| Yoshinori Sato | 8a76448 | 2015-05-10 02:30:47 +0900 | [diff] [blame^] | 1 | /* |
| 2 | * H8S interrupt contoller driver |
| 3 | * |
| 4 | * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp> |
| 5 | */ |
| 6 | |
| 7 | #include <linux/irq.h> |
| 8 | #include <linux/of_address.h> |
| 9 | #include <linux/of_irq.h> |
| 10 | #include <asm/io.h> |
| 11 | #include "irqchip.h" |
| 12 | |
| 13 | static void *intc_baseaddr; |
| 14 | #define IPRA ((unsigned long)intc_baseaddr) |
| 15 | |
| 16 | static const unsigned char ipr_table[] = { |
| 17 | 0x03, 0x02, 0x01, 0x00, 0x13, 0x12, 0x11, 0x10, /* 16 - 23 */ |
| 18 | 0x23, 0x22, 0x21, 0x20, 0x33, 0x32, 0x31, 0x30, /* 24 - 31 */ |
| 19 | 0x43, 0x42, 0x41, 0x40, 0x53, 0x53, 0x52, 0x52, /* 32 - 39 */ |
| 20 | 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, /* 40 - 47 */ |
| 21 | 0x50, 0x50, 0x50, 0x50, 0x63, 0x63, 0x63, 0x63, /* 48 - 55 */ |
| 22 | 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, /* 56 - 63 */ |
| 23 | 0x61, 0x61, 0x61, 0x61, 0x60, 0x60, 0x60, 0x60, /* 64 - 71 */ |
| 24 | 0x73, 0x73, 0x73, 0x73, 0x72, 0x72, 0x72, 0x72, /* 72 - 79 */ |
| 25 | 0x71, 0x71, 0x71, 0x71, 0x70, 0x83, 0x82, 0x81, /* 80 - 87 */ |
| 26 | 0x80, 0x80, 0x80, 0x80, 0x93, 0x93, 0x93, 0x93, /* 88 - 95 */ |
| 27 | 0x92, 0x92, 0x92, 0x92, 0x91, 0x91, 0x91, 0x91, /* 96 - 103 */ |
| 28 | 0x90, 0x90, 0x90, 0x90, 0xa3, 0xa3, 0xa3, 0xa3, /* 104 - 111 */ |
| 29 | 0xa2, 0xa2, 0xa2, 0xa2, 0xa1, 0xa1, 0xa1, 0xa1, /* 112 - 119 */ |
| 30 | 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, /* 120 - 127 */ |
| 31 | }; |
| 32 | |
| 33 | static void h8s_disable_irq(struct irq_data *data) |
| 34 | { |
| 35 | int pos; |
| 36 | unsigned int addr; |
| 37 | unsigned short pri; |
| 38 | int irq = data->irq; |
| 39 | |
| 40 | addr = IPRA + ((ipr_table[irq - 16] & 0xf0) >> 3); |
| 41 | pos = (ipr_table[irq - 16] & 0x0f) * 4; |
| 42 | pri = ~(0x000f << pos); |
| 43 | pri &= ctrl_inw(addr); |
| 44 | ctrl_outw(pri, addr); |
| 45 | } |
| 46 | |
| 47 | static void h8s_enable_irq(struct irq_data *data) |
| 48 | { |
| 49 | int pos; |
| 50 | unsigned int addr; |
| 51 | unsigned short pri; |
| 52 | int irq = data->irq; |
| 53 | |
| 54 | addr = IPRA + ((ipr_table[irq - 16] & 0xf0) >> 3); |
| 55 | pos = (ipr_table[irq - 16] & 0x0f) * 4; |
| 56 | pri = ~(0x000f << pos); |
| 57 | pri &= ctrl_inw(addr); |
| 58 | pri |= 1 << pos; |
| 59 | ctrl_outw(pri, addr); |
| 60 | } |
| 61 | |
| 62 | struct irq_chip h8s_irq_chip = { |
| 63 | .name = "H8S-INTC", |
| 64 | .irq_enable = h8s_enable_irq, |
| 65 | .irq_disable = h8s_disable_irq, |
| 66 | }; |
| 67 | |
| 68 | static __init int irq_map(struct irq_domain *h, unsigned int virq, |
| 69 | irq_hw_number_t hw_irq_num) |
| 70 | { |
| 71 | irq_set_chip_and_handler(virq, &h8s_irq_chip, handle_simple_irq); |
| 72 | |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static struct irq_domain_ops irq_ops = { |
| 77 | .map = irq_map, |
| 78 | .xlate = irq_domain_xlate_onecell, |
| 79 | }; |
| 80 | |
| 81 | static int __init h8s_intc_of_init(struct device_node *intc, |
| 82 | struct device_node *parent) |
| 83 | { |
| 84 | struct irq_domain *domain; |
| 85 | int n; |
| 86 | |
| 87 | intc_baseaddr = of_iomap(intc, 0); |
| 88 | BUG_ON(!intc_baseaddr); |
| 89 | |
| 90 | /* All interrupt priority is 0 (disable) */ |
| 91 | /* IPRA to IPRK */ |
| 92 | for (n = 0; n <= 'k' - 'a'; n++) |
| 93 | ctrl_outw(0x0000, IPRA + (n * 2)); |
| 94 | |
| 95 | domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL); |
| 96 | BUG_ON(!domain); |
| 97 | irq_set_default_host(domain); |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | IRQCHIP_DECLARE(h8s_intc, "renesas,h8s-intc", h8s_intc_of_init); |