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 unsigned int sc26xx_data[2] = {
 121         /* DTR   |   RTS    |   DSR    |   CTS     |   DCD     |   RI    */
 122         (8 << 0) | (4 << 4) | (6 << 8) | (0 << 12) | (6 << 16) | (0 << 20),
 123         (3 << 0) | (2 << 4) | (1 << 8) | (2 << 12) | (3 << 16) | (4 << 20)
 124 };
 125
 126 static struct platform_device sc26xx_pdev = {
 127         .name           = "SC26xx",
 128         .num_resources  = ARRAY_SIZE(sc26xx_rsrc),
 129         .resource       = sc26xx_rsrc,
 130         .dev                    = {
 131                 .platform_data  = sc26xx_data,
 132         }
 133 };
 134
 135 static u32 a20r_ack_hwint(void)
 136 {
 137         u32 status = read_c0_status();
 138
 139         write_c0_status(status | 0x00010000);
 140         asm volatile(
 141         "       .set    push                    \n"
 142         "       .set    noat                    \n"
 143         "       .set    noreorder               \n"
 144         "       lw      $1, 0(%0)               \n"
 145         "       sb      $0, 0(%1)               \n"
 146         "       sync                            \n"
 147         "       lb      %1, 0(%1)               \n"
 148         "       b       1f                      \n"
 149         "       ori     %1, $1, 2               \n"
 150         "       .align  8                       \n"
 151         "1:                                     \n"
 152         "       nop                             \n"
 153         "       sw      %1, 0(%0)               \n"
 154         "       sync                            \n"
 155         "       li      %1, 0x20                \n"
 156         "2:                                     \n"
 157         "       nop                             \n"
 158         "       bnez    %1,2b                   \n"
 159         "       addiu   %1, -1                  \n"
 160         "       sw      $1, 0(%0)               \n"
 161         "       sync                            \n"
 162                 ".set   pop                     \n"
 163         :
 164         : "Jr" (PCIMT_UCONF), "Jr" (0xbc000000));
 165         write_c0_status(status);
 166
 167         return status;
 168 }
 169
 170 static inline void unmask_a20r_irq(unsigned int irq)
 171 {
 172         set_c0_status(0x100 << (irq - SNI_A20R_IRQ_BASE));
 173         irq_enable_hazard();
 174 }
 175
 176 static inline void mask_a20r_irq(unsigned int irq)
 177 {
 178         clear_c0_status(0x100 << (irq - SNI_A20R_IRQ_BASE));
 179         irq_disable_hazard();
 180 }
 181
 182 static void end_a20r_irq(unsigned int irq)
 183 {
 184         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
 185                 a20r_ack_hwint();
 186                 unmask_a20r_irq(irq);
 187         }
 188 }
 189
 190 static struct irq_chip a20r_irq_type = {
 191         .typename       = "A20R",
 192         .ack            = mask_a20r_irq,
 193         .mask           = mask_a20r_irq,
 194         .mask_ack       = mask_a20r_irq,
 195         .unmask         = unmask_a20r_irq,
 196         .end            = end_a20r_irq,
 197 };
 198
 199 /*
 200  * hwint 0 receive all interrupts
 201  */
 202 static void a20r_hwint(void)
 203 {
 204         u32 cause, status;
 205         int irq;
 206
 207         clear_c0_status(IE_IRQ0);
 208         status = a20r_ack_hwint();
 209         cause = read_c0_cause();
 210
 211         irq = ffs(((cause & status) >> 8) & 0xf8);
 212         if (likely(irq > 0))
 213                 do_IRQ(SNI_A20R_IRQ_BASE + irq - 1);
 214         set_c0_status(IE_IRQ0);
 215 }
 216
 217 void __init sni_a20r_irq_init(void)
 218 {
 219         int i;
 220
 221         for (i = SNI_A20R_IRQ_BASE + 2 ; i < SNI_A20R_IRQ_BASE + 8; i++)
 222                 set_irq_chip(i, &a20r_irq_type);
 223         sni_hwint = a20r_hwint;
 224         change_c0_status(ST0_IM, IE_IRQ0);
 225         setup_irq(SNI_A20R_IRQ_BASE + 3, &sni_isa_irq);
 226 }
 227
 228 void sni_a20r_init(void)
 229 {
 230         /* FIXME, remove if not needed */
 231 }
 232
 233 static int __init snirm_a20r_setup_devinit(void)
 234 {
 235         switch (sni_brd_type) {
 236         case SNI_BRD_TOWER_OASIC:
 237         case SNI_BRD_MINITOWER:
 238                 platform_device_register(&snirm_82596_pdev);
 239                 platform_device_register(&snirm_53c710_pdev);
 240                 platform_device_register(&sc26xx_pdev);
 241                 platform_device_register(&a20r_serial8250_device);
 242                 platform_device_register(&a20r_ds1216_device);
 243                 sni_eisa_root_init();
 244                 break;
 245         }
 246         return 0;
 247 }
 248
 249 device_initcall(snirm_a20r_setup_devinit);