Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [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 |
Viresh Kumar | da89947 | 2015-07-17 16:23:50 -0700 | [diff] [blame] | 7 | * Viresh Kumar <vireshk@kernel.org> |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 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> |
Paul Gortmaker | 88b4767 | 2011-07-03 15:15:51 -0400 | [diff] [blame] | 20 | #include <linux/module.h> |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/irq.h> |
Viresh Kumar | 067bf74 | 2012-09-28 15:58:22 +0530 | [diff] [blame] | 23 | #include <linux/of.h> |
| 24 | #include <linux/of_gpio.h> |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 25 | #include <linux/platform_device.h> |
Viresh Kumar | b70a7fa | 2011-11-15 16:24:40 +0530 | [diff] [blame] | 26 | #include <linux/pm.h> |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 27 | #include <linux/slab.h> |
| 28 | #include <linux/mmc/host.h> |
Russell King | b42b9b1 | 2014-02-28 21:32:49 +0000 | [diff] [blame] | 29 | #include <linux/mmc/slot-gpio.h> |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 30 | #include <linux/io.h> |
| 31 | #include "sdhci.h" |
| 32 | |
| 33 | struct spear_sdhci { |
| 34 | struct clk *clk; |
Ulf Hansson | 03a6d29 | 2015-03-04 16:30:07 +0100 | [diff] [blame] | 35 | int card_int_gpio; |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 36 | }; |
| 37 | |
| 38 | /* sdhci ops */ |
Lars-Peter Clausen | c915568 | 2013-03-13 19:26:05 +0100 | [diff] [blame] | 39 | static const struct sdhci_ops sdhci_pltfm_ops = { |
Russell King | 1771059 | 2014-04-25 12:58:55 +0100 | [diff] [blame] | 40 | .set_clock = sdhci_set_clock, |
Russell King | 2317f56 | 2014-04-25 12:57:07 +0100 | [diff] [blame] | 41 | .set_bus_width = sdhci_set_bus_width, |
Russell King | 03231f9 | 2014-04-25 12:57:12 +0100 | [diff] [blame] | 42 | .reset = sdhci_reset, |
Russell King | 96d7b78 | 2014-04-25 12:59:26 +0100 | [diff] [blame] | 43 | .set_uhs_signaling = sdhci_set_uhs_signaling, |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 44 | }; |
| 45 | |
Ulf Hansson | 03a6d29 | 2015-03-04 16:30:07 +0100 | [diff] [blame] | 46 | static void sdhci_probe_config_dt(struct device_node *np, |
| 47 | struct spear_sdhci *host) |
Viresh Kumar | 067bf74 | 2012-09-28 15:58:22 +0530 | [diff] [blame] | 48 | { |
Viresh Kumar | 067bf74 | 2012-09-28 15:58:22 +0530 | [diff] [blame] | 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 | |
Ulf Hansson | 03a6d29 | 2015-03-04 16:30:07 +0100 | [diff] [blame] | 55 | host->card_int_gpio = cd_gpio; |
Viresh Kumar | 067bf74 | 2012-09-28 15:58:22 +0530 | [diff] [blame] | 56 | } |
Viresh Kumar | 067bf74 | 2012-09-28 15:58:22 +0530 | [diff] [blame] | 57 | |
Bill Pemberton | c3be1ef | 2012-11-19 13:23:06 -0500 | [diff] [blame] | 58 | static int sdhci_probe(struct platform_device *pdev) |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 59 | { |
| 60 | struct sdhci_host *host; |
| 61 | struct resource *iomem; |
| 62 | struct spear_sdhci *sdhci; |
Russell King | fcdb7c8 | 2014-02-28 21:32:34 +0000 | [diff] [blame] | 63 | struct device *dev; |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 64 | int ret; |
| 65 | |
Russell King | fcdb7c8 | 2014-02-28 21:32:34 +0000 | [diff] [blame] | 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); |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 70 | dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n"); |
Viresh Kumar | 6ebaf8f | 2012-03-27 08:40:35 +0530 | [diff] [blame] | 71 | goto err; |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 72 | } |
| 73 | |
Russell King | 475d9e3 | 2014-02-28 21:32:39 +0000 | [diff] [blame] | 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 | |
Russell King | fcdb7c8 | 2014-02-28 21:32:34 +0000 | [diff] [blame] | 87 | sdhci = sdhci_priv(host); |
