1 /* 2 * Copyright (C) 2010 Marvell International Ltd. 3 * Zhangfei Gao <zhangfei.gao@marvell.com> 4 * Kevin Wang <dwang4@marvell.com> 5 * Jun Nie <njun@marvell.com> 6 * Qiming Wu <wuqm@marvell.com> 7 * Philip Rakity <prakity@marvell.com> 8 * 9 * This software is licensed under the terms of the GNU General Public 10 * License version 2, as published by the Free Software Foundation, and 11 * may be copied, distributed, and modified under those terms. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 */ 19 20 #include <linux/err.h> 21 #include <linux/init.h> 22 #include <linux/platform_device.h> 23 #include <linux/clk.h> 24 #include <linux/module.h> 25 #include <linux/io.h> 26 #include <linux/gpio.h> 27 #include <linux/mmc/card.h> 28 #include <linux/mmc/host.h> 29 #include <linux/platform_data/pxa_sdhci.h> 30 #include <linux/slab.h> 31 #include <linux/of.h> 32 #include <linux/of_device.h> 33 34 #include "sdhci.h" 35 #include "sdhci-pltfm.h" 36 37 #define SD_FIFO_PARAM 0xe0 38 #define DIS_PAD_SD_CLK_GATE 0x0400 /* Turn on/off Dynamic SD Clock Gating */ 39 #define CLK_GATE_ON 0x0200 /* Disable/enable Clock Gate */ 40 #define CLK_GATE_CTL 0x0100 /* Clock Gate Control */ 41 #define CLK_GATE_SETTING_BITS (DIS_PAD_SD_CLK_GATE | \ 42 CLK_GATE_ON | CLK_GATE_CTL) 43 44 #define SD_CLOCK_BURST_SIZE_SETUP 0xe6 45 #define SDCLK_SEL_SHIFT 8 46 #define SDCLK_SEL_MASK 0x3 47 #define SDCLK_DELAY_SHIFT 10 48 #define SDCLK_DELAY_MASK 0x3c 49 50 #define SD_CE_ATA_2 0xea 51 #define MMC_CARD 0x1000 52 #define MMC_WIDTH 0x0100 53 54 static void pxav2_reset(struct sdhci_host *host, u8 mask) 55 { 56 struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc)); 57 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; 58 59 sdhci_reset(host, mask); 60 61 if (mask == SDHCI_RESET_ALL) { 62 u16 tmp = 0; 63 64 /* 65 * tune timing of read data/command when crc error happen 66 * no performance impact 67 */ 68 if (pdata && pdata->clk_delay_sel == 1) { 69 tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); 70 71 tmp &= ~(SDCLK_DELAY_MASK << SDCLK_DELAY_SHIFT); 72 tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK) 73 << SDCLK_DELAY_SHIFT; 74 tmp &= ~(SDCLK_SEL_MASK << SDCLK_SEL_SHIFT); 75 tmp |= (1 & SDCLK_SEL_MASK) << SDCLK_SEL_SHIFT; 76 77 writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); 78 } 79 80 if (pdata && (pdata->flags & PXA_FLAG_ENABLE_CLOCK_GATING)) { 81 tmp = readw(host->ioaddr + SD_FIFO_PARAM); 82 tmp &= ~CLK_GATE_SETTING_BITS; 83 writew(tmp, host->ioaddr + SD_FIFO_PARAM); 84 } else { 85 tmp = readw(host->ioaddr + SD_FIFO_PARAM); 86 tmp &= ~CLK_GATE_SETTING_BITS; 87 tmp |= CLK_GATE_SETTING_BITS; 88 writew(tmp, host->ioaddr + SD_FIFO_PARAM); 89 } 90 } 91 } 92 93 static void pxav2_mmc_set_bus_width(struct sdhci_host *host, int width) 94 { 95 u8 ctrl; 96 u16 tmp; 97 98 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL); 99 tmp = readw(host->ioaddr + SD_CE_ATA_2); 100 if (width == MMC_BUS_WIDTH_8) { 101 ctrl &= ~SDHCI_CTRL_4BITBUS; 102 tmp |= MMC_CARD | MMC_WIDTH; 103 } else { 104 tmp &= ~(MMC_CARD | MMC_WIDTH); 105 if (width == MMC_BUS_WIDTH_4) 106 ctrl |= SDHCI_CTRL_4BITBUS; 107 else 108 ctrl &= ~SDHCI_CTRL_4BITBUS; 109 } 110 writew(tmp, host->ioaddr + SD_CE_ATA_2); 111 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL); 112 } 113 114 static const struct sdhci_ops pxav2_sdhci_ops = { 115 .set_clock = sdhci_set_clock, 116 .get_max_clock = sdhci_pltfm_clk_get_max_clock, 117 .set_bus_width = pxav2_mmc_set_bus_width, 118 .reset = pxav2_reset, 119 .set_uhs_signaling = sdhci_set_uhs_signaling, 120 }; 121 122 #ifdef CONFIG_OF 123 static const struct of_device_id sdhci_pxav2_of_match[] = { 124 { 125 .compatible = "mrvl,pxav2-mmc", 126 }, 127 {}, 128 }; 129 MODULE_DEVICE_TABLE(of, sdhci_pxav2_of_match); 