release/src-rt-6.x/linux/linux-2.6/arch/ppc/platforms/powerpmc250.c

   1 /*
   2  * Board setup routines for Force PowerPMC-250 Processor PMC
   3  *
   4  * Author: Troy Benjegerdes <tbenjegerdes@mvista.com>
   5  * Borrowed heavily from prpmc750_*.c by
   6  *      Matt Porter <mporter@mvista.com>
   7  *
   8  * 2001 (c) MontaVista, Software, Inc.  This file is licensed under
   9  * the terms of the GNU General Public License version 2.  This program
  10  * is licensed "as is" without any warranty of any kind, whether express
  11  * or implied.
  12  */
  13
  14 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/errno.h>
  18 #include <linux/reboot.h>
  19 #include <linux/pci.h>
  20 #include <linux/kdev_t.h>
  21 #include <linux/types.h>
  22 #include <linux/major.h>
  23 #include <linux/initrd.h>
  24 #include <linux/console.h>
  25 #include <linux/delay.h>
  26 #include <linux/slab.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/ide.h>
  29 #include <linux/root_dev.h>
  30
  31 #include <asm/byteorder.h>
  32 #include <asm/system.h>
  33 #include <asm/pgtable.h>
  34 #include <asm/page.h>
  35 #include <asm/dma.h>
  36 #include <asm/io.h>
  37 #include <asm/irq.h>
  38 #include <asm/machdep.h>
  39 #include <asm/time.h>
  40 #include <platforms/powerpmc250.h>
  41 #include <asm/open_pic.h>
  42 #include <asm/pci-bridge.h>
  43 #include <asm/mpc10x.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/bootinfo.h>
  46
  47 extern void powerpmc250_find_bridges(void);
  48 extern unsigned long loops_per_jiffy;
  49
  50 static u_char powerpmc250_openpic_initsenses[] __initdata =
  51 {
  52     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  53     1,  /* PMC INTA (also MPC107 output interrupt INTA) */
  54     1,  /* PMC INTB (also I82559 Ethernet controller) */
  55     1,  /* PMC INTC */
  56     1,  /* PMC INTD */
  57     0,  /* DUART interrupt (active high) */
  58 };
  59
  60 static int
  61 powerpmc250_show_cpuinfo(struct seq_file *m)
  62 {
  63         seq_printf(m,"machine\t\t: Force PowerPMC250\n");
  64
  65         return 0;
  66 }
  67
  68 static void __init
  69 powerpmc250_setup_arch(void)
  70 {
  71         /* init to some ~sane value until calibrate_delay() runs */
  72         loops_per_jiffy = 50000000/HZ;
  73
  74         /* Lookup PCI host bridges */
  75         powerpmc250_find_bridges();
  76
  77 #ifdef CONFIG_BLK_DEV_INITRD
  78         if (initrd_start)
  79                 ROOT_DEV = Root_RAM0;
  80         else
  81 #endif
  82 #ifdef CONFIG_ROOT_NFS
  83                 ROOT_DEV = Root_NFS;
  84 #else
  85                 ROOT_DEV = Root_SDA2;
  86 #endif
  87
  88         printk("Force PowerPMC250 port (C) 2001 MontaVista Software, Inc. (source@mvista.com)\n");
  89 }
  90
  91 #if 0
  92 /*
  93  * Compute the PrPMC750's bus speed using the baud clock as a
  94  * reference.
  95  */
  96 unsigned long __init powerpmc250_get_bus_speed(void)
  97 {
  98         unsigned long tbl_start, tbl_end;
  99         unsigned long current_state, old_state, bus_speed;
 100         unsigned char lcr, dll, dlm;
 101         int baud_divisor, count;
 102
 103         /* Read the UART's baud clock divisor */
 104         lcr = readb(PRPMC750_SERIAL_0_LCR);
 105         writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 106         dll = readb(PRPMC750_SERIAL_0_DLL);
 107         dlm = readb(PRPMC750_SERIAL_0_DLM);
 108         writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 109         baud_divisor = (dlm << 8) | dll;
 110
 111         /*
 112          * Use the baud clock divisor and base baud clock
 113          * to determine the baud rate and use that as
 114          * the number of baud clock edges we use for
 115          * the time base sample.  Make it half the baud
 116          * rate.
