1 /* 2 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 */ 9 10 #include <linux/module.h> 11 #include <linux/platform_device.h> 12 #include <linux/clk.h> 13 #include <linux/mmc/host.h> 14 #include <linux/mmc/dw_mmc.h> 15 #include <linux/of_address.h> 16 17 #include "dw_mmc.h" 18 #include "dw_mmc-pltfm.h" 19 20 #define RK3288_CLKGEN_DIV 2 21 22 static void dw_mci_rockchip_prepare_command(struct dw_mci *host, u32 *cmdr) 23 { 24 *cmdr |= SDMMC_CMD_USE_HOLD_REG; 25 } 26 27 static int dw_mci_rk3288_setup_clock(struct dw_mci *host) 28 { 29 host->bus_hz /= RK3288_CLKGEN_DIV; 30 31 return 0; 32 } 33 34 static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios) 35 { 36 int ret; 37 unsigned int cclkin; 38 u32 bus_hz; 39 40 if (ios->clock == 0) 41 return; 42 43 /* 44 * cclkin: source clock of mmc controller 45 * bus_hz: card interface clock generated by CLKGEN 46 * bus_hz = cclkin / RK3288_CLKGEN_DIV 47 * ios->clock = (div == 0) ? bus_hz : (bus_hz / (2 * div)) 48 * 49 * Note: div can only be 0 or 1 50 * if DDR50 8bit mode(only emmc work in 8bit mode), 51 * div must be set 1 52 */ 53 if (ios->bus_width == MMC_BUS_WIDTH_8 && 54 ios->timing == MMC_TIMING_MMC_DDR52) 55 cclkin = 2 * ios->clock * RK3288_CLKGEN_DIV; 56 else 57 cclkin = ios->clock * RK3288_CLKGEN_DIV; 58 59 ret = clk_set_rate(host->ciu_clk, cclkin); 60 if (ret) 61 dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock); 62 63 bus_hz = clk_get_rate(host->ciu_clk) / RK3288_CLKGEN_DIV; 64 if (bus_hz != host->bus_hz) { 65 host->bus_hz = bus_hz; 66 /* force dw_mci_setup_bus() */ 67 host->current_speed = 0; 68 } 69 } 70 71 static int dw_mci_rockchip_init(struct dw_mci *host) 72 { 73 /* It is slot 8 on Rockchip SoCs */ 74 host->sdio_id0 = 8; 75 76 return 0; 77 } 78 79 static const struct dw_mci_drv_data rk2928_drv_data = { 80 .prepare_command = dw_mci_rockchip_prepare_command, 81 .init = dw_mci_rockchip_init, 82 }; 83 84 static const struct dw_mci_drv_data rk3288_drv_data = { 85 .prepare_command = dw_mci_rockchip_prepare_command, 86 .set_ios = dw_mci_rk3288_set_ios, 87 .setup_clock = dw_mci_rk3288_setup_clock, 88 .init = dw_mci_rockchip_init, 89 }; 90 91 static const struct of_device_id dw_mci_rockchip_match[] = { 92 { .compatible = "rockchip,rk2928-dw-mshc", 93 .data = &rk2928_drv_data }, 94 { .compatible = "rockchip,rk3288-dw-mshc", 95 .data = &rk3288_drv_data }, 96 {}, 97 }; 98 MODULE_DEVICE_TABLE(of, dw_mci_rockchip_match); 99 100 static int dw_mci_rockchip_probe(struct platform_device *pdev) 101 { 102 const struct dw_mci_drv_data *drv_data; 103 const struct of_device_id *match; 104 105 if (!pdev->dev.of_node) 106 return -ENODEV; 107 108 match = of_match_node(dw_mci_rockchip_match, pdev->dev.of_node); 109 drv_data = match->data; 110 111 return dw_mci_pltfm_register(pdev, drv_data); 112 } 113 114 #ifdef CONFIG_PM_SLEEP 115 static int dw_mci_rockchip_suspend(struct device *dev) 116 { 117 struct dw_mci *host = dev_get_drvdata(dev); 118 119 return dw_mci_suspend(host); 120 } 121 122 static int dw_mci_rockchip_resume(struct device *dev) 123 { 124 struct dw_mci *host = dev_get_drvdata(dev); 125 126 return dw_mci_resume(host); 127 } 128 #endif /* CONFIG_PM_SLEEP */ 129 130 static SIMPLE_DEV_PM_OPS(dw_mci_rockchip_pmops, 131 dw_mci_rockchip_suspend, 132 dw_mci_rockchip_resume); 133 134 static struct platform_driver dw_mci_rockchip_pltfm_driver = { 135 .probe = dw_mci_rockchip_probe, 136 .remove = dw_mci_pltfm_remove, 137 .driver = { 138 .name = "dwmmc_rockchip", 139 .of_match_table = dw_mci_rockchip_match, 140 .pm = &dw_mci_rockchip_pmops, 141 }, 142 }; 143 144 module_platform_driver(dw_mci_rockchip_pltfm_driver); 145 146 MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>"); 147 MODULE_DESCRIPTION("Rockchip Specific DW-MSHC Driver Extension"); 148 MODULE_ALIAS("platform:dwmmc-rockchip"); 149 MODULE_LICENSE("GPL v2"); 150