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1 | /* |
2 | * arch/v850/kernel/as85ep1.c -- AS85EP1 V850E evaluation chip/board | |
3 | * | |
4 | * Copyright (C) 2002,03 NEC Electronics Corporation | |
5 | * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> | |
6 | * | |
7 | * This file is subject to the terms and conditions of the GNU General | |
8 | * Public License. See the file COPYING in the main directory of this | |
9 | * archive for more details. | |
10 | * | |
11 | * Written by Miles Bader <miles@gnu.org> | |
12 | */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/bootmem.h> | |
19 | #include <linux/major.h> | |
20 | #include <linux/irq.h> | |
21 | ||
22 | #include <asm/machdep.h> | |
23 | #include <asm/atomic.h> | |
24 | #include <asm/page.h> | |
25 | #include <asm/v850e_timer_d.h> | |
26 | #include <asm/v850e_uart.h> | |
27 | ||
28 | #include "mach.h" | |
29 | ||
30 | ||
31 | /* SRAM and SDRAM are vaguely contiguous (with a big hole in between; see | |
32 | mach_reserve_bootmem for details); use both as one big area. */ | |
33 | #define RAM_START SRAM_ADDR | |
34 | #define RAM_END (SDRAM_ADDR + SDRAM_SIZE) | |
35 | ||
36 | /* The bits of this port are connected to an 8-LED bar-graph. */ | |
37 | #define LEDS_PORT 4 | |
38 | ||
39 | ||
40 | static void as85ep1_led_tick (void); | |
41 | ||
42 | extern char _intv_copy_src_start, _intv_copy_src_end; | |
43 | extern char _intv_copy_dst_start; | |
44 | ||
45 | ||
46 | void __init mach_early_init (void) | |
47 | { | |
48 | #ifndef CONFIG_ROM_KERNEL | |
49 | const u32 *src; | |
50 | register u32 *dst asm ("ep"); | |
51 | #endif | |
52 | ||
53 | AS85EP1_CSC(0) = 0x0403; | |
54 | AS85EP1_BCT(0) = 0xB8B8; | |
55 | AS85EP1_DWC(0) = 0x0104; | |
56 | AS85EP1_BCC = 0x0012; | |
57 | AS85EP1_ASC = 0; | |
58 | AS85EP1_LBS = 0x00A9; | |
59 | ||
60 | AS85EP1_PORT_PMC(6) = 0xFF; /* valid A0,A1,A20-A25 */ | |
61 | AS85EP1_PORT_PMC(7) = 0x0E; /* valid CS1-CS3 */ | |
62 | AS85EP1_PORT_PMC(9) = 0xFF; /* valid D16-D23 */ | |
63 | AS85EP1_PORT_PMC(10) = 0xFF; /* valid D24-D31 */ | |
64 | ||
65 | AS85EP1_RFS(1) = 0x800c; | |
66 | AS85EP1_RFS(3) = 0x800c; | |
67 | AS85EP1_SCR(1) = 0x20A9; | |
68 | AS85EP1_SCR(3) = 0x20A9; | |
69 | ||
70 | #ifndef CONFIG_ROM_KERNEL | |
71 | /* The early chip we have is buggy, and writing the interrupt | |
72 | vectors into low RAM may screw up, so for non-ROM kernels, we | |
73 | only rely on the reset vector being downloaded, and copy the | |
74 | rest of the interrupt vectors into place here. The specific bug | |
75 | is that writing address N, where (N & 0x10) == 0x10, will _also_ | |
76 | write to address (N - 0x10). We avoid this (effectively) by | |
77 | writing in 16-byte chunks backwards from the end. */ | |
78 | ||
79 | AS85EP1_IRAMM = 0x3; /* "write-mode" for the internal instruction memory */ | |
80 | ||
81 | src = (u32 *)(((u32)&_intv_copy_src_end - 1) & ~0xF); | |
82 | dst = (u32 *)&_intv_copy_dst_start | |
83 | + (src - (u32 *)&_intv_copy_src_start); | |
84 | do { | |
85 | u32 t0 = src[0], t1 = src[1], t2 = src[2], t3 = src[3]; | |
86 | dst[0] = t0; dst[1] = t1; dst[2] = t2; dst[3] = t3; | |
87 | dst -= 4; | |
88 | src -= 4; | |
89 | } while (src > (u32 *)&_intv_copy_src_start); | |
90 | ||
91 | AS85EP1_IRAMM = 0x0; /* "read-mode" for the internal instruction memory */ | |
92 | #endif /* !CONFIG_ROM_KERNEL */ | |
93 | ||
94 | v850e_intc_disable_irqs (); | |
95 | } | |
96 | ||
97 | void __init mach_setup (char **cmdline) | |
98 | { | |
99 | AS85EP1_PORT_PMC (LEDS_PORT) = 0; /* Make the LEDs port an I/O port. */ | |
100 | AS85EP1_PORT_PM (LEDS_PORT) = 0; /* Make all the bits output pins. */ | |
101 | mach_tick = as85ep1_led_tick; | |
102 | } | |
103 | ||
104 | void __init mach_get_physical_ram (unsigned long *ram_start, | |
105 | unsigned long *ram_len) | |
106 | { | |
107 | *ram_start = RAM_START; | |
108 | *ram_len = RAM_END - RAM_START; | |
109 | } | |
110 | ||
111 | /* Convenience macros. */ | |
112 | #define SRAM_END (SRAM_ADDR + SRAM_SIZE) | |
113 | #define SDRAM_END (SDRAM_ADDR + SDRAM_SIZE) | |
114 | ||
115 | void __init mach_reserve_bootmem () | |
116 | { | |
