_usb3_dpll_params[clk_index].sd << PLL_SD_SHIFT;
  85         writel(val, &phy_regs->pll_config_3);
  86
  87         omap_usb_dpll_relock(phy_regs);
  88 }
  89
  90 static void usb3_phy_partial_powerup(struct omap_usb3_phy *phy_regs)
  91 {
  92         u32 rate = get_sys_clk_freq()/1000000;
  93         u32 val;
  94
  95         val = readl((*ctrl)->control_phy_power_usb);
  96         val &= ~(USB3_PWRCTL_CLK_CMD_MASK | USB3_PWRCTL_CLK_FREQ_MASK);
  97         val |= (USB3_PHY_PARTIAL_RX_POWERON | USB3_PHY_TX_RX_POWERON);
  98         val |= rate << USB3_PWRCTL_CLK_FREQ_SHIFT;
  99
 100         writel(val, (*ctrl)->control_phy_power_usb);
 101 }
 102
 103 void usb_phy_power(int on)
 104 {
 105         u32 val;
 106
 107         val = readl((*ctrl)->control_phy_power_usb);
 108         if (on) {
 109                 val &= ~USB3_PWRCTL_CLK_CMD_MASK;
 110                 val |= USB3_PHY_TX_RX_POWERON;
 111         } else {
 112                 val &= (~USB3_PWRCTL_CLK_CMD_MASK & ~USB3_PHY_TX_RX_POWERON);
 113         }
 114
 115         writel(val, (*ctrl)->control_phy_power_usb);
 116 }
 117
 118 void omap_usb3_phy_init(struct omap_usb3_phy *phy_regs)
 119 {
 120         omap_usb_dpll_lock(phy_regs);
 121         usb3_phy_partial_powerup(phy_regs);
 122         /*
 123          * Give enough time for the PHY to partially power-up before
 124          * powering it up completely. delay value suggested by the HW
 125          * team.
 126          */
 127         mdelay(100);
 128 }
 129
 130 static void omap_enable_usb3_phy(struct omap_xhci *omap)
 131 {
 132         u32     val;
 133
 134         val = (USBOTGSS_DMADISABLE |
 135                         USBOTGSS_STANDBYMODE_SMRT_WKUP |
 136                         USBOTGSS_IDLEMODE_NOIDLE);
 137         writel(val, &omap->otg_wrapper->sysconfig);
 138
 139         /* Clear the utmi OTG status */
 140         val = readl(&omap->otg_wrapper->utmi_otg_status);
 141         writel(val, &omap->otg_wrapper->utmi_otg_status);
 142
 143         /* Enable interrupts */
 144         writel(USBOTGSS_COREIRQ_EN, &omap->otg_wrapper->irqenable_set_0);
 145         val = (USBOTGSS_IRQ_SET_1_IDPULLUP_FALL_EN |
 146                         USBOTGSS_IRQ_SET_1_DISCHRGVBUS_FALL_EN |
 147                         USBOTGSS_IRQ_SET_1_CHRGVBUS_FALL_EN     |
 148                         USBOTGSS_IRQ_SET_1_DRVVBUS_FALL_EN      |
 149                         USBOTGSS_IRQ_SET_1_IDPULLUP_RISE_EN     |
 150                         USBOTGSS_IRQ_SET_1_DISCHRGVBUS_RISE_EN  |
 151                         USBOTGSS_IRQ_SET_1_CHRGVBUS_RISE_EN |
 152                         USBOTGSS_IRQ_SET_1_DRVVBUS_RISE_EN |
 153                         USBOTGSS_IRQ_SET_1_OEVT_EN);
 154         writel(val, &omap->otg_wrapper->irqenable_set_1);
 155
 156         /* Clear the IRQ status */
 157         val = readl(&omap->otg_wrapper->irqstatus_1);
 158         writel(val, &omap->otg_wrapper->irqstatus_1);
 159         val = readl(&omap->otg_wrapper->irqstatus_0);
 160         writel(val, &omap->otg_wrapper->irqstatus_0);
 161 };
 162 #endif /* CONFIG_OMAP_USB3PHY1_HOST */
 163
 164 #ifdef CONFIG_OMAP_USB2PHY2_HOST
