2 * arch/ppc/syslib/m8260_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.
11 #include <linux/config.h>
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
15 #include <linux/stddef.h>
16 #include <linux/slab.h>
17 #include <linux/init.h>
18 #include <linux/initrd.h>
19 #include <linux/root_dev.h>
20 #include <linux/seq_file.h>
21 #include <linux/irq.h>
25 #include <asm/pgtable.h>
26 #include <asm/mpc8260.h>
27 #include <asm/immap_cpm2.h>
28 #include <asm/machdep.h>
29 #include <asm/bootinfo.h>
34 unsigned char __res[sizeof(bd_t)];
36 extern void cpm2_reset(void);
37 extern void m8260_find_bridges(void);
38 extern void idma_pci9_init(void);
41 m8260_setup_arch(void)
43 /* Print out Vendor and Machine info. */
44 printk(KERN_INFO "%s %s port\n", CPUINFO_VENDOR, CPUINFO_MACHINE);
46 /* Reset the Communication Processor Module. */
48 #ifdef CONFIG_8260_PCI9
49 /* Initialise IDMA for PCI erratum workaround */
52 #ifdef CONFIG_PCI_8260
55 #ifdef CONFIG_BLK_DEV_INITRD
61 /* The decrementer counts at the system (internal) clock frequency
65 m8260_calibrate_decr(void)
67 bd_t *binfo = (bd_t *)__res;
70 freq = binfo->bi_busfreq;
72 tb_ticks_per_jiffy = freq / HZ / divisor;
73 tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
76 /* The 8260 has an internal 1-second timer update register that
77 * we should use for this purpose.
82 m8260_set_rtc_time(unsigned long time)
90 m8260_get_rtc_time(void)
92 /* Get time from the RTC.
94 return((unsigned long)rtc_time);
97 #ifndef BOOTROM_RESTART_ADDR
98 #warning "Using default BOOTROM_RESTART_ADDR!"
99 #define BOOTROM_RESTART_ADDR 0xff000104
103 m8260_restart(char *cmd)
105 extern void m8260_gorom(bd_t *bi, uint addr);
108 /* Most boot roms have a warmstart as the second instruction
109 * of the reset vector. If that doesn't work for you, change this
110 * or the reboot program to send a proper address.
112 startaddr = BOOTROM_RESTART_ADDR;
114 if (!strncmp(cmd, "startaddr=", 10))
115 startaddr = simple_strtoul(&cmd[10], NULL, 0);
118 m8260_gorom((void*)__pa(__res), startaddr);
129 m8260_power_off(void)
135 m8260_show_cpuinfo(struct seq_file *m)
137 bd_t *bp = (bd_t *)__res;
139 seq_printf(m, "vendor\t\t: %s\n"
142 "mem size\t\t: 0x%08x\n"
143 "console baud\t\t: %d\n"
145 "core clock\t: %u MHz\n"
146 "CPM clock\t: %u MHz\n"
147 "bus clock\t: %u MHz\n",
148 CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize,
149 bp->bi_baudrate, bp->bi_intfreq / 1000000,
150 bp->bi_cpmfreq / 1000000, 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.
165 for ( i = 0 ; i < NR_SIU_INTS ; i++ )
166 irq_desc[i].handler = &cpm2_pic;
168 /* Initialize the default interrupt mapping priorities,
169 * in case the boot rom changed something on us.
171 cpm2_immr->im_intctl.ic_sicr = 0;
172 cpm2_immr->im_intctl.ic_siprr = 0x05309770;
173 cpm2_immr->im_intctl.ic_scprrh = 0x05309770;
174 cpm2_immr->im_intctl.ic_scprrl = 0x05309770;
180 static unsigned long __init
181 m8260_find_end_of_memory(void)
183 bd_t *binfo = (bd_t *)__res;
185 return binfo->bi_memsize;
188 /* Map the IMMR, plus anything else we can cover
189 * in that upper space according to the memory controller
190 * chip select mapping. Grab another bunch of space
191 * below that for stuff we can't cover in the upper.
198 /* Map IMMR region to a 256MB BAT */
199 addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR;
200 io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);
202 /* Map I/O region to a 256MB BAT */
203 io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO);
206 /* Place-holder for board-specific init */
207 void __attribute__ ((weak)) __init
208 m82xx_board_init(void)
213 * r3 - Optional pointer to a board information structure.
214 * r4 - Optional pointer to the physical starting address of the init RAM
216 * r5 - Optional pointer to the physical ending address of the init RAM
218 * r6 - Optional pointer to the physical starting address of any kernel
219 * command-line parameters.
220 * r7 - Optional pointer to the physical ending address of any kernel
221 * command-line parameters.
224 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
225 unsigned long r6, unsigned long r7)
227 parse_bootinfo(find_bootinfo());
230 memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
232 #ifdef CONFIG_BLK_DEV_INITRD
233 /* take care of initrd if we have one */
235 initrd_start = r4 + KERNELBASE;
236 initrd_end = r5 + KERNELBASE;
238 #endif /* CONFIG_BLK_DEV_INITRD */
239 /* take care of cmd line */
241 *(char *)(r7+KERNELBASE) = 0;
242 strcpy(cmd_line, (char *)(r6+KERNELBASE));
245 ppc_md.setup_arch = m8260_setup_arch;
246 ppc_md.show_cpuinfo = m8260_show_cpuinfo;
247 ppc_md.init_IRQ = m8260_init_IRQ;
248 ppc_md.get_irq = cpm2_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.set_rtc_time = m8260_set_rtc_time;
255 ppc_md.get_rtc_time = m8260_get_rtc_time;
256 ppc_md.calibrate_decr = m8260_calibrate_decr;
258 ppc_md.find_end_of_memory = m8260_find_end_of_memory;
259 ppc_md.setup_io_mappings = m8260_map_io;
261 /* Call back for board-specific settings and overrides. */