1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2010 Marvell International Ltd. 4 * Zhangfei Gao <zhangfei.gao@marvell.com> 5 * Kevin Wang <dwang4@marvell.com> 6 * Jun Nie <njun@marvell.com> 7 * Qiming Wu <wuqm@marvell.com> 8 * Philip Rakity <prakity@marvell.com> 9 */ 10 11 #include <linux/err.h> 12 #include <linux/init.h> 13 #include <linux/platform_device.h> 14 #include <linux/clk.h> 15 #include <linux/module.h> 16 #include <linux/io.h> 17 #include <linux/mmc/card.h> 18 #include <linux/mmc/host.h> 19 #include <linux/platform_data/pxa_sdhci.h> 20 #include <linux/slab.h> 21 #include <linux/of.h> 22 #include <linux/of_device.h> 23 24 #include "sdhci.h" 25 #include "sdhci-pltfm.h" 26 27 #define SD_FIFO_PARAM 0xe0 28 #define DIS_PAD_SD_CLK_GATE 0x0400 /* Turn on/off Dynamic SD Clock Gating */ 29 #define CLK_GATE_ON 0x0200 /* Disable/enable Clock Gate */ 30 #define CLK_GATE_CTL 0x0100 /* Clock Gate Control */ 31 #define CLK_GATE_SETTING_BITS (DIS_PAD_SD_CLK_GATE | \ 32 CLK_GATE_ON | CLK_GATE_CTL) 33 34 #define SD_CLOCK_BURST_SIZE_SETUP 0xe6 35 #define SDCLK_SEL_SHIFT 8 36 #define SDCLK_SEL_MASK 0x3 37 #define SDCLK_DELAY_SHIFT 10 38 #define SDCLK_DELAY_MASK 0x3c 39 40 #define SD_CE_ATA_2 0xea 41 #define MMC_CARD 0x1000 42 #define MMC_WIDTH 0x0100 43 44 static void pxav2_reset(struct sdhci_host *host, u8 mask) 45 { 46 struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc)); 47 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; 48 49 sdhci_reset(host, mask); 50 51 if (mask == SDHCI_RESET_ALL) { 52 u16 tmp = 0; 53 54 /* 55 * tune timing of read data/command when crc error happen 56 * no performance impact 57 */ 58 if (pdata && pdata->clk_delay_sel == 1) { 59 tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); 60 61 tmp &= ~(SDCLK_DELAY_MASK << SDCLK_DELAY_SHIFT); 62 tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK) 63 << SDCLK_DELAY_SHIFT; 64 tmp &= ~(SDCLK_SEL_MASK << SDCLK_SEL_SHIFT); 65 tmp |= (1 & SDCLK_SEL_MASK) << SDCLK_SEL_SHIFT; 66 67 writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); 68 } 69 70 if (pdata && (pdata->flags & PXA_FLAG_ENABLE_CLOCK_GATING)) { 71 tmp = readw(host->ioaddr + SD_FIFO_PARAM); 72 tmp &= ~CLK_GATE_SETTING_BITS; 73 writew(tmp, host->ioaddr + SD_FIFO_PARAM); 74 } else { 75 tmp = readw(host->ioaddr + SD_FIFO_PARAM); 76 tmp &= ~CLK_GATE_SETTING_BITS; 77 tmp |= CLK_GATE_SETTING_BITS; 78 writew(tmp, host->ioaddr + SD_FIFO_PARAM); 79 } 80 } 81 } 82 83 static void pxav2_mmc_set_bus_width(struct sdhci_host *host, int width) 84 { 85 u8 ctrl; 86 u16 tmp; 87 88 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL); 89 tmp = readw(host->ioaddr + SD_CE_ATA_2); 90 if (width == MMC_BUS_WIDTH_8) { 91 ctrl &= ~SDHCI_CTRL_4BITBUS; 92 tmp |= MMC_CARD | MMC_WIDTH; 93 } else { 94 tmp &= ~(MMC_CARD | MMC_WIDTH); 95 if (width == MMC_BUS_WIDTH_4) 96 ctrl |= SDHCI_CTRL_4BITBUS; 97 else 98 ctrl &= ~SDHCI_CTRL_4BITBUS; 99 } 100 writew(tmp, host->ioaddr + SD_CE_ATA_2); 101 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL); 102 } 103 104 static const struct sdhci_ops pxav2_sdhci_ops = { 105 .set_clock = sdhci_set_clock, 106 .get_max_clock = sdhci_pltfm_clk_get_max_clock, 107 .set_bus_width = pxav2_mmc_set_bus_width, 108 .reset = pxav2_reset, 109 .set_uhs_signaling = sdhci_set_uhs_signaling, 110 }; 111 112 #ifdef CONFIG_OF 113 static const struct of_device_id sdhci_pxav2_of_match[] = { 