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-rw-r--r--drivers/ata/Kconfig1
-rw-r--r--drivers/ata/ahci_dwc.c55
2 files changed, 56 insertions, 0 deletions
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 12dd147e434e..1a8a1bbc8a0e 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -179,6 +179,7 @@ config AHCI_DM816
config AHCI_DWC
tristate "Synopsys DWC AHCI SATA support"
select SATA_HOST
+ select MFD_SYSCON if (MIPS_BAIKAL_T1 || COMPILE_TEST)
help
This option enables support for the Synopsys DWC AHCI SATA
controller implementation.
diff --git a/drivers/ata/ahci_dwc.c b/drivers/ata/ahci_dwc.c
index 6e64d3502669..8fb66860db31 100644
--- a/drivers/ata/ahci_dwc.c
+++ b/drivers/ata/ahci_dwc.c
@@ -13,10 +13,12 @@
#include <linux/kernel.h>
#include <linux/libata.h>
#include <linux/log2.h>
+#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
+#include <linux/regmap.h>
#include "ahci.h"
@@ -90,6 +92,20 @@
#define AHCI_DWC_PORT_PHYCR 0x74
#define AHCI_DWC_PORT_PHYSR 0x78
+/* Baikal-T1 AHCI SATA specific registers */
+#define AHCI_BT1_HOST_PHYCR AHCI_DWC_HOST_GPCR
+#define AHCI_BT1_HOST_MPLM_MASK GENMASK(29, 23)
+#define AHCI_BT1_HOST_LOSDT_MASK GENMASK(22, 20)
+#define AHCI_BT1_HOST_CRR BIT(19)
+#define AHCI_BT1_HOST_CRW BIT(18)
+#define AHCI_BT1_HOST_CRCD BIT(17)
+#define AHCI_BT1_HOST_CRCA BIT(16)
+#define AHCI_BT1_HOST_CRDI_MASK GENMASK(15, 0)
+
+#define AHCI_BT1_HOST_PHYSR AHCI_DWC_HOST_GPSR
+#define AHCI_BT1_HOST_CRA BIT(16)
+#define AHCI_BT1_HOST_CRDO_MASK GENMASK(15, 0)
+
struct ahci_dwc_plat_data {
unsigned int pflags;
unsigned int hflags;
@@ -106,6 +122,39 @@ struct ahci_dwc_host_priv {
u32 dmacr[AHCI_MAX_PORTS];
};
+static int ahci_bt1_init(struct ahci_host_priv *hpriv)
+{
+ struct ahci_dwc_host_priv *dpriv = hpriv->plat_data;
+ int ret;
+
+ /* APB, application and reference clocks are required */
+ if (!ahci_platform_find_clk(hpriv, "pclk") ||
+ !ahci_platform_find_clk(hpriv, "aclk") ||
+ !ahci_platform_find_clk(hpriv, "ref")) {
+ dev_err(&dpriv->pdev->dev, "No system clocks specified\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Fully reset the SATA AXI and ref clocks domain to ensure the state
+ * machine is working from scratch especially if the reference clocks
+ * source has been changed.
+ */
+ ret = ahci_platform_assert_rsts(hpriv);
+ if (ret) {
+ dev_err(&dpriv->pdev->dev, "Couldn't assert the resets\n");
+ return ret;
+ }
+
+ ret = ahci_platform_deassert_rsts(hpriv);
+ if (ret) {
+ dev_err(&dpriv->pdev->dev, "Couldn't de-assert the resets\n");
+ return ret;
+ }
+
+ return 0;
+}
+
static struct ahci_host_priv *ahci_dwc_get_resources(struct platform_device *pdev)
{
struct ahci_dwc_host_priv *dpriv;
@@ -414,9 +463,15 @@ static struct ahci_dwc_plat_data ahci_dwc_plat = {
.pflags = AHCI_PLATFORM_GET_RESETS,
};
+static struct ahci_dwc_plat_data ahci_bt1_plat = {
+ .pflags = AHCI_PLATFORM_GET_RESETS | AHCI_PLATFORM_RST_TRIGGER,
+ .init = ahci_bt1_init,
+};
+
static const struct of_device_id ahci_dwc_of_match[] = {
{ .compatible = "snps,dwc-ahci", &ahci_dwc_plat },
{ .compatible = "snps,spear-ahci", &ahci_dwc_plat },
+ { .compatible = "baikal,bt1-ahci", &ahci_bt1_plat },
{},
};
MODULE_DEVICE_TABLE(of, ahci_dwc_of_match);