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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Altera SPI driver
*
* based on bfin_spi.c
* Copyright (c) 2005-2008 Analog Devices Inc.
* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <log.h>
#include <malloc.h>
#include <fdtdec.h>
#include <spi.h>
#include <asm/io.h>
#include <linux/bitops.h>
#define ALTERA_SPI_STATUS_RRDY_MSK BIT(7)
#define ALTERA_SPI_CONTROL_SSO_MSK BIT(10)
#ifndef CONFIG_ALTERA_SPI_IDLE_VAL
#define CONFIG_ALTERA_SPI_IDLE_VAL 0xff
#endif
struct altera_spi_regs {
u32 rxdata;
u32 txdata;
u32 status;
u32 control;
u32 _reserved;
u32 slave_sel;
};
struct altera_spi_platdata {
struct altera_spi_regs *regs;
};
struct altera_spi_priv {
struct altera_spi_regs *regs;
};
static void spi_cs_activate(struct udevice *dev, uint cs)
{
struct udevice *bus = dev->parent;
struct altera_spi_priv *priv = dev_get_priv(bus);
struct altera_spi_regs *const regs = priv->regs;
writel(1 << cs, ®s->slave_sel);
writel(ALTERA_SPI_CONTROL_SSO_MSK, ®s->control);
}
static void spi_cs_deactivate(struct udevice *dev)
{
struct udevice *bus = dev->parent;
struct altera_spi_priv *priv = dev_get_priv(bus);
struct altera_spi_regs *const regs = priv->regs;
writel(0, ®s->control);
writel(0, ®s->slave_sel);
}
static int altera_spi_claim_bus(struct udevice *dev)
{
struct udevice *bus = dev->parent;
struct altera_spi_priv *priv = dev_get_priv(bus);
struct altera_spi_regs *const regs = priv->regs;
writel(0, ®s->control);
writel(0, ®s->slave_sel);
return 0;
}
static int altera_spi_release_bus(struct udevice *dev)
{
struct udevice *bus = dev->parent;
struct altera_spi_priv *priv = dev_get_priv(bus);
struct altera_spi_regs *const regs = priv->regs;
writel(0, ®s->slave_sel);
return 0;
}
static int altera_spi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
struct udevice *bus = dev->parent;
struct altera_spi_priv *priv = dev_get_priv(bus);
struct altera_spi_regs *const regs = priv->regs;
struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
/* assume spi core configured to do 8 bit transfers */
unsigned int bytes = bitlen / 8;
const unsigned char *txp = dout;
unsigned char *rxp = din;
uint32_t reg, data, start;
debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", __func__,
bus->seq, slave_plat->cs, bitlen, bytes, flags);
if (bitlen == 0)
goto done;
if (bitlen % 8) {
flags |= SPI_XFER_END;
goto done;
}
/* empty read buffer */
if (readl(®s->status) & ALTERA_SPI_STATUS_RRDY_MSK)
readl(®s->rxdata);
if (flags & SPI_XFER_BEGIN)
spi_cs_activate(dev, slave_plat->cs);
while (bytes--) {
if (txp)
data = *txp++;
else
data = CONFIG_ALTERA_SPI_IDLE_VAL;
debug("%s: tx:%x ", __func__, data);
writel(data, ®s->txdata);
start = get_timer(0);
while (1) {
reg = readl(®s->status);
if (reg & ALTERA_SPI_STATUS_RRDY_MSK)
break;
if (get_timer(start) > (CONFIG_SYS_HZ / 1000)) {
debug("%s: Transmission timed out!\n", __func__);
return -1;
}
}
data = readl(®s->rxdata);
if (rxp)
*rxp++ = data & 0xff;
debug("rx:%x\n", data);
}
done:
if (flags & SPI_XFER_END)
spi_cs_deactivate(dev);
return 0;
}
static int altera_spi_set_speed(struct udevice *bus, uint speed)
{
return 0;
}
static int altera_spi_set_mode(struct udevice *bus, uint mode)
{
return 0;
}
static int altera_spi_probe(struct udevice *bus)
{
struct altera_spi_platdata *plat = dev_get_platdata(bus);
struct altera_spi_priv *priv = dev_get_priv(bus);
priv->regs = plat->regs;
return 0;
}
static int altera_spi_ofdata_to_platdata(struct udevice *bus)
{
struct altera_spi_platdata *plat = dev_get_platdata(bus);
plat->regs = map_physmem(devfdt_get_addr(bus),
sizeof(struct altera_spi_regs),
MAP_NOCACHE);
return 0;
}
static const struct dm_spi_ops altera_spi_ops = {
.claim_bus = altera_spi_claim_bus,
.release_bus = altera_spi_release_bus,
.xfer = altera_spi_xfer,
.set_speed = altera_spi_set_speed,
.set_mode = altera_spi_set_mode,
/*
* cs_info is not needed, since we require all chip selects to be
* in the device tree explicitly
*/
};
static const struct udevice_id altera_spi_ids[] = {
{ .compatible = "altr,spi-1.0" },
{}
};
U_BOOT_DRIVER(altera_spi) = {
.name = "altera_spi",
.id = UCLASS_SPI,
.of_match = altera_spi_ids,
.ops = &altera_spi_ops,
.ofdata_to_platdata = altera_spi_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct altera_spi_platdata),
.priv_auto_alloc_size = sizeof(struct altera_spi_priv),
.probe = altera_spi_probe,
};
|
