Christian Daudt | 01ebea1 | 2013-06-20 14:26:37 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 Broadcom Corporation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License as |
| 6 | * published by the Free Software Foundation version 2. |
| 7 | * |
| 8 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| 9 | * kind, whether express or implied; without even the implied warranty |
| 10 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/highmem.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | #include <linux/mmc/host.h> |
| 20 | #include <linux/io.h> |
| 21 | #include <linux/gpio.h> |
| 22 | #include <linux/clk.h> |
| 23 | #include <linux/regulator/consumer.h> |
| 24 | #include <linux/of.h> |
| 25 | #include <linux/of_device.h> |
| 26 | #include <linux/of_gpio.h> |
Christian Daudt | 01ebea1 | 2013-06-20 14:26:37 -0700 | [diff] [blame] | 27 | #include <linux/mmc/slot-gpio.h> |
| 28 | |
| 29 | #include "sdhci-pltfm.h" |
| 30 | #include "sdhci.h" |
| 31 | |
| 32 | #define SDHCI_SOFT_RESET 0x01000000 |
| 33 | #define KONA_SDHOST_CORECTRL 0x8000 |
| 34 | #define KONA_SDHOST_CD_PINCTRL 0x00000008 |
| 35 | #define KONA_SDHOST_STOP_HCLK 0x00000004 |
| 36 | #define KONA_SDHOST_RESET 0x00000002 |
| 37 | #define KONA_SDHOST_EN 0x00000001 |
| 38 | |
| 39 | #define KONA_SDHOST_CORESTAT 0x8004 |
| 40 | #define KONA_SDHOST_WP 0x00000002 |
| 41 | #define KONA_SDHOST_CD_SW 0x00000001 |
| 42 | |
| 43 | #define KONA_SDHOST_COREIMR 0x8008 |
| 44 | #define KONA_SDHOST_IP 0x00000001 |
| 45 | |
| 46 | #define KONA_SDHOST_COREISR 0x800C |
| 47 | #define KONA_SDHOST_COREIMSR 0x8010 |
| 48 | #define KONA_SDHOST_COREDBG1 0x8014 |
| 49 | #define KONA_SDHOST_COREGPO_MASK 0x8018 |
| 50 | |
| 51 | #define SD_DETECT_GPIO_DEBOUNCE_128MS 128 |
| 52 | |
| 53 | #define KONA_MMC_AUTOSUSPEND_DELAY (50) |
| 54 | |
| 55 | struct sdhci_bcm_kona_dev { |
| 56 | struct mutex write_lock; /* protect back to back writes */ |
| 57 | }; |
| 58 | |
| 59 | |
| 60 | static int sdhci_bcm_kona_sd_reset(struct sdhci_host *host) |
| 61 | { |
| 62 | unsigned int val; |
| 63 | unsigned long timeout; |
| 64 | |
| 65 | /* This timeout should be sufficent for core to reset */ |
| 66 | timeout = jiffies + msecs_to_jiffies(100); |
| 67 | |
| 68 | /* reset the host using the top level reset */ |
| 69 | val = sdhci_readl(host, KONA_SDHOST_CORECTRL); |
| 70 | val |= KONA_SDHOST_RESET; |
| 71 | sdhci_writel(host, val, KONA_SDHOST_CORECTRL); |
| 72 | |
| 73 | while (!(sdhci_readl(host, KONA_SDHOST_CORECTRL) & KONA_SDHOST_RESET)) { |
| 74 | if (time_is_before_jiffies(timeout)) { |
| 75 | pr_err("Error: sd host is stuck in reset!!!\n"); |
| 76 | return -EFAULT; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | /* bring the host out of reset */ |
| 81 | val = sdhci_readl(host, KONA_SDHOST_CORECTRL); |
| 82 | val &= ~KONA_SDHOST_RESET; |
| 83 | |
| 84 | /* |
| 85 | * Back-to-Back register write needs a delay of 1ms at bootup (min 10uS) |
| 86 | * Back-to-Back writes to same register needs delay when SD bus clock |
| 87 | * is very low w.r.t AHB clock, mainly during boot-time and during card |
| 88 | * insert-removal. |
| 89 | */ |
| 90 | usleep_range(1000, 5000); |
| 91 | sdhci_writel(host, val, KONA_SDHOST_CORECTRL); |
| 92 | |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | static void sdhci_bcm_kona_sd_init(struct sdhci_host *host) |
