2 * OpenFirmware bindings for Secure Digital Host Controller Interface.
4 * Copyright (c) 2007 Freescale Semiconductor, Inc.
5 * Copyright (c) 2009 MontaVista Software, Inc.
7 * Authors: Xiaobo Xie <X.Xie@freescale.com>
8 * Anton Vorontsov <avorontsov@ru.mvista.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
16 #include <linux/module.h>
17 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/delay.h>
22 #include <linux/of_platform.h>
23 #include <linux/mmc/host.h>
26 struct sdhci_of_data {
31 struct sdhci_of_host {
37 * Ops and quirks for the Freescale eSDHC controller.
40 #define ESDHC_DMA_SYSCTL 0x40c
41 #define ESDHC_DMA_SNOOP 0x00000040
43 #define ESDHC_SYSTEM_CONTROL 0x2c
44 #define ESDHC_CLOCK_MASK 0x0000fff0
45 #define ESDHC_PREDIV_SHIFT 8
46 #define ESDHC_DIVIDER_SHIFT 4
47 #define ESDHC_CLOCK_PEREN 0x00000004
48 #define ESDHC_CLOCK_HCKEN 0x00000002
49 #define ESDHC_CLOCK_IPGEN 0x00000001
51 static u32 esdhc_readl(struct sdhci_host *host, int reg)
53 return in_be32(host->ioaddr + reg);
56 static u16 esdhc_readw(struct sdhci_host *host, int reg)
60 if (unlikely(reg == SDHCI_HOST_VERSION))
61 ret = in_be16(host->ioaddr + reg);
63 ret = in_be16(host->ioaddr + (reg ^ 0x2));
67 static u8 esdhc_readb(struct sdhci_host *host, int reg)
69 return in_8(host->ioaddr + (reg ^ 0x3));
72 static void esdhc_writel(struct sdhci_host *host, u32 val, int reg)
74 out_be32(host->ioaddr + reg, val);
77 static void esdhc_writew(struct sdhci_host *host, u16 val, int reg)
79 struct sdhci_of_host *of_host = sdhci_priv(host);
80 int base = reg & ~0x3;
81 int shift = (reg & 0x2) * 8;
84 case SDHCI_TRANSFER_MODE:
86 * Postpone this write, we must do it together with a
87 * command write that is down below.
89 of_host->xfer_mode_shadow = val;
92 esdhc_writel(host, val << 16 | of_host->xfer_mode_shadow,
95 case SDHCI_BLOCK_SIZE:
97 * Two last DMA bits are reserved, and first one is used for
98 * non-standard blksz of 4096 bytes that we don't support
99 * yet. So clear the DMA boundary bits.
101 val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
104 clrsetbits_be32(host->ioaddr + base, 0xffff << shift, val << shift);
107 static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
109 int base = reg & ~0x3;
110 int shift = (reg & 0x3) * 8;
112 clrsetbits_be32(host->ioaddr + base , 0xff << shift, val << shift);
115 static void esdhc_set_clock(struct sdhci_host *host, unsigned int clock)
120 clrbits32(host->ioaddr + ESDHC_SYSTEM_CONTROL, ESDHC_CLOCK_IPGEN |
121 ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN | ESDHC_CLOCK_MASK);
126 if (host->max_clk / 16 > clock) {
127 for (; pre_div < 256; pre_div *= 2) {
128 if (host->max_clk / pre_div < clock * 16)
133 for (div = 1; div <= 16; div++) {
134 if (host->max_clk / (div * pre_div) <= clock)
140 setbits32(host->ioaddr + ESDHC_SYSTEM_CONTROL, ESDHC_CLOCK_IPGEN |
141 ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN |
142 div << ESDHC_DIVIDER_SHIFT | pre_div << ESDHC_PREDIV_SHIFT);
148 static int esdhc_enable_dma(struct sdhci_host *host)
150 setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
154 static unsigned int esdhc_get_max_clock(struct sdhci_host *host)
156 struct sdhci_of_host *of_host = sdhci_priv(host);
158 return of_host->clock;
161 static unsigned int esdhc_get_timeout_clock(struct sdhci_host *host)
163 struct sdhci_of_host *of_host = sdhci_priv(host);
