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(uint cpm_page);
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))
75 cpm_page = (int) alloc_bootmem_pages(PAGE_SIZE);
77 /* Reset the Communication Processor Module.
79 m8xx_cpm_reset(cpm_page);
86 ROOT_DEV = Root_HDA1; /* hda1 */
89 #ifdef CONFIG_BLK_DEV_INITRD
91 ROOT_DEV = Root_FD0; /* floppy */
96 #if 0 /* XXX this may need to be updated for the new bootmem stuff,
97 or possibly just deleted (see set_phys_avail() in init.c).
99 /* initrd_start and size are setup by boot/head.S and kernel/head.S */
102 if (initrd_end > *memory_end_p)
104 printk("initrd extends beyond end of memory "
105 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
106 initrd_end,*memory_end_p);
121 machine_restart(NULL);
127 /* A place holder for time base interrupts, if they are ever enabled. */
128 irqreturn_t timebase_interrupt(int irq, void * dev, struct pt_regs * regs)
130 printk ("timebase_interrupt()\n");
135 static struct irqaction tbint_irqaction = {
136 .handler = timebase_interrupt,
137 .mask = CPU_MASK_NONE,
141 /* The decrementer counts at the system (internal) clock frequency divided by
142 * sixteen, or external oscillator divided by four. We force the processor
143 * to use system clock divided by sixteen.
145 void __init m8xx_calibrate_decr(void)
147 bd_t *binfo = (bd_t *)__res;
148 int freq, fp, divisor;
150 /* Unlock the SCCR. */
151 ((volatile immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk = ~KAPWR_KEY;
152 ((volatile immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk = KAPWR_KEY;
154 /* Force all 8xx processors to use divide by 16 processor clock. */
155 ((volatile immap_t *)IMAP_ADDR)->im_clkrst.car_sccr |= 0x02000000;
157 /* Processor frequency is MHz.
158 * The value 'fp' is the number of decrementer ticks per second.
160 fp = binfo->bi_intfreq / 16;
161 freq = fp*60; /* try to make freq/1e6 an integer */
163 printk("Decrementer Frequency = %d/%d\n", freq, divisor);
164 tb_ticks_per_jiffy = freq / HZ / divisor;
165 tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
167 /* Perform some more timer/timebase initialization. This used
168 * to be done elsewhere, but other changes caused it to get
169 * called more than once....that is a bad thing.
171 * First, unlock all of the registers we are going to modify.
172 * To protect them from corruption during power down, registers
173 * that are maintained by keep alive power are "locked". To
174 * modify these registers we have to write the key value to
175 * the key location associated with the register.
176 * Some boards power up with these unlocked, while others
177 * are locked. Writing anything (including the unlock code?)
178 * to the unlocked registers will lock them again. So, here
179 * we guarantee the registers are locked, then we unlock them
182 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk = ~KAPWR_KEY;
183 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck = ~KAPWR_KEY;
184 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk = ~KAPWR_KEY;
185 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk = KAPWR_KEY;
186 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck = KAPWR_KEY;
187 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk = KAPWR_KEY;
189 /* Disable the RTC one second and alarm interrupts. */
190 ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc &=
191 ~(RTCSC_SIE | RTCSC_ALE);
193 ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc |=
194 (RTCSC_RTF | RTCSC_RTE);
196 /* Enabling the decrementer also enables the timebase interrupts
197 * (or from the other point of view, to get decrementer interrupts
198 * we have to enable the timebase). The decrementer interrupt
199 * is wired into the vector table, nothing to do here for that.
201 ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_tbscr =
202 ((mk_int_int_mask(DEC_INTERRUPT) << 8) |
203 (TBSCR_TBF | TBSCR_TBE));
205 if (setup_irq(DEC_INTERRUPT, &tbint_irqaction))
206 panic("Could not allocate timer IRQ!");
208 #ifdef CONFIG_8xx_WDT
209 /* Install watchdog timer handler early because it might be
210 * already enabled by the bootloader
212 m8xx_wdt_handler_install(binfo);
216 /* The RTC on the MPC8xx is an internal register.
217 * We want to protect this during power down, so we need to unlock,
218 * modify, and re-lock.
221 m8xx_set_rtc_time(unsigned long time)
223 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck = KAPWR_KEY;
224 ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtc = time;
225 ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck = ~KAPWR_KEY;
230 m8xx_get_rtc_time(void)
232 /* Get time from the RTC. */
233 return((unsigned long)(((immap_t *)IMAP_ADDR)->im_sit.sit_rtc));
237 m8xx_restart(char *cmd)
239 __volatile__ unsigned char dummy;
242 ((immap_t *)IMAP_ADDR)->im_clkrst.car_plprcr |= 0x00000080;
244 /* Clear the ME bit in MSR to cause checkstop on machine check
246 mtmsr(mfmsr() & ~0x1000);
248 dummy = ((immap_t *)IMAP_ADDR)->im_clkrst.res[0];
249 printk("Restart failed\n");
267 m8xx_show_percpuinfo(struct seq_file *m, int i)
273 seq_printf(m, "clock\t\t: %ldMHz\n"
274 "bus clock\t: %ldMHz\n",
275 bp->bi_intfreq / 1000000,
276 bp->bi_busfreq / 1000000);
282 static struct irqaction mbx_i8259_irqaction = {
283 .handler = mbx_i8259_action,
284 .mask = CPU_MASK_NONE,
285 .name = "i8259 cascade",
289 /* Initialize the internal interrupt controller. The number of
290 * interrupts supported can vary with the processor type, and the
291 * 82xx family can have up to 64.