| 97 | { |
| 98 | unsigned int val; |
| 99 | |
| 100 | /* enable the interrupt from the IP core */ |
| 101 | val = sdhci_readl(host, KONA_SDHOST_COREIMR); |
| 102 | val |= KONA_SDHOST_IP; |
| 103 | sdhci_writel(host, val, KONA_SDHOST_COREIMR); |
| 104 | |
| 105 | /* Enable the AHB clock gating module to the host */ |
| 106 | val = sdhci_readl(host, KONA_SDHOST_CORECTRL); |
| 107 | val |= KONA_SDHOST_EN; |
| 108 | |
| 109 | /* |
| 110 | * Back-to-Back register write needs a delay of 1ms at bootup (min 10uS) |
| 111 | * Back-to-Back writes to same register needs delay when SD bus clock |
| 112 | * is very low w.r.t AHB clock, mainly during boot-time and during card |
| 113 | * insert-removal. |
| 114 | */ |
| 115 | usleep_range(1000, 5000); |
| 116 | sdhci_writel(host, val, KONA_SDHOST_CORECTRL); |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * Software emulation of the SD card insertion/removal. Set insert=1 for insert |
| 121 | * and insert=0 for removal. The card detection is done by GPIO. For Broadcom |
| 122 | * IP to function properly the bit 0 of CORESTAT register needs to be set/reset |
| 123 | * to generate the CD IRQ handled in sdhci.c which schedules card_tasklet. |
| 124 | */ |
| 125 | static int sdhci_bcm_kona_sd_card_emulate(struct sdhci_host *host, int insert) |
| 126 | { |
| 127 | struct sdhci_pltfm_host *pltfm_priv = sdhci_priv(host); |
| 128 | struct sdhci_bcm_kona_dev *kona_dev = sdhci_pltfm_priv(pltfm_priv); |
| 129 | u32 val; |
| 130 | |
| 131 | /* |
| 132 | * Back-to-Back register write needs a delay of min 10uS. |
| 133 | * Back-to-Back writes to same register needs delay when SD bus clock |
| 134 | * is very low w.r.t AHB clock, mainly during boot-time and during card |
| 135 | * insert-removal. |
| 136 | * We keep 20uS |
| 137 | */ |
| 138 | mutex_lock(&kona_dev->write_lock); |
| 139 | udelay(20); |
| 140 | val = sdhci_readl(host, KONA_SDHOST_CORESTAT); |
| 141 | |
| 142 | if (insert) { |
| 143 | int ret; |
| 144 | |
| 145 | ret = mmc_gpio_get_ro(host->mmc); |
| 146 | if (ret >= 0) |
| 147 | val = (val & ~KONA_SDHOST_WP) | |
| 148 | ((ret) ? KONA_SDHOST_WP : 0); |
| 149 | |
| 150 | val |= KONA_SDHOST_CD_SW; |
| 151 | sdhci_writel(host, val, KONA_SDHOST_CORESTAT); |
| 152 | } else { |
| 153 | val &= ~KONA_SDHOST_CD_SW; |
| 154 | sdhci_writel(host, val, KONA_SDHOST_CORESTAT); |
| 155 | } |
| 156 | mutex_unlock(&kona_dev->write_lock); |
| 157 | |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * SD card interrupt event callback |
| 163 | */ |
Sachin Kamat | ceb2ea1 | 2013-07-08 11:41:53 +0530 | [diff] [blame] | 164 | static void sdhci_bcm_kona_card_event(struct sdhci_host *host) |
Christian Daudt | 01ebea1 | 2013-06-20 14:26:37 -0700 | [diff] [blame] | 165 | { |
| 166 | if (mmc_gpio_get_cd(host->mmc) > 0) { |
| 167 | dev_dbg(mmc_dev(host->mmc), |
| 168 | "card inserted\n"); |
| 169 | sdhci_bcm_kona_sd_card_emulate(host, 1); |
| 170 | } else { |
| 171 | dev_dbg(mmc_dev(host->mmc), |
| 172 | "card removed\n"); |
| 173 | sdhci_bcm_kona_sd_card_emulate(host, 0); |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Get the base clock. Use central clock source for now. Not sure if different |
| 179 | * clock speed to each dev is allowed |
| 180 | */ |
