arch/ppc/platforms/lopec.c

   1 /*
   2  * arch/ppc/platforms/lopec.c
   3  *
   4  * Setup routines for the Motorola LoPEC.
   5  *
   6  * Author: Dan Cox
   7  * Maintainer: Tom Rini <trini@kernel.crashing.org>
   8  *
   9  * 2001-2004 (c) MontaVista, Software, Inc.  This file is licensed under
  10  * the terms of the GNU General Public License version 2.  This program
  11  * is licensed "as is" without any warranty of any kind, whether express
  12  * or implied.
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/types.h>
  17 #include <linux/delay.h>
  18 #include <linux/pci_ids.h>
  19 #include <linux/ioport.h>
  20 #include <linux/init.h>
  21 #include <linux/ide.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/initrd.h>
  24 #include <linux/console.h>
  25 #include <linux/root_dev.h>
  26 #include <linux/pci.h>
  27
  28 #include <asm/machdep.h>
  29 #include <asm/pci-bridge.h>
  30 #include <asm/io.h>
  31 #include <asm/open_pic.h>
  32 #include <asm/i8259.h>
  33 #include <asm/todc.h>
  34 #include <asm/bootinfo.h>
  35 #include <asm/mpc10x.h>
  36 #include <asm/hw_irq.h>
  37 #include <asm/prep_nvram.h>
  38 #include <asm/kgdb.h>
  39
  40 /*
  41  * Define all of the IRQ senses and polarities.  Taken from the
  42  * LoPEC Programmer's Reference Guide.
  43  */
  44 static u_char lopec_openpic_initsenses[16] __initdata = {
  45         (IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE),      /* IRQ 0 */
  46         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),      /* IRQ 1 */
  47         (IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE),      /* IRQ 2 */
  48         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),      /* IRQ 3 */
  49         (IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE),      /* IRQ 4 */
  50         (IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE),      /* IRQ 5 */
  51         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),      /* IRQ 6 */
  52         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),      /* IRQ 7 */
  53         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),      /* IRQ 8 */
  54         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),      /* IRQ 9 */
  55         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),      /* IRQ 10 */
  56         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),      /* IRQ 11 */
  57         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),      /* IRQ 12 */
  58         (IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE),      /* IRQ 13 */
  59         (IRQ_SENSE_EDGE | IRQ_POLARITY_NEGATIVE),       /* IRQ 14 */
  60         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE)       /* IRQ 15 */
  61 };
  62
  63 static inline int __init
  64 lopec_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
  65 {
  66         int irq;
  67         static char pci_irq_table[][4] = {
  68                 {16, 0, 0, 0}, /* ID 11 - Winbond */
  69                 {22, 0, 0, 0}, /* ID 12 - SCSI */
  70                 {0, 0, 0, 0}, /* ID 13 - nothing */
  71                 {17, 0, 0, 0}, /* ID 14 - 82559 Ethernet */
  72                 {27, 0, 0, 0}, /* ID 15 - USB */
  73                 {23, 0, 0, 0}, /* ID 16 - PMC slot 1 */
  74                 {24, 0, 0, 0}, /* ID 17 - PMC slot 2 */
  75                 {25, 0, 0, 0}, /* ID 18 - PCI slot */
  76                 {0, 0, 0, 0}, /* ID 19 - nothing */
  77                 {0, 0, 0, 0}, /* ID 20 - nothing */
  78                 {0, 0, 0, 0}, /* ID 21 - nothing */
  79                 {0, 0, 0, 0}, /* ID 22 - nothing */
