aboutsummaryrefslogtreecommitdiff
path: root/arch/ppc/boot/simple/misc-prep.c
blob: 63def9d13d701347f0513c9bac3dc2efb55a447a (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
/*
 * Maintainer: Tom Rini <trini@kernel.crashing.org>
 *
 * In the past: Gary Thomas, Cort Dougan <cort@cs.nmt.edu>
 */

#include <linux/config.h>
#include <linux/pci_ids.h>
#include <linux/types.h>
#include <asm/residual.h>
#include <asm/string.h>
#include <asm/byteorder.h>
#include "mpc10x.h"
#include "of1275.h"
#include "nonstdio.h"

extern int keyb_present;	/* keyboard controller is present by default */
RESIDUAL hold_resid_buf;
RESIDUAL *hold_residual = &hold_resid_buf;
static void *OFW_interface;	/* Pointer to OF, if available. */

#ifdef CONFIG_VGA_CONSOLE
char *vidmem = (char *)0xC00B8000;
int lines = 25, cols = 80;
int orig_x, orig_y = 24;
#endif /* CONFIG_VGA_CONSOLE */

extern int CRT_tstc(void);
extern int vga_init(unsigned char *ISA_mem);
extern void gunzip(void *, int, unsigned char *, int *);
extern unsigned long serial_init(int chan, void *ignored);
extern void serial_fixups(void);
extern struct bi_record *decompress_kernel(unsigned long load_addr,
		int num_words, unsigned long cksum);
extern void disable_6xx_mmu(void);
extern unsigned long mpc10x_get_mem_size(void);

static void
writel(unsigned int val, unsigned int address)
{
	/* Ensure I/O operations complete */
	__asm__ volatile("eieio");
	*(unsigned int *)address = cpu_to_le32(val);
}

#define PCI_CFG_ADDR(dev,off)	((0x80<<24) | (dev<<8) | (off&0xfc))
#define PCI_CFG_DATA(off)	(MPC10X_MAPA_CNFG_DATA+(off&3))

static void
pci_read_config_32(unsigned char devfn,
		unsigned char offset,
		unsigned int *val)
{
	/* Ensure I/O operations complete */
	__asm__ volatile("eieio");
	*(unsigned int *)PCI_CFG_ADDR(devfn,offset) =
		cpu_to_le32(MPC10X_MAPA_CNFG_ADDR);
	/* Ensure I/O operations complete */
	__asm__ volatile("eieio");
	*val = le32_to_cpu(*(unsigned int *)PCI_CFG_DATA(offset));
	return;
}

#ifdef CONFIG_VGA_CONSOLE
void
scroll(void)
{
	int i;

	memcpy ( vidmem, vidmem + cols * 2, ( lines - 1 ) * cols * 2 );
	for ( i = ( lines - 1 ) * cols * 2; i < lines * cols * 2; i += 2 )
		vidmem[i] = ' ';
}
#endif /* CONFIG_VGA_CONSOLE */

unsigned long
load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
		  RESIDUAL *residual, void *OFW)
{
	int start_multi = 0;
	unsigned int pci_viddid, pci_did, tulip_pci_base, tulip_base;

	/* If we have Open Firmware, initialise it immediately */
	if (OFW) {
		OFW_interface = OFW;
		ofinit(OFW_interface);
	}

	board_isa_init();
#if defined(CONFIG_VGA_CONSOLE)
	vga_init((unsigned char *)0xC0000000);
#endif /* CONFIG_VGA_CONSOLE */

	if (residual) {
		/* Is this Motorola PPCBug? */
		if ((1 & residual->VitalProductData.FirmwareSupports) &&
		    (1 == residual->VitalProductData.FirmwareSupplier)) {
			unsigned char base_mod;
			unsigned char board_type = inb(0x801) & 0xF0;

