summaryrefslogtreecommitdiffstats
path: root/arch/ppc/syslib/m8260_setup.c
blob: 15f0d7323535f400b81603dd21f1bc00f2ecc50e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
/*
 *  Copyright (C) 1995  Linus Torvalds
 *  Adapted from 'alpha' version by Gary Thomas
 *  Modified by Cort Dougan (cort@cs.nmt.edu)
 *  Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net)
 *  Further modified for generic 8xx and 8260 by Dan.
 */

#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/root_dev.h>
#include <linux/seq_file.h>
#include <linux/irq.h>

#include <asm/mmu.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/mpc8260.h>
#include <asm/cpm2.h>
#include <asm/machdep.h>
#include <asm/bootinfo.h>
#include <asm/time.h>

#include "cpm2_pic.h"

unsigned char __res[sizeof(bd_t)];

extern void pq2_find_bridges(void);
extern void pq2pci_init_irq(void);
extern void idma_pci9_init(void);

/* Place-holder for board-specific init */
void __attribute__ ((weak)) __init
m82xx_board_setup(void)
{
}

static void __init
m8260_setup_arch(void)
{
	/* Print out Vendor and Machine info. */
	printk(KERN_INFO "%s %s port\n", CPUINFO_VENDOR, CPUINFO_MACHINE);

	/* Reset the Communication Processor Module. */
	cpm2_reset();
#ifdef CONFIG_8260_PCI9
	/* Initialise IDMA for PCI erratum workaround */
	idma_pci9_init();
#endif
#ifdef CONFIG_PCI_8260
	pq2_find_bridges();
#endif
#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start)
		ROOT_DEV = Root_RAM0;
#endif

	identify_ppc_sys_by_name_and_id(BOARD_CHIP_NAME,
				in_be32(CPM_MAP_ADDR + CPM_IMMR_OFFSET));

	m82xx_board_setup();
}

/* The decrementer counts at the system (internal) clock frequency
 * divided by four.
 */
static void __init
m8260_calibrate_decr(void)
{
	bd_t *binfo = (bd_t *)__res;
	int freq, divisor;

	freq = binfo->bi_busfreq;
        divisor = 4;
        tb_ticks_per_jiffy = freq / HZ / divisor;
	tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
}

/* The 8260 has an internal 1-second timer update register that
 * we should use for this purpose.
 */
static uint rtc_time;

static int
m8260_set_rtc_time(unsigned long time)
{
	rtc_time = time;

	return(0);
}

static unsigned long
m8260_get_rtc_time(void)
{
	/* Get time from the RTC.
	*/
	return((unsigned long)rtc_time);
}

#ifndef BOOTROM_RESTART_ADDR
#warning "Using default BOOTROM_RESTART_ADDR!"
#define BOOTROM_RESTART_ADDR	0xff000104
#endif

static void
m8260_restart(char *cmd)
{
	extern void m8260_gorom(bd_t *bi, uint addr);
	uint	startaddr;

	/* Most boot roms have a warmstart as the second instruction
	 * of the reset vector.  If that doesn't work for you, change this
	 * or the reboot program to send a proper address.
	 */
	startaddr = BOOTROM_RESTART_ADDR;
	if (cmd != NULL) {
		if (!strncmp(cmd, "startaddr=", 10))
			startaddr = simple_strtoul(&cmd[10], NULL, 0);
	}

	m8260_gorom((void*)__pa(__res), startaddr);
}

static void
m8260_halt(void)
{
	local_irq_disable();
	while (1);
}

static void
m8260_power_off(void)
{
	m8260_halt();
}

static int
m8260_show_cpuinfo(struct seq_file *m)
{
	bd_t *bp = (bd_t *)__res;

	seq_printf(m, "vendor\t\t: %s\n"
		   "machine\t\t: %s\n"
		   "\n"
		   "mem size\t\t: 0x%08x\n"
		   "console baud\t\t: %d\n"
		   "\n"
		   "core clock\t: %u MHz\n"
		   "CPM  clock\t: %u MHz\n"
		   "bus  clock\t: %u MHz\n",
		   CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize,
		   bp->bi_baudrate, bp->bi_intfreq / 1000000,
		   bp->bi_cpmfreq / 1000000, bp->bi_busfreq / 1000000);
	return 0;
}

