2 * Copyright (C) 1995 Linus Torvalds
3 * Adapted from 'alpha' version by Gary Thomas
4 * Modified by Cort Dougan (cort@cs.nmt.edu)
5 * Synergy Microsystems board support by Dan Cox (dan@synergymicro.com)
9 #include <linux/config.h>
10 #include <linux/stddef.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/errno.h>
14 #include <linux/reboot.h>
15 #include <linux/pci.h>
16 #include <linux/time.h>
17 #include <linux/kdev_t.h>
18 #include <linux/types.h>
19 #include <linux/major.h>
20 #include <linux/initrd.h>
21 #include <linux/console.h>
22 #include <linux/seq_file.h>
23 #include <linux/root_dev.h>
24 #include <linux/bcd.h>
26 #include <asm/system.h>
27 #include <asm/pgtable.h>
31 #include <asm/m48t35.h>
32 #include <platforms/gemini.h>
34 #include <asm/open_pic.h>
35 #include <asm/bootinfo.h>
36 #include <asm/machdep.h>
38 void gemini_find_bridges(void);
39 static int gemini_get_clock_speed(void);
40 extern void gemini_pcibios_fixup(void);
42 static char *gemini_board_families[] = {
43 "VGM", "VSS", "KGM", "VGR", "VCM", "VCS", "KCM", "VCR"
45 static int gemini_board_count = sizeof(gemini_board_families) /
46 sizeof(gemini_board_families[0]);
48 static unsigned int cpu_7xx[16] = {
49 0, 15, 14, 0, 0, 13, 5, 9, 6, 11, 8, 10, 16, 12, 7, 0
51 static unsigned int cpu_6xx[16] = {
52 0, 0, 14, 0, 0, 13, 5, 9, 6, 11, 8, 10, 0, 12, 7, 0
56 * prom_init is the Gemini version of prom.c:prom_init. We only need
57 * the BSS clearing code, so I copied that out of prom.c. This is a
58 * lot simpler than hacking prom.c so it will build with Gemini. -VAL
61 #define PTRRELOC(x) ((typeof(x))((unsigned long)(x) + offset))
66 unsigned long offset = reloc_offset();
68 extern char __bss_start, _end;
70 /* First zero the BSS -- use memset, some arches don't have
72 memset_io(PTRRELOC(&__bss_start),0 , &_end - &__bss_start);
75 phys = offset + KERNELBASE;
83 gemini_show_cpuinfo(struct seq_file *m)
85 unsigned char reg, rev;
89 reg = readb(GEMINI_FEAT);
90 family = gemini_board_families[((reg>>4) & 0xf)];
91 if (((reg>>4) & 0xf) > gemini_board_count)
92 printk(KERN_ERR "cpuinfo(): unable to determine board family\n");
94 reg = readb(GEMINI_BREV);
95 type = (reg>>4) & 0xf;
98 reg = readb(GEMINI_BECO);
100 seq_printf(m, "machine\t\t: Gemini %s%d, rev %c, eco %d\n",
101 family, type, (rev + 'A'), (reg & 0xf));
103 seq_printf(m, "board\t\t: Gemini %s", family);
105 seq_printf(m, "%c", (type - 10) + 'A');
107 seq_printf(m, "%d", type);
109 seq_printf(m, ", rev %c, eco %d\n", (rev + 'A'), (reg & 0xf));
111 seq_printf(m, "clock\t\t: %dMhz\n", gemini_get_clock_speed());
116 static u_char gemini_openpic_initsenses[] = {
123 1, /* remainder are level-triggered */
126 #define GEMINI_MPIC_ADDR (0xfcfc0000)
127 #define GEMINI_MPIC_PCI_CFG (0x80005800)
129 void __init gemini_openpic_init(void)
132 OpenPIC_Addr = (volatile struct OpenPIC *)
133 grackle_read(GEMINI_MPIC_PCI_CFG + 0x10);
134 OpenPIC_InitSenses = gemini_openpic_initsenses;
135 OpenPIC_NumInitSenses = sizeof( gemini_openpic_initsenses );
137 ioremap( GEMINI_MPIC_ADDR, OPENPIC_SIZE);
141 extern unsigned long loops_per_jiffy;
142 extern int root_mountflags;
143 extern char cmd_line[];
146 gemini_heartbeat(void)
148 static unsigned long led = GEMINI_LEDBASE+(4*8);
149 static char direction = 8;
152 /* We only want to do this on 1 CPU */
153 if (smp_processor_id())
156 if ( (led + direction) > (GEMINI_LEDBASE+(7*8)) ||
157 (led + direction) < (GEMINI_LEDBASE+(4*8)) )
161 ppc_md.heartbeat_count = ppc_md.heartbeat_reset;
164 void __init gemini_setup_arch(void)
