diff options
author | Viresh KUMAR <viresh.kumar@st.com> | 2010-05-26 17:42:10 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 12:12:40 -0400 |
commit | c63b3cba4f47ef9f4b3f952b4f923cf341d250ac (patch) | |
tree | dc472d6c93cd7878609752ebe74476b0701e0d96 /drivers/mmc | |
parent | 6c1f716e8154ee9315534782b9b1eedea0559a24 (diff) |
sdhci-spear: ST SPEAr based SDHCI controller glue
Add a glue layer to support the sdhci driver on the ST SPEAr platform.
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Cc: <shiraz.hashim@st.com>
Cc: Linus Walleij <linus.ml.walleij@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r-- | drivers/mmc/host/Kconfig | 12 | ||||
-rw-r--r-- | drivers/mmc/host/Makefile | 1 | ||||
-rw-r--r-- | drivers/mmc/host/sdhci-spear.c | 298 |
3 files changed, 311 insertions, 0 deletions
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index aeecbc932fbd..e171e77f6129 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig | |||
@@ -136,6 +136,18 @@ config MMC_SDHCI_S3C | |||
136 | 136 | ||
137 | If unsure, say N. | 137 | If unsure, say N. |
138 | 138 | ||
139 | config MMC_SDHCI_SPEAR | ||
140 | tristate "SDHCI support on ST SPEAr platform" | ||
141 | depends on MMC_SDHCI && PLAT_SPEAR | ||
142 | help | ||
143 | This selects the Secure Digital Host Controller Interface (SDHCI) | ||
144 | often referrered to as the HSMMC block in some of the ST SPEAR range | ||
145 | of SoC | ||
146 | |||
147 | If you have a controller with this interface, say Y or M here. | ||
148 | |||
149 | If unsure, say N. | ||
150 | |||
139 | config MMC_SDHCI_S3C_DMA | 151 | config MMC_SDHCI_S3C_DMA |
140 | bool "DMA support on S3C SDHCI" | 152 | bool "DMA support on S3C SDHCI" |
141 | depends on MMC_SDHCI_S3C && EXPERIMENTAL | 153 | depends on MMC_SDHCI_S3C && EXPERIMENTAL |
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index 2447b66afeb3..e30c2ee48894 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile | |||
@@ -14,6 +14,7 @@ obj-$(CONFIG_MMC_SDHCI) += sdhci.o | |||
14 | obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o | 14 | obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o |
15 | obj-$(CONFIG_MMC_SDHCI_PLTFM) += sdhci-pltfm.o | 15 | obj-$(CONFIG_MMC_SDHCI_PLTFM) += sdhci-pltfm.o |
16 | obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o | 16 | obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o |
17 | obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o | ||
17 | obj-$(CONFIG_MMC_WBSD) += wbsd.o | 18 | obj-$(CONFIG_MMC_WBSD) += wbsd.o |
18 | obj-$(CONFIG_MMC_AU1X) += au1xmmc.o | 19 | obj-$(CONFIG_MMC_AU1X) += au1xmmc.o |
19 | obj-$(CONFIG_MMC_OMAP) += omap.o | 20 | obj-$(CONFIG_MMC_OMAP) += omap.o |
diff --git a/drivers/mmc/host/sdhci-spear.c b/drivers/mmc/host/sdhci-spear.c new file mode 100644 index 000000000000..d70c54c7b70a --- /dev/null +++ b/drivers/mmc/host/sdhci-spear.c | |||
@@ -0,0 +1,298 @@ | |||
1 | /* | ||
2 | * drivers/mmc/host/sdhci-spear.c | ||
3 | * | ||
4 | * Support of SDHCI platform devices for spear soc family | ||
5 | * | ||
6 | * Copyright (C) 2010 ST Microelectronics | ||
7 | * Viresh Kumar<viresh.kumar@st.com> | ||
8 | * | ||
9 | * Inspired by sdhci-pltfm.c | ||
10 | * | ||
11 | * This file is licensed under the terms of the GNU General Public | ||