  80                 {0, 0, 0, 0}, /* ID 23 - nothing */
  81                 {0, 0, 0, 0}, /* ID 24 - PMC slot 1b */
  82                 {0, 0, 0, 0}, /* ID 25 - nothing */
  83                 {0, 0, 0, 0}  /* ID 26 - PMC Slot 2b */
  84         };
  85         const long min_idsel = 11, max_idsel = 26, irqs_per_slot = 4;
  86
  87         irq = PCI_IRQ_TABLE_LOOKUP;
  88         if (!irq)
  89                 return 0;
  90
  91         return irq;
  92 }
  93
  94 static void __init
  95 lopec_setup_winbond_83553(struct pci_controller *hose)
  96 {
  97         int devfn;
  98
  99         devfn = PCI_DEVFN(11,0);
 100
 101         /* IDE interrupt routing (primary 14, secondary 15) */
 102         early_write_config_byte(hose, 0, devfn, 0x43, 0xef);
 103         /* PCI interrupt routing */
 104         early_write_config_word(hose, 0, devfn, 0x44, 0x0000);
 105
 106         /* ISA-PCI address decoder */
 107         early_write_config_byte(hose, 0, devfn, 0x48, 0xf0);
 108
 109         /* RTC, kb, not used in PPC */
 110         early_write_config_byte(hose, 0, devfn, 0x4d, 0x00);
 111         early_write_config_byte(hose, 0, devfn, 0x4e, 0x04);
 112         devfn = PCI_DEVFN(11, 1);
 113         early_write_config_byte(hose, 0, devfn, 0x09, 0x8f);
 114         early_write_config_dword(hose, 0, devfn, 0x40, 0x00ff0011);
 115 }
 116
 117 static void __init
 118 lopec_find_bridges(void)
 119 {
 120         struct pci_controller *hose;
 121
 122         hose = pcibios_alloc_controller();
 123         if (!hose)
 124                 return;
 125
 126         hose->first_busno = 0;
 127         hose->last_busno = 0xff;
 128
 129         if (mpc10x_bridge_init(hose, MPC10X_MEM_MAP_B, MPC10X_MEM_MAP_B,
 130                                 MPC10X_MAPB_EUMB_BASE) == 0) {
 131
 132                 hose->mem_resources[0].end = 0xffffffff;
 133                 lopec_setup_winbond_83553(hose);
 134                 hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
 135                 ppc_md.pci_swizzle = common_swizzle;
 136                 ppc_md.pci_map_irq = lopec_map_irq;
 137         }
 138 }
 139
 140 static int
 141 lopec_show_cpuinfo(struct seq_file *m)
 142 {
 143         seq_printf(m, "machine\t\t: Motorola LoPEC\n");
 144         return 0;
 145 }
 146
 147 static void
 148 lopec_restart(char *cmd)
 149 {
 150 #define LOPEC_SYSSTAT1 0xffe00000
 151         /* force a hard reset, if possible */
 152         unsigned char reg = *((unsigned char *) LOPEC_SYSSTAT1);
 153         reg |= 0x80;
 154         *((unsigned char *) LOPEC_SYSSTAT1) = reg;
 155
 156         local_irq_disable();
 157         while(1);
 158 #undef LOPEC_SYSSTAT1
 159 }
 160
 161 static void
 162 lopec_halt(void)
 163 {
 164         local_irq_disable();
 165         while(1);
 166 }
 167
 168 static void
 169 lopec_power_off(void)
 170 {
 171         lopec_halt();
 172 }
 173
 174 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
 175 int lopec_ide_ports_known = 0;
 176 static unsigned long lopec_ide_regbase[MAX_HWIFS];
 177 static unsigned long lopec_ide_ctl_regbase[MAX_HWIFS];
 178 static unsigned long lopec_idedma_regbase;
 179
 180 static void
 181 lopec_ide_probe(void)
 182 {
 183         struct pci_dev *dev = pci_get_device(PCI_VENDOR_ID_WINBOND,
 184                                               PCI_DEVICE_ID_WINBOND_82C105,
 185                                               NULL);
 186         lopec_ide_ports_known = 1;
 187
 188         if (dev) {
 189                 lopec_ide_regbase[0] = dev->resource[0].start;
 190                 lopec_ide_regbase[1] = dev->resource[2].start;
