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