 117          */
 118         count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
 119
 120         /* Find the first edge of the baud clock */
 121         old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
 122         do {
 123                 current_state = readb(PRPMC750_STATUS_REG) &
 124                         PRPMC750_BAUDOUT_MASK;
 125         } while(old_state == current_state);
 126
 127         old_state = current_state;
 128
 129         /* Get the starting time base value */
 130         tbl_start = get_tbl();
 131
 132         /*
 133          * Loop until we have found a number of edges equal
 134          * to half the count (half the baud rate)
 135          */
 136         do {
 137                 do {
 138                         current_state = readb(PRPMC750_STATUS_REG) &
 139                                 PRPMC750_BAUDOUT_MASK;
 140                 } while(old_state == current_state);
 141                 old_state = current_state;
 142         } while (--count);
 143
 144         /* Get the ending time base value */
 145         tbl_end = get_tbl();
 146
 147         /* Compute bus speed */
 148         bus_speed = (tbl_end-tbl_start)*128;
 149
 150         return bus_speed;
 151 }
 152 #endif
 153
 154 static void __init
 155 powerpmc250_calibrate_decr(void)
 156 {
 157         unsigned long freq;
 158         int divisor = 4;
 159
 160         //freq = powerpmc250_get_bus_speed();
 161 #warning hardcoded bus freq
 162         freq = 100000000;
 163
 164         tb_ticks_per_jiffy = freq / (HZ * divisor);
 165         tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
 166 }
 167
 168 static void
 169 powerpmc250_restart(char *cmd)
 170 {
 171         local_irq_disable();
 172         /* Hard reset */
 173         writeb(0x11, 0xfe000332);
 174         while(1);
 175 }
 176
 177 static void
 178 powerpmc250_halt(void)
 179 {
 180         local_irq_disable();
 181         while (1);
 182 }
 183
 184 static void
 185 powerpmc250_power_off(void)
 186 {
 187         powerpmc250_halt();
 188 }
 189
 190 static void __init
 191 powerpmc250_init_IRQ(void)
 192 {
 193
 194         OpenPIC_InitSenses = powerpmc250_openpic_initsenses;
 195         OpenPIC_NumInitSenses = sizeof(powerpmc250_openpic_initsenses);
 196         mpc10x_set_openpic();
 197 }
 198
 199 /*
 200  * Set BAT 3 to map 0xf0000000 to end of physical memory space.
 201  */
 202 static __inline__ void
 203 powerpmc250_set_bat(void)
 204 {
 205         unsigned long   bat3u, bat3l;
 206         static int      mapping_set = 0;
 207
 208         if (!mapping_set)
 209         {
 210                 __asm__ __volatile__(
 211                                 " lis %0,0xf000\n \
 212                                 ori %1,%0,0x002a\n \
 213                                 ori %0,%0,0x1ffe\n \
 214                                 mtspr 0x21e,%0\n \
 215                                 mtspr 0x21f,%1\n \
 216                                 isync\n \
 217                                 sync "
 218                                 : "=r" (bat3u), "=r" (bat3l));
 219
 220                 mapping_set = 1;
 221         }
 222         return;
 223 }
 224
 225 static unsigned long __init
 226 powerpmc250_find_end_of_memory(void)
 227 {
 228         /* Cover I/O space with a BAT */
 229         /* yuck, better hope your ram size is a power of 2  -- paulus */
 230         powerpmc250_set_bat();
 231
 232         return mpc10x_get_mem_size(MPC10X_MEM_MAP_B);
 233 }
 234
 235 static void __init
 236 powerpmc250_map_io(void)
 237 {
 238         io_block_mapping(0xfe000000, 0xfe000000, 0x02000000, _PAGE_IO);
 239 }
 240
 241 void __init
 242 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 243               unsigned long r6, unsigned long r7)
 244 {
 245         parse_bootinfo(find_bootinfo());
 246
 247 #ifdef CONFIG_BLK_DEV_INITRD
 248         if ( r4 )
 249         {
 250                 initrd_start = r4 + KERNELBASE;
 251                 initrd_end = r5 + KERNELBASE;
 252         }
 253 #endif
 254
 255         /* Copy cmd_line parameters */
 256         if ( r6)
 257         {
 258                 *(char *)(r7 + KERNELBASE) = 0;
 259                 strcpy(cmd_line, (char *)(r6 + KERNELBASE));
 260         }
