arch/m68knommu/platform/532x/spi-mcf532x.c

   1 /***************************************************************************/
   2 /*
   3  *      linux/arch/m68knommu/platform/532x/spi-mcf532x.c
   4  *
   5  *      Sub-architcture dependant initialization code for the Freescale
   6  *      532x SPI module
   7  *
   8  *      Yaroslav Vinogradov yaroslav.vinogradov@freescale.com
   9  *      Copyright Freescale Semiconductor, Inc 2006
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  */
  16 /***************************************************************************/
  17
  18
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/param.h>
  22 #include <linux/init.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/device.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/spi/spi.h>
  27 #include <linux/spi/mcfqspi.h>
  28 #include <linux/spi/ads7843.h>
  29
  30 #include <asm/dma.h>
  31 #include <asm/traps.h>
  32 #include <asm/machdep.h>
  33 #include <asm/coldfire.h>
  34 #include <asm/mcfsim.h>
  35 #include <asm/mcfdma.h>
  36
  37 #define SPI_NUM_CHIPSELECTS     0x04
  38 #define SPI_PAR_VAL             0xFFF0  /* Enable DIN, DOUT, CLK */
  39
  40 #define MCF532x_QSPI_IRQ_SOURCE (31)
  41 #define MCF532x_QSPI_IRQ_VECTOR (64 + MCF532x_QSPI_IRQ_SOURCE)
  42
  43 #define MCF532x_QSPI_PAR        (0xFC0A405A)
  44 #define MCF532x_QSPI_QMR        (0xFC05C000)
  45 #define MCF532x_INTC0_ICR       (0xFC048040)
  46 #define MCF532x_INTC0_IMRL      (0xFC04800C)
  47
  48 /* on 5329 EVB ADS7843 is connected to IRQ4 */
  49 #define ADS784x_IRQ_SOURCE      4
  50 #define ADS784x_IRQ_VECTOR      (64+ADS784x_IRQ_SOURCE)
  51 #define ADS7843_IRQ_LEVEL       2
  52
  53
  54 void coldfire_qspi_cs_control(u8 cs, u8 command)
  55 {
  56 }
  57
  58 #if defined(CONFIG_TOUCHSCREEN_ADS7843)
  59 static struct coldfire_spi_chip ads784x_chip_info = {
  60         .mode = SPI_MODE_0,
  61         .bits_per_word = 8,
  62         .del_cs_to_clk = 17,
  63         .del_after_trans = 1,
  64         .void_write_data = 0
  65 };
  66
  67 static struct ads7843_platform_data ads784x_platform_data = {
  68         .model = 7843,
  69         .vref_delay_usecs = 0,
  70         .x_plate_ohms = 580,
  71         .y_plate_ohms = 410
  72 };
  73 #endif
  74
  75
  76 static struct spi_board_info spi_board_info[] = {
  77 #if defined(CONFIG_TOUCHSCREEN_ADS7843)
  78         {
  79                 .modalias = "ads7843",
  80                 .max_speed_hz = 125000 * 16,
  81                 .bus_num = 1,
  82                 .chip_select = 1,
  83                 .irq = ADS784x_IRQ_VECTOR,
  84                 .platform_data = &ads784x_platform_data,
  85                 .controller_data = &ads784x_chip_info
  86         }
  87 #endif
  88 };
  89
  90 static struct coldfire_spi_master coldfire_master_info = {
  91         .bus_num = 1,
  92         .num_chipselect = SPI_NUM_CHIPSELECTS,
  93         .irq_source = MCF532x_QSPI_IRQ_SOURCE,
  94         .irq_vector = MCF532x_QSPI_IRQ_VECTOR,
  95         .irq_mask = (0x01 << MCF532x_QSPI_IRQ_SOURCE),
  96         .irq_lp = 0x5,  /* Level */
  97         .par_val = 0,   /* not used on 532x */
  98         .par_val16 = SPI_PAR_VAL,
  99         .cs_control = coldfire_qspi_cs_control,
 100 };
 101
 102 static struct resource coldfire_spi_resources[] = {
 103         [0] = {
 104                 .name = "qspi-par",
 105                 .start = MCF532x_QSPI_PAR,
 106                 .end = MCF532x_QSPI_PAR,
 107                 .flags = IORESOURCE_MEM
 108         },
 109
 110         [1] = {
 111                 .name = "qspi-module",
 112                 .start = MCF532x_QSPI_QMR,
 113                 .end = MCF532x_QSPI_QMR + 0x18,
 114                 .flags = IORESOURCE_MEM
 115         },
 116
 117         [2] = {
 118                 .name = "qspi-int-level",
 119                 .start = MCF532x_INTC0_ICR + MCF532x_QSPI_IRQ_SOURCE,
 120                 .end = MCF532x_INTC0_ICR + MCF532x_QSPI_IRQ_SOURCE,
 121                 .flags = IORESOURCE_MEM
 122         },
 123
 124         [3] = {
 125                 .name = "qspi-int-mask",
 126                 .start = MCF532x_INTC0_IMRL,
 127                 .end = MCF532x_INTC0_IMRL,
 128                 .flags = IORESOURCE_MEM
 129         }
 130 };
 131
 132 static struct platform_device coldfire_spi = {
 133         .name = "coldfire-qspi",
 134         .id = -1,
 135         .resource = coldfire_spi_resources,
 136         .num_resources = ARRAY_SIZE(coldfire_spi_resources),
 137         .dev = {
 138                 .platform_data = &coldfire_master_info,
 139         }
 140 };
 141
 142 #if defined(CONFIG_TOUCHSCREEN_ADS7843)
 143 static int __init init_ads7843(void)
 144 {
 145         /* GPIO initiaalization */
 146         MCF_GPIO_PAR_IRQ = MCF_GPIO_PAR_IRQ_PAR_IRQ4(0);
 147         /* EPORT initialization */
 148         MCF_EPORT_EPPAR = MCF_EPORT_EPPAR_EPPA4(MCF_EPORT_EPPAR_FALLING);
 149         MCF_EPORT_EPDDR = 0;
 150         MCF_EPORT_EPIER = MCF_EPORT_EPIER_EPIE4;
 151         /* enable interrupt source */
 152         MCF_INTC0_ICR4 = ADS7843_IRQ_LEVEL;
 153         MCF_INTC0_CIMR = ADS784x_IRQ_SOURCE;
 154 }
 155 #endif
 156
 157 static int __init spi_dev_init(void)
 158 {
 159         int retval = 0;
 160 #if defined(CONFIG_TOUCHSCREEN_ADS7843)
 161         init_ads7843();
 162 #endif
 163
 164         retval = platform_device_register(&coldfire_spi);
 165         if (retval < 0)
 166                 goto out;
 167
 168         if (ARRAY_SIZE(spi_board_info))
 169                 retval = spi_register_board_info(spi_board_info, ARRAY_SIZE(spi_board_info));
 170
 171
 172 out:
 173         return retval;
 174 }
 175
 176 arch_initcall(spi_dev_init);