166 extern char cmd_line[];
169 loops_per_jiffy = 50000000/HZ;
171 #ifdef CONFIG_BLK_DEV_INITRD
172 /* bootable off CDROM */
177 ROOT_DEV = Root_SDA1;
179 /* nothing but serial consoles... */
180 sprintf(cmd_line, "%s console=ttyS0", cmd_line);
182 printk("Boot arguments: %s\n", cmd_line);
184 ppc_md.heartbeat = gemini_heartbeat;
185 ppc_md.heartbeat_reset = HZ/8;
186 ppc_md.heartbeat_count = 1;
188 /* Lookup PCI hosts */
189 gemini_find_bridges();
190 /* take special pains to map the MPIC, since it isn't mapped yet */
191 gemini_openpic_init();
198 gemini_get_clock_speed(void)
200 unsigned long hid1, pvr;
203 pvr = mfspr(SPRN_PVR);
204 hid1 = (mfspr(SPRN_HID1) >> 28) & 0xf;
205 if (PVR_VER(pvr) == 8 ||
207 hid1 = cpu_7xx[hid1];
209 hid1 = cpu_6xx[hid1];
211 switch((readb(GEMINI_BSTAT) & 0xc) >> 2) {
215 clock = (hid1*100)/3;
219 clock = (hid1*125)/3;
230 void __init gemini_init_l2(void)
232 unsigned char reg, brev, fam, creg;
236 reg = readb(GEMINI_L2CFG);
237 brev = readb(GEMINI_BREV);
238 fam = readb(GEMINI_FEAT);
239 pvr = mfspr(SPRN_PVR);
241 switch(PVR_VER(pvr)) {
245 cache = (((reg >> 6) & 0x3) << 28);
250 /* Pre-3.0 processor revs had snooping errata. Leave
251 their L2's disabled with SMP. -- Dan */
252 if (PVR_CFG(pvr) < 3) {
253 printk("Pre-3.0 750; L2 left disabled!\n");
256 #endif /* CONFIG_SMP */
258 /* Special case: VGM5-B's came before L2 ratios were set on
259 the board. Processor speed shouldn't be too high, so
260 set L2 ratio to 1:1.5. */
261 if ((brev == 0x51) && ((fam & 0xa0) >> 4) == 0)
264 /* determine best cache ratio based upon what the board
265 tells us (which sometimes _may_ not be true) and
266 the processor speed. */
268 if (gemini_get_clock_speed() > 250)
274 static unsigned long l2_size_val = 0;
277 l2_size_val = _get_L2CR();
283 creg = readb(GEMINI_CPUSTAT);
284 if (((creg & 0xc) >> 2) != 1)
285 printk("Dual-604 boards don't support the use of L2\n");
287 writeb(1, GEMINI_L2CFG);
290 printk("Unknown processor; L2 left disabled\n");
294 cache |= ((1<<reg) << 25);
295 cache |= (L2CR_L2RAM_MASK|L2CR_L2CTL|L2CR_L2DO);
297 _set_L2CR(cache | L2CR_L2E);
302 gemini_restart(char *cmd)
305 /* make a clean restart, not via the MPIC */
311 gemini_power_off(void)
319 gemini_restart(NULL);
322 void __init gemini_init_IRQ(void)
324 /* gemini has no 8259 */
325 openpic_init(1, 0, 0, -1);
328 #define gemini_rtc_read(x) (readb(GEMINI_RTC+(x)))
329 #define gemini_rtc_write(val,x) (writeb((val),(GEMINI_RTC+(x))))
331 /* ensure that the RTC is up and running */
332 long __init gemini_time_init(void)
336 reg = gemini_rtc_read(M48T35_RTC_CONTROL);
338 if ( reg & M48T35_RTC_STOPPED ) {
339 printk(KERN_INFO "M48T35 real-time-clock was stopped. Now starting...\n");
340 gemini_rtc_write((reg & ~(M48T35_RTC_STOPPED)), M48T35_RTC_CONTROL);
341 gemini_rtc_write((reg | M48T35_RTC_SET), M48T35_RTC_CONTROL);
349 gemini_get_rtc_time(void)
351 unsigned int year, mon, day, hour, min, sec;
354 reg = gemini_rtc_read(M48T35_RTC_CONTROL);
355 gemini_rtc_write((reg|M48T35_RTC_READ), M48T35_RTC_CONTROL);
357 printk("get rtc: reg = %x\n", reg);
361 sec = gemini_rtc_read(M48T35_RTC_SECONDS);
362 min = gemini_rtc_read(M48T35_RTC_MINUTES);
363 hour = gemini_rtc_read(M48T35_RTC_HOURS);
364 day = gemini_rtc_read(M48T35_RTC_DOM);
365 mon = gemini_rtc_read(M48T35_RTC_MONTH);
366 year = gemini_rtc_read(M48T35_RTC_YEAR);
367 } while( sec != gemini_rtc_read(M48T35_RTC_SECONDS));
369 printk("get rtc: sec=%x, min=%x, hour=%x, day=%x, mon=%x, year=%x\n",
370 sec, min, hour, day, mon, year);
