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/module.h>
19 #include <linux/mmc/host.h>
20 #include "sdhci-pltfm.h"
21 #include "sdhci-esdhc.h"
22 
23 static u16 esdhc_readw(struct sdhci_host *host, int reg)
24 {
25 	u16 ret;
26 	int base = reg & ~0x3;
27 	int shift = (reg & 0x2) * 8;
28 
29 	if (unlikely(reg == SDHCI_HOST_VERSION))
30 		ret = in_be32(host->ioaddr + base) & 0xffff;
31 	else
32 		ret = (in_be32(host->ioaddr + base) >> shift) & 0xffff;
33 	return ret;
34 }
35 
36 static u8 esdhc_readb(struct sdhci_host *host, int reg)
37 {
38 	int base = reg & ~0x3;
39 	int shift = (reg & 0x3) * 8;
40 	u8 ret = (in_be32(host->ioaddr + base) >> shift) & 0xff;
41 	return ret;
42 }
43 
44 static void esdhc_writew(struct sdhci_host *host, u16 val, int reg)
45 {
46 	if (reg == SDHCI_BLOCK_SIZE) {
47 		/*
48 		 * Two last DMA bits are reserved, and first one is used for
49 		 * non-standard blksz of 4096 bytes that we don't support
50 		 * yet. So clear the DMA boundary bits.
51 		 */
52 		val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
53 	}
54 	sdhci_be32bs_writew(host, val, reg);
55 }
56 
57 static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
58 {
59 	/* Prevent SDHCI core from writing reserved bits (e.g. HISPD). */
60 	if (reg == SDHCI_HOST_CONTROL)
61 		val &= ~ESDHC_HOST_CONTROL_RES;
62 	sdhci_be32bs_writeb(host, val, reg);
63 }
64 
65 static int esdhc_of_enable_dma(struct sdhci_host *host)
66 {
67 	setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
68 	return 0;
69 }
70 
71 static unsigned int esdhc_of_get_max_clock(struct sdhci_host *host)
72 {
73 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
74 
75 	return pltfm_host->clock;
76 }
77 
78 static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
79 {
80 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
81 
82 	return pltfm_host->clock / 256 / 16;
83 }
84 
85 static struct sdhci_ops sdhci_esdhc_ops = {
86 	.read_l = sdhci_be32bs_readl,
87 	.read_w = esdhc_readw,
88 	.read_b = esdhc_readb,
89 	.write_l = sdhci_be32bs_writel,
90 	.write_w = esdhc_writew,
91 	.write_b = esdhc_writeb,
92 	.set_clock = esdhc_set_clock,
93 	.enable_dma = esdhc_of_enable_dma,
94 	.get_max_clock = esdhc_of_get_max_clock,
95 	.get_min_clock = esdhc_of_get_min_clock,
96 };
97 
98 static struct sdhci_pltfm_data sdhci_esdhc_pdata = {
99 	/* card detection could be handled via GPIO */
100 	.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_CARD_DETECTION
101 		| SDHCI_QUIRK_NO_CARD_NO_RESET,
102 	.ops = &sdhci_esdhc_ops,
103 };
104 
105 static int __devinit sdhci_esdhc_probe(struct platform_device *pdev)
106 {
107 	return sdhci_pltfm_register(pdev, &sdhci_esdhc_pdata);
108 }
109 
110 static int __devexit sdhci_esdhc_remove(struct platform_device *pdev)
111 {
112 	return sdhci_pltfm_unregister(pdev);
113 }
114 
115 static const struct of_device_id sdhci_esdhc_of_match[] = {
116 	{ .compatible = "fsl,mpc8379-esdhc" },
117 	{ .compatible = "fsl,mpc8536-esdhc" },
118 	{ .compatible = "fsl,esdhc" },
119 	{ }
120 };
121 MODULE_DEVICE_TABLE(of, sdhci_esdhc_of_match);
122 
123 static struct platform_driver sdhci_esdhc_driver = {
124 	.driver = {
125 		.name = "sdhci-esdhc",
126 		.owner = THIS_MODULE,
127 		.of_match_table = sdhci_esdhc_of_match,
128 	},
129 	.probe = sdhci_esdhc_probe,
130 	.remove = __devexit_p(sdhci_esdhc_remove),
131 #ifdef CONFIG_PM
132 	.suspend = sdhci_pltfm_suspend,
133 	.resume = sdhci_pltfm_resume,
134 #endif
135 };
136 
137 static int __init sdhci_esdhc_init(void)
138 {
139 	return platform_driver_register(&sdhci_esdhc_driver);
140 }
141 module_init(sdhci_esdhc_init);
142 
143 static void __exit sdhci_esdhc_exit(void)
144 {
145 	platform_driver_unregister(&sdhci_esdhc_driver);
146 }
147 module_exit(sdhci_esdhc_exit);
148 
149 MODULE_DESCRIPTION("SDHCI OF driver for Freescale MPC eSDHC");
150 MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
151 	      "Anton Vorontsov <avorontsov@ru.mvista.com>");
152 MODULE_LICENSE("GPL v2");
153