arch/m68k/coldfire/stmark2.c

   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  */
  21 static 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
  37 static 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
  44 static 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) */
  56 static 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
  63 static 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 */
  82 static 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
  92 static 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  */
  99 static 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
 119 late_initcall(init_stmark2);