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 *rst[MAX_RSTS]; 27 struct reset_simple_data rdata; 28 const struct uniphier_glue_reset_soc_data *data; 29 }; 30 31 static int uniphier_glue_reset_probe(struct platform_device *pdev) 32 { 33 struct device *dev = &pdev->dev; 34 struct uniphier_glue_reset_priv *priv; 35 struct resource *res; 36 resource_size_t size; 37 const char *name; 38 int i, ret, nr; 39 40 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 41 if (!priv) 42 return -ENOMEM; 43 44 priv->data = of_device_get_match_data(dev); 45 if (WARN_ON(!priv->data || priv->data->nclks > MAX_CLKS || 46 priv->data->nrsts > MAX_RSTS)) 47 return -EINVAL; 48 49 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 50 size = resource_size(res); 51 priv->rdata.membase = devm_ioremap_resource(dev, res); 52 if (IS_ERR(priv->rdata.membase)) 53 return PTR_ERR(priv->rdata.membase); 54 55 for (i = 0; i < priv->data->nclks; i++) 56 priv->clk[i].id = priv->data->clock_names[i]; 57 ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk); 58 if (ret) 59 return ret; 60 61 for (i = 0; i < priv->data->nrsts; i++) { 62 name = priv->data->reset_names[i]; 63 priv->rst[i] = devm_reset_control_get_shared(dev, name); 64 if (IS_ERR(priv->rst[i])) 65 return PTR_ERR(priv->rst[i]); 66 } 67 68 ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk); 69 if (ret) 70 return ret; 71 72 for (nr = 0; nr < priv->data->nrsts; nr++) { 73 ret = reset_control_deassert(priv->rst[nr]); 74 if (ret) 75 goto out_rst_assert; 76 } 77 78 spin_lock_init(&priv->rdata.lock); 79 priv->rdata.rcdev.owner = THIS_MODULE; 80 priv->rdata.rcdev.nr_resets = size * BITS_PER_BYTE; 81 priv->rdata.rcdev.ops = &reset_simple_ops; 82 priv->rdata.rcdev.of_node = dev->of_node; 83 priv->rdata.active_low = true; 84 85 platform_set_drvdata(pdev, priv); 86 87 ret = devm_reset_controller_register(dev, &priv->rdata.rcdev); 88 if (ret) 89 goto out_rst_assert; 90 91 return 0; 92 93 out_rst_assert: 94 while (nr--) 95 reset_control_assert(priv->rst[nr]); 96 97 clk_bulk_disable_unprepare(priv->data->nclks, priv->clk); 98 99 return ret; 100 } 101 102 static int uniphier_glue_reset_remove(struct platform_device *pdev) 103 { 104 struct uniphier_glue_reset_priv *priv = platform_get_drvdata(pdev); 105 int i; 106 107 for (i = 0; i < priv->data->nrsts; i++) 108 reset_control_assert(priv->rst[i]); 109 110 clk_bulk_disable_unprepare(priv->data->nclks, priv->clk); 111 112 return 0; 113 } 114 115 static const char * const uniphier_pro4_clock_reset_names[] = { 116 "gio", "link", 117 }; 118 119 static const struct uniphier_glue_reset_soc_data uniphier_pro4_data = { 120 .nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names), 121 .clock_names = uniphier_pro4_clock_reset_names, 122 .nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names), 123 .reset_names = uniphier_pro4_clock_reset_names, 124 }; 125 126 static const char * const uniphier_pxs2_clock_reset_names[] = { 127 "link", 128 }; 129 130 static const struct uniphier_glue_reset_soc_data uniphier_pxs2_data = { 131 .nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names), 132 .clock_names = uniphier_pxs2_clock_reset_names, 133 .nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names), 134 .reset_names = uniphier_pxs2_clock_reset_names, 135 }; 136 137 static const struct of_device_id uniphier_glue_reset_match[] = { 138 { 139 .compatible = "socionext,uniphier-pro4-usb3-reset", 140 .data = &uniphier_pro4_data, 141 }, 142 { 143 .compatible = "socionext,uniphier-pro5-usb3-reset", 144 .data = &uniphier_pro4_data, 145 }, 146 { 147 .compatible = "socionext,uniphier-pxs2-usb3-reset", 148 .data = &uniphier_pxs2_data, 149 }, 150 { 151 .compatible = "socionext,uniphier-ld20-usb3-reset", 152 .data = &uniphier_pxs2_data, 153 }, 154 { 155 .compatible = "socionext,uniphier-pxs3-usb3-reset", 156 .data = &uniphier_pxs2_data, 157 }, 158 { 159 .compatible = "socionext,uniphier-pro4-ahci-reset", 160 .data = &uniphier_pro4_data, 161 }, 162 { 163 .compatible = "socionext,uniphier-pxs2-ahci-reset", 164 .data = &uniphier_pxs2_data, 165 }, 166 { 167 .compatible = "socionext,uniphier-pxs3-ahci-reset", 168 .data = &uniphier_pxs2_data, 169 }, 170 { /* Sentinel */ } 171 }; 172 MODULE_DEVICE_TABLE(of, uniphier_glue_reset_match); 173 174 static struct platform_driver uniphier_glue_reset_driver = { 175 .probe = uniphier_glue_reset_probe, 176 .remove = uniphier_glue_reset_remove, 177 .driver = { 178 .name = "uniphier-glue-reset", 179 .of_match_table = uniphier_glue_reset_match, 180 }, 181 }; 182 module_platform_driver(uniphier_glue_reset_driver); 183 184 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>"); 185 MODULE_DESCRIPTION("UniPhier Glue layer reset driver"); 186 MODULE_LICENSE("GPL"); 187