1 /* 2 * Copyright (C) 2015 Alexey Brodkin <abrodkin@synopsys.com> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <clk.h> 9 #include <dm/ofnode.h> 10 #include <generic-phy.h> 11 #include <reset.h> 12 #include <asm/io.h> 13 #include <dm.h> 14 #include "ehci.h" 15 16 /* 17 * Even though here we don't explicitly use "struct ehci_ctrl" 18 * ehci_register() expects it to be the first thing that resides in 19 * device's private data. 20 */ 21 struct generic_ehci { 22 struct ehci_ctrl ctrl; 23 struct clk *clocks; 24 struct reset_ctl *resets; 25 struct phy phy; 26 int clock_count; 27 int reset_count; 28 }; 29 30 static int ehci_usb_probe(struct udevice *dev) 31 { 32 struct generic_ehci *priv = dev_get_priv(dev); 33 struct ehci_hccr *hccr; 34 struct ehci_hcor *hcor; 35 int i, err, ret, clock_nb, reset_nb; 36 37 err = 0; 38 priv->clock_count = 0; 39 clock_nb = ofnode_count_phandle_with_args(dev_ofnode(dev), "clocks", 40 "#clock-cells"); 41 if (clock_nb > 0) { 42 priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk), 43 GFP_KERNEL); 44 if (!priv->clocks) 45 return -ENOMEM; 46 47 for (i = 0; i < clock_nb; i++) { 48 err = clk_get_by_index(dev, i, &priv->clocks[i]); 49 50 if (err < 0) 51 break; 52 err = clk_enable(&priv->clocks[i]); 53 if (err) { 54 dev_err(dev, "failed to enable clock %d\n", i); 55 clk_free(&priv->clocks[i]); 56 goto clk_err; 57 } 58 priv->clock_count++; 59 } 60 } else { 61 if (clock_nb != -ENOENT) { 62 dev_err(dev, "failed to get clock phandle(%d)\n", 63 clock_nb); 64 return clock_nb; 65 } 66 } 67 68 priv->reset_count = 0; 69 reset_nb = ofnode_count_phandle_with_args(dev_ofnode(dev), "resets", 70 "#reset-cells"); 71 if (reset_nb > 0) { 72 priv->resets = devm_kcalloc(dev, reset_nb, 73 sizeof(struct reset_ctl), 74 GFP_KERNEL); 75 if (!priv->resets) 76 return -ENOMEM; 77 78 for (i = 0; i < reset_nb; i++) { 79 err = reset_get_by_index(dev, i, &priv->resets[i]); 80 if (err < 0) 81 break; 82 83 if (reset_deassert(&priv->resets[i])) { 84 dev_err(dev, "failed to deassert reset %d\n", 85 i); 86 reset_free(&priv->resets[i]); 87 goto reset_err; 88 } 89 priv->reset_count++; 90 } 91 } else { 92 if (reset_nb != -ENOENT) { 93 dev_err(dev, "failed to get reset phandle(%d)\n", 94 reset_nb); 95 goto clk_err; 96 } 97 } 98 99 err = ehci_setup_phy(dev, &priv->phy, 0); 100 if (err) 101 goto reset_err; 102 103 hccr = map_physmem(dev_read_addr(dev), 0x100, MAP_NOCACHE); 104 hcor = (struct ehci_hcor *)((uintptr_t)hccr + 105 HC_LENGTH(ehci_readl(&hccr->cr_capbase))); 106 107 err = ehci_register(dev, hccr, hcor, NULL, 0, USB_INIT_HOST); 108 if (err) 109 goto phy_err; 110 111 return 0; 112 113 phy_err: 114 ret = ehci_shutdown_phy(dev, &priv->phy); 115 if (ret) 116 dev_err(dev, "failed to shutdown usb phy\n"); 117 118 reset_err: 119 ret = reset_release_all(priv->resets, priv->reset_count); 120 if (ret) 121 dev_err(dev, "failed to assert all resets\n"); 122 clk_err: 123 ret = clk_release_all(priv->clocks, priv->clock_count); 124 if (ret) 125 dev_err(dev, "failed to disable all clocks\n"); 126 127 return err; 128 } 129 130 static int ehci_usb_remove(struct udevice *dev) 131 { 132 struct generic_ehci *priv = dev_get_priv(dev); 133 int ret; 134 135 ret = ehci_deregister(dev); 136 if (ret) 137 return ret; 138 139 ret = ehci_shutdown_phy(dev, &priv->phy); 140 if (ret) 141 return ret; 142 143 ret = reset_release_all(priv->resets, priv->reset_count); 144 if (ret) 145 return ret; 146 147 return clk_release_all(priv->clocks, priv->clock_count); 148 } 149 150 static const struct udevice_id ehci_usb_ids[] = { 151 { .compatible = "generic-ehci" }, 152 { } 153 }; 154 155 U_BOOT_DRIVER(ehci_generic) = { 156 .name = "ehci_generic", 157 .id = UCLASS_USB, 158 .of_match = ehci_usb_ids, 159 .probe = ehci_usb_probe, 160 .remove = ehci_usb_remove, 161 .ops = &ehci_usb_ops, 162 .priv_auto_alloc_size = sizeof(struct generic_ehci), 163 .flags = DM_FLAG_ALLOC_PRIV_DMA, 164 }; 165