arch/sh/kernel/cpu/irq/ipr.c

   1 /*
   2  * Interrupt handling for IPR-based IRQ.
   3  *
   4  * Copyright (C) 1999  Niibe Yutaka & Takeshi Yaegashi
   5  * Copyright (C) 2000  Kazumoto Kojima
   6  * Copyright (C) 2003  Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
   7  * Copyright (C) 2006  Paul Mundt
   8  *
   9  * Supported system:
  10  *      On-chip supporting modules (TMU, RTC, etc.).
  11  *      On-chip supporting modules for SH7709/SH7709A/SH7729/SH7300.
  12  *      Hitachi SolutionEngine external I/O:
  13  *              MS7709SE01, MS7709ASE01, and MS7750SE01
  14  *
  15  * This file is subject to the terms and conditions of the GNU General Public
  16  * License.  See the file "COPYING" in the main directory of this archive
  17  * for more details.
  18  */
  19 #include <linux/init.h>
  20 #include <linux/irq.h>
  21 #include <linux/module.h>
  22 #include <asm/system.h>
  23 #include <asm/io.h>
  24 #include <asm/machvec.h>
  25
  26 struct ipr_data {
  27         unsigned int addr;      /* Address of Interrupt Priority Register */
  28         int shift;              /* Shifts of the 16-bit data */
  29         int priority;           /* The priority */
  30 };
  31
  32 static void disable_ipr_irq(unsigned int irq)
  33 {
  34         struct ipr_data *p = get_irq_chip_data(irq);
  35         /* Set the priority in IPR to 0 */
  36         ctrl_outw(ctrl_inw(p->addr) & (0xffff ^ (0xf << p->shift)), p->addr);
  37 }
  38
  39 static void enable_ipr_irq(unsigned int irq)
  40 {
  41         struct ipr_data *p = get_irq_chip_data(irq);
  42         /* Set priority in IPR back to original value */
  43         ctrl_outw(ctrl_inw(p->addr) | (p->priority << p->shift), p->addr);
  44 }
  45
  46 static struct irq_chip ipr_irq_chip = {
  47         .name           = "ipr",
  48         .mask           = disable_ipr_irq,
  49         .unmask         = enable_ipr_irq,
  50         .mask_ack       = disable_ipr_irq,
  51 };
  52
  53 void make_ipr_irq(unsigned int irq, unsigned int addr, int pos, int priority)
  54 {
  55         struct ipr_data ipr_data;
  56
  57         disable_irq_nosync(irq);
  58
  59         ipr_data.addr = addr;
  60         ipr_data.shift = pos*4; /* POSition (0-3) x 4 means shift */
  61         ipr_data.priority = priority;
  62
  63         set_irq_chip_and_handler(irq, &ipr_irq_chip, handle_level_irq);
  64         set_irq_chip_data(irq, &ipr_data);
  65
  66         enable_ipr_irq(irq);
  67 }
  68
  69 /* XXX: This needs to die a horrible death.. */
  70 void __init init_IRQ(void)
  71 {
  72 #ifndef CONFIG_CPU_SUBTYPE_SH7780
  73         make_ipr_irq(TIMER_IRQ, TIMER_IPR_ADDR, TIMER_IPR_POS, TIMER_PRIORITY);
  74         make_ipr_irq(TIMER1_IRQ, TIMER1_IPR_ADDR, TIMER1_IPR_POS, TIMER1_PRIORITY);
  75 #ifdef RTC_IRQ
  76         make_ipr_irq(RTC_IRQ, RTC_IPR_ADDR, RTC_IPR_POS, RTC_PRIORITY);
  77 #endif
  78
  79 #ifdef SCI_ERI_IRQ
  80         make_ipr_irq(SCI_ERI_IRQ, SCI_IPR_ADDR, SCI_IPR_POS, SCI_PRIORITY);
  81         make_ipr_irq(SCI_RXI_IRQ, SCI_IPR_ADDR, SCI_IPR_POS, SCI_PRIORITY);
  82         make_ipr_irq(SCI_TXI_IRQ, SCI_IPR_ADDR, SCI_IPR_POS, SCI_PRIORITY);