 191                 lopec_ide_ctl_regbase[0] = dev->resource[1].start;
 192                 lopec_ide_ctl_regbase[1] = dev->resource[3].start;
 193                 lopec_idedma_regbase = dev->resource[4].start;
 194                 pci_dev_put(dev);
 195         }
 196 }
 197
 198 static int
 199 lopec_ide_default_irq(unsigned long base)
 200 {
 201         if (lopec_ide_ports_known == 0)
 202                 lopec_ide_probe();
 203
 204         if (base == lopec_ide_regbase[0])
 205                 return 14;
 206         else if (base == lopec_ide_regbase[1])
 207                 return 15;
 208         else
 209                 return 0;
 210 }
 211
 212 static unsigned long
 213 lopec_ide_default_io_base(int index)
 214 {
 215         if (lopec_ide_ports_known == 0)
 216                 lopec_ide_probe();
 217         return lopec_ide_regbase[index];
 218 }
 219
 220 static void __init
 221 lopec_ide_init_hwif_ports(hw_regs_t *hw, unsigned long data,
 222                           unsigned long ctl, int *irq)
 223 {
 224         unsigned long reg = data;
 225         uint alt_status_base;
 226         int i;
 227
 228         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 229                 hw->io_ports[i] = reg++;
 230
 231         if (data == lopec_ide_regbase[0]) {
 232                 alt_status_base = lopec_ide_ctl_regbase[0] + 2;
 233                 hw->irq = 14;
 234         } else if (data == lopec_ide_regbase[1]) {
 235                 alt_status_base = lopec_ide_ctl_regbase[1] + 2;
 236                 hw->irq = 15;
 237         } else {
 238                 alt_status_base = 0;
 239                 hw->irq = 0;
 240         }
 241
 242         if (ctl)
 243                 hw->io_ports[IDE_CONTROL_OFFSET] = ctl;
 244         else
 245                 hw->io_ports[IDE_CONTROL_OFFSET] = alt_status_base;
 246
 247         if (irq != NULL)
 248                 *irq = hw->irq;
 249
 250 }
 251 #endif /* BLK_DEV_IDE */
 252
 253 static void __init
 254 lopec_init_IRQ(void)
 255 {
 256         int i;
 257
 258         /*
 259          * Provide the open_pic code with the correct table of interrupts.
 260          */
 261         OpenPIC_InitSenses = lopec_openpic_initsenses;
 262         OpenPIC_NumInitSenses = sizeof(lopec_openpic_initsenses);
 263
 264         mpc10x_set_openpic();
 265
 266         /* We have a cascade on OpenPIC IRQ 0, Linux IRQ 16 */
 267         openpic_hookup_cascade(NUM_8259_INTERRUPTS, "82c59 cascade",
 268                         &i8259_irq);
 269
 270         /*
 271          * The EPIC allows for a read in the range of 0xFEF00000 ->
 272          * 0xFEFFFFFF to generate a PCI interrupt-acknowledge transaction.
 273          */
 274         i8259_init(0xfef00000, 0);
 275 }
 276
 277 static int __init
 278 lopec_request_io(void)
 279 {
 280         outb(0x00, 0x4d0);
 281         outb(0xc0, 0x4d1);
 282
 283         request_region(0x00, 0x20, "dma1");
 284         request_region(0x20, 0x20, "pic1");
 285         request_region(0x40, 0x20, "timer");
 286         request_region(0x80, 0x10, "dma page reg");
 287         request_region(0xa0, 0x20, "pic2");
 288         request_region(0xc0, 0x20, "dma2");
 289
 290         return 0;
 291 }
 292
 293 device_initcall(lopec_request_io);
 294
 295 static void __init
 296 lopec_map_io(void)
 297 {
 298         io_block_mapping(0xf0000000, 0xf0000000, 0x10000000, _PAGE_IO);
 299         io_block_mapping(0xb0000000, 0xb0000000, 0x10000000, _PAGE_IO);
 300 }
 301
 302 /*
 303  * Set BAT 3 to map 0xf8000000 to end of physical memory space 1-to-1.
