1 /* 2 * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC 3 * 4 * Author: Saeed Bishara <saeed@marvell.com> 5 * Mike Rapoport <mike@compulab.co.il> 6 * Based on sdhci-cns3xxx.c 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #include <linux/clk.h> 23 #include <linux/err.h> 24 #include <linux/gpio.h> 25 #include <linux/io.h> 26 #include <linux/mmc/host.h> 27 #include <linux/module.h> 28 #include <linux/of.h> 29 #include <linux/of_gpio.h> 30 31 #include "sdhci-pltfm.h" 32 33 struct sdhci_dove_priv { 34 struct clk *clk; 35 int gpio_cd; 36 }; 37 38 static irqreturn_t sdhci_dove_carddetect_irq(int irq, void *data) 39 { 40 struct sdhci_host *host = data; 41 42 tasklet_schedule(&host->card_tasklet); 43 return IRQ_HANDLED; 44 } 45 46 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg) 47 { 48 u16 ret; 49 50 switch (reg) { 51 case SDHCI_HOST_VERSION: 52 case SDHCI_SLOT_INT_STATUS: 53 /* those registers don't exist */ 54 return 0; 55 default: 56 ret = readw(host->ioaddr + reg); 57 } 58 return ret; 59 } 60 61 static u32 sdhci_dove_readl(struct sdhci_host *host, int reg) 62 { 63 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 64 struct sdhci_dove_priv *priv = pltfm_host->priv; 65 u32 ret; 66 67 ret = readl(host->ioaddr + reg); 68 69 switch (reg) { 70 case SDHCI_CAPABILITIES: 71 /* Mask the support for 3.0V */ 72 ret &= ~SDHCI_CAN_VDD_300; 73 break; 74 case SDHCI_PRESENT_STATE: 75 if (gpio_is_valid(priv->gpio_cd)) { 76 if (gpio_get_value(priv->gpio_cd) == 0) 77 ret |= SDHCI_CARD_PRESENT; 78 else 79 ret &= ~SDHCI_CARD_PRESENT; 80 } 81 break; 82 } 83 return ret; 84 } 85 86 static const struct sdhci_ops sdhci_dove_ops = { 87 .read_w = sdhci_dove_readw, 88 .read_l = sdhci_dove_readl, 89 }; 90 91 static const struct sdhci_pltfm_data sdhci_dove_pdata = { 92 .ops = &sdhci_dove_ops, 93 .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER | 94 SDHCI_QUIRK_NO_BUSY_IRQ | 95 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 96 SDHCI_QUIRK_FORCE_DMA | 97 SDHCI_QUIRK_NO_HISPD_BIT, 98 }; 99 100 static int sdhci_dove_probe(struct platform_device *pdev) 101 { 102 struct sdhci_host *host; 103 struct sdhci_pltfm_host *pltfm_host; 104 struct sdhci_dove_priv *priv; 105 int ret; 106 107 priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv), 108 GFP_KERNEL); 109 if (!priv) { 110 dev_err(&pdev->dev, "unable to allocate private data"); 111 return -ENOMEM; 112 } 113 114 priv->clk = devm_clk_get(&pdev->dev, NULL); 115 116 if (pdev->dev.of_node) { 117 priv->gpio_cd = of_get_named_gpio(pdev->dev.of_node, 118 "cd-gpios", 0); 119 } else { 120 priv->gpio_cd = -EINVAL; 121 } 122 123 if (gpio_is_valid(priv->gpio_cd)) { 124 ret = gpio_request(priv->gpio_cd, "sdhci-cd"); 125 if (ret) { 126 dev_err(&pdev->dev, "card detect gpio request failed: %d\n", 127 ret); 128 return ret; 129 } 130 gpio_direction_input(priv->gpio_cd); 131 } 132 133 host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0); 134 if (IS_ERR(host)) { 135 ret = PTR_ERR(host); 136 goto err_sdhci_pltfm_init; 137 } 138 139 pltfm_host = sdhci_priv(host); 140 pltfm_host->priv = priv; 141 142 if (!IS_ERR(priv->clk)) 143 clk_prepare_enable(priv->clk); 144 145 sdhci_get_of_property(pdev); 146 147 ret = sdhci_add_host(host); 148 if (ret) 149 goto err_sdhci_add; 150 151 /* 152 * We must request the IRQ after sdhci_add_host(), as the tasklet only 153 * gets setup in sdhci_add_host() and we oops. 154 */ 155 if (gpio_is_valid(priv->gpio_cd)) { 156 ret = request_irq(gpio_to_irq(priv->gpio_cd), 157 sdhci_dove_carddetect_irq, 158 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, 159 mmc_hostname(host->mmc), host); 160 if (ret) { 161 dev_err(&pdev->dev, "card detect irq request failed: %d\n", 162 ret); 163 goto err_request_irq; 164 } 165 } 166 167 return 0; 168 169 err_request_irq: 170 sdhci_remove_host(host, 0); 171 err_sdhci_add: 172 if (!IS_ERR(priv->clk)) 173 clk_disable_unprepare(priv->clk); 174 sdhci_pltfm_free(pdev); 175 err_sdhci_pltfm_init: 176 if (gpio_is_valid(priv->gpio_cd)) 177 gpio_free(priv->gpio_cd); 178 return ret; 179 } 180 181 static int sdhci_dove_remove(struct platform_device *pdev) 182 { 183 struct sdhci_host *host = platform_get_drvdata(pdev); 184 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 185 struct sdhci_dove_priv *priv = pltfm_host->priv; 186 187 sdhci_pltfm_unregister(pdev); 188 189 if (gpio_is_valid(priv->gpio_cd)) { 190 free_irq(gpio_to_irq(priv->gpio_cd), host); 191 gpio_free(priv->gpio_cd); 192 } 193 194 if (!IS_ERR(priv->clk)) 195 clk_disable_unprepare(priv->clk); 196 197 return 0; 198 } 199 200 static const struct of_device_id sdhci_dove_of_match_table[] = { 201 { .compatible = "marvell,dove-sdhci", }, 202 {} 203 }; 204 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table); 205 206 static struct platform_driver sdhci_dove_driver = { 207 .driver = { 208 .name = "sdhci-dove", 209 .owner = THIS_MODULE, 210 .pm = SDHCI_PLTFM_PMOPS, 211 .of_match_table = of_match_ptr(sdhci_dove_of_match_table), 212 }, 213 .probe = sdhci_dove_probe, 214 .remove = sdhci_dove_remove, 215 }; 216 217 module_platform_driver(sdhci_dove_driver); 218 219 MODULE_DESCRIPTION("SDHCI driver for Dove"); 220 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, " 221 "Mike Rapoport <mike@compulab.co.il>"); 222 MODULE_LICENSE("GPL v2"); 223