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 <linux/dma-mapping.h>
  17 #include <asm/mcfsim.h>
  18
  19 /*
  20  * Partitioning of parallel NOR flash (39VF3201B)
  21  */
  22 static struct mtd_partition stmark2_partitions[] = {
  23         {
  24                 .name = "U-Boot (1024K)",
  25                 .size = 0x100000,
  26                 .offset = 0x0
  27         }, {
  28                 .name = "Kernel+initramfs (7168K)",
  29                 .size = 0x700000,
  30                 .offset = MTDPART_OFS_APPEND
  31         }, {
  32                 .name = "Flash Free Space (8192K)",
  33                 .size = MTDPART_SIZ_FULL,
  34                 .offset = MTDPART_OFS_APPEND
  35         }
  36 };
  37
  38 static struct flash_platform_data stmark2_spi_flash_data = {
  39         .name = "is25lp128",
  40         .parts = stmark2_partitions,
  41         .nr_parts = ARRAY_SIZE(stmark2_partitions),
  42         .type = "is25lp128",
  43 };
  44
  45 static struct spi_board_info stmark2_board_info[] __initdata = {
  46         {
  47                 .modalias = "m25p80",
  48                 .max_speed_hz = 5000000,
  49                 .bus_num = 0,
  50                 .chip_select = 1,
  51                 .platform_data = &stmark2_spi_flash_data,
  52                 .mode = SPI_MODE_3,
  53         }
  54 };
  55
  56 /* SPI controller data, SPI (0) */
  57 static struct fsl_dspi_platform_data dspi_spi0_info = {
  58         .cs_num = 4,
  59         .bus_num = 0,
  60         .sck_cs_delay = 100,
  61         .cs_sck_delay = 100,
  62 };
  63
  64 static struct resource dspi_spi0_resource[] = {
  65         [0] = {
  66                 .start = MCFDSPI_BASE0,
  67                 .end   = MCFDSPI_BASE0 + 0xFF,
  68                 .flags = IORESOURCE_MEM,
  69                 },
  70         [1] = {
  71                 .start = 12,
  72                 .end   = 13,
  73                 .flags = IORESOURCE_DMA,
  74         },
  75         [2] = {
  76                 .start = MCF_IRQ_DSPI0,
  77                 .end   = MCF_IRQ_DSPI0,
  78                 .flags = IORESOURCE_IRQ,
  79         },
  80 };
  81
  82 static u64 stmark2_dspi_mask = DMA_BIT_MASK(32);
  83
  84 /* SPI controller, id = bus number */
  85 static struct platform_device dspi_spi0_device = {
  86         .name = "fsl-dspi",
  87         .id = 0,
  88         .num_resources = ARRAY_SIZE(dspi_spi0_resource),
  89         .resource = dspi_spi0_resource,
  90         .dev = {
  91                 .platform_data = &dspi_spi0_info,
  92                 .dma_mask = &stmark2_dspi_mask,
  93                 .coherent_dma_mask = DMA_BIT_MASK(32),
  94         },
  95 };
  96
  97 static struct platform_device *stmark2_devices[] __initdata = {
  98         &dspi_spi0_device,
  99 };
 100
 101 /*
 102  * Note: proper pin-mux setup is mandatory for proper SPI functionality.
 103  */
 104 static int __init init_stmark2(void)
 105 {
 106         /* DSPI0, all pins as DSPI, and using CS1 */
 107         __raw_writeb(0x80, MCFGPIO_PAR_DSPIOWL);
 108         __raw_writeb(0xfc, MCFGPIO_PAR_DSPIOWH);
 109
 110         /* Board gpio setup */
 111         __raw_writeb(0x00, MCFGPIO_PAR_BE);
 112         __raw_writeb(0x00, MCFGPIO_PAR_FBCTL);
 113         __raw_writeb(0x00, MCFGPIO_PAR_CS);
 114         __raw_writeb(0x00, MCFGPIO_PAR_CANI2C);
 115
 116         platform_add_devices(stmark2_devices, ARRAY_SIZE(stmark2_devices));
 117
 118         spi_register_board_info(stmark2_board_info,
 119                                 ARRAY_SIZE(stmark2_board_info));
 120
 121         return 0;
 122 }
 123
 124 late_initcall(init_stmark2);