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