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/io.h> 25 #include <linux/mmc/host.h> 26 #include <linux/module.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 ret = readl(host->ioaddr + reg); 55 56 switch (reg) { 57 case SDHCI_CAPABILITIES: 58 /* Mask the support for 3.0V */ 59 ret &= ~SDHCI_CAN_VDD_300; 60 break; 61 } 62 return ret; 63 } 64 65 static const struct sdhci_ops sdhci_dove_ops = { 66 .read_w = sdhci_dove_readw, 67 .read_l = sdhci_dove_readl, 68 .set_clock = sdhci_set_clock, 69 .set_bus_width = sdhci_set_bus_width, 70 .reset = sdhci_reset, 71 .set_uhs_signaling = sdhci_set_uhs_signaling, 72 }; 73 74 static const struct sdhci_pltfm_data sdhci_dove_pdata = { 75 .ops = &sdhci_dove_ops, 76 .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER | 77 SDHCI_QUIRK_NO_BUSY_IRQ | 78 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 79 SDHCI_QUIRK_FORCE_DMA | 80 SDHCI_QUIRK_NO_HISPD_BIT, 81 }; 82 83 static int sdhci_dove_probe(struct platform_device *pdev) 84 { 85 struct sdhci_host *host; 86 struct sdhci_pltfm_host *pltfm_host; 87 struct sdhci_dove_priv *priv; 88 int ret; 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 return -ENOMEM; 95 } 96 97 priv->clk = devm_clk_get(&pdev->dev, NULL); 98 99 host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0); 100 if (IS_ERR(host)) 101 return PTR_ERR(host); 102 103 pltfm_host = sdhci_priv(host); 104 pltfm_host->priv = priv; 105 106 if (!IS_ERR(priv->clk)) 107 clk_prepare_enable(priv->clk); 108 109 ret = mmc_of_parse(host->mmc); 110 if (ret) 111 goto err_sdhci_add; 112 113 ret = sdhci_add_host(host); 114 if (ret) 115 goto err_sdhci_add; 116 117 return 0; 118 119 err_sdhci_add: 120 clk_disable_unprepare(priv->clk); 121 sdhci_pltfm_free(pdev); 122 return ret; 123 } 124 125 static int sdhci_dove_remove(struct platform_device *pdev) 126 { 127 struct sdhci_host *host = platform_get_drvdata(pdev); 128 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 129 struct sdhci_dove_priv *priv = pltfm_host->priv; 130 131 sdhci_pltfm_unregister(pdev); 132 133 clk_disable_unprepare(priv->clk); 134 135 return 0; 136 } 137 138 static const struct of_device_id sdhci_dove_of_match_table[] = { 139 { .compatible = "marvell,dove-sdhci", }, 140 {} 141 }; 142 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table); 143 144 static struct platform_driver sdhci_dove_driver = { 145 .driver = { 146 .name = "sdhci-dove", 147 .pm = SDHCI_PLTFM_PMOPS, 148 .of_match_table = sdhci_dove_of_match_table, 149 }, 150 .probe = sdhci_dove_probe, 151 .remove = sdhci_dove_remove, 152 }; 153 154 module_platform_driver(sdhci_dove_driver); 155 156 MODULE_DESCRIPTION("SDHCI driver for Dove"); 157 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, " 158 "Mike Rapoport <mike@compulab.co.il>"); 159 MODULE_LICENSE("GPL v2"); 160