292 * External interrupts can be either edge or level triggered, and
293 * need to be initialized by the appropriate driver.
300 for (i = SIU_IRQ_OFFSET ; i < SIU_IRQ_OFFSET + NR_SIU_INTS ; i++)
301 irq_desc[i].handler = &ppc8xx_pic;
303 cpm_interrupt_init();
305 #if defined(CONFIG_PCI)
306 for (i = I8259_IRQ_OFFSET ; i < I8259_IRQ_OFFSET + NR_8259_INTS ; i++)
307 irq_desc[i].handler = &i8259_pic;
309 i8259_pic_irq_offset = I8259_IRQ_OFFSET;
312 /* The i8259 cascade interrupt must be level sensitive. */
313 ((immap_t *)IMAP_ADDR)->im_siu_conf.sc_siel &=
314 ~(0x80000000 >> ISA_BRIDGE_INT);
316 if (setup_irq(ISA_BRIDGE_INT, &mbx_i8259_irqaction))
317 enable_irq(ISA_BRIDGE_INT);
318 #endif /* CONFIG_PCI */
321 /* -------------------------------------------------------------------- */
324 * This is a big hack right now, but it may turn into something real
327 * For the 8xx boards (at this time anyway), there is nothing to initialize
328 * associated the PROM. Rather than include all of the prom.c
329 * functions in the image just to get prom_init, all we really need right
330 * now is the initialization of the physical memory region.
332 static unsigned long __init
333 m8xx_find_end_of_memory(void)
336 extern unsigned char __res[];
338 binfo = (bd_t *)__res;
340 return binfo->bi_memsize;
344 * Now map in some of the I/O space that is generically needed
345 * or shared with multiple devices.
346 * All of this fits into the same 4Mbyte region, so it only
347 * requires one page table page. (or at least it used to -- paulus)
352 io_block_mapping(IMAP_ADDR, IMAP_ADDR, IMAP_SIZE, _PAGE_IO);
354 io_block_mapping(NVRAM_ADDR, NVRAM_ADDR, NVRAM_SIZE, _PAGE_IO);
355 io_block_mapping(MBX_CSR_ADDR, MBX_CSR_ADDR, MBX_CSR_SIZE, _PAGE_IO);
356 io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO);
358 /* Map some of the PCI/ISA I/O space to get the IDE interface.
360 io_block_mapping(PCI_ISA_IO_ADDR, PCI_ISA_IO_ADDR, 0x4000, _PAGE_IO);
361 io_block_mapping(PCI_IDE_ADDR, PCI_IDE_ADDR, 0x4000, _PAGE_IO);
363 #if defined(CONFIG_RPXLITE) || defined(CONFIG_RPXCLASSIC)
364 io_block_mapping(RPX_CSR_ADDR, RPX_CSR_ADDR, RPX_CSR_SIZE, _PAGE_IO);
365 #if !defined(CONFIG_PCI)
366 io_block_mapping(_IO_BASE,_IO_BASE,_IO_BASE_SIZE, _PAGE_IO);
369 #if defined(CONFIG_HTDMSOUND) || defined(CONFIG_RPXTOUCH) || defined(CONFIG_FB_RPX)
370 io_block_mapping(HIOX_CSR_ADDR, HIOX_CSR_ADDR, HIOX_CSR_SIZE, _PAGE_IO);
373 io_block_mapping(BCSR_ADDR, BCSR_ADDR, BCSR_SIZE, _PAGE_IO);
376 io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO);
378 #if defined(CONFIG_NETTA)
379 io_block_mapping(_IO_BASE,_IO_BASE,_IO_BASE_SIZE, _PAGE_IO);
384 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
385 unsigned long r6, unsigned long r7)
387 parse_bootinfo(find_bootinfo());
390 memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
393 m8xx_setup_pci_ptrs();
396 #ifdef CONFIG_BLK_DEV_INITRD
397 /* take care of initrd if we have one */
400 initrd_start = r4 + KERNELBASE;
401 initrd_end = r5 + KERNELBASE;
403 #endif /* CONFIG_BLK_DEV_INITRD */
404 /* take care of cmd line */
407 *(char *)(r7+KERNELBASE) = 0;
408 strcpy(cmd_line, (char *)(r6+KERNELBASE));
411 ppc_md.setup_arch = m8xx_setup_arch;
412 ppc_md.show_percpuinfo = m8xx_show_percpuinfo;
413 ppc_md.irq_canonicalize = NULL;
414 ppc_md.init_IRQ = m8xx_init_IRQ;
415 ppc_md.get_irq = m8xx_get_irq;
418 ppc_md.restart = m8xx_restart;
419 ppc_md.power_off = m8xx_power_off;
420 ppc_md.halt = m8xx_halt;
422 ppc_md.time_init = NULL;
423 ppc_md.set_rtc_time = m8xx_set_rtc_time;
424 ppc_md.get_rtc_time = m8xx_get_rtc_time;
425 ppc_md.calibrate_decr = m8xx_calibrate_decr;
427 ppc_md.find_end_of_memory = m8xx_find_end_of_memory;
428 ppc_md.setup_io_mappings = m8xx_map_io;
430 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)