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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/*
* Qualcomm SDHCI driver - SD/eMMC controller
*
* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
*
* Based on Linux driver
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <sdhci.h>
#include <wait_bit.h>
#include <asm/io.h>
#include <linux/bitops.h>
/* Non-standard registers needed for SDHCI startup */
#define SDCC_MCI_POWER 0x0
#define SDCC_MCI_POWER_SW_RST BIT(7)
/* This is undocumented register */
#define SDCC_MCI_VERSION 0x50
#define SDCC_MCI_VERSION_MAJOR_SHIFT 28
#define SDCC_MCI_VERSION_MAJOR_MASK (0xf << SDCC_MCI_VERSION_MAJOR_SHIFT)
#define SDCC_MCI_VERSION_MINOR_MASK 0xff
#define SDCC_MCI_STATUS2 0x6C
#define SDCC_MCI_STATUS2_MCI_ACT 0x1
#define SDCC_MCI_HC_MODE 0x78
/* Offset to SDHCI registers */
#define SDCC_SDHCI_OFFSET 0x900
/* Non standard (?) SDHCI register */
#define SDHCI_VENDOR_SPEC_CAPABILITIES0 0x11c
struct msm_sdhc_plat {
struct mmc_config cfg;
struct mmc mmc;
};
struct msm_sdhc {
struct sdhci_host host;
void *base;
};
DECLARE_GLOBAL_DATA_PTR;
static int msm_sdc_clk_init(struct udevice *dev)
{
uint clk_rate = fdtdec_get_uint(gd->fdt_blob, dev->of_offset,
"clock-frequency", 400000);
uint clkd[2]; /* clk_id and clk_no */
int clk_offset;
struct udevice *clk_dev;
struct clk clk;
int ret;
ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "clock", clkd,
2);
if (ret)
return ret;
clk_offset = fdt_node_offset_by_phandle(gd->fdt_blob, clkd[0]);
if (clk_offset < 0)
return clk_offset;
ret = uclass_get_device_by_of_offset(UCLASS_CLK, clk_offset, &clk_dev);
if (ret)
return ret;
clk.id = clkd[1];
ret = clk_request(clk_dev, &clk);
if (ret < 0)
return ret;
ret = clk_set_rate(&clk, clk_rate);
clk_free(&clk);
if (ret < 0)
return ret;
return 0;
}
static int msm_sdc_probe(struct udevice *dev)
{
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct msm_sdhc_plat *plat = dev_get_platdata(dev);
struct msm_sdhc *prv = dev_get_priv(dev);
struct sdhci_host *host = &prv->host;
u32 core_version, core_minor, core_major;
u32 caps;
int ret;
host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_BROKEN_R1B;
/* Init clocks */
ret = msm_sdc_clk_init(dev);
if (ret)
return ret;
/* Reset the core and Enable SDHC mode */
writel(readl(prv->base + SDCC_MCI_POWER) | SDCC_MCI_POWER_SW_RST,
prv->base + SDCC_MCI_POWER);
/* Wait for reset to be written to register */
if (wait_for_bit(__func__, prv->base + SDCC_MCI_STATUS2,
SDCC_MCI_STATUS2_MCI_ACT, false, 10, false)) {
printf("msm_sdhci: reset request failed\n");
return -EIO;
}
/* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */
if (wait_for_bit(__func__, prv->base + SDCC_MCI_POWER,
SDCC_MCI_POWER_SW_RST, false, 2, false)) {
printf("msm_sdhci: stuck in reset\n");
return -ETIMEDOUT;
}
/* Enable host-controller mode */
writel(1, prv->base + SDCC_MCI_HC_MODE);
core_version = readl(prv->base + SDCC_MCI_VERSION);
core_major = (core_version & SDCC_MCI_VERSION_MAJOR_MASK);
core_major >>= SDCC_MCI_VERSION_MAJOR_SHIFT;
core_minor = core_version & SDCC_MCI_VERSION_MINOR_MASK;
/*
* Support for some capabilities is not advertised by newer
* controller versions and must be explicitly enabled.
*/
if (core_major >= 1 && core_minor != 0x11 && core_minor != 0x12) {
caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
caps |= SDHCI_CAN_VDD_300 | SDHCI_CAN_DO_8BIT;
writel(caps, host->ioaddr + SDHCI_VENDOR_SPEC_CAPABILITIES0);
}
/* Set host controller version */
host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
host->mmc = &plat->mmc;
if (ret)
return ret;
host->mmc->priv = &prv->host;
host->mmc->dev = dev;
upriv->mmc = host->mmc;
return sdhci_probe(dev);
}
static int msm_sdc_remove(struct udevice *dev)
{
struct msm_sdhc *priv = dev_get_priv(dev);
/* Disable host-controller mode */
writel(0, priv->base + SDCC_MCI_HC_MODE);
return 0;
}
static int msm_ofdata_to_platdata(struct udevice *dev)
{
struct udevice *parent = dev->parent;
struct msm_sdhc *priv = dev_get_priv(dev);
struct sdhci_host *host = &priv->host;
host->name = strdup(dev->name);
host->ioaddr = (void *)dev_get_addr(dev);
host->bus_width = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
"bus-width", 4);
host->index = fdtdec_get_uint(gd->fdt_blob, dev->of_offset, "index", 0);
priv->base = (void *)fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
parent->of_offset,
dev->of_offset,
"reg", 1, NULL,
false);
if (priv->base == (void *)FDT_ADDR_T_NONE ||
host->ioaddr == (void *)FDT_ADDR_T_NONE)
return -EINVAL;
return 0;
}
static int msm_sdc_bind(struct udevice *dev)
{
struct msm_sdhc_plat *plat = dev_get_platdata(dev);
int ret;
ret = sdhci_bind(dev, &plat->mmc, &plat->cfg);
if (ret)
return ret;
return 0;
}
static const struct udevice_id msm_mmc_ids[] = {
{ .compatible = "qcom,sdhci-msm-v4" },
{ }
};
U_BOOT_DRIVER(msm_sdc_drv) = {
.name = "msm_sdc",
.id = UCLASS_MMC,
.of_match = msm_mmc_ids,
.ofdata_to_platdata = msm_ofdata_to_platdata,
.ops = &sdhci_ops,
.bind = msm_sdc_bind,
.probe = msm_sdc_probe,
.remove = msm_sdc_remove,
.priv_auto_alloc_size = sizeof(struct msm_sdhc),
.platdata_auto_alloc_size = sizeof(struct msm_sdhc_plat),
};
|
