1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/*
* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/mmc/host.h>
#include <linux/mmc/dw_mmc.h>
#include <linux/of_address.h>
#include "dw_mmc.h"
#include "dw_mmc-pltfm.h"
#define RK3288_CLKGEN_DIV 2
static void dw_mci_rockchip_prepare_command(struct dw_mci *host, u32 *cmdr)
{
*cmdr |= SDMMC_CMD_USE_HOLD_REG;
}
static int dw_mci_rk3288_setup_clock(struct dw_mci *host)
{
host->bus_hz /= RK3288_CLKGEN_DIV;
return 0;
}
static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
{
int ret;
unsigned int cclkin;
u32 bus_hz;
if (ios->clock == 0)
return;
/*
* cclkin: source clock of mmc controller
* bus_hz: card interface clock generated by CLKGEN
* bus_hz = cclkin / RK3288_CLKGEN_DIV
* ios->clock = (div == 0) ? bus_hz : (bus_hz / (2 * div))
*
* Note: div can only be 0 or 1
* if DDR50 8bit mode(only emmc work in 8bit mode),
* div must be set 1
*/
if (ios->bus_width == MMC_BUS_WIDTH_8 &&
ios->timing == MMC_TIMING_MMC_DDR52)
cclkin = 2 * ios->clock * RK3288_CLKGEN_DIV;
else
cclkin = ios->clock * RK3288_CLKGEN_DIV;
ret = clk_set_rate(host->ciu_clk, cclkin);
if (ret)
dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
bus_hz = clk_get_rate(host->ciu_clk) / RK3288_CLKGEN_DIV;
if (bus_hz != host->bus_hz) {
host->bus_hz = bus_hz;
/* force dw_mci_setup_bus() */
host->current_speed = 0;
}
}
static int dw_mci_rockchip_init(struct dw_mci *host)
{
/* It is slot 8 on Rockchip SoCs */
host->sdio_id0 = 8;
return 0;
}
static const struct dw_mci_drv_data rk2928_drv_data = {
.prepare_command = dw_mci_rockchip_prepare_command,
.init = dw_mci_rockchip_init,
};
static const struct dw_mci_drv_data rk3288_drv_data = {
.prepare_command = dw_mci_rockchip_prepare_command,
.set_ios = dw_mci_rk3288_set_ios,
.setup_clock = dw_mci_rk3288_setup_clock,
.init = dw_mci_rockchip_init,
};
static const struct of_device_id dw_mci_rockchip_match[] = {
{ .compatible = "rockchip,rk2928-dw-mshc",
.data = &rk2928_drv_data },
{ .compatible = "rockchip,rk3288-dw-mshc",
.data = &rk3288_drv_data },
{},
};
MODULE_DEVICE_TABLE(of, dw_mci_rockchip_match);
static int dw_mci_rockchip_probe(struct platform_device *pdev)
{
const struct dw_mci_drv_data *drv_data;
const struct of_device_id *match;
if (!pdev->dev.of_node)
return -ENODEV;
match = of_match_node(dw_mci_rockchip_match, pdev->dev.of_node);
drv_data = match->data;
return dw_mci_pltfm_register(pdev, drv_data);
}
#ifdef CONFIG_PM_SLEEP
static int dw_mci_rockchip_suspend(struct device *dev)
{
struct dw_mci *host = dev_get_drvdata(dev);
return dw_mci_suspend(host);
}
static int dw_mci_rockchip_resume(struct device *dev)
{
struct dw_mci *host = dev_get_drvdata(dev);
return dw_mci_resume(host);
}
#endif /* CONFIG_PM_SLEEP */
static SIMPLE_DEV_PM_OPS(dw_mci_rockchip_pmops,
dw_mci_rockchip_suspend,
dw_mci_rockchip_resume);
static struct platform_driver dw_mci_rockchip_pltfm_driver = {
.probe = dw_mci_rockchip_probe,
.remove = dw_mci_pltfm_remove,
.driver = {
.name = "dwmmc_rockchip",
.of_match_table = dw_mci_rockchip_match,
.pm = &dw_mci_rockchip_pmops,
},
};
module_platform_driver(dw_mci_rockchip_pltfm_driver);
MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");
MODULE_DESCRIPTION("Rockchip Specific DW-MSHC Driver Extension");
MODULE_ALIAS("platform:dwmmc-rockchip");
MODULE_LICENSE("GPL v2");
|
