arch/ppc/platforms/powerpmc250.c

   1 /*
   2  * arch/ppc/platforms/powerpmc250.c
   3  *
   4  * Board setup routines for Force PowerPMC-250 Processor PMC
   5  *
   6  * Author: Troy Benjegerdes <tbenjegerdes@mvista.com>
   7  * Borrowed heavily from prpmc750_*.c by
   8  *      Matt Porter <mporter@mvista.com>
   9  *
  10  * 2001 (c) MontaVista, Software, Inc.  This file is licensed under
  11  * the terms of the GNU General Public License version 2.  This program
  12  * is licensed "as is" without any warranty of any kind, whether express
  13  * or implied.
  14  */
  15
  16 #include <linux/config.h>
  17 #include <linux/stddef.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/errno.h>
  21 #include <linux/reboot.h>
  22 #include <linux/pci.h>
  23 #include <linux/kdev_t.h>
  24 #include <linux/types.h>
  25 #include <linux/major.h>
  26 #include <linux/initrd.h>
  27 #include <linux/console.h>
  28 #include <linux/delay.h>
  29 #include <linux/irq.h>
  30 #include <linux/slab.h>
  31 #include <linux/seq_file.h>
  32 #include <linux/ide.h>
  33 #include <linux/root_dev.h>
  34
  35 #include <asm/byteorder.h>
  36 #include <asm/system.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/page.h>
  39 #include <asm/dma.h>
  40 #include <asm/io.h>
  41 #include <asm/irq.h>
  42 #include <asm/machdep.h>
  43 #include <asm/time.h>
  44 #include <platforms/powerpmc250.h>
  45 #include <asm/open_pic.h>
  46 #include <asm/pci-bridge.h>
  47 #include <asm/mpc10x.h>
  48 #include <asm/uaccess.h>
  49 #include <asm/bootinfo.h>
  50
  51 extern void powerpmc250_find_bridges(void);
  52 extern unsigned long loops_per_jiffy;
  53
  54 static u_char powerpmc250_openpic_initsenses[] __initdata =
  55 {
  56     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  57     1,  /* PMC INTA (also MPC107 output interrupt INTA) */
  58     1,  /* PMC INTB (also I82559 Ethernet controller) */
  59     1,  /* PMC INTC */
  60     1,  /* PMC INTD */
  61     0,  /* DUART interrupt (active high) */
  62 };
  63
  64 static int
  65 powerpmc250_show_cpuinfo(struct seq_file *m)
  66 {
  67         seq_printf(m,"machine\t\t: Force PowerPMC250\n");
  68
  69         return 0;
  70 }
  71
  72 static void __init
  73 powerpmc250_setup_arch(void)
  74 {
  75         /* init to some ~sane value until calibrate_delay() runs */
  76         loops_per_jiffy = 50000000/HZ;
  77
  78         /* Lookup PCI host bridges */
  79         powerpmc250_find_bridges();
  80
  81 #ifdef CONFIG_BLK_DEV_INITRD
  82         if (initrd_start)
  83                 ROOT_DEV = Root_RAM0;
  84         else
  85 #endif
  86 #ifdef CONFIG_ROOT_NFS
  87                 ROOT_DEV = Root_NFS;
  88 #else
  89                 ROOT_DEV = Root_SDA2;
  90 #endif
  91
  92         printk("Force PowerPMC250 port (C) 2001 MontaVista Software, Inc. (source@mvista.com)\n");
  93 }
  94
  95 #if 0
  96 /*
  97  * Compute the PrPMC750's bus speed using the baud clock as a
  98  * reference.
  99  */
 100 unsigned long __init powerpmc250_get_bus_speed(void)
 101 {
 102         unsigned long tbl_start, tbl_end;
 103         unsigned long current_state, old_state, bus_speed;
 104         unsigned char lcr, dll, dlm;
 105         int baud_divisor, count;
 106
 107         /* Read the UART's baud clock divisor */
 108         lcr = readb(PRPMC750_SERIAL_0_LCR);
 109         writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 110         dll = readb(PRPMC750_SERIAL_0_DLL);
 111         dlm = readb(PRPMC750_SERIAL_0_DLM);
 112         writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 113         baud_divisor = (dlm << 8) | dll;
 114
 115         /*
 116          * Use the baud clock divisor and base baud clock
 117          * to determine the baud rate and use that as
 118          * the number of baud clock edges we use for
 119          * the time base sample.  Make it half the baud
 120          * rate.
