arch/mips/sni/rm200.c

   1 /*
   2  * RM200 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 #include <asm/irq_cpu.h>
  19
  20 #define PORT(_base,_irq)                                \
  21         {                                               \
  22                 .iobase         = _base,                \
  23                 .irq            = _irq,                 \
  24                 .uartclk        = 1843200,              \
  25                 .iotype         = UPIO_PORT,            \
  26                 .flags          = UPF_BOOT_AUTOCONF,    \
  27         }
  28
  29 static struct plat_serial8250_port rm200_data[] = {
  30         PORT(0x3f8, 4),
  31         PORT(0x2f8, 3),
  32         { },
  33 };
  34
  35 static struct platform_device rm200_serial8250_device = {
  36         .name                   = "serial8250",
  37         .id                     = PLAT8250_DEV_PLATFORM,
  38         .dev                    = {
  39                 .platform_data  = rm200_data,
  40         },
  41 };
  42
  43 static struct resource rm200_ds1216_rsrc[] = {
  44         {
  45                 .start = 0x1cd41ffc,
  46                 .end   = 0x1cd41fff,
  47                 .flags = IORESOURCE_MEM
  48         }
  49 };
  50
  51 static struct platform_device rm200_ds1216_device = {
  52         .name           = "rtc-ds1216",
  53         .num_resources  = ARRAY_SIZE(rm200_ds1216_rsrc),
  54         .resource       = rm200_ds1216_rsrc
  55 };
  56
  57 static struct resource snirm_82596_rm200_rsrc[] = {
  58         {
  59                 .start = 0x18000000,
  60                 .end   = 0x180fffff,
  61                 .flags = IORESOURCE_MEM
  62         },
  63         {
  64                 .start = 0x1b000000,
  65                 .end   = 0x1b000004,
  66                 .flags = IORESOURCE_MEM
  67         },
  68         {
  69                 .start = 0x1ff00000,
  70                 .end   = 0x1ff00020,
  71                 .flags = IORESOURCE_MEM
  72         },
  73         {
  74                 .start = 27,
  75                 .end   = 27,
  76                 .flags = IORESOURCE_IRQ
  77         },
  78         {
  79                 .flags = 0x00
  80         }
  81 };
  82
  83 static struct platform_device snirm_82596_rm200_pdev = {
  84         .name           = "snirm_82596",
  85         .num_resources  = ARRAY_SIZE(snirm_82596_rm200_rsrc),
  86         .resource       = snirm_82596_rm200_rsrc
  87 };
  88
  89 static struct resource snirm_53c710_rm200_rsrc[] = {
  90         {
  91                 .start = 0x19000000,
  92                 .end   = 0x190fffff,
  93                 .flags = IORESOURCE_MEM
  94         },
  95         {
  96                 .start = 26,
  97                 .end   = 26,
  98                 .flags = IORESOURCE_IRQ
  99         }
 100 };
 101
 102 static struct platform_device snirm_53c710_rm200_pdev = {
 103         .name           = "snirm_53c710",
 104         .num_resources  = ARRAY_SIZE(snirm_53c710_rm200_rsrc),
 105         .resource       = snirm_53c710_rm200_rsrc
 106 };
 107
 108 static int __init snirm_setup_devinit(void)
 109 {
 110         if (sni_brd_type == SNI_BRD_RM200) {
 111                 platform_device_register(&rm200_serial8250_device);
 112                 platform_device_register(&rm200_ds1216_device);
 113                 platform_device_register(&snirm_82596_rm200_pdev);
 114                 platform_device_register(&snirm_53c710_rm200_pdev);
 115         }
 116         return 0;
 117 }
 118
 119 device_initcall(snirm_setup_devinit);
 120
 121
 122 #define SNI_RM200_INT_STAT_REG  0xbc000000
 123 #define SNI_RM200_INT_ENA_REG   0xbc080000
 124
 125 #define SNI_RM200_INT_START  24
 126 #define SNI_RM200_INT_END    28
 127
 128 static void enable_rm200_irq(unsigned int irq)
 129 {
 130         unsigned int mask = 1 << (irq - SNI_RM200_INT_START);
 131
 132         *(volatile u8 *)SNI_RM200_INT_ENA_REG &= ~mask;
 133 }
 134
 135 void disable_rm200_irq(unsigned int irq)
 136 {
 137         unsigned int mask = 1 << (irq - SNI_RM200_INT_START);
 138
 139         *(volatile u8 *)SNI_RM200_INT_ENA_REG |= mask;
 140 }
 141
 142 void end_rm200_irq(unsigned int irq)
 143 {
 144         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 145                 enable_rm200_irq(irq);
 146 }
 147
 148 static struct irq_chip rm200_irq_type = {
 149         .typename = "RM200",
 150         .ack = disable_rm200_irq,
 151         .mask = disable_rm200_irq,
 152         .mask_ack = disable_rm200_irq,
 153         .unmask = enable_rm200_irq,
 154         .end = end_rm200_irq,
 155 };
 156
 157 static void sni_rm200_hwint(void)
 158 {
 159         u32 pending = read_c0_cause() & read_c0_status();
 160         u8 mask;
 161         u8 stat;
 162         int irq;
 163
 164         if (pending & C_IRQ5)
 165                 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
 166         else if (pending & C_IRQ0) {
 167                 clear_c0_status(IE_IRQ0);
 168                 mask = *(volatile u8 *)SNI_RM200_INT_ENA_REG ^ 0x1f;
 169                 stat = *(volatile u8 *)SNI_RM200_INT_STAT_REG ^ 0x14;
 170                 irq = ffs(stat & mask & 0x1f);
 171
 172                 if (likely(irq > 0))
 173                         do_IRQ(irq + SNI_RM200_INT_START - 1);
 174                 set_c0_status(IE_IRQ0);
 175         }
 176 }
 177
 178 void __init sni_rm200_irq_init(void)
 179 {
 180         int i;
 181
 182         * (volatile u8 *)SNI_RM200_INT_ENA_REG = 0x1f;
 183
 184         mips_cpu_irq_init();
 185         /* Actually we've got more interrupts to handle ...  */
 186         for (i = SNI_RM200_INT_START; i <= SNI_RM200_INT_END; i++)
 187                 set_irq_chip(i, &rm200_irq_type);
 188         sni_hwint = sni_rm200_hwint;
 189         change_c0_status(ST0_IM, IE_IRQ0);
 190         setup_irq(SNI_RM200_INT_START + 0, &sni_isa_irq);
 191 }
 192
 193 void __init sni_rm200_init(void)
 194 {
 195         set_io_port_base(SNI_PORT_BASE + 0x02000000);
 196         ioport_resource.end += 0x02000000;
 197 }