drivers/usb/host/ohci-da8xx.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2012 Sughosh Ganu <urwithsughosh@gmail.com>
   4  */
   5
   6 #include <common.h>
   7 #include <malloc.h>
   8 #include <asm/io.h>
   9 #include <clk.h>
  10 #include <dm.h>
  11 #include <dm/device_compat.h>
  12 #include <dm/devres.h>
  13 #include <dm/ofnode.h>
  14 #include <generic-phy.h>
  15 #include <reset.h>
  16 #include "ohci.h"
  17 #include <asm/arch/da8xx-usb.h>
  18
  19 struct da8xx_ohci {
  20         ohci_t ohci;
  21         struct clk *clocks;     /* clock list */
  22         struct phy phy;
  23         int clock_count;        /* number of clock in clock list */
  24 };
  25
  26 static int usb_phy_on(void)
  27 {
  28         unsigned long timeout;
  29
  30         clrsetbits_le32(&davinci_syscfg_regs->cfgchip2,
  31                         (CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN |
  32                         CFGCHIP2_OTGPWRDN | CFGCHIP2_OTGMODE |
  33                         CFGCHIP2_REFFREQ | CFGCHIP2_USB1PHYCLKMUX),
  34                         (CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN |
  35                         CFGCHIP2_PHY_PLLON | CFGCHIP2_REFFREQ_24MHZ |
  36                         CFGCHIP2_USB2PHYCLKMUX | CFGCHIP2_USB1SUSPENDM));
  37
  38         /* wait until the usb phy pll locks */
  39         timeout = get_timer(0);
  40         while (get_timer(timeout) < 10) {
  41                 if (readl(&davinci_syscfg_regs->cfgchip2) & CFGCHIP2_PHYCLKGD)
  42                         return 1;
  43         }
  44
  45         /* USB phy was not turned on */
  46         return 0;
  47 }
  48
  49 static void usb_phy_off(void)
  50 {
  51         /* Power down the on-chip PHY. */
  52         clrsetbits_le32(&davinci_syscfg_regs->cfgchip2,
  53                         CFGCHIP2_PHY_PLLON | CFGCHIP2_USB1SUSPENDM,
  54                         CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN |
  55                         CFGCHIP2_RESET);
  56 }
  57
  58 int usb_cpu_init(void)
  59 {
  60         /* enable psc for usb2.0 */
  61         lpsc_on(DAVINCI_LPSC_USB20);
  62
  63         /* enable psc for usb1.0 */
  64         lpsc_on(DAVINCI_LPSC_USB11);
  65
  66         /* start the on-chip usb phy and its pll */
  67         if (usb_phy_on())
  68                 return 0;
  69
  70         return 1;
  71 }
  72
  73 int usb_cpu_stop(void)
  74 {
  75         usb_phy_off();
  76
  77         /* turn off the usb clock and assert the module reset */
  78         lpsc_disable(DAVINCI_LPSC_USB11);
  79         lpsc_disable(DAVINCI_LPSC_USB20);
  80
  81         return 0;
  82 }
  83
  84 int usb_cpu_init_fail(void)
  85 {
  86         return usb_cpu_stop();
  87 }
  88
  89 #if CONFIG_IS_ENABLED(DM_USB)
  90 static int ohci_da8xx_probe(struct udevice *dev)
  91 {
  92         struct ohci_regs *regs = dev_read_addr_ptr(dev);
  93         struct da8xx_ohci *priv = dev_get_priv(dev);
  94         int i, err, ret, clock_nb;
  95
  96         err = 0;
  97         priv->clock_count = 0;
  98         clock_nb = dev_count_phandle_with_args(dev, "clocks", "#clock-cells",
  99                                                0);
 100
 101         if (clock_nb < 0)
 102                 return clock_nb;
 103
 104         if (clock_nb > 0) {
 105                 priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
 106                                             GFP_KERNEL);
 107                 if (!priv->clocks)
 108                         return -ENOMEM;
 109
 110                 for (i = 0; i < clock_nb; i++) {
 111                         err = clk_get_by_index(dev, i, &priv->clocks[i]);
 112                         if (err < 0)
 113                                 break;
 114
 115                         err = clk_enable(&priv->clocks[i]);
 116                         if (err) {
 117                                 dev_err(dev, "failed to enable clock %d\n", i);
 118                                 clk_free(&priv->clocks[i]);
 119                                 goto clk_err;
 120                         }
 121                         priv->clock_count++;
 122                 }
 123         }
 124
 125         err = usb_cpu_init();
 126
 127         if (err)
 128                 goto clk_err;
 129
 130         err = ohci_register(dev, regs);
 131         if (err)
 132                 goto phy_err;
 133
 134         return 0;
 135
 136 phy_err:
 137         ret = usb_cpu_stop();
 138         if (ret)
 139                 dev_err(dev, "failed to shutdown usb phy\n");
 140
 141 clk_err:
 142         ret = clk_release_all(priv->clocks, priv->clock_count);
 143         if (ret)
 144                 dev_err(dev, "failed to disable all clocks\n");
 145
 146         return err;
 147 }
 148
 149 static int ohci_da8xx_remove(struct udevice *dev)
 150 {
 151         struct da8xx_ohci *priv = dev_get_priv(dev);
 152         int ret;
 153
 154         ret = ohci_deregister(dev);
 155         if (ret)
 156                 return ret;
 157
 158         ret = usb_cpu_stop();
 159         if (ret)
 160                 return ret;
 161
 162         return clk_release_all(priv->clocks, priv->clock_count);
 163 }
 164
 165 static const struct udevice_id da8xx_ohci_ids[] = {
 166         { .compatible = "ti,da830-ohci" },
 167         { }
 168 };
 169
 170 U_BOOT_DRIVER(ohci_generic) = {
 171         .name   = "ohci-da8xx",
 172         .id     = UCLASS_USB,
 173         .of_match = da8xx_ohci_ids,
 174         .probe = ohci_da8xx_probe,
 175         .remove = ohci_da8xx_remove,
 176         .ops    = &ohci_usb_ops,
 177         .priv_auto      = sizeof(struct da8xx_ohci),
 178         .flags  = DM_FLAG_ALLOC_PRIV_DMA | DM_FLAG_OS_PREPARE,
 179 };
 180 #endif