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
|
// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/types.h>
#include "spi-pxa2xx.h"
static bool pxa2xx_spi_idma_filter(struct dma_chan *chan, void *param)
{
return param == chan->device->dev;
}
static int
pxa2xx_spi_init_ssp(struct platform_device *pdev, struct ssp_device *ssp, enum pxa_ssp_type type)
{
struct device *dev = &pdev->dev;
struct resource *res;
int status;
u64 uid;
ssp->mmio_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(ssp->mmio_base))
return PTR_ERR(ssp->mmio_base);
ssp->phys_base = res->start;
ssp->clk = devm_clk_get(dev, NULL);
if (IS_ERR(ssp->clk))
return PTR_ERR(ssp->clk);
ssp->irq = platform_get_irq(pdev, 0);
if (ssp->irq < 0)
return ssp->irq;
ssp->type = type;
ssp->dev = dev;
status = acpi_dev_uid_to_integer(ACPI_COMPANION(dev), &uid);
if (status)
ssp->port_id = -1;
else
ssp->port_id = uid;
return 0;
}
static void pxa2xx_spi_ssp_release(void *ssp)
{
pxa_ssp_free(ssp);
}
static struct ssp_device *pxa2xx_spi_ssp_request(struct platform_device *pdev)
{
struct ssp_device *ssp;
int status;
ssp = pxa_ssp_request(pdev->id, pdev->name);
if (!ssp)
return NULL;
status = devm_add_action_or_reset(&pdev->dev, pxa2xx_spi_ssp_release, ssp);
if (status)
return ERR_PTR(status);
return ssp;
}
static struct pxa2xx_spi_controller *
pxa2xx_spi_init_pdata(struct platform_device *pdev)
{
struct pxa2xx_spi_controller *pdata;
struct device *dev = &pdev->dev;
struct device *parent = dev->parent;
const void *match = device_get_match_data(dev);
enum pxa_ssp_type type = SSP_UNDEFINED;
struct ssp_device *ssp;
bool is_lpss_priv;
u32 num_cs = 1;
int status;
ssp = pxa2xx_spi_ssp_request(pdev);
if (IS_ERR(ssp))
return ERR_CAST(ssp);
if (ssp) {
type = ssp->type;
} else if (match) {
type = (enum pxa_ssp_type)(uintptr_t)match;
} else {
u32 value;
status = device_property_read_u32(dev, "intel,spi-pxa2xx-type", &value);
if (status)
return ERR_PTR(status);
type = (enum pxa_ssp_type)value;
}
/* Validate the SSP type correctness */
if (!(type > SSP_UNDEFINED && type < SSP_MAX))
return ERR_PTR(-EINVAL);
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
/* Platforms with iDMA 64-bit */
is_lpss_priv = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpss_priv");
if (is_lpss_priv) {
pdata->tx_param = parent;
pdata->rx_param = parent;
pdata->dma_filter = pxa2xx_spi_idma_filter;
}
/* Read number of chip select pins, if provided */
device_property_read_u32(dev, "num-cs", &num_cs);
pdata->num_chipselect = num_cs;
pdata->is_target = device_property_read_bool(dev, "spi-slave");
pdata->enable_dma = true;
pdata->dma_burst_size = 1;
/* If SSP has been already enumerated, use it */
if (ssp)
return pdata;
status = pxa2xx_spi_init_ssp(pdev, &pdata->ssp, type);
if (status)
return ERR_PTR(status);
return pdata;
}
static int pxa2xx_spi_platform_probe(struct platform_device *pdev)
{
struct pxa2xx_spi_controller *platform_info;
struct device *dev = &pdev->dev;
struct ssp_device *ssp;
platform_info = dev_get_platdata(dev);
if (!platform_info) {
platform_info = pxa2xx_spi_init_pdata(pdev);
if (IS_ERR(platform_info))
return dev_err_probe(dev, PTR_ERR(platform_info), "missing platform data\n");
}
ssp = pxa2xx_spi_ssp_request(pdev);
if (IS_ERR(ssp))
return PTR_ERR(ssp);
if (!ssp)
ssp = &platform_info->ssp;
return pxa2xx_spi_probe(dev, ssp, platform_info);
}
static void pxa2xx_spi_platform_remove(struct platform_device *pdev)
{
pxa2xx_spi_remove(&pdev->dev);
}
static const struct acpi_device_id pxa2xx_spi_acpi_match[] = {
{ "80860F0E" },
{ "8086228E" },
{ "INT33C0" },
{ "INT33C1" },
{ "INT3430" },
{ "INT3431" },
{}
};
MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
static const struct of_device_id pxa2xx_spi_of_match[] = {
{ .compatible = "marvell,mmp2-ssp", .data = (void *)MMP2_SSP },
{}
};
MODULE_DEVICE_TABLE(of, pxa2xx_spi_of_match);
static struct platform_driver driver = {
.driver = {
.name = "pxa2xx-spi",
.pm = pm_ptr(&pxa2xx_spi_pm_ops),
.acpi_match_table = pxa2xx_spi_acpi_match,
.of_match_table = pxa2xx_spi_of_match,
},
.probe = pxa2xx_spi_platform_probe,
.remove_new = pxa2xx_spi_platform_remove,
};
static int __init pxa2xx_spi_init(void)
{
return platform_driver_register(&driver);
}
subsys_initcall(pxa2xx_spi_init);
static void __exit pxa2xx_spi_exit(void)
{
platform_driver_unregister(&driver);
}
module_exit(pxa2xx_spi_exit);
MODULE_AUTHOR("Stephen Street");
MODULE_DESCRIPTION("PXA2xx SSP SPI Controller platform driver");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(SPI_PXA2xx);
MODULE_ALIAS("platform:pxa2xx-spi");
MODULE_SOFTDEP("pre: dw_dmac");
|
