arch/ppc/platforms/spruce.c

   1 /*
   2  * arch/ppc/platforms/spruce.c
   3  *
   4  * Board and PCI setup routines for IBM Spruce
   5  *
   6  * Author: MontaVista Software <source@mvista.com>
   7  *
   8  * 2000-2004 (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/seq_file.h>
  28 #include <linux/ide.h>
  29 #include <linux/root_dev.h>
  30 #include <linux/serial.h>
  31 #include <linux/tty.h>
  32 #include <linux/serial_core.h>
  33
  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/machdep.h>
  40 #include <asm/time.h>
  41 #include <asm/todc.h>
  42 #include <asm/bootinfo.h>
  43 #include <asm/kgdb.h>
  44
  45 #include <syslib/cpc700.h>
  46
  47 #include "spruce.h"
  48
  49 static inline int
  50 spruce_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
  51 {
  52         static char pci_irq_table[][4] =
  53                 /*
  54                  *      PCI IDSEL/INTPIN->INTLINE
  55                  *      A       B       C       D
  56                  */
  57         {
  58                 {23, 24, 25, 26},       /* IDSEL 1 - PCI slot 3 */
  59                 {24, 25, 26, 23},       /* IDSEL 2 - PCI slot 2 */
  60                 {25, 26, 23, 24},       /* IDSEL 3 - PCI slot 1 */
  61                 {26, 23, 24, 25},       /* IDSEL 4 - PCI slot 0 */
  62         };
  63
  64         const long min_idsel = 1, max_idsel = 4, irqs_per_slot = 4;
  65         return PCI_IRQ_TABLE_LOOKUP;
  66 }
  67
  68 static void __init
  69 spruce_setup_hose(void)
  70 {
  71         struct pci_controller *hose;
  72
  73         /* Setup hose */
  74         hose = pcibios_alloc_controller();
  75         if (!hose)
  76                 return;
  77
  78         hose->first_busno = 0;
  79         hose->last_busno = 0xff;
  80
  81         pci_init_resource(&hose->io_resource,
  82                         SPRUCE_PCI_LOWER_IO,
  83                         SPRUCE_PCI_UPPER_IO,
  84                         IORESOURCE_IO,
  85                         "PCI host bridge");
  86
  87         pci_init_resource(&hose->mem_resources[0],
  88                         SPRUCE_PCI_LOWER_MEM,
  89                         SPRUCE_PCI_UPPER_MEM,
  90                         IORESOURCE_MEM,
  91                         "PCI host bridge");
  92
  93         hose->io_space.start = SPRUCE_PCI_LOWER_IO;
  94         hose->io_space.end = SPRUCE_PCI_UPPER_IO;
  95         hose->mem_space.start = SPRUCE_PCI_LOWER_MEM;
  96         hose->mem_space.end = SPRUCE_PCI_UPPER_MEM;
  97         hose->io_base_virt = (void *)SPRUCE_ISA_IO_BASE;
  98
  99         setup_indirect_pci(hose,
 100                         SPRUCE_PCI_CONFIG_ADDR,
 101                         SPRUCE_PCI_CONFIG_DATA);
 102
 103         hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
 104
 105         ppc_md.pci_swizzle = common_swizzle;
 106         ppc_md.pci_map_irq = spruce_map_irq;
 107 }
 108
 109 /*
 110  * CPC700 PIC interrupt programming table
 111  *
 112  * First entry is the sensitivity (level/edge), second is the polarity.