 261
 262         isa_io_base = MPC10X_MAPB_ISA_IO_BASE;
 263         isa_mem_base = MPC10X_MAPB_ISA_MEM_BASE;
 264         pci_dram_offset = MPC10X_MAPB_DRAM_OFFSET;
 265
 266         ppc_md.setup_arch       = powerpmc250_setup_arch;
 267         ppc_md.show_cpuinfo     = powerpmc250_show_cpuinfo;
 268         ppc_md.init_IRQ         = powerpmc250_init_IRQ;
 269         ppc_md.get_irq          = openpic_get_irq;
 270
 271         ppc_md.find_end_of_memory = powerpmc250_find_end_of_memory;
 272         ppc_md.setup_io_mappings = powerpmc250_map_io;
 273
 274         ppc_md.restart          = powerpmc250_restart;
 275         ppc_md.power_off        = powerpmc250_power_off;
 276         ppc_md.halt             = powerpmc250_halt;
 277
 278         /* PowerPMC250 has no timekeeper part */
 279         ppc_md.time_init        = NULL;
 280         ppc_md.get_rtc_time     = NULL;
 281         ppc_md.set_rtc_time     = NULL;
 282         ppc_md.calibrate_decr   = powerpmc250_calibrate_decr;
 283 }
 284
 285
 286 /*
 287  * (This used to be arch/ppc/platforms/powerpmc250_pci.c)
 288  *
 289  * PCI support for Force PowerPMC250
 290  *
 291  */
 292
 293 #undef DEBUG
 294 #ifdef DEBUG
 295 #define DBG(x...) printk(x)
 296 #else
 297 #define DBG(x...)
 298 #endif /* DEBUG */
 299
 300 static inline int __init
 301 powerpmc250_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
 302 {
 303         static char pci_irq_table[][4] =
 304         /*
 305          *      PCI IDSEL/INTPIN->INTLINE
 306          *      A       B       C       D
 307          */
 308         {
 309                 {17,    0,      0,      0},     /* Device 11 - 82559 */
 310                 {0,     0,      0,      0},     /* 12 */
 311                 {0,     0,      0,      0},     /* 13 */
 312                 {0,     0,      0,      0},     /* 14 */
 313                 {0,     0,      0,      0},     /* 15 */
 314                 {16,    17,     18,     19},    /* Device 16 - PMC A1?? */
 315                 };
 316         const long min_idsel = 11, max_idsel = 16, irqs_per_slot = 4;
 317         return PCI_IRQ_TABLE_LOOKUP;
 318 };
 319
 320 static int
 321 powerpmc250_exclude_device(u_char bus, u_char devfn)
 322 {
 323         /*
 324          * While doing PCI Scan  the MPC107 will 'detect' itself as
 325          * device on the PCI Bus, will create an incorrect response and
 326          * later will respond incorrectly to Configuration read coming
 327          * from another device.
 328          *
 329          * The work around is that when doing a PCI Scan one
 330          * should skip its own device number in the scan.
 331          *
 332          * The top IDsel is AD13 and the middle is AD14.
 333          *
 334          * -- Note from force
 335          */
 336
 337         if ((bus == 0) && (PCI_SLOT(devfn) == 13 || PCI_SLOT(devfn) == 14)) {
 338                 return PCIBIOS_DEVICE_NOT_FOUND;
 339         }
 340         else {
 341                 return PCIBIOS_SUCCESSFUL;
 342         }
 343 }
 344
 345 void __init
 346 powerpmc250_find_bridges(void)
 347 {
 348         struct pci_controller* hose;
 349
 350         hose = pcibios_alloc_controller();
 351         if (!hose){
 352                 printk("Can't allocate PCI 'hose' structure!!!\n");
 353                 return;
 354         }
 355
 356         hose->first_busno = 0;
 357         hose->last_busno = 0xff;
 358
 359         if (mpc10x_bridge_init(hose,
 360                         MPC10X_MEM_MAP_B,
 361                         MPC10X_MEM_MAP_B,
 362                         MPC10X_MAPB_EUMB_BASE) == 0) {
 363
 364                 hose->mem_resources[0].end = 0xffffffff;
 365
 366                 hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
 367
 368                 /* ppc_md.pcibios_fixup = pcore_pcibios_fixup; */
 369                 ppc_md.pci_swizzle = common_swizzle;
 370
 371                 ppc_md.pci_exclude_device = powerpmc250_exclude_device;
 372                 ppc_md.pci_map_irq = powerpmc250_map_irq;
 373         } else {
 374                 if (ppc_md.progress)
 375                         ppc_md.progress("Bridge init failed", 0x100);
 376                 printk("Host bridge init failed\n");
 377         }
 378
 379 }