rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * drivers/mmc/host/sdhci-spear.c |
| 3 | * |
| 4 | * Support of SDHCI platform devices for spear soc family |
| 5 | * |
| 6 | * Copyright (C) 2010 ST Microelectronics |
| 7 | * Viresh Kumar <vireshk@kernel.org> |
| 8 | * |
| 9 | * Inspired by sdhci-pltfm.c |
| 10 | * |
| 11 | * This file is licensed under the terms of the GNU General Public |
| 12 | * License version 2. This program is licensed "as is" without any |
| 13 | * warranty of any kind, whether express or implied. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/clk.h> |
| 17 | #include <linux/delay.h> |
| 18 | #include <linux/gpio.h> |
| 19 | #include <linux/highmem.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/irq.h> |
| 23 | #include <linux/of.h> |
| 24 | #include <linux/of_gpio.h> |
| 25 | #include <linux/platform_device.h> |
| 26 | #include <linux/pm.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/mmc/host.h> |
| 29 | #include <linux/mmc/slot-gpio.h> |
| 30 | #include <linux/io.h> |
| 31 | #include "sdhci.h" |
| 32 | |
| 33 | struct spear_sdhci { |
| 34 | struct clk *clk; |
| 35 | int card_int_gpio; |
| 36 | }; |
| 37 | |
| 38 | /* sdhci ops */ |
| 39 | static const struct sdhci_ops sdhci_pltfm_ops = { |
| 40 | .set_clock = sdhci_set_clock, |
| 41 | .set_bus_width = sdhci_set_bus_width, |
| 42 | .reset = sdhci_reset, |
| 43 | .set_uhs_signaling = sdhci_set_uhs_signaling, |
| 44 | }; |
| 45 | |
| 46 | static void sdhci_probe_config_dt(struct device_node *np, |
| 47 | struct spear_sdhci *host) |
| 48 | { |
| 49 | int cd_gpio; |
| 50 | |
| 51 | cd_gpio = of_get_named_gpio(np, "cd-gpios", 0); |
| 52 | if (!gpio_is_valid(cd_gpio)) |
| 53 | cd_gpio = -1; |
| 54 | |
| 55 | host->card_int_gpio = cd_gpio; |
| 56 | } |
| 57 | |
| 58 | static int sdhci_probe(struct platform_device *pdev) |
| 59 | { |
| 60 | struct sdhci_host *host; |
| 61 | struct resource *iomem; |
| 62 | struct spear_sdhci *sdhci; |
| 63 | struct device *dev; |
| 64 | int ret; |
| 65 | |
| 66 | dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev; |
| 67 | host = sdhci_alloc_host(dev, sizeof(*sdhci)); |
| 68 | if (IS_ERR(host)) { |
| 69 | ret = PTR_ERR(host); |
| 70 | dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n"); |
| 71 | goto err; |
| 72 | } |
| 73 | |
| 74 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 75 | host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem); |
| 76 | if (IS_ERR(host->ioaddr)) { |
| 77 | ret = PTR_ERR(host->ioaddr); |
| 78 | dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret); |
| 79 | goto err_host; |
| 80 | } |
| 81 | |
| 82 | host->hw_name = "sdhci"; |
| 83 | host->ops = &sdhci_pltfm_ops; |
| 84 | host->irq = platform_get_irq(pdev, 0); |
| 85 | host->quirks = SDHCI_QUIRK_BROKEN_ADMA; |
| 86 | |
| 87 | sdhci = sdhci_priv(host); |
| 88 | |
| 89 | /* clk enable */ |
| 90 | sdhci->clk = devm_clk_get(&pdev->dev, NULL); |
| 91 | if (IS_ERR(sdhci->clk)) { |
| 92 | ret = PTR_ERR(sdhci->clk); |
| 93 | dev_dbg(&pdev->dev, "Error getting clock\n"); |
| 94 | goto err_host; |
| 95 | } |
| 96 | |
| 97 | ret = clk_prepare_enable(sdhci->clk); |
| 98 | if (ret) { |
| 99 | dev_dbg(&pdev->dev, "Error enabling clock\n"); |
| 100 | goto err_host; |
| 101 | } |
| 102 | |
| 103 | ret = clk_set_rate(sdhci->clk, 50000000); |
| 104 | if (ret) |
| 105 | dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n", |
| 106 | clk_get_rate(sdhci->clk)); |
| 107 | |
