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Diffstat (limited to 'arch/v850/kernel/anna.c')
| -rw-r--r-- | arch/v850/kernel/anna.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/arch/v850/kernel/anna.c b/arch/v850/kernel/anna.c new file mode 100644 index 0000000..6aaeab5 --- /dev/null +++ b/arch/v850/kernel/anna.c @@ -0,0 +1,208 @@ +/* + * arch/v850/kernel/anna.c -- Anna V850E2 evaluation chip/board + * + * Copyright (C) 2002,03 NEC Electronics Corporation + * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/bootmem.h> +#include <linux/major.h> +#include <linux/irq.h> + +#include <asm/machdep.h> +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/v850e_timer_d.h> +#include <asm/v850e_uart.h> + +#include "mach.h" + + +/* SRAM and SDRAM are vaguely contiguous (with a big hole in between; see + mach_reserve_bootmem for details); use both as one big area. */ +#define RAM_START SRAM_ADDR +#define RAM_END (SDRAM_ADDR + SDRAM_SIZE) + +/* The bits of this port are connected to an 8-LED bar-graph. */ +#define LEDS_PORT 0 + + +static void anna_led_tick (void); + + +void __init mach_early_init (void) +{ + ANNA_ILBEN = 0; + + V850E2_CSC(0) = 0x402F; + V850E2_CSC(1) = 0x4000; + V850E2_BPC = 0; + V850E2_BSC = 0xAAAA; + V850E2_BEC = 0; + +#if 0 + V850E2_BHC = 0xFFFF; /* icache all memory, dcache all */ +#else + V850E2_BHC = 0; /* cache no memory */ +#endif + V850E2_BCT(0) = 0xB088; + V850E2_BCT(1) = 0x0008; + V850E2_DWC(0) = 0x0027; + V850E2_DWC(1) = 0; + V850E2_BCC = 0x0006; + V850E2_ASC = 0; + V850E2_LBS = 0x0089; + V850E2_SCR(3) = 0x21A9; + V850E2_RFS(3) = 0x8121; + + v850e_intc_disable_irqs (); +} + +void __init mach_setup (char **cmdline) +{ + ANNA_PORT_PM (LEDS_PORT) = 0; /* Make all LED pins output pins. */ + mach_tick = anna_led_tick; +} + +void __init mach_get_physical_ram (unsigned long *ram_start, + unsigned long *ram_len) +{ + *ram_start = RAM_START; + *ram_len = RAM_END - RAM_START; +} + +void __init mach_reserve_bootmem () +{ + /* The space between SRAM and SDRAM is filled with duplicate + images of SRAM. Prevent the kernel from using them. */ + reserve_bootmem (SRAM_ADDR + SRAM_SIZE, + SDRAM_ADDR - (SRAM_ADDR + SRAM_SIZE)); +} + +void mach_gettimeofday (struct timespec *tv) +{ + tv->tv_sec = 0; + tv->tv_nsec = 0; +} + +void __init mach_sched_init (struct irqaction *timer_action) +{ + /* Start hardware timer. */ + v850e_timer_d_configure (0, HZ); + /* Install timer interrupt handler. */ + setup_irq (IRQ_INTCMD(0), timer_action); +} + +static struct v850e_intc_irq_init irq_inits[] = { + { "IRQ", 0, NUM_MACH_IRQS, 1, 7 }, + { "PIN", IRQ_INTP(0), IRQ_INTP_NUM, 1, 4 }, + { "CCC", IRQ_INTCCC(0), IRQ_INTCCC_NUM, 1, 5 }, + { "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 5 }, + { "DMA", IRQ_INTDMA(0), IRQ_INTDMA_NUM, 1, 2 }, + { "DMXER", IRQ_INTDMXER,1, 1, 2 }, + { "SRE", IRQ_INTSRE(0), IRQ_INTSRE_NUM, 3, 3 }, + { "SR", IRQ_INTSR(0), IRQ_INTSR_NUM, 3, 4 }, + { "ST", IRQ_INTST(0), IRQ_INTST_NUM, 3, 5 }, + { 0 } +}; +#define NUM_IRQ_INITS ((sizeof irq_inits / sizeof irq_inits[0]) - 1) + +static struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS]; + +void __init mach_init_irqs (void) +{ + v850e_intc_init_irq_types (irq_inits, hw_itypes); +} + +void machine_restart (char *__unused) +{ +#ifdef CONFIG_RESET_GUARD + disable_reset_guard (); +#endif + asm ("jmp r0"); /* Jump to the reset vector. */ +} + +EXPORT_SYMBOL(machine_restart); + +void machine_halt (void) +{ +#ifdef CONFIG_RESET_GUARD + disable_reset_guard (); +#endif + local_irq_disable (); /* Ignore all interrupts. */ + ANNA_PORT_IO(LEDS_PORT) = 0xAA; /* Note that we halted. */ + for (;;) + asm ("halt; nop; nop; nop; nop; nop"); +} + +EXPORT_SYMBOL(machine_halt); + +void machine_power_off (void) +{ + machine_halt (); +} + +EXPORT_SYMBOL(machine_power_off); + +/* Called before configuring an on-chip UART. */ +void anna_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud) +{ + /* The Anna connects some general-purpose I/O pins on the CPU to + the RTS/CTS lines of UART 1's serial connection. I/O pins P07 + and P37 are RTS and CTS respectively. */ + if (chan == 1) { + ANNA_PORT_PM(0) &= ~0x80; /* P07 in output mode */ + ANNA_PORT_PM(3) |= 0x80; /* P37 in input mode */ + } +} + +/* Minimum and maximum bounds for the moving upper LED boundary in the + clock tick display. We can't use the last bit because it's used for + UART0's CTS output. */ +#define MIN_MAX_POS 0 +#define MAX_MAX_POS 6 + +/* There are MAX_MAX_POS^2 - MIN_MAX_POS^2 cycles in the animation, so if + we pick 6 and 0 as above, we get 49 cycles, which is when divided into + the standard 100 value for HZ, gives us an almost 1s total time. */ +#define TICKS_PER_FRAME \ + (HZ / (MAX_MAX_POS * MAX_MAX_POS - MIN_MAX_POS * MIN_MAX_POS)) + +static void anna_led_tick () +{ + static unsigned counter = 0; + + if (++counter == TICKS_PER_FRAME) { + static int pos = 0, max_pos = MAX_MAX_POS, dir = 1; + + if (dir > 0 && pos == max_pos) { + dir = -1; + if (max_pos == MIN_MAX_POS) + max_pos = MAX_MAX_POS; + else + max_pos--; + } else { + if (dir < 0 && pos == 0) + dir = 1; + + if (pos + dir <= max_pos) { + /* Each bit of port 0 has a LED. */ + clear_bit (pos, &ANNA_PORT_IO(LEDS_PORT)); + pos += dir; + set_bit (pos, &ANNA_PORT_IO(LEDS_PORT)); + } + } + + counter = 0; + } +} |
