summaryrefslogtreecommitdiffstats
path: root/qemu/roms/u-boot/drivers/spi/fdt_spi.c
blob: 58f139a54ea960f1a9b590164949c2a5f7fca9ac (plain)
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
/*
 * Common fdt based SPI driver front end
 *
 * Copyright (c) 2013 NVIDIA Corporation
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/arch/clock.h>
#include <asm/arch-tegra/clk_rst.h>
#include <asm/arch-tegra20/tegra20_sflash.h>
#include <asm/arch-tegra20/tegra20_slink.h>
#include <asm/arch-tegra114/tegra114_spi.h>
#include <spi.h>
#include <fdtdec.h>

DECLARE_GLOBAL_DATA_PTR;

struct fdt_spi_driver {
	int compat;
	int max_ctrls;
	int (*init)(int *node_list, int count);
	int (*claim_bus)(struct spi_slave *slave);
	int (*release_bus)(struct spi_slave *slave);
	int (*cs_is_valid)(unsigned int bus, unsigned int cs);
	struct spi_slave *(*setup_slave)(unsigned int bus, unsigned int cs,
					unsigned int max_hz, unsigned int mode);
	void (*free_slave)(struct spi_slave *slave);
	void (*cs_activate)(struct spi_slave *slave);
	void (*cs_deactivate)(struct spi_slave *slave);
	int (*xfer)(struct spi_slave *slave, unsigned int bitlen,
		    const void *data_out, void *data_in, unsigned long flags);
};

static struct fdt_spi_driver fdt_spi_drivers[] = {
#ifdef CONFIG_TEGRA20_SFLASH
	{
		.compat		= COMPAT_NVIDIA_TEGRA20_SFLASH,
		.max_ctrls	= 1,
		.init		= tegra20_spi_init,
		.claim_bus	= tegra20_spi_claim_bus,
		.cs_is_valid	= tegra20_spi_cs_is_valid,
		.setup_slave	= tegra20_spi_setup_slave,
		.free_slave	= tegra20_spi_free_slave,
		.cs_activate	= tegra20_spi_cs_activate,
		.cs_deactivate	= tegra20_spi_cs_deactivate,
		.xfer		= tegra20_spi_xfer,
	},
#endif
#ifdef CONFIG_TEGRA20_SLINK
	{
		.compat		= COMPAT_NVIDIA_TEGRA20_SLINK,
		.max_ctrls	= CONFIG_TEGRA_SLINK_CTRLS,
		.init		= tegra30_spi_init,
		.claim_bus	= tegra30_spi_claim_bus,
		.cs_is_valid	= tegra30_spi_cs_is_valid,
		.setup_slave	= tegra30_spi_setup_slave,
		.free_slave	= tegra30_spi_free_slave,
		.cs_activate	= tegra30_spi_cs_activate,
		.cs_deactivate	= tegra30_spi_cs_deactivate,
		.xfer		= tegra30_spi_xfer,
	},
#endif
#ifdef CONFIG_TEGRA114_SPI
	{
		.compat		= COMPAT_NVIDIA_TEGRA114_SPI,
		.max_ctrls	= CONFIG_TEGRA114_SPI_CTRLS,
		.init		= tegra114_spi_init,
		.claim_bus	= tegra114_spi_claim_bus,
		.cs_is_valid	= tegra114_spi_cs_is_valid,
		.setup_slave	= tegra114_spi_setup_slave,
		.free_slave	= tegra114_spi_free_slave,
		.cs_activate	= tegra114_spi_cs_activate,
		.cs_deactivate	= tegra114_spi_cs_deactivate,
		.xfer		= tegra114_spi_xfer,
	},
#endif
};

static struct fdt_spi_driver *driver;

int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
	if (!driver)
		return 0;
	else if (!driver->cs_is_valid)
		return 1;
	else
		return driver->cs_is_valid(bus, cs);
}

struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
		unsigned int max_hz, unsigned int mode)
{
	if (!driver || !driver->setup_slave)
		return NULL;

	return driver->setup_slave(bus, cs, max_hz, mode);
}

void spi_free_slave(struct spi_slave *slave)
{
	if (driver && driver->free_slave)
		return driver->free_slave(slave);
}

static int spi_init_driver(struct fdt_spi_driver *driver)
{
	int count;
	int node_list[driver->max_ctrls];

	count = fdtdec_find_aliases_for_id(gd->fdt_blob, "spi",
					   driver->compat,
					   node_list,
					   driver->max_ctrls);
	return driver->init(node_list, count);
}

void spi_init(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(fdt_spi_drivers); i++) {
		driver = &fdt_spi_drivers[i];
		if (!spi_init_driver(driver))
			break;
	}
	if (i == ARRAY_SIZE(fdt_spi_drivers))
		driver = NULL;
}

int spi_claim_bus(struct spi_slave *slave)
{
	if (!driver)
		return 1;
	if (!driver->claim_bus)
		return 0;

	return driver->claim_bus(slave);
}

void spi_release_bus(struct spi_slave *slave)
{
	if (driver && driver->release_bus)
		driver->release_bus(slave);
}

void spi_cs_activate(struct spi_slave *slave)
{
	if (driver && driver->cs_activate)
		driver->cs_activate(slave);
}

void spi_cs_deactivate(struct spi_slave *slave)
{
	if (driver && driver->cs_deactivate)
		driver->cs_deactivate(slave);
}

int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
	     const void *data_out, void *data_in, unsigned long flags)
{
	if (!driver || !driver->xfer)
		return -1;

	return driver->xfer(slave, bitlen, data_out, data_in, flags);
}