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/ds1216.h>
  19 #include <asm/irq_cpu.h>
  20
  21 #define PORT(_base,_irq)                                \
  22         {                                               \
  23                 .iobase         = _base,                \
  24                 .irq            = _irq,                 \
  25                 .uartclk        = 1843200,              \
  26                 .iotype         = UPIO_PORT,            \
  27                 .flags          = UPF_BOOT_AUTOCONF,    \
  28         }
  29
  30 static struct plat_serial8250_port rm200_data[] = {
  31         PORT(0x3f8, 4),
  32         PORT(0x2f8, 3),
  33         { },
  34 };
  35
  36 static struct platform_device rm200_serial8250_device = {
  37         .name                   = "serial8250",
  38         .id                     = PLAT8250_DEV_PLATFORM,
  39         .dev                    = {
  40                 .platform_data  = rm200_data,
  41         },
  42 };
  43
  44 static struct resource snirm_82596_rm200_rsrc[] = {
  45         {
  46                 .start = 0xb8000000,
  47                 .end   = 0xb80fffff,
  48                 .flags = IORESOURCE_MEM
  49         },
  50         {
  51                 .start = 0xbb000000,
  52                 .end   = 0xbb000004,
  53                 .flags = IORESOURCE_MEM
  54         },
  55         {
  56                 .start = 0xbff00000,
  57                 .end   = 0xbff00020,
  58                 .flags = IORESOURCE_MEM
  59         },
  60         {
  61                 .start = 27,
  62                 .end   = 27,
  63                 .flags = IORESOURCE_IRQ
  64         },
  65         {
  66                 .flags = 0x00
  67         }
  68 };
  69
  70 static struct platform_device snirm_82596_rm200_pdev = {
  71         .name           = "snirm_82596",
  72         .num_resources  = ARRAY_SIZE(snirm_82596_rm200_rsrc),
  73         .resource       = snirm_82596_rm200_rsrc
  74 };
  75
  76 static struct resource snirm_53c710_rm200_rsrc[] = {
  77         {
  78                 .start = 0xb9000000,
  79                 .end   = 0xb90fffff,
  80                 .flags = IORESOURCE_MEM
  81         },
  82         {
  83                 .start = 26,
  84                 .end   = 26,
  85                 .flags = IORESOURCE_IRQ
  86         }
  87 };
  88
  89 static struct platform_device snirm_53c710_rm200_pdev = {
  90         .name           = "snirm_53c710",
  91         .num_resources  = ARRAY_SIZE(snirm_53c710_rm200_rsrc),
  92         .resource       = snirm_53c710_rm200_rsrc
  93 };
  94
  95 static int __init snirm_setup_devinit(void)
  96 {
  97         if (sni_brd_type == SNI_BRD_RM200) {
  98                 platform_device_register(&rm200_serial8250_device);
  99                 platform_device_register(&snirm_82596_rm200_pdev);
 100                 platform_device_register(&snirm_53c710_rm200_pdev);
 101         }
 102         return 0;
 103 }
 104
 105 device_initcall(snirm_setup_devinit);
 106
 107
 108 #define SNI_RM200_INT_STAT_REG  0xbc000000
 109 #define SNI_RM200_INT_ENA_REG   0xbc080000
 110
 111 #define SNI_RM200_INT_START  24
 112 #define SNI_RM200_INT_END    28
 113
 114 static void enable_rm200_irq(unsigned int irq)
 115 {
 116         unsigned int mask = 1 << (irq - SNI_RM200_INT_START);
 117
 118         *(volatile u8 *)SNI_RM200_INT_ENA_REG &= ~mask;
 119 }
 120
 121 void disable_rm200_irq(unsigned int irq)
 122 {
 123         unsigned int mask = 1 << (irq - SNI_RM200_INT_START);
 124
 125         *(volatile u8 *)SNI_RM200_INT_ENA_REG |= mask;
 126 }
 127
 128 void end_rm200_irq(unsigned int irq)
 129 {
 130         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 131                 enable_rm200_irq(irq);
 132 }
 133
 134 static struct irq_chip rm200_irq_type = {
 135         .typename = "RM200",
 136         .ack = disable_rm200_irq,
 137         .mask = disable_rm200_irq,
 138         .mask_ack = disable_rm200_irq,
 139         .unmask = enable_rm200_irq,
 140         .end = end_rm200_irq,
 141 };
 142
 143 static void sni_rm200_hwint(void)
 144 {
 145         u32 pending = read_c0_cause() & read_c0_status();
 146         u8 mask;
 147         u8 stat;
 148         int irq;
 149
 150         if (pending & C_IRQ5)
 151                 do_IRQ (SNI_MIPS_IRQ_CPU_BASE + 7);
 152         else if (pending & C_IRQ0) {
 153                 clear_c0_status (IE_IRQ0);
 154                 mask = *(volatile u8 *)SNI_RM200_INT_ENA_REG ^ 0x1f;
 155                 stat = *(volatile u8 *)SNI_RM200_INT_STAT_REG ^ 0x14;
 156                 irq = ffs(stat & mask & 0x1f);
 157
 158                 if (likely(irq > 0))
 159                         do_IRQ (irq + SNI_RM200_INT_START - 1);
 160                 set_c0_status (IE_IRQ0);
 161         }
 162 }
 163
 164 void __init sni_rm200_irq_init(void)
 165 {
 166         int i;
 167
 168         * (volatile u8 *)SNI_RM200_INT_ENA_REG = 0x1f;
 169
 170         mips_cpu_irq_init();
 171         /* Actually we've got more interrupts to handle ...  */
 172         for (i = SNI_RM200_INT_START; i <= SNI_RM200_INT_END; i++)
 173                 set_irq_chip(i, &rm200_irq_type);
 174         sni_hwint = sni_rm200_hwint;
 175         change_c0_status(ST0_IM, IE_IRQ0);
 176         setup_irq (SNI_RM200_INT_START + 0, &sni_isa_irq);
 177 }
 178
 179 void sni_rm200_init(void)
 180 {
 181         set_io_port_base(SNI_PORT_BASE + 0x02000000);
 182         ioport_resource.end += 0x02000000;
 183         ds1216_base = (volatile unsigned char *) SNI_DS1216_RM200_BASE;
 184         rtc_mips_get_time = ds1216_get_cmos_time;
 185         board_time_init = sni_cpu_time_init;
 186 }