arch/mips/sni/pcimt.c

   1 /*
   2  * PCIMT 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) 1996, 97, 98, 2000, 03, 04, 06 Ralf Baechle (ralf@linux-mips.org)
   9  * Copyright (C) 2006,2007 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/interrupt.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/i8259.h>
  20 #include <asm/irq_cpu.h>
  21
  22 #define cacheconf (*(volatile unsigned int *)PCIMT_CACHECONF)
  23 #define invspace (*(volatile unsigned int *)PCIMT_INVSPACE)
  24
  25 static void __init sni_pcimt_sc_init(void)
  26 {
  27         unsigned int scsiz, sc_size;
  28
  29         scsiz = cacheconf & 7;
  30         if (scsiz == 0) {
  31                 printk("Second level cache is deactived.\n");
  32                 return;
  33         }
  34         if (scsiz >= 6) {
  35                 printk("Invalid second level cache size configured, "
  36                        "deactivating second level cache.\n");
  37                 cacheconf = 0;
  38                 return;
  39         }
  40
  41         sc_size = 128 << scsiz;
  42         printk("%dkb second level cache detected, deactivating.\n", sc_size);
  43         cacheconf = 0;
  44 }
  45
  46
  47 /*
  48  * A bit more gossip about the iron we're running on ...
  49  */
  50 static inline void sni_pcimt_detect(void)
  51 {
  52         char boardtype[80];
  53         unsigned char csmsr;
  54         char *p = boardtype;
  55         unsigned int asic;
  56
  57         csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
  58
  59         p += sprintf(p, "%s PCI", (csmsr & 0x80) ? "RM200" : "RM300");
  60         if ((csmsr & 0x80) == 0)
  61                 p += sprintf(p, ", board revision %s",
  62                              (csmsr & 0x20) ? "D" : "C");
  63         asic = csmsr & 0x80;
  64         asic = (csmsr & 0x08) ? asic : !asic;
  65         p += sprintf(p, ", ASIC PCI Rev %s", asic ? "1.0" : "1.1");
  66         printk("%s.\n", boardtype);
  67 }
  68
  69 #define PORT(_base,_irq)                                \
  70         {                                               \
  71                 .iobase         = _base,                \
  72                 .irq            = _irq,                 \
  73                 .uartclk        = 1843200,              \
  74                 .iotype         = UPIO_PORT,            \
  75                 .flags          = UPF_BOOT_AUTOCONF,    \
  76         }
  77
  78 static struct plat_serial8250_port pcimt_data[] = {
  79         PORT(0x3f8, 4),
  80         PORT(0x2f8, 3),
  81         { },
  82 };
  83
  84 static struct platform_device pcimt_serial8250_device = {
  85         .name                   = "serial8250",
  86         .id                     = PLAT8250_DEV_PLATFORM,
  87         .dev                    = {
  88                 .platform_data  = pcimt_data,
  89         },
  90 };
  91
  92 static struct resource pcimt_cmos_rsrc[] = {
  93         {
  94                 .start = 0x70,
  95                 .end   = 0x71,
  96                 .flags = IORESOURCE_IO
  97         },
  98         {
  99                 .start = 8,
 100                 .end   = 8,
 101                 .flags = IORESOURCE_IRQ
 102         }
 103 };
 104
 105 static struct platform_device pcimt_cmos_device = {
 106         .name           = "rtc_cmos",
 107         .num_resources  = ARRAY_SIZE(pcimt_cmos_rsrc),
 108         .resource       = pcimt_cmos_rsrc
 109 };
 110
 111
 112 static struct resource sni_io_resource = {
 113         .start  = 0x00000000UL,
 114         .end    = 0x03bfffffUL,
 115         .name   = "PCIMT IO MEM",
 116         .flags  = IORESOURCE_IO,
 117 };
 118
 119 static struct resource pcimt_io_resources[] = {
