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mvsata_ide: adjust port init sequence

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mvsata_ide_initialize_port(): adjust init sequence (SStatus
should be checked only after all writes to SControl) and
return success/failure to ide_preinit().

Also, as some tests showed init durations in the hundreds
of us, raise the time-out to 01 ms to be on the safe side.

Signed-off-by: Albert Aribaud <albert.aribaud@free.fr>
This commit is contained in:
Albert Aribaud 2010-09-16 20:30:30 +05:30 • committed by Prafulla Wadaskar
parent d778a2fbb3
commit 7054cfda65
1 changed files with 33 additions and 9 deletions
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42
drivers/block/mvsata_ide.c
View file

@ -90,6 +90,18 @@ struct mvsata_port_registers {
#define MVSATA_SSTATUS_DET_MASK 0x0000000F
#define MVSATA_SSTATUS_DET_DEVCOMM 0x00000003
/*
* Status codes to return to client callers. Currently, callers ignore
* exact value and only care for zero or nonzero, so no need to make this
* public, it is only #define'd for clarity.
* If/when standard negative codes are implemented in U-boot, then these
* #defines should be moved to, or replaced by ones from, the common list
* of status codes.
*/
#define MVSATA_STATUS_OK 0
#define MVSATA_STATUS_TIMEOUT -1
/*
* Initialize one MVSATAHC port: set SControl's IPM to "always active"
* and DET to "reset", then wait for SStatus's DET to become "device and
@ -97,23 +109,30 @@ struct mvsata_port_registers {
* DET back to "no action".
*/
static void mvsata_ide_initialize_port(struct mvsata_port_registers *port)
static int mvsata_ide_initialize_port(struct mvsata_port_registers *port)
{
u32 control;
u32 status;
u32 tout = 50; /* wait at most 50 us for SATA reset to complete */
u32 timeleft = 10000; /* wait at most 10 ms for SATA reset to complete */
/* Set control IPM to 3 (no low power) and DET to 1 (initialize) */
control = readl(&port->scontrol);
control = (control & ~MVSATA_SCONTROL_MASK) | MVSATA_PORT_INIT;
writel(control, &port->scontrol);
while (--tout) {
/* Toggle control DET back to 0 (normal operation) */
control = (control & ~MVSATA_SCONTROL_MASK) | MVSATA_PORT_USE;
writel(control, &port->scontrol);
/* wait for status DET to become 3 (device and communication OK) */
while (--timeleft) {
status = readl(&port->sstatus) & MVSATA_SSTATUS_DET_MASK;
if (status == MVSATA_SSTATUS_DET_DEVCOMM)
break;
udelay(1);
}
control = (control & ~MVSATA_SCONTROL_MASK) | MVSATA_PORT_USE;
writel(control, &port->scontrol);
/* return success or time-out error depending on time left */
if (!timeleft)
return MVSATA_STATUS_TIMEOUT;
return MVSATA_STATUS_OK;
}
/*
@ -123,18 +142,23 @@ static void mvsata_ide_initialize_port(struct mvsata_port_registers *port)
int ide_preinit(void)
{
int status;
/* Enable ATA port 0 (could be SATA port 0 or 1) if declared */
#if defined(CONFIG_SYS_ATA_IDE0_OFFSET)
mvsata_ide_initialize_port(
status = mvsata_ide_initialize_port(
(struct mvsata_port_registers *)
(CONFIG_SYS_ATA_BASE_ADDR + CONFIG_SYS_ATA_IDE0_OFFSET));
if (status)
return status;
#endif
/* Enable ATA port 1 (could be SATA port 0 or 1) if declared */
#if defined(CONFIG_SYS_ATA_IDE1_OFFSET)
mvsata_ide_initialize_port(
status = mvsata_ide_initialize_port(
(struct mvsata_port_registers *)
(CONFIG_SYS_ATA_BASE_ADDR + CONFIG_SYS_ATA_IDE1_OFFSET));
if (status)
return status;
#endif
/* return 0 as we always succeed */
return 0;
/* return success if all ports initializations succeeded */
return MVSATA_STATUS_OK;
}