ahci: st: Add support for ST's SATA IP

Acked-by: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

3 files changed, 249 insertions, 0 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 2e6a6f790327..46258ead19aa 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -97,6 +97,15 @@ config SATA_AHCI_PLATFORM
 
           If unsure, say N.
 
+config SATA_AHCI_ST
+        tristate "ST SATA support"
+        depends on SATA_AHCI_PLATFORM
+        select GENERIC_PHY
+        help
+          This option enables support for ST SATA controller.
+
+          If unsure, say N.
+
 config AHCI_IMX
         tristate "Freescale i.MX AHCI SATA support"
         depends on SATA_AHCI_PLATFORM && MFD_SYSCON
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 246050b4c198..6bbd6dadef50 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_ATA)		+= libata.o
 obj-$(CONFIG_SATA_AHCI)         += ahci.o libahci.o
 obj-$(CONFIG_SATA_ACARD_AHCI)   += acard-ahci.o libahci.o
 obj-$(CONFIG_SATA_AHCI_PLATFORM) += ahci_platform.o libahci.o
+obj-$(CONFIG_SATA_AHCI_ST)      += ahci_st.o
 obj-$(CONFIG_SATA_FSL)          += sata_fsl.o
 obj-$(CONFIG_SATA_INIC162X)     += sata_inic162x.o
 obj-$(CONFIG_SATA_SIL24)        += sata_sil24.o
diff --git a/drivers/ata/ahci_st.c b/drivers/ata/ahci_st.c
new file mode 100644
index 000000000000..2f951332227f
--- /dev/null
+++ b/drivers/ata/ahci_st.c
@@ -0,0 +1,239 @@
+/*
+ * Copyright (C) 2012 STMicroelectronics Limited
+ *
+ * Authors: Francesco Virlinzi <francesco.virlinzi@st.com>
+ *          Alexandre Torgue <alexandre.torgue@st.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/export.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/ahci_platform.h>
+#include <linux/phy/phy.h>
+#include <linux/libata.h>
+#include <linux/reset.h>
+#include <linux/io.h>
+#include <linux/dma-mapping.h>
+
+#include "ahci.h"
+
+#define ST_AHCI_OOBR                    0xbc
+#define ST_AHCI_OOBR_WE                 BIT(31)
+#define ST_AHCI_OOBR_CWMIN_SHIFT        24
+#define ST_AHCI_OOBR_CWMAX_SHIFT        16
+#define ST_AHCI_OOBR_CIMIN_SHIFT        8
+#define ST_AHCI_OOBR_CIMAX_SHIFT        0
+
+struct st_ahci_drv_data {
+        struct platform_device *ahci;
+        struct phy *phy;
+        struct reset_control *pwr;
+        struct reset_control *sw_rst;
+        struct reset_control *pwr_rst;
+        struct ahci_host_priv *hpriv;
+};
+
+static void st_ahci_configure_oob(void __iomem *mmio)
+{
+        unsigned long old_val, new_val;
+
+        new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |
+                  (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |
+                  (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |
+                  (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
+
+        old_val = readl(mmio + ST_AHCI_OOBR);
+        writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
+        writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
+        writel(new_val, mmio + ST_AHCI_OOBR);
+}
+
+static int st_ahci_deassert_resets(struct device *dev)
+{
+        struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
+        int err;
+
+        if (drv_data->pwr) {
+                err = reset_control_deassert(drv_data->pwr);
+                if (err) {
+                        dev_err(dev, "unable to bring out of pwrdwn\n");
+                        return err;
+                }
+        }
+
+        st_ahci_configure_oob(drv_data->hpriv->mmio);
+
+        if (drv_data->sw_rst) {
+                err = reset_control_deassert(drv_data->sw_rst);
+                if (err) {
+                        dev_err(dev, "unable to bring out of sw-rst\n");
+                        return err;
+                }
+        }
+
+        if (drv_data->pwr_rst) {
+                err = reset_control_deassert(drv_data->pwr_rst);
+                if (err) {
+                        dev_err(dev, "unable to bring out of pwr-rst\n");
+                        return err;
+                }
+        }
+
+        return 0;
+}
+
+static int st_ahci_probe_resets(struct platform_device *pdev)
+{
+        struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev);
+
+        drv_data->pwr = devm_reset_control_get(&pdev->dev, "pwr-dwn");
+        if (IS_ERR(drv_data->pwr)) {
+                dev_info(&pdev->dev, "power reset control not defined\n");
+                drv_data->pwr = NULL;
+        }
+
+        drv_data->sw_rst = devm_reset_control_get(&pdev->dev, "sw-rst");
+        if (IS_ERR(drv_data->sw_rst)) {
+                dev_info(&pdev->dev, "soft reset control not defined\n");
+                drv_data->sw_rst = NULL;
+        }
+
+        drv_data->pwr_rst = devm_reset_control_get(&pdev->dev, "pwr-rst");
+        if (IS_ERR(drv_data->pwr_rst)) {
+                dev_dbg(&pdev->dev, "power soft reset control not defined\n");
+                drv_data->pwr_rst = NULL;
+        }
+
+        return st_ahci_deassert_resets(&pdev->dev);
+}
+
+static const struct ata_port_info st_ahci_port_info = {
+        .flags          = AHCI_FLAG_COMMON,
+        .pio_mask       = ATA_PIO4,
+        .udma_mask      = ATA_UDMA6,
+        .port_ops       = &ahci_platform_ops,
+};
+
+static int st_ahci_probe(struct platform_device *pdev)
+{
+        struct st_ahci_drv_data *drv_data;
+        struct ahci_host_priv *hpriv;
+        int err;
+
+        drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
+        if (!drv_data)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, drv_data);
+
+        hpriv = ahci_platform_get_resources(pdev);
+        if (IS_ERR(hpriv))
+                return PTR_ERR(hpriv);
+
+        drv_data->hpriv = hpriv;
+
+        err = st_ahci_probe_resets(pdev);
+        if (err)
+                return err;
+
+        err = ahci_platform_enable_resources(hpriv);
+        if (err)
+                return err;
+
+        err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info, 0, 0);
+        if (err) {
+                ahci_platform_disable_resources(hpriv);
+                return err;
+        }
+
+        return 0;
+}
+
+static int st_ahci_remove(struct platform_device *pdev)
+{
+        struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev);
+        struct ahci_host_priv *hpriv = drv_data->hpriv;
+        int err;
+
+        if (drv_data->pwr) {
+                err = reset_control_assert(drv_data->pwr);
+                if (err)