tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC
3 *
4 * Author: Saeed Bishara <saeed@marvell.com>
5 * Mike Rapoport <mike@compulab.co.il>
6 * Based on sdhci-cns3xxx.c
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22#include <linux/clk.h>
23#include <linux/err.h>
24#include <linux/io.h>
25#include <linux/mmc/host.h>
26#include <linux/module.h>
27#include <linux/of.h>
28
29#include "sdhci-pltfm.h"
30
31struct sdhci_dove_priv {
32 struct clk *clk;
33};
34
35static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
36{
37 u16 ret;
38
39 switch (reg) {
40 case SDHCI_HOST_VERSION:
41 case SDHCI_SLOT_INT_STATUS:
42 /* those registers don't exist */
43 return 0;
44 default:
45 ret = readw(host->ioaddr + reg);
46 }
47 return ret;
48}
49
50static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
51{
52 u32 ret;
53
54 ret = readl(host->ioaddr + reg);
55
56 switch (reg) {
57 case SDHCI_CAPABILITIES:
58 /* Mask the support for 3.0V */
59 ret &= ~SDHCI_CAN_VDD_300;
60 break;
61 }
62 return ret;
63}
64
65static const struct sdhci_ops sdhci_dove_ops = {
66 .read_w = sdhci_dove_readw,
67 .read_l = sdhci_dove_readl,
68 .set_clock = sdhci_set_clock,
69 .set_bus_width = sdhci_set_bus_width,
70 .reset = sdhci_reset,
71 .set_uhs_signaling = sdhci_set_uhs_signaling,
72};
73
74static const struct sdhci_pltfm_data sdhci_dove_pdata = {
75 .ops = &sdhci_dove_ops,
76 .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
77 SDHCI_QUIRK_NO_BUSY_IRQ |
78 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
79 SDHCI_QUIRK_FORCE_DMA |
80 SDHCI_QUIRK_NO_HISPD_BIT,
81};
82
83static int sdhci_dove_probe(struct platform_device *pdev)
84{
85 struct sdhci_host *host;
86 struct sdhci_pltfm_host *pltfm_host;
87 struct sdhci_dove_priv *priv;
88 int ret;
89
90 priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv),
91 GFP_KERNEL);
92 if (!priv) {
93 dev_err(&pdev->dev, "unable to allocate private data");
94 return -ENOMEM;
95 }
96
97 priv->clk = devm_clk_get(&pdev->dev, NULL);
98
99 host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0);
100 if (IS_ERR(host))
101 return PTR_ERR(host);
102
103 pltfm_host = sdhci_priv(host);
104 pltfm_host->priv = priv;
105
106 if (!IS_ERR(priv->clk))
107 clk_prepare_enable(priv->clk);
108
109 ret = mmc_of_parse(host->mmc);
110 if (ret)
111 goto err_sdhci_add;
112
113 ret = sdhci_add_host(host);
114 if (ret)
115 goto err_sdhci_add;
116
117 return 0;
118
119err_sdhci_add:
120 if (!IS_ERR(priv->clk))
121 clk_disable_unprepare(priv->clk);
122 sdhci_pltfm_free(pdev);
123 return ret;
124}
125
126static int sdhci_dove_remove(struct platform_device *pdev)
127{
128 struct sdhci_host *host = platform_get_drvdata(pdev);
129 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
130 struct sdhci_dove_priv *priv = pltfm_host->priv;
131
132 sdhci_pltfm_unregister(pdev);
133
134 if (!IS_ERR(priv->clk))
135 clk_disable_unprepare(priv->clk);
136
137 return 0;
138}
139
140static const struct of_device_id sdhci_dove_of_match_table[] = {
141 { .compatible = "marvell,dove-sdhci", },
142 {}
143};
144MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
145
146static struct platform_driver sdhci_dove_driver = {
147 .driver = {
148 .name = "sdhci-dove",
149 .owner = THIS_MODULE,
150 .pm = SDHCI_PLTFM_PMOPS,
151 .of_match_table = sdhci_dove_of_match_table,
152 },
153 .probe = sdhci_dove_probe,
154 .remove = sdhci_dove_remove,
155};
156
157module_platform_driver(sdhci_dove_driver);
158
159MODULE_DESCRIPTION("SDHCI driver for Dove");
160MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
161 "Mike Rapoport <mike@compulab.co.il>");
162MODULE_LICENSE("GPL v2");