aboutsummaryrefslogtreecommitdiff
path: root/drivers/mmc/host/sdhci-of-esdhc.c
blob: 01e5f627e0f047b2a7c63474a931fbedab0a1444 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/*
 * Freescale eSDHC controller driver.
 *
 * Copyright (c) 2007, 2010 Freescale Semiconductor, Inc.
 * Copyright (c) 2009 MontaVista Software, Inc.
 *
 * Authors: Xiaobo Xie <X.Xie@freescale.com>
 *	    Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 */

#include <linux/io.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/mmc/host.h>
#include "sdhci-pltfm.h"
#include "sdhci-esdhc.h"

static u16 esdhc_readw(struct sdhci_host *host, int reg)
{
	u16 ret;
	int base = reg & ~0x3;
	int shift = (reg & 0x2) * 8;

	if (unlikely(reg == SDHCI_HOST_VERSION))
		ret = in_be32(host->ioaddr + base) & 0xffff;
	else
		ret = (in_be32(host->ioaddr + base) >> shift) & 0xffff;
	return ret;
}

static u8 esdhc_readb(struct sdhci_host *host, int reg)
{
	int base = reg & ~0x3;
	int shift = (reg & 0x3) * 8;
	u8 ret = (in_be32(host->ioaddr + base) >> shift) & 0xff;
	return ret;
}

static void esdhc_writew(struct sdhci_host *host, u16 val, int reg)
{
	if (reg == SDHCI_BLOCK_SIZE) {
		/*
		 * Two last DMA bits are reserved, and first one is used for
		 * non-standard blksz of 4096 bytes that we don't support
		 * yet. So clear the DMA boundary bits.
		 */
		val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
	}
	sdhci_be32bs_writew(host, val, reg);
}

static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
{
	/* Prevent SDHCI core from writing reserved bits (e.g. HISPD). */
	if (reg == SDHCI_HOST_CONTROL)
		val &= ~ESDHC_HOST_CONTROL_RES;
	sdhci_be32bs_writeb(host, val, reg);
}

static int esdhc_of_enable_dma(struct sdhci_host *host)
{
	setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
	return 0;
}

static unsigned int esdhc_of_get_max_clock(struct sdhci_host *host)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	return pltfm_host->clock;
}

static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	return pltfm_host->clock / 256 / 16;
}

static struct sdhci_ops sdhci_esdhc_ops = {
	.read_l = sdhci_be32bs_readl,
	.read_w = esdhc_readw,
	.read_b = esdhc_readb,
	.write_l = sdhci_be32bs_writel,
	.write_w = esdhc_writew,
	.write_b = esdhc_writeb,
	.set_clock = esdhc_set_clock,
	.enable_dma = esdhc_of_enable_dma,
	.get_max_clock = esdhc_of_get_max_clock,
	.get_min_clock = esdhc_of_get_min_clock,
};

static struct sdhci_pltfm_data sdhci_esdhc_pdata = {
	/* card detection could be handled via GPIO */
	.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_CARD_DETECTION
		| SDHCI_QUIRK_NO_CARD_NO_RESET,
	.ops = &sdhci_esdhc_ops,
};

static int __devinit sdhci_esdhc_probe(struct platform_device *pdev)
{
	return sdhci_pltfm_register(pdev, &sdhci_esdhc_pdata);
}

static int __devexit sdhci_esdhc_remove(struct platform_device *pdev)
{
	return sdhci_pltfm_unregister(pdev);
}

static const struct of_device_id sdhci_esdhc_of_match[] = {
	{ .compatible = "fsl,mpc8379-esdhc" },
	{ .compatible = "fsl,mpc8536-esdhc" },
	{ .compatible = "fsl,esdhc" },
	{ }
};
MODULE_DEVICE_TABLE(of, sdhci_esdhc_of_match);

static struct platform_driver sdhci_esdhc_driver = {
	.driver = {
		.name = "sdhci-esdhc",
		.owner = THIS_MODULE,
		.of_match_table = sdhci_esdhc_of_match,
		.pm = SDHCI_PLTFM_PMOPS,
	},
	.probe = sdhci_esdhc_probe,
	.remove = __devexit_p(sdhci_esdhc_remove),
};

static int __init sdhci_esdhc_init(void)
{
	return platform_driver_register(&sdhci_esdhc_driver);
}
module_init(sdhci_esdhc_init);

static void __exit sdhci_esdhc_exit(void)
{
	platform_driver_unregister(&sdhci_esdhc_driver);
}
module_exit(sdhci_esdhc_exit);

MODULE_DESCRIPTION("SDHCI OF driver for Freescale MPC eSDHC");
MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
	      "Anton Vorontsov <avorontsov@ru.mvista.com>");
MODULE_LICENSE("GPL v2");