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/err.h> 23 #include <linux/io.h> 24 #include <linux/clk.h> 25 #include <linux/err.h> 26 #include <linux/module.h> 27 #include <linux/mmc/host.h> 28 #include <linux/of.h> 29 30 #include "sdhci-pltfm.h" 31 32 struct sdhci_dove_priv { 33 struct clk *clk; 34 }; 35 36 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg) 37 { 38 u16 ret; 39 40 switch (reg) { 41 case SDHCI_HOST_VERSION: 42 case SDHCI_SLOT_INT_STATUS: 43 /* those registers don't exist */ 44 return 0; 45 default: 46 ret = readw(host->ioaddr + reg); 47 } 48 return ret; 49 } 50 51 static u32 sdhci_dove_readl(struct sdhci_host *host, int reg) 52 { 53 u32 ret; 54 55 switch (reg) { 56 case SDHCI_CAPABILITIES: 57 ret = readl(host->ioaddr + reg); 58 /* Mask the support for 3.0V */ 59 ret &= ~SDHCI_CAN_VDD_300; 60 break; 61 default: 62 ret = readl(host->ioaddr + reg); 63 } 64 return ret; 65 } 66 67 static struct sdhci_ops sdhci_dove_ops = { 68 .read_w = sdhci_dove_readw, 69 .read_l = sdhci_dove_readl, 70 }; 71 72 static struct sdhci_pltfm_data sdhci_dove_pdata = { 73 .ops = &sdhci_dove_ops, 74 .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER | 75 SDHCI_QUIRK_NO_BUSY_IRQ | 76 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 77 SDHCI_QUIRK_FORCE_DMA | 78 SDHCI_QUIRK_NO_HISPD_BIT, 79 }; 80 81 static int sdhci_dove_probe(struct platform_device *pdev) 82 { 83 struct sdhci_host *host; 84 struct sdhci_pltfm_host *pltfm_host; 85 struct sdhci_dove_priv *priv; 86 int ret; 87 88 priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv), 89 GFP_KERNEL); 90 if (!priv) { 91 dev_err(&pdev->dev, "unable to allocate private data"); 92 return -ENOMEM; 93 } 94 95 priv->clk = clk_get(&pdev->dev, NULL); 96 if (!IS_ERR(priv->clk)) 97 clk_prepare_enable(priv->clk); 98 99 ret = sdhci_pltfm_register(pdev, &sdhci_dove_pdata); 100 if (ret) 101 goto sdhci_dove_register_fail; 102 103 host = platform_get_drvdata(pdev); 104 pltfm_host = sdhci_priv(host); 105 pltfm_host->priv = priv; 106 107 return 0; 108 109 sdhci_dove_register_fail: 110 if (!IS_ERR(priv->clk)) { 111 clk_disable_unprepare(priv->clk); 112 clk_put(priv->clk); 113 } 114 return ret; 115 } 116 117 static int __devexit sdhci_dove_remove(struct platform_device *pdev) 118 { 119 struct sdhci_host *host = platform_get_drvdata(pdev); 120 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 121 struct sdhci_dove_priv *priv = pltfm_host->priv; 122 123 sdhci_pltfm_unregister(pdev); 124 125 if (!IS_ERR(priv->clk)) { 126 clk_disable_unprepare(priv->clk); 127 clk_put(priv->clk); 128 } 129 return 0; 130 } 131 132 static const struct of_device_id sdhci_dove_of_match_table[] = { 133 { .compatible = "marvell,dove-sdhci", }, 134 {} 135 }; 136 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table); 137 138 static struct platform_driver sdhci_dove_driver = { 139 .driver = { 140 .name = "sdhci-dove", 141 .owner = THIS_MODULE, 142 .pm = SDHCI_PLTFM_PMOPS, 143 .of_match_table = of_match_ptr(sdhci_dove_of_match_table), 144 }, 145 .probe = sdhci_dove_probe, 146 .remove = sdhci_dove_remove, 147 }; 148 149 module_platform_driver(sdhci_dove_driver); 150 151 MODULE_DESCRIPTION("SDHCI driver for Dove"); 152 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, " 153 "Mike Rapoport <mike@compulab.co.il>"); 154 MODULE_LICENSE("GPL v2"); 155