src/include/pc80/i8259.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef PC80_I8259_H
   4 #define PC80_I8259_H
   5
   6 #include <stdint.h>
   7
   8 /*
   9  * IRQ numbers and common usage
  10  * If an IRQ does not say it is 'Reserved'
  11  * then it can be used by a device, though
  12  * some systems may not adhere to this map.
  13  */
  14 /* PIC IRQs */
  15 #define IRQ_DIS         0x1F    /* IRQ is disabled */
  16 #define IRQ_0           0x00    /* Reserved - Timer IRQ */
  17 #define IRQ_1           0x01    /* Keyboard controller */
  18 #define IRQ_2           0x02    /* Reserved - Cascade to Slave PIC */
  19 #define IRQ_3           0x03    /* Serial Port 2 & 4 */
  20 #define IRQ_4           0x04    /* Serial Port 1 & 3 */
  21 #define IRQ_5           0x05    /* Parallel Port 2 & 3 or Sound Card */
  22 #define IRQ_6           0x06    /* Floppy Disk Controller */
  23 #define IRQ_7           0x07    /* Parallel Port 1 */
  24 #define IRQ_8           0x08    /* Reserved - RTC */
  25 #define IRQ_9           0x09    /* Reserved - ACPI System Control Interrupt */
  26 #define IRQ_10          0x0A    /* Free or SCSI or NIC */
  27 #define IRQ_11          0x0B    /* Free or SCSI or NIC */
  28 #define IRQ_12          0x0C    /* PS/2 Mouse */
  29 #define IRQ_13          0x0D    /* Reserved - CPU Floating Point Unit */
  30 #define IRQ_14          0x0E    /* Primary ATA */
  31 #define IRQ_15          0x0F    /* Secondary ATA */
  32
  33 #define MASTER_PIC_ICW1         0x20
  34 #define SLAVE_PIC_ICW1          0xa0
  35 #define   ICW_SELECT            (1 << 4)
  36 #define   OCW_SELECT            (0 << 4)
  37 #define   ADI                   (1 << 2)
  38 #define   SNGL                  (1 << 1)
  39 #define   IC4                   (1 << 0)
  40
  41 #define MASTER_PIC_ICW2         0x21
  42 #define SLAVE_PIC_ICW2          0xa1
  43 #define   INT_VECTOR_MASTER     0x20
  44 #define   IRQ0                  0x00
  45 #define   IRQ1                  0x01
  46 #define   INT_VECTOR_SLAVE      0x28
  47 #define   IRQ8                  0x00
  48 #define   IRQ9                  0x01
  49
  50 #define MASTER_PIC_ICW3         0x21
  51 #define   CASCADED_PIC          (1 << 2)
  52
  53 #define MASTER_PIC_ICW4         0x21
  54 #define SLAVE_PIC_ICW4          0xa1
  55 #define   MICROPROCESSOR_MODE   (1 << 0)
  56
  57 #define SLAVE_PIC_ICW3          0xa1
  58 #define    SLAVE_ID             0x02
  59
  60 #define MASTER_PIC_OCW1         0x21
  61 #define SLAVE_PIC_OCW1          0xa1
  62 #define    IRQ2                 (1 << 2)
  63 #define    ALL_IRQS             0xff
  64
  65 #define ELCR1                   0x4d0
  66 #define ELCR2                   0x4d1
  67
  68 #define IRQ_LEVEL_TRIGGERED     1
  69 #define IRQ_EDGE_TRIGGERED      0
  70
  71 u16 pic_read_irq_mask(void);
  72 void pic_write_irq_mask(u16 mask);
  73 void pic_irq_enable(u8 int_num, u8 mask);
  74 void setup_i8259(void);
  75 void i8259_configure_irq_trigger(int int_num, int is_level_triggered);
  76
  77 #endif /* PC80_I8259_H */