xref: /openbmc/linux/drivers/mmc/host/sdhci-of-hlwd.c (revision 899171dc)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * drivers/mmc/host/sdhci-of-hlwd.c
4  *
5  * Nintendo Wii Secure Digital Host Controller Interface.
6  * Copyright (C) 2009 The GameCube Linux Team
7  * Copyright (C) 2009 Albert Herranz
8  *
9  * Based on sdhci-of-esdhc.c
10  *
11  * Copyright (c) 2007 Freescale Semiconductor, Inc.
12  * Copyright (c) 2009 MontaVista Software, Inc.
13  *
14  * Authors: Xiaobo Xie <X.Xie@freescale.com>
15  *	    Anton Vorontsov <avorontsov@ru.mvista.com>
16  */
17 
18 #include <linux/delay.h>
19 #include <linux/module.h>
20 #include <linux/mmc/host.h>
21 #include "sdhci-pltfm.h"
22 
23 /*
24  * Ops and quirks for the Nintendo Wii SDHCI controllers.
25  */
26 
27 /*
28  * We need a small delay after each write, or things go horribly wrong.
29  */
30 #define SDHCI_HLWD_WRITE_DELAY	5 /* usecs */
31 
sdhci_hlwd_writel(struct sdhci_host * host,u32 val,int reg)32 static void sdhci_hlwd_writel(struct sdhci_host *host, u32 val, int reg)
33 {
34 	sdhci_be32bs_writel(host, val, reg);
35 	udelay(SDHCI_HLWD_WRITE_DELAY);
36 }
37 
sdhci_hlwd_writew(struct sdhci_host * host,u16 val,int reg)38 static void sdhci_hlwd_writew(struct sdhci_host *host, u16 val, int reg)
39 {
40 	sdhci_be32bs_writew(host, val, reg);
41 	udelay(SDHCI_HLWD_WRITE_DELAY);
42 }
43 
sdhci_hlwd_writeb(struct sdhci_host * host,u8 val,int reg)44 static void sdhci_hlwd_writeb(struct sdhci_host *host, u8 val, int reg)
45 {
46 	sdhci_be32bs_writeb(host, val, reg);
47 	udelay(SDHCI_HLWD_WRITE_DELAY);
48 }
49 
50 static const struct sdhci_ops sdhci_hlwd_ops = {
51 	.read_l = sdhci_be32bs_readl,
52 	.read_w = sdhci_be32bs_readw,
53 	.read_b = sdhci_be32bs_readb,
54 	.write_l = sdhci_hlwd_writel,
55 	.write_w = sdhci_hlwd_writew,
56 	.write_b = sdhci_hlwd_writeb,
57 	.set_clock = sdhci_set_clock,
58 	.set_bus_width = sdhci_set_bus_width,
59 	.reset = sdhci_reset,
60 	.set_uhs_signaling = sdhci_set_uhs_signaling,
61 };
62 
63 static const struct sdhci_pltfm_data sdhci_hlwd_pdata = {
64 	.quirks = SDHCI_QUIRK_32BIT_DMA_ADDR |
65 		  SDHCI_QUIRK_32BIT_DMA_SIZE,
66 	.ops = &sdhci_hlwd_ops,
67 };
68 
sdhci_hlwd_probe(struct platform_device * pdev)69 static int sdhci_hlwd_probe(struct platform_device *pdev)
70 {
71 	return sdhci_pltfm_init_and_add_host(pdev, &sdhci_hlwd_pdata, 0);
72 }
73 
74 static const struct of_device_id sdhci_hlwd_of_match[] = {
75 	{ .compatible = "nintendo,hollywood-sdhci" },
76 	{ }
77 };
78 MODULE_DEVICE_TABLE(of, sdhci_hlwd_of_match);
79 
80 static struct platform_driver sdhci_hlwd_driver = {
81 	.driver = {
82 		.name = "sdhci-hlwd",
83 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
84 		.of_match_table = sdhci_hlwd_of_match,
85 		.pm = &sdhci_pltfm_pmops,
86 	},
87 	.probe = sdhci_hlwd_probe,
88 	.remove_new = sdhci_pltfm_remove,
89 };
90 
91 module_platform_driver(sdhci_hlwd_driver);
92 
93 MODULE_DESCRIPTION("Nintendo Wii SDHCI OF driver");
94 MODULE_AUTHOR("The GameCube Linux Team, Albert Herranz");
95 MODULE_LICENSE("GPL v2");
96