Eric Lee / smarc-fsl-linux-kernel

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arch/h8300/platform/h8s/irq.c 3.11 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  /*
   * linux/arch/h8300/platform/h8s/ints_h8s.c
   * Interrupt handling CPU variants
   *
   * Yoshinori Sato <ysato@users.sourceforge.jp>
   *
   */
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  #include <linux/init.h>
  #include <linux/errno.h>
  #include <linux/kernel.h>
  
  #include <asm/ptrace.h>
  #include <asm/traps.h>
  #include <asm/irq.h>
  #include <asm/io.h>
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  #include <asm/gpio-internal.h>
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  #include <asm/regs267x.h>
  
  /* saved vector list */
  const int __initdata h8300_saved_vectors[]={
  #if defined(CONFIG_GDB_DEBUG)
  	TRACE_VEC,
  	TRAP3_VEC,
  #endif
  	-1
  };
  
  /* trap entry table */
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  const H8300_VECTOR __initdata h8300_trap_table[] = {
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  	0,0,0,0,0,
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  	trace_break,  /* TRACE */
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  	0,0,
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  	system_call,  /* TRAPA #0 */
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  	0,0,0,0,0,0,0
  };
  
  /* IRQ pin assignment */
  struct irq_pins {
  	unsigned char port_no;
  	unsigned char bit_no;
  } __attribute__((aligned(1),packed));
  /* ISTR = 0 */
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  static const struct irq_pins irq_assign_table0[16]={
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          {H8300_GPIO_P5,H8300_GPIO_B0},{H8300_GPIO_P5,H8300_GPIO_B1},
  	{H8300_GPIO_P5,H8300_GPIO_B2},{H8300_GPIO_P5,H8300_GPIO_B3},
  	{H8300_GPIO_P5,H8300_GPIO_B4},{H8300_GPIO_P5,H8300_GPIO_B5},
  	{H8300_GPIO_P5,H8300_GPIO_B6},{H8300_GPIO_P5,H8300_GPIO_B7},
  	{H8300_GPIO_P6,H8300_GPIO_B0},{H8300_GPIO_P6,H8300_GPIO_B1},
  	{H8300_GPIO_P6,H8300_GPIO_B2},{H8300_GPIO_P6,H8300_GPIO_B3},
  	{H8300_GPIO_P6,H8300_GPIO_B4},{H8300_GPIO_P6,H8300_GPIO_B5},
  	{H8300_GPIO_PF,H8300_GPIO_B1},{H8300_GPIO_PF,H8300_GPIO_B2},
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  };
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  /* ISTR = 1 */
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  static const struct irq_pins irq_assign_table1[16]={
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  	{H8300_GPIO_P8,H8300_GPIO_B0},{H8300_GPIO_P8,H8300_GPIO_B1},
  	{H8300_GPIO_P8,H8300_GPIO_B2},{H8300_GPIO_P8,H8300_GPIO_B3},
  	{H8300_GPIO_P8,H8300_GPIO_B4},{H8300_GPIO_P8,H8300_GPIO_B5},
  	{H8300_GPIO_PH,H8300_GPIO_B2},{H8300_GPIO_PH,H8300_GPIO_B3},
  	{H8300_GPIO_P2,H8300_GPIO_B0},{H8300_GPIO_P2,H8300_GPIO_B1},
  	{H8300_GPIO_P2,H8300_GPIO_B2},{H8300_GPIO_P2,H8300_GPIO_B3},
  	{H8300_GPIO_P2,H8300_GPIO_B4},{H8300_GPIO_P2,H8300_GPIO_B5},
  	{H8300_GPIO_P2,H8300_GPIO_B6},{H8300_GPIO_P2,H8300_GPIO_B7},
  };
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  /* IRQ to GPIO pin translation */
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  #define IRQ_GPIO_MAP(irqbit,irq,port,bit)			  \
  do {								  \
  	if (*(volatile unsigned short *)ITSR & irqbit) {	  \
  		port = irq_assign_table1[irq - EXT_IRQ0].port_no; \
  		bit  = irq_assign_table1[irq - EXT_IRQ0].bit_no;  \
  	} else {						  \
  		port = irq_assign_table0[irq - EXT_IRQ0].port_no; \
  		bit  = irq_assign_table0[irq - EXT_IRQ0].bit_no;  \
  	}							  \
  } while(0)
  
  int h8300_enable_irq_pin(unsigned int irq)
  {
  	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
  		unsigned short ptn = 1 << (irq - EXT_IRQ0);
  		unsigned int port_no,bit_no;
  		IRQ_GPIO_MAP(ptn, irq, port_no, bit_no);
  		if (H8300_GPIO_RESERVE(port_no, bit_no) == 0)
  			return -EBUSY;                   /* pin already use */
  		H8300_GPIO_DDR(port_no, bit_no, H8300_GPIO_INPUT);
  		*(volatile unsigned short *)ISR &= ~ptn; /* ISR clear */
  	}
  
  	return 0;
  }
  
  void h8300_disable_irq_pin(unsigned int irq)
  {
  	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
  		/* disable interrupt & release IRQ pin */
  		unsigned short ptn = 1 << (irq - EXT_IRQ0);
  		unsigned short port_no,bit_no;
  		*(volatile unsigned short *)ISR &= ~ptn;
  		*(volatile unsigned short *)IER &= ~ptn;
  		IRQ_GPIO_MAP(ptn, irq, port_no, bit_no);
  		H8300_GPIO_FREE(port_no, bit_no);
  	}
  }