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 and 8260 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/ide.h>
34 #include <linux/seq_file.h>
37 #include <asm/residual.h>
39 #include <asm/pgtable.h>
41 #include <asm/mpc8260.h>
42 #include <asm/immap_8260.h>
43 #include <asm/machdep.h>
44 #include <asm/bootinfo.h>
47 #include "ppc8260_pic.h"
49 static int m8260_set_rtc_time(unsigned long time);
50 static unsigned long m8260_get_rtc_time(void);
51 static void m8260_calibrate_decr(void);
53 unsigned char __res[sizeof(bd_t)];
55 extern void m8260_cpm_reset(void);
58 m8260_setup_arch(void)
60 /* Reset the Communication Processor Module.
65 /* The decrementer counts at the system (internal) clock frequency
69 m8260_calibrate_decr(void)
71 bd_t *binfo = (bd_t *)__res;
74 freq = binfo->bi_busfreq;
76 tb_ticks_per_jiffy = freq / HZ / divisor;
77 tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
80 /* The 8260 has an internal 1-second timer update register that
81 * we should use for this purpose.
86 m8260_set_rtc_time(unsigned long time)
94 m8260_get_rtc_time(void)
96 /* Get time from the RTC.
98 return((unsigned long)rtc_time);
101 #ifndef BOOTROM_RESTART_ADDR
102 #warning "Using default BOOTROM_RESTART_ADDR!"
103 #define BOOTROM_RESTART_ADDR 0xff000104
107 m8260_restart(char *cmd)
109 extern void m8260_gorom(bd_t *bi, uint addr);
112 /* Most boot roms have a warmstart as the second instruction
113 * of the reset vector. If that doesn't work for you, change this
114 * or the reboot program to send a proper address.
116 startaddr = BOOTROM_RESTART_ADDR;
118 if (!strncmp(cmd, "startaddr=", 10))
119 startaddr = simple_strtoul(&cmd[10], NULL, 0);
122 m8260_gorom((void*)__pa(__res), startaddr);
133 m8260_power_off(void)
139 m8260_show_percpuinfo(struct seq_file *m, int i)
145 seq_printf(m, "core clock\t: %d MHz\n"
146 "CPM clock\t: %d MHz\n"
147 "bus clock\t: %d MHz\n",
148 bp->bi_intfreq / 1000000,
149 bp->bi_cpmfreq / 1000000,
150 bp->bi_busfreq / 1000000);
154 /* Initialize the internal interrupt controller. The number of
155 * interrupts supported can vary with the processor type, and the
156 * 8260 family can have up to 64.
157 * External interrupts can be either edge or level triggered, and
158 * need to be initialized by the appropriate driver.
164 void cpm_interrupt_init(void);
166 for ( i = 0 ; i < NR_SIU_INTS ; i++ )
167 irq_desc[i].handler = &ppc8260_pic;
169 /* Initialize the default interrupt mapping priorities,
170 * in case the boot rom changed something on us.
172 immr->im_intctl.ic_sicr = 0;
173 immr->im_intctl.ic_siprr = 0x05309770;
174 immr->im_intctl.ic_scprrh = 0x05309770;
175 immr->im_intctl.ic_scprrl = 0x05309770;
181 static unsigned long __init
182 m8260_find_end_of_memory(void)
185 extern unsigned char __res[];
187 binfo = (bd_t *)__res;
189 return binfo->bi_memsize;
192 /* Map the IMMR, plus anything else we can cover
193 * in that upper space according to the memory controller
194 * chip select mapping. Grab another bunch of space
195 * below that for stuff we can't cover in the upper.
202 /* Map IMMR region to a 256MB BAT */
203 addr = (immr != NULL) ? (uint)immr : IMAP_ADDR;
204 io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);
206 /* Map I/O region to a 256MB BAT */
207 io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO);
211 * r3 - Optional pointer to a board information structure.
212 * r4 - Optional pointer to the physical starting address of the init RAM
214 * r5 - Optional pointer to the physical ending address of the init RAM
216 * r6 - Optional pointer to the physical starting address of any kernel
217 * command-line parameters.
218 * r7 - Optional pointer to the physical ending address of any kernel
219 * command-line parameters.
222 m8260_init(unsigned long r3, unsigned long r4, unsigned long r5,
223 unsigned long r6, unsigned long r7)
225 parse_bootinfo(find_bootinfo());
228 memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
230 #ifdef CONFIG_BLK_DEV_INITRD
231 /* take care of initrd if we have one */
233 initrd_start = r4 + KERNELBASE;
234 initrd_end = r5 + KERNELBASE;
236 #endif /* CONFIG_BLK_DEV_INITRD */
237 /* take care of cmd line */
239 *(char *)(r7+KERNELBASE) = 0;
240 strcpy(cmd_line, (char *)(r6+KERNELBASE));
243 ppc_md.setup_arch = m8260_setup_arch;
244 ppc_md.show_percpuinfo = m8260_show_percpuinfo;
245 ppc_md.irq_canonicalize = NULL;
246 ppc_md.init_IRQ = m8260_init_IRQ;
247 ppc_md.get_irq = m8260_get_irq;
250 ppc_md.restart = m8260_restart;
251 ppc_md.power_off = m8260_power_off;
252 ppc_md.halt = m8260_halt;
254 ppc_md.time_init = NULL;
255 ppc_md.set_rtc_time = m8260_set_rtc_time;
256 ppc_md.get_rtc_time = m8260_get_rtc_time;
257 ppc_md.calibrate_decr = m8260_calibrate_decr;
259 ppc_md.find_end_of_memory = m8260_find_end_of_memory;
260 ppc_md.setup_io_mappings = m8260_map_io;