mirror of https://gitee.com/openkylin/linux.git
144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
/*
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* PROM interface routines.
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/ioport.h>
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#include <asm/bootinfo.h>
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#include <asm/lasat/lasat.h>
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#include <asm/cpu.h>
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#include "at93c.h"
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#include <asm/lasat/eeprom.h>
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#include "prom.h"
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#define RESET_VECTOR 0xbfc00000
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#define PROM_JUMP_TABLE_ENTRY(n) (*((u32 *)(RESET_VECTOR + 0x20) + n))
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#define PROM_DISPLAY_ADDR PROM_JUMP_TABLE_ENTRY(0)
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#define PROM_PUTC_ADDR PROM_JUMP_TABLE_ENTRY(1)
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#define PROM_MONITOR_ADDR PROM_JUMP_TABLE_ENTRY(2)
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static void null_prom_printf(const char * fmt, ...)
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{
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}
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static void null_prom_display(const char *string, int pos, int clear)
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{
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}
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static void null_prom_monitor(void)
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{
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}
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static void null_prom_putc(char c)
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{
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}
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/* these are functions provided by the bootloader */
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static void (* prom_putc)(char c) = null_prom_putc;
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void (* prom_printf)(const char * fmt, ...) = null_prom_printf;
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void (* prom_display)(const char *string, int pos, int clear) =
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null_prom_display;
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void (* prom_monitor)(void) = null_prom_monitor;
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unsigned int lasat_ndelay_divider;
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#define PROM_PRINTFBUF_SIZE 256
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static char prom_printfbuf[PROM_PRINTFBUF_SIZE];
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static void real_prom_printf(const char * fmt, ...)
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{
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va_list ap;
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int len;
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char *c = prom_printfbuf;
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int i;
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va_start(ap, fmt);
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len = vsnprintf(prom_printfbuf, PROM_PRINTFBUF_SIZE, fmt, ap);
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va_end(ap);
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/* output overflowed the buffer */
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if (len < 0 || len > PROM_PRINTFBUF_SIZE)
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len = PROM_PRINTFBUF_SIZE;
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for (i=0; i < len; i++) {
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if (*c == '\n')
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prom_putc('\r');
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prom_putc(*c++);
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}
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}
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static void setup_prom_vectors(void)
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{
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u32 version = *(u32 *)(RESET_VECTOR + 0x90);
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if (version >= 307) {
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prom_display = (void *)PROM_DISPLAY_ADDR;
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prom_putc = (void *)PROM_PUTC_ADDR;
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prom_printf = real_prom_printf;
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prom_monitor = (void *)PROM_MONITOR_ADDR;
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}
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prom_printf("prom vectors set up\n");
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}
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static struct at93c_defs at93c_defs[N_MACHTYPES] = {
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{(void *)AT93C_REG_100, (void *)AT93C_RDATA_REG_100, AT93C_RDATA_SHIFT_100,
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AT93C_WDATA_SHIFT_100, AT93C_CS_M_100, AT93C_CLK_M_100},
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{(void *)AT93C_REG_200, (void *)AT93C_RDATA_REG_200, AT93C_RDATA_SHIFT_200,
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AT93C_WDATA_SHIFT_200, AT93C_CS_M_200, AT93C_CLK_M_200},
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};
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void __init prom_init(void)
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{
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int argc = fw_arg0;
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char **argv = (char **) fw_arg1;
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setup_prom_vectors();
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if (current_cpu_data.cputype == CPU_R5000) {
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prom_printf("LASAT 200 board\n");
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mips_machtype = MACH_LASAT_200;
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lasat_ndelay_divider = LASAT_200_DIVIDER;
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} else {
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prom_printf("LASAT 100 board\n");
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mips_machtype = MACH_LASAT_100;
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lasat_ndelay_divider = LASAT_100_DIVIDER;
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}
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at93c = &at93c_defs[mips_machtype];
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lasat_init_board_info(); /* Read info from EEPROM */
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mips_machgroup = MACH_GROUP_LASAT;
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/* Get the command line */
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if (argc > 0) {
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strncpy(arcs_cmdline, argv[0], CL_SIZE-1);
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arcs_cmdline[CL_SIZE-1] = '\0';
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}
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/* Set the I/O base address */
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set_io_port_base(KSEG1);
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/* Set memory regions */
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ioport_resource.start = 0;
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ioport_resource.end = 0xffffffff; /* Wrong, fixme. */
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add_memory_region(0, lasat_board_info.li_memsize, BOOT_MEM_RAM);
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}
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unsigned long __init prom_free_prom_memory(void)
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{
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return 0;
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}
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const char *get_system_type(void)
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{
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return lasat_board_info.li_bmstr;
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}
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