| 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"); |