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authorTejun Heo <htejun@gmail.com>2006-11-02 12:17:23 +0900
committerJeff Garzik <jeff@garzik.org>2006-12-01 22:41:31 -0500
commit98fa4b60c673526fdd478d9719e41cd9e2b84986 (patch)
tree696cb1f0d19bbda6dc9030eb11e4b2754472dfaa /drivers/ata
parentada406c8246b0792afe4d7f8ae7606093052de87 (diff)
[PATCH] ahci: preserve PORTS_IMPL over host resets
Instead of writing 0xf blindly, preserve the content of write-once PORTS_IMPL register over host resets. This patch is taken from Jeff Garzik's AHCI init update patch. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/ahci.c23
1 files changed, 20 insertions, 3 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index bc6599e4f47..f2277be70c0 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -421,6 +421,11 @@ static struct pci_driver ahci_pci_driver = {
};
+static inline int ahci_nr_ports(u32 cap)
+{
+ return (cap & 0x1f) + 1;
+}
+
static inline unsigned long ahci_port_base_ul (unsigned long base, unsigned int port)
{
return base + 0x100 + (port * 0x80);
@@ -630,11 +635,12 @@ static int ahci_deinit_port(void __iomem *port_mmio, u32 cap, const char **emsg)
static int ahci_reset_controller(void __iomem *mmio, struct pci_dev *pdev)
{
- u32 cap_save, tmp;
+ u32 cap_save, impl_save, tmp;
cap_save = readl(mmio + HOST_CAP);
cap_save &= ( (1<<28) | (1<<17) );
cap_save |= (1 << 27);
+ impl_save = readl(mmio + HOST_PORTS_IMPL);
/* global controller reset */
tmp = readl(mmio + HOST_CTL);
@@ -655,10 +661,21 @@ static int ahci_reset_controller(void __iomem *mmio, struct pci_dev *pdev)
return -EIO;
}
+ /* turn on AHCI mode */
writel(HOST_AHCI_EN, mmio + HOST_CTL);
(void) readl(mmio + HOST_CTL); /* flush */
+
+ /* These write-once registers are normally cleared on reset.
+ * Restore BIOS values... which we HOPE were present before
+ * reset.
+ */
+ if (!impl_save) {
+ impl_save = (1 << ahci_nr_ports(cap_save)) - 1;
+ dev_printk(KERN_WARNING, &pdev->dev,
+ "PORTS_IMPL is zero, forcing 0x%x\n", impl_save);
+ }
writel(cap_save, mmio + HOST_CAP);
- writel(0xf, mmio + HOST_PORTS_IMPL);
+ writel(impl_save, mmio + HOST_PORTS_IMPL);
(void) readl(mmio + HOST_PORTS_IMPL); /* flush */
if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
@@ -1467,7 +1484,7 @@ static int ahci_host_init(struct ata_probe_ent *probe_ent)
hpriv->cap = readl(mmio + HOST_CAP);
hpriv->port_map = readl(mmio + HOST_PORTS_IMPL);
- probe_ent->n_ports = (hpriv->cap & 0x1f) + 1;
+ probe_ent->n_ports = ahci_nr_ports(hpriv->cap);
VPRINTK("cap 0x%x port_map 0x%x n_ports %d\n",
hpriv->cap, hpriv->port_map, probe_ent->n_ports);