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Subject[PATCH v3 21/23] ata: ahci-dwc: Add platform-specific quirks support
Date
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 <Sergey.Semin@baikalelectronics.ru>

---

Changelog v2:
- Change the local objects prefix from 'dwc_ahci_' to 'ahci_dwc_'.
(@Damien)
---
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 73380aaaebab..f987efa1ad59 100644
--- a/drivers/ata/ahci_dwc.c
+++ b/drivers/ata/ahci_dwc.c
@@ -90,7 +90,16 @@
#define AHCI_DWC_PORT_PHYCR 0x74
#define AHCI_DWC_PORT_PHYSR 0x78

+struct ahci_dwc_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 ahci_dwc_host_priv {
+ const struct ahci_dwc_plat_data *pdata;
struct platform_device *pdev;

u32 timv;
@@ -107,11 +116,15 @@ static struct ahci_host_priv *ahci_dwc_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 ahci_dwc_init_dmacr(struct ahci_host_priv *hpriv)

static int ahci_dwc_init_host(struct ahci_host_priv *hpriv)
{
+ struct ahci_dwc_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;
+ }
+
ahci_dwc_check_cap(hpriv);

ahci_dwc_init_timer(hpriv);

rc = ahci_dwc_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 ahci_dwc_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 + AHCI_DWC_HOST_TIMER1MS);

for_each_set_bit(i, &port_map, AHCI_MAX_PORTS) {
@@ -283,10 +313,20 @@ static int ahci_dwc_reinit_host(struct ahci_host_priv *hpriv)
}

return 0;
+
+err_disable_resources:
+ ahci_platform_disable_resources(hpriv);
+
+ return rc;
}

static void ahci_dwc_clear_host(struct ahci_host_priv *hpriv)
{
+ struct ahci_dwc_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 ahci_dwc_resume(struct device *dev)

static SIMPLE_DEV_PM_OPS(ahci_dwc_pm_ops, ahci_dwc_suspend, ahci_dwc_resume);

+struct ahci_dwc_plat_data ahci_dwc_plat = {
+ .pflags = AHCI_PLATFORM_GET_RESETS,
+};
+
static const struct of_device_id ahci_dwc_of_match[] = {
- { .compatible = "snps,dwc-ahci", },
- { .compatible = "snps,spear-ahci", },
+ { .compatible = "snps,dwc-ahci", &ahci_dwc_plat },
+ { .compatible = "snps,spear-ahci", &ahci_dwc_plat },
{},
};
MODULE_DEVICE_TABLE(of, ahci_dwc_of_match);
--
2.35.1
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