| 108 | sdhci_probe_config_dt(pdev->dev.of_node, sdhci); |
| 109 | /* |
| 110 | * It is optional to use GPIOs for sdhci card detection. If |
| 111 | * sdhci->card_int_gpio < 0, then use original sdhci lines otherwise |
| 112 | * GPIO lines. We use the built-in GPIO support for this. |
| 113 | */ |
| 114 | if (sdhci->card_int_gpio >= 0) { |
| 115 | ret = mmc_gpio_request_cd(host->mmc, sdhci->card_int_gpio, 0); |
| 116 | if (ret < 0) { |
| 117 | dev_dbg(&pdev->dev, |
| 118 | "failed to request card-detect gpio%d\n", |
| 119 | sdhci->card_int_gpio); |
| 120 | goto disable_clk; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | ret = sdhci_add_host(host); |
| 125 | if (ret) { |
| 126 | dev_dbg(&pdev->dev, "error adding host\n"); |
| 127 | goto disable_clk; |
| 128 | } |
| 129 | |
| 130 | platform_set_drvdata(pdev, host); |
| 131 | |
| 132 | return 0; |
| 133 | |
| 134 | disable_clk: |
| 135 | clk_disable_unprepare(sdhci->clk); |
| 136 | err_host: |
| 137 | sdhci_free_host(host); |
| 138 | err: |
| 139 | dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret); |
| 140 | return ret; |
| 141 | } |
| 142 | |
| 143 | static int sdhci_remove(struct platform_device *pdev) |
| 144 | { |
| 145 | struct sdhci_host *host = platform_get_drvdata(pdev); |
| 146 | struct spear_sdhci *sdhci = sdhci_priv(host); |
| 147 | int dead = 0; |
| 148 | u32 scratch; |
| 149 | |
| 150 | scratch = readl(host->ioaddr + SDHCI_INT_STATUS); |
| 151 | if (scratch == (u32)-1) |
| 152 | dead = 1; |
| 153 | |
| 154 | sdhci_remove_host(host, dead); |
| 155 | clk_disable_unprepare(sdhci->clk); |
| 156 | sdhci_free_host(host); |
| 157 | |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | #ifdef CONFIG_PM_SLEEP |
| 162 | static int sdhci_suspend(struct device *dev) |
| 163 | { |
| 164 | struct sdhci_host *host = dev_get_drvdata(dev); |
| 165 | struct spear_sdhci *sdhci = sdhci_priv(host); |
| 166 | int ret; |
| 167 | |
| 168 | if (host->tuning_mode != SDHCI_TUNING_MODE_3) |
| 169 | mmc_retune_needed(host->mmc); |
| 170 | |
| 171 | ret = sdhci_suspend_host(host); |
| 172 | if (!ret) |
| 173 | clk_disable(sdhci->clk); |
| 174 | |
| 175 | return ret; |
| 176 | } |
| 177 | |
| 178 | static int sdhci_resume(struct device *dev) |
| 179 | { |
| 180 | struct sdhci_host *host = dev_get_drvdata(dev); |
| 181 | struct spear_sdhci *sdhci = sdhci_priv(host); |
| 182 | int ret; |
| 183 | |
| 184 | ret = clk_enable(sdhci->clk); |
| 185 | if (ret) { |
| 186 | dev_dbg(dev, "Resume: Error enabling clock\n"); |
| 187 | return ret; |
| 188 | } |
| 189 | |
| 190 | return sdhci_resume_host(host); |
| 191 | } |
| 192 | #endif |
| 193 | |
| 194 | static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume); |
| 195 | |
| 196 | #ifdef CONFIG_OF |
| 197 | static const struct of_device_id sdhci_spear_id_table[] = { |
| 198 | { .compatible = "st,spear300-sdhci" }, |
| 199 | {} |
| 200 | }; |
| 201 | MODULE_DEVICE_TABLE(of, sdhci_spear_id_table); |
| 202 | #endif |
| 203 | |
| 204 | static struct platform_driver sdhci_driver = { |
| 205 | .driver = { |
| 206 | .name = "sdhci", |
| 207 | .pm = &sdhci_pm_ops, |
| 208 | .of_match_table = of_match_ptr(sdhci_spear_id_table), |
| 209 | }, |
| 210 | .probe = sdhci_probe, |
| 211 | .remove = sdhci_remove, |
| 212 | }; |
| 213 | |
| 214 | module_platform_driver(sdhci_driver); |
| 215 | |
| 216 | MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver"); |
| 217 | MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>"); |
| 218 | MODULE_LICENSE("GPL v2"); |