373 gemini_rtc_write(reg, M48T35_RTC_CONTROL);
382 if ((year += 1900) < 1970)
385 printk("get rtc: sec=%x, min=%x, hour=%x, day=%x, mon=%x, year=%x\n",
386 sec, min, hour, day, mon, year);
389 return mktime( year, mon, day, hour, min, sec );
394 gemini_set_rtc_time( unsigned long now )
401 reg = gemini_rtc_read(M48T35_RTC_CONTROL);
403 printk("set rtc: reg = %x\n", reg);
406 gemini_rtc_write((reg|M48T35_RTC_SET), M48T35_RTC_CONTROL);
408 printk("set rtc: tm vals - sec=%x, min=%x, hour=%x, mon=%x, mday=%x, year=%x\n",
409 tm.tm_sec, tm.tm_min, tm.tm_hour, tm.tm_mon, tm.tm_mday, tm.tm_year);
413 BIN_TO_BCD(tm.tm_sec);
414 BIN_TO_BCD(tm.tm_min);
415 BIN_TO_BCD(tm.tm_hour);
416 BIN_TO_BCD(tm.tm_mon);
417 BIN_TO_BCD(tm.tm_mday);
418 BIN_TO_BCD(tm.tm_year);
420 printk("set rtc: tm vals - sec=%x, min=%x, hour=%x, mon=%x, mday=%x, year=%x\n",
421 tm.tm_sec, tm.tm_min, tm.tm_hour, tm.tm_mon, tm.tm_mday, tm.tm_year);
424 gemini_rtc_write(tm.tm_sec, M48T35_RTC_SECONDS);
425 gemini_rtc_write(tm.tm_min, M48T35_RTC_MINUTES);
426 gemini_rtc_write(tm.tm_hour, M48T35_RTC_HOURS);
427 gemini_rtc_write(tm.tm_mday, M48T35_RTC_DOM);
428 gemini_rtc_write(tm.tm_mon, M48T35_RTC_MONTH);
429 gemini_rtc_write(tm.tm_year, M48T35_RTC_YEAR);
432 gemini_rtc_write(reg, M48T35_RTC_CONTROL);
437 /* use the RTC to determine the decrementer count */
438 void __init gemini_calibrate_decr(void)
443 /* determine processor bus speed */
444 reg = readb(GEMINI_BSTAT);
446 switch(((reg & 0x0c)>>2)&0x3) {
461 tb_ticks_per_jiffy = freq / HZ / divisor;
462 tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
465 unsigned long __init gemini_find_end_of_memory(void)
470 reg = readb(GEMINI_MEMCFG);
471 total = ((1<<((reg & 0x7) - 1)) *
472 (8<<((reg >> 3) & 0x7)));
473 total *= (1024*1024);
480 io_block_mapping(0xf0000000, 0xf0000000, 0x10000000, _PAGE_IO);
481 io_block_mapping(0x80000000, 0x80000000, 0x10000000, _PAGE_IO);
486 smp_gemini_probe(void)
490 nr = (readb(GEMINI_CPUSTAT) & GEMINI_CPU_COUNT_MASK) >> 2;
495 openpic_request_IPIs();
496 for (i = 1; i < nr; ++i)
504 smp_gemini_kick_cpu(int nr)
506 openpic_reset_processor_phys(1 << nr);
507 openpic_reset_processor_phys(0);
511 smp_gemini_setup_cpu(int cpu_nr)
514 do_openpic_setup_cpu();
519 static struct smp_ops_t gemini_smp_ops = {
520 smp_openpic_message_pass,
523 smp_gemini_setup_cpu,
524 .give_timebase = smp_generic_give_timebase,
525 .take_timebase = smp_generic_take_timebase,
527 #endif /* CONFIG_SMP */
529 void __init platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
530 unsigned long r6, unsigned long r7)
534 /* Restore BATs for now */
535 mtspr(SPRN_DBAT3U, 0xf0001fff);
536 mtspr(SPRN_DBAT3L, 0xf000002a);
538 parse_bootinfo(find_bootinfo());
540 for(i = 0; i < GEMINI_LEDS; i++)
543 ISA_DMA_THRESHOLD = 0;
547 #ifdef CONFIG_BLK_DEV_INITRD
550 initrd_start = r4 + KERNELBASE;
551 initrd_end = r5 + KERNELBASE;
555 ppc_md.setup_arch = gemini_setup_arch;
556 ppc_md.show_cpuinfo = gemini_show_cpuinfo;
557 ppc_md.init_IRQ = gemini_init_IRQ;
558 ppc_md.get_irq = openpic_get_irq;
561 ppc_md.restart = gemini_restart;
562 ppc_md.power_off = gemini_power_off;
563 ppc_md.halt = gemini_halt;
565 ppc_md.time_init = gemini_time_init;
566 ppc_md.set_rtc_time = gemini_set_rtc_time;
567 ppc_md.get_rtc_time = gemini_get_rtc_time;
568 ppc_md.calibrate_decr = gemini_calibrate_decr;
570 ppc_md.find_end_of_memory = gemini_find_end_of_memory;
571 ppc_md.setup_io_mappings = gemini_map_io;
573 ppc_md.pcibios_fixup_bus = gemini_pcibios_fixup;
576 smp_ops = &gemini_smp_ops;
577 #endif /* CONFIG_SMP */