lowlevel.s.svn-base

来自「RT-Thread是发展中的下一代微内核嵌入式实时操作系统」· SVN-BASE 代码 · 共 55 行

/**
 * @addtogroup sgps44b0
 */
/*@{*/

	.equ SPUCR, 	0x1d2004c
	.equ EXTINT, 	0x1d20050
	.equ INTMSK, 	0x1e0000c
	.equ LOCKTIME, 	0x1d8000c
	.equ PLLCON, 	0x1d80000
	.equ CLKCON,	0x1d80004
	.equ BWSCON, 	0x1c80000

.globl lowlevel_init
lowlevel_init:
	/* set clock */
	ldr	r0,=LOCKTIME
	ldr	r1,=800		/* count = t_lock * Fin (t_lock=200us, Fin=10MHz) = 2000*/
	str	r1,[r0]
	
	/* PLL setting */
	ldr r0,=PLLCON
	ldr	r1,=0x34031	/* Fin = 10MHz, Fout = 60MHz*/
	str	r1,[r0]

	/* All unit block CLK enable */
	ldr	r0,=CLKCON
	ldr	r1,=0x7ff8
	str	r1,[r0]

	/* All unit block CLK enable */
	ldr	r0,=CLKCON
	ldr	r1,=0x7ff8
	str	r1,[r0]

	mov pc, lr

SMRDATA:
	.long 0x11001000	/* Bank0=OM[1:0], Bank1~Bank5=8bit, Bank6,7 16bit */
   	.long 0x600			/* GCS0 ; BOOT ROM */
	.long 0x7ffc		/* GCS1 ; SRAM */
	.long 0x7ffc		/* GCS2 ; NAND FLASH */
	.long 0x500			/* GCS3 ; USB */
	.long 0x7ffc		/* GCS4 ; NONE -  PORT LED(TEST) */
	.long 0x7ffc		/* GCS5 ; NONE -  PORT LED(TEST) */
	.long 0x18000		/* GCS6 ; COLUMN ADDRESS 8BIT (TBS6418B4E-7) */
	.long 0x18000		/* GCS7 ; NONE */
	.long 0x82062c		/* REFRESH RFEN=1, TREFMD=0, trp=3clk, trc=5clk, tchr=3clk,count=1579 -- k4s561632 32Mbyte */
						/* refcount = 2048+1-MCLK*ref_period ==2047-60*7.81=1579 =0x62b */
	.long 0x10			/* SCLK power mode, BANKSIZE 32M/32M (K4S561632) */
	.long 0x20			/* MRSR6 CL=2clk */
	.long 0x20			/* MRSR7 */

/*@}*/