2 * arch/ppc/kernel/setup.c
4 * Copyright (C) 1995 Linus Torvalds
5 * Adapted from 'alpha' version by Gary Thomas
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net)
8 * Further modified for generic 8xx by Dan.
12 * bootup setup stuff..
15 #include <linux/config.h>
16 #include <linux/errno.h>
17 #include <linux/sched.h>
18 #include <linux/kernel.h>
20 #include <linux/stddef.h>
21 #include <linux/unistd.h>
22 #include <linux/ptrace.h>
23 #include <linux/slab.h>
24 #include <linux/user.h>
25 #include <linux/a.out.h>
26 #include <linux/tty.h>
27 #include <linux/major.h>
28 #include <linux/interrupt.h>
29 #include <linux/reboot.h>
30 #include <linux/init.h>
31 #include <linux/initrd.h>
32 #include <linux/ioport.h>
33 #include <linux/bootmem.h>
34 #include <linux/seq_file.h>
35 #include <linux/root_dev.h>
39 #include <asm/residual.h>
41 #include <asm/pgtable.h>
42 #include <asm/mpc8xx.h>
43 #include <asm/8xx_immap.h>
44 #include <asm/machdep.h>
45 #include <asm/bootinfo.h>
49 #include "ppc8xx_pic.h"
51 static int m8xx_set_rtc_time(unsigned long time);
52 static unsigned long m8xx_get_rtc_time(void);
53 void m8xx_calibrate_decr(void);
55 unsigned char __res[sizeof(bd_t)];
57 extern void m8xx_ide_init(void);
59 extern unsigned long find_available_memory(void);
60 extern void m8xx_cpm_reset(void);
61 extern void m8xx_wdt_handler_install(bd_t *bp);
62 extern void rpxfb_alloc_pages(void);
63 extern void cpm_interrupt_init(void);
65 void __attribute__ ((weak))
73 /* Reset the Communication Processor Module.
82 ROOT_DEV = Root_HDA1; /* hda1 */
85 #ifdef CONFIG_BLK_DEV_INITRD
87 ROOT_DEV = Root_FD0; /* floppy */
92 #if 0 /* XXX this may need to be updated for the new bootmem stuff,
93 or possibly just deleted (see set_phys_avail() in init.c).
95 /* initrd_start and size are setup by boot/head.S and kernel/head.S */
98 if (initrd_end > *memory_end_p)
100 printk("initrd extends beyond end of memory "
101 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
102 initrd_end,*memory_end_p);
117 machine_restart(NULL);
123 /* A place holder for time base interrupts, if they are ever enabled. */
124 irqreturn_t timebase_interrupt(int irq, void * dev, struct pt_regs * regs)
126 printk ("timebase_interrupt()\n");
131 static struct irqaction tbint_irqaction = {
132 .handler = timebase_interrupt,
133 .mask = CPU_MASK_NONE,
137 /* The decrementer counts at the system (internal) clock frequency divided by
138 * sixteen, or external oscillator divided by four. We force the processor
139 * to use system clock divided by sixteen.
141 void __init m8xx_calibrate_decr(void)
143 bd_t *binfo = (bd_t *)__res;
144 int freq, fp, divisor;
146 /* Unlock the SCCR. */
147 ((volatile immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk = ~KAPWR_KEY;
148 ((volatile immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk = KAPWR_KEY;
150 /* Force all 8xx processors to use divide by 16 processor clock. */
151 ((volatile immap_t *)IMAP_ADDR)->im_clkrst.car_sccr |= 0x02000000;
153 /* Processor frequency is MHz.
154 * The value 'fp' is the number of decrementer ticks per second.
156 fp = binfo->bi_intfreq / 16;
157 freq = fp*60; /* try to make freq/1e6 an integer */
159 printk("Decrementer Frequency = %d/%d\n", freq, divisor);
160 tb_ticks_per_jiffy = freq / HZ / divisor;
161 tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
163 /* Perform some more timer/timebase initialization. This used
164 * to be done elsewhere, but other changes caused it to get
165 * called more than once....that is a bad thing.
167 * First, unlock all of the registers we are going to modify.
