arch/mips/sni/a20r.c

   1 /*
   2  * A20R specific code
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2006 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/serial_8250.h>
  15
  16 #include <asm/sni.h>
  17 #include <asm/time.h>
  18
  19 #define PORT(_base,_irq)                                \
  20         {                                               \
  21                 .iobase         = _base,                \
  22                 .irq            = _irq,                 \
  23                 .uartclk        = 1843200,              \
  24                 .iotype         = UPIO_PORT,            \
  25                 .flags          = UPF_BOOT_AUTOCONF,    \
  26         }
  27
  28 static struct plat_serial8250_port a20r_data[] = {
  29         PORT(0x3f8, 4),
  30         PORT(0x2f8, 3),
  31         { },
  32 };
  33
  34 static struct platform_device a20r_serial8250_device = {
  35         .name                   = "serial8250",
  36         .id                     = PLAT8250_DEV_PLATFORM,
  37         .dev                    = {
  38                 .platform_data  = a20r_data,
  39         },
  40 };
  41
  42 static struct resource a20r_ds1216_rsrc[] = {
  43         {
  44                 .start = 0x1c081ffc,
  45                 .end   = 0x1c081fff,
  46                 .flags = IORESOURCE_MEM
  47         }
  48 };
  49
  50 static struct platform_device a20r_ds1216_device = {
  51         .name           = "rtc-ds1216",
  52         .num_resources  = ARRAY_SIZE(a20r_ds1216_rsrc),
  53         .resource       = a20r_ds1216_rsrc
  54 };
  55
  56 static struct resource snirm_82596_rsrc[] = {
  57         {
  58                 .start = 0x18000000,
  59                 .end   = 0x18000004,
  60                 .flags = IORESOURCE_MEM
  61         },
  62         {
  63                 .start = 0x18010000,
  64                 .end   = 0x18010004,
  65                 .flags = IORESOURCE_MEM
  66         },
  67         {
  68                 .start = 0x1ff00000,
  69                 .end   = 0x1ff00020,
  70                 .flags = IORESOURCE_MEM
  71         },
  72         {
  73                 .start = 22,
  74                 .end   = 22,
  75                 .flags = IORESOURCE_IRQ
  76         },
  77         {
  78                 .flags = 0x01                /* 16bit mpu port access */
  79         }
  80 };
  81
  82 static struct platform_device snirm_82596_pdev = {
  83         .name           = "snirm_82596",
  84         .num_resources  = ARRAY_SIZE(snirm_82596_rsrc),
  85         .resource       = snirm_82596_rsrc
  86 };
  87
  88 static struct resource snirm_53c710_rsrc[] = {
  89         {
  90                 .start = 0x19000000,
  91                 .end   = 0x190fffff,
  92                 .flags = IORESOURCE_MEM
  93         },
  94         {
  95                 .start = 19,
  96                 .end   = 19,
  97                 .flags = IORESOURCE_IRQ
  98         }
  99 };
 100
 101 static struct platform_device snirm_53c710_pdev = {
 102         .name           = "snirm_53c710",
 103         .num_resources  = ARRAY_SIZE(snirm_53c710_rsrc),
 104         .resource       = snirm_53c710_rsrc
 105 };
 106
 107 static struct resource sc26xx_rsrc[] = {
 108         {
 109                 .start = 0x1c070000,
 110                 .end   = 0x1c0700ff,
 111                 .flags = IORESOURCE_MEM
 112         },
 113         {
 114                 .start = 20,
 115                 .end   = 20,
 116                 .flags = IORESOURCE_IRQ
 117         }
 118 };
 119
 120 static struct platform_device sc26xx_pdev = {
 121         .name           = "SC26xx",
 122         .num_resources  = ARRAY_SIZE(sc26xx_rsrc),
 123         .resource       = sc26xx_rsrc
 124 };
 125
 126 static u32 a20r_ack_hwint(void)
 127 {
 128         u32 status = read_c0_status();
 129
 130         write_c0_status (status | 0x00010000);
