[PATCH 1/6] ata: ahci: add AHCI support for Berlin SoCs

Antoine Ténart
2014-04-22T15:38:59Z

Add support for the Berlin SoCs AHCI SATA controller allowing to
interface with devices like external hard drives.

Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
---
drivers/ata/Kconfig | 9 +++
drivers/ata/Makefile | 1 +
drivers/ata/ahci_berlin.c | 175 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 185 insertions(+)
create mode 100644 drivers/ata/ahci_berlin.c

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 20e03a7eb8b4..c985dfcd5a6c 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -97,6 +97,15 @@ config SATA_AHCI_PLATFORM

If unsure, say N.

+config AHCI_BERLIN
+ tristate "Marvell Berlin AHCI SATA support"
+ depends on ARCH_BERLIN
+ help
+ This option enables support for the Marvell Berlin SoC's
+ onboard AHCI SATA.
+
+ If unsure, say N.
+
config AHCI_DA850
tristate "DaVinci DA850 AHCI SATA support"
depends on ARCH_DAVINCI_DA850
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 44c8016e565c..7fb78d1e0a44 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_SATA_INIC162X) += sata_inic162x.o
obj-$(CONFIG_SATA_SIL24) += sata_sil24.o
obj-$(CONFIG_SATA_DWC) += sata_dwc_460ex.o
obj-$(CONFIG_SATA_HIGHBANK) += sata_highbank.o libahci.o
+obj-$(CONFIG_AHCI_BERLIN) += ahci_berlin.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_DA850) += ahci_da850.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_IMX) += ahci_imx.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_SUNXI) += ahci_sunxi.o libahci.o libahci_platform.o
diff --git a/drivers/ata/ahci_berlin.c b/drivers/ata/ahci_berlin.c
new file mode 100644
index 000000000000..cf1c9d3b9d18
--- /dev/null
+++ b/drivers/ata/ahci_berlin.c
@@ -0,0 +1,175 @@
+/*
+ * Marvell Berlin AHCI SATA platform driver
+ *
+ * Copyright (C) 2014 Marvell Technology Group Ltd.
+ *
+ * Antoine Ténart <antoine.tenart@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/ahci_platform.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+#include "ahci.h"
+
+#define PORT_VSR_ADDR 0x78
+#define PORT_VSR_DATA 0x7C
+#define HOST_VSA_ADDR 0xA0
+#define HOST_VSA_DATA 0xA4
+
+static inline void ahci_berlin_reg_setbits(void __iomem *reg, u32 val)
+{
+ u32 regval;
+
+ regval = readl(reg);
+ regval |= val;
+ writel(regval, reg);
+}
+
+static inline void ahci_berlin_reg_set(void __iomem *reg, u32 val)
+{
+ writel(val, reg);
+}
+
+static inline void ahci_berlin_reg_clear_set(void __iomem *reg, u32 clear_val,
+ u32 set_val)
+{
+ u32 regval;
+
+ regval = readl(reg);
+ regval &= ~(clear_val);
+ regval |= set_val;
+ writel(regval, reg);
+}
+
+static void ahci_berlin_init(void __iomem *mmio)
+{
+ /* interface select */
+ ahci_berlin_reg_set(mmio + HOST_VSA_ADDR, BIT(2));
+ ahci_berlin_reg_set(mmio + HOST_VSA_ADDR,
+ BIT(21) | BIT(18) | BIT(5) | BIT(4) | BIT(2));
+
+}
+
+static void ahci_berlin_port_init(void __iomem *mmio, unsigned int ports)
+{
+ int p;
+
+ /* power down pll */
+ ahci_berlin_reg_set(mmio + HOST_VSA_ADDR, 0x0);
+ ahci_berlin_reg_setbits(mmio + HOST_VSA_DATA, BIT(6));