 113  */
 114 unsigned int cpc700_irq_assigns[32][2] = {
 115         { 1, 1 },       /* IRQ  0: ECC Correctable Error - rising edge */
 116         { 1, 1 },       /* IRQ  1: PCI Write Mem Range   - rising edge */
 117         { 0, 1 },       /* IRQ  2: PCI Write Command Reg - active high */
 118         { 0, 1 },       /* IRQ  3: UART 0                - active high */
 119         { 0, 1 },       /* IRQ  4: UART 1                - active high */
 120         { 0, 1 },       /* IRQ  5: ICC 0                 - active high */
 121         { 0, 1 },       /* IRQ  6: ICC 1                 - active high */
 122         { 0, 1 },       /* IRQ  7: GPT Compare 0         - active high */
 123         { 0, 1 },       /* IRQ  8: GPT Compare 1         - active high */
 124         { 0, 1 },       /* IRQ  9: GPT Compare 2         - active high */
 125         { 0, 1 },       /* IRQ 10: GPT Compare 3         - active high */
 126         { 0, 1 },       /* IRQ 11: GPT Compare 4         - active high */
 127         { 0, 1 },       /* IRQ 12: GPT Capture 0         - active high */
 128         { 0, 1 },       /* IRQ 13: GPT Capture 1         - active high */
 129         { 0, 1 },       /* IRQ 14: GPT Capture 2         - active high */
 130         { 0, 1 },       /* IRQ 15: GPT Capture 3         - active high */
 131         { 0, 1 },       /* IRQ 16: GPT Capture 4         - active high */
 132         { 0, 0 },       /* IRQ 17: Reserved */
 133         { 0, 0 },       /* IRQ 18: Reserved */
 134         { 0, 0 },       /* IRQ 19: Reserved */
 135         { 0, 1 },       /* IRQ 20: FPGA EXT_IRQ0         - active high */
 136         { 1, 1 },       /* IRQ 21: Mouse                 - rising edge */
 137         { 1, 1 },       /* IRQ 22: Keyboard              - rising edge */
 138         { 0, 0 },       /* IRQ 23: PCI Slot 3            - active low */
 139         { 0, 0 },       /* IRQ 24: PCI Slot 2            - active low */
 140         { 0, 0 },       /* IRQ 25: PCI Slot 1            - active low */
 141         { 0, 0 },       /* IRQ 26: PCI Slot 0            - active low */
 142 };
 143
 144 static void __init
 145 spruce_calibrate_decr(void)
 146 {
 147         int freq, divisor = 4;
 148
 149         /* determine processor bus speed */
 150         freq = SPRUCE_BUS_SPEED;
 151         tb_ticks_per_jiffy = freq / HZ / divisor;
 152         tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
 153 }
 154
 155 static int
 156 spruce_show_cpuinfo(struct seq_file *m)
 157 {
 158         seq_printf(m, "vendor\t\t: IBM\n");
 159         seq_printf(m, "machine\t\t: Spruce\n");
 160
 161         return 0;
 162 }
 163
 164 static void __init
 165 spruce_early_serial_map(void)
 166 {
 167         u32 uart_clk;
 168         struct uart_port serial_req;
 169
 170         if (SPRUCE_UARTCLK_IS_33M(readb(SPRUCE_FPGA_REG_A)))
 171                 uart_clk = SPRUCE_BAUD_33M * 16;
 172         else
 173                 uart_clk = SPRUCE_BAUD_30M * 16;
 174
 175         /* Setup serial port access */
 176         memset(&serial_req, 0, sizeof(serial_req));
 177         serial_req.uartclk = uart_clk;
 178         serial_req.irq = UART0_INT;
 179         serial_req.flags = ASYNC_BOOT_AUTOCONF;
 180         serial_req.iotype = SERIAL_IO_MEM;
 181         serial_req.membase = (u_char *)UART0_IO_BASE;
 182         serial_req.regshift = 0;
 183
 184 #if defined(CONFIG_KGDB) || defined(CONFIG_SERIAL_TEXT_DEBUG)
 185         gen550_init(0, &serial_req);
 186 #endif
 187 #ifdef CONFIG_SERIAL_8250
 188         if (early_serial_setup(&serial_req) != 0)
 189                 printk("Early serial init of port 0 failed\n");
 190 #endif
 191
 192         /* Assume early_serial_setup() doesn't modify serial_req */
 193         serial_req.line = 1;
 194         serial_req.irq = UART1_INT;
 195         serial_req.membase = (u_char *)UART1_IO_BASE;