12 | * License version 2. This program is licensed "as is" without any | ||
13 | * warranty of any kind, whether express or implied. | ||
14 | */ | ||
15 | |||
16 | #include <linux/clk.h> | ||
17 | #include <linux/delay.h> | ||
18 | #include <linux/gpio.h> | ||
19 | #include <linux/highmem.h> | ||
20 | #include <linux/interrupt.h> | ||
21 | #include <linux/irq.h> | ||
22 | #include <linux/platform_device.h> | ||
23 | #include <linux/slab.h> | ||
24 | #include <linux/mmc/host.h> | ||
25 | #include <linux/mmc/sdhci-spear.h> | ||
26 | #include <linux/io.h> | ||
27 | #include "sdhci.h" | ||
28 | |||
29 | struct spear_sdhci { | ||
30 | struct clk *clk; | ||
31 | struct sdhci_plat_data *data; | ||
32 | }; | ||
33 | |||
34 | /* sdhci ops */ | ||
35 | static struct sdhci_ops sdhci_pltfm_ops = { | ||
36 | /* Nothing to do for now. */ | ||
37 | }; | ||
38 | |||
39 | /* gpio card detection interrupt handler */ | ||
40 | static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id) | ||
41 | { | ||
42 | struct platform_device *pdev = dev_id; | ||
43 | struct sdhci_host *host = platform_get_drvdata(pdev); | ||
44 | struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev); | ||
45 | unsigned long gpio_irq_type; | ||
46 | int val; | ||
47 | |||
48 | val = gpio_get_value(sdhci->data->card_int_gpio); | ||
49 | |||
50 | /* val == 1 -> card removed, val == 0 -> card inserted */ | ||
51 | /* if card removed - set irq for low level, else vice versa */ | ||
52 | gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH; | ||
53 | set_irq_type(irq, gpio_irq_type); | ||
54 | |||
55 | if (sdhci->data->card_power_gpio >= 0) { | ||
56 | if (!sdhci->data->power_always_enb) { | ||
57 | /* if card inserted, give power, otherwise remove it */ | ||
58 | val = sdhci->data->power_active_high ? !val : val ; | ||
59 | gpio_set_value(sdhci->data->card_power_gpio, val); | ||
60 | } | ||
61 | } | ||
62 | |||
63 | /* inform sdhci driver about card insertion/removal */ | ||
64 | tasklet_schedule(&host->card_tasklet); | ||
65 | |||
66 | return IRQ_HANDLED; | ||
67 | } | ||
68 | |||
69 | static int __devinit sdhci_probe(struct platform_device *pdev) | ||
70 | { | ||
71 | struct sdhci_host *host; | ||
72 | struct resource *iomem; | ||
73 | struct spear_sdhci *sdhci; | ||
74 | int ret; | ||
75 | |||
76 | BUG_ON(pdev == NULL); | ||
77 | |||
78 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
79 | if (!iomem) { | ||
80 | ret = -ENOMEM; | ||
81 | dev_dbg(&pdev->dev, "memory resource not defined\n"); | ||
82 | goto err; | ||
83 | } | ||
84 | |||
85 | if (!request_mem_region(iomem->start, resource_size(iomem), | ||
86 | "spear-sdhci")) { | ||
87 | ret = -EBUSY; | ||
88 | dev_dbg(&pdev->dev, "cannot request region\n"); | ||
89 | goto err; | ||
90 | } | ||
91 | |||
92 | sdhci = kzalloc(sizeof(*sdhci), GFP_KERNEL); | ||
93 | if (!sdhci) { | ||
94 | ret = -ENOMEM; | ||
95 | dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n"); | ||
96 | goto err_kzalloc; | ||
97 | } | ||
98 | |||
99 | /* clk enable */ | ||
100 | sdhci->clk = clk_get(&pdev->dev, NULL); | ||
101 | if (IS_ERR(sdhci->clk)) { | ||
102 | ret = PTR_ERR(sdhci->clk); | ||
103 | dev_dbg(&pdev->dev, "Error getting clock\n"); | ||
104 | goto err_clk_get; | ||
105 | } | ||
106 | |||