168 * To protect them from corruption during power down, registers
169 * that are maintained by keep alive power are "locked". To
170 * modify these registers we have to write the key value to
171 * the key location associated with the register.
172 * Some boards power up with these unlocked, while others
173 * are locked. Writing anything (including the unlock code?)
174 * to the unlocked registers will lock them again. So, here
175 * we guarantee the registers are locked, then we unlock them
178 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk = ~KAPWR_KEY;
179 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck = ~KAPWR_KEY;
180 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk = ~KAPWR_KEY;
181 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk = KAPWR_KEY;
182 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck = KAPWR_KEY;
183 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk = KAPWR_KEY;
185 /* Disable the RTC one second and alarm interrupts. */
186 ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc &=
187 ~(RTCSC_SIE | RTCSC_ALE);
189 ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc |=
190 (RTCSC_RTF | RTCSC_RTE);
192 /* Enabling the decrementer also enables the timebase interrupts
193 * (or from the other point of view, to get decrementer interrupts
194 * we have to enable the timebase). The decrementer interrupt
195 * is wired into the vector table, nothing to do here for that.
197 ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_tbscr =
198 ((mk_int_int_mask(DEC_INTERRUPT) << 8) |
199 (TBSCR_TBF | TBSCR_TBE));
201 if (setup_irq(DEC_INTERRUPT, &tbint_irqaction))
202 panic("Could not allocate timer IRQ!");
204 #ifdef CONFIG_8xx_WDT
205 /* Install watchdog timer handler early because it might be
206 * already enabled by the bootloader
208 m8xx_wdt_handler_install(binfo);
212 /* The RTC on the MPC8xx is an internal register.
213 * We want to protect this during power down, so we need to unlock,
214 * modify, and re-lock.
217 m8xx_set_rtc_time(unsigned long time)
219 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck = KAPWR_KEY;
220 ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtc = time;
221 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck = ~KAPWR_KEY;
226 m8xx_get_rtc_time(void)
228 /* Get time from the RTC. */
229 return((unsigned long)(((immap_t *)IMAP_ADDR)->im_sit.sit_rtc));
233 m8xx_restart(char *cmd)
235 __volatile__ unsigned char dummy;
238 ((immap_t *)IMAP_ADDR)->im_clkrst.car_plprcr |= 0x00000080;
240 /* Clear the ME bit in MSR to cause checkstop on machine check
242 mtmsr(mfmsr() & ~0x1000);
244 dummy = ((immap_t *)IMAP_ADDR)->im_clkrst.res[0];
245 printk("Restart failed\n");
263 m8xx_show_percpuinfo(struct seq_file *m, int i)
269 seq_printf(m, "clock\t\t: %uMHz\n"
270 "bus clock\t: %uMHz\n",
271 bp->bi_intfreq / 1000000,
272 bp->bi_busfreq / 1000000);
278 static struct irqaction mbx_i8259_irqaction = {
279 .handler = mbx_i8259_action,
280 .mask = CPU_MASK_NONE,
281 .name = "i8259 cascade",
285 /* Initialize the internal interrupt controller. The number of
286 * interrupts supported can vary with the processor type, and the
287 * 82xx family can have up to 64.
288 * External interrupts can be either edge or level triggered, and
289 * need to be initialized by the appropriate driver.
296 for (i = SIU_IRQ_OFFSET ; i < SIU_IRQ_OFFSET + NR_SIU_INTS ; i++)
297 irq_desc[i].handler = &ppc8xx_pic;
299 cpm_interrupt_init();
301 #if defined(CONFIG_PCI)
302 for (i = I8259_IRQ_OFFSET ; i < I8259_IRQ_OFFSET + NR_8259_INTS ; i++)
303 irq_desc[i].handler = &i8259_pic;
305 i8259_pic_irq_offset = I8259_IRQ_OFFSET;
308 /* The i8259 cascade interrupt must be level sensitive. */
309 ((immap_t *)IMAP_ADDR)->im_siu_conf.sc_siel &=
310 ~(0x80000000 >> ISA_BRIDGE_INT);
312 if (setup_irq(ISA_BRIDGE_INT, &mbx_i8259_irqaction))
313 enable_irq(ISA_BRIDGE_INT);
314 #endif /* CONFIG_PCI */
317 /* -------------------------------------------------------------------- */
320 * This is a big hack right now, but it may turn into something real
323 * For the 8xx boards (at this time anyway), there is nothing to initialize
324 * associated the PROM. Rather than include all of the prom.c
325 * functions in the image just to get prom_init, all we really need right
326 * now is the initialization of the physical memory region.