| 88 | |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 89 | /* clk enable */ |
Russell King | 142dbab9 | 2014-02-28 21:32:29 +0000 | [diff] [blame] | 90 | sdhci->clk = devm_clk_get(&pdev->dev, NULL); |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 91 | if (IS_ERR(sdhci->clk)) { |
| 92 | ret = PTR_ERR(sdhci->clk); |
| 93 | dev_dbg(&pdev->dev, "Error getting clock\n"); |
Russell King | fcdb7c8 | 2014-02-28 21:32:34 +0000 | [diff] [blame] | 94 | goto err_host; |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 95 | } |
| 96 | |
Viresh Kumar | da764f9 | 2012-09-28 15:58:23 +0530 | [diff] [blame] | 97 | ret = clk_prepare_enable(sdhci->clk); |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 98 | if (ret) { |
| 99 | dev_dbg(&pdev->dev, "Error enabling clock\n"); |
Russell King | fcdb7c8 | 2014-02-28 21:32:34 +0000 | [diff] [blame] | 100 | goto err_host; |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 101 | } |
| 102 | |
Vipul Kumar Samar | 257f9df | 2012-11-08 20:39:09 +0530 | [diff] [blame] | 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 | |
Ulf Hansson | 03a6d29 | 2015-03-04 16:30:07 +0100 | [diff] [blame] | 108 | sdhci_probe_config_dt(pdev->dev.of_node, sdhci); |
Russell King | b42b9b1 | 2014-02-28 21:32:49 +0000 | [diff] [blame] | 109 | /* |
| 110 | * It is optional to use GPIOs for sdhci card detection. If |
Ulf Hansson | 03a6d29 | 2015-03-04 16:30:07 +0100 | [diff] [blame] | 111 | * sdhci->card_int_gpio < 0, then use original sdhci lines otherwise |
Russell King | b42b9b1 | 2014-02-28 21:32:49 +0000 | [diff] [blame] | 112 | * GPIO lines. We use the built-in GPIO support for this. |
| 113 | */ |
Ulf Hansson | 03a6d29 | 2015-03-04 16:30:07 +0100 | [diff] [blame] | 114 | if (sdhci->card_int_gpio >= 0) { |
| 115 | ret = mmc_gpio_request_cd(host->mmc, sdhci->card_int_gpio, 0); |
Russell King | b42b9b1 | 2014-02-28 21:32:49 +0000 | [diff] [blame] | 116 | if (ret < 0) { |
| 117 | dev_dbg(&pdev->dev, |
| 118 | "failed to request card-detect gpio%d\n", |
Ulf Hansson | 03a6d29 | 2015-03-04 16:30:07 +0100 | [diff] [blame] | 119 | sdhci->card_int_gpio); |
Russell King | b42b9b1 | 2014-02-28 21:32:49 +0000 | [diff] [blame] | 120 | goto disable_clk; |
| 121 | } |
| 122 | } |
| 123 | |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 124 | ret = sdhci_add_host(host); |
| 125 | if (ret) { |
| 126 | dev_dbg(&pdev->dev, "error adding host\n"); |
Russell King | fcdb7c8 | 2014-02-28 21:32:34 +0000 | [diff] [blame] | 127 | goto disable_clk; |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | platform_set_drvdata(pdev, host); |
| 131 | |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 132 | return 0; |
| 133 | |
Viresh Kumar | 6ebaf8f | 2012-03-27 08:40:35 +0530 | [diff] [blame] | 134 | disable_clk: |
Viresh Kumar | da764f9 | 2012-09-28 15:58:23 +0530 | [diff] [blame] | 135 | clk_disable_unprepare(sdhci->clk); |
Russell King | fcdb7c8 | 2014-02-28 21:32:34 +0000 | [diff] [blame] | 136 | err_host: |
| 137 | sdhci_free_host(host); |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 138 | err: |
| 139 | dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret); |
| 140 | return ret; |
| 141 | } |
| 142 | |
Bill Pemberton | 6e0ee71 | 2012-11-19 13:26:03 -0500 | [diff] [blame] | 143 | static int sdhci_remove(struct platform_device *pdev) |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 144 | { |
| 145 | struct sdhci_host *host = platform_get_drvdata(pdev); |
Russell King | fcdb7c8 | 2014-02-28 21:32:34 +0000 | [diff] [blame] | 146 | struct spear_sdhci *sdhci = sdhci_priv(host); |
Viresh Kumar | 6ebaf8f | 2012-03-27 08:40:35 +0530 | [diff] [blame] | 147 | int dead = 0; |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 148 | u32 scratch; |
| 149 | |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 150 | scratch = readl(host->ioaddr + SDHCI_INT_STATUS); |
