tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Freescale eSDHC controller driver.
3 *
4 * Copyright (c) 2007 Freescale Semiconductor, Inc.
5 * Copyright (c) 2009 MontaVista Software, Inc.
6 *
7 * Authors: Xiaobo Xie <X.Xie@freescale.com>
8 * Anton Vorontsov <avorontsov@ru.mvista.com>
9 *
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.
14 */
15
16#include <linux/io.h>
17#include <linux/delay.h>
18#include <linux/mmc/host.h>
19#include "sdhci-pltfm.h"
20#include "sdhci-esdhc.h"
21
22static u16 esdhc_readw(struct sdhci_host *host, int reg)
23{
24 u16 ret;
25
26 if (unlikely(reg == SDHCI_HOST_VERSION))
27 ret = in_be16(host->ioaddr + reg);
28 else
29 ret = sdhci_be32bs_readw(host, reg);
30 return ret;
31}
32
33static void esdhc_writew(struct sdhci_host *host, u16 val, int reg)
34{
35 if (reg == SDHCI_BLOCK_SIZE) {
36 /*
37 * Two last DMA bits are reserved, and first one is used for
38 * non-standard blksz of 4096 bytes that we don't support
39 * yet. So clear the DMA boundary bits.
40 */
41 val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
42 }
43 sdhci_be32bs_writew(host, val, reg);
44}
45
46static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
47{
48 /* Prevent SDHCI core from writing reserved bits (e.g. HISPD). */
49 if (reg == SDHCI_HOST_CONTROL)
50 val &= ~ESDHC_HOST_CONTROL_RES;
51 sdhci_be32bs_writeb(host, val, reg);
52}
53
54static int esdhc_of_enable_dma(struct sdhci_host *host)
55{
56 setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
57 return 0;
58}
59
60static unsigned int esdhc_of_get_max_clock(struct sdhci_host *host)
61{
62 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
63
64 return pltfm_host->clock;
65}
66
67static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
68{
69 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
70
71 return pltfm_host->clock / 256 / 16;
72}
73
74static struct sdhci_ops sdhci_esdhc_ops = {
75 .read_l = sdhci_be32bs_readl,
76 .read_w = esdhc_readw,
77 .read_b = sdhci_be32bs_readb,
78 .write_l = sdhci_be32bs_writel,
79 .write_w = esdhc_writew,
80 .write_b = esdhc_writeb,
81 .set_clock = esdhc_set_clock,
82 .enable_dma = esdhc_of_enable_dma,
83 .get_max_clock = esdhc_of_get_max_clock,
84 .get_min_clock = esdhc_of_get_min_clock,
85};
86
87static struct sdhci_pltfm_data sdhci_esdhc_pdata = {
88 /* card detection could be handled via GPIO */
89 .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_CARD_DETECTION
90 | SDHCI_QUIRK_NO_CARD_NO_RESET,
91 .ops = &sdhci_esdhc_ops,
92};
93
94static int __devinit sdhci_esdhc_probe(struct platform_device *pdev)
95{
96 return sdhci_pltfm_register(pdev, &sdhci_esdhc_pdata);
97}
98
99static int __devexit sdhci_esdhc_remove(struct platform_device *pdev)
100{
101 return sdhci_pltfm_unregister(pdev);
102}
103
104static const struct of_device_id sdhci_esdhc_of_match[] = {
105 { .compatible = "fsl,mpc8379-esdhc" },
106 { .compatible = "fsl,mpc8536-esdhc" },
107 { .compatible = "fsl,esdhc" },
108 { }
109};
110MODULE_DEVICE_TABLE(of, sdhci_esdhc_of_match);
111
112static struct platform_driver sdhci_esdhc_driver = {
113 .driver = {
114 .name = "sdhci-esdhc",
115 .owner = THIS_MODULE,
116 .of_match_table = sdhci_esdhc_of_match,
117 },
118 .probe = sdhci_esdhc_probe,
119 .remove = __devexit_p(sdhci_esdhc_remove),
120#ifdef CONFIG_PM
121 .suspend = sdhci_pltfm_suspend,
122 .resume = sdhci_pltfm_resume,
123#endif
124};
125
126static int __init sdhci_esdhc_init(void)
127{
128 return platform_driver_register(&sdhci_esdhc_driver);
129}
130module_init(sdhci_esdhc_init);
131
132static void __exit sdhci_esdhc_exit(void)
133{
134 platform_driver_unregister(&sdhci_esdhc_driver);
135}
136module_exit(sdhci_esdhc_exit);
137
138MODULE_DESCRIPTION("SDHCI OF driver for Freescale MPC eSDHC");
139MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
140 "Anton Vorontsov <avorontsov@ru.mvista.com>");
141MODULE_LICENSE("GPL v2");