arch/mips/sni/pcit.c

   1 /*
   2  * PCI Tower 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/irq.h>
  14 #include <linux/pci.h>
  15 #include <linux/serial_8250.h>
  16
  17 #include <asm/sni.h>
  18 #include <asm/time.h>
  19 #include <asm/irq_cpu.h>
  20
  21
  22 #define PORT(_base,_irq)                                \
  23         {                                               \
  24                 .iobase         = _base,                \
  25                 .irq            = _irq,                 \
  26                 .uartclk        = 1843200,              \
  27                 .iotype         = UPIO_PORT,            \
  28                 .flags          = UPF_BOOT_AUTOCONF,    \
  29         }
  30
  31 static struct plat_serial8250_port pcit_data[] = {
  32         PORT(0x3f8, 0),
  33         PORT(0x2f8, 3),
  34         { },
  35 };
  36
  37 static struct platform_device pcit_serial8250_device = {
  38         .name                   = "serial8250",
  39         .id                     = PLAT8250_DEV_PLATFORM,
  40         .dev                    = {
  41                 .platform_data  = pcit_data,
  42         },
  43 };
  44
  45 static struct plat_serial8250_port pcit_cplus_data[] = {
  46         PORT(0x3f8, 0),
  47         PORT(0x2f8, 3),
  48         PORT(0x3e8, 4),
  49         PORT(0x2e8, 3),
  50         { },
  51 };
  52
  53 static struct platform_device pcit_cplus_serial8250_device = {
  54         .name                   = "serial8250",
  55         .id                     = PLAT8250_DEV_PLATFORM,
  56         .dev                    = {
  57                 .platform_data  = pcit_cplus_data,
  58         },
  59 };
  60
  61 static struct resource pcit_cmos_rsrc[] = {
  62         {
  63                 .start = 0x70,
  64                 .end   = 0x71,
  65                 .flags = IORESOURCE_IO
  66         },
  67         {
  68                 .start = 8,
  69                 .end   = 8,
  70                 .flags = IORESOURCE_IRQ
  71         }
  72 };
  73
  74 static struct platform_device pcit_cmos_device = {
  75         .name           = "rtc_cmos",
  76         .num_resources  = ARRAY_SIZE(pcit_cmos_rsrc),
  77         .resource       = pcit_cmos_rsrc
  78 };
  79
  80 static struct platform_device pcit_pcspeaker_pdev = {
  81         .name           = "pcspkr",
  82         .id             = -1,
  83 };
  84
  85 static struct resource sni_io_resource = {
  86         .start  = 0x00000000UL,
  87         .end    = 0x03bfffffUL,
  88         .name   = "PCIT IO",
  89         .flags  = IORESOURCE_IO,
  90 };
  91
  92 static struct resource pcit_io_resources[] = {
  93         {
  94                 .start  = 0x00,
  95                 .end    = 0x1f,
  96                 .name   = "dma1",
  97                 .flags  = IORESOURCE_BUSY
  98         }, {
  99                 .start  =  0x40,
 100                 .end    = 0x5f,
 101                 .name   = "timer",
 102                 .flags  = IORESOURCE_BUSY
 103         }, {
 104                 .start  =  0x60,
 105                 .end    = 0x6f,
 106                 .name   = "keyboard",
 107                 .flags  = IORESOURCE_BUSY
 108         }, {
 109                 .start  =  0x80,
 110                 .end    = 0x8f,
 111                 .name   = "dma page reg",
 112                 .flags  = IORESOURCE_BUSY
 113         }, {
 114                 .start  =  0xc0,
 115                 .end    = 0xdf,
 116                 .name   = "dma2",
 117                 .flags  = IORESOURCE_BUSY
 118         }, {
 119                 .start  =  0xcf8,
 120                 .end    = 0xcfb,
 121                 .name   = "PCI config addr",
 122                 .flags  = IORESOURCE_BUSY
 123         }, {
 124                 .start  =  0xcfc,
 125                 .end    = 0xcff,
 126                 .name   = "PCI config data",
 127                 .flags  = IORESOURCE_BUSY
 128         }
 129 };
 130
 131 static void __init sni_pcit_resource_init(void)
 132 {
 133         int i;
 134
 135         /* request I/O space for devices used on all i[345]86 PCs */
 136         for (i = 0; i < ARRAY_SIZE(pcit_io_resources); i++)
 137                 request_resource(&sni_io_resource, pcit_io_resources + i);
 138 }
 139
 140
 141 extern struct pci_ops sni_pcit_ops;
 142
 143 #ifdef CONFIG_PCI
 144 static struct resource sni_mem_resource = {
 145         .start  = 0x18000000UL,
 146         .end    = 0x1fbfffffUL,
 147         .name   = "PCIT PCI MEM",
 148         .flags  = IORESOURCE_MEM
 149 };
 150
 151 static struct pci_controller sni_pcit_controller = {
 152         .pci_ops        = &sni_pcit_ops,
 153         .mem_resource   = &sni_mem_resource,
 154         .mem_offset     = 0x00000000UL,
