Some DWC AHCI SATA IP-core derivatives require to perform small platform
or IP-core specific setups. They are too small to be placed in a dedicated
driver. It's just much easier to have a set of quirks for them right in
the DWC AHCI driver code. Since we are about to add such platform support,
as a pre-requisite we introduce a platform-data based DWC AHCI quirks API.
The platform data can be used to define the flags passed to the
ahci_platform_get_resources() method, additional AHCI host-flags and a set
of callbacks to initialize, re-initialize and clear the platform settings.
Signed-off-by: Serge Semin <[email protected]>
---
drivers/ata/ahci_dwc.c | 52 ++++++++++++++++++++++++++++++++++++++----
1 file changed, 48 insertions(+), 4 deletions(-)
diff --git a/drivers/ata/ahci_dwc.c b/drivers/ata/ahci_dwc.c
index c51e2251994e..9e294f994ed3 100644
--- a/drivers/ata/ahci_dwc.c
+++ b/drivers/ata/ahci_dwc.c
@@ -90,7 +90,16 @@
#define DWC_AHCI_PORT_PHYCR 0x74
#define DWC_AHCI_PORT_PHYSR 0x78
+struct dwc_ahci_plat_data {
+ unsigned int pflags;
+ unsigned int hflags;
+ int (*init)(struct ahci_host_priv *hpriv);
+ int (*reinit)(struct ahci_host_priv *hpriv);
+ void (*clear)(struct ahci_host_priv *hpriv);
+};
+
struct dwc_ahci_host_priv {
+ const struct dwc_ahci_plat_data *pdata;
struct platform_device *pdev;
u32 timv;
@@ -107,11 +116,15 @@ static struct ahci_host_priv *dwc_ahci_get_resources(struct platform_device *pde
return ERR_PTR(-ENOMEM);
dpriv->pdev = pdev;
+ dpriv->pdata = device_get_match_data(&pdev->dev);
+ if (!dpriv->pdata)
+ return ERR_PTR(-EINVAL);
- hpriv = ahci_platform_get_resources(pdev, AHCI_PLATFORM_GET_RESETS);
+ hpriv = ahci_platform_get_resources(pdev, dpriv->pdata->pflags);
if (IS_ERR(hpriv))
return hpriv;
+ hpriv->flags |= dpriv->pdata->hflags;
hpriv->plat_data = (void *)dpriv;
return hpriv;
@@ -242,22 +255,33 @@ static int dwc_ahci_init_dmacr(struct ahci_host_priv *hpriv)
static int dwc_ahci_init_host(struct ahci_host_priv *hpriv)
{
+ struct dwc_ahci_host_priv *dpriv = hpriv->plat_data;
int rc;
rc = ahci_platform_enable_resources(hpriv);
if (rc)
return rc;
+ if (dpriv->pdata->init) {
+ rc = dpriv->pdata->init(hpriv);
+ if (rc)
+ goto err_disable_resources;
+ }
+
dwc_ahci_check_cap(hpriv);
dwc_ahci_init_timer(hpriv);
rc = dwc_ahci_init_dmacr(hpriv);
if (rc)
- goto err_disable_resources;
+ goto err_clear_platform;
return 0;
+err_clear_platform:
+ if (dpriv->pdata->clear)
+ dpriv->pdata->clear(hpriv);
+
err_disable_resources:
ahci_platform_disable_resources(hpriv);
@@ -275,6 +299,12 @@ static int dwc_ahci_reinit_host(struct ahci_host_priv *hpriv)
if (rc)
return rc;
+ if (dpriv->pdata->reinit) {
+ rc = dpriv->pdata->reinit(hpriv);
+ if (rc)
+ goto err_disable_resources;
+ }
+
writel(dpriv->timv, hpriv->mmio + DWC_AHCI_HOST_TIMER1MS);
for_each_set_bit(i, &port_map, AHCI_MAX_PORTS) {
@@ -283,10 +313,20 @@ static int dwc_ahci_reinit_host(struct ahci_host_priv *hpriv)
}
return 0;
+
+err_disable_resources:
+ ahci_platform_disable_resources(hpriv);
+
+ return rc;
}
static void dwc_ahci_clear_host(struct ahci_host_priv *hpriv)
{
+ struct dwc_ahci_host_priv *dpriv = hpriv->plat_data;
+
+ if (dpriv->pdata->clear)
+ dpriv->pdata->clear(hpriv);
+
ahci_platform_disable_resources(hpriv);
}
@@ -371,9 +411,13 @@ static int dwc_ahci_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(dwc_ahci_pm_ops, dwc_ahci_suspend, dwc_ahci_resume);
+struct dwc_ahci_plat_data dwc_ahci_plat = {
+ .pflags = AHCI_PLATFORM_GET_RESETS,
+};
+
static const struct of_device_id dwc_ahci_of_match[] = {
- { .compatible = "snps,dwc-ahci", },
- { .compatible = "snps,spear-ahci", },
+ { .compatible = "snps,dwc-ahci", &dwc_ahci_plat },
+ { .compatible = "snps,spear-ahci", &dwc_ahci_plat },
{},
};
MODULE_DEVICE_TABLE(of, dwc_ahci_of_match);
--
2.35.1