+
+ for (p = 0; p < ports; p++) {
+ /* port control register */
+ void __iomem *ctrl_reg = mmio + 0x100 + (p * 0x80);
+
+ /* set PHY mode to SATA, ref freq to 25 MHz */
+ ahci_berlin_reg_set(ctrl_reg + PORT_VSR_ADDR, 0x201);
+ ahci_berlin_reg_clear_set(ctrl_reg + PORT_VSR_DATA,
+ 0xff, BIT(0));
+
+ /* set PHY up to 6 Gbps */
+ ahci_berlin_reg_set(ctrl_reg + PORT_VSR_ADDR, 0x225);
+ ahci_berlin_reg_clear_set(ctrl_reg + PORT_VSR_DATA,
+ BIT(11) | BIT(10), BIT(11));
+
+ /* set SEL_BITS to 40 bit */
+ ahci_berlin_reg_set(ctrl_reg + PORT_VSR_ADDR, 0x223);
+ ahci_berlin_reg_clear_set(ctrl_reg + PORT_VSR_DATA,
+ BIT(11) | BIT(10), BIT(11));
+
+ /* use max pll rate */
+ ahci_berlin_reg_set(ctrl_reg + PORT_VSR_ADDR, 0x202);
+ ahci_berlin_reg_setbits(ctrl_reg + PORT_VSR_DATA, BIT(12));
+
+ /* CT timing fix */
+ ahci_berlin_reg_set(ctrl_reg + PORT_VSR_ADDR, BIT(6) | BIT(1));
+ ahci_berlin_reg_set(ctrl_reg + PORT_VSR_ADDR,
+ BIT(15) | BIT(13) | BIT(12) | BIT(11) |
+ BIT(10) | BIT(2) | BIT(1));
+
+ /* set the controller speed */
+ ahci_berlin_reg_set(ctrl_reg + PORT_SCR_CTL,
+ BIT(6) | BIT(5) | BIT(0));
+ }
+
+ /* power up pll */
+ ahci_berlin_reg_set(mmio + HOST_VSA_ADDR, 0x0);
+ ahci_berlin_reg_clear_set(mmio + HOST_VSA_DATA, BIT(6), 0x0);
+}
+
+static const struct ata_port_info ahci_berlin_port_info = {
+ .flags = AHCI_FLAG_COMMON | ATA_FLAG_NCQ,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &ahci_platform_ops,
+};
+
+static int ahci_berlin_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct ahci_host_priv *hpriv;
+ int ret, nports, force_map = 0;
+
+ hpriv = ahci_platform_get_resources(pdev);
+ if (IS_ERR(hpriv)) {
+ dev_err(dev, "cannot get AHCI resources\n");
+ return PTR_ERR(hpriv);
+ }
+
+ ret = ahci_platform_enable_resources(hpriv);
+ if (ret) {
+ dev_err(dev, "cannot enable resources: %d\n", ret);
+ return ret;
+ }
+
+ nports = readl(hpriv->mmio + HOST_PORTS_IMPL);
+
+ /* force_map is modified only if the property is found */
+ of_property_read_u32(np, "marvell,force-port-map", &force_map);
+ if (force_map)
+ nports = force_map;
+
+ ahci_berlin_init(hpriv->mmio);
+ ahci_berlin_port_init(hpriv->mmio, nports);
+
+ ret = ahci_platform_init_host(pdev, hpriv, &ahci_berlin_port_info,
+ force_map, 0);
+ if (ret) {
+ dev_err(dev, "host init failed: %d\n", ret);
+ goto disable_resources;
+ }
+
+ return 0;
+
+disable_resources:
+ ahci_platform_disable_resources(hpriv);
+ return ret;
+}
+
+static const struct of_device_id ahci_berlin_of_match[] = {
+ { .compatible = "marvell,berlin-ahci" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ahci_berlin_of_match);
+
+static struct platform_driver ahci_berlin_driver = {
+ .probe = ahci_berlin_probe,
+ .remove = ata_platform_remove_one,
+ .driver = {
+ .name = "ahci-berlin",
+ .owner = THIS_MODULE,
+ .of_match_table = ahci_berlin_of_match,
+ },
+};
+module_platform_driver(ahci_berlin_driver);
+
+MODULE_DESCRIPTION("Marvell Berlin AHCI SATA driver");
+MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
+MODULE_LICENSE("GPL");
--
1.8.3.2