 165 static void omap_enable_usb2_phy2(struct omap_xhci *omap)
 166 {
 167         u32 reg, val;
 168
 169         val = (~USB2PHY_AUTORESUME_EN & USB2PHY_DISCHGDET);
 170         writel(val, (*ctrl)->control_srcomp_north_side);
 171
 172         setbits_le32((*prcm)->cm_coreaon_usb_phy2_core_clkctrl,
 173                         USBPHY_CORE_CLKCTRL_OPTFCLKEN_CLK32K);
 174
 175         setbits_le32((*prcm)->cm_l3init_hsusbhost_clkctrl,
 176                                         (USBPHY_CORE_CLKCTRL_OPTFCLKEN_CLK32K |
 177                                          OTG_SS_CLKCTRL_MODULEMODE_HW));
 178
 179         /* This is an undocumented Reserved register */
 180         reg = 0x4a0086c0;
 181         val = readl(reg);
 182         val |= 0x100;
 183         setbits_le32(reg, val);
 184 }
 185
 186 void usb_phy_power(int on)
 187 {
 188         return;
 189 }
 190 #endif /* CONFIG_OMAP_USB2PHY2_HOST */
 191
 192 #ifdef CONFIG_AM437X_USB2PHY2_HOST
 193 static void am437x_enable_usb2_phy2(struct omap_xhci *omap)
 194 {
 195         const u32 usb_otg_ss_clk_val = (USBOTGSSX_CLKCTRL_MODULE_EN |
 196                                 USBOTGSSX_CLKCTRL_OPTFCLKEN_REFCLK960);
 197
 198         writel(usb_otg_ss_clk_val, PRM_PER_USB_OTG_SS0_CLKCTRL);
 199         writel(usb_otg_ss_clk_val, PRM_PER_USB_OTG_SS1_CLKCTRL);
 200
 201         writel(USBPHYOCPSCP_MODULE_EN, PRM_PER_USBPHYOCP2SCP0_CLKCTRL);
 202         writel(USBPHYOCPSCP_MODULE_EN, PRM_PER_USBPHYOCP2SCP1_CLKCTRL);
 203 }
 204
 205 void usb_phy_power(int on)
 206 {
 207         u32 val;
 208
 209         /* USB1_CTRL */
 210         val = readl(USB1_CTRL);
 211         if (on) {
 212                 /*
 213                  * these bits are re-used on AM437x to power up/down the USB
 214                  * CM and OTG PHYs, if we don't toggle them, USB will not be
 215                  * functional on newer silicon revisions
 216                  */
 217                 val &= ~(USB1_CTRL_CM_PWRDN | USB1_CTRL_OTG_PWRDN);
 218         } else {
 219                 val |= USB1_CTRL_CM_PWRDN | USB1_CTRL_OTG_PWRDN;
 220         }
 221
 222         writel(val, USB1_CTRL);
 223 }
 224 #endif /* CONFIG_AM437X_USB2PHY2_HOST */
 225
 226 void omap_reset_usb_phy(struct dwc3 *dwc3_reg)
 227 {
 228         /* Assert USB3 PHY reset */
 229         setbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
 230
 231         /* Assert USB2 PHY reset */
 232         setbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
 233
 234         mdelay(100);
 235
 236         /* Clear USB3 PHY reset */
 237         clrbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
 238
 239         /* Clear USB2 PHY reset */
 240         clrbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
 241
 242 }
 243
 244 void omap_enable_phy(struct omap_xhci *omap)
 245 {
 246 #ifdef CONFIG_OMAP_USB2PHY2_HOST
 247         omap_enable_usb2_phy2(omap);
 248 #endif
 249
 250 #ifdef CONFIG_AM437X_USB2PHY2_HOST
 251         am437x_enable_usb2_phy2(omap);
 252 #endif
 253
 254 #ifdef CONFIG_OMAP_USB3PHY1_HOST
 255         omap_enable_usb3_phy(omap);
 256         omap_usb3_phy_init(omap->usb3_phy);
 257 #endif
 258 }