arch/ppc/platforms/prpmc750.c

   1 /*
   2  * arch/ppc/platforms/prpmc750_setup.c
   3  *
   4  * Board setup routines for Motorola PrPMC750
   5  *
   6  * Author: Matt Porter <mporter@mvista.com>
   7  *
   8  * 2001-2004 (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/config.h>
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/errno.h>
  19 #include <linux/reboot.h>
  20 #include <linux/pci.h>
  21 #include <linux/kdev_t.h>
  22 #include <linux/types.h>
  23 #include <linux/major.h>
  24 #include <linux/initrd.h>
  25 #include <linux/console.h>
  26 #include <linux/delay.h>
  27 #include <linux/irq.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/ide.h>
  30 #include <linux/root_dev.h>
  31 #include <linux/slab.h>
  32 #include <linux/serial_reg.h>
  33
  34 #include <asm/byteorder.h>
  35 #include <asm/system.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/page.h>
  38 #include <asm/dma.h>
  39 #include <asm/io.h>
  40 #include <asm/irq.h>
  41 #include <asm/machdep.h>
  42 #include <asm/pci-bridge.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/time.h>
  45 #include <asm/open_pic.h>
  46 #include <asm/bootinfo.h>
  47 #include <asm/hawk.h>
  48
  49 #include "prpmc750.h"
  50
  51 extern unsigned long loops_per_jiffy;
  52
  53 extern void gen550_progress(char *, unsigned short);
  54
  55 static u_char prpmc750_openpic_initsenses[] __initdata =
  56 {
  57     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT0 */
  58     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UART */
  59     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_DEBUGINT */
  60     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HAWK_WDT */
  61     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  62     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_ABORT */
  63     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT1 */
  64     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT2 */
  65     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT3 */
  66     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTA */
  67     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTB */
  68     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTC */
  69     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTD */
  70     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  71     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  72     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  73 };
  74
  75 /*
  76  * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
  77  * Combined irq tables.  Only Base has IDSEL 14, only Carrier has 21 and 22.
  78  */
  79 static inline int
  80 prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
  81 {
  82         static char pci_irq_table[][4] =
  83         /*
  84          *      PCI IDSEL/INTPIN->INTLINE
  85          *      A       B       C       D
  86          */
  87         {
  88                 {12,    0,      0,      0},  /* IDSEL 14 - Ethernet, base */
  89                 {0,     0,      0,      0},  /* IDSEL 15 - unused */
  90                 {10,    11,     12,     9},  /* IDSEL 16 - PMC A1, PMC1 */
  91                 {10,    11,     12,     9},  /* IDSEL 17 - PrPMC-A-B, PMC2-B */
  92                 {11,    12,     9,      10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
  93                 {0,     0,      0,      0},  /* IDSEL 19 - unused */
  94                 {9,     10,     11,     12}, /* IDSEL 20 - P2P Bridge */
  95                 {11,    12,     9,      10}, /* IDSEL 21 - PMC A2, carrier */
  96                 {12,    9,      10,     11}, /* IDSEL 22 - PMC A2-B, carrier */
  97         };
  98         const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
  99         return PCI_IRQ_TABLE_LOOKUP;
 100 };
 101
 102 static void __init prpmc750_pcibios_fixup(void)
 103 {
 104         struct pci_dev *dev;
 105         unsigned short wtmp;
 106
 107         /*
 108          * Kludge to clean up after PPC6BUG which doesn't
 109          * configure the CL5446 VGA card.  Also the
 110          * resource subsystem doesn't fixup the
 111          * PCI mem resources on the CL5446.