 155         .io_resource    = &sni_io_resource,
 156         .io_offset      = 0x00000000UL,
 157         .io_map_base    = SNI_PORT_BASE
 158 };
 159 #endif /* CONFIG_PCI */
 160
 161 static void enable_pcit_irq(struct irq_data *d)
 162 {
 163         u32 mask = 1 << (d->irq - SNI_PCIT_INT_START + 24);
 164
 165         *(volatile u32 *)SNI_PCIT_INT_REG |= mask;
 166 }
 167
 168 void disable_pcit_irq(struct irq_data *d)
 169 {
 170         u32 mask = 1 << (d->irq - SNI_PCIT_INT_START + 24);
 171
 172         *(volatile u32 *)SNI_PCIT_INT_REG &= ~mask;
 173 }
 174
 175 static struct irq_chip pcit_irq_type = {
 176         .name = "PCIT",
 177         .irq_mask = disable_pcit_irq,
 178         .irq_unmask = enable_pcit_irq,
 179 };
 180
 181 static void pcit_hwint1(void)
 182 {
 183         u32 pending = *(volatile u32 *)SNI_PCIT_INT_REG;
 184         int irq;
 185
 186         clear_c0_status(IE_IRQ1);
 187         irq = ffs((pending >> 16) & 0x7f);
 188
 189         if (likely(irq > 0))
 190                 do_IRQ(irq + SNI_PCIT_INT_START - 1);
 191         set_c0_status(IE_IRQ1);
 192 }
 193
 194 static void pcit_hwint0(void)
 195 {
 196         u32 pending = *(volatile u32 *)SNI_PCIT_INT_REG;
 197         int irq;
 198
 199         clear_c0_status(IE_IRQ0);
 200         irq = ffs((pending >> 16) & 0x3f);
 201
 202         if (likely(irq > 0))
 203                 do_IRQ(irq + SNI_PCIT_INT_START - 1);
 204         set_c0_status(IE_IRQ0);
 205 }
 206
 207 static void sni_pcit_hwint(void)
 208 {
 209         u32 pending = read_c0_cause() & read_c0_status();
 210
 211         if (pending & C_IRQ1)
 212                 pcit_hwint1();
 213         else if (pending & C_IRQ2)
 214                 do_IRQ(MIPS_CPU_IRQ_BASE + 4);
 215         else if (pending & C_IRQ3)
 216                 do_IRQ(MIPS_CPU_IRQ_BASE + 5);
 217         else if (pending & C_IRQ5)
 218                 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
 219 }
 220
 221 static void sni_pcit_hwint_cplus(void)
 222 {
 223         u32 pending = read_c0_cause() & read_c0_status();
 224
 225         if (pending & C_IRQ0)
 226                 pcit_hwint0();
 227         else if (pending & C_IRQ1)
 228                 do_IRQ(MIPS_CPU_IRQ_BASE + 3);
 229         else if (pending & C_IRQ2)
 230                 do_IRQ(MIPS_CPU_IRQ_BASE + 4);
 231         else if (pending & C_IRQ3)
 232                 do_IRQ(MIPS_CPU_IRQ_BASE + 5);
 233         else if (pending & C_IRQ5)
 234                 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
 235 }
 236
 237 void __init sni_pcit_irq_init(void)
 238 {
 239         int i;
 240
 241         mips_cpu_irq_init();
 242         for (i = SNI_PCIT_INT_START; i <= SNI_PCIT_INT_END; i++)
 243                 irq_set_chip_and_handler(i, &pcit_irq_type, handle_level_irq);
 244         *(volatile u32 *)SNI_PCIT_INT_REG = 0;
 245         sni_hwint = sni_pcit_hwint;
 246         change_c0_status(ST0_IM, IE_IRQ1);
 247         if (request_irq(SNI_PCIT_INT_START + 6, sni_isa_irq_handler, 0, "ISA",
 248                         NULL))
 249                 pr_err("Failed to register ISA interrupt\n");
 250 }
 251
 252 void __init sni_pcit_cplus_irq_init(void)
 253 {
 254         int i;
 255
 256         mips_cpu_irq_init();
 257         for (i = SNI_PCIT_INT_START; i <= SNI_PCIT_INT_END; i++)
 258                 irq_set_chip_and_handler(i, &pcit_irq_type, handle_level_irq);
 259         *(volatile u32 *)SNI_PCIT_INT_REG = 0x40000000;
 260         sni_hwint = sni_pcit_hwint_cplus;
 261         change_c0_status(ST0_IM, IE_IRQ0);
 262         if (request_irq(MIPS_CPU_IRQ_BASE + 3, sni_isa_irq_handler, 0, "ISA",
 263                         NULL))
 264                 pr_err("Failed to register ISA interrupt\n");
 265 }
 266
 267 void __init sni_pcit_init(void)
 268 {
 269         ioport_resource.end = sni_io_resource.end;
 270 #ifdef CONFIG_PCI
 271         PCIBIOS_MIN_IO = 0x9000;
 272         register_pci_controller(&sni_pcit_controller);
 273 #endif
 274         sni_pcit_resource_init();
 275 }
 276
 277 static int __init snirm_pcit_setup_devinit(void)
 278 {
 279         switch (sni_brd_type) {
 280         case SNI_BRD_PCI_TOWER:
 281                 platform_device_register(&pcit_serial8250_device);
 282                 platform_device_register(&pcit_cmos_device);
 283                 platform_device_register(&pcit_pcspeaker_pdev);
 284                 break;
 285
 286         case SNI_BRD_PCI_TOWER_CPLUS:
 287                 platform_device_register(&pcit_cplus_serial8250_device);
 288                 platform_device_register(&pcit_cmos_device);
 289                 platform_device_register(&pcit_pcspeaker_pdev);
 290                 break;
 291         }
 292         return 0;
 293 }
 294
 295 device_initcall(snirm_pcit_setup_devinit);