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
|
/*-
* Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <sys/time.h>
#include <sys/timetc.h>
#include <sys/watchdog.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/resource.h>
#include <machine/frame.h>
#include <machine/intr.h>
#include <dev/spibus/spi.h>
#include <dev/spibus/spibusvar.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/lpc/lpcreg.h>
#include <arm/lpc/lpcvar.h>
#include "spibus_if.h"
struct lpc_spi_softc
{
device_t ls_dev;
struct resource * ls_mem_res;
struct resource * ls_irq_res;
bus_space_tag_t ls_bst;
bus_space_handle_t ls_bsh;
};
static int lpc_spi_probe(device_t);
static int lpc_spi_attach(device_t);
static int lpc_spi_detach(device_t);
static int lpc_spi_transfer(device_t, device_t, struct spi_command *);
#define lpc_spi_read_4(_sc, _reg) \
bus_space_read_4(_sc->ls_bst, _sc->ls_bsh, _reg)
#define lpc_spi_write_4(_sc, _reg, _val) \
bus_space_write_4(_sc->ls_bst, _sc->ls_bsh, _reg, _val)
static int
lpc_spi_probe(device_t dev)
{
if (!ofw_bus_is_compatible(dev, "lpc,spi"))
return (ENXIO);
device_set_desc(dev, "LPC32x0 PL022 SPI/SSP controller");
return (BUS_PROBE_DEFAULT);
}
static int
lpc_spi_attach(device_t dev)
{
struct lpc_spi_softc *sc = device_get_softc(dev);
int rid;
sc->ls_dev = dev;
rid = 0;
sc->ls_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (!sc->ls_mem_res) {
device_printf(dev, "cannot allocate memory window\n");
return (ENXIO);
}
sc->ls_bst = rman_get_bustag(sc->ls_mem_res);
sc->ls_bsh = rman_get_bushandle(sc->ls_mem_res);
rid = 0;
sc->ls_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE);
if (!sc->ls_irq_res) {
device_printf(dev, "cannot allocate interrupt\n");
return (ENXIO);
}
bus_space_write_4(sc->ls_bst, 0xd0028100, 0, (1<<12)|(1<<10)|(1<<9)|(1<<8)|(1<<6)|(1<<5));
lpc_pwr_write(dev, LPC_CLKPWR_SSP_CTRL, LPC_CLKPWR_SSP_CTRL_SSP0EN);
lpc_spi_write_4(sc, LPC_SSP_CR0, LPC_SSP_CR0_DSS(8));
lpc_spi_write_4(sc, LPC_SSP_CR1, LPC_SSP_CR1_SSE);
lpc_spi_write_4(sc, LPC_SSP_CPSR, 128);
device_add_child(dev, "spibus", 0);
return (bus_generic_attach(dev));
}
static int
lpc_spi_detach(device_t dev)
{
return (EBUSY);
}
static int
lpc_spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
{
struct lpc_spi_softc *sc = device_get_softc(dev);
struct spibus_ivar *devi = SPIBUS_IVAR(child);
uint8_t *in_buf, *out_buf;
int i;
/* Set CS active */
lpc_gpio_set_state(child, devi->cs, 0);
/* Wait for FIFO to be ready */
while ((lpc_spi_read_4(sc, LPC_SSP_SR) & LPC_SSP_SR_TNF) == 0);
/* Command */
in_buf = cmd->rx_cmd;
out_buf = cmd->tx_cmd;
for (i = 0; i < cmd->tx_cmd_sz; i++) {
lpc_spi_write_4(sc, LPC_SSP_DR, out_buf[i]);
in_buf[i] = lpc_spi_read_4(sc, LPC_SSP_DR);
}
/* Data */
in_buf = cmd->rx_data;
out_buf = cmd->tx_data;
for (i = 0; i < cmd->tx_data_sz; i++) {
lpc_spi_write_4(sc, LPC_SSP_DR, out_buf[i]);
in_buf[i] = lpc_spi_read_4(sc, LPC_SSP_DR);
}
/* Set CS inactive */
lpc_gpio_set_state(child, devi->cs, 1);
return (0);
}
static device_method_t lpc_spi_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, lpc_spi_probe),
DEVMETHOD(device_attach, lpc_spi_attach),
DEVMETHOD(device_detach, lpc_spi_detach),
/* SPI interface */
DEVMETHOD(spibus_transfer, lpc_spi_transfer),
{ 0, 0 }
};
static devclass_t lpc_spi_devclass;
static driver_t lpc_spi_driver = {
"spi",
lpc_spi_methods,
sizeof(struct lpc_spi_softc),
};
DRIVER_MODULE(lpcspi, simplebus, lpc_spi_driver, lpc_spi_devclass, 0, 0);
|