 112          */
 113         if ((dev = pci_get_device(PCI_VENDOR_ID_CIRRUS,
 114                                    PCI_DEVICE_ID_CIRRUS_5446, 0))) {
 115                 dev->resource[0].start += PRPMC750_PCI_PHY_MEM_OFFSET;
 116                 dev->resource[0].end += PRPMC750_PCI_PHY_MEM_OFFSET;
 117                 pci_read_config_word(dev, PCI_COMMAND, &wtmp);
 118                 pci_write_config_word(dev, PCI_COMMAND, wtmp | 3);
 119                 /* Enable Color mode in MISC reg */
 120                 outb(0x03, 0x3c2);
 121                 /* Select DRAM config reg */
 122                 outb(0x0f, 0x3c4);
 123                 /* Set proper DRAM config */
 124                 outb(0xdf, 0x3c5);
 125                 pci_dev_put(dev);
 126         }
 127 }
 128
 129 void __init prpmc750_find_bridges(void)
 130 {
 131         struct pci_controller *hose;
 132
 133         hose = pcibios_alloc_controller();
 134         if (!hose)
 135                 return;
 136
 137         hose->first_busno = 0;
 138         hose->last_busno = 0xff;
 139         hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE;
 140         hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_OFFSET;
 141
 142         pci_init_resource(&hose->io_resource,
 143                           PRPMC750_PCI_IO_START,
 144                           PRPMC750_PCI_IO_END,
 145                           IORESOURCE_IO, "PCI host bridge");
 146
 147         pci_init_resource(&hose->mem_resources[0],
 148                           PRPMC750_PROC_PCI_MEM_START,
 149                           PRPMC750_PROC_PCI_MEM_END,
 150                           IORESOURCE_MEM, "PCI host bridge");
 151
 152         hose->io_space.start = PRPMC750_PCI_IO_START;
 153         hose->io_space.end = PRPMC750_PCI_IO_END;
 154         hose->mem_space.start = PRPMC750_PCI_MEM_START;
 155         hose->mem_space.end = PRPMC750_PCI_MEM_END - HAWK_MPIC_SIZE;
 156
 157         if (hawk_init(hose, PRPMC750_HAWK_PPC_REG_BASE,
 158                       PRPMC750_PROC_PCI_MEM_START,
 159                       PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE,
 160                       PRPMC750_PROC_PCI_IO_START, PRPMC750_PROC_PCI_IO_END,
 161                       PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE + 1)
 162             != 0) {
 163                 printk(KERN_CRIT "Could not initialize host bridge\n");
 164         }
 165
 166         hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
 167
 168         ppc_md.pcibios_fixup = prpmc750_pcibios_fixup;
 169         ppc_md.pci_swizzle = common_swizzle;
 170         ppc_md.pci_map_irq = prpmc_map_irq;
 171 }
 172 static int prpmc750_show_cpuinfo(struct seq_file *m)
 173 {
 174         seq_printf(m, "machine\t\t: PrPMC750\n");
 175
 176         return 0;
 177 }
 178
 179 static void __init prpmc750_setup_arch(void)
 180 {
 181         /* init to some ~sane value until calibrate_delay() runs */
 182         loops_per_jiffy = 50000000 / HZ;
 183
 184         /* Lookup PCI host bridges */
 185         prpmc750_find_bridges();
 186
 187 #ifdef CONFIG_BLK_DEV_INITRD
 188         if (initrd_start)
 189                 ROOT_DEV = Root_RAM0;
 190         else
 191 #endif
 192 #ifdef CONFIG_ROOT_NFS
 193                 ROOT_DEV = Root_NFS;
 194 #else
 195                 ROOT_DEV = Root_SDA2;
 196 #endif
 197
 198         OpenPIC_InitSenses = prpmc750_openpic_initsenses;
 199         OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses);
 200
 201         printk(KERN_INFO "Port by MontaVista Software, Inc. "
 202                         "(source@mvista.com)\n");
 203 }
 204
 205 /*
 206  * Compute the PrPMC750's bus speed using the baud clock as a
 207  * reference.
 208  */
 209 static unsigned long __init prpmc750_get_bus_speed(void)
 210 {
 211         unsigned long tbl_start, tbl_end;
 212         unsigned long current_state, old_state, bus_speed;
 213         unsigned char lcr, dll, dlm;
 214         int baud_divisor, count;
 215
 216         /* Read the UART's baud clock divisor */
 217         lcr = readb(PRPMC750_SERIAL_0_LCR);
 218         writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 219         dll = readb(PRPMC750_SERIAL_0_DLL);
 220         dlm = readb(PRPMC750_SERIAL_0_DLM);
 221         writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 222         baud_divisor = (dlm << 8) | dll;
 223
 224         /*
 225          * Use the baud clock divisor and base baud clock
 226          * to determine the baud rate and use that as
 227          * the number of baud clock edges we use for
 228          * the time base sample.  Make it half the baud
 229          * rate.
