1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // reset-uniphier-glue.c - Glue layer reset driver for UniPhier 4 // Copyright 2018 Socionext Inc. 5 // Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> 6 7 #include <linux/clk.h> 8 #include <linux/module.h> 9 #include <linux/of.h> 10 #include <linux/platform_device.h> 11 #include <linux/reset.h> 12 #include <linux/reset/reset-simple.h> 13 14 #define MAX_CLKS 2 15 #define MAX_RSTS 2 16 17 struct uniphier_glue_reset_soc_data { 18 int nclks; 19 const char * const *clock_names; 20 int nrsts; 21 const char * const *reset_names; 22 }; 23 24 struct uniphier_glue_reset_priv { 25 struct clk_bulk_data clk[MAX_CLKS]; 26 struct reset_control_bulk_data rst[MAX_RSTS]; 27 struct reset_simple_data rdata; 28 const struct uniphier_glue_reset_soc_data *data; 29 }; 30 31 static void uniphier_clk_disable(void *_priv) 32 { 33 struct uniphier_glue_reset_priv *priv = _priv; 34 35 clk_bulk_disable_unprepare(priv->data->nclks, priv->clk); 36 } 37 38 static void uniphier_rst_assert(void *_priv) 39 { 40 struct uniphier_glue_reset_priv *priv = _priv; 41 42 reset_control_bulk_assert(priv->data->nrsts, priv->rst); 43 } 44 45 static int uniphier_glue_reset_probe(struct platform_device *pdev) 46 { 47 struct device *dev = &pdev->dev; 48 struct uniphier_glue_reset_priv *priv; 49 struct resource *res; 50 int i, ret; 51 52 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 53 if (!priv) 54 return -ENOMEM; 55 56 priv->data = of_device_get_match_data(dev); 57 if (WARN_ON(!priv->data || priv->data->nclks > MAX_CLKS || 58 priv->data->nrsts > MAX_RSTS)) 59 return -EINVAL; 60 61 priv->rdata.membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 62 if (IS_ERR(priv->rdata.membase)) 63 return PTR_ERR(priv->rdata.membase); 64 65 for (i = 0; i < priv->data->nclks; i++) 66 priv->clk[i].id = priv->data->clock_names[i]; 67 ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk); 68 if (ret) 69 return ret; 70 71 for (i = 0; i < priv->data->nrsts; i++) 72 priv->rst[i].id = priv->data->reset_names[i]; 73 ret = devm_reset_control_bulk_get_shared(dev, priv->data->nrsts, 74 priv->rst); 75 if (ret) 76 return ret; 77 78 ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk); 79 if (ret) 80 return ret; 81 82 ret = devm_add_action_or_reset(dev, uniphier_clk_disable, priv); 83 if (ret) 84 return ret; 85 86 ret = reset_control_bulk_deassert(priv->data->nrsts, priv->rst); 87 if (ret) 88 return ret; 89 90 ret = devm_add_action_or_reset(dev, uniphier_rst_assert, priv); 91 if (ret) 92 return ret; 93 94 spin_lock_init(&priv->rdata.lock); 95 priv->rdata.rcdev.owner = THIS_MODULE; 96 priv->rdata.rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE; 97 priv->rdata.rcdev.ops = &reset_simple_ops; 98 priv->rdata.rcdev.of_node = dev->of_node; 99 priv->rdata.active_low = true; 100 101 return devm_reset_controller_register(dev, &priv->rdata.rcdev); 102 } 103 104 static const char * const uniphier_pro4_clock_reset_names[] = { 105 "gio", "link", 106 }; 107 108 static const struct uniphier_glue_reset_soc_data uniphier_pro4_data = { 109 .nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names), 110 .clock_names = uniphier_pro4_clock_reset_names, 111 .nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names), 112 .reset_names = uniphier_pro4_clock_reset_names, 113 }; 114 115 static const char * const uniphier_pxs2_clock_reset_names[] = { 116 "link", 117 }; 118 119 static const struct uniphier_glue_reset_soc_data uniphier_pxs2_data = { 120 .nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names), 121 .clock_names = uniphier_pxs2_clock_reset_names, 122 .nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names), 123 .reset_names = uniphier_pxs2_clock_reset_names, 124 }; 125 126 static const struct of_device_id uniphier_glue_reset_match[] = { 127 { 128 .compatible = "socionext,uniphier-pro4-usb3-reset", 129 .data = &uniphier_pro4_data, 130 }, 131 { 132 .compatible = "socionext,uniphier-pro5-usb3-reset", 133 .data = &uniphier_pro4_data, 134 }, 135 { 136 .compatible = "socionext,uniphier-pxs2-usb3-reset", 137 .data = &uniphier_pxs2_data, 138 }, 139 { 140 .compatible = "socionext,uniphier-ld20-usb3-reset", 141 .data = &uniphier_pxs2_data, 142 }, 143 { 144 .compatible = "socionext,uniphier-pxs3-usb3-reset", 145 .data = &uniphier_pxs2_data, 146 }, 147 { 148 .compatible = "socionext,uniphier-nx1-usb3-reset", 149 .data = &uniphier_pxs2_data, 150 }, 151 { 152 .compatible = "socionext,uniphier-pro4-ahci-reset", 153 .data = &uniphier_pro4_data, 154 }, 155 { 156 .compatible = "socionext,uniphier-pxs2-ahci-reset", 157 .data = &uniphier_pxs2_data, 158 }, 159 { 160 .compatible = "socionext,uniphier-pxs3-ahci-reset", 161 .data = &uniphier_pxs2_data, 162 }, 163 { /* Sentinel */ } 164 }; 165 MODULE_DEVICE_TABLE(of, uniphier_glue_reset_match); 166 167 static struct platform_driver uniphier_glue_reset_driver = { 168 .probe = uniphier_glue_reset_probe, 169 .driver = { 170 .name = "uniphier-glue-reset", 171 .of_match_table = uniphier_glue_reset_match, 172 }, 173 }; 174 module_platform_driver(uniphier_glue_reset_driver); 175 176 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>"); 177 MODULE_DESCRIPTION("UniPhier Glue layer reset driver"); 178 MODULE_LICENSE("GPL"); 179