117 | if (SDRAM_ADDR < RAM_END && SDRAM_ADDR > RAM_START) | |
118 | /* We can't use the space between SRAM and SDRAM, so | |
119 | prevent the kernel from trying. */ | |
120 | reserve_bootmem (SRAM_END, SDRAM_ADDR - SRAM_END); | |
121 | } | |
122 | ||
123 | void mach_gettimeofday (struct timespec *tv) | |
124 | { | |
125 | tv->tv_sec = 0; | |
126 | tv->tv_nsec = 0; | |
127 | } | |
128 | ||
129 | void __init mach_sched_init (struct irqaction *timer_action) | |
130 | { | |
131 | /* Start hardware timer. */ | |
132 | v850e_timer_d_configure (0, HZ); | |
133 | /* Install timer interrupt handler. */ | |
134 | setup_irq (IRQ_INTCMD(0), timer_action); | |
135 | } | |
136 | ||
137 | static struct v850e_intc_irq_init irq_inits[] = { | |
138 | { "IRQ", 0, NUM_MACH_IRQS, 1, 7 }, | |
139 | { "CCC", IRQ_INTCCC(0), IRQ_INTCCC_NUM, 1, 5 }, | |
140 | { "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 5 }, | |
141 | { "SRE", IRQ_INTSRE(0), IRQ_INTSRE_NUM, 3, 3 }, | |
142 | { "SR", IRQ_INTSR(0), IRQ_INTSR_NUM, 3, 4 }, | |
143 | { "ST", IRQ_INTST(0), IRQ_INTST_NUM, 3, 5 }, | |
144 | { 0 } | |
145 | }; | |
146 | #define NUM_IRQ_INITS ((sizeof irq_inits / sizeof irq_inits[0]) - 1) | |
147 | ||
148 | static struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS]; | |
149 | ||
150 | void __init mach_init_irqs (void) | |
151 | { | |
152 | v850e_intc_init_irq_types (irq_inits, hw_itypes); | |
153 | } | |
154 | ||
155 | void machine_restart (char *__unused) | |
156 | { | |
157 | #ifdef CONFIG_RESET_GUARD | |
158 | disable_reset_guard (); | |
159 | #endif | |
160 | asm ("jmp r0"); /* Jump to the reset vector. */ | |
161 | } | |
162 | ||
1da177e4 LT |
163 | void machine_halt (void) |
164 | { | |
165 | #ifdef CONFIG_RESET_GUARD | |
166 | disable_reset_guard (); | |
167 | #endif | |
168 | local_irq_disable (); /* Ignore all interrupts. */ | |
169 | AS85EP1_PORT_IO (LEDS_PORT) = 0xAA; /* Note that we halted. */ | |
170 | for (;;) | |
171 | asm ("halt; nop; nop; nop; nop; nop"); | |
172 | } | |
173 | ||
1da177e4 LT |
174 | void machine_power_off (void) |
175 | { | |
176 | machine_halt (); | |
177 | } | |
178 | ||
1da177e4 LT |
179 | /* Called before configuring an on-chip UART. */ |
180 | void as85ep1_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud) | |
181 | { | |
182 | /* Make the shared uart/port pins be uart pins. */ | |
183 | AS85EP1_PORT_PMC(3) |= (0x5 << chan); | |
184 | ||
185 | /* The AS85EP1 connects some general-purpose I/O pins on the CPU to | |
186 | the RTS/CTS lines of UART 1's serial connection. I/O pins P53 | |
187 | and P54 are RTS and CTS respectively. */ | |
188 | if (chan == 1) { | |
189 | /* Put P53 & P54 in I/O port mode. */ | |
190 | AS85EP1_PORT_PMC(5) &= ~0x18; | |
191 | /* Make P53 an output, and P54 an input. */ | |
192 | AS85EP1_PORT_PM(5) |= 0x10; | |
193 | } | |
194 | } | |
195 | ||
196 | /* Minimum and maximum bounds for the moving upper LED boundary in the | |
197 | clock tick display. */ | |
198 | #define MIN_MAX_POS 0 | |
199 | #define MAX_MAX_POS 7 | |
200 | ||
201 | /* There are MAX_MAX_POS^2 - MIN_MAX_POS^2 cycles in the animation, so if | |
202 | we pick 6 and 0 as above, we get 49 cycles, which is when divided into | |
203 | the standard 100 value for HZ, gives us an almost 1s total time. */ | |
204 | #define TICKS_PER_FRAME \ | |
205 | (HZ / (MAX_MAX_POS * MAX_MAX_POS - MIN_MAX_POS * MIN_MAX_POS)) | |
206 | ||
207 | static void as85ep1_led_tick () | |
208 | { | |
209 | static unsigned counter = 0; | |
210 | ||
211 | if (++counter == TICKS_PER_FRAME) { | |
212 | static int pos = 0, max_pos = MAX_MAX_POS, dir = 1; | |
213 | ||
214 | if (dir > 0 && pos == max_pos) { | |
215 | dir = -1; | |
216 | if (max_pos == MIN_MAX_POS) | |
217 | max_pos = MAX_MAX_POS; | |
218 | else | |
219 | max_pos--; | |
220 | } else { | |
221 | if (dir < 0 && pos == 0) | |
222 | dir = 1; | |
223 | ||
224 | if (pos + dir <= max_pos) { | |
225 | /* Each bit of port 0 has a LED. */ | |
226 | set_bit (pos, &AS85EP1_PORT_IO(LEDS_PORT)); | |
227 | pos += dir; | |
228 | clear_bit (pos, &AS85EP1_PORT_IO(LEDS_PORT)); | |
229 | } | |
230 | } | |
231 | ||
232 | counter = 0; | |
233 | } | |
234 | } |