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a702c8ab ZG |
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> | |
8f63795c | 27 | #include <linux/mmc/slot-gpio.h> |
bfed345e | 28 | #include <linux/platform_data/pxa_sdhci.h> |
a702c8ab ZG |
29 | #include <linux/slab.h> |
30 | #include <linux/delay.h> | |
88b47679 | 31 | #include <linux/module.h> |
b650352d CB |
32 | #include <linux/of.h> |
33 | #include <linux/of_device.h> | |
8f63795c | 34 | #include <linux/of_gpio.h> |
b650352d | 35 | |
a702c8ab ZG |
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 | ||
b650352d CB |
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; | |
8f63795c | 187 | enum of_gpio_flags gpio_flags; |
b650352d CB |
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 | ||
8f63795c CB |
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 | ||
b650352d CB |
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 | ||
c3be1efd | 217 | static int sdhci_pxav3_probe(struct platform_device *pdev) |
a702c8ab ZG |
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; | |
b650352d CB |
224 | const struct of_device_id *match; |
225 | ||
a702c8ab ZG |
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 | ||
164378ef | 241 | clk = clk_get(dev, NULL); |
a702c8ab ZG |
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; | |
164378ef | 248 | clk_prepare_enable(clk); |
a702c8ab ZG |
249 | |
250 | host->quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | |
606a15e4 PR |
251 | | SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
252 | | SDHCI_QUIRK_32BIT_ADMA_SIZE; | |
a702c8ab ZG |
253 | |
254 | /* enable 1/8V DDR capable */ | |
255 | host->mmc->caps |= MMC_CAP_1_8V_DDR; | |
256 | ||
b650352d CB |
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 | ||
a702c8ab ZG |
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; | |
8f63795c CB |
276 | if (pdata->host_caps2) |
277 | host->mmc->caps2 |= pdata->host_caps2; | |
a702c8ab ZG |
278 | if (pdata->pm_caps) |
279 | host->mmc->pm_caps |= pdata->pm_caps; | |
8f63795c CB |
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 | } | |
a702c8ab ZG |
289 | } |
290 | ||
291 | host->ops = &pxav3_sdhci_ops; | |
292 | ||
f4f24ade CB |
293 | sdhci_get_of_property(pdev); |
294 | ||
a702c8ab ZG |
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: | |
164378ef | 306 | clk_disable_unprepare(clk); |
a702c8ab | 307 | clk_put(clk); |
8f63795c CB |
308 | mmc_gpio_free_cd(host->mmc); |
309 | err_cd_req: | |
a702c8ab ZG |
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; | |
8f63795c | 321 | struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; |
a702c8ab ZG |
322 | |
323 | sdhci_remove_host(host, 1); | |
324 | ||
164378ef | 325 | clk_disable_unprepare(pltfm_host->clk); |
a702c8ab | 326 | clk_put(pltfm_host->clk); |
8f63795c CB |
327 | |
328 | if (gpio_is_valid(pdata->ext_cd_gpio)) | |
329 | mmc_gpio_free_cd(host->mmc); | |
330 | ||
a702c8ab ZG |
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", | |
b650352d CB |
342 | #ifdef CONFIG_OF |
343 | .of_match_table = sdhci_pxav3_of_match, | |
344 | #endif | |
a702c8ab | 345 | .owner = THIS_MODULE, |
29495aa0 | 346 | .pm = SDHCI_PLTFM_PMOPS, |
a702c8ab ZG |
347 | }, |
348 | .probe = sdhci_pxav3_probe, | |
0433c143 | 349 | .remove = sdhci_pxav3_remove, |
a702c8ab | 350 | }; |
a702c8ab | 351 | |
d1f81a64 | 352 | module_platform_driver(sdhci_pxav3_driver); |
a702c8ab ZG |
353 | |
354 | MODULE_DESCRIPTION("SDHCI driver for pxav3"); | |
355 | MODULE_AUTHOR("Marvell International Ltd."); | |
356 | MODULE_LICENSE("GPL v2"); | |
357 |