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-rw-r--r--arch/v850/kernel/sim85e2.c195
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diff --git a/arch/v850/kernel/sim85e2.c b/arch/v850/kernel/sim85e2.c
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--- a/arch/v850/kernel/sim85e2.c
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1/*
2 * arch/v850/kernel/sim85e2.c -- Machine-specific stuff for
3 * V850E2 RTL simulator
4 *
5 * Copyright (C) 2002,03 NEC Electronics Corporation
6 * Copyright (C) 2002,03 Miles Bader <miles@gnu.org>
7 *
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file COPYING in the main directory of this
10 * archive for more details.
11 *
12 * Written by Miles Bader <miles@gnu.org>
13 */
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/mm.h>
19#include <linux/swap.h>
20#include <linux/bootmem.h>
21#include <linux/irq.h>
22
23#include <asm/atomic.h>
24#include <asm/page.h>
25#include <asm/machdep.h>
26
27#include "mach.h"
28
29
30/* There are 4 possible areas we can use:
31
32 IRAM (1MB) is fast for instruction fetches, but slow for data
33 DRAM (1020KB) is fast for data, but slow for instructions
34 ERAM is cached, so should be fast for both insns and data
35 SDRAM is external DRAM, similar to ERAM
36*/
37
38#define INIT_MEMC_FOR_SDRAM
39#define USE_SDRAM_AREA
40#define KERNEL_IN_SDRAM_AREA
41
42#define DCACHE_MODE V850E2_CACHE_BTSC_DCM_WT
43/*#define DCACHE_MODE V850E2_CACHE_BTSC_DCM_WB_ALLOC*/
44
45#ifdef USE_SDRAM_AREA
46#define RAM_START SDRAM_ADDR
47#define RAM_END (SDRAM_ADDR + SDRAM_SIZE)
48#else
49/* When we use DRAM, we need to account for the fact that the end of it is
50 used for R0_RAM. */
51#define RAM_START DRAM_ADDR
52#define RAM_END R0_RAM_ADDR
53#endif
54
55
56extern void memcons_setup (void);
57
58
59#ifdef KERNEL_IN_SDRAM_AREA
60#define EARLY_INIT_SECTION_ATTR __attribute__ ((section (".early.text")))
61#else
62#define EARLY_INIT_SECTION_ATTR __init
63#endif
64
65void EARLY_INIT_SECTION_ATTR mach_early_init (void)
66{
67 /* The sim85e2 simulator tracks `undefined' values, so to make
68 debugging easier, we begin by zeroing out all otherwise
69 undefined registers. This is not strictly necessary.
70
71 The registers we zero are:
72 Every GPR except:
73 stack-pointer (r3)
74 task-pointer (r16)
75 our return addr (r31)
76 Every system register (SPR) that we know about except for
77 the PSW (SPR 5), which we zero except for the
78 disable-interrupts bit.
79 */
80
81 /* GPRs */
82 asm volatile (" mov r0, r1 ; mov r0, r2 ");
83 asm volatile ("mov r0, r4 ; mov r0, r5 ; mov r0, r6 ; mov r0, r7 ");
84 asm volatile ("mov r0, r8 ; mov r0, r9 ; mov r0, r10; mov r0, r11");
85 asm volatile ("mov r0, r12; mov r0, r13; mov r0, r14; mov r0, r15");
86 asm volatile (" mov r0, r17; mov r0, r18; mov r0, r19");
87 asm volatile ("mov r0, r20; mov r0, r21; mov r0, r22; mov r0, r23");
88 asm volatile ("mov r0, r24; mov r0, r25; mov r0, r26; mov r0, r27");
89 asm volatile ("mov r0, r28; mov r0, r29; mov r0, r30");
90
91 /* SPRs */
92 asm volatile ("ldsr r0, 0; ldsr r0, 1; ldsr r0, 2; ldsr r0, 3");
93 asm volatile ("ldsr r0, 4");
94 asm volatile ("addi 0x20, r0, r1; ldsr r1, 5"); /* PSW */
95 asm volatile ("ldsr r0, 16; ldsr r0, 17; ldsr r0, 18; ldsr r0, 19");
96 asm volatile ("ldsr r0, 20");
97
98
99#ifdef INIT_MEMC_FOR_SDRAM
100 /* Settings for SDRAM controller. */
101 V850E2_VSWC = 0x0042;
102 V850E2_BSC = 0x9286;
103 V850E2_BCT(0) = 0xb000; /* was: 0 */
104 V850E2_BCT(1) = 0x000b;
105 V850E2_ASC = 0;
106 V850E2_LBS = 0xa9aa; /* was: 0xaaaa */
107 V850E2_LBC(0) = 0;
108 V850E2_LBC(1) = 0; /* was: 0x3 */
109 V850E2_BCC = 0;
110 V850E2_RFS(4) = 0x800a; /* was: 0xf109 */
111 V850E2_SCR(4) = 0x2091; /* was: 0x20a1 */
112 V850E2_RFS(3) = 0x800c;
113 V850E2_SCR(3) = 0x20a1;
114 V850E2_DWC(0) = 0;
115 V850E2_DWC(1) = 0;
116#endif
117
118#if 0
119#ifdef CONFIG_V850E2_SIM85E2S
120 /* Turn on the caches. */
121 V850E2_CACHE_BTSC = V850E2_CACHE_BTSC_ICM | DCACHE_MODE;
122 V850E2_BHC = 0x1010;
123#elif CONFIG_V850E2_SIM85E2C
124 V850E2_CACHE_BTSC |= (V850E2_CACHE_BTSC_ICM | V850E2_CACHE_BTSC_DCM0);
125 V850E2_BUSM_BHC = 0xFFFF;
126#endif
127#else
128 V850E2_BHC = 0;
129#endif
130
131 /* Don't stop the simulator at `halt' instructions. */
132 SIM85E2_NOTHAL = 1;
133
134 /* Ensure that the simulator halts on a panic, instead of going
135 into an infinite loop inside the panic function. */
136 panic_timeout = -1;
137}
138
139void __init mach_setup (char **cmdline)
140{
141 memcons_setup ();
142}
143
144void mach_get_physical_ram (unsigned long *ram_start, unsigned long *ram_len)
145{
146 *ram_start = RAM_START;
147 *ram_len = RAM_END - RAM_START;
148}
149
150void __init mach_sched_init (struct irqaction *timer_action)
151{
152 /* The simulator actually cycles through all interrupts
153 periodically. We just pay attention to IRQ0, which gives us
154 1/64 the rate of the periodic interrupts. */
155 setup_irq (0, timer_action);
156}
157
158void mach_gettimeofday (struct timespec *tv)
159{
160 tv->tv_sec = 0;
161 tv->tv_nsec = 0;
162}
163
164/* Interrupts */
165
166struct v850e_intc_irq_init irq_inits[] = {
167 { "IRQ", 0, NUM_MACH_IRQS, 1, 7 },
168 { 0 }
169};
170struct hw_interrupt_type hw_itypes[1];
171
172/* Initialize interrupts. */
173void __init mach_init_irqs (void)
174{
175 v850e_intc_init_irq_types (irq_inits, hw_itypes);
176}
177
178
179void machine_halt (void) __attribute__ ((noreturn));
180void machine_halt (void)
181{
182 SIM85E2_SIMFIN = 0; /* Halt immediately. */
183 for (;;) {}
184}
185
186void machine_restart (char *__unused)
187{
188 machine_halt ();
189}
190
191void machine_power_off (void)
192{
193 machine_halt ();
194}
195
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