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
|
/*
* arch/arm/mach-u300/spi.c
*
* Copyright (C) 2009 ST-Ericsson AB
* License terms: GNU General Public License (GPL) version 2
*
* Author: Linus Walleij <linus.walleij@stericsson.com>
*/
#include <linux/device.h>
#include <linux/amba/bus.h>
#include <linux/spi/spi.h>
#include <linux/amba/pl022.h>
#include <linux/err.h>
#include <mach/coh901318.h>
#include <mach/dma_channels.h>
/*
* The following is for the actual devices on the SSP/SPI bus
*/
#ifdef CONFIG_MACH_U300_SPIDUMMY
static void select_dummy_chip(u32 chipselect)
{
pr_debug("CORE: %s called with CS=0x%x (%s)\n",
__func__,
chipselect,
chipselect ? "unselect chip" : "select chip");
/*
* Here you would write the chip select value to the GPIO pins if
* this was a real chip (but this is a loopback dummy).
*/
}
struct pl022_config_chip dummy_chip_info = {
/* available POLLING_TRANSFER, INTERRUPT_TRANSFER, DMA_TRANSFER */
.com_mode = DMA_TRANSFER,
.iface = SSP_INTERFACE_MOTOROLA_SPI,
/* We can only act as master but SSP_SLAVE is possible in theory */
.hierarchy = SSP_MASTER,
/* 0 = drive TX even as slave, 1 = do not drive TX as slave */
.slave_tx_disable = 0,
.rx_lev_trig = SSP_RX_4_OR_MORE_ELEM,
.tx_lev_trig = SSP_TX_4_OR_MORE_EMPTY_LOC,
.ctrl_len = SSP_BITS_12,
.wait_state = SSP_MWIRE_WAIT_ZERO,
.duplex = SSP_MICROWIRE_CHANNEL_FULL_DUPLEX,
/*
* This is where you insert a call to a function to enable CS
* (usually GPIO) for a certain chip.
*/
.cs_control = select_dummy_chip,
};
#endif
static struct spi_board_info u300_spi_devices[] = {
#ifdef CONFIG_MACH_U300_SPIDUMMY
{
/* A dummy chip used for loopback tests */
.modalias = "spi-dummy",
/* Really dummy, pass in additional chip config here */
.platform_data = NULL,
/* This defines how the controller shall handle the device */
.controller_data = &dummy_chip_info,
/* .irq - no external IRQ routed from this device */
.max_speed_hz = 1000000,
.bus_num = 0, /* Only one bus on this chip */
.chip_select = 0,
/* Means SPI_CS_HIGH, change if e.g low CS */
.mode = SPI_MODE_1 | SPI_LOOP,
},
#endif
};
static struct pl022_ssp_controller ssp_platform_data = {
/* If you have several SPI buses this varies, we have only bus 0 */
.bus_id = 0,
/*
* On the APP CPU GPIO 4, 5 and 6 are connected as generic
* chip selects for SPI. (Same on U330, U335 and U365.)
* TODO: make sure the GPIO driver can select these properly
* and do padmuxing accordingly too.
*/
.num_chipselect = 3,
#ifdef CONFIG_COH901318
.enable_dma = 1,
.dma_filter = coh901318_filter_id,
.dma_rx_param = (void *) U300_DMA_SPI_RX,
.dma_tx_param = (void *) U300_DMA_SPI_TX,
#else
.enable_dma = 0,
#endif
};
void __init u300_spi_init(struct amba_device *adev)
{
adev->dev.platform_data = &ssp_platform_data;
}
void __init u300_spi_register_board_devices(void)
{
/* Register any SPI devices */
spi_register_board_info(u300_spi_devices, ARRAY_SIZE(u300_spi_devices));
}
|
