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ahci: EM message type auto detect

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Detect enclosure management message type automatically at driver
initialization, instead of using module parameter "ahci_em_messages".

Signed-off-by: Harry Zhang <harry.zhang@amd.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Harry Zhang
2010-04-23 17:27:19 +08:00
committed by Jeff Garzik
parent ec86c81dfc
commit 008dbd61eb
3 changed files with 28 additions and 20 deletions
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38
drivers/ata/libahci.c
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@@ -184,7 +184,7 @@ EXPORT_SYMBOL_GPL(ahci_em_messages);
module_param(ahci_em_messages, int, 0444);
/* add other LED protocol types when they become supported */
MODULE_PARM_DESC(ahci_em_messages,
"Set AHCI Enclosure Management Message type (0 = disabled, 1 = LED");
"AHCI Enclosure Management Message control (0 = off, 1 = on)");
static void ahci_enable_ahci(void __iomem *mmio)
{
@@ -931,27 +931,29 @@ static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
return -EBUSY;
}
/*
* create message header - this is all zero except for
* the message size, which is 4 bytes.
*/
message[0] |= (4 << 8);
if (hpriv->em_msg_type & EM_MSG_TYPE_LED) {
/*
* create message header - this is all zero except for
* the message size, which is 4 bytes.
*/
message[0] |= (4 << 8);
/* ignore 0:4 of byte zero, fill in port info yourself */
message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
/* ignore 0:4 of byte zero, fill in port info yourself */
message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
/* write message to EM_LOC */
writel(message[0], mmio + hpriv->em_loc);
writel(message[1], mmio + hpriv->em_loc+4);
/* write message to EM_LOC */
writel(message[0], mmio + hpriv->em_loc);
writel(message[1], mmio + hpriv->em_loc+4);
/*
* tell hardware to transmit the message
*/
writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
}
/* save off new led state for port/slot */
emp->led_state = state;
/*
* tell hardware to transmit the message
*/
writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
spin_unlock_irqrestore(ap->lock, flags);
return size;
}
@@ -2094,10 +2096,10 @@ void ahci_set_em_messages(struct ahci_host_priv *hpriv,
messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
/* we only support LED message type right now */
if ((messages & 0x01) && (ahci_em_messages == 1)) {
if (messages) {
/* store em_loc */
hpriv->em_loc = ((em_loc >> 16) * 4);
hpriv->em_msg_type = messages;
pi->flags |= ATA_FLAG_EM;
if (!(em_ctl & EM_CTL_ALHD))
pi->flags |= ATA_FLAG_SW_ACTIVITY;