 304  */
 305 static __inline__ void
 306 lopec_set_bat(void)
 307 {
 308         mb();
 309         mtspr(SPRN_DBAT1U, 0xf8000ffe);
 310         mtspr(SPRN_DBAT1L, 0xf800002a);
 311         mb();
 312 }
 313
 314 TODC_ALLOC();
 315
 316 static void __init
 317 lopec_setup_arch(void)
 318 {
 319
 320         TODC_INIT(TODC_TYPE_MK48T37, 0, 0,
 321                   ioremap(0xffe80000, 0x8000), 8);
 322
 323         loops_per_jiffy = 100000000/HZ;
 324
 325         lopec_find_bridges();
 326
 327 #ifdef CONFIG_BLK_DEV_INITRD
 328         if (initrd_start)
 329                 ROOT_DEV = Root_RAM0;
 330         else
 331 #elif defined(CONFIG_ROOT_NFS)
 332                 ROOT_DEV = Root_NFS;
 333 #elif defined(CONFIG_BLK_DEV_IDEDISK)
 334                 ROOT_DEV = Root_HDA1;
 335 #else
 336                 ROOT_DEV = Root_SDA1;
 337 #endif
 338
 339 #ifdef CONFIG_PPCBUG_NVRAM
 340         /* Read in NVRAM data */
 341         init_prep_nvram();
 342
 343         /* if no bootargs, look in NVRAM */
 344         if ( cmd_line[0] == '\0' ) {
 345                 char *bootargs;
 346                  bootargs = prep_nvram_get_var("bootargs");
 347                  if (bootargs != NULL) {
 348                          strcpy(cmd_line, bootargs);
 349                          /* again.. */
 350                          strcpy(saved_command_line, cmd_line);
 351                 }
 352         }
 353 #endif
 354 }
 355
 356 void __init
 357 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 358               unsigned long r6, unsigned long r7)
 359 {
 360         parse_bootinfo(find_bootinfo());
 361         lopec_set_bat();
 362
 363         isa_io_base = MPC10X_MAPB_ISA_IO_BASE;
 364         isa_mem_base = MPC10X_MAPB_ISA_MEM_BASE;
 365         pci_dram_offset = MPC10X_MAPB_DRAM_OFFSET;
 366         ISA_DMA_THRESHOLD = 0x00ffffff;
 367         DMA_MODE_READ = 0x44;
 368         DMA_MODE_WRITE = 0x48;
 369         ppc_do_canonicalize_irqs = 1;
 370
 371         ppc_md.setup_arch = lopec_setup_arch;
 372         ppc_md.show_cpuinfo = lopec_show_cpuinfo;
 373         ppc_md.init_IRQ = lopec_init_IRQ;
 374         ppc_md.get_irq = openpic_get_irq;
 375
 376         ppc_md.restart = lopec_restart;
 377         ppc_md.power_off = lopec_power_off;
 378         ppc_md.halt = lopec_halt;
 379
 380         ppc_md.setup_io_mappings = lopec_map_io;
 381
 382         ppc_md.time_init = todc_time_init;
 383         ppc_md.set_rtc_time = todc_set_rtc_time;
 384         ppc_md.get_rtc_time = todc_get_rtc_time;
 385         ppc_md.calibrate_decr = todc_calibrate_decr;
 386
 387         ppc_md.nvram_read_val = todc_direct_read_val;
 388         ppc_md.nvram_write_val = todc_direct_write_val;
 389
 390 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
 391         ppc_ide_md.default_irq = lopec_ide_default_irq;
 392         ppc_ide_md.default_io_base = lopec_ide_default_io_base;
 393         ppc_ide_md.ide_init_hwif = lopec_ide_init_hwif_ports;
 394 #endif
 395 #ifdef CONFIG_SERIAL_TEXT_DEBUG
 396         ppc_md.progress = gen550_progress;
 397 #endif
 398 }