projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 8a764482 YS |
1 | /* |
| 2 | * H8/300H interrupt controller driver | |
| 3 | * | |
| 4 | * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp> | |
| 5 | */ | |
| 6 | ||
| 7 | #include <linux/init.h> | |
| 8 | #include <linux/irq.h> | |
| 9 | #include <linux/irqchip.h> | |
| 10 | #include <linux/of_address.h> | |
| 11 | #include <linux/of_irq.h> | |
| 12 | #include <asm/io.h> | |
| 13 | ||
| 14 | #include "irqchip.h" | |
| 15 | ||
| 16 | static const char ipr_bit[] = { | |
| 17 | 7, 6, 5, 5, | |
| 18 | 4, 4, 4, 4, 3, 3, 3, 3, | |
| 19 | 2, 2, 2, 2, 1, 1, 1, 1, | |
| 20 | 0, 0, 0, 0, 15, 15, 15, 15, | |
| 21 | 14, 14, 14, 14, 13, 13, 13, 13, | |
| 22 | -1, -1, -1, -1, 11, 11, 11, 11, | |
| 23 | 10, 10, 10, 10, 9, 9, 9, 9, | |
| 24 | }; | |
| 25 | ||
| 26 | static void *intc_baseaddr; | |
| 27 | ||
| 28 | #define IPR ((unsigned long)intc_baseaddr + 6) | |
| 29 | ||
| 30 | static void h8300h_disable_irq(struct irq_data *data) | |
| 31 | { | |
| 32 | int bit; | |
| 33 | int irq = data->irq - 12; | |
| 34 | ||
| 35 | bit = ipr_bit[irq]; | |
| 36 | if (bit >= 0) { | |
| 37 | if (bit < 8) | |
| 38 | ctrl_bclr(bit & 7, IPR); | |
| 39 | else | |
| 40 | ctrl_bclr(bit & 7, (IPR+1)); | |
| 41 | } | |
| 42 | } | |
| 43 | ||
| 44 | static void h8300h_enable_irq(struct irq_data *data) | |
| 45 | { | |
| 46 | int bit; | |
| 47 | int irq = data->irq - 12; | |
| 48 | ||
| 49 | bit = ipr_bit[irq]; | |
| 50 | if (bit >= 0) { | |
| 51 | if (bit < 8) | |
| 52 | ctrl_bset(bit & 7, IPR); | |
| 53 | else | |
| 54 | ctrl_bset(bit & 7, (IPR+1)); | |
| 55 | } | |
| 56 | } | |
| 57 | ||
| 58 | struct irq_chip h8300h_irq_chip = { | |
| 59 | .name = "H8/300H-INTC", | |
| 60 | .irq_enable = h8300h_enable_irq, | |
| 61 | .irq_disable = h8300h_disable_irq, | |
| 62 | }; | |
| 63 | ||
| 64 | static int irq_map(struct irq_domain *h, unsigned int virq, | |
| 65 | irq_hw_number_t hw_irq_num) | |
| 66 | { | |
| 67 | irq_set_chip_and_handler(virq, &h8300h_irq_chip, handle_simple_irq); | |
| 68 | ||
| 69 | return 0; | |
| 70 | } | |
| 71 | ||
| 72 | static struct irq_domain_ops irq_ops = { | |
| 73 | .map = irq_map, | |
| 74 | .xlate = irq_domain_xlate_onecell, | |
| 75 | }; | |
| 76 | ||
| 77 | static int __init h8300h_intc_of_init(struct device_node *intc, | |
| 78 | struct device_node *parent) | |
| 79 | { | |
| 80 | struct irq_domain *domain; | |
| 81 | ||
| 82 | intc_baseaddr = of_iomap(intc, 0); | |
| 83 | BUG_ON(!intc_baseaddr); | |
| 84 | ||
| 85 | /* All interrupt priority low */ | |
| 86 | ctrl_outb(0x00, IPR + 0); | |
| 87 | ctrl_outb(0x00, IPR + 1); | |
| 88 | ||
| 89 | domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL); | |
| 90 | BUG_ON(!domain); | |
| 91 | irq_set_default_host(domain); | |
| 92 | return 0; | |
| 93 | } | |
| 94 | ||
| 95 | IRQCHIP_DECLARE(h8300h_intc, "renesas,h8300h-intc", h8300h_intc_of_init); |