107 | ret = clk_enable(sdhci->clk); | ||
108 | if (ret) { | ||
109 | dev_dbg(&pdev->dev, "Error enabling clock\n"); | ||
110 | goto err_clk_enb; | ||
111 | } | ||
112 | |||
113 | /* overwrite platform_data */ | ||
114 | sdhci->data = dev_get_platdata(&pdev->dev); | ||
115 | pdev->dev.platform_data = sdhci; | ||
116 | |||
117 | if (pdev->dev.parent) | ||
118 | host = sdhci_alloc_host(pdev->dev.parent, 0); | ||
119 | else | ||
120 | host = sdhci_alloc_host(&pdev->dev, 0); | ||
121 | |||
122 | if (IS_ERR(host)) { | ||
123 | ret = PTR_ERR(host); | ||
124 | dev_dbg(&pdev->dev, "error allocating host\n"); | ||
125 | goto err_alloc_host; | ||
126 | } | ||
127 | |||
128 | host->hw_name = "sdhci"; | ||
129 | host->ops = &sdhci_pltfm_ops; | ||
130 | host->irq = platform_get_irq(pdev, 0); | ||
131 | host->quirks = SDHCI_QUIRK_BROKEN_ADMA; | ||
132 | |||
133 | host->ioaddr = ioremap(iomem->start, resource_size(iomem)); | ||
134 | if (!host->ioaddr) { | ||
135 | ret = -ENOMEM; | ||
136 | dev_dbg(&pdev->dev, "failed to remap registers\n"); | ||
137 | goto err_ioremap; | ||
138 | } | ||
139 | |||
140 | ret = sdhci_add_host(host); | ||
141 | if (ret) { | ||
142 | dev_dbg(&pdev->dev, "error adding host\n"); | ||
143 | goto err_add_host; | ||
144 | } | ||
145 | |||
146 | platform_set_drvdata(pdev, host); | ||
147 | |||
148 | /* | ||
149 | * It is optional to use GPIOs for sdhci Power control & sdhci card | ||
150 | * interrupt detection. If sdhci->data is NULL, then use original sdhci | ||
151 | * lines otherwise GPIO lines. | ||
152 | * If GPIO is selected for power control, then power should be disabled | ||
153 | * after card removal and should be enabled when card insertion | ||
154 | * interrupt occurs | ||
155 | */ | ||
156 | if (!sdhci->data) | ||
157 | return 0; | ||
158 | |||
159 | if (sdhci->data->card_power_gpio >= 0) { | ||
160 | int val = 0; | ||
161 | |||
162 | ret = gpio_request(sdhci->data->card_power_gpio, "sdhci"); | ||
163 | if (ret < 0) { | ||
164 | dev_dbg(&pdev->dev, "gpio request fail: %d\n", | ||
165 | sdhci->data->card_power_gpio); | ||
166 | goto err_pgpio_request; | ||
167 | } | ||
168 | |||
169 | if (sdhci->data->power_always_enb) | ||
170 | val = sdhci->data->power_active_high; | ||
171 | else | ||
172 | val = !sdhci->data->power_active_high; | ||
173 | |||
174 | ret = gpio_direction_output(sdhci->data->card_power_gpio, val); | ||
175 | if (ret) { | ||
176 | dev_dbg(&pdev->dev, "gpio set direction fail: %d\n", | ||
177 | sdhci->data->card_power_gpio); | ||
178 | goto err_pgpio_direction; | ||
179 | } | ||
180 | |||
181 | gpio_set_value(sdhci->data->card_power_gpio, 1); | ||
182 | } | ||
183 | |||
184 | if (sdhci->data->card_int_gpio >= 0) { | ||
185 | ret = gpio_request(sdhci->data->card_int_gpio, "sdhci"); | ||
186 | if (ret < 0) { | ||
187 | dev_dbg(&pdev->dev, "gpio request fail: %d\n", | ||
188 | sdhci->data->card_int_gpio); | ||
189 | goto err_igpio_request; | ||
190 | } | ||
191 | |||
192 | ret = gpio_direction_input(sdhci->data->card_int_gpio); | ||
193 | if (ret) { | ||
194 | dev_dbg(&pdev->dev, "gpio set direction fail: %d\n", | ||
195 | sdhci->data->card_int_gpio); | ||
196 | goto err_igpio_direction; | ||
197 | } | ||
198 | ret = request_irq(gpio_to_irq(sdhci->data->card_int_gpio), | ||
