arch/sh/cchips/hd6446x/hd64465/setup.c

   1 /*
   2  * $Id: setup.c,v 1.4 2003/08/03 03:05:10 lethal Exp $
   3  *
   4  * Setup and IRQ handling code for the HD64465 companion chip.
   5  * by Greg Banks <gbanks@pocketpenguins.com>
   6  * Copyright (c) 2000 PocketPenguins Inc
   7  *
   8  * Derived from setup_hd64461.c which bore the message:
   9  * Copyright (C) 2000 YAEGASHI Takeshi
  10  */
  11
  12 #include <linux/sched.h>
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/param.h>
  16 #include <linux/ioport.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/init.h>
  19 #include <linux/irq.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/irq.h>
  23
  24 #include <asm/hd64465/hd64465.h>
  25
  26 static void disable_hd64465_irq(unsigned int irq)
  27 {
  28         unsigned long flags;
  29         unsigned short nimr;
  30         unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);
  31
  32         pr_debug("disable_hd64465_irq(%d): mask=%x\n", irq, mask);
  33         local_irq_save(flags);
  34         nimr = inw(HD64465_REG_NIMR);
  35         nimr |= mask;
  36         outw(nimr, HD64465_REG_NIMR);
  37         local_irq_restore(flags);
  38 }
  39
  40
  41 static void enable_hd64465_irq(unsigned int irq)
  42 {
  43         unsigned long flags;
  44         unsigned short nimr;
  45         unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);
  46
  47         pr_debug("enable_hd64465_irq(%d): mask=%x\n", irq, mask);
  48         local_irq_save(flags);
  49         nimr = inw(HD64465_REG_NIMR);
  50         nimr &= ~mask;
  51         outw(nimr, HD64465_REG_NIMR);
  52         local_irq_restore(flags);
  53 }
  54
  55
  56 static void mask_and_ack_hd64465(unsigned int irq)
  57 {
  58         disable_hd64465_irq(irq);
  59 }
  60
  61
  62 static void end_hd64465_irq(unsigned int irq)
  63 {
  64         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  65                 enable_hd64465_irq(irq);
  66 }
  67
  68
  69 static unsigned int startup_hd64465_irq(unsigned int irq)
  70 {
  71         enable_hd64465_irq(irq);
  72         return 0;
  73 }
  74
  75
  76 static void shutdown_hd64465_irq(unsigned int irq)
  77 {
  78         disable_hd64465_irq(irq);
  79 }
  80
  81
  82 static struct hw_interrupt_type hd64465_irq_type = {
  83         .typename       = "HD64465-IRQ",
  84         .startup        = startup_hd64465_irq,
  85         .shutdown       = shutdown_hd64465_irq,
  86         .enable         = enable_hd64465_irq,
  87         .disable        = disable_hd64465_irq,
  88         .ack            = mask_and_ack_hd64465,
  89         .end            = end_hd64465_irq,
  90 };
  91
  92
  93 static irqreturn_t hd64465_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  94 {
  95         printk(KERN_INFO
  96                "HD64465: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
  97                inw(HD64465_REG_NIRR), inw(HD64465_REG_NIMR));
  98
  99         return IRQ_NONE;
 100 }
 101
 102
 103 /*====================================================*/
 104
 105 /*
 106  * Support for a secondary IRQ demux step.  This is necessary
 107  * because the HD64465 presents a very thin interface to the
 108  * PCMCIA bus; a lot of features (such as remapping interrupts)
 109  * normally done in hardware by other PCMCIA host bridges is
 110  * instead done in software.
 111  */
 112 static struct
 113 {
 114     int (*func)(int, void *);
 115     void *dev;
 116 } hd64465_demux[HD64465_IRQ_NUM];
 117
 118 void hd64465_register_irq_demux(int irq,
 119                 int (*demux)(int irq, void *dev), void *dev)
 120 {
 121         hd64465_demux[irq - HD64465_IRQ_BASE].func = demux;
 122         hd64465_demux[irq - HD64465_IRQ_BASE].dev = dev;
 123 }
 124 EXPORT_SYMBOL(hd64465_register_irq_demux);
 125
 126 void hd64465_unregister_irq_demux(int irq)
 127 {
 128         hd64465_demux[irq - HD64465_IRQ_BASE].func = 0;
 129 }
 130 EXPORT_SYMBOL(hd64465_unregister_irq_demux);
 131
 132
 133
 134 int hd64465_irq_demux(int irq)
 135 {
 136         if (irq == CONFIG_HD64465_IRQ) {
 137                 unsigned short i, bit;
 138                 unsigned short nirr = inw(HD64465_REG_NIRR);
 139                 unsigned short nimr = inw(HD64465_REG_NIMR);
 140
 141                 pr_debug("hd64465_irq_demux, nirr=%04x, nimr=%04x\n", nirr, nimr);
 142                 nirr &= ~nimr;
 143                 for (bit = 1, i = 0 ; i < HD64465_IRQ_NUM ; bit <<= 1, i++)
 144                     if (nirr & bit)
 145                         break;
 146
 147                 if (i < HD64465_IRQ_NUM) {
 148                     irq = HD64465_IRQ_BASE + i;
 149                     if (hd64465_demux[i].func != 0)
 150                         irq = hd64465_demux[i].func(irq, hd64465_demux[i].dev);
 151                 }
 152         }
 153         return irq;
 154 }
 155
 156 static struct irqaction irq0  = { hd64465_interrupt, IRQF_DISABLED, CPU_MASK_NONE, "HD64465", NULL, NULL};
 157
 158
 159 static int __init setup_hd64465(void)
 160 {
 161         int i;
 162         unsigned short rev;
 163         unsigned short smscr;
 164
 165         if (!MACH_HD64465)
 166                 return 0;
 167
 168         printk(KERN_INFO "HD64465 configured at 0x%x on irq %d(mapped into %d to %d)\n",
 169                CONFIG_HD64465_IOBASE,
 170                CONFIG_HD64465_IRQ,
 171                HD64465_IRQ_BASE,
 172                HD64465_IRQ_BASE+HD64465_IRQ_NUM-1);
 173
 174         if (inw(HD64465_REG_SDID) != HD64465_SDID) {
 175                 printk(KERN_ERR "HD64465 device ID not found, check base address\n");
 176         }
 177
 178         rev = inw(HD64465_REG_SRR);
 179         printk(KERN_INFO "HD64465 hardware revision %d.%d\n", (rev >> 8) & 0xff, rev & 0xff);
 180
 181         outw(0xffff, HD64465_REG_NIMR);         /* mask all interrupts */
 182
 183         for (i = 0; i < HD64465_IRQ_NUM ; i++) {
 184                 irq_desc[HD64465_IRQ_BASE + i].chip = &hd64465_irq_type;
 185         }
 186
 187         setup_irq(CONFIG_HD64465_IRQ, &irq0);
 188
 189 #ifdef CONFIG_SERIAL
 190         /* wake up the UART from STANDBY at this point */
 191         smscr = inw(HD64465_REG_SMSCR);
 192         outw(smscr & (~HD64465_SMSCR_UARTST), HD64465_REG_SMSCR);
 193
 194         /* remap IO ports for first ISA serial port to HD64465 UART */
 195         hd64465_port_map(0x3f8, 8, CONFIG_HD64465_IOBASE + 0x8000, 1);
 196 #endif
 197
 198         return 0;
 199 }
 200
 201 module_init(setup_hd64465);