 230          */
 231         count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
 232
 233         /* Find the first edge of the baud clock */
 234         old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
 235         do {
 236                 current_state = readb(PRPMC750_STATUS_REG) &
 237                     PRPMC750_BAUDOUT_MASK;
 238         } while (old_state == current_state);
 239
 240         old_state = current_state;
 241
 242         /* Get the starting time base value */
 243         tbl_start = get_tbl();
 244
 245         /*
 246          * Loop until we have found a number of edges equal
 247          * to half the count (half the baud rate)
 248          */
 249         do {
 250                 do {
 251                         current_state = readb(PRPMC750_STATUS_REG) &
 252                             PRPMC750_BAUDOUT_MASK;
 253                 } while (old_state == current_state);
 254                 old_state = current_state;
 255         } while (--count);
 256
 257         /* Get the ending time base value */
 258         tbl_end = get_tbl();
 259
 260         /* Compute bus speed */
 261         bus_speed = (tbl_end - tbl_start) * 128;
 262
 263         return bus_speed;
 264 }
 265
 266 static void __init prpmc750_calibrate_decr(void)
 267 {
 268         unsigned long freq;
 269         int divisor = 4;
 270
 271         freq = prpmc750_get_bus_speed();
 272
 273         tb_ticks_per_jiffy = freq / (HZ * divisor);
 274         tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
 275 }
 276
 277 static void prpmc750_restart(char *cmd)
 278 {
 279         local_irq_disable();
 280         writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
 281         while (1) ;
 282 }
 283
 284 static void prpmc750_halt(void)
 285 {
 286         local_irq_disable();
 287         while (1) ;
 288 }
 289
 290 static void prpmc750_power_off(void)
 291 {
 292         prpmc750_halt();
 293 }
 294
 295 static void __init prpmc750_init_IRQ(void)
 296 {
 297         openpic_init(0);
 298 }
 299
 300 /*
 301  * Set BAT 3 to map 0xf0000000 to end of physical memory space.
 302  */
 303 static __inline__ void prpmc750_set_bat(void)
 304 {
 305         mb();
 306         mtspr(SPRN_DBAT1U, 0xf0001ffe);
 307         mtspr(SPRN_DBAT1L, 0xf000002a);
 308         mb();
 309 }
 310
 311 /*
 312  * We need to read the Falcon/Hawk memory controller
 313  * to properly determine this value
 314  */
 315 static unsigned long __init prpmc750_find_end_of_memory(void)
 316 {
 317         /* Read the memory size from the Hawk SMC */
 318         return hawk_get_mem_size(PRPMC750_HAWK_SMC_BASE);
 319 }
 320
 321 static void __init prpmc750_map_io(void)
 322 {
 323         io_block_mapping(PRPMC750_ISA_IO_BASE, PRPMC750_ISA_IO_BASE,
 324                          0x10000000, _PAGE_IO);
 325 #if 0
 326         io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO);
 327 #endif
 328         io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _PAGE_IO);
 329 }
 330
 331 void __init
 332 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 333               unsigned long r6, unsigned long r7)
 334 {
 335         parse_bootinfo(find_bootinfo());
 336
 337         /* Cover the Hawk registers with a BAT */
 338         prpmc750_set_bat();
 339
 340         isa_io_base = PRPMC750_ISA_IO_BASE;
 341         isa_mem_base = PRPMC750_ISA_MEM_BASE;
 342         pci_dram_offset = PRPMC750_PCI_DRAM_OFFSET;
 343
 344         ppc_md.setup_arch = prpmc750_setup_arch;
 345         ppc_md.show_cpuinfo = prpmc750_show_cpuinfo;
 346         ppc_md.init_IRQ = prpmc750_init_IRQ;
 347         ppc_md.get_irq = openpic_get_irq;
 348
 349         ppc_md.find_end_of_memory = prpmc750_find_end_of_memory;
 350         ppc_md.setup_io_mappings = prpmc750_map_io;
 351
 352         ppc_md.restart = prpmc750_restart;
 353         ppc_md.power_off = prpmc750_power_off;
 354         ppc_md.halt = prpmc750_halt;
 355
 356         /* PrPMC750 has no timekeeper part */
 357         ppc_md.time_init = NULL;
 358         ppc_md.get_rtc_time = NULL;
 359         ppc_md.set_rtc_time = NULL;
 360         ppc_md.calibrate_decr = prpmc750_calibrate_decr;
 361
 362 #ifdef  CONFIG_SERIAL_TEXT_DEBUG
 363         ppc_md.progress = gen550_progress;
 364 #endif                          /* CONFIG_SERIAL_TEXT_DEBUG */
 365 }