tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * stmark2.c -- Support for Sysam AMCORE open board
3 *
4 * (C) Copyright 2017, Angelo Dureghello <angelo@sysam.it>
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
8 * for more details.
9 */
10
11#include <linux/platform_device.h>
12#include <linux/mtd/partitions.h>
13#include <linux/spi/spi.h>
14#include <linux/spi/spi-fsl-dspi.h>
15#include <linux/spi/flash.h>
16#include <asm/mcfsim.h>
17
18/*
19 * Partitioning of parallel NOR flash (39VF3201B)
20 */
21static struct mtd_partition stmark2_partitions[] = {
22 {
23 .name = "U-Boot (1024K)",
24 .size = 0x100000,
25 .offset = 0x0
26 }, {
27 .name = "Kernel+initramfs (7168K)",
28 .size = 0x700000,
29 .offset = MTDPART_OFS_APPEND
30 }, {
31 .name = "Flash Free Space (8192K)",
32 .size = MTDPART_SIZ_FULL,
33 .offset = MTDPART_OFS_APPEND
34 }
35};
36
37static struct flash_platform_data stmark2_spi_flash_data = {
38 .name = "is25lp128",
39 .parts = stmark2_partitions,
40 .nr_parts = ARRAY_SIZE(stmark2_partitions),
41 .type = "is25lp128",
42};
43
44static struct spi_board_info stmark2_board_info[] __initdata = {
45 {
46 .modalias = "m25p80",
47 .max_speed_hz = 5000000,
48 .bus_num = 0,
49 .chip_select = 1,
50 .platform_data = &stmark2_spi_flash_data,
51 .mode = SPI_MODE_3,
52 }
53};
54
55/* SPI controller data, SPI (0) */
56static struct fsl_dspi_platform_data dspi_spi0_info = {
57 .cs_num = 4,
58 .bus_num = 0,
59 .sck_cs_delay = 100,
60 .cs_sck_delay = 100,
61};
62
63static struct resource dspi_spi0_resource[] = {
64 [0] = {
65 .start = MCFDSPI_BASE0,
66 .end = MCFDSPI_BASE0 + 0xFF,
67 .flags = IORESOURCE_MEM,
68 },
69 [1] = {
70 .start = 12,
71 .end = 13,
72 .flags = IORESOURCE_DMA,
73 },
74 [2] = {
75 .start = MCF_IRQ_DSPI0,
76 .end = MCF_IRQ_DSPI0,
77 .flags = IORESOURCE_IRQ,
78 },
79};
80
81/* SPI controller, id = bus number */
82static struct platform_device dspi_spi0_device = {
83 .name = "fsl-dspi",
84 .id = 0,
85 .num_resources = ARRAY_SIZE(dspi_spi0_resource),
86 .resource = dspi_spi0_resource,
87 .dev = {
88 .platform_data = &dspi_spi0_info,
89 },
90};
91
92static struct platform_device *stmark2_devices[] __initdata = {
93 &dspi_spi0_device,
94};
95
96/*
97 * Note: proper pin-mux setup is mandatory for proper SPI functionality.
98 */
99static int __init init_stmark2(void)
100{
101 /* DSPI0, all pins as DSPI, and using CS1 */
102 __raw_writeb(0x80, MCFGPIO_PAR_DSPIOWL);
103 __raw_writeb(0xfc, MCFGPIO_PAR_DSPIOWH);
104
105 /* Board gpio setup */
106 __raw_writeb(0x00, MCFGPIO_PAR_BE);
107 __raw_writeb(0x00, MCFGPIO_PAR_FBCTL);
108 __raw_writeb(0x00, MCFGPIO_PAR_CS);
109 __raw_writeb(0x00, MCFGPIO_PAR_CANI2C);
110
111 platform_add_devices(stmark2_devices, ARRAY_SIZE(stmark2_devices));
112
113 spi_register_board_info(stmark2_board_info,
114 ARRAY_SIZE(stmark2_board_info));
115
116 return 0;
117}
118
119late_initcall(init_stmark2);