common/cmd_mem_mask.c

/* mem write function with mask setting */

#include <common.h>
#include <command.h>
#include <watchdog.h>
#include <asm/io.h>

#define wr_reg(addr, data)	writel(data, addr)
#define rd_reg(addr)	readl(addr)

int do_mem_mw_mask(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	char *endp;
	unsigned long reg_add=0;
	unsigned int wr_reg_value=0;
	unsigned int rd_reg_value=0;
	unsigned int wr_reg_and_mask_1=0xffffffff;
	if (argc < 4) {
		//cmd_usage(cmdtp);
		return -1;
	}
	reg_add = simple_strtoul(argv[1], &endp, 10);
	wr_reg_value = simple_strtoul(argv[2], &endp, 10);
	wr_reg_and_mask_1 = simple_strtoul(argv[3], &endp, 10);
	rd_reg_value = (rd_reg(reg_add));
	wr_reg(reg_add,(rd_reg_value&wr_reg_and_mask_1)|(wr_reg_value&(~wr_reg_and_mask_1)) );
	printf("mwm 0x%lx:[0x%8x] with [0x%8x] ok\n", reg_add, rd_reg_value, rd_reg(reg_add));
	return 0;
}

U_BOOT_CMD(
	mwm,	30,	1,	do_mem_mw_mask,
	"mw mask function",
	"[reg] [value] [mask]\n"
	"    //write [reg] with [value], skip [mask] bits\n"
	"eg: mwm 0x01000000 0xaaaabbbb 0x0000ffff\n"
	"    then read 0x01000000 = 0xaaaaXXXX //skip mask bits\n"
);