 196
 197 #if defined(CONFIG_KGDB) || defined(CONFIG_SERIAL_TEXT_DEBUG)
 198         gen550_init(1, &serial_req);
 199 #endif
 200 #ifdef CONFIG_SERIAL_8250
 201         if (early_serial_setup(&serial_req) != 0)
 202                 printk("Early serial init of port 1 failed\n");
 203 #endif
 204 }
 205
 206 TODC_ALLOC();
 207
 208 static void __init
 209 spruce_setup_arch(void)
 210 {
 211         /* Setup TODC access */
 212         TODC_INIT(TODC_TYPE_DS1643, 0, 0, SPRUCE_RTC_BASE_ADDR, 8);
 213
 214         /* init to some ~sane value until calibrate_delay() runs */
 215         loops_per_jiffy = 50000000 / HZ;
 216
 217         /* Setup PCI host bridge */
 218         spruce_setup_hose();
 219
 220 #ifdef CONFIG_BLK_DEV_INITRD
 221         if (initrd_start)
 222                 ROOT_DEV = Root_RAM0;
 223         else
 224 #endif
 225 #ifdef CONFIG_ROOT_NFS
 226                 ROOT_DEV = Root_NFS;
 227 #else
 228                 ROOT_DEV = Root_SDA1;
 229 #endif
 230
 231         /* Identify the system */
 232         printk(KERN_INFO "System Identification: IBM Spruce\n");
 233         printk(KERN_INFO "Port by MontaVista Software, Inc. (source@mvista.com)\n");
 234 }
 235
 236 static void
 237 spruce_restart(char *cmd)
 238 {
 239         local_irq_disable();
 240
 241         /* SRR0 has system reset vector, SRR1 has default MSR value */
 242         /* rfi restores MSR from SRR1 and sets the PC to the SRR0 value */
 243         __asm__ __volatile__
 244         ("\n\
 245         lis     3,0xfff0        \n\
 246         ori     3,3,0x0100      \n\
 247         mtspr   26,3            \n\
 248         li      3,0             \n\
 249         mtspr   27,3            \n\
 250         rfi                     \n\
 251         ");
 252         for(;;);
 253 }
 254
 255 static void
 256 spruce_power_off(void)
 257 {
 258         for(;;);
 259 }
 260
 261 static void
 262 spruce_halt(void)
 263 {
 264         spruce_restart(NULL);
 265 }
 266
 267 static void __init
 268 spruce_map_io(void)
 269 {
 270         io_block_mapping(SPRUCE_PCI_IO_BASE, SPRUCE_PCI_PHY_IO_BASE,
 271                          0x08000000, _PAGE_IO);
 272 }
 273
 274 /*
 275  * Set BAT 3 to map 0xf8000000 to end of physical memory space 1-to-1.
 276  */
 277 static __inline__ void
 278 spruce_set_bat(void)
 279 {
 280         mb();
 281         mtspr(SPRN_DBAT1U, 0xf8000ffe);
 282         mtspr(SPRN_DBAT1L, 0xf800002a);
 283         mb();
 284 }
 285
 286 void __init
 287 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 288               unsigned long r6, unsigned long r7)
 289 {
 290         parse_bootinfo(find_bootinfo());
 291
 292         /* Map in board regs, etc. */
 293         spruce_set_bat();
 294
 295         isa_io_base = SPRUCE_ISA_IO_BASE;
 296         pci_dram_offset = SPRUCE_PCI_SYS_MEM_BASE;
 297
 298         ppc_md.setup_arch = spruce_setup_arch;
 299         ppc_md.show_cpuinfo = spruce_show_cpuinfo;
 300         ppc_md.init_IRQ = cpc700_init_IRQ;
 301         ppc_md.get_irq = cpc700_get_irq;
 302
 303         ppc_md.setup_io_mappings = spruce_map_io;
 304
 305         ppc_md.restart = spruce_restart;
 306         ppc_md.power_off = spruce_power_off;
 307         ppc_md.halt = spruce_halt;
 308
 309         ppc_md.time_init = todc_time_init;
 310         ppc_md.set_rtc_time = todc_set_rtc_time;
 311         ppc_md.get_rtc_time = todc_get_rtc_time;
 312         ppc_md.calibrate_decr = spruce_calibrate_decr;
 313
 314         ppc_md.nvram_read_val = todc_direct_read_val;
 315         ppc_md.nvram_write_val = todc_direct_write_val;
 316
 317         spruce_early_serial_map();
 318
 319 #ifdef CONFIG_SERIAL_TEXT_DEBUG
 320         ppc_md.progress = gen550_progress;
 321 #endif /* CONFIG_SERIAL_TEXT_DEBUG */
 322 #ifdef CONFIG_KGDB
 323         ppc_md.kgdb_map_scc = gen550_kgdb_map_scc;
 324 #endif
 325 }