arch/sh/boards/mach-se/7724/irq.c

   1 /*
   2  * linux/arch/sh/boards/se/7724/irq.c
   3  *
   4  * Copyright (C) 2009 Renesas Solutions Corp.
   5  *
   6  * Kuninori Morimoto <morimoto.kuninori@renesas.com>
   7  *
   8  * Based on  linux/arch/sh/boards/se/7722/irq.c
   9  * Copyright (C) 2007  Nobuhiro Iwamatsu
  10  *
  11  * Hitachi UL SolutionEngine 7724 Support.
  12  *
  13  * This file is subject to the terms and conditions of the GNU General Public
  14  * License.  See the file "COPYING" in the main directory of this archive
  15  * for more details.
  16  */
  17 #include <linux/init.h>
  18 #include <linux/irq.h>
  19 #include <linux/interrupt.h>
  20 #include <asm/irq.h>
  21 #include <asm/io.h>
  22 #include <mach-se/mach/se7724.h>
  23
  24 struct fpga_irq {
  25         unsigned long  sraddr;
  26         unsigned long  mraddr;
  27         unsigned short mask;
  28         unsigned int   base;
  29 };
  30
  31 static unsigned int fpga2irq(unsigned int irq)
  32 {
  33         if (irq >= IRQ0_BASE &&
  34             irq <= IRQ0_END)
  35                 return IRQ0_IRQ;
  36         else if (irq >= IRQ1_BASE &&
  37                  irq <= IRQ1_END)
  38                 return IRQ1_IRQ;
  39         else
  40                 return IRQ2_IRQ;
  41 }
  42
  43 static struct fpga_irq get_fpga_irq(unsigned int irq)
  44 {
  45         struct fpga_irq set;
  46
  47         switch (irq) {
  48         case IRQ0_IRQ:
  49                 set.sraddr = IRQ0_SR;
  50                 set.mraddr = IRQ0_MR;
  51                 set.mask   = IRQ0_MASK;
  52                 set.base   = IRQ0_BASE;
  53                 break;
  54         case IRQ1_IRQ:
  55                 set.sraddr = IRQ1_SR;
  56                 set.mraddr = IRQ1_MR;
  57                 set.mask   = IRQ1_MASK;
  58                 set.base   = IRQ1_BASE;
  59                 break;
  60         default:
  61                 set.sraddr = IRQ2_SR;
  62                 set.mraddr = IRQ2_MR;
  63                 set.mask   = IRQ2_MASK;
  64                 set.base   = IRQ2_BASE;
  65                 break;
  66         }
  67
  68         return set;
  69 }
  70
  71 static void disable_se7724_irq(unsigned int irq)
  72 {
  73         struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
  74         unsigned int bit = irq - set.base;
  75         __raw_writew(__raw_readw(set.mraddr) | 0x0001 << bit, set.mraddr);
  76 }
  77
  78 static void enable_se7724_irq(unsigned int irq)
  79 {
  80         struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
  81         unsigned int bit = irq - set.base;
  82         __raw_writew(__raw_readw(set.mraddr) & ~(0x0001 << bit), set.mraddr);
  83 }
  84
  85 static struct irq_chip se7724_irq_chip __read_mostly = {
  86         .name           = "SE7724-FPGA",
  87         .mask           = disable_se7724_irq,
  88         .unmask         = enable_se7724_irq,
  89         .mask_ack       = disable_se7724_irq,
  90 };
  91
  92 static void se7724_irq_demux(unsigned int irq, struct irq_desc *desc)
  93 {
  94         struct fpga_irq set = get_fpga_irq(irq);
  95         unsigned short intv = __raw_readw(set.sraddr);
  96         unsigned int ext_irq = set.base;
  97
  98         intv &= set.mask;
  99
 100         for (; intv; intv >>= 1, ext_irq++) {
 101                 if (!(intv & 1))
 102                         continue;
 103
 104                 generic_handle_irq(ext_irq);
 105         }
 106 }
 107
 108 /*
 109  * Initialize IRQ setting
 110  */
 111 void __init init_se7724_IRQ(void)
 112 {
 113         int i, nid = cpu_to_node(boot_cpu_data);
 114
 115         __raw_writew(0xffff, IRQ0_MR);  /* mask all */
 116         __raw_writew(0xffff, IRQ1_MR);  /* mask all */
 117         __raw_writew(0xffff, IRQ2_MR);  /* mask all */
 118         __raw_writew(0x0000, IRQ0_SR);  /* clear irq */
 119         __raw_writew(0x0000, IRQ1_SR);  /* clear irq */
 120         __raw_writew(0x0000, IRQ2_SR);  /* clear irq */
 121         __raw_writew(0x002a, IRQ_MODE); /* set irq type */
 122
 123         for (i = 0; i < SE7724_FPGA_IRQ_NR; i++) {
 124                 int irq, wanted;
 125
 126                 wanted = SE7724_FPGA_IRQ_BASE + i;
 127
 128                 irq = create_irq_nr(wanted, nid);
 129                 if (unlikely(irq == 0)) {
 130                         pr_err("%s: failed hooking irq %d for FPGA\n",
 131                                __func__, wanted);
 132                         return;
 133                 }
 134
 135                 if (unlikely(irq != wanted)) {
 136                         pr_err("%s: got irq %d but wanted %d, bailing.\n",
 137                                __func__, irq, wanted);
 138                         destroy_irq(irq);
 139                         return;
 140                 }
 141
 142                 set_irq_chip_and_handler_name(irq,
 143                                               &se7724_irq_chip,
 144                                               handle_level_irq, "level");
 145         }
 146
 147         set_irq_chained_handler(IRQ0_IRQ, se7724_irq_demux);
 148         set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
 149
 150         set_irq_chained_handler(IRQ1_IRQ, se7724_irq_demux);
 151         set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
 152
 153         set_irq_chained_handler(IRQ2_IRQ, se7724_irq_demux);
 154         set_irq_type(IRQ2_IRQ, IRQ_TYPE_LEVEL_LOW);
 155 }