tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 1995 Linus Torvalds
3 * Adapted from 'alpha' version by Gary Thomas
4 * Modified by Cort Dougan (cort@cs.nmt.edu)
5 * Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net)
6 * Further modified for generic 8xx and 8260 by Dan.
7 */
8
9#include <linux/sched.h>
10#include <linux/kernel.h>
11#include <linux/mm.h>
12#include <linux/stddef.h>
13#include <linux/slab.h>
14#include <linux/init.h>
15#include <linux/initrd.h>
16#include <linux/root_dev.h>
17#include <linux/seq_file.h>
18#include <linux/irq.h>
19
20#include <asm/mmu.h>
21#include <asm/io.h>
22#include <asm/pgtable.h>
23#include <asm/mpc8260.h>
24#include <asm/cpm2.h>
25#include <asm/machdep.h>
26#include <asm/bootinfo.h>
27#include <asm/time.h>
28#include <asm/ppc_sys.h>
29
30#include "cpm2_pic.h"
31
32unsigned char __res[sizeof(bd_t)];
33
34extern void pq2_find_bridges(void);
35extern void pq2pci_init_irq(void);
36extern void idma_pci9_init(void);
37
38/* Place-holder for board-specific init */
39void __attribute__ ((weak)) __init
40m82xx_board_setup(void)
41{
42}
43
44static void __init
45m8260_setup_arch(void)
46{
47 /* Print out Vendor and Machine info. */
48 printk(KERN_INFO "%s %s port\n", CPUINFO_VENDOR, CPUINFO_MACHINE);
49
50 /* Reset the Communication Processor Module. */
51 cpm2_reset();
52#ifdef CONFIG_8260_PCI9
53 /* Initialise IDMA for PCI erratum workaround */
54 idma_pci9_init();
55#endif
56#ifdef CONFIG_PCI_8260
57 pq2_find_bridges();
58#endif
59#ifdef CONFIG_BLK_DEV_INITRD
60 if (initrd_start)
61 ROOT_DEV = Root_RAM0;
62#endif
63
64 identify_ppc_sys_by_name_and_id(BOARD_CHIP_NAME,
65 in_be32((void *)CPM_MAP_ADDR + CPM_IMMR_OFFSET));
66
67 m82xx_board_setup();
68}
69
70/* The decrementer counts at the system (internal) clock frequency
71 * divided by four.
72 */
73static void __init
74m8260_calibrate_decr(void)
75{
76 bd_t *binfo = (bd_t *)__res;
77 int freq, divisor;
78
79 freq = binfo->bi_busfreq;
80 divisor = 4;
81 tb_ticks_per_jiffy = freq / HZ / divisor;
82 tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
83}
84
85/* The 8260 has an internal 1-second timer update register that
86 * we should use for this purpose.
87 */
88static uint rtc_time;
89
90static int
91m8260_set_rtc_time(unsigned long time)
92{
93 rtc_time = time;
94
95 return(0);
96}
97
98static unsigned long
99m8260_get_rtc_time(void)
100{
101 /* Get time from the RTC.
102 */
103 return((unsigned long)rtc_time);
104}
105
106#ifndef BOOTROM_RESTART_ADDR
107#warning "Using default BOOTROM_RESTART_ADDR!"
108#define BOOTROM_RESTART_ADDR 0xff000104
109#endif
110
111static void
112m8260_restart(char *cmd)
113{
114 extern void m8260_gorom(bd_t *bi, uint addr);
115 uint startaddr;
116
117 /* Most boot roms have a warmstart as the second instruction
118 * of the reset vector. If that doesn't work for you, change this
119 * or the reboot program to send a proper address.
