1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC 4 * 5 * Author: Saeed Bishara <saeed@marvell.com> 6 * Mike Rapoport <mike@compulab.co.il> 7 * Based on sdhci-cns3xxx.c 8 */ 9 10 #include <linux/clk.h> 11 #include <linux/err.h> 12 #include <linux/io.h> 13 #include <linux/mmc/host.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 17 #include "sdhci-pltfm.h" 18 19 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg) 20 { 21 u16 ret; 22 23 switch (reg) { 24 case SDHCI_HOST_VERSION: 25 case SDHCI_SLOT_INT_STATUS: 26 /* those registers don't exist */ 27 return 0; 28 default: 29 ret = readw(host->ioaddr + reg); 30 } 31 return ret; 32 } 33 34 static u32 sdhci_dove_readl(struct sdhci_host *host, int reg) 35 { 36 u32 ret; 37 38 ret = readl(host->ioaddr + reg); 39 40 switch (reg) { 41 case SDHCI_CAPABILITIES: 42 /* Mask the support for 3.0V */ 43 ret &= ~SDHCI_CAN_VDD_300; 44 break; 45 } 46 return ret; 47 } 48 49 static const struct sdhci_ops sdhci_dove_ops = { 50 .read_w = sdhci_dove_readw, 51 .read_l = sdhci_dove_readl, 52 .set_clock = sdhci_set_clock, 53 .set_bus_width = sdhci_set_bus_width, 54 .reset = sdhci_reset, 55 .set_uhs_signaling = sdhci_set_uhs_signaling, 56 }; 57 58 static const struct sdhci_pltfm_data sdhci_dove_pdata = { 59 .ops = &sdhci_dove_ops, 60 .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER | 61 SDHCI_QUIRK_NO_BUSY_IRQ | 62 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 63 SDHCI_QUIRK_FORCE_DMA | 64 SDHCI_QUIRK_NO_HISPD_BIT, 65 }; 66 67 static int sdhci_dove_probe(struct platform_device *pdev) 68 { 69 struct sdhci_host *host; 70 struct sdhci_pltfm_host *pltfm_host; 71 int ret; 72 73 host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0); 74 if (IS_ERR(host)) 75 return PTR_ERR(host); 76 77 pltfm_host = sdhci_priv(host); 78 pltfm_host->clk = devm_clk_get(&pdev->dev, NULL); 79 80 if (!IS_ERR(pltfm_host->clk)) 81 clk_prepare_enable(pltfm_host->clk); 82 83 ret = mmc_of_parse(host->mmc); 84 if (ret) 85 goto err_sdhci_add; 86 87 ret = sdhci_add_host(host); 88 if (ret) 89 goto err_sdhci_add; 90 91 return 0; 92 93 err_sdhci_add: 94 clk_disable_unprepare(pltfm_host->clk); 95 sdhci_pltfm_free(pdev); 96 return ret; 97 } 98 99 static const struct of_device_id sdhci_dove_of_match_table[] = { 100 { .compatible = "marvell,dove-sdhci", }, 101 {} 102 }; 103 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table); 104 105 static struct platform_driver sdhci_dove_driver = { 106 .driver = { 107 .name = "sdhci-dove", 108 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 109 .pm = &sdhci_pltfm_pmops, 110 .of_match_table = sdhci_dove_of_match_table, 111 }, 112 .probe = sdhci_dove_probe, 113 .remove = sdhci_pltfm_unregister, 114 }; 115 116 module_platform_driver(sdhci_dove_driver); 117 118 MODULE_DESCRIPTION("SDHCI driver for Dove"); 119 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, " 120 "Mike Rapoport <mike@compulab.co.il>"); 121 MODULE_LICENSE("GPL v2"); 122