165 return of_host->clock / 1000;
168 static struct sdhci_of_data sdhci_esdhc = {
169 .quirks = SDHCI_QUIRK_FORCE_BLK_SZ_2048 |
170 SDHCI_QUIRK_BROKEN_CARD_DETECTION |
171 SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
172 SDHCI_QUIRK_NO_BUSY_IRQ |
173 SDHCI_QUIRK_NONSTANDARD_CLOCK |
174 SDHCI_QUIRK_PIO_NEEDS_DELAY |
175 SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET |
176 SDHCI_QUIRK_NO_CARD_NO_RESET,
178 .readl = esdhc_readl,
179 .readw = esdhc_readw,
180 .readb = esdhc_readb,
181 .writel = esdhc_writel,
182 .writew = esdhc_writew,
183 .writeb = esdhc_writeb,
184 .set_clock = esdhc_set_clock,
185 .enable_dma = esdhc_enable_dma,
186 .get_max_clock = esdhc_get_max_clock,
187 .get_timeout_clock = esdhc_get_timeout_clock,
193 static int sdhci_of_suspend(struct of_device *ofdev, pm_message_t state)
195 struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
197 return mmc_suspend_host(host->mmc, state);
200 static int sdhci_of_resume(struct of_device *ofdev)
202 struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
204 return mmc_resume_host(host->mmc);
209 #define sdhci_of_suspend NULL
210 #define sdhci_of_resume NULL
214 static int __devinit sdhci_of_probe(struct of_device *ofdev,
215 const struct of_device_id *match)
217 struct device_node *np = ofdev->node;
218 struct sdhci_of_data *sdhci_of_data = match->data;
219 struct sdhci_host *host;
220 struct sdhci_of_host *of_host;
225 if (!of_device_is_available(np))
228 host = sdhci_alloc_host(&ofdev->dev, sizeof(*of_host));
232 of_host = sdhci_priv(host);
233 dev_set_drvdata(&ofdev->dev, host);
235 host->ioaddr = of_iomap(np, 0);
241 host->irq = irq_of_parse_and_map(np, 0);
247 host->hw_name = dev_name(&ofdev->dev);
249 host->quirks = sdhci_of_data->quirks;
250 host->ops = &sdhci_of_data->ops;
253 clk = of_get_property(np, "clock-frequency", &size);
254 if (clk && size == sizeof(*clk) && *clk)
255 of_host->clock = *clk;
257 ret = sdhci_add_host(host);
264 irq_dispose_mapping(host->irq);
266 iounmap(host->ioaddr);
268 sdhci_free_host(host);
272 static int __devexit sdhci_of_remove(struct of_device *ofdev)
274 struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
276 sdhci_remove_host(host, 0);
277 sdhci_free_host(host);
278 irq_dispose_mapping(host->irq);
279 iounmap(host->ioaddr);
283 static const struct of_device_id sdhci_of_match[] = {
284 { .compatible = "fsl,mpc8379-esdhc", .data = &sdhci_esdhc, },
285 { .compatible = "fsl,mpc8536-esdhc", .data = &sdhci_esdhc, },
286 { .compatible = "fsl,esdhc", .data = &sdhci_esdhc, },
287 { .compatible = "generic-sdhci", },
290 MODULE_DEVICE_TABLE(of, sdhci_of_match);
292 static struct of_platform_driver sdhci_of_driver = {
293 .driver.name = "sdhci-of",
294 .match_table = sdhci_of_match,
295 .probe = sdhci_of_probe,
296 .remove = __devexit_p(sdhci_of_remove),
297 .suspend = sdhci_of_suspend,
298 .resume = sdhci_of_resume,
301 static int __init sdhci_of_init(void)
303 return of_register_platform_driver(&sdhci_of_driver);
305 module_init(sdhci_of_init);
307 static void __exit sdhci_of_exit(void)
309 of_unregister_platform_driver(&sdhci_of_driver);
311 module_exit(sdhci_of_exit);
313 MODULE_DESCRIPTION("Secure Digital Host Controller Interface OF driver");
314 MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
315 "Anton Vorontsov <avorontsov@ru.mvista.com>");
316 MODULE_LICENSE("GPL");