sunxi: update SATA driver to always use DM_SCSI

It seems like the Allwinner SATA driver is already quite capable of
using the driver model, so we can force this on all boards and can
remove support for a non-DM_SCSI build.
This removes the warning about boards with SATA ports not being
DM_SCSI compliant.

It also takes the opportunity to move the driver out of the board/sunxi
directory to join its siblings in drivers/ata, and to make it a proper
Kconfig citizen.

The board defconfigs stay untouched.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagan Teki <jagan@openedev.com>
[jagan: select DM_SCSI separately]
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>

3 files changed, 134 insertions, 0 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 7ebee75c0a..4be5c63f09 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -101,6 +101,14 @@ config SATA_SIL3114
 	help
 	  Enable this driver to support the SIL3114 SATA controllers.
 
+config SUNXI_AHCI
+	bool "Enable Allwinner SATA driver support"
+	depends on AHCI
+	default y if ARCH_SUNXI
+	help
+	  Enable this driver to support the SATA controllers found in the
+	  Allwinner A10, A20 and R40 SoCs.
+
 config AHCI_MVEBU
 	bool "Marvell EBU AHCI SATA support"
 	depends on ARCH_MVEBU
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 10bed53bb3..a69edb10f7 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -18,3 +18,4 @@ obj-$(CONFIG_SATA_SIL3114) += sata_sil3114.o
 obj-$(CONFIG_SATA_SIL) += sata_sil.o
 obj-$(CONFIG_SANDBOX) += sata_sandbox.o
 obj-$(CONFIG_AHCI_MVEBU) += ahci_mvebu.o
+obj-$(CONFIG_SUNXI_AHCI) += ahci_sunxi.o
diff --git a/drivers/ata/ahci_sunxi.c b/drivers/ata/ahci_sunxi.c
new file mode 100644
index 0000000000..77b932aa03
--- /dev/null
+++ b/drivers/ata/ahci_sunxi.c
@@ -0,0 +1,125 @@
+#include <common.h>
+#include <ahci.h>
+#include <dm.h>
+#include <scsi.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+#define AHCI_PHYCS0R 0x00c0
+#define AHCI_PHYCS1R 0x00c4
+#define AHCI_PHYCS2R 0x00c8
+#define AHCI_RWCR    0x00fc
+
+/* This magic PHY initialisation was taken from the Allwinner releases
+ * and Linux driver, but is completely undocumented.
+ */
+static int sunxi_ahci_phy_init(u8 *reg_base)
+{
+	u32 reg_val;
+	int timeout;
+
+	writel(0, reg_base + AHCI_RWCR);
+	mdelay(5);
+
+	setbits_le32(reg_base + AHCI_PHYCS1R, 0x1 << 19);
+	clrsetbits_le32(reg_base + AHCI_PHYCS0R,
+			(0x7 << 24),
+			(0x5 << 24) | (0x1 << 23) | (0x1 << 18));
+	clrsetbits_le32(reg_base + AHCI_PHYCS1R,
+			(0x3 << 16) | (0x1f << 8) | (0x3 << 6),
+			(0x2 << 16) | (0x6 << 8) | (0x2 << 6));
+	setbits_le32(reg_base + AHCI_PHYCS1R, (0x1 << 28) | (0x1 << 15));
+	clrbits_le32(reg_base + AHCI_PHYCS1R, (0x1 << 19));
+	clrsetbits_le32(reg_base + AHCI_PHYCS0R, (0x7 << 20), (0x3 << 20));
+	clrsetbits_le32(reg_base + AHCI_PHYCS2R, (0x1f << 5), (0x19 << 5));
+	mdelay(5);
+
+	setbits_le32(reg_base + AHCI_PHYCS0R, (0x1 << 19));
+
+	timeout = 250; /* Power up takes approx 50 us */
+	for (;;) {
+		reg_val = readl(reg_base + AHCI_PHYCS0R) & (0x7 << 28);
+		if (reg_val == (0x2 << 28))
+			break;
+		if (--timeout == 0) {
+			printf("AHCI PHY power up failed.\n");
+			return -EIO;
+		}
+		udelay(1);
+	};
+
+	setbits_le32(reg_base + AHCI_PHYCS2R, (0x1 << 24));
+
+	timeout = 100; /* Calibration takes approx 10 us */
+	for (;;) {
+		reg_val = readl(reg_base + AHCI_PHYCS2R) & (0x1 << 24);
+		if (reg_val == 0x0)
+			break;
+		if (--timeout == 0) {
+			printf("AHCI PHY calibration failed.\n");
+			return -EIO;
+		}
+		udelay(1);
+	}
+
+	mdelay(15);
+
+	writel(0x7, reg_base + AHCI_RWCR);
+
+	return 0;
+}
+
+static int sunxi_sata_probe(struct udevice *dev)
+{
+	ulong base;
+	u8 *reg;
+	int ret;
+
+	base = dev_read_addr(dev);
+	if (base == FDT_ADDR_T_NONE) {
+		debug("%s: Failed to find address (err=%d\n)", __func__, ret);
+		return -EINVAL;
+	}
+	reg = (u8 *)base;
+	ret = sunxi_ahci_phy_init(reg);
+	if (ret) {
+		debug("%s: Failed to init phy (err=%d\n)", __func__, ret);
+		return ret;
+	}
+	ret = ahci_probe_scsi(dev, base);
+	if (ret) {
+		debug("%s: Failed to probe (err=%d\n)", __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int sunxi_sata_bind(struct udevice *dev)
+{
+	struct udevice *scsi_dev;
+	int ret;
+
+	ret = ahci_bind_scsi(dev, &scsi_dev);
+	if (ret) {
+		debug("%s: Failed to bind (err=%d\n)", __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct udevice_id sunxi_ahci_ids[] = {
+	{ .compatible = "allwinner,sun4i-a10-ahci" },
+	{ .compatible = "allwinner,sun8i-r40-ahci" },
+	{ }
+};
+
+U_BOOT_DRIVER(ahci_sunxi_drv) = {
+	.name		= "ahci_sunxi",
+	.id		= UCLASS_AHCI,
+	.of_match	= sunxi_ahci_ids,
+	.bind		= sunxi_sata_bind,
+	.probe		= sunxi_sata_probe,
+};