 131         asm volatile(
 132         "       .set    push                    \n"
 133         "       .set    noat                    \n"
 134         "       .set    noreorder               \n"
 135         "       lw      $1, 0(%0)               \n"
 136         "       sb      $0, 0(%1)               \n"
 137         "       sync                            \n"
 138         "       lb      %1, 0(%1)               \n"
 139         "       b       1f                      \n"
 140         "       ori     %1, $1, 2               \n"
 141         "       .align  8                       \n"
 142         "1:                                     \n"
 143         "       nop                             \n"
 144         "       sw      %1, 0(%0)               \n"
 145         "       sync                            \n"
 146         "       li      %1, 0x20                \n"
 147         "2:                                     \n"
 148         "       nop                             \n"
 149         "       bnez    %1,2b                   \n"
 150         "       addiu   %1, -1                  \n"
 151         "       sw      $1, 0(%0)               \n"
 152         "       sync                            \n"
 153                 ".set   pop                     \n"
 154         :
 155         : "Jr" (PCIMT_UCONF), "Jr" (0xbc000000));
 156         write_c0_status(status);
 157
 158         return status;
 159 }
 160
 161 static inline void unmask_a20r_irq(unsigned int irq)
 162 {
 163         set_c0_status(0x100 << (irq - SNI_A20R_IRQ_BASE));
 164         irq_enable_hazard();
 165 }
 166
 167 static inline void mask_a20r_irq(unsigned int irq)
 168 {
 169         clear_c0_status(0x100 << (irq - SNI_A20R_IRQ_BASE));
 170         irq_disable_hazard();
 171 }
 172
 173 static void end_a20r_irq(unsigned int irq)
 174 {
 175         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
 176                 a20r_ack_hwint();
 177                 unmask_a20r_irq(irq);
 178         }
 179 }
 180
 181 static struct irq_chip a20r_irq_type = {
 182         .typename       = "A20R",
 183         .ack            = mask_a20r_irq,
 184         .mask           = mask_a20r_irq,
 185         .mask_ack       = mask_a20r_irq,
 186         .unmask         = unmask_a20r_irq,
 187         .end            = end_a20r_irq,
 188 };
 189
 190 /*
 191  * hwint 0 receive all interrupts
 192  */
 193 static void a20r_hwint(void)
 194 {
 195         u32 cause, status;
 196         int irq;
 197
 198         clear_c0_status (IE_IRQ0);
 199         status = a20r_ack_hwint();
 200         cause = read_c0_cause();
 201
 202         irq = ffs(((cause & status) >> 8) & 0xf8);
 203         if (likely(irq > 0))
 204                 do_IRQ(SNI_A20R_IRQ_BASE + irq - 1);
 205         set_c0_status(IE_IRQ0);
 206 }
 207
 208 void __init sni_a20r_irq_init(void)
 209 {
 210         int i;
 211
 212         for (i = SNI_A20R_IRQ_BASE + 2 ; i < SNI_A20R_IRQ_BASE + 8; i++)
 213                 set_irq_chip(i, &a20r_irq_type);
 214         sni_hwint = a20r_hwint;
 215         change_c0_status(ST0_IM, IE_IRQ0);
 216         setup_irq (SNI_A20R_IRQ_BASE + 3, &sni_isa_irq);
 217 }
 218
 219 void sni_a20r_init(void)
 220 {
 221         /* FIXME, remove if not needed */
 222 }
 223
 224 static int __init snirm_a20r_setup_devinit(void)
 225 {
 226         switch (sni_brd_type) {
 227         case SNI_BRD_TOWER_OASIC:
 228         case SNI_BRD_MINITOWER:
 229                 platform_device_register(&snirm_82596_pdev);
 230                 platform_device_register(&snirm_53c710_pdev);
 231                 platform_device_register(&sc26xx_pdev);
 232                 platform_device_register(&a20r_serial8250_device);
 233                 platform_device_register(&a20r_ds1216_device);
 234                 break;
 235         }
 236
 237         return 0;
 238 }
 239
 240 device_initcall(snirm_a20r_setup_devinit);