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 
22 static 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 
33 static 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 
46 static 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 
54 static 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 
60 static 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 
67 static 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 
74 static 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 
87 static 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 
94 static int __devinit sdhci_esdhc_probe(struct platform_device *pdev)
95 {
96 	return sdhci_pltfm_register(pdev, &sdhci_esdhc_pdata);
97 }
98 
99 static int __devexit sdhci_esdhc_remove(struct platform_device *pdev)
100 {
101 	return sdhci_pltfm_unregister(pdev);
102 }
103 
104 static 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 };
110 MODULE_DEVICE_TABLE(of, sdhci_esdhc_of_match);
111 
112 static 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 
126 static int __init sdhci_esdhc_init(void)
127 {
128 	return platform_driver_register(&sdhci_esdhc_driver);
129 }
130 module_init(sdhci_esdhc_init);
131 
132 static void __exit sdhci_esdhc_exit(void)
133 {
134 	platform_driver_unregister(&sdhci_esdhc_driver);
135 }
136 module_exit(sdhci_esdhc_exit);
137 
138 MODULE_DESCRIPTION("SDHCI OF driver for Freescale MPC eSDHC");
139 MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
140 	      "Anton Vorontsov <avorontsov@ru.mvista.com>");
141 MODULE_LICENSE("GPL v2");
142