130 131 static struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev) 132 { 133 struct sdhci_pxa_platdata *pdata; 134 struct device_node *np = dev->of_node; 135 u32 bus_width; 136 u32 clk_delay_cycles; 137 138 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 139 if (!pdata) 140 return NULL; 141 142 if (of_find_property(np, "non-removable", NULL)) 143 pdata->flags |= PXA_FLAG_CARD_PERMANENT; 144 145 of_property_read_u32(np, "bus-width", &bus_width); 146 if (bus_width == 8) 147 pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT; 148 149 of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles); 150 if (clk_delay_cycles > 0) { 151 pdata->clk_delay_sel = 1; 152 pdata->clk_delay_cycles = clk_delay_cycles; 153 } 154 155 return pdata; 156 } 157 #else 158 static inline struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev) 159 { 160 return NULL; 161 } 162 #endif 163 164 static int sdhci_pxav2_probe(struct platform_device *pdev) 165 { 166 struct sdhci_pltfm_host *pltfm_host; 167 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; 168 struct device *dev = &pdev->dev; 169 struct sdhci_host *host = NULL; 170 const struct of_device_id *match; 171 172 int ret; 173 struct clk *clk; 174 175 host = sdhci_pltfm_init(pdev, NULL, 0); 176 if (IS_ERR(host)) 177 return PTR_ERR(host); 178 179 pltfm_host = sdhci_priv(host); 180 181 clk = clk_get(dev, "PXA-SDHCLK"); 182 if (IS_ERR(clk)) { 183 dev_err(dev, "failed to get io clock\n"); 184 ret = PTR_ERR(clk); 185 goto err_clk_get; 186 } 187 pltfm_host->clk = clk; 188 ret = clk_prepare_enable(clk); 189 if (ret) { 190 dev_err(&pdev->dev, "failed to enable io clock\n"); 191 goto err_clk_enable; 192 } 193 194 host->quirks = SDHCI_QUIRK_BROKEN_ADMA 195 | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL 196 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN; 197 198 match = of_match_device(of_match_ptr(sdhci_pxav2_of_match), &pdev->dev); 199 if (match) { 200 pdata = pxav2_get_mmc_pdata(dev); 201 } 202 if (pdata) { 203 if (pdata->flags & PXA_FLAG_CARD_PERMANENT) { 204 /* on-chip device */ 205 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; 206 host->mmc->caps |= MMC_CAP_NONREMOVABLE; 207 } 208 209 /* If slot design supports 8 bit data, indicate this to MMC. */ 210 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT) 211 host->mmc->caps |= MMC_CAP_8_BIT_DATA; 212 213 if (pdata->quirks) 214 host->quirks |= pdata->quirks; 215 if (pdata->host_caps) 216 host->mmc->caps |= pdata->host_caps; 217 if (pdata->pm_caps) 218 host->mmc->pm_caps |= pdata->pm_caps; 219 } 220 221 host->ops = &pxav2_sdhci_ops; 222 223 ret = sdhci_add_host(host); 224 if (ret) { 225 dev_err(&pdev->dev, "failed to add host\n"); 226 goto err_add_host; 227 } 228 229 platform_set_drvdata(pdev, host); 230 231 return 0; 232 233 err_add_host: 234 clk_disable_unprepare(clk); 235 err_clk_enable: 236 clk_put(clk); 237 err_clk_get: 238 sdhci_pltfm_free(pdev); 239 return ret; 240 } 241 242 static int sdhci_pxav2_remove(struct platform_device *pdev) 243 { 244 struct sdhci_host *host = platform_get_drvdata(pdev); 245 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 246 247 sdhci_remove_host(host, 1); 248 249 clk_disable_unprepare(pltfm_host->clk); 250 clk_put(pltfm_host->clk); 251 sdhci_pltfm_free(pdev); 252 253 return 0; 254 } 255 256 static struct platform_driver sdhci_pxav2_driver = { 257 .driver = { 258 .name = "sdhci-pxav2", 259 .of_match_table = of_match_ptr(sdhci_pxav2_of_match), 260 .pm = &sdhci_pltfm_pmops, 261 }, 262 .probe = sdhci_pxav2_probe, 263 .remove = sdhci_pxav2_remove, 264 }; 265 266 module_platform_driver(sdhci_pxav2_driver); 267 268 MODULE_DESCRIPTION("SDHCI driver for pxav2"); 269 MODULE_AUTHOR("Marvell International Ltd."); 270 MODULE_LICENSE("GPL v2"); 271 272