			/*
			 * Reset the onboard 21x4x Ethernet
			 * Motorola Ethernet is at IDSEL 14 (devfn 0x70)
			 */
			pci_read_config_32(0x70, 0x00, &pci_viddid);
			pci_did = (pci_viddid & 0xffff0000) >> 16;
			/* Be sure we've really found a 21x4x chip */
			if (((pci_viddid & 0xffff) == PCI_VENDOR_ID_DEC) &&
				((pci_did == PCI_DEVICE_ID_DEC_TULIP_FAST) ||
				(pci_did == PCI_DEVICE_ID_DEC_TULIP) ||
				(pci_did == PCI_DEVICE_ID_DEC_TULIP_PLUS) ||
				(pci_did == PCI_DEVICE_ID_DEC_21142))) {
				pci_read_config_32(0x70,
						0x10,
						&tulip_pci_base);
				/* Get the physical base address */
				tulip_base =
					(tulip_pci_base & ~0x03UL) + 0x80000000;
				/* Strobe the 21x4x reset bit in CSR0 */
				writel(0x1, tulip_base);
			}

			/* If this is genesis 2 board then check for no
			 * keyboard controller and more than one processor.
			 */
			if (board_type == 0xe0) {
				base_mod = inb(0x803);
				/* if a MVME2300/2400 or a Sitka then no keyboard */
				if((base_mod == 0xFA) || (base_mod == 0xF9) ||
				   (base_mod == 0xE1)) {
					keyb_present = 0;	/* no keyboard */
				}
			}
			/* If this is a multiprocessor system then
			 * park the other processor so that the
			 * kernel knows where to find them.
			 */
			if (residual->MaxNumCpus > 1)
				start_multi = 1;
		}
		memcpy(hold_residual,residual,sizeof(RESIDUAL));
        }

	/* Call decompress_kernel */
	decompress_kernel(load_addr, num_words, cksum);

	if (start_multi) {
		residual->VitalProductData.SmpIar = (unsigned long)0xc0;
		residual->Cpus[1].CpuState = CPU_GOOD;
		hold_residual->VitalProductData.Reserved5 = 0xdeadbeef;
	}

	/* Now go and clear out the BATs and ensure that our MSR is
	 * correct .*/
	disable_6xx_mmu();

	/* Make r3 be a pointer to the residual data. */
	return (unsigned long)hold_residual;
}

unsigned long
get_mem_size(void)
{
	unsigned int pci_viddid, pci_did;

	/* First, figure out what kind of host bridge we are on.  If it's
	 * an MPC10x, we can ask it directly how much memory it has.
	 * Otherwise, see if the residual data has anything.  This isn't
	 * the best way, but it can be the only way.  If there's nothing,
	 * assume 32MB. -- Tom.
	 */
	/* See what our host bridge is. */
	pci_read_config_32(0x00, 0x00, &pci_viddid);
	pci_did = (pci_viddid & 0xffff0000) >> 16;
	/* See if we are on an MPC10x. */
	if (((pci_viddid & 0xffff) == PCI_VENDOR_ID_MOTOROLA)
			&& ((pci_did == PCI_DEVICE_ID_MOTOROLA_MPC105)
				|| (pci_did == PCI_DEVICE_ID_MOTOROLA_MPC106)
				|| (pci_did == PCI_DEVICE_ID_MOTOROLA_MPC107)))
		return mpc10x_get_mem_size();
	/* If it's not, see if we have anything in the residual data. */
	else if (hold_residual && hold_residual->TotalMemory)
		return hold_residual->TotalMemory;
	else if (OFW_interface) {
		/*
		 * This is a 'best guess' check.  We want to make sure
		 * we don't try this on a PReP box without OF
		 *     -- Cort
		 */
		while (OFW_interface)
		{
			phandle dev_handle;
			int mem_info[2];

			/* get handle to memory description */
			if (!(dev_handle = finddevice("/memory@0")))
				break;

			/* get the info */
			if (getprop(dev_handle, "reg", mem_info,
						sizeof(mem_info)) != 8)
				break;

			return mem_info[1];
		}
	}

	/* Fall back to hard-coding 32MB. */
	return 32*1024*1024;
}