diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/irqchip/irq-renesas-h8s.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-renesas-h8s.c b/drivers/irqchip/irq-renesas-h8s.c new file mode 100644 index 000000000..85234d456 --- /dev/null +++ b/drivers/irqchip/irq-renesas-h8s.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * H8S interrupt contoller driver + * + * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp> + */ + +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <asm/io.h> + +static void *intc_baseaddr; +#define IPRA (intc_baseaddr) + +static const unsigned char ipr_table[] = { + 0x03, 0x02, 0x01, 0x00, 0x13, 0x12, 0x11, 0x10, /* 16 - 23 */ + 0x23, 0x22, 0x21, 0x20, 0x33, 0x32, 0x31, 0x30, /* 24 - 31 */ + 0x43, 0x42, 0x41, 0x40, 0x53, 0x53, 0x52, 0x52, /* 32 - 39 */ + 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, /* 40 - 47 */ + 0x50, 0x50, 0x50, 0x50, 0x63, 0x63, 0x63, 0x63, /* 48 - 55 */ + 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, /* 56 - 63 */ + 0x61, 0x61, 0x61, 0x61, 0x60, 0x60, 0x60, 0x60, /* 64 - 71 */ + 0x73, 0x73, 0x73, 0x73, 0x72, 0x72, 0x72, 0x72, /* 72 - 79 */ + 0x71, 0x71, 0x71, 0x71, 0x70, 0x83, 0x82, 0x81, /* 80 - 87 */ + 0x80, 0x80, 0x80, 0x80, 0x93, 0x93, 0x93, 0x93, /* 88 - 95 */ + 0x92, 0x92, 0x92, 0x92, 0x91, 0x91, 0x91, 0x91, /* 96 - 103 */ + 0x90, 0x90, 0x90, 0x90, 0xa3, 0xa3, 0xa3, 0xa3, /* 104 - 111 */ + 0xa2, 0xa2, 0xa2, 0xa2, 0xa1, 0xa1, 0xa1, 0xa1, /* 112 - 119 */ + 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, /* 120 - 127 */ +}; + +static void h8s_disable_irq(struct irq_data *data) +{ + int pos; + void __iomem *addr; + unsigned short pri; + int irq = data->irq; + + addr = IPRA + ((ipr_table[irq - 16] & 0xf0) >> 3); + pos = (ipr_table[irq - 16] & 0x0f) * 4; + pri = ~(0x000f << pos); + pri &= readw(addr); + writew(pri, addr); +} + +static void h8s_enable_irq(struct irq_data *data) +{ + int pos; + void __iomem *addr; + unsigned short pri; + int irq = data->irq; + + addr = IPRA + ((ipr_table[irq - 16] & 0xf0) >> 3); + pos = (ipr_table[irq - 16] & 0x0f) * 4; + pri = ~(0x000f << pos); + pri &= readw(addr); + pri |= 1 << pos; + writew(pri, addr); +} + +struct irq_chip h8s_irq_chip = { + .name = "H8S-INTC", + .irq_enable = h8s_enable_irq, + .irq_disable = h8s_disable_irq, +}; + +static __init int irq_map(struct irq_domain *h, unsigned int virq, + irq_hw_number_t hw_irq_num) +{ + irq_set_chip_and_handler(virq, &h8s_irq_chip, handle_simple_irq); + + return 0; +} + +static const struct irq_domain_ops irq_ops = { + .map = irq_map, + .xlate = irq_domain_xlate_onecell, +}; + +static int __init h8s_intc_of_init(struct device_node *intc, + struct device_node *parent) +{ + struct irq_domain *domain; + int n; + + intc_baseaddr = of_iomap(intc, 0); + BUG_ON(!intc_baseaddr); + + /* All interrupt priority is 0 (disable) */ + /* IPRA to IPRK */ + for (n = 0; n <= 'k' - 'a'; n++) + writew(0x0000, IPRA + (n * 2)); + + domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL); + BUG_ON(!domain); + irq_set_default_host(domain); + return 0; +} + +IRQCHIP_DECLARE(h8s_intc, "renesas,h8s-intc", h8s_intc_of_init); |