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slippy: Add iSSD power sequencing

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Without an LM10506-A the power sequencing for this
part needs to be done manually using GPIOs.

BUG=chrome-os-partner:19035
BRANCH=none
TEST=emerge-slippy chromeos-coreboot-slippy

Change-Id: I842152e5f7c30c8dbe37df0c344935a659eb2887
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/49648
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Duncan Laurie 2013-05-01 11:11:10 -07:00 • committed by ChromeBot
commit 80988f4e76
1 changed files with 38 additions and 0 deletions
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38
src/mainboard/google/slippy/romstage.c
View file

@ -18,7 +18,9 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <delay.h>
#include <stdint.h>
#include <stdlib.h>
#include <console/console.h>
#include "cpu/intel/haswell/haswell.h"
#include "northbridge/intel/haswell/haswell.h"
@ -71,6 +73,39 @@ const struct rcba_config_instruction rcba_config[] = {
RCBA_END_CONFIG,
};
/*
* Power Sequencing for SanDisk i100/i110 SSD
*
* Must be sequenced in this order with specified timing.
*
* 1. VCC_IO : 30us - 100ms
* 2. VCC_FLASH : 70us - 10ms
* 3. VCCQ : 70us - 10ms
* 4. VDDC : 30us - 100ms
*
* There is no feedback to know if the voltage has stabilized
* so this implementation will use the max ramp times. That
* means it adds significantly to the boot time.
*/
static void issd_power_sequence(void)
{
struct gpio_seq {
int gpio;
int wait_ms;
} issd_gpio_seq[] = {
{ 49, 100 }, /* VCC_IO: GPIO 49, wait 100ms */
{ 44, 10 }, /* VCC_FLASH: GPIO 44, wait 10ms */
{ 17, 10 }, /* VCCQ: GPIO 17, wait 10ms */
{ 16, 100 }, /* VDDC: GPIO 16, wait 100ms */
};
int step;
for (step = 0; step < ARRAY_SIZE(issd_gpio_seq); step++) {
set_gpio(issd_gpio_seq[step].gpio, 1);
udelay(issd_gpio_seq[step].wait_ms * 1000);
}
}
void mainboard_romstage_entry(unsigned long bist)
{
struct pei_data pei_data = {
@ -119,4 +154,7 @@ void mainboard_romstage_entry(unsigned long bist)
/* Call into the real romstage main with this board's attributes. */
romstage_common(&romstage_params);
/* Power sequence the iSSD module */
issd_power_sequence();
}