199 | sdhci_gpio_irq, IRQF_TRIGGER_LOW, | ||
200 | mmc_hostname(host->mmc), pdev); | ||
201 | if (ret) { | ||
202 | dev_dbg(&pdev->dev, "gpio request irq fail: %d\n", | ||
203 | sdhci->data->card_int_gpio); | ||
204 | goto err_igpio_request_irq; | ||
205 | } | ||
206 | |||
207 | } | ||
208 | |||
209 | return 0; | ||
210 | |||
211 | err_igpio_request_irq: | ||
212 | err_igpio_direction: | ||
213 | if (sdhci->data->card_int_gpio >= 0) | ||
214 | gpio_free(sdhci->data->card_int_gpio); | ||
215 | err_igpio_request: | ||
216 | err_pgpio_direction: | ||
217 | if (sdhci->data->card_power_gpio >= 0) | ||
218 | gpio_free(sdhci->data->card_power_gpio); | ||
219 | err_pgpio_request: | ||
220 | platform_set_drvdata(pdev, NULL); | ||
221 | sdhci_remove_host(host, 1); | ||
222 | err_add_host: | ||
223 | iounmap(host->ioaddr); | ||
224 | err_ioremap: | ||
225 | sdhci_free_host(host); | ||
226 | err_alloc_host: | ||
227 | clk_disable(sdhci->clk); | ||
228 | err_clk_enb: | ||
229 | clk_put(sdhci->clk); | ||
230 | err_clk_get: | ||
231 | kfree(sdhci); | ||
232 | err_kzalloc: | ||
233 | release_mem_region(iomem->start, resource_size(iomem)); | ||
234 | err: | ||
235 | dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret); | ||
236 | return ret; | ||
237 | } | ||
238 | |||
239 | static int __devexit sdhci_remove(struct platform_device *pdev) | ||
240 | { | ||
241 | struct sdhci_host *host = platform_get_drvdata(pdev); | ||
242 | struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
243 | struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev); | ||
244 | int dead; | ||
245 | u32 scratch; | ||
246 | |||
247 | if (sdhci->data) { | ||
248 | if (sdhci->data->card_int_gpio >= 0) { | ||
249 | free_irq(gpio_to_irq(sdhci->data->card_int_gpio), pdev); | ||
250 | gpio_free(sdhci->data->card_int_gpio); | ||
251 | } | ||
252 | |||
253 | if (sdhci->data->card_power_gpio >= 0) | ||
254 | gpio_free(sdhci->data->card_power_gpio); | ||
255 | } | ||
256 | |||
257 | platform_set_drvdata(pdev, NULL); | ||
258 | dead = 0; | ||
259 | scratch = readl(host->ioaddr + SDHCI_INT_STATUS); | ||
260 | if (scratch == (u32)-1) | ||
261 | dead = 1; | ||
262 | |||
263 | sdhci_remove_host(host, dead); | ||
264 | iounmap(host->ioaddr); | ||
265 | sdhci_free_host(host); | ||
266 | clk_disable(sdhci->clk); | ||
267 | clk_put(sdhci->clk); | ||
268 | kfree(sdhci); | ||
269 | if (iomem) | ||
270 | release_mem_region(iomem->start, resource_size(iomem)); | ||
271 | |||
272 | return 0; | ||
273 | } | ||
274 | |||
275 | static struct platform_driver sdhci_driver = { | ||
276 | .driver = { | ||
277 | .name = "sdhci", | ||
278 | .owner = THIS_MODULE, | ||
279 | }, | ||
280 | .probe = sdhci_probe, | ||
281 | .remove = __devexit_p(sdhci_remove), | ||
282 | }; | ||
283 | |||
284 | static int __init sdhci_init(void) | ||
285 | { | ||
286 | return platform_driver_register(&sdhci_driver); | ||
287 | } | ||
288 | module_init(sdhci_init); | ||
289 | |||
290 | static void __exit sdhci_exit(void) | ||
291 | { | ||
292 | platform_driver_unregister(&sdhci_driver); | ||
293 | } | ||
294 | module_exit(sdhci_exit); | ||
295 | |||
296 | MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver"); | ||
297 | MODULE_AUTHOR("Viresh Kumar <viresh.kumar@st.com>"); | ||
298 | MODULE_LICENSE("GPL v2"); | ||