| 151 | if (scratch == (u32)-1) |
| 152 | dead = 1; |
| 153 | |
| 154 | sdhci_remove_host(host, dead); |
Viresh Kumar | da764f9 | 2012-09-28 15:58:23 +0530 | [diff] [blame] | 155 | clk_disable_unprepare(sdhci->clk); |
Russell King | fcdb7c8 | 2014-02-28 21:32:34 +0000 | [diff] [blame] | 156 | sdhci_free_host(host); |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 157 | |
| 158 | return 0; |
| 159 | } |
| 160 | |
Jingoo Han | b0dd099 | 2013-03-29 16:08:00 +0900 | [diff] [blame] | 161 | #ifdef CONFIG_PM_SLEEP |
Viresh Kumar | b70a7fa | 2011-11-15 16:24:40 +0530 | [diff] [blame] | 162 | static int sdhci_suspend(struct device *dev) |
| 163 | { |
| 164 | struct sdhci_host *host = dev_get_drvdata(dev); |
Russell King | fcdb7c8 | 2014-02-28 21:32:34 +0000 | [diff] [blame] | 165 | struct spear_sdhci *sdhci = sdhci_priv(host); |
Viresh Kumar | b70a7fa | 2011-11-15 16:24:40 +0530 | [diff] [blame] | 166 | int ret; |
| 167 | |
Adrian Hunter | d38dcad | 2017-03-20 19:50:32 +0200 | [diff] [blame^] | 168 | if (host->tuning_mode != SDHCI_TUNING_MODE_3) |
| 169 | mmc_retune_needed(host->mmc); |
| 170 | |
Viresh Kumar | 984589e | 2012-01-04 11:48:42 +0530 | [diff] [blame] | 171 | ret = sdhci_suspend_host(host); |
Viresh Kumar | b70a7fa | 2011-11-15 16:24:40 +0530 | [diff] [blame] | 172 | if (!ret) |
Viresh Kumar | 06960a1 | 2012-11-08 20:39:10 +0530 | [diff] [blame] | 173 | clk_disable(sdhci->clk); |
Viresh Kumar | b70a7fa | 2011-11-15 16:24:40 +0530 | [diff] [blame] | 174 | |
| 175 | return ret; |
| 176 | } |
| 177 | |
| 178 | static int sdhci_resume(struct device *dev) |
| 179 | { |
| 180 | struct sdhci_host *host = dev_get_drvdata(dev); |
Russell King | fcdb7c8 | 2014-02-28 21:32:34 +0000 | [diff] [blame] | 181 | struct spear_sdhci *sdhci = sdhci_priv(host); |
Viresh Kumar | b70a7fa | 2011-11-15 16:24:40 +0530 | [diff] [blame] | 182 | int ret; |
| 183 | |
Viresh Kumar | 06960a1 | 2012-11-08 20:39:10 +0530 | [diff] [blame] | 184 | ret = clk_enable(sdhci->clk); |
Viresh Kumar | b70a7fa | 2011-11-15 16:24:40 +0530 | [diff] [blame] | 185 | if (ret) { |
| 186 | dev_dbg(dev, "Resume: Error enabling clock\n"); |
| 187 | return ret; |
| 188 | } |
| 189 | |
| 190 | return sdhci_resume_host(host); |
| 191 | } |
Viresh Kumar | b70a7fa | 2011-11-15 16:24:40 +0530 | [diff] [blame] | 192 | #endif |
| 193 | |
Shiraz Hashim | 4b1a617 | 2012-02-24 11:55:35 +0530 | [diff] [blame] | 194 | static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume); |
| 195 | |
Viresh Kumar | 067bf74 | 2012-09-28 15:58:22 +0530 | [diff] [blame] | 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 | |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 204 | static struct platform_driver sdhci_driver = { |
| 205 | .driver = { |
| 206 | .name = "sdhci", |
Viresh Kumar | b70a7fa | 2011-11-15 16:24:40 +0530 | [diff] [blame] | 207 | .pm = &sdhci_pm_ops, |
Viresh Kumar | 067bf74 | 2012-09-28 15:58:22 +0530 | [diff] [blame] | 208 | .of_match_table = of_match_ptr(sdhci_spear_id_table), |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 209 | }, |
| 210 | .probe = sdhci_probe, |
Bill Pemberton | 0433c14 | 2012-11-19 13:20:26 -0500 | [diff] [blame] | 211 | .remove = sdhci_remove, |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 212 | }; |
| 213 | |
Axel Lin | d1f81a6 | 2011-11-26 12:55:43 +0800 | [diff] [blame] | 214 | module_platform_driver(sdhci_driver); |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 215 | |
| 216 | MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver"); |
Viresh Kumar | da89947 | 2015-07-17 16:23:50 -0700 | [diff] [blame] | 217 | MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>"); |
Viresh KUMAR | c63b3cb | 2010-05-26 14:42:10 -0700 | [diff] [blame] | 218 | MODULE_LICENSE("GPL v2"); |