arch/arm/mach-mx3/mx31pdk.c

   1 /*
   2  *  Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include <linux/types.h>
  20 #include <linux/init.h>
  21 #include <linux/clk.h>
  22 #include <linux/irq.h>
  23 #include <linux/gpio.h>
  24 #include <linux/smsc911x.h>
  25 #include <linux/platform_device.h>
  26
  27 #include <mach/hardware.h>
  28 #include <asm/mach-types.h>
  29 #include <asm/mach/arch.h>
  30 #include <asm/mach/time.h>
  31 #include <asm/memory.h>
  32 #include <asm/mach/map.h>
  33 #include <mach/common.h>
  34 #include <mach/board-mx31pdk.h>
  35 #include <mach/imx-uart.h>
  36 #include <mach/iomux-mx3.h>
  37 #include "devices.h"
  38
  39 /*!
  40  * @file mx31pdk.c
  41  *
  42  * @brief This file contains the board-specific initialization routines.
  43  *
  44  * @ingroup System
  45  */
  46
  47 static int mx31pdk_pins[] = {
  48         /* UART1 */
  49         MX31_PIN_CTS1__CTS1,
  50         MX31_PIN_RTS1__RTS1,
  51         MX31_PIN_TXD1__TXD1,
  52         MX31_PIN_RXD1__RXD1,
  53         IOMUX_MODE(MX31_PIN_GPIO1_1, IOMUX_CONFIG_GPIO),
  54 };
  55
  56 static struct imxuart_platform_data uart_pdata = {
  57         .flags = IMXUART_HAVE_RTSCTS,
  58 };
  59
  60 /*
  61  * Support for the SMSC9217 on the Debug board.
  62  */
  63
  64 static struct smsc911x_platform_config smsc911x_config = {
  65         .irq_polarity   = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
  66         .irq_type       = SMSC911X_IRQ_TYPE_PUSH_PULL,
  67         .flags          = SMSC911X_USE_16BIT | SMSC911X_FORCE_INTERNAL_PHY,
  68         .phy_interface  = PHY_INTERFACE_MODE_MII,
  69 };
  70
  71 static struct resource smsc911x_resources[] = {
  72         {
  73                 .start          = LAN9217_BASE_ADDR,
  74                 .end            = LAN9217_BASE_ADDR + 0xff,
  75                 .flags          = IORESOURCE_MEM,
  76         }, {
  77                 .start          = EXPIO_INT_ENET,
  78                 .end            = EXPIO_INT_ENET,
  79                 .flags          = IORESOURCE_IRQ,
  80         },
  81 };
  82
  83 static struct platform_device smsc911x_device = {
  84         .name           = "smsc911x",
  85         .id             = -1,
  86         .num_resources  = ARRAY_SIZE(smsc911x_resources),
  87         .resource       = smsc911x_resources,
  88         .dev            = {
  89                 .platform_data = &smsc911x_config,
  90         },
  91 };
  92
  93 /*
  94  * Routines for the CPLD on the debug board. It contains a CPLD handling
  95  * LEDs, switches, interrupts for Ethernet.
  96  */
  97
  98 static void mx31pdk_expio_irq_handler(uint32_t irq, struct irq_desc *desc)
  99 {
 100         uint32_t imr_val;
 101         uint32_t int_valid;
 102         uint32_t expio_irq;
 103
 104         imr_val = __raw_readw(CPLD_INT_MASK_REG);
 105         int_valid = __raw_readw(CPLD_INT_STATUS_REG) & ~imr_val;
 106
 107         expio_irq = MXC_EXP_IO_BASE;
 108         for (; int_valid != 0; int_valid >>= 1, expio_irq++) {
 109                 if ((int_valid & 1) == 0)
 110                         continue;
 111                 generic_handle_irq(expio_irq);
 112         }
 113 }
 114
 115 /*
 116  * Disable an expio pin's interrupt by setting the bit in the imr.
 117  * @param irq           an expio virtual irq number
 118  */
 119 static void expio_mask_irq(uint32_t irq)
 120 {
 121         uint16_t reg;
 122         uint32_t expio = MXC_IRQ_TO_EXPIO(irq);
 123
 124         /* mask the interrupt */
 125         reg = __raw_readw(CPLD_INT_MASK_REG);
 126         reg |= 1 << expio;
 127         __raw_writew(reg, CPLD_INT_MASK_REG);
 128 }
 129
 130 /*
 131  * Acknowledge an expanded io pin's interrupt by clearing the bit in the isr.
 132  * @param irq           an expanded io virtual irq number
 133  */
 134 static void expio_ack_irq(uint32_t irq)
 135 {
 136         uint32_t expio = MXC_IRQ_TO_EXPIO(irq);
 137
 138         /* clear the interrupt status */
 139         __raw_writew(1 << expio, CPLD_INT_RESET_REG);
 140         __raw_writew(0, CPLD_INT_RESET_REG);
 141         /* mask the interrupt */
 142         expio_mask_irq(irq);
 143 }
 144
 145 /*
 146  * Enable a expio pin's interrupt by clearing the bit in the imr.