 120         {
 121                 .start  = 0x00,
 122                 .end    = 0x1f,
 123                 .name   = "dma1",
 124                 .flags  = IORESOURCE_BUSY
 125         }, {
 126                 .start  =  0x40,
 127                 .end    = 0x5f,
 128                 .name   = "timer",
 129                 .flags  = IORESOURCE_BUSY
 130         }, {
 131                 .start  =  0x60,
 132                 .end    = 0x6f,
 133                 .name   = "keyboard",
 134                 .flags  = IORESOURCE_BUSY
 135         }, {
 136                 .start  =  0x80,
 137                 .end    = 0x8f,
 138                 .name   = "dma page reg",
 139                 .flags  = IORESOURCE_BUSY
 140         }, {
 141                 .start  =  0xc0,
 142                 .end    = 0xdf,
 143                 .name   = "dma2",
 144                 .flags  = IORESOURCE_BUSY
 145         }, {
 146                 .start  =  0xcfc,
 147                 .end    = 0xcff,
 148                 .name   = "PCI config data",
 149                 .flags  = IORESOURCE_BUSY
 150         }
 151 };
 152
 153 static struct resource pcimt_mem_resources[] = {
 154         {
 155                 /*
 156                  * this region should only be 4 bytes long,
 157                  * but it's 16MB on all RM300C I've checked
 158                  */
 159                 .start  = 0x1a000000,
 160                 .end    = 0x1affffff,
 161                 .name   = "PCI INT ACK",
 162                 .flags  = IORESOURCE_BUSY
 163         }
 164 };
 165
 166 static struct resource sni_mem_resource = {
 167         .start  = 0x18000000UL,
 168         .end    = 0x1fbfffffUL,
 169         .name   = "PCIMT PCI MEM",
 170         .flags  = IORESOURCE_MEM
 171 };
 172
 173 static void __init sni_pcimt_resource_init(void)
 174 {
 175         int i;
 176
 177         /* request I/O space for devices used on all i[345]86 PCs */
 178         for (i = 0; i < ARRAY_SIZE(pcimt_io_resources); i++)
 179                 request_resource(&sni_io_resource, pcimt_io_resources + i);
 180         /* request MEM space for devices used on all i[345]86 PCs */
 181         for (i = 0; i < ARRAY_SIZE(pcimt_mem_resources); i++)
 182                 request_resource(&sni_mem_resource, pcimt_mem_resources + i);
 183 }
 184
 185 extern struct pci_ops sni_pcimt_ops;
 186
 187 static struct pci_controller sni_controller = {
 188         .pci_ops        = &sni_pcimt_ops,
 189         .mem_resource   = &sni_mem_resource,
 190         .mem_offset     = 0x00000000UL,
 191         .io_resource    = &sni_io_resource,
 192         .io_offset      = 0x00000000UL,
 193         .io_map_base    = SNI_PORT_BASE
 194 };
 195
 196 static void enable_pcimt_irq(unsigned int irq)
 197 {
 198         unsigned int mask = 1 << (irq - PCIMT_IRQ_INT2);
 199
 200         *(volatile u8 *) PCIMT_IRQSEL |= mask;
 201 }
 202
 203 void disable_pcimt_irq(unsigned int irq)
 204 {
 205         unsigned int mask = ~(1 << (irq - PCIMT_IRQ_INT2));
 206
 207         *(volatile u8 *) PCIMT_IRQSEL &= mask;
 208 }
 209
 210 static void end_pcimt_irq(unsigned int irq)
 211 {
 212         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 213                 enable_pcimt_irq(irq);
 214 }
 215
 216 static struct irq_chip pcimt_irq_type = {
 217         .typename = "PCIMT",
 218         .ack = disable_pcimt_irq,
 219         .mask = disable_pcimt_irq,
 220         .mask_ack = disable_pcimt_irq,
 221         .unmask = enable_pcimt_irq,
 222         .end = end_pcimt_irq,
 223 };
 224
 225 /*
 226  * hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug
 227  * button interrupts.  Later ...
