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