arch/mips/bcm63xx/dev-spi.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2009-2011 Florian Fainelli <florian@openwrt.org>
   7  * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/export.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/err.h>
  15 #include <linux/clk.h>
  16
  17 #include <bcm63xx_cpu.h>
  18 #include <bcm63xx_dev_spi.h>
  19 #include <bcm63xx_regs.h>
  20
  21 #ifdef BCMCPU_RUNTIME_DETECT
  22 /*
  23  * register offsets
  24  */
  25 static const unsigned long bcm6338_regs_spi[] = {
  26         __GEN_SPI_REGS_TABLE(6338)
  27 };
  28
  29 static const unsigned long bcm6348_regs_spi[] = {
  30         __GEN_SPI_REGS_TABLE(6348)
  31 };
  32
  33 static const unsigned long bcm6358_regs_spi[] = {
  34         __GEN_SPI_REGS_TABLE(6358)
  35 };
  36
  37 static const unsigned long bcm6368_regs_spi[] = {
  38         __GEN_SPI_REGS_TABLE(6368)
  39 };
  40
  41 const unsigned long *bcm63xx_regs_spi;
  42 EXPORT_SYMBOL(bcm63xx_regs_spi);
  43
  44 static __init void bcm63xx_spi_regs_init(void)
  45 {
  46         if (BCMCPU_IS_6338())
  47                 bcm63xx_regs_spi = bcm6338_regs_spi;
  48         if (BCMCPU_IS_6348())
  49                 bcm63xx_regs_spi = bcm6348_regs_spi;
  50         if (BCMCPU_IS_6358())
  51                 bcm63xx_regs_spi = bcm6358_regs_spi;
  52         if (BCMCPU_IS_6368())
  53                 bcm63xx_regs_spi = bcm6368_regs_spi;
  54 }
  55 #else
  56 static __init void bcm63xx_spi_regs_init(void) { }
  57 #endif
  58
  59 static struct resource spi_resources[] = {
  60         {
  61                 .start          = -1, /* filled at runtime */
  62                 .end            = -1, /* filled at runtime */
  63                 .flags          = IORESOURCE_MEM,
  64         },
  65         {
  66                 .start          = -1, /* filled at runtime */
  67                 .flags          = IORESOURCE_IRQ,
  68         },
  69 };
  70
  71 static struct bcm63xx_spi_pdata spi_pdata = {
  72         .bus_num                = 0,
  73         .num_chipselect         = 8,
  74 };
  75
  76 static struct platform_device bcm63xx_spi_device = {
  77         .name           = "bcm63xx-spi",
  78         .id             = -1,
  79         .num_resources  = ARRAY_SIZE(spi_resources),
  80         .resource       = spi_resources,
  81         .dev            = {
  82                 .platform_data = &spi_pdata,
  83         },
  84 };
  85
  86 int __init bcm63xx_spi_register(void)
  87 {
  88         struct clk *periph_clk;
  89
  90         if (BCMCPU_IS_6328() || BCMCPU_IS_6345())
  91                 return -ENODEV;
  92
  93         periph_clk = clk_get(NULL, "periph");
  94         if (IS_ERR(periph_clk)) {
  95                 pr_err("unable to get periph clock\n");
  96                 return -ENODEV;
  97         }
  98
  99         /* Set bus frequency */
 100         spi_pdata.speed_hz = clk_get_rate(periph_clk);
 101
 102         spi_resources[0].start = bcm63xx_regset_address(RSET_SPI);
 103         spi_resources[0].end = spi_resources[0].start;
 104         spi_resources[1].start = bcm63xx_get_irq_number(IRQ_SPI);
 105
 106         if (BCMCPU_IS_6338() || BCMCPU_IS_6348()) {
 107                 spi_resources[0].end += BCM_6338_RSET_SPI_SIZE - 1;
 108                 spi_pdata.fifo_size = SPI_6338_MSG_DATA_SIZE;
 109                 spi_pdata.msg_type_shift = SPI_6338_MSG_TYPE_SHIFT;
 110                 spi_pdata.msg_ctl_width = SPI_6338_MSG_CTL_WIDTH;
 111         }
 112
 113         if (BCMCPU_IS_6358() || BCMCPU_IS_6368()) {
 114                 spi_resources[0].end += BCM_6358_RSET_SPI_SIZE - 1;
 115                 spi_pdata.fifo_size = SPI_6358_MSG_DATA_SIZE;
 116                 spi_pdata.msg_type_shift = SPI_6358_MSG_TYPE_SHIFT;
 117                 spi_pdata.msg_ctl_width = SPI_6358_MSG_CTL_WIDTH;
 118         }
 119
 120         bcm63xx_spi_regs_init();
 121
 122         return platform_device_register(&bcm63xx_spi_device);
 123 }