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
29#include "cpm2_pic.h"
30
31unsigned char __res[sizeof(bd_t)];
32
33extern void pq2_find_bridges(void);
34extern void pq2pci_init_irq(void);
35extern void idma_pci9_init(void);
36
37/* Place-holder for board-specific init */
38void __attribute__ ((weak)) __init
39m82xx_board_setup(void)
40{
41}
42
43static void __init
44m8260_setup_arch(void)
45{
46	/* Print out Vendor and Machine info. */
47	printk(KERN_INFO "%s %s port\n", CPUINFO_VENDOR, CPUINFO_MACHINE);
48
49	/* Reset the Communication Processor Module. */
50	cpm2_reset();
51#ifdef CONFIG_8260_PCI9
52	idma_pci9_init();
53#endif
54#ifdef CONFIG_PCI_8260
55	pq2_find_bridges();
56#endif
57#ifdef CONFIG_BLK_DEV_INITRD
58	if (initrd_start)
59		ROOT_DEV = Root_RAM0;
60#endif
61
62	identify_ppc_sys_by_name_and_id(BOARD_CHIP_NAME,
63				in_be32(CPM_MAP_ADDR + CPM_IMMR_OFFSET));
64
65	m82xx_board_setup();
66}
67
68/* The decrementer counts at the system (internal) clock frequency
69 * divided by four.
70 */
71static void __init
72m8260_calibrate_decr(void)
73{
74	bd_t *binfo = (bd_t *)__res;
75	int freq, divisor;
76
77	freq = binfo->bi_busfreq;
78        divisor = 4;
79        tb_ticks_per_jiffy = freq / HZ / divisor;
80	tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
81}
82
83/* The 8260 has an internal 1-second timer update register that
84 * we should use for this purpose.
85 */
86static uint rtc_time;
87
88static int
89m8260_set_rtc_time(unsigned long time)
90{
91	rtc_time = time;
92
93	return(0);
94}
95
96static unsigned long
97m8260_get_rtc_time(void)
98{
99	/* Get time from the RTC.
100	*/
101	return((unsigned long)rtc_time);
102}
103
104#ifndef BOOTROM_RESTART_ADDR
105#warning "Using default BOOTROM_RESTART_ADDR!"
106#define BOOTROM_RESTART_ADDR	0xff000104
107#endif
108
109static void
110m8260_restart(char *cmd)
111{
112	extern void m8260_gorom(bd_t *bi, uint addr);
113	uint	startaddr;
114
115	/* Most boot roms have a warmstart as the second instruction
116	 * of the reset vector.  If that doesn't work for you, change this
117	 * or the reboot program to send a proper address.
118	 */
119	startaddr = BOOTROM_RESTART_ADDR;
120	if (cmd != NULL) {
121		if (!strncmp(cmd, "startaddr=", 10))
122			startaddr = simple_strtoul(&cmd[10], NULL, 0);
123	}
124
125	m8260_gorom((void*)__pa(__res), startaddr);
126}
127
128static void
129m8260_halt(void)
130{
131	local_irq_disable();
132	while (1);
133}
134
135static void
136m8260_power_off(void)
137{
138	m8260_halt();
139}
140
141static int
142m8260_show_cpuinfo(struct seq_file *m)
143{
144	bd_t *bp = (bd_t *)__res;
145
146	seq_printf(m, "vendor\t\t: %s\n"
147		   "machine\t\t: %s\n"
148		   "\n"
149		   "mem size\t\t: 0x%08x\n"
150		   "console baud\t\t: %d\n"
151		   "\n"
152		   "core clock\t: %u MHz\n"
153		   "CPM  clock\t: %u MHz\n"
154		   "bus  clock\t: %u MHz\n",
155		   CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize,
156		   bp->bi_baudrate, bp->bi_intfreq / 1000000,
157		   bp->bi_cpmfreq / 1000000, bp->bi_busfreq / 1000000);
158	return 0;
159}
160
161/* Initialize the internal interrupt controller.  The number of
162 * interrupts supported can vary with the processor type, and the
163 * 8260 family can have up to 64.
164 * External interrupts can be either edge or level triggered, and
165 * need to be initialized by the appropriate driver.
166 */
167static void __init
168m8260_init_IRQ(void)
169{
170	cpm2_init_IRQ();
171
172	/* Initialize the default interrupt mapping priorities,
173	 * in case the boot rom changed something on us.
174	 */
175	cpm2_immr->im_intctl.ic_siprr = 0x05309770;
176
177#if defined(CONFIG_PCI) && (defined(CONFIG_ADS8272) || defined(CONFIG_PQ2FADS))
178 	/* Initialize stuff for the 82xx CPLD IC and install demux  */
179 	pq2pci_init_irq();
180#endif
181
182}
183
184/*
185 * Same hack as 8xx
186 */
187static unsigned long __init
188m8260_find_end_of_memory(void)
189{
190	bd_t *binfo = (bd_t *)__res;
191
192	return binfo->bi_memsize;
193}
194
195/* Map the IMMR, plus anything else we can cover
196 * in that upper space according to the memory controller
197 * chip select mapping.  Grab another bunch of space
198 * below that for stuff we can't cover in the upper.
199 */
200static void __init
201m8260_map_io(void)
202{
203	uint addr;
204
205	/* Map IMMR region to a 256MB BAT */
206	addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR;
207	io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);
208
209	/* Map I/O region to a 256MB BAT */
210	io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO);
211}
212
213/* Place-holder for board-specific ppc_md hooking */
214void __attribute__ ((weak)) __init
215m82xx_board_init(void)
216{
217}
218
219/* Inputs:
220 *   r3 - Optional pointer to a board information structure.
221 *   r4 - Optional pointer to the physical starting address of the init RAM
222 *        disk.
223 *   r5 - Optional pointer to the physical ending address of the init RAM
224 *        disk.
225 *   r6 - Optional pointer to the physical starting address of any kernel
226 *        command-line parameters.
227 *   r7 - Optional pointer to the physical ending address of any kernel
228 *        command-line parameters.
229 */
230void __init
231platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
232	      unsigned long r6, unsigned long r7)
233{
234	parse_bootinfo(find_bootinfo());
235
236	if ( r3 )
237		memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
238
239#ifdef CONFIG_BLK_DEV_INITRD
240	/* take care of initrd if we have one */
241	if ( r4 ) {
242		initrd_start = r4 + KERNELBASE;
243		initrd_end = r5 + KERNELBASE;
244	}
245#endif /* CONFIG_BLK_DEV_INITRD */
246	/* take care of cmd line */
247	if ( r6 ) {
248		*(char *)(r7+KERNELBASE) = 0;
249		strcpy(cmd_line, (char *)(r6+KERNELBASE));
250	}
251
252	ppc_md.setup_arch		= m8260_setup_arch;
253	ppc_md.show_cpuinfo		= m8260_show_cpuinfo;
254	ppc_md.init_IRQ			= m8260_init_IRQ;
255	ppc_md.get_irq			= cpm2_get_irq;
256
257	ppc_md.restart			= m8260_restart;
258	ppc_md.power_off		= m8260_power_off;
259	ppc_md.halt			= m8260_halt;
260
261	ppc_md.set_rtc_time		= m8260_set_rtc_time;
262	ppc_md.get_rtc_time		= m8260_get_rtc_time;
263	ppc_md.calibrate_decr		= m8260_calibrate_decr;
264
265	ppc_md.find_end_of_memory	= m8260_find_end_of_memory;
266	ppc_md.setup_io_mappings	= m8260_map_io;
267
268	/* Call back for board-specific settings and overrides. */
269	m82xx_board_init();
270}
271