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 <linux/export.h>
  21 #include <linux/topology.h>
  22 #include <linux/io.h>
  23 #include <linux/err.h>
  24 #include <mach-se/mach/se7724.h>
  25
  26 struct fpga_irq {
  27         unsigned long  sraddr;
  28         unsigned long  mraddr;
  29         unsigned short mask;
  30         unsigned int   base;
  31 };
  32
  33 static unsigned int fpga2irq(unsigned int irq)
  34 {
  35         if (irq >= IRQ0_BASE &&
  36             irq <= IRQ0_END)
  37                 return IRQ0_IRQ;
  38         else if (irq >= IRQ1_BASE &&
  39                  irq <= IRQ1_END)
  40                 return IRQ1_IRQ;
  41         else
  42                 return IRQ2_IRQ;
  43 }
  44
  45 static struct fpga_irq get_fpga_irq(unsigned int irq)
  46 {
  47         struct fpga_irq set;
  48
  49         switch (irq) {
  50         case IRQ0_IRQ:
  51                 set.sraddr = IRQ0_SR;
  52                 set.mraddr = IRQ0_MR;
  53                 set.mask   = IRQ0_MASK;
  54                 set.base   = IRQ0_BASE;
  55                 break;
  56         case IRQ1_IRQ:
  57                 set.sraddr = IRQ1_SR;
  58                 set.mraddr = IRQ1_MR;
  59                 set.mask   = IRQ1_MASK;
  60                 set.base   = IRQ1_BASE;
  61                 break;
  62         default:
  63                 set.sraddr = IRQ2_SR;
  64                 set.mraddr = IRQ2_MR;
  65                 set.mask   = IRQ2_MASK;
  66                 set.base   = IRQ2_BASE;
  67                 break;
  68         }
  69
  70         return set;
  71 }
  72
  73 static void disable_se7724_irq(struct irq_data *data)
  74 {
  75         unsigned int irq = data->irq;
  76         struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
  77         unsigned int bit = irq - set.base;
  78         __raw_writew(__raw_readw(set.mraddr) | 0x0001 << bit, set.mraddr);
  79 }
  80
  81 static void enable_se7724_irq(struct irq_data *data)
  82 {
  83         unsigned int irq = data->irq;
  84         struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
  85         unsigned int bit = irq - set.base;
  86         __raw_writew(__raw_readw(set.mraddr) & ~(0x0001 << bit), set.mraddr);
  87 }
  88
  89 static struct irq_chip se7724_irq_chip __read_mostly = {
  90         .name           = "SE7724-FPGA",
  91         .irq_mask       = disable_se7724_irq,
  92         .irq_unmask     = enable_se7724_irq,
  93 };
  94
  95 static void se7724_irq_demux(unsigned int irq, struct irq_desc *desc)
  96 {
  97         struct fpga_irq set = get_fpga_irq(irq);
  98         unsigned short intv = __raw_readw(set.sraddr);
  99         unsigned int ext_irq = set.base;
 100
 101         intv &= set.mask;
 102
 103         for (; intv; intv >>= 1, ext_irq++) {
 104                 if (!(intv & 1))
 105                         continue;
 106
 107                 generic_handle_irq(ext_irq);
 108         }
 109 }
 110
 111 /*
 112  * Initialize IRQ setting
 113  */
 114 void __init init_se7724_IRQ(void)
 115 {
 116         int irq_base, i;
 117
 118         __raw_writew(0xffff, IRQ0_MR);  /* mask all */
 119         __raw_writew(0xffff, IRQ1_MR);  /* mask all */
 120         __raw_writew(0xffff, IRQ2_MR);  /* mask all */
 121         __raw_writew(0x0000, IRQ0_SR);  /* clear irq */
 122         __raw_writew(0x0000, IRQ1_SR);  /* clear irq */
 123         __raw_writew(0x0000, IRQ2_SR);  /* clear irq */
 124         __raw_writew(0x002a, IRQ_MODE); /* set irq type */
 125
 126         irq_base = irq_alloc_descs(SE7724_FPGA_IRQ_BASE, SE7724_FPGA_IRQ_BASE,
 127                                    SE7724_FPGA_IRQ_NR, numa_node_id());
 128         if (IS_ERR_VALUE(irq_base)) {
 129                 pr_err("%s: failed hooking irqs for FPGA\n", __func__);
 130                 return;
 131         }
 132
 133         for (i = 0; i < SE7724_FPGA_IRQ_NR; i++)
 134                 irq_set_chip_and_handler_name(irq_base + i, &se7724_irq_chip,
 135                                               handle_level_irq, "level");
 136
 137         irq_set_chained_handler(IRQ0_IRQ, se7724_irq_demux);
 138         irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
 139
 140         irq_set_chained_handler(IRQ1_IRQ, se7724_irq_demux);
 141         irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
 142
 143         irq_set_chained_handler(IRQ2_IRQ, se7724_irq_demux);
 144         irq_set_irq_type(IRQ2_IRQ, IRQ_TYPE_LEVEL_LOW);
 145 }