release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sh/boards/mach-sdk7786/irq.c

   1 /*
   2  * SDK7786 FPGA IRQ Controller Support.
   3  *
   4  * Copyright (C) 2010  Matt Fleming
   5  * Copyright (C) 2010  Paul Mundt
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  */
  11 #include <linux/irq.h>
  12 #include <mach/fpga.h>
  13 #include <mach/irq.h>
  14
  15 enum {
  16         ATA_IRQ_BIT             = 1,
  17         SPI_BUSY_BIT            = 2,
  18         LIRQ5_BIT               = 3,
  19         LIRQ6_BIT               = 4,
  20         LIRQ7_BIT               = 5,
  21         LIRQ8_BIT               = 6,
  22         KEY_IRQ_BIT             = 7,
  23         PEN_IRQ_BIT             = 8,
  24         ETH_IRQ_BIT             = 9,
  25         RTC_ALARM_BIT           = 10,
  26         CRYSTAL_FAIL_BIT        = 12,
  27         ETH_PME_BIT             = 14,
  28 };
  29
  30 void __init sdk7786_init_irq(void)
  31 {
  32         unsigned int tmp;
  33
  34         /* Enable priority encoding for all IRLs */
  35         fpga_write_reg(fpga_read_reg(INTMSR) | 0x0303, INTMSR);
  36
  37         /* Clear FPGA interrupt status registers */
  38         fpga_write_reg(0x0000, INTASR);
  39         fpga_write_reg(0x0000, INTBSR);
  40
  41         /* Unmask FPGA interrupts */
  42         tmp = fpga_read_reg(INTAMR);
  43         tmp &= ~(1 << ETH_IRQ_BIT);
  44         fpga_write_reg(tmp, INTAMR);
  45
  46         plat_irq_setup_pins(IRQ_MODE_IRL7654_MASK);
  47         plat_irq_setup_pins(IRQ_MODE_IRL3210_MASK);
  48 }