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进入standby的时候，无任何master访问DRAM时，调用下面函数：
__dram_power_save_process();
唤醒时调用函数
__dram_power_up_process();
注意代码不能运行在DRAM中
给出我的测试函数仅供参考
#if defined DRAMC_STANDBY_TEST
u32 dramc_w_test(unsigned int dram_size,unsigned int test_length)
{
/* DRAM Simple write_read test
* 2 ranks: write_read rank0 and rank1;
* 1rank : write_read rank0 base and half size;
* */
unsigned int i;
unsigned int half_size;
unsigned int val;
half_size = ((dram_size >> 1)<<20);
for(i=0;i<test_length;i++)
{
mctl_write_w(0x12345678 + i,(DRAM_MEM_BASE_ADDR + i*4));//rank0
mctl_write_w(0x87654321 + i,(DRAM_MEM_BASE_ADDR + half_size + i*4));//half size (rank1)
}
}
u32 dramc_r_cmp_test(unsigned int dram_size,unsigned int test_length)
{
unsigned int i;
unsigned int half_size;
unsigned int val;
half_size = ((dram_size >> 1)<<20);
for(i=0;i<test_length;i++)
{
val = mctl_read_w(DRAM_MEM_BASE_ADDR + half_size + i*4);
if(val !=(0x87654321 + i)) /* Write last,read first */
{
dram_dbg("DRAM simple test FAIL.\n");
dram_dbg("%x != %x at address %x\n",val,0x87654321 + i,DRAM_MEM_BASE_ADDR + half_size + i*4);
// pattern_goto(i);
// while(1);
return DRAM_RET_FAIL;
}
val = mctl_read_w(DRAM_MEM_BASE_ADDR + i*4);
if(val != (0x12345678+i))
{
dram_dbg("DRAM simple test FAIL.\n");
dram_dbg("%x != %x at address %x\n",val,0x12345678 + i,DRAM_MEM_BASE_ADDR + i*4);
// while(1);
return DRAM_RET_FAIL;
// pattern_goto(i+1);
}
}
// dram_dbg("DRAM simple test OK\n");
return DRAM_RET_OK;
u32 dramc_standby_test(u32 dram_size)
{
u32 ret = 0;
u32 i,test_length = 0x1000;
u32 test_cycle = 1000000;
printk("standby test start,test cycle is %d\n",test_cycle);
dramc_w_test(dram_size,test_length);
for(i=0;i<test_cycle;i++)
{
printk("test loop %d begin,",i);
__dram_power_save_process();
printk("standby entry ok,");
dram_udelay(10000);
__dram_power_up_process();
printk("wake up ok,");
ret = dramc_r_cmp_test(dram_size,test_length);
if(ret)
{
printk("read compare test fail\n");
return ret;
}
else
printk("read compare test OK\n");
}
if(ret)
printk("standby test fail!!\n");
else
printk("standby test ok!!\n");
return ret;
}
#endif
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