diff options
Diffstat (limited to 'kernel/arch/sh/boards/mach-se/7724/irq.c')
| -rw-r--r-- | kernel/arch/sh/boards/mach-se/7724/irq.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/kernel/arch/sh/boards/mach-se/7724/irq.c b/kernel/arch/sh/boards/mach-se/7724/irq.c new file mode 100644 index 000000000..5d1d3ec9a --- /dev/null +++ b/kernel/arch/sh/boards/mach-se/7724/irq.c @@ -0,0 +1,145 @@ +/* + * linux/arch/sh/boards/se/7724/irq.c + * + * Copyright (C) 2009 Renesas Solutions Corp. + * + * Kuninori Morimoto <morimoto.kuninori@renesas.com> + * + * Based on linux/arch/sh/boards/se/7722/irq.c + * Copyright (C) 2007 Nobuhiro Iwamatsu + * + * Hitachi UL SolutionEngine 7724 Support. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/export.h> +#include <linux/topology.h> +#include <linux/io.h> +#include <linux/err.h> +#include <mach-se/mach/se7724.h> + +struct fpga_irq { + unsigned long sraddr; + unsigned long mraddr; + unsigned short mask; + unsigned int base; +}; + +static unsigned int fpga2irq(unsigned int irq) +{ + if (irq >= IRQ0_BASE && + irq <= IRQ0_END) + return IRQ0_IRQ; + else if (irq >= IRQ1_BASE && + irq <= IRQ1_END) + return IRQ1_IRQ; + else + return IRQ2_IRQ; +} + +static struct fpga_irq get_fpga_irq(unsigned int irq) +{ + struct fpga_irq set; + + switch (irq) { + case IRQ0_IRQ: + set.sraddr = IRQ0_SR; + set.mraddr = IRQ0_MR; + set.mask = IRQ0_MASK; + set.base = IRQ0_BASE; + break; + case IRQ1_IRQ: + set.sraddr = IRQ1_SR; + set.mraddr = IRQ1_MR; + set.mask = IRQ1_MASK; + set.base = IRQ1_BASE; + break; + default: + set.sraddr = IRQ2_SR; + set.mraddr = IRQ2_MR; + set.mask = IRQ2_MASK; + set.base = IRQ2_BASE; + break; + } + + return set; +} + +static void disable_se7724_irq(struct irq_data *data) +{ + unsigned int irq = data->irq; + struct fpga_irq set = get_fpga_irq(fpga2irq(irq)); + unsigned int bit = irq - set.base; + __raw_writew(__raw_readw(set.mraddr) | 0x0001 << bit, set.mraddr); +} + +static void enable_se7724_irq(struct irq_data *data) +{ + unsigned int irq = data->irq; + struct fpga_irq set = get_fpga_irq(fpga2irq(irq)); + unsigned int bit = irq - set.base; + __raw_writew(__raw_readw(set.mraddr) & ~(0x0001 << bit), set.mraddr); +} + +static struct irq_chip se7724_irq_chip __read_mostly = { + .name = "SE7724-FPGA", + .irq_mask = disable_se7724_irq, + .irq_unmask = enable_se7724_irq, +}; + +static void se7724_irq_demux(unsigned int irq, struct irq_desc *desc) +{ + struct fpga_irq set = get_fpga_irq(irq); + unsigned short intv = __raw_readw(set.sraddr); + unsigned int ext_irq = set.base; + + intv &= set.mask; + + for (; intv; intv >>= 1, ext_irq++) { + if (!(intv & 1)) + continue; + + generic_handle_irq(ext_irq); + } +} + +/* + * Initialize IRQ setting + */ +void __init init_se7724_IRQ(void) +{ + int irq_base, i; + + __raw_writew(0xffff, IRQ0_MR); /* mask all */ + __raw_writew(0xffff, IRQ1_MR); /* mask all */ + __raw_writew(0xffff, IRQ2_MR); /* mask all */ + __raw_writew(0x0000, IRQ0_SR); /* clear irq */ + __raw_writew(0x0000, IRQ1_SR); /* clear irq */ + __raw_writew(0x0000, IRQ2_SR); /* clear irq */ + __raw_writew(0x002a, IRQ_MODE); /* set irq type */ + + irq_base = irq_alloc_descs(SE7724_FPGA_IRQ_BASE, SE7724_FPGA_IRQ_BASE, + SE7724_FPGA_IRQ_NR, numa_node_id()); + if (IS_ERR_VALUE(irq_base)) { + pr_err("%s: failed hooking irqs for FPGA\n", __func__); + return; + } + + for (i = 0; i < SE7724_FPGA_IRQ_NR; i++) + irq_set_chip_and_handler_name(irq_base + i, &se7724_irq_chip, + handle_level_irq, "level"); + + irq_set_chained_handler(IRQ0_IRQ, se7724_irq_demux); + irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW); + + irq_set_chained_handler(IRQ1_IRQ, se7724_irq_demux); + irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW); + + irq_set_chained_handler(IRQ2_IRQ, se7724_irq_demux); + irq_set_irq_type(IRQ2_IRQ, IRQ_TYPE_LEVEL_LOW); +} |