1 /* 2 * Synopsys DesignWare Multimedia Card Interface driver 3 * 4 * Copyright (C) 2009 NXP Semiconductors 5 * Copyright (C) 2009, 2010 Imagination Technologies Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 */ 12 13 #include <linux/err.h> 14 #include <linux/interrupt.h> 15 #include <linux/module.h> 16 #include <linux/io.h> 17 #include <linux/irq.h> 18 #include <linux/platform_device.h> 19 #include <linux/slab.h> 20 #include <linux/mmc/host.h> 21 #include <linux/mmc/mmc.h> 22 #include <linux/mmc/dw_mmc.h> 23 #include <linux/of.h> 24 #include <linux/clk.h> 25 26 #include "dw_mmc.h" 27 #include "dw_mmc-pltfm.h" 28 29 #define RK3288_CLKGEN_DIV 2 30 31 static void dw_mci_pltfm_prepare_command(struct dw_mci *host, u32 *cmdr) 32 { 33 *cmdr |= SDMMC_CMD_USE_HOLD_REG; 34 } 35 36 static int dw_mci_rk3288_setup_clock(struct dw_mci *host) 37 { 38 host->bus_hz /= RK3288_CLKGEN_DIV; 39 40 return 0; 41 } 42 43 static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios) 44 { 45 int ret; 46 unsigned int cclkin; 47 u32 bus_hz; 48 49 /* 50 * cclkin: source clock of mmc controller. 51 * bus_hz: card interface clock generated by CLKGEN. 52 * bus_hz = cclkin / RK3288_CLKGEN_DIV; 53 * ios->clock = (div == 0) ? bus_hz : (bus_hz / (2 * div)) 54 * 55 * Note: div can only be 0 or 1 56 * if DDR50 8bit mode(only emmc work in 8bit mode), 57 * div must be set 1 58 */ 59 if ((ios->bus_width == MMC_BUS_WIDTH_8) && 60 (ios->timing == MMC_TIMING_MMC_DDR52)) 61 cclkin = 2 * ios->clock * RK3288_CLKGEN_DIV; 62 else 63 cclkin = ios->clock * RK3288_CLKGEN_DIV; 64 65 ret = clk_set_rate(host->ciu_clk, cclkin); 66 if (ret) 67 dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock); 68 69 bus_hz = clk_get_rate(host->ciu_clk) / RK3288_CLKGEN_DIV; 70 if (bus_hz != host->bus_hz) { 71 host->bus_hz = bus_hz; 72 /* force dw_mci_setup_bus() */ 73 host->current_speed = 0; 74 } 75 } 76 77 static const struct dw_mci_drv_data rk2928_drv_data = { 78 .prepare_command = dw_mci_pltfm_prepare_command, 79 }; 80 81 static const struct dw_mci_drv_data rk3288_drv_data = { 82 .prepare_command = dw_mci_pltfm_prepare_command, 83 .set_ios = dw_mci_rk3288_set_ios, 84 .setup_clock = dw_mci_rk3288_setup_clock, 85 }; 86 87 static const struct dw_mci_drv_data socfpga_drv_data = { 88 .prepare_command = dw_mci_pltfm_prepare_command, 89 }; 90 91 int dw_mci_pltfm_register(struct platform_device *pdev, 92 const struct dw_mci_drv_data *drv_data) 93 { 94 struct dw_mci *host; 95 struct resource *regs; 96 97 host = devm_kzalloc(&pdev->dev, sizeof(struct dw_mci), GFP_KERNEL); 98 if (!host) 99 return -ENOMEM; 100 101 host->irq = platform_get_irq(pdev, 0); 102 if (host->irq < 0) 103 return host->irq; 104 105 host->drv_data = drv_data; 106 host->dev = &pdev->dev; 107 host->irq_flags = 0; 108 host->pdata = pdev->dev.platform_data; 109 110 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 111 host->regs = devm_ioremap_resource(&pdev->dev, regs); 112 if (IS_ERR(host->regs)) 113 return PTR_ERR(host->regs); 114 115 platform_set_drvdata(pdev, host); 116 return dw_mci_probe(host); 117 } 118 EXPORT_SYMBOL_GPL(dw_mci_pltfm_register); 119 120 #ifdef CONFIG_PM_SLEEP 121 /* 122 * TODO: we should probably disable the clock to the card in the suspend path. 123 */ 124 static int dw_mci_pltfm_suspend(struct device *dev) 125 { 126 struct dw_mci *host = dev_get_drvdata(dev); 127 128 return dw_mci_suspend(host); 129 } 130 131 static int dw_mci_pltfm_resume(struct device *dev) 132 { 133 struct dw_mci *host = dev_get_drvdata(dev); 134 135 return dw_mci_resume(host); 136 } 137 #endif /* CONFIG_PM_SLEEP */ 138 139 SIMPLE_DEV_PM_OPS(dw_mci_pltfm_pmops, dw_mci_pltfm_suspend, dw_mci_pltfm_resume); 140 EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops); 141 142 static const struct of_device_id dw_mci_pltfm_match[] = { 143 { .compatible = "snps,dw-mshc", }, 144 { .compatible = "rockchip,rk2928-dw-mshc", 145 .data = &rk2928_drv_data }, 146 { .compatible = "rockchip,rk3288-dw-mshc", 147 .data = &rk3288_drv_data }, 148 { .compatible = "altr,socfpga-dw-mshc", 149 .data = &socfpga_drv_data }, 150 {}, 151 }; 152 MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match); 153 154 static int dw_mci_pltfm_probe(struct platform_device *pdev) 155 { 156 const struct dw_mci_drv_data *drv_data = NULL; 157 const struct of_device_id *match; 158 159 if (pdev->dev.of_node) { 160 match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node); 161 drv_data = match->data; 162 } 163 164 return dw_mci_pltfm_register(pdev, drv_data); 165 } 166 167 int dw_mci_pltfm_remove(struct platform_device *pdev) 168 { 169 struct dw_mci *host = platform_get_drvdata(pdev); 170 171 dw_mci_remove(host); 172 return 0; 173 } 174 EXPORT_SYMBOL_GPL(dw_mci_pltfm_remove); 175 176 static struct platform_driver dw_mci_pltfm_driver = { 177 .probe = dw_mci_pltfm_probe, 178 .remove = dw_mci_pltfm_remove, 179 .driver = { 180 .name = "dw_mmc", 181 .of_match_table = dw_mci_pltfm_match, 182 .pm = &dw_mci_pltfm_pmops, 183 }, 184 }; 185 186 module_platform_driver(dw_mci_pltfm_driver); 187 188 MODULE_DESCRIPTION("DW Multimedia Card Interface driver"); 189 MODULE_AUTHOR("NXP Semiconductor VietNam"); 190 MODULE_AUTHOR("Imagination Technologies Ltd"); 191 MODULE_LICENSE("GPL v2"); 192