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Diffstat (limited to 'arch/sh/boards/ec3104/irq.c')
| -rw-r--r-- | arch/sh/boards/ec3104/irq.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/arch/sh/boards/ec3104/irq.c b/arch/sh/boards/ec3104/irq.c new file mode 100644 index 000000000000..ffa4ff1f090f --- /dev/null +++ b/arch/sh/boards/ec3104/irq.c @@ -0,0 +1,196 @@ +/* + * linux/arch/sh/boards/ec3104/irq.c + * EC3104 companion chip support + * + * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> + * + */ + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/ec3104/ec3104.h> + +/* This is for debugging mostly; here's the table that I intend to keep + * in here: + * + * index function base addr power interrupt bit + * 0 power b0ec0000 --- 00000001 (unused) + * 1 irqs b0ec1000 --- 00000002 (unused) + * 2 ?? b0ec2000 b0ec0008 00000004 + * 3 PS2 (1) b0ec3000 b0ec000c 00000008 + * 4 PS2 (2) b0ec4000 b0ec0010 00000010 + * 5 ?? b0ec5000 b0ec0014 00000020 + * 6 I2C b0ec6000 b0ec0018 00000040 + * 7 serial (1) b0ec7000 b0ec001c 00000080 + * 8 serial (2) b0ec8000 b0ec0020 00000100 + * 9 serial (3) b0ec9000 b0ec0024 00000200 + * 10 serial (4) b0eca000 b0ec0028 00000400 + * 12 GPIO (1) b0ecc000 b0ec0030 + * 13 GPIO (2) b0ecc000 b0ec0030 + * 16 pcmcia (1) b0ed0000 b0ec0040 00010000 + * 17 pcmcia (2) b0ed1000 b0ec0044 00020000 + */ + +/* I used the register names from another interrupt controller I worked with, + * since it seems to be identical to the ec3104 except that all bits are + * inverted: + * + * IRR: Interrupt Request Register (pending and enabled interrupts) + * IMR: Interrupt Mask Register (which interrupts are enabled) + * IPR: Interrupt Pending Register (pending interrupts, even disabled ones) + * + * 0 bits mean pending or enabled, 1 bits mean not pending or disabled. all + * IRQs seem to be level-triggered. + */ + +#define EC3104_IRR (EC3104_BASE + 0x1000) +#define EC3104_IMR (EC3104_BASE + 0x1004) +#define EC3104_IPR (EC3104_BASE + 0x1008) + +#define ctrl_readl(addr) (*(volatile u32 *)(addr)) +#define ctrl_writel(data,addr) (*(volatile u32 *)(addr) = (data)) +#define ctrl_readb(addr) (*(volatile u8 *)(addr)) + +static char *ec3104_name(unsigned index) +{ + switch(index) { + case 0: + return "power management"; + case 1: + return "interrupts"; + case 3: + return "PS2 (1)"; + case 4: + return "PS2 (2)"; + case 5: + return "I2C (1)"; + case 6: + return "I2C (2)"; + case 7: + return "serial (1)"; + case 8: + return "serial (2)"; + case 9: + return "serial (3)"; + case 10: + return "serial (4)"; + case 16: + return "pcmcia (1)"; + case 17: + return "pcmcia (2)"; + default: { + static char buf[32]; + + sprintf(buf, "unknown (%d)", index); + + return buf; + } + } +} + +int get_pending_interrupts(char *buf) +{ + u32 ipr; + u32 bit; + char *p = buf; + + p += sprintf(p, "pending: ("); + + ipr = ctrl_inl(EC3104_IPR); + + for (bit = 1; bit < 32; bit++) + if (!(ipr & (1<<bit))) + p += sprintf(p, "%s ", ec3104_name(bit)); + + p += sprintf(p, ")\n"); + + return p - buf; +} + +static inline u32 ec3104_irq2mask(unsigned int irq) +{ + return (1 << (irq - EC3104_IRQBASE)); +} + +static inline void mask_ec3104_irq(unsigned int irq) +{ + u32 mask; + + mask = ctrl_readl(EC3104_IMR); + + mask |= ec3104_irq2mask(irq); + + ctrl_writel(mask, EC3104_IMR); +} + +static inline void unmask_ec3104_irq(unsigned int irq) +{ + u32 mask; + + mask = ctrl_readl(EC3104_IMR); + + mask &= ~ec3104_irq2mask(irq); + + ctrl_writel(mask, EC3104_IMR); +} + +static void disable_ec3104_irq(unsigned int irq) +{ + mask_ec3104_irq(irq); +} + +static void enable_ec3104_irq(unsigned int irq) +{ + unmask_ec3104_irq(irq); +} + +static void mask_and_ack_ec3104_irq(unsigned int irq) +{ + mask_ec3104_irq(irq); +} + +static void end_ec3104_irq(unsigned int irq) +{ + if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) + unmask_ec3104_irq(irq); +} + +static unsigned int startup_ec3104_irq(unsigned int irq) +{ + unmask_ec3104_irq(irq); + + return 0; +} + +static void shutdown_ec3104_irq(unsigned int irq) +{ + mask_ec3104_irq(irq); + +} + +static struct hw_interrupt_type ec3104_int = { + .typename = "EC3104", + .enable = enable_ec3104_irq, + .disable = disable_ec3104_irq, + .ack = mask_and_ack_ec3104_irq, + .end = end_ec3104_irq, + .startup = startup_ec3104_irq, + .shutdown = shutdown_ec3104_irq, +}; + +/* Yuck. the _demux API is ugly */ +int ec3104_irq_demux(int irq) +{ + if (irq == EC3104_IRQ) { + unsigned int mask; + + mask = ctrl_readl(EC3104_IRR); + + if (mask == 0xffffffff) + return EC3104_IRQ; + else + return EC3104_IRQBASE + ffz(mask); + } + + return irq; +} |