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cfa10036: Retrieve the RAM size at runtime 

The cfa-10036 comes in two flavours, with either 128MB or 256MB of RAM
on it.

Since it's not stored anywhere, we need to runtime detect it by
introducing the cfa10036_get_ram_size function.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Alexandre Belloni 2013-03-27 15:40:36 +01:00 committed by Sascha Hauer
parent 01cc0084d9
commit 18196fcf5f
1 changed files with 17 additions and 1 deletions
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18
arch/arm/boards/crystalfontz-cfa10036/cfa10036.c
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@ -90,9 +90,25 @@ static struct i2c_gpio_platform_data i2c_gpio_pdata = {
.udelay = 5, /* ~100 kHz */
};
void v5_mmu_cache_flush(void);
long cfa10036_get_ram_size(void)
{
volatile u32 *base = (void *)IMX_MEMORY_BASE;
volatile u32 *ofs = base + SZ_128M / sizeof(u32);
*base = *ofs = 0xdeadbeef;
*ofs = 0xbaadcafe;
v5_mmu_cache_flush();
if (*base == 0xbaadcafe)
return SZ_128M;
else
return SZ_256M;
}
static int cfa10036_mem_init(void)
{
arm_add_mem_device("ram0", IMX_MEMORY_BASE, 128 * 1024 * 1024);
arm_add_mem_device("ram0", IMX_MEMORY_BASE, cfa10036_get_ram_size());
return 0;
}