  83 #endif
  84
  85 #ifdef SCIF1_ERI_IRQ
  86         make_ipr_irq(SCIF1_ERI_IRQ, SCIF1_IPR_ADDR, SCIF1_IPR_POS, SCIF1_PRIORITY);
  87         make_ipr_irq(SCIF1_RXI_IRQ, SCIF1_IPR_ADDR, SCIF1_IPR_POS, SCIF1_PRIORITY);
  88         make_ipr_irq(SCIF1_BRI_IRQ, SCIF1_IPR_ADDR, SCIF1_IPR_POS, SCIF1_PRIORITY);
  89         make_ipr_irq(SCIF1_TXI_IRQ, SCIF1_IPR_ADDR, SCIF1_IPR_POS, SCIF1_PRIORITY);
  90 #endif
  91
  92 #if defined(CONFIG_CPU_SUBTYPE_SH7300)
  93         make_ipr_irq(SCIF0_IRQ, SCIF0_IPR_ADDR, SCIF0_IPR_POS, SCIF0_PRIORITY);
  94         make_ipr_irq(DMTE2_IRQ, DMA1_IPR_ADDR, DMA1_IPR_POS, DMA1_PRIORITY);
  95         make_ipr_irq(DMTE3_IRQ, DMA1_IPR_ADDR, DMA1_IPR_POS, DMA1_PRIORITY);
  96         make_ipr_irq(VIO_IRQ, VIO_IPR_ADDR, VIO_IPR_POS, VIO_PRIORITY);
  97 #endif
  98
  99 #ifdef SCIF_ERI_IRQ
 100         make_ipr_irq(SCIF_ERI_IRQ, SCIF_IPR_ADDR, SCIF_IPR_POS, SCIF_PRIORITY);
 101         make_ipr_irq(SCIF_RXI_IRQ, SCIF_IPR_ADDR, SCIF_IPR_POS, SCIF_PRIORITY);
 102         make_ipr_irq(SCIF_BRI_IRQ, SCIF_IPR_ADDR, SCIF_IPR_POS, SCIF_PRIORITY);
 103         make_ipr_irq(SCIF_TXI_IRQ, SCIF_IPR_ADDR, SCIF_IPR_POS, SCIF_PRIORITY);
 104 #endif
 105
 106 #ifdef IRDA_ERI_IRQ
 107         make_ipr_irq(IRDA_ERI_IRQ, IRDA_IPR_ADDR, IRDA_IPR_POS, IRDA_PRIORITY);
 108         make_ipr_irq(IRDA_RXI_IRQ, IRDA_IPR_ADDR, IRDA_IPR_POS, IRDA_PRIORITY);
 109         make_ipr_irq(IRDA_BRI_IRQ, IRDA_IPR_ADDR, IRDA_IPR_POS, IRDA_PRIORITY);
 110         make_ipr_irq(IRDA_TXI_IRQ, IRDA_IPR_ADDR, IRDA_IPR_POS, IRDA_PRIORITY);
 111 #endif
 112
 113 #if defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709) || \
 114     defined(CONFIG_CPU_SUBTYPE_SH7706) || \
 115     defined(CONFIG_CPU_SUBTYPE_SH7300) || defined(CONFIG_CPU_SUBTYPE_SH7705)
 116         /*
 117          * Initialize the Interrupt Controller (INTC)
 118          * registers to their power on values
 119          */
 120
 121         /*
 122          * Enable external irq (INTC IRQ mode).
 123          * You should set corresponding bits of PFC to "00"
 124          * to enable these interrupts.
 125          */
 126         make_ipr_irq(IRQ0_IRQ, IRQ0_IPR_ADDR, IRQ0_IPR_POS, IRQ0_PRIORITY);
 127         make_ipr_irq(IRQ1_IRQ, IRQ1_IPR_ADDR, IRQ1_IPR_POS, IRQ1_PRIORITY);
 128         make_ipr_irq(IRQ2_IRQ, IRQ2_IPR_ADDR, IRQ2_IPR_POS, IRQ2_PRIORITY);
 129         make_ipr_irq(IRQ3_IRQ, IRQ3_IPR_ADDR, IRQ3_IPR_POS, IRQ3_PRIORITY);
 130         make_ipr_irq(IRQ4_IRQ, IRQ4_IPR_ADDR, IRQ4_IPR_POS, IRQ4_PRIORITY);
 131         make_ipr_irq(IRQ5_IRQ, IRQ5_IPR_ADDR, IRQ5_IPR_POS, IRQ5_PRIORITY);
 132 #endif
 133 #endif
 134
 135 #ifdef CONFIG_CPU_HAS_PINT_IRQ
 136         init_IRQ_pint();
 137 #endif
 138
 139 #ifdef CONFIG_CPU_HAS_INTC2_IRQ
 140         init_IRQ_intc2();
 141 #endif
 142         /* Perform the machine specific initialisation */
 143         if (sh_mv.mv_init_irq != NULL)
 144                 sh_mv.mv_init_irq();
 145
 146         irq_ctx_init(smp_processor_id());
 147 }
 148
 149 #if !defined(CONFIG_CPU_HAS_PINT_IRQ)
 150 int ipr_irq_demux(int irq)
 151 {
 152         return irq;
 153 }
 154 #endif
 155
 156 EXPORT_SYMBOL(make_ipr_irq);