120 */
121 startaddr = BOOTROM_RESTART_ADDR;
122 if (cmd != NULL) {
123 if (!strncmp(cmd, "startaddr=", 10))
124 startaddr = simple_strtoul(&cmd[10], NULL, 0);
125 }
126
127 m8260_gorom((void*)__pa(__res), startaddr);
128}
129
130static void
131m8260_halt(void)
132{
133 local_irq_disable();
134 while (1);
135}
136
137static void
138m8260_power_off(void)
139{
140 m8260_halt();
141}
142
143static int
144m8260_show_cpuinfo(struct seq_file *m)
145{
146 bd_t *bp = (bd_t *)__res;
147
148 seq_printf(m, "vendor\t\t: %s\n"
149 "machine\t\t: %s\n"
150 "\n"
151 "mem size\t\t: 0x%08lx\n"
152 "console baud\t\t: %ld\n"
153 "\n"
154 "core clock\t: %lu MHz\n"
155 "CPM clock\t: %lu MHz\n"
156 "bus clock\t: %lu MHz\n",
157 CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize,
158 bp->bi_baudrate, bp->bi_intfreq / 1000000,
159 bp->bi_cpmfreq / 1000000, bp->bi_busfreq / 1000000);
160 return 0;
161}
162
163/* Initialize the internal interrupt controller. The number of
164 * interrupts supported can vary with the processor type, and the
165 * 8260 family can have up to 64.
166 * External interrupts can be either edge or level triggered, and
167 * need to be initialized by the appropriate driver.
168 */
169static void __init
170m8260_init_IRQ(void)
171{
172 cpm2_init_IRQ();
173
174 /* Initialize the default interrupt mapping priorities,
175 * in case the boot rom changed something on us.
176 */
177 cpm2_immr->im_intctl.ic_siprr = 0x05309770;
178}
179
180/*
181 * Same hack as 8xx
182 */
183static unsigned long __init
184m8260_find_end_of_memory(void)
185{
186 bd_t *binfo = (bd_t *)__res;
187
188 return binfo->bi_memsize;
189}
190
191/* Map the IMMR, plus anything else we can cover
192 * in that upper space according to the memory controller
193 * chip select mapping. Grab another bunch of space
194 * below that for stuff we can't cover in the upper.
195 */
196static void __init
197m8260_map_io(void)
198{
199 uint addr;
200
201 /* Map IMMR region to a 256MB BAT */
202 addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR;
203 io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);
204
205 /* Map I/O region to a 256MB BAT */
206 io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO);
207}
208
209/* Place-holder for board-specific ppc_md hooking */
210void __attribute__ ((weak)) __init
211m82xx_board_init(void)
212{
213}
214
215/* Inputs:
216 * r3 - Optional pointer to a board information structure.
217 * r4 - Optional pointer to the physical starting address of the init RAM
218 * disk.
219 * r5 - Optional pointer to the physical ending address of the init RAM
220 * disk.
221 * r6 - Optional pointer to the physical starting address of any kernel
222 * command-line parameters.
223 * r7 - Optional pointer to the physical ending address of any kernel
224 * command-line parameters.
225 */
226void __init
227platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
228 unsigned long r6, unsigned long r7)
229{
230 parse_bootinfo(find_bootinfo());
231
232 if ( r3 )
233 memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
234
235#ifdef CONFIG_BLK_DEV_INITRD
236 /* take care of initrd if we have one */
237 if ( r4 ) {
238 initrd_start = r4 + KERNELBASE;
239 initrd_end = r5 + KERNELBASE;
240 }
241#endif /* CONFIG_BLK_DEV_INITRD */
242 /* take care of cmd line */
243 if ( r6 ) {
244 *(char *)(r7+KERNELBASE) = 0;
245 strcpy(cmd_line, (char *)(r6+KERNELBASE));
246 }
247
248 ppc_md.setup_arch = m8260_setup_arch;
249 ppc_md.show_cpuinfo = m8260_show_cpuinfo;
250 ppc_md.init_IRQ = m8260_init_IRQ;
251 ppc_md.get_irq = cpm2_get_irq;
252
253 ppc_md.restart = m8260_restart;
254 ppc_md.power_off = m8260_power_off;
255 ppc_md.halt = m8260_halt;
256
257 ppc_md.set_rtc_time = m8260_set_rtc_time;
258 ppc_md.get_rtc_time = m8260_get_rtc_time;
259 ppc_md.calibrate_decr = m8260_calibrate_decr;
260
261 ppc_md.find_end_of_memory = m8260_find_end_of_memory;
262 ppc_md.setup_io_mappings = m8260_map_io;
263
264 /* Call back for board-specific settings and overrides. */
265 m82xx_board_init();
266}