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authorAnton Vorontsov <avorontsov@ru.mvista.com>2008-12-30 10:15:28 -0500
committerPierre Ossman <drzeus@drzeus.cx>2008-12-31 13:01:55 -0500
commit9c43df57910bbba540a6cb5c9132302a9ea5f41a (patch)
treea3f7debf605e4ad9a9d61a775222c5b6d738da26 /drivers/mmc
parentc00a46abd4d45a67ff62f4ff6d4f839dff38b877 (diff)
mmc_spi: Add support for OpenFirmware bindings
The support is implemented via platform data accessors, new module (of_mmc_spi) will be created automatically when the driver compiles on OpenFirmware platforms. Link-time dependency will load the module automatically. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/Makefile3
-rw-r--r--drivers/mmc/host/mmc_spi.c4
-rw-r--r--drivers/mmc/host/of_mmc_spi.c149
3 files changed, 155 insertions, 1 deletions
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index c794cc5ce442..f4853288bbb1 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -19,6 +19,9 @@ obj-$(CONFIG_MMC_AT91) += at91_mci.o
19obj-$(CONFIG_MMC_ATMELMCI) += atmel-mci.o 19obj-$(CONFIG_MMC_ATMELMCI) += atmel-mci.o
20obj-$(CONFIG_MMC_TIFM_SD) += tifm_sd.o 20obj-$(CONFIG_MMC_TIFM_SD) += tifm_sd.o
21obj-$(CONFIG_MMC_SPI) += mmc_spi.o 21obj-$(CONFIG_MMC_SPI) += mmc_spi.o
22ifeq ($(CONFIG_OF),y)
23obj-$(CONFIG_MMC_SPI) += of_mmc_spi.o
24endif
22obj-$(CONFIG_MMC_S3C) += s3cmci.o 25obj-$(CONFIG_MMC_S3C) += s3cmci.o
23obj-$(CONFIG_MMC_SDRICOH_CS) += sdricoh_cs.o 26obj-$(CONFIG_MMC_SDRICOH_CS) += sdricoh_cs.o
24obj-$(CONFIG_MMC_TMIO) += tmio_mmc.o 27obj-$(CONFIG_MMC_TMIO) += tmio_mmc.o
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index ad00e1632317..87e211df68ac 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -1285,7 +1285,7 @@ static int mmc_spi_probe(struct spi_device *spi)
1285 /* Platform data is used to hook up things like card sensing 1285 /* Platform data is used to hook up things like card sensing
1286 * and power switching gpios. 1286 * and power switching gpios.
1287 */ 1287 */
1288 host->pdata = spi->dev.platform_data; 1288 host->pdata = mmc_spi_get_pdata(spi);
1289 if (host->pdata) 1289 if (host->pdata)
1290 mmc->ocr_avail = host->pdata->ocr_mask; 1290 mmc->ocr_avail = host->pdata->ocr_mask;
1291 if (!mmc->ocr_avail) { 1291 if (!mmc->ocr_avail) {
@@ -1368,6 +1368,7 @@ fail_glue_init:
1368 1368
1369fail_nobuf1: 1369fail_nobuf1:
1370 mmc_free_host(mmc); 1370 mmc_free_host(mmc);
1371 mmc_spi_put_pdata(spi);
1371 dev_set_drvdata(&spi->dev, NULL); 1372 dev_set_drvdata(&spi->dev, NULL);
1372 1373
1373nomem: 1374nomem:
@@ -1402,6 +1403,7 @@ static int __devexit mmc_spi_remove(struct spi_device *spi)
1402 1403
1403 spi->max_speed_hz = mmc->f_max; 1404 spi->max_speed_hz = mmc->f_max;
1404 mmc_free_host(mmc); 1405 mmc_free_host(mmc);
1406 mmc_spi_put_pdata(spi);
1405 dev_set_drvdata(&spi->dev, NULL); 1407 dev_set_drvdata(&spi->dev, NULL);
1406 } 1408 }
1407 return 0; 1409 return 0;
diff --git a/drivers/mmc/host/of_mmc_spi.c b/drivers/mmc/host/of_mmc_spi.c
new file mode 100644
index 000000000000..fb2921f8099d
--- /dev/null
+++ b/drivers/mmc/host/of_mmc_spi.c
@@ -0,0 +1,149 @@
1/*
2 * OpenFirmware bindings for the MMC-over-SPI driver
3 *
4 * Copyright (c) MontaVista Software, Inc. 2008.
5 *
6 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/device.h>
17#include <linux/gpio.h>
18#include <linux/of.h>
19#include <linux/of_gpio.h>
20#include <linux/spi/spi.h>
21#include <linux/spi/mmc_spi.h>
22#include <linux/mmc/core.h>
23#include <linux/mmc/host.h>
24
25enum {
26 CD_GPIO = 0,
27 WP_GPIO,
28 NUM_GPIOS,
29};
30
31struct of_mmc_spi {
32 int gpios[NUM_GPIOS];
33 bool alow_gpios[NUM_GPIOS];
34 struct mmc_spi_platform_data pdata;
35};
36
37static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
38{
39 return container_of(dev->platform_data, struct of_mmc_spi, pdata);
40}
41
42static int of_mmc_spi_read_gpio(struct device *dev, int gpio_num)
43{
44 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
45 bool active_low = oms->alow_gpios[gpio_num];
46 bool value = gpio_get_value(oms->gpios[gpio_num]);
47
48 return active_low ^ value;
49}
50
51static int of_mmc_spi_get_cd(struct device *dev)
52{
53 return of_mmc_spi_read_gpio(dev, CD_GPIO);
54}
55
56static int of_mmc_spi_get_ro(struct device *dev)
57{
58 return of_mmc_spi_read_gpio(dev, WP_GPIO);
59}
60
61struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
62{
63 struct device *dev = &spi->dev;
64 struct device_node *np = dev_archdata_get_node(&dev->archdata);
65 struct of_mmc_spi *oms;
66 const u32 *voltage_ranges;
67 int num_ranges;
68 int i;
69 int ret = -EINVAL;
70
71 if (dev->platform_data || !np)
72 return dev->platform_data;
73
74 oms = kzalloc(sizeof(*oms), GFP_KERNEL);
75 if (!oms)
76 return NULL;
77
78 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
79 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
80 if (!voltage_ranges || !num_ranges) {
81 dev_err(dev, "OF: voltage-ranges unspecified\n");
82 goto err_ocr;
83 }
84
85 for (i = 0; i < num_ranges; i++) {
86 const int j = i * 2;
87 u32 mask;
88
89 mask = mmc_vddrange_to_ocrmask(voltage_ranges[j],
90 voltage_ranges[j + 1]);
91 if (!mask) {
92 ret = -EINVAL;
93 dev_err(dev, "OF: voltage-range #%d is invalid\n", i);
94 goto err_ocr;
95 }
96 oms->pdata.ocr_mask |= mask;
97 }
98
99 for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
100 enum of_gpio_flags gpio_flags;
101
102 oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags);
103 if (!gpio_is_valid(oms->gpios[i]))
104 continue;
105
106 ret = gpio_request(oms->gpios[i], dev->bus_id);
107 if (ret < 0) {
108 oms->gpios[i] = -EINVAL;
109 continue;
110 }
111
112 if (gpio_flags & OF_GPIO_ACTIVE_LOW)
113 oms->alow_gpios[i] = true;
114 }
115
116 if (gpio_is_valid(oms->gpios[CD_GPIO]))
117 oms->pdata.get_cd = of_mmc_spi_get_cd;
118 if (gpio_is_valid(oms->gpios[WP_GPIO]))
119 oms->pdata.get_ro = of_mmc_spi_get_ro;
120
121 /* We don't support interrupts yet, let's poll. */
122 oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
123
124 dev->platform_data = &oms->pdata;
125 return dev->platform_data;
126err_ocr:
127 kfree(oms);
128 return NULL;
129}
130EXPORT_SYMBOL(mmc_spi_get_pdata);
131
132void mmc_spi_put_pdata(struct spi_device *spi)
133{
134 struct device *dev = &spi->dev;
135 struct device_node *np = dev_archdata_get_node(&dev->archdata);
136 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
137 int i;
138
139 if (!dev->platform_data || !np)
140 return;
141
142 for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
143 if (gpio_is_valid(oms->gpios[i]))
144 gpio_free(oms->gpios[i]);
145 }
146 kfree(oms);
147 dev->platform_data = NULL;
148}
149EXPORT_SYMBOL(mmc_spi_put_pdata);