/* Initialize the internal interrupt controller.  The number of
 * interrupts supported can vary with the processor type, and the
 * 8260 family can have up to 64.
 * External interrupts can be either edge or level triggered, and
 * need to be initialized by the appropriate driver.
 */
static void __init
m8260_init_IRQ(void)
{
	cpm2_init_IRQ();

	/* Initialize the default interrupt mapping priorities,
	 * in case the boot rom changed something on us.
	 */
	cpm2_immr->im_intctl.ic_siprr = 0x05309770;

#if defined(CONFIG_PCI) && (defined(CONFIG_ADS8272) || defined(CONFIG_PQ2FADS))
 	/* Initialize stuff for the 82xx CPLD IC and install demux  */
 	pq2pci_init_irq();
#endif

}

/*
 * Same hack as 8xx
 */
static unsigned long __init
m8260_find_end_of_memory(void)
{
	bd_t *binfo = (bd_t *)__res;

	return binfo->bi_memsize;
}

/* Map the IMMR, plus anything else we can cover
 * in that upper space according to the memory controller
 * chip select mapping.  Grab another bunch of space
 * below that for stuff we can't cover in the upper.
 */
static void __init
m8260_map_io(void)
{
	uint addr;

	/* Map IMMR region to a 256MB BAT */
	addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR;
	io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);

	/* Map I/O region to a 256MB BAT */
	io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO);
}

/* Place-holder for board-specific ppc_md hooking */
void __attribute__ ((weak)) __init
m82xx_board_init(void)
{
}

/* Inputs:
 *   r3 - Optional pointer to a board information structure.
 *   r4 - Optional pointer to the physical starting address of the init RAM
 *        disk.
 *   r5 - Optional pointer to the physical ending address of the init RAM
 *        disk.
 *   r6 - Optional pointer to the physical starting address of any kernel
 *        command-line parameters.
 *   r7 - Optional pointer to the physical ending address of any kernel
 *        command-line parameters.
 */
void __init
platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
	      unsigned long r6, unsigned long r7)
{
	parse_bootinfo(find_bootinfo());

	if ( r3 )
		memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );

#ifdef CONFIG_BLK_DEV_INITRD
	/* take care of initrd if we have one */
	if ( r4 ) {
		initrd_start = r4 + KERNELBASE;
		initrd_end = r5 + KERNELBASE;
	}
#endif /* CONFIG_BLK_DEV_INITRD */
	/* take care of cmd line */
	if ( r6 ) {
		*(char *)(r7+KERNELBASE) = 0;
		strcpy(cmd_line, (char *)(r6+KERNELBASE));
	}

	ppc_md.setup_arch		= m8260_setup_arch;
	ppc_md.show_cpuinfo		= m8260_show_cpuinfo;
	ppc_md.init_IRQ			= m8260_init_IRQ;
	ppc_md.get_irq			= cpm2_get_irq;

	ppc_md.restart			= m8260_restart;
	ppc_md.power_off		= m8260_power_off;
	ppc_md.halt			= m8260_halt;

	ppc_md.set_rtc_time		= m8260_set_rtc_time;
	ppc_md.get_rtc_time		= m8260_get_rtc_time;
	ppc_md.calibrate_decr		= m8260_calibrate_decr;

	ppc_md.find_end_of_memory	= m8260_find_end_of_memory;
	ppc_md.setup_io_mappings	= m8260_map_io;

	/* Call back for board-specific settings and overrides. */
	m82xx_board_init();
}
OpenPOWER on IntegriCloud