 228  */
 229 static void pcimt_hwint0(void)
 230 {
 231         panic("Received int0 but no handler yet ...");
 232 }
 233
 234 /*
 235  * hwint 1 deals with EISA and SCSI interrupts,
 236  *
 237  * The EISA_INT bit in CSITPEND is high active, all others are low active.
 238  */
 239 static void pcimt_hwint1(void)
 240 {
 241         u8 pend = *(volatile char *)PCIMT_CSITPEND;
 242         unsigned long flags;
 243
 244         if (pend & IT_EISA) {
 245                 int irq;
 246                 /*
 247                  * Note: ASIC PCI's builtin interrupt acknowledge feature is
 248                  * broken.  Using it may result in loss of some or all i8259
 249                  * interrupts, so don't use PCIMT_INT_ACKNOWLEDGE ...
 250                  */
 251                 irq = i8259_irq();
 252                 if (unlikely(irq < 0))
 253                         return;
 254
 255                 do_IRQ(irq);
 256         }
 257
 258         if (!(pend & IT_SCSI)) {
 259                 flags = read_c0_status();
 260                 clear_c0_status(ST0_IM);
 261                 do_IRQ(PCIMT_IRQ_SCSI);
 262                 write_c0_status(flags);
 263         }
 264 }
 265
 266 /*
 267  * hwint 3 should deal with the PCI A - D interrupts,
 268  */
 269 static void pcimt_hwint3(void)
 270 {
 271         u8 pend = *(volatile char *)PCIMT_CSITPEND;
 272         int irq;
 273
 274         pend &= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
 275         pend ^= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
 276         clear_c0_status(IE_IRQ3);
 277         irq = PCIMT_IRQ_INT2 + ffs(pend) - 1;
 278         do_IRQ(irq);
 279         set_c0_status(IE_IRQ3);
 280 }
 281
 282 static void sni_pcimt_hwint(void)
 283 {
 284         u32 pending = read_c0_cause() & read_c0_status();
 285
 286         if (pending & C_IRQ5)
 287                 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
 288         else if (pending & C_IRQ4)
 289                 do_IRQ(MIPS_CPU_IRQ_BASE + 6);
 290         else if (pending & C_IRQ3)
 291                 pcimt_hwint3();
 292         else if (pending & C_IRQ1)
 293                 pcimt_hwint1();
 294         else if (pending & C_IRQ0) {
 295                 pcimt_hwint0();
 296         }
 297 }
 298
 299 void __init sni_pcimt_irq_init(void)
 300 {
 301         int i;
 302
 303         *(volatile u8 *) PCIMT_IRQSEL = IT_ETH | IT_EISA;
 304         mips_cpu_irq_init();
 305         /* Actually we've got more interrupts to handle ...  */
 306         for (i = PCIMT_IRQ_INT2; i <= PCIMT_IRQ_SCSI; i++)
 307                 set_irq_chip(i, &pcimt_irq_type);
 308         sni_hwint = sni_pcimt_hwint;
 309         change_c0_status(ST0_IM, IE_IRQ1|IE_IRQ3);
 310 }
 311
 312 void __init sni_pcimt_init(void)
 313 {
 314         sni_pcimt_detect();
 315         sni_pcimt_sc_init();
 316         ioport_resource.end = sni_io_resource.end;
 317 #ifdef CONFIG_PCI
 318         PCIBIOS_MIN_IO = 0x9000;
 319         register_pci_controller(&sni_controller);
 320 #endif
 321         sni_pcimt_resource_init();
 322 }
 323
 324 static int __init snirm_pcimt_setup_devinit(void)
 325 {
 326         switch (sni_brd_type) {
 327         case SNI_BRD_PCI_MTOWER:
 328         case SNI_BRD_PCI_DESKTOP:
 329         case SNI_BRD_PCI_MTOWER_CPLUS:
 330                 platform_device_register(&pcimt_serial8250_device);
 331                 platform_device_register(&pcimt_cmos_device);
 332                 break;
 333         }
 334
 335         return 0;
 336 }
 337
 338 device_initcall(snirm_pcimt_setup_devinit);