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
|
/*
* IBM/AMCC PPC4xx SoC setup code
*
* Copyright 2008 DENX Software Engineering, Stefan Roese <sr@denx.de>
*
* L2 cache routines cloned from arch/ppc/syslib/ibm440gx_common.c which is:
* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
* Copyright (c) 2003 - 2006 Zultys Technologies
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/of_platform.h>
#include <asm/dcr.h>
#include <asm/dcr-regs.h>
#include <asm/reg.h>
static u32 dcrbase_l2c;
/*
* L2-cache
*/
/* Issue L2C diagnostic command */
static inline u32 l2c_diag(u32 addr)
{
mtdcr(dcrbase_l2c + DCRN_L2C0_ADDR, addr);
mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_DIAG);
while (!(mfdcr(dcrbase_l2c + DCRN_L2C0_SR) & L2C_SR_CC))
;
return mfdcr(dcrbase_l2c + DCRN_L2C0_DATA);
}
static irqreturn_t l2c_error_handler(int irq, void *dev)
{
u32 sr = mfdcr(dcrbase_l2c + DCRN_L2C0_SR);
if (sr & L2C_SR_CPE) {
/* Read cache trapped address */
u32 addr = l2c_diag(0x42000000);
printk(KERN_EMERG "L2C: Cache Parity Error, addr[16:26] = 0x%08x\n",
addr);
}
if (sr & L2C_SR_TPE) {
/* Read tag trapped address */
u32 addr = l2c_diag(0x82000000) >> 16;
printk(KERN_EMERG "L2C: Tag Parity Error, addr[16:26] = 0x%08x\n",
addr);
}
/* Clear parity errors */
if (sr & (L2C_SR_CPE | L2C_SR_TPE)){
mtdcr(dcrbase_l2c + DCRN_L2C0_ADDR, 0);
mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
} else {
printk(KERN_EMERG "L2C: LRU error\n");
}
return IRQ_HANDLED;
}
static int __init ppc4xx_l2c_probe(void)
{
struct device_node *np;
u32 r;
unsigned long flags;
int irq;
const u32 *dcrreg;
u32 dcrbase_isram;
int len;
const u32 *prop;
u32 l2_size;
np = of_find_compatible_node(NULL, NULL, "ibm,l2-cache");
if (!np)
return 0;
/* Get l2 cache size */
prop = of_get_property(np, "cache-size", NULL);
if (prop == NULL) {
printk(KERN_ERR "%s: Can't get cache-size!\n", np->full_name);
of_node_put(np);
return -ENODEV;
}
l2_size = prop[0];
/* Map DCRs */
dcrreg = of_get_property(np, "dcr-reg", &len);
if (!dcrreg || (len != 4 * sizeof(u32))) {
printk(KERN_ERR "%s: Can't get DCR register base !",
np->full_name);
of_node_put(np);
return -ENODEV;
}
dcrbase_isram = dcrreg[0];
dcrbase_l2c = dcrreg[2];
/* Get and map irq number from device tree */
irq = irq_of_parse_and_map(np, 0);
if (irq == NO_IRQ) {
printk(KERN_ERR "irq_of_parse_and_map failed\n");
of_node_put(np);
return -ENODEV;
}
/* Install error handler */
if (request_irq(irq, l2c_error_handler, IRQF_DISABLED, "L2C", 0) < 0) {
printk(KERN_ERR "Cannot install L2C error handler"
", cache is not enabled\n");
of_node_put(np);
return -ENODEV;
}
local_irq_save(flags);
asm volatile ("sync" ::: "memory");
/* Disable SRAM */
mtdcr(dcrbase_isram + DCRN_SRAM0_DPC,
mfdcr(dcrbase_isram + DCRN_SRAM0_DPC) & ~SRAM_DPC_ENABLE);
mtdcr(dcrbase_isram + DCRN_SRAM0_SB0CR,
mfdcr(dcrbase_isram + DCRN_SRAM0_SB0CR) & ~SRAM_SBCR_BU_MASK);
mtdcr(dcrbase_isram + DCRN_SRAM0_SB1CR,
mfdcr(dcrbase_isram + DCRN_SRAM0_SB1CR) & ~SRAM_SBCR_BU_MASK);
mtdcr(dcrbase_isram + DCRN_SRAM0_SB2CR,
mfdcr(dcrbase_isram + DCRN_SRAM0_SB2CR) & ~SRAM_SBCR_BU_MASK);
mtdcr(dcrbase_isram + DCRN_SRAM0_SB3CR,
mfdcr(dcrbase_isram + DCRN_SRAM0_SB3CR) & ~SRAM_SBCR_BU_MASK);
/* Enable L2_MODE without ICU/DCU */
r = mfdcr(dcrbase_l2c + DCRN_L2C0_CFG) &
~(L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_SS_MASK);
r |= L2C_CFG_L2M | L2C_CFG_SS_256;
mtdcr(dcrbase_l2c + DCRN_L2C0_CFG, r);
mtdcr(dcrbase_l2c + DCRN_L2C0_ADDR, 0);
/* Hardware Clear Command */
mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_HCC);
while (!(mfdcr(dcrbase_l2c + DCRN_L2C0_SR) & L2C_SR_CC))
;
/* Clear Cache Parity and Tag Errors */
mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
/* Enable 64G snoop region starting at 0 */
r = mfdcr(dcrbase_l2c + DCRN_L2C0_SNP0) &
~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
r |= L2C_SNP_SSR_32G | L2C_SNP_ESR;
mtdcr(dcrbase_l2c + DCRN_L2C0_SNP0, r);
r = mfdcr(dcrbase_l2c + DCRN_L2C0_SNP1) &
~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
r |= 0x80000000 | L2C_SNP_SSR_32G | L2C_SNP_ESR;
mtdcr(dcrbase_l2c + DCRN_L2C0_SNP1, r);
asm volatile ("sync" ::: "memory");
/* Enable ICU/DCU ports */
r = mfdcr(dcrbase_l2c + DCRN_L2C0_CFG);
r &= ~(L2C_CFG_DCW_MASK | L2C_CFG_PMUX_MASK | L2C_CFG_PMIM
| L2C_CFG_TPEI | L2C_CFG_CPEI | L2C_CFG_NAM | L2C_CFG_NBRM);
r |= L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_TPC | L2C_CFG_CPC | L2C_CFG_FRAN
| L2C_CFG_CPIM | L2C_CFG_TPIM | L2C_CFG_LIM | L2C_CFG_SMCM;
/* Check for 460EX/GT special handling */
if (of_device_is_compatible(np, "ibm,l2-cache-460ex"))
r |= L2C_CFG_RDBW;
mtdcr(dcrbase_l2c + DCRN_L2C0_CFG, r);
asm volatile ("sync; isync" ::: "memory");
local_irq_restore(flags);
printk(KERN_INFO "%dk L2-cache enabled\n", l2_size >> 10);
of_node_put(np);
return 0;
}
arch_initcall(ppc4xx_l2c_probe);
/*
* At present, this routine just applies a system reset.
*/
void ppc4xx_reset_system(char *cmd)
{
mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_RST_SYSTEM);
while (1)
; /* Just in case the reset doesn't work */
}
|