328 static unsigned long __init
329 m8xx_find_end_of_memory(void)
332 extern unsigned char __res[];
334 binfo = (bd_t *)__res;
336 return binfo->bi_memsize;
340 * Now map in some of the I/O space that is generically needed
341 * or shared with multiple devices.
342 * All of this fits into the same 4Mbyte region, so it only
343 * requires one page table page. (or at least it used to -- paulus)
348 io_block_mapping(IMAP_ADDR, IMAP_ADDR, IMAP_SIZE, _PAGE_IO);
350 io_block_mapping(NVRAM_ADDR, NVRAM_ADDR, NVRAM_SIZE, _PAGE_IO);
351 io_block_mapping(MBX_CSR_ADDR, MBX_CSR_ADDR, MBX_CSR_SIZE, _PAGE_IO);
352 io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO);
354 /* Map some of the PCI/ISA I/O space to get the IDE interface.
356 io_block_mapping(PCI_ISA_IO_ADDR, PCI_ISA_IO_ADDR, 0x4000, _PAGE_IO);
357 io_block_mapping(PCI_IDE_ADDR, PCI_IDE_ADDR, 0x4000, _PAGE_IO);
359 #if defined(CONFIG_RPXLITE) || defined(CONFIG_RPXCLASSIC)
360 io_block_mapping(RPX_CSR_ADDR, RPX_CSR_ADDR, RPX_CSR_SIZE, _PAGE_IO);
361 #if !defined(CONFIG_PCI)
362 io_block_mapping(_IO_BASE,_IO_BASE,_IO_BASE_SIZE, _PAGE_IO);
365 #if defined(CONFIG_HTDMSOUND) || defined(CONFIG_RPXTOUCH) || defined(CONFIG_FB_RPX)
366 io_block_mapping(HIOX_CSR_ADDR, HIOX_CSR_ADDR, HIOX_CSR_SIZE, _PAGE_IO);
369 io_block_mapping(BCSR_ADDR, BCSR_ADDR, BCSR_SIZE, _PAGE_IO);
372 io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO);
374 #if defined(CONFIG_NETTA)
375 io_block_mapping(_IO_BASE,_IO_BASE,_IO_BASE_SIZE, _PAGE_IO);
380 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
381 unsigned long r6, unsigned long r7)
383 parse_bootinfo(find_bootinfo());
386 memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
389 m8xx_setup_pci_ptrs();
392 #ifdef CONFIG_BLK_DEV_INITRD
393 /* take care of initrd if we have one */
396 initrd_start = r4 + KERNELBASE;
397 initrd_end = r5 + KERNELBASE;
399 #endif /* CONFIG_BLK_DEV_INITRD */
400 /* take care of cmd line */
403 *(char *)(r7+KERNELBASE) = 0;
404 strcpy(cmd_line, (char *)(r6+KERNELBASE));
407 ppc_md.setup_arch = m8xx_setup_arch;
408 ppc_md.show_percpuinfo = m8xx_show_percpuinfo;
409 ppc_md.init_IRQ = m8xx_init_IRQ;
410 ppc_md.get_irq = m8xx_get_irq;
413 ppc_md.restart = m8xx_restart;
414 ppc_md.power_off = m8xx_power_off;
415 ppc_md.halt = m8xx_halt;
417 ppc_md.time_init = NULL;
418 ppc_md.set_rtc_time = m8xx_set_rtc_time;
419 ppc_md.get_rtc_time = m8xx_get_rtc_time;
420 ppc_md.calibrate_decr = m8xx_calibrate_decr;
422 ppc_md.find_end_of_memory = m8xx_find_end_of_memory;
423 ppc_md.setup_io_mappings = m8xx_map_io;
425 #if defined(CONFIG_BLK_DEV_MPC8xx_IDE)