 147  * @param irq           a expio virtual irq number
 148  */
 149 static void expio_unmask_irq(uint32_t irq)
 150 {
 151         uint16_t reg;
 152         uint32_t expio = MXC_IRQ_TO_EXPIO(irq);
 153
 154         /* unmask the interrupt */
 155         reg = __raw_readw(CPLD_INT_MASK_REG);
 156         reg &= ~(1 << expio);
 157         __raw_writew(reg, CPLD_INT_MASK_REG);
 158 }
 159
 160 static struct irq_chip expio_irq_chip = {
 161         .ack = expio_ack_irq,
 162         .mask = expio_mask_irq,
 163         .unmask = expio_unmask_irq,
 164 };
 165
 166 static int __init mx31pdk_init_expio(void)
 167 {
 168         int i;
 169         int ret;
 170
 171         /* Check if there's a debug board connected */
 172         if ((__raw_readw(CPLD_MAGIC_NUMBER1_REG) != 0xAAAA) ||
 173             (__raw_readw(CPLD_MAGIC_NUMBER2_REG) != 0x5555) ||
 174             (__raw_readw(CPLD_MAGIC_NUMBER3_REG) != 0xCAFE)) {
 175                 /* No Debug board found */
 176                 return -ENODEV;
 177         }
 178
 179         pr_info("i.MX31PDK Debug board detected, rev = 0x%04X\n",
 180                 __raw_readw(CPLD_CODE_VER_REG));
 181
 182         /*
 183          * Configure INT line as GPIO input
 184          */
 185         ret = gpio_request(IOMUX_TO_GPIO(MX31_PIN_GPIO1_1), "sms9217-irq");
 186         if (ret)
 187                 pr_warning("could not get LAN irq gpio\n");
 188         else
 189                 gpio_direction_input(IOMUX_TO_GPIO(MX31_PIN_GPIO1_1));
 190
 191         /* Disable the interrupts and clear the status */
 192         __raw_writew(0, CPLD_INT_MASK_REG);
 193         __raw_writew(0xFFFF, CPLD_INT_RESET_REG);
 194         __raw_writew(0, CPLD_INT_RESET_REG);
 195         __raw_writew(0x1F, CPLD_INT_MASK_REG);
 196         for (i = MXC_EXP_IO_BASE;
 197              i < (MXC_EXP_IO_BASE + MXC_MAX_EXP_IO_LINES);
 198              i++) {
 199                 set_irq_chip(i, &expio_irq_chip);
 200                 set_irq_handler(i, handle_level_irq);
 201                 set_irq_flags(i, IRQF_VALID);
 202         }
 203         set_irq_type(EXPIO_PARENT_INT, IRQ_TYPE_LEVEL_LOW);
 204         set_irq_chained_handler(EXPIO_PARENT_INT, mx31pdk_expio_irq_handler);
 205
 206         return 0;
 207 }
 208
 209 /*
 210  * This structure defines the MX31 memory map.
 211  */
 212 static struct map_desc mx31pdk_io_desc[] __initdata = {
 213         {
 214                 .virtual = SPBA0_BASE_ADDR_VIRT,
 215                 .pfn = __phys_to_pfn(SPBA0_BASE_ADDR),
 216                 .length = SPBA0_SIZE,
 217                 .type = MT_DEVICE_NONSHARED,
 218         }, {
 219                 .virtual = CS5_BASE_ADDR_VIRT,
 220                 .pfn = __phys_to_pfn(CS5_BASE_ADDR),
 221                 .length = CS5_SIZE,
 222                 .type = MT_DEVICE,
 223         },
 224 };
 225
 226 /*
 227  * Set up static virtual mappings.
 228  */
 229 static void __init mx31pdk_map_io(void)
 230 {
 231         mx31_map_io();
 232         iotable_init(mx31pdk_io_desc, ARRAY_SIZE(mx31pdk_io_desc));
 233 }
 234
 235 /*!
 236  * Board specific initialization.
 237  */
 238 static void __init mxc_board_init(void)
 239 {
 240         mxc_iomux_setup_multiple_pins(mx31pdk_pins, ARRAY_SIZE(mx31pdk_pins),
 241                                       "mx31pdk");
 242
 243         mxc_register_device(&mxc_uart_device0, &uart_pdata);
 244
 245         if (!mx31pdk_init_expio())
 246                 platform_device_register(&smsc911x_device);
 247 }
 248
 249 static void __init mx31pdk_timer_init(void)
 250 {
 251         mx31_clocks_init(26000000);
 252 }
 253
 254 static struct sys_timer mx31pdk_timer = {
 255         .init   = mx31pdk_timer_init,
 256 };
 257
 258 /*
 259  * The following uses standard kernel macros defined in arch.h in order to
 260  * initialize __mach_desc_MX31PDK data structure.
 261  */
 262 MACHINE_START(MX31_3DS, "Freescale MX31PDK (3DS)")
 263         /* Maintainer: Freescale Semiconductor, Inc. */
 264         .phys_io        = AIPS1_BASE_ADDR,
 265         .io_pg_offst    = ((AIPS1_BASE_ADDR_VIRT) >> 18) & 0xfffc,
 266         .boot_params    = PHYS_OFFSET + 0x100,
 267         .map_io         = mx31pdk_map_io,
 268         .init_irq       = mxc_init_irq,
 269         .init_machine   = mxc_board_init,
 270         .timer          = &mx31pdk_timer,
 271 MACHINE_END