1 /* 2 * Copyright (C) 2010 Marvell International Ltd. 3 * Zhangfei Gao <zhangfei.gao@marvell.com> 4 * Kevin Wang <dwang4@marvell.com> 5 * Mingwei Wang <mwwang@marvell.com> 6 * Philip Rakity <prakity@marvell.com> 7 * Mark Brown <markb@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 #include <linux/err.h> 20 #include <linux/init.h> 21 #include <linux/platform_device.h> 22 #include <linux/clk.h> 23 #include <linux/io.h> 24 #include <linux/gpio.h> 25 #include <linux/mmc/card.h> 26 #include <linux/mmc/host.h> 27 #include <linux/mmc/slot-gpio.h> 28 #include <linux/platform_data/pxa_sdhci.h> 29 #include <linux/slab.h> 30 #include <linux/delay.h> 31 #include <linux/module.h> 32 #include <linux/of.h> 33 #include <linux/of_device.h> 34 #include <linux/of_gpio.h> 35 36 #include "sdhci.h" 37 #include "sdhci-pltfm.h" 38 39 #define SD_CLOCK_BURST_SIZE_SETUP 0x10A 40 #define SDCLK_SEL 0x100 41 #define SDCLK_DELAY_SHIFT 9 42 #define SDCLK_DELAY_MASK 0x1f 43 44 #define SD_CFG_FIFO_PARAM 0x100 45 #define SDCFG_GEN_PAD_CLK_ON (1<<6) 46 #define SDCFG_GEN_PAD_CLK_CNT_MASK 0xFF 47 #define SDCFG_GEN_PAD_CLK_CNT_SHIFT 24 48 49 #define SD_SPI_MODE 0x108 50 #define SD_CE_ATA_1 0x10C 51 52 #define SD_CE_ATA_2 0x10E 53 #define SDCE_MISC_INT (1<<2) 54 #define SDCE_MISC_INT_EN (1<<1) 55 56 static void pxav3_set_private_registers(struct sdhci_host *host, u8 mask) 57 { 58 struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc)); 59 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; 60 61 if (mask == SDHCI_RESET_ALL) { 62 /* 63 * tune timing of read data/command when crc error happen 64 * no performance impact 65 */ 66 if (pdata && 0 != pdata->clk_delay_cycles) { 67 u16 tmp; 68 69 tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); 70 tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK) 71 << SDCLK_DELAY_SHIFT; 72 tmp |= SDCLK_SEL; 73 writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); 74 } 75 } 76 } 77 78 #define MAX_WAIT_COUNT 5 79 static void pxav3_gen_init_74_clocks(struct sdhci_host *host, u8 power_mode) 80 { 81 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 82 struct sdhci_pxa *pxa = pltfm_host->priv; 83 u16 tmp; 84 int count; 85 86 if (pxa->power_mode == MMC_POWER_UP 87 && power_mode == MMC_POWER_ON) { 88 89 dev_dbg(mmc_dev(host->mmc), 90 "%s: slot->power_mode = %d," 91 "ios->power_mode = %d\n", 92 __func__, 93 pxa->power_mode, 94 power_mode); 95 96 /* set we want notice of when 74 clocks are sent */ 97 tmp = readw(host->ioaddr + SD_CE_ATA_2); 98 tmp |= SDCE_MISC_INT_EN; 99 writew(tmp, host->ioaddr + SD_CE_ATA_2); 100 101 /* start sending the 74 clocks */ 102 tmp = readw(host->ioaddr + SD_CFG_FIFO_PARAM); 103 tmp |= SDCFG_GEN_PAD_CLK_ON; 104 writew(tmp, host->ioaddr + SD_CFG_FIFO_PARAM); 105 106 /* slowest speed is about 100KHz or 10usec per clock */ 107 udelay(740); 108 count = 0; 109 110 while (count++ < MAX_WAIT_COUNT) { 111 if ((readw(host->ioaddr + SD_CE_ATA_2) 112 & SDCE_MISC_INT) == 0) 113 break; 114 udelay(10); 115 } 116 117 if (count == MAX_WAIT_COUNT) 118 dev_warn(mmc_dev(host->mmc), "74 clock interrupt not cleared\n"); 119 120 /* clear the interrupt bit if posted */ 121 tmp = readw(host->ioaddr + SD_CE_ATA_2); 122 tmp |= SDCE_MISC_INT; 123 writew(tmp, host->ioaddr + SD_CE_ATA_2); 124 } 125 pxa->power_mode = power_mode; 126 } 127 128 static int pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs) 129 { 130 u16 ctrl_2; 131 132 /* 133 * Set V18_EN -- UHS modes do not work without this. 134 * does not change signaling voltage 135 */ 136 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 137 138 /* Select Bus Speed Mode for host */ 139 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; 140 switch (uhs) { 141 case MMC_TIMING_UHS_SDR12: 142 ctrl_2 |= SDHCI_CTRL_UHS_SDR12; 143 break; 144 case MMC_TIMING_UHS_SDR25: 145 ctrl_2 |= SDHCI_CTRL_UHS_SDR25; 146 break; 147 case MMC_TIMING_UHS_SDR50: 148 ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180; 149 break; 150 case MMC_TIMING_UHS_SDR104: 151 ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180; 152 break; 153 case MMC_TIMING_UHS_DDR50: 154 ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180; 155 break; 156 } 157 158 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); 159 dev_dbg(mmc_dev(host->mmc), 160 "%s uhs = %d, ctrl_2 = %04X\n", 161 __func__, uhs, ctrl_2); 162 163 return 0; 164 } 165 166 static struct sdhci_ops pxav3_sdhci_ops = { 167 .platform_reset_exit = pxav3_set_private_registers, 168 .set_uhs_signaling = pxav3_set_uhs_signaling, 169 .platform_send_init_74_clocks = pxav3_gen_init_74_clocks, 170 }; 171 172 #ifdef CONFIG_OF 173 static const struct of_device_id sdhci_pxav3_of_match[] = { 174 { 175 .compatible = "mrvl,pxav3-mmc", 176 }, 177 {}, 178 }; 179 MODULE_DEVICE_TABLE(of, sdhci_pxav3_of_match); 180 181 static struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev) 182 { 183 struct sdhci_pxa_platdata *pdata; 184 struct device_node *np = dev->of_node; 185 u32 bus_width; 186 u32 clk_delay_cycles; 187 enum of_gpio_flags gpio_flags; 188 189 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 190 if (!pdata) 191 return NULL; 192 193 if (of_find_property(np, "non-removable", NULL)) 194 pdata->flags |= PXA_FLAG_CARD_PERMANENT; 195 196 of_property_read_u32(np, "bus-width", &bus_width); 197 if (bus_width == 8) 198 pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT; 199 200 of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles); 201 if (clk_delay_cycles > 0) 202 pdata->clk_delay_cycles = clk_delay_cycles; 203 204 pdata->ext_cd_gpio = of_get_named_gpio_flags(np, "cd-gpios", 0, &gpio_flags); 205 if (gpio_flags != OF_GPIO_ACTIVE_LOW) 206 pdata->host_caps2 |= MMC_CAP2_CD_ACTIVE_HIGH; 207 208 return pdata; 209 } 210 #else 211 static inline struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev) 212 { 213 return NULL; 214 } 215 #endif 216 217 static int __devinit sdhci_pxav3_probe(struct platform_device *pdev) 218 { 219 struct sdhci_pltfm_host *pltfm_host; 220 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; 221 struct device *dev = &pdev->dev; 222 struct sdhci_host *host = NULL; 223 struct sdhci_pxa *pxa = NULL; 224 const struct of_device_id *match; 225 226 int ret; 227 struct clk *clk; 228 229 pxa = kzalloc(sizeof(struct sdhci_pxa), GFP_KERNEL); 230 if (!pxa) 231 return -ENOMEM; 232 233 host = sdhci_pltfm_init(pdev, NULL); 234 if (IS_ERR(host)) { 235 kfree(pxa); 236 return PTR_ERR(host); 237 } 238 pltfm_host = sdhci_priv(host); 239 pltfm_host->priv = pxa; 240 241 clk = clk_get(dev, NULL); 242 if (IS_ERR(clk)) { 243 dev_err(dev, "failed to get io clock\n"); 244 ret = PTR_ERR(clk); 245 goto err_clk_get; 246 } 247 pltfm_host->clk = clk; 248 clk_prepare_enable(clk); 249 250 host->quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL 251 | SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC 252 | SDHCI_QUIRK_32BIT_ADMA_SIZE; 253 254 /* enable 1/8V DDR capable */ 255 host->mmc->caps |= MMC_CAP_1_8V_DDR; 256 257 match = of_match_device(of_match_ptr(sdhci_pxav3_of_match), &pdev->dev); 258 if (match) 259 pdata = pxav3_get_mmc_pdata(dev); 260 261 if (pdata) { 262 if (pdata->flags & PXA_FLAG_CARD_PERMANENT) { 263 /* on-chip device */ 264 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; 265 host->mmc->caps |= MMC_CAP_NONREMOVABLE; 266 } 267 268 /* If slot design supports 8 bit data, indicate this to MMC. */ 269 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT) 270 host->mmc->caps |= MMC_CAP_8_BIT_DATA; 271 272 if (pdata->quirks) 273 host->quirks |= pdata->quirks; 274 if (pdata->host_caps) 275 host->mmc->caps |= pdata->host_caps; 276 if (pdata->host_caps2) 277 host->mmc->caps2 |= pdata->host_caps2; 278 if (pdata->pm_caps) 279 host->mmc->pm_caps |= pdata->pm_caps; 280 281 if (gpio_is_valid(pdata->ext_cd_gpio)) { 282 ret = mmc_gpio_request_cd(host->mmc, pdata->ext_cd_gpio); 283 if (ret) { 284 dev_err(mmc_dev(host->mmc), 285 "failed to allocate card detect gpio\n"); 286 goto err_cd_req; 287 } 288 } 289 } 290 291 host->ops = &pxav3_sdhci_ops; 292 293 sdhci_get_of_property(pdev); 294 295 ret = sdhci_add_host(host); 296 if (ret) { 297 dev_err(&pdev->dev, "failed to add host\n"); 298 goto err_add_host; 299 } 300 301 platform_set_drvdata(pdev, host); 302 303 return 0; 304 305 err_add_host: 306 clk_disable_unprepare(clk); 307 clk_put(clk); 308 mmc_gpio_free_cd(host->mmc); 309 err_cd_req: 310 err_clk_get: 311 sdhci_pltfm_free(pdev); 312 kfree(pxa); 313 return ret; 314 } 315 316 static int __devexit sdhci_pxav3_remove(struct platform_device *pdev) 317 { 318 struct sdhci_host *host = platform_get_drvdata(pdev); 319 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 320 struct sdhci_pxa *pxa = pltfm_host->priv; 321 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; 322 323 sdhci_remove_host(host, 1); 324 325 clk_disable_unprepare(pltfm_host->clk); 326 clk_put(pltfm_host->clk); 327 328 if (gpio_is_valid(pdata->ext_cd_gpio)) 329 mmc_gpio_free_cd(host->mmc); 330 331 sdhci_pltfm_free(pdev); 332 kfree(pxa); 333 334 platform_set_drvdata(pdev, NULL); 335 336 return 0; 337 } 338 339 static struct platform_driver sdhci_pxav3_driver = { 340 .driver = { 341 .name = "sdhci-pxav3", 342 #ifdef CONFIG_OF 343 .of_match_table = sdhci_pxav3_of_match, 344 #endif 345 .owner = THIS_MODULE, 346 .pm = SDHCI_PLTFM_PMOPS, 347 }, 348 .probe = sdhci_pxav3_probe, 349 .remove = __devexit_p(sdhci_pxav3_remove), 350 }; 351 352 module_platform_driver(sdhci_pxav3_driver); 353 354 MODULE_DESCRIPTION("SDHCI driver for pxav3"); 355 MODULE_AUTHOR("Marvell International Ltd."); 356 MODULE_LICENSE("GPL v2"); 357 358