Paul Mundt | bf3a00f | 2006-01-16 22:14:14 -0800 | [diff] [blame] | 1 | /* |
| 2 | * arch/sh/kernel/cpu/irq/imask.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 1999, 2000 Niibe Yutaka |
| 5 | * |
| 6 | * Simple interrupt handling using IMASK of SR register. |
| 7 | * |
| 8 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | /* NOTE: Will not work on level 15 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/ptrace.h> |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/kernel_stat.h> |
| 13 | #include <linux/signal.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/bitops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/spinlock.h> |
| 19 | #include <linux/cache.h> |
| 20 | #include <linux/irq.h> |
Paul Mundt | 55620c8 | 2009-05-22 01:16:17 +0900 | [diff] [blame] | 21 | #include <linux/bitmap.h> |
Paul Mundt | bf3a00f | 2006-01-16 22:14:14 -0800 | [diff] [blame] | 22 | #include <asm/irq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | /* Bitmap of IRQ masked */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #define IMASK_PRIORITY 15 |
| 26 | |
Paul Mundt | 55620c8 | 2009-05-22 01:16:17 +0900 | [diff] [blame] | 27 | static DECLARE_BITMAP(imask_mask, IMASK_PRIORITY); |
| 28 | static int interrupt_priority; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Paul Mundt | 55620c8 | 2009-05-22 01:16:17 +0900 | [diff] [blame] | 30 | static inline void set_interrupt_registers(int ip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | { |
| 32 | unsigned long __dummy; |
| 33 | |
Yoshinori Sato | 9d4436a | 2006-11-05 15:40:13 +0900 | [diff] [blame] | 34 | asm volatile( |
| 35 | #ifdef CONFIG_CPU_HAS_SR_RB |
| 36 | "ldc %2, r6_bank\n\t" |
| 37 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | "stc sr, %0\n\t" |
| 39 | "and #0xf0, %0\n\t" |
| 40 | "shlr2 %0\n\t" |
| 41 | "cmp/eq #0x3c, %0\n\t" |
| 42 | "bt/s 1f ! CLI-ed\n\t" |
| 43 | " stc sr, %0\n\t" |
| 44 | "and %1, %0\n\t" |
| 45 | "or %2, %0\n\t" |
| 46 | "ldc %0, sr\n" |
| 47 | "1:" |
| 48 | : "=&z" (__dummy) |
| 49 | : "r" (~0xf0), "r" (ip << 4) |
| 50 | : "t"); |
| 51 | } |
| 52 | |
Paul Mundt | 949bf16 | 2010-10-27 14:54:50 +0900 | [diff] [blame] | 53 | static void mask_imask_irq(struct irq_data *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | { |
Paul Mundt | 949bf16 | 2010-10-27 14:54:50 +0900 | [diff] [blame] | 55 | unsigned int irq = data->irq; |
| 56 | |
Paul Mundt | 3709ab8 | 2009-05-26 13:52:28 +0900 | [diff] [blame] | 57 | clear_bit(irq, imask_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | if (interrupt_priority < IMASK_PRIORITY - irq) |
| 59 | interrupt_priority = IMASK_PRIORITY - irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | set_interrupt_registers(interrupt_priority); |
| 61 | } |
| 62 | |
Paul Mundt | 949bf16 | 2010-10-27 14:54:50 +0900 | [diff] [blame] | 63 | static void unmask_imask_irq(struct irq_data *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | { |
Paul Mundt | 949bf16 | 2010-10-27 14:54:50 +0900 | [diff] [blame] | 65 | unsigned int irq = data->irq; |
| 66 | |
Paul Mundt | 3709ab8 | 2009-05-26 13:52:28 +0900 | [diff] [blame] | 67 | set_bit(irq, imask_mask); |
Paul Mundt | 55620c8 | 2009-05-22 01:16:17 +0900 | [diff] [blame] | 68 | interrupt_priority = IMASK_PRIORITY - |
| 69 | find_first_zero_bit(imask_mask, IMASK_PRIORITY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | set_interrupt_registers(interrupt_priority); |
| 71 | } |
| 72 | |
Paul Mundt | 55620c8 | 2009-05-22 01:16:17 +0900 | [diff] [blame] | 73 | static struct irq_chip imask_irq_chip = { |
Thomas Gleixner | 648f153 | 2009-11-17 22:50:45 +0000 | [diff] [blame] | 74 | .name = "SR.IMASK", |
Paul Mundt | 949bf16 | 2010-10-27 14:54:50 +0900 | [diff] [blame] | 75 | .irq_mask = mask_imask_irq, |
| 76 | .irq_unmask = unmask_imask_irq, |
| 77 | .irq_mask_ack = mask_imask_irq, |
Paul Mundt | 55620c8 | 2009-05-22 01:16:17 +0900 | [diff] [blame] | 78 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | void make_imask_irq(unsigned int irq) |
| 81 | { |
Thomas Gleixner | fcb8918 | 2011-03-24 16:31:17 +0100 | [diff] [blame] | 82 | irq_set_chip_and_handler_name(irq, &imask_irq_chip, handle_level_irq, |
| 83 | "level"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | } |