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ahci: factor out AHCI enabling and enable AHCI before reading CAP

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Factor out AHCI enabling into ahci_enable_ahci() and enabling AHCI
before reading CAP in ahci_save_initial_config() as the spec requires
enabling AHCI mode before accessing any other registers.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2008-01-05 23:11:57 +09:00 committed by Jeff Garzik
parent c729072459
commit b710a1f4b3
1 changed files with 20 additions and 7 deletions
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27
drivers/ata/ahci.c
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@ -597,6 +597,20 @@ static inline void __iomem *ahci_port_base(struct ata_port *ap)
return __ahci_port_base(ap->host, ap->port_no);
}
static void ahci_enable_ahci(void __iomem *mmio)
{
u32 tmp;
/* turn on AHCI_EN */
tmp = readl(mmio + HOST_CTL);
if (!(tmp & HOST_AHCI_EN)) {
tmp |= HOST_AHCI_EN;
writel(tmp, mmio + HOST_CTL);
tmp = readl(mmio + HOST_CTL); /* flush && sanity check */
WARN_ON(!(tmp & HOST_AHCI_EN));
}
}
/**
* ahci_save_initial_config - Save and fixup initial config values
* @pdev: target PCI device
@ -619,6 +633,9 @@ static void ahci_save_initial_config(struct pci_dev *pdev,
u32 cap, port_map;
int i;
/* make sure AHCI mode is enabled before accessing CAP */
ahci_enable_ahci(mmio);
/* Values prefixed with saved_ are written back to host after
* reset. Values without are used for driver operation.
*/
@ -1043,13 +1060,10 @@ static int ahci_reset_controller(struct ata_host *host)
/* we must be in AHCI mode, before using anything
* AHCI-specific, such as HOST_RESET.
*/
tmp = readl(mmio + HOST_CTL);
if (!(tmp & HOST_AHCI_EN)) {
tmp |= HOST_AHCI_EN;
writel(tmp, mmio + HOST_CTL);
}
ahci_enable_ahci(mmio);
/* global controller reset */
tmp = readl(mmio + HOST_CTL);
if ((tmp & HOST_RESET) == 0) {
writel(tmp | HOST_RESET, mmio + HOST_CTL);
readl(mmio + HOST_CTL); /* flush */
@ -1068,8 +1082,7 @@ static int ahci_reset_controller(struct ata_host *host)
}
/* turn on AHCI mode */
writel(HOST_AHCI_EN, mmio + HOST_CTL);
(void) readl(mmio + HOST_CTL); /* flush */
ahci_enable_ahci(mmio);
/* some registers might be cleared on reset. restore initial values */
ahci_restore_initial_config(host);