arch/sh/boards/mach-se/7343/irq.c

   1 /*
   2  * Hitachi UL SolutionEngine 7343 FPGA IRQ Support.
   3  *
   4  * Copyright (C) 2008  Yoshihiro Shimoda
   5  * Copyright (C) 2012  Paul Mundt
   6  *
   7  * Based on linux/arch/sh/boards/se/7343/irq.c
   8  * Copyright (C) 2007  Nobuhiro Iwamatsu
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file "COPYING" in the main directory of this archive
  12  * for more details.
  13  */
  14 #define DRV_NAME "SE7343-FPGA"
  15 #define pr_fmt(fmt) DRV_NAME ": " fmt
  16
  17 #include <linux/init.h>
  18 #include <linux/irq.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/irqdomain.h>
  21 #include <linux/io.h>
  22 #include <asm/sizes.h>
  23 #include <mach-se/mach/se7343.h>
  24
  25 #define PA_CPLD_BASE_ADDR       0x11400000
  26 #define PA_CPLD_ST_REG          0x08    /* CPLD Interrupt status register */
  27 #define PA_CPLD_IMSK_REG        0x0a    /* CPLD Interrupt mask register */
  28
  29 static void __iomem *se7343_irq_regs;
  30 struct irq_domain *se7343_irq_domain;
  31
  32 static void se7343_irq_demux(struct irq_desc *desc)
  33 {
  34         struct irq_data *data = irq_desc_get_irq_data(desc);
  35         struct irq_chip *chip = irq_data_get_irq_chip(data);
  36         unsigned long mask;
  37         int bit;
  38
  39         chip->irq_mask_ack(data);
  40
  41         mask = ioread16(se7343_irq_regs + PA_CPLD_ST_REG);
  42
  43         for_each_set_bit(bit, &mask, SE7343_FPGA_IRQ_NR)
  44                 generic_handle_irq(irq_linear_revmap(se7343_irq_domain, bit));
  45
  46         chip->irq_unmask(data);
  47 }
  48
  49 static void __init se7343_domain_init(void)
  50 {
  51         int i;
  52
  53         se7343_irq_domain = irq_domain_add_linear(NULL, SE7343_FPGA_IRQ_NR,
  54                                                   &irq_domain_simple_ops, NULL);
  55         if (unlikely(!se7343_irq_domain)) {
  56                 printk("Failed to get IRQ domain\n");
  57                 return;
  58         }
  59
  60         for (i = 0; i < SE7343_FPGA_IRQ_NR; i++) {
  61                 int irq = irq_create_mapping(se7343_irq_domain, i);
  62
  63                 if (unlikely(irq == 0)) {
  64                         printk("Failed to allocate IRQ %d\n", i);
  65                         return;
  66                 }
  67         }
  68 }
  69
  70 static void __init se7343_gc_init(void)
  71 {
  72         struct irq_chip_generic *gc;
  73         struct irq_chip_type *ct;
  74         unsigned int irq_base;
  75
  76         irq_base = irq_linear_revmap(se7343_irq_domain, 0);
  77
  78         gc = irq_alloc_generic_chip(DRV_NAME, 1, irq_base, se7343_irq_regs,
  79                                     handle_level_irq);
  80         if (unlikely(!gc))
  81                 return;
  82
  83         ct = gc->chip_types;
  84         ct->chip.irq_mask = irq_gc_mask_set_bit;
  85         ct->chip.irq_unmask = irq_gc_mask_clr_bit;
  86
  87         ct->regs.mask = PA_CPLD_IMSK_REG;
  88
  89         irq_setup_generic_chip(gc, IRQ_MSK(SE7343_FPGA_IRQ_NR),
  90                                IRQ_GC_INIT_MASK_CACHE,
  91                                IRQ_NOREQUEST | IRQ_NOPROBE, 0);
  92
  93         irq_set_chained_handler(IRQ0_IRQ, se7343_irq_demux);
  94         irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
  95
  96         irq_set_chained_handler(IRQ1_IRQ, se7343_irq_demux);
  97         irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
  98
  99         irq_set_chained_handler(IRQ4_IRQ, se7343_irq_demux);
 100         irq_set_irq_type(IRQ4_IRQ, IRQ_TYPE_LEVEL_LOW);
 101
 102         irq_set_chained_handler(IRQ5_IRQ, se7343_irq_demux);
 103         irq_set_irq_type(IRQ5_IRQ, IRQ_TYPE_LEVEL_LOW);
 104 }
 105
 106 /*
 107  * Initialize IRQ setting
 108  */
 109 void __init init_7343se_IRQ(void)
 110 {
 111         se7343_irq_regs = ioremap(PA_CPLD_BASE_ADDR, SZ_16);
 112         if (unlikely(!se7343_irq_regs)) {
 113                 pr_err("Failed to remap CPLD\n");
 114                 return;
 115         }
 116
 117         /*
 118          * All FPGA IRQs disabled by default
 119          */
 120         iowrite16(0, se7343_irq_regs + PA_CPLD_IMSK_REG);
 121
 122         __raw_writew(0x2000, 0xb03fffec);       /* mrshpc irq enable */
 123
 124         se7343_domain_init();
 125         se7343_gc_init();
 126 }