 121          */
 122         count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
 123
 124         /* Find the first edge of the baud clock */
 125         old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
 126         do {
 127                 current_state = readb(PRPMC750_STATUS_REG) &
 128                         PRPMC750_BAUDOUT_MASK;
 129         } while(old_state == current_state);
 130
 131         old_state = current_state;
 132
 133         /* Get the starting time base value */
 134         tbl_start = get_tbl();
 135
 136         /*
 137          * Loop until we have found a number of edges equal
 138          * to half the count (half the baud rate)
 139          */
 140         do {
 141                 do {
 142                         current_state = readb(PRPMC750_STATUS_REG) &
 143                                 PRPMC750_BAUDOUT_MASK;
 144                 } while(old_state == current_state);
 145                 old_state = current_state;
 146         } while (--count);
 147
 148         /* Get the ending time base value */
 149         tbl_end = get_tbl();
 150
 151         /* Compute bus speed */
 152         bus_speed = (tbl_end-tbl_start)*128;
 153
 154         return bus_speed;
 155 }
 156 #endif
 157
 158 static void __init
 159 powerpmc250_calibrate_decr(void)
 160 {
 161         unsigned long freq;
 162         int divisor = 4;
 163
 164         //freq = powerpmc250_get_bus_speed();
 165 #warning hardcoded bus freq
 166         freq = 100000000;
 167
 168         tb_ticks_per_jiffy = freq / (HZ * divisor);
 169         tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
 170 }
 171
 172 static void
 173 powerpmc250_restart(char *cmd)
 174 {
 175         local_irq_disable();
 176         /* Hard reset */
 177         writeb(0x11, 0xfe000332);
 178         while(1);
 179 }
 180
 181 static void
 182 powerpmc250_halt(void)
 183 {
 184         local_irq_disable();
 185         while (1);
 186 }
 187
 188 static void
 189 powerpmc250_power_off(void)
 190 {
 191         powerpmc250_halt();
 192 }
 193
 194 static void __init
 195 powerpmc250_init_IRQ(void)
 196 {
 197
 198         OpenPIC_InitSenses = powerpmc250_openpic_initsenses;
 199         OpenPIC_NumInitSenses = sizeof(powerpmc250_openpic_initsenses);
 200         mpc10x_set_openpic();
 201 }
 202
 203 /*
 204  * Set BAT 3 to map 0xf0000000 to end of physical memory space.
 205  */
 206 static __inline__ void
 207 powerpmc250_set_bat(void)
 208 {
 209         unsigned long   bat3u, bat3l;
 210         static int      mapping_set = 0;
 211
 212         if (!mapping_set)
 213         {
 214                 __asm__ __volatile__(
 215                                 " lis %0,0xf000\n \
 216                                 ori %1,%0,0x002a\n \
 217                                 ori %0,%0,0x1ffe\n \
 218                                 mtspr 0x21e,%0\n \
 219                                 mtspr 0x21f,%1\n \
 220                                 isync\n \
 221                                 sync "
 222                                 : "=r" (bat3u), "=r" (bat3l));
 223
 224                 mapping_set = 1;
 225         }
 226         return;
 227 }
 228
 229 static unsigned long __init
 230 powerpmc250_find_end_of_memory(void)
 231 {
 232         /* Cover I/O space with a BAT */
 233         /* yuck, better hope your ram size is a power of 2  -- paulus */
 234         powerpmc250_set_bat();
 235
 236         return mpc10x_get_mem_size(MPC10X_MEM_MAP_B);
 237 }
 238
 239 static void __init
 240 powerpmc250_map_io(void)
 241 {
 242         io_block_mapping(0xfe000000, 0xfe000000, 0x02000000, _PAGE_IO);
 243 }
 244
 245 void __init
 246 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 247               unsigned long r6, unsigned long r7)
 248 {
 249         parse_bootinfo(find_bootinfo());
 250
 251 #ifdef CONFIG_BLK_DEV_INITRD
 252         if ( r4 )
 253         {
 254                 initrd_start = r4 + KERNELBASE;
 255                 initrd_end = r5 + KERNELBASE;
 256         }
 257 #endif
 258
 259         /* Copy cmd_line parameters */
 260         if ( r6)
 261         {
 262                 *(char *)(r7 + KERNELBASE) = 0;
 263                 strcpy(cmd_line, (char *)(r6 + KERNELBASE));
 264         }
