summaryrefslogtreecommitdiffstats
path: root/kernel/arch/powerpc/platforms/85xx/xes_mpc85xx.c
blob: 1a9c1085855fea67a08da7f18a3e42793183ff94 (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
/*
 * Copyright (C) 2009 Extreme Engineering Solutions, Inc.
 *
 * X-ES board-specific functionality
 *
 * Based on mpc85xx_ds code from Freescale Semiconductor, Inc.
 *
 * Author: Nate Case <ncase@xes-inc.com>
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/delay.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/of_platform.h>

#include <asm/time.h>
#include <asm/machdep.h>
#include <asm/pci-bridge.h>
#include <mm/mmu_decl.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/mpic.h>

#include <sysdev/fsl_soc.h>
#include <sysdev/fsl_pci.h>
#include "smp.h"

#include "mpc85xx.h"

/* A few bit definitions needed for fixups on some boards */
#define MPC85xx_L2CTL_L2E		0x80000000 /* L2 enable */
#define MPC85xx_L2CTL_L2I		0x40000000 /* L2 flash invalidate */
#define MPC85xx_L2CTL_L2SIZ_MASK	0x30000000 /* L2 SRAM size (R/O) */

void __init xes_mpc85xx_pic_init(void)
{
	struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN,
			0, 256, " OpenPIC  ");
	BUG_ON(mpic == NULL);
	mpic_init(mpic);
}

static void xes_mpc85xx_configure_l2(void __iomem *l2_base)
{
	volatile uint32_t ctl, tmp;

	asm volatile("msync; isync");
	tmp = in_be32(l2_base);

	/*
	 * xMon may have enabled part of L2 as SRAM, so we need to set it
	 * up for all cache mode just to be safe.
	 */
	printk(KERN_INFO "xes_mpc85xx: Enabling L2 as cache\n");

	ctl = MPC85xx_L2CTL_L2E | MPC85xx_L2CTL_L2I;
	if (of_machine_is_compatible("MPC8540") ||
	    of_machine_is_compatible("MPC8560"))
		/*
		 * Assume L2 SRAM is used fully for cache, so set
		 * L2BLKSZ (bits 4:5) to match L2SIZ (bits 2:3).
		 */
		ctl |= (tmp & MPC85xx_L2CTL_L2SIZ_MASK) >> 2;

	asm volatile("msync; isync");
	out_be32(l2_base, ctl);
	asm volatile("msync; isync");
}

static void xes_mpc85xx_fixups(void)
{
	struct device_node *np;
	int err;

	/*
	 * Legacy xMon firmware on some X-ES boards does not enable L2
	 * as cache.  We must ensure that they get enabled here.
	 */
	for_each_node_by_name(np, "l2-cache-controller") {
		struct resource r[2];
		void __iomem *l2_base;

		/* Only MPC8548, MPC8540, and MPC8560 boards are affected */
		if (!of_device_is_compatible(np,
				    "fsl,mpc8548-l2-cache-controller") &&
		    !of_device_is_compatible(np,
				    "fsl,mpc8540-l2-cache-controller") &&
		    !of_device_is_compatible(np,
				    "fsl,mpc8560-l2-cache-controller"))
			continue;

		err = of_address_to_resource(np, 0, &r[0]);
		if (err) {
			printk(KERN_WARNING "xes_mpc85xx: Could not get "
			       "resource for device tree node '%s'",
			       np->full_name);
			continue;
		}

		l2_base = ioremap(r[0].start, resource_size(&r[0]));

		xes_mpc85xx_configure_l2(l2_base);
	}
}

/*
 * Setup the architecture
 */
static void __init xes_mpc85xx_setup_arch(void)
{
	struct device_node *root;
	const char *model = "Unknown";

	root = of_find_node_by_path("/");
	if (root == NULL)
		return;

	model = of_get_property(root, "model", NULL);

	printk(KERN_INFO "X-ES MPC85xx-based single-board computer: %s\n",
	       model + strlen("xes,"));

	xes_mpc85xx_fixups();

	mpc85xx_smp_init();

	fsl_pci_assign_primary();
}

machine_arch_initcall(xes_mpc8572, mpc85xx_common_publish_devices);
machine_arch_initcall(xes_mpc8548, mpc85xx_common_publish_devices);
machine_arch_initcall(xes_mpc8540, mpc85xx_common_publish_devices);

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init xes_mpc8572_probe(void)
{
	unsigned long root = of_get_flat_dt_root();

	return of_flat_dt_is_compatible(root, "xes,MPC8572");
}

static int __init xes_mpc8548_probe(void)
{
	unsigned long root = of_get_flat_dt_root();

	return of_flat_dt_is_compatible(root, "xes,MPC8548");
}

static int __init xes_mpc8540_probe(void)
{
	unsigned long root = of_get_flat_dt_root();

	return of_flat_dt_is_compatible(root, "xes,MPC8540");
}

define_machine(xes_mpc8572) {
	.name			= "X-ES MPC8572",
	.probe			= xes_mpc8572_probe,
	.setup_arch		= xes_mpc85xx_setup_arch,
	.init_IRQ		= xes_mpc85xx_pic_init,
#ifdef CONFIG_PCI
	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
#endif
	.get_irq		= mpic_get_irq,
	.restart		= fsl_rstcr_restart,
	.calibrate_decr		= generic_calibrate_decr,
	.progress		= udbg_progress,
};

define_machine(xes_mpc8548) {
	.name			= "X-ES MPC8548",
	.probe			= xes_mpc8548_probe,
	.setup_arch		= xes_mpc85xx_setup_arch,
	.init_IRQ		= xes_mpc85xx_pic_init,
#ifdef CONFIG_PCI
	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
#endif
	.get_irq		= mpic_get_irq,
	.restart		= fsl_rstcr_restart,
	.calibrate_decr		= generic_calibrate_decr,
	.progress		= udbg_progress,
};

define_machine(xes_mpc8540) {
	.name			= "X-ES MPC8540",
	.probe			= xes_mpc8540_probe,
	.setup_arch		= xes_mpc85xx_setup_arch,
	.init_IRQ		= xes_mpc85xx_pic_init,
#ifdef CONFIG_PCI
	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
#endif
	.get_irq		= mpic_get_irq,
	.restart		= fsl_rstcr_restart,
	.calibrate_decr		= generic_calibrate_decr,
	.progress		= udbg_progress,
};