1/* 2 * arch/v850/kernel/anna.c -- Anna V850E2 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/kernel.h> 15#include <linux/module.h> 16#include <linux/init.h> 17#include <linux/bootmem.h> 18#include <linux/major.h> 19#include <linux/irq.h> 20 21#include <asm/machdep.h> 22#include <asm/atomic.h> 23#include <asm/page.h> 24#include <asm/v850e_timer_d.h> 25#include <asm/v850e_uart.h> 26 27#include "mach.h" 28 29 30/* SRAM and SDRAM are vaguely contiguous (with a big hole in between; see 31 mach_reserve_bootmem for details); use both as one big area. */ 32#define RAM_START SRAM_ADDR 33#define RAM_END (SDRAM_ADDR + SDRAM_SIZE) 34 35/* The bits of this port are connected to an 8-LED bar-graph. */ 36#define LEDS_PORT 0 37 38 39static void anna_led_tick (void); 40 41 42void __init mach_early_init (void) 43{ 44 ANNA_ILBEN = 0; 45 46 V850E2_CSC(0) = 0x402F; 47 V850E2_CSC(1) = 0x4000; 48 V850E2_BPC = 0; 49 V850E2_BSC = 0xAAAA; 50 V850E2_BEC = 0; 51 52 V850E2_BHC = 0; /* cache no memory */ 53 V850E2_BCT(0) = 0xB088; 54 V850E2_BCT(1) = 0x0008; 55 V850E2_DWC(0) = 0x0027; 56 V850E2_DWC(1) = 0; 57 V850E2_BCC = 0x0006; 58 V850E2_ASC = 0; 59 V850E2_LBS = 0x0089; 60 V850E2_SCR(3) = 0x21A9; 61 V850E2_RFS(3) = 0x8121; 62 63 v850e_intc_disable_irqs (); 64} 65 66void __init mach_setup (char **cmdline) 67{ 68 ANNA_PORT_PM (LEDS_PORT) = 0; /* Make all LED pins output pins. */ 69 mach_tick = anna_led_tick; 70} 71 72void __init mach_get_physical_ram (unsigned long *ram_start, 73 unsigned long *ram_len) 74{ 75 *ram_start = RAM_START; 76 *ram_len = RAM_END - RAM_START; 77} 78 79void __init mach_reserve_bootmem () 80{ 81 /* The space between SRAM and SDRAM is filled with duplicate 82 images of SRAM. Prevent the kernel from using them. */ 83 reserve_bootmem (SRAM_ADDR + SRAM_SIZE, 84 SDRAM_ADDR - (SRAM_ADDR + SRAM_SIZE)); 85} 86 87void mach_gettimeofday (struct timespec *tv) 88{ 89 tv->tv_sec = 0; 90 tv->tv_nsec = 0; 91} 92 93void __init mach_sched_init (struct irqaction *timer_action) 94{ 95 /* Start hardware timer. */ 96 v850e_timer_d_configure (0, HZ); 97 /* Install timer interrupt handler. */ 98 setup_irq (IRQ_INTCMD(0), timer_action); 99} 100 101static struct v850e_intc_irq_init irq_inits[] = { 102 { "IRQ", 0, NUM_MACH_IRQS, 1, 7 }, 103 { "PIN", IRQ_INTP(0), IRQ_INTP_NUM, 1, 4 }, 104 { "CCC", IRQ_INTCCC(0), IRQ_INTCCC_NUM, 1, 5 }, 105 { "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 5 }, 106 { "DMA", IRQ_INTDMA(0), IRQ_INTDMA_NUM, 1, 2 }, 107 { "DMXER", IRQ_INTDMXER,1, 1, 2 }, 108 { "SRE", IRQ_INTSRE(0), IRQ_INTSRE_NUM, 3, 3 }, 109 { "SR", IRQ_INTSR(0), IRQ_INTSR_NUM, 3, 4 }, 110 { "ST", IRQ_INTST(0), IRQ_INTST_NUM, 3, 5 }, 111 { 0 } 112}; 113#define NUM_IRQ_INITS (ARRAY_SIZE(irq_inits) - 1) 114 115static struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS]; 116 117void __init mach_init_irqs (void) 118{ 119 v850e_intc_init_irq_types (irq_inits, hw_itypes); 120} 121 122void machine_restart (char *__unused) 123{ 124#ifdef CONFIG_RESET_GUARD 125 disable_reset_guard (); 126#endif 127 asm ("jmp r0"); /* Jump to the reset vector. */ 128} 129 130void machine_halt (void) 131{ 132#ifdef CONFIG_RESET_GUARD 133 disable_reset_guard (); 134#endif 135 local_irq_disable (); /* Ignore all interrupts. */ 136 ANNA_PORT_IO(LEDS_PORT) = 0xAA; /* Note that we halted. */ 137 for (;;) 138 asm ("halt; nop; nop; nop; nop; nop"); 139} 140 141void machine_power_off (void) 142{ 143 machine_halt (); 144} 145 146/* Called before configuring an on-chip UART. */ 147void anna_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud) 148{ 149 /* The Anna connects some general-purpose I/O pins on the CPU to 150 the RTS/CTS lines of UART 1's serial connection. I/O pins P07 151 and P37 are RTS and CTS respectively. */ 152 if (chan == 1) { 153 ANNA_PORT_PM(0) &= ~0x80; /* P07 in output mode */ 154 ANNA_PORT_PM(3) |= 0x80; /* P37 in input mode */ 155 } 156} 157 158/* Minimum and maximum bounds for the moving upper LED boundary in the 159 clock tick display. We can't use the last bit because it's used for 160 UART0's CTS output. */ 161#define MIN_MAX_POS 0 162#define MAX_MAX_POS 6 163 164/* There are MAX_MAX_POS^2 - MIN_MAX_POS^2 cycles in the animation, so if 165 we pick 6 and 0 as above, we get 49 cycles, which is when divided into 166 the standard 100 value for HZ, gives us an almost 1s total time. */ 167#define TICKS_PER_FRAME \ 168 (HZ / (MAX_MAX_POS * MAX_MAX_POS - MIN_MAX_POS * MIN_MAX_POS)) 169 170static void anna_led_tick () 171{ 172 static unsigned counter = 0; 173 174 if (++counter == TICKS_PER_FRAME) { 175 static int pos = 0, max_pos = MAX_MAX_POS, dir = 1; 176 177 if (dir > 0 && pos == max_pos) { 178 dir = -1; 179 if (max_pos == MIN_MAX_POS) 180 max_pos = MAX_MAX_POS; 181 else 182 max_pos--; 183 } else { 184 if (dir < 0 && pos == 0) 185 dir = 1; 186 187 if (pos + dir <= max_pos) { 188 /* Each bit of port 0 has a LED. */ 189 clear_bit (pos, &ANNA_PORT_IO(LEDS_PORT)); 190 pos += dir; 191 set_bit (pos, &ANNA_PORT_IO(LEDS_PORT)); 192 } 193 } 194 195 counter = 0; 196 } 197} 198