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