 265
 266         isa_io_base = MPC10X_MAPB_ISA_IO_BASE;
 267         isa_mem_base = MPC10X_MAPB_ISA_MEM_BASE;
 268         pci_dram_offset = MPC10X_MAPB_DRAM_OFFSET;
 269
 270         ppc_md.setup_arch       = powerpmc250_setup_arch;
 271         ppc_md.show_cpuinfo     = powerpmc250_show_cpuinfo;
 272         ppc_md.init_IRQ         = powerpmc250_init_IRQ;
 273         ppc_md.get_irq          = openpic_get_irq;
 274
 275         ppc_md.find_end_of_memory = powerpmc250_find_end_of_memory;
 276         ppc_md.setup_io_mappings = powerpmc250_map_io;
 277
 278         ppc_md.restart          = powerpmc250_restart;
 279         ppc_md.power_off        = powerpmc250_power_off;
 280         ppc_md.halt             = powerpmc250_halt;
 281
 282         /* PowerPMC250 has no timekeeper part */
 283         ppc_md.time_init        = NULL;
 284         ppc_md.get_rtc_time     = NULL;
 285         ppc_md.set_rtc_time     = NULL;
 286         ppc_md.calibrate_decr   = powerpmc250_calibrate_decr;
 287 }
 288
 289
 290 /*
 291  * (This used to be arch/ppc/platforms/powerpmc250_pci.c)
 292  *
 293  * PCI support for Force PowerPMC250
 294  *
 295  */
 296
 297 #undef DEBUG
 298 #ifdef DEBUG
 299 #define DBG(x...) printk(x)
 300 #else
 301 #define DBG(x...)
 302 #endif /* DEBUG */
 303
 304 static inline int __init
 305 powerpmc250_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
 306 {
 307         static char pci_irq_table[][4] =
 308         /*
 309          *      PCI IDSEL/INTPIN->INTLINE
 310          *      A       B       C       D
 311          */
 312         {
 313                 {17,    0,      0,      0},     /* Device 11 - 82559 */
 314                 {0,     0,      0,      0},     /* 12 */
 315                 {0,     0,      0,      0},     /* 13 */
 316                 {0,     0,      0,      0},     /* 14 */
 317                 {0,     0,      0,      0},     /* 15 */
 318                 {16,    17,     18,     19},    /* Device 16 - PMC A1?? */
 319                 };
 320         const long min_idsel = 11, max_idsel = 16, irqs_per_slot = 4;
 321         return PCI_IRQ_TABLE_LOOKUP;
 322 };
 323
 324 static int
 325 powerpmc250_exclude_device(u_char bus, u_char devfn)
 326 {
 327         /*
 328          * While doing PCI Scan  the MPC107 will 'detect' itself as
 329          * device on the PCI Bus, will create an incorrect response and
 330          * later will respond incorrectly to Configuration read coming
 331          * from another device.
 332          *
 333          * The work around is that when doing a PCI Scan one
 334          * should skip its own device number in the scan.
 335          *
 336          * The top IDsel is AD13 and the middle is AD14.
 337          *
 338          * -- Note from force
 339          */
 340
 341         if ((bus == 0) && (PCI_SLOT(devfn) == 13 || PCI_SLOT(devfn) == 14)) {
 342                 return PCIBIOS_DEVICE_NOT_FOUND;
 343         }
 344         else {
 345                 return PCIBIOS_SUCCESSFUL;
 346         }
 347 }
 348
 349 void __init
 350 powerpmc250_find_bridges(void)
 351 {
 352         struct pci_controller* hose;
 353
 354         hose = pcibios_alloc_controller();
 355         if (!hose){
 356                 printk("Can't allocate PCI 'hose' structure!!!\n");
 357                 return;
 358         }
 359
 360         hose->first_busno = 0;
 361         hose->last_busno = 0xff;
 362
 363         if (mpc10x_bridge_init(hose,
 364                         MPC10X_MEM_MAP_B,
 365                         MPC10X_MEM_MAP_B,
 366                         MPC10X_MAPB_EUMB_BASE) == 0) {
 367
 368                 hose->mem_resources[0].end = 0xffffffff;
 369
 370                 hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
 371
 372                 /* ppc_md.pcibios_fixup = pcore_pcibios_fixup; */
 373                 ppc_md.pci_swizzle = common_swizzle;
 374
 375                 ppc_md.pci_exclude_device = powerpmc250_exclude_device;
 376                 ppc_md.pci_map_irq = powerpmc250_map_irq;
 377         } else {
 378                 if (ppc_md.progress)
 379                         ppc_md.progress("Bridge init failed", 0x100);
 380                 printk("Host bridge init failed\n");
 381         }
 382
 383 }