114 { 115 .compatible = "mrvl,pxav2-mmc", 116 }, 117 {}, 118 }; 119 MODULE_DEVICE_TABLE(of, sdhci_pxav2_of_match); 120 121 static struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev) 122 { 123 struct sdhci_pxa_platdata *pdata; 124 struct device_node *np = dev->of_node; 125 u32 bus_width; 126 u32 clk_delay_cycles; 127 128 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 129 if (!pdata) 130 return NULL; 131 132 if (of_find_property(np, "non-removable", NULL)) 133 pdata->flags |= PXA_FLAG_CARD_PERMANENT; 134 135 of_property_read_u32(np, "bus-width", &bus_width); 136 if (bus_width == 8) 137 pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT; 138 139 of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles); 140 if (clk_delay_cycles > 0) { 141 pdata->clk_delay_sel = 1; 142 pdata->clk_delay_cycles = clk_delay_cycles; 143 } 144 145 return pdata; 146 } 147 #else 148 static inline struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev) 149 { 150 return NULL; 151 } 152 #endif 153 154 static int sdhci_pxav2_probe(struct platform_device *pdev) 155 { 156 struct sdhci_pltfm_host *pltfm_host; 157 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; 158 struct device *dev = &pdev->dev; 159 struct sdhci_host *host = NULL; 160 const struct of_device_id *match; 161 162 int ret; 163 struct clk *clk; 164 165 host = sdhci_pltfm_init(pdev, NULL, 0); 166 if (IS_ERR(host)) 167 return PTR_ERR(host); 168 169 pltfm_host = sdhci_priv(host); 170 171 clk = devm_clk_get(dev, "PXA-SDHCLK"); 172 if (IS_ERR(clk)) { 173 dev_err(dev, "failed to get io clock\n"); 174 ret = PTR_ERR(clk); 175 goto free; 176 } 177 pltfm_host->clk = clk; 178 ret = clk_prepare_enable(clk); 179 if (ret) { 180 dev_err(&pdev->dev, "failed to enable io clock\n"); 181 goto free; 182 } 183 184 host->quirks = SDHCI_QUIRK_BROKEN_ADMA 185 | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL 186 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN; 187 188 match = of_match_device(of_match_ptr(sdhci_pxav2_of_match), &pdev->dev); 189 if (match) { 190 pdata = pxav2_get_mmc_pdata(dev); 191 } 192 if (pdata) { 193 if (pdata->flags & PXA_FLAG_CARD_PERMANENT) { 194 /* on-chip device */ 195 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; 196 host->mmc->caps |= MMC_CAP_NONREMOVABLE; 197 } 198 199 /* If slot design supports 8 bit data, indicate this to MMC. */ 200 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT) 201 host->mmc->caps |= MMC_CAP_8_BIT_DATA; 202 203 if (pdata->quirks) 204 host->quirks |= pdata->quirks; 205 if (pdata->host_caps) 206 host->mmc->caps |= pdata->host_caps; 207 if (pdata->pm_caps) 208 host->mmc->pm_caps |= pdata->pm_caps; 209 } 210 211 host->ops = &pxav2_sdhci_ops; 212 213 ret = sdhci_add_host(host); 214 if (ret) 215 goto disable_clk; 216 217 return 0; 218 219 disable_clk: 220 clk_disable_unprepare(clk); 221 free: 222 sdhci_pltfm_free(pdev); 223 return ret; 224 } 225 226 static struct platform_driver sdhci_pxav2_driver = { 227 .driver = { 228 .name = "sdhci-pxav2", 229 .of_match_table = of_match_ptr(sdhci_pxav2_of_match), 230 .pm = &sdhci_pltfm_pmops, 231 }, 232 .probe = sdhci_pxav2_probe, 233 .remove = sdhci_pltfm_unregister, 234 }; 235 236 module_platform_driver(sdhci_pxav2_driver); 237 238 MODULE_DESCRIPTION("SDHCI driver for pxav2"); 239 MODULE_AUTHOR("Marvell International Ltd."); 240 MODULE_LICENSE("GPL v2"); 241 242