| 181 | static unsigned int sdhci_bcm_kona_get_max_clk(struct sdhci_host *host) |
| 182 | { |
| 183 | struct sdhci_bcm_kona_dev *kona_dev; |
| 184 | struct sdhci_pltfm_host *pltfm_priv = sdhci_priv(host); |
| 185 | kona_dev = sdhci_pltfm_priv(pltfm_priv); |
| 186 | |
| 187 | return host->mmc->f_max; |
| 188 | } |
| 189 | |
| 190 | static unsigned int sdhci_bcm_kona_get_timeout_clock(struct sdhci_host *host) |
| 191 | { |
| 192 | return sdhci_bcm_kona_get_max_clk(host); |
| 193 | } |
| 194 | |
| 195 | static void sdhci_bcm_kona_init_74_clocks(struct sdhci_host *host, |
| 196 | u8 power_mode) |
| 197 | { |
| 198 | /* |
| 199 | * JEDEC and SD spec specify supplying 74 continuous clocks to |
| 200 | * device after power up. With minimum bus (100KHz) that |
| 201 | * that translates to 740us |
| 202 | */ |
| 203 | if (power_mode != MMC_POWER_OFF) |
| 204 | udelay(740); |
| 205 | } |
| 206 | |
| 207 | static struct sdhci_ops sdhci_bcm_kona_ops = { |
| 208 | .get_max_clock = sdhci_bcm_kona_get_max_clk, |
| 209 | .get_timeout_clock = sdhci_bcm_kona_get_timeout_clock, |
| 210 | .platform_send_init_74_clocks = sdhci_bcm_kona_init_74_clocks, |
| 211 | .card_event = sdhci_bcm_kona_card_event, |
| 212 | }; |
| 213 | |
| 214 | static struct sdhci_pltfm_data sdhci_pltfm_data_kona = { |
| 215 | .ops = &sdhci_bcm_kona_ops, |
| 216 | .quirks = SDHCI_QUIRK_NO_CARD_NO_RESET | |
| 217 | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | SDHCI_QUIRK_32BIT_DMA_ADDR | |
| 218 | SDHCI_QUIRK_32BIT_DMA_SIZE | SDHCI_QUIRK_32BIT_ADMA_SIZE | |
| 219 | SDHCI_QUIRK_FORCE_BLK_SZ_2048 | |
| 220 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, |
| 221 | }; |
| 222 | |
Markus Mayer | 058feb5 | 2013-08-07 15:39:59 -0700 | [diff] [blame] | 223 | static struct __initconst of_device_id sdhci_bcm_kona_of_match[] = { |
Christian Daudt | aea237b | 2013-08-20 08:37:19 -0700 | [diff] [blame] | 224 | { .compatible = "brcm,kona-sdhci"}, |
| 225 | { .compatible = "bcm,kona-sdhci"}, /* deprecated name */ |
Christian Daudt | 01ebea1 | 2013-06-20 14:26:37 -0700 | [diff] [blame] | 226 | {} |
| 227 | }; |
| 228 | MODULE_DEVICE_TABLE(of, sdhci_bcm_kona_of_match); |
| 229 | |
Markus Mayer | 058feb5 | 2013-08-07 15:39:59 -0700 | [diff] [blame] | 230 | static int sdhci_bcm_kona_probe(struct platform_device *pdev) |
Christian Daudt | 01ebea1 | 2013-06-20 14:26:37 -0700 | [diff] [blame] | 231 | { |
| 232 | struct sdhci_bcm_kona_dev *kona_dev = NULL; |
| 233 | struct sdhci_pltfm_host *pltfm_priv; |
| 234 | struct device *dev = &pdev->dev; |
| 235 | struct sdhci_host *host; |
| 236 | int ret; |
| 237 | |
| 238 | ret = 0; |
| 239 | |
| 240 | host = sdhci_pltfm_init(pdev, &sdhci_pltfm_data_kona, |
| 241 | sizeof(*kona_dev)); |
| 242 | if (IS_ERR(host)) |
| 243 | return PTR_ERR(host); |
| 244 | |
| 245 | dev_dbg(dev, "%s: inited. IOADDR=%p\n", __func__, host->ioaddr); |
| 246 | |
| 247 | pltfm_priv = sdhci_priv(host); |
| 248 | |
| 249 | kona_dev = sdhci_pltfm_priv(pltfm_priv); |
| 250 | mutex_init(&kona_dev->write_lock); |
| 251 | |
| 252 | mmc_of_parse(host->mmc); |
| 253 | |
| 254 | if (!host->mmc->f_max) { |
| 255 | dev_err(&pdev->dev, "Missing max-freq for SDHCI cfg\n"); |
| 256 | ret = -ENXIO; |
| 257 | goto err_pltfm_free; |
| 258 | } |
| 259 | |
| 260 | dev_dbg(dev, "non-removable=%c\n", |
| 261 | (host->mmc->caps & MMC_CAP_NONREMOVABLE) ? 'Y' : 'N'); |
| 262 | dev_dbg(dev, "cd_gpio %c, wp_gpio %c\n", |
| 263 | (mmc_gpio_get_cd(host->mmc) != -ENOSYS) ? 'Y' : 'N', |
| 264 | (mmc_gpio_get_ro(host->mmc) != -ENOSYS) ? 'Y' : 'N'); |
| 265 | |
Christian Daudt | cf68b62 | 2013-08-02 15:32:27 -0700 | [diff] [blame] | 266 | if (host->mmc->caps & MMC_CAP_NONREMOVABLE) |
Christian Daudt | 01ebea1 | 2013-06-20 14:26:37 -0700 | [diff] [blame] | 267 | host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; |
| 268 | |
| 269 | dev_dbg(dev, "is_8bit=%c\n", |
| 270 | (host->mmc->caps | MMC_CAP_8_BIT_DATA) ? 'Y' : 'N'); |
| 271 | |
| 272 | ret = sdhci_bcm_kona_sd_reset(host); |
| 273 | if (ret) |
| 274 | goto err_pltfm_free; |
| 275 | |
| 276 | sdhci_bcm_kona_sd_init(host); |
| 277 | |
| 278 | ret = sdhci_add_host(host); |
| 279 | if (ret) { |
| 280 | dev_err(dev, "Failed sdhci_add_host\n"); |
| 281 | goto err_reset; |
| 282 | } |
| 283 | |
| 284 | /* if device is eMMC, emulate card insert right here */ |
Christian Daudt | cf68b62 | 2013-08-02 15:32:27 -0700 | [diff] [blame] | 285 | if (host->mmc->caps & MMC_CAP_NONREMOVABLE) { |
Christian Daudt | 01ebea1 | 2013-06-20 14:26:37 -0700 | [diff] [blame] | 286 | ret = sdhci_bcm_kona_sd_card_emulate(host, 1); |
| 287 | if (ret) { |
| 288 | dev_err(dev, |
| 289 | "unable to emulate card insertion\n"); |
| 290 | goto err_remove_host; |
| 291 | } |
| 292 | } |
| 293 | /* |
| 294 | * Since the card detection GPIO interrupt is configured to be |
| 295 | * edge sensitive, check the initial GPIO value here, emulate |
| 296 | * only if the card is present |
| 297 | */ |
| 298 | if (mmc_gpio_get_cd(host->mmc) > 0) |
| 299 | sdhci_bcm_kona_sd_card_emulate(host, 1); |
| 300 | |
| 301 | dev_dbg(dev, "initialized properly\n"); |
| 302 | return 0; |
| 303 | |
| 304 | err_remove_host: |
| 305 | sdhci_remove_host(host, 0); |
| 306 | |
| 307 | err_reset: |
| 308 | sdhci_bcm_kona_sd_reset(host); |
| 309 | |
| 310 | err_pltfm_free: |
| 311 | sdhci_pltfm_free(pdev); |
| 312 | |
| 313 | dev_err(dev, "Probing of sdhci-pltfm failed: %d\n", ret); |
| 314 | return ret; |
| 315 | } |
| 316 | |
| 317 | static int __exit sdhci_bcm_kona_remove(struct platform_device *pdev) |
| 318 | { |
Axel Lin | ff1acfd | 2013-09-17 15:59:32 +0800 | [diff] [blame] | 319 | return sdhci_pltfm_unregister(pdev); |
Christian Daudt | 01ebea1 | 2013-06-20 14:26:37 -0700 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | static struct platform_driver sdhci_bcm_kona_driver = { |
| 323 | .driver = { |
| 324 | .name = "sdhci-kona", |
| 325 | .owner = THIS_MODULE, |
| 326 | .pm = SDHCI_PLTFM_PMOPS, |
Markus Mayer | 058feb5 | 2013-08-07 15:39:59 -0700 | [diff] [blame] | 327 | .of_match_table = sdhci_bcm_kona_of_match, |
Christian Daudt | 01ebea1 | 2013-06-20 14:26:37 -0700 | [diff] [blame] | 328 | }, |
| 329 | .probe = sdhci_bcm_kona_probe, |
Markus Mayer | 058feb5 | 2013-08-07 15:39:59 -0700 | [diff] [blame] | 330 | .remove = sdhci_bcm_kona_remove, |
Christian Daudt | 01ebea1 | 2013-06-20 14:26:37 -0700 | [diff] [blame] | 331 | }; |
| 332 | module_platform_driver(sdhci_bcm_kona_driver); |
| 333 | |
| 334 | MODULE_DESCRIPTION("SDHCI driver for Broadcom Kona platform"); |
| 335 | MODULE_AUTHOR("Broadcom"); |
| 336 | MODULE_LICENSE("GPL v2"); |