1 /*
2  * Freescale eSDHC controller driver.
3  *
4  * Copyright (c) 2007, 2010 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 	int base = reg & ~0x3;
26 	int shift = (reg & 0x2) * 8;
27 
28 	if (unlikely(reg == SDHCI_HOST_VERSION))
29 		ret = in_be32(host->ioaddr + base) & 0xffff;
30 	else
31 		ret = (in_be32(host->ioaddr + base) >> shift) & 0xffff;
32 	return ret;
33 }
34 
35 static u8 esdhc_readb(struct sdhci_host *host, int reg)
36 {
37 	int base = reg & ~0x3;
38 	int shift = (reg & 0x3) * 8;
39 	u8 ret = (in_be32(host->ioaddr + base) >> shift) & 0xff;
40 	return ret;
41 }
42 
43 static void esdhc_writew(struct sdhci_host *host, u16 val, int reg)
44 {
45 	if (reg == SDHCI_BLOCK_SIZE) {
46 		/*
47 		 * Two last DMA bits are reserved, and first one is used for
48 		 * non-standard blksz of 4096 bytes that we don't support
49 		 * yet. So clear the DMA boundary bits.
50 		 */
51 		val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
52 	}
53 	sdhci_be32bs_writew(host, val, reg);
54 }
55 
56 static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
57 {
58 	/* Prevent SDHCI core from writing reserved bits (e.g. HISPD). */
59 	if (reg == SDHCI_HOST_CONTROL)
60 		val &= ~ESDHC_HOST_CONTROL_RES;
61 	sdhci_be32bs_writeb(host, val, reg);
62 }
63 
64 static int esdhc_of_enable_dma(struct sdhci_host *host)
65 {
66 	setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
67 	return 0;
68 }
69 
70 static unsigned int esdhc_of_get_max_clock(struct sdhci_host *host)
71 {
72 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
73 
74 	return pltfm_host->clock;
75 }
76 
77 static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
78 {
79 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
80 
81 	return pltfm_host->clock / 256 / 16;
82 }
83 
84 static struct sdhci_ops sdhci_esdhc_ops = {
85 	.read_l = sdhci_be32bs_readl,
86 	.read_w = esdhc_readw,
87 	.read_b = esdhc_readb,
88 	.write_l = sdhci_be32bs_writel,
89 	.write_w = esdhc_writew,
90 	.write_b = esdhc_writeb,
91 	.set_clock = esdhc_set_clock,
92 	.enable_dma = esdhc_of_enable_dma,
93 	.get_max_clock = esdhc_of_get_max_clock,
94 	.get_min_clock = esdhc_of_get_min_clock,
95 };
96 
97 static struct sdhci_pltfm_data sdhci_esdhc_pdata = {
98 	/* card detection could be handled via GPIO */
99 	.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_CARD_DETECTION
100 		| SDHCI_QUIRK_NO_CARD_NO_RESET,
101 	.ops = &sdhci_esdhc_ops,
102 };
103 
104 static int __devinit sdhci_esdhc_probe(struct platform_device *pdev)
105 {
106 	return sdhci_pltfm_register(pdev, &sdhci_esdhc_pdata);
107 }
108 
109 static int __devexit sdhci_esdhc_remove(struct platform_device *pdev)
110 {
111 	return sdhci_pltfm_unregister(pdev);
112 }
113 
114 static const struct of_device_id sdhci_esdhc_of_match[] = {
115 	{ .compatible = "fsl,mpc8379-esdhc" },
116 	{ .compatible = "fsl,mpc8536-esdhc" },
117 	{ .compatible = "fsl,esdhc" },
118 	{ }
119 };
120 MODULE_DEVICE_TABLE(of, sdhci_esdhc_of_match);
121 
122 static struct platform_driver sdhci_esdhc_driver = {
123 	.driver = {
124 		.name = "sdhci-esdhc",
125 		.owner = THIS_MODULE,
126 		.of_match_table = sdhci_esdhc_of_match,
127 	},
128 	.probe = sdhci_esdhc_probe,
129 	.remove = __devexit_p(sdhci_esdhc_remove),
130 #ifdef CONFIG_PM
131 	.suspend = sdhci_pltfm_suspend,
132 	.resume = sdhci_pltfm_resume,
133 #endif
134 };
135 
136 static int __init sdhci_esdhc_init(void)
137 {
138 	return platform_driver_register(&sdhci_esdhc_driver);
139 }
140 module_init(sdhci_esdhc_init);
141 
142 static void __exit sdhci_esdhc_exit(void)
143 {
144 	platform_driver_unregister(&sdhci_esdhc_driver);
145 }
146 module_exit(sdhci_esdhc_exit);
147 
148 MODULE_DESCRIPTION("SDHCI OF driver for Freescale MPC eSDHC");
149 MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
150 	      "Anton Vorontsov <avorontsov@ru.mvista.com>");
151 MODULE_LICENSE("GPL v2");
152