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 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg) 32 { 33 u16 ret; 34 35 switch (reg) { 36 case SDHCI_HOST_VERSION: 37 case SDHCI_SLOT_INT_STATUS: 38 /* those registers don't exist */ 39 return 0; 40 default: 41 ret = readw(host->ioaddr + reg); 42 } 43 return ret; 44 } 45 46 static u32 sdhci_dove_readl(struct sdhci_host *host, int reg) 47 { 48 u32 ret; 49 50 ret = readl(host->ioaddr + reg); 51 52 switch (reg) { 53 case SDHCI_CAPABILITIES: 54 /* Mask the support for 3.0V */ 55 ret &= ~SDHCI_CAN_VDD_300; 56 break; 57 } 58 return ret; 59 } 60 61 static const struct sdhci_ops sdhci_dove_ops = { 62 .read_w = sdhci_dove_readw, 63 .read_l = sdhci_dove_readl, 64 .set_clock = sdhci_set_clock, 65 .set_bus_width = sdhci_set_bus_width, 66 .reset = sdhci_reset, 67 .set_uhs_signaling = sdhci_set_uhs_signaling, 68 }; 69 70 static const 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 sdhci_dove_probe(struct platform_device *pdev) 80 { 81 struct sdhci_host *host; 82 struct sdhci_pltfm_host *pltfm_host; 83 int ret; 84 85 host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0); 86 if (IS_ERR(host)) 87 return PTR_ERR(host); 88 89 pltfm_host = sdhci_priv(host); 90 pltfm_host->clk = devm_clk_get(&pdev->dev, NULL); 91 92 if (!IS_ERR(pltfm_host->clk)) 93 clk_prepare_enable(pltfm_host->clk); 94 95 ret = mmc_of_parse(host->mmc); 96 if (ret) 97 goto err_sdhci_add; 98 99 ret = sdhci_add_host(host); 100 if (ret) 101 goto err_sdhci_add; 102 103 return 0; 104 105 err_sdhci_add: 106 clk_disable_unprepare(pltfm_host->clk); 107 sdhci_pltfm_free(pdev); 108 return ret; 109 } 110 111 static const struct of_device_id sdhci_dove_of_match_table[] = { 112 { .compatible = "marvell,dove-sdhci", }, 113 {} 114 }; 115 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table); 116 117 static struct platform_driver sdhci_dove_driver = { 118 .driver = { 119 .name = "sdhci-dove", 120 .pm = SDHCI_PLTFM_PMOPS, 121 .of_match_table = sdhci_dove_of_match_table, 122 }, 123 .probe = sdhci_dove_probe, 124 .remove = sdhci_pltfm_unregister, 125 }; 126 127 module_platform_driver(sdhci_dove_driver); 128 129 MODULE_DESCRIPTION("SDHCI driver for Dove"); 130 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, " 131 "Mike Rapoport <mike@compulab.co.il>"); 132 MODULE_LICENSE("GPL v2"); 133