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_device.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 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 62 priv->rdata.membase = devm_ioremap_resource(dev, res); 63 if (IS_ERR(priv->rdata.membase)) 64 return PTR_ERR(priv->rdata.membase); 65 66 for (i = 0; i < priv->data->nclks; i++) 67 priv->clk[i].id = priv->data->clock_names[i]; 68 ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk); 69 if (ret) 70 return ret; 71 72 for (i = 0; i < priv->data->nrsts; i++) 73 priv->rst[i].id = priv->data->reset_names[i]; 74 ret = devm_reset_control_bulk_get_shared(dev, priv->data->nrsts, 75 priv->rst); 76 if (ret) 77 return ret; 78 79 ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk); 80 if (ret) 81 return ret; 82 83 ret = devm_add_action_or_reset(dev, uniphier_clk_disable, priv); 84 if (ret) 85 return ret; 86 87 ret = reset_control_bulk_deassert(priv->data->nrsts, priv->rst); 88 if (ret) 89 return ret; 90 91 ret = devm_add_action_or_reset(dev, uniphier_rst_assert, priv); 92 if (ret) 93 return ret; 94 95 spin_lock_init(&priv->rdata.lock); 96 priv->rdata.rcdev.owner = THIS_MODULE; 97 priv->rdata.rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE; 98 priv->rdata.rcdev.ops = &reset_simple_ops; 99 priv->rdata.rcdev.of_node = dev->of_node; 100 priv->rdata.active_low = true; 101 102 platform_set_drvdata(pdev, priv); 103 104 return devm_reset_controller_register(dev, &priv->rdata.rcdev); 105 } 106 107 static const char * const uniphier_pro4_clock_reset_names[] = { 108 "gio", "link", 109 }; 110 111 static const struct uniphier_glue_reset_soc_data uniphier_pro4_data = { 112 .nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names), 113 .clock_names = uniphier_pro4_clock_reset_names, 114 .nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names), 115 .reset_names = uniphier_pro4_clock_reset_names, 116 }; 117 118 static const char * const uniphier_pxs2_clock_reset_names[] = { 119 "link", 120 }; 121 122 static const struct uniphier_glue_reset_soc_data uniphier_pxs2_data = { 123 .nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names), 124 .clock_names = uniphier_pxs2_clock_reset_names, 125 .nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names), 126 .reset_names = uniphier_pxs2_clock_reset_names, 127 }; 128 129 static const struct of_device_id uniphier_glue_reset_match[] = { 130 { 131 .compatible = "socionext,uniphier-pro4-usb3-reset", 132 .data = &uniphier_pro4_data, 133 }, 134 { 135 .compatible = "socionext,uniphier-pro5-usb3-reset", 136 .data = &uniphier_pro4_data, 137 }, 138 { 139 .compatible = "socionext,uniphier-pxs2-usb3-reset", 140 .data = &uniphier_pxs2_data, 141 }, 142 { 143 .compatible = "socionext,uniphier-ld20-usb3-reset", 144 .data = &uniphier_pxs2_data, 145 }, 146 { 147 .compatible = "socionext,uniphier-pxs3-usb3-reset", 148 .data = &uniphier_pxs2_data, 149 }, 150 { 151 .compatible = "socionext,uniphier-nx1-usb3-reset", 152 .data = &uniphier_pxs2_data, 153 }, 154 { 155 .compatible = "socionext,uniphier-pro4-ahci-reset", 156 .data = &uniphier_pro4_data, 157 }, 158 { 159 .compatible = "socionext,uniphier-pxs2-ahci-reset", 160 .data = &uniphier_pxs2_data, 161 }, 162 { 163 .compatible = "socionext,uniphier-pxs3-ahci-reset", 164 .data = &uniphier_pxs2_data, 165 }, 166 { /* Sentinel */ } 167 }; 168 MODULE_DEVICE_TABLE(of, uniphier_glue_reset_match); 169 170 static struct platform_driver uniphier_glue_reset_driver = { 171 .probe = uniphier_glue_reset_probe, 172 .driver = { 173 .name = "uniphier-glue-reset", 174 .of_match_table = uniphier_glue_reset_match, 175 }, 176 }; 177 module_platform_driver(uniphier_glue_reset_driver); 178 179 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>"); 180 MODULE_DESCRIPTION("UniPhier Glue layer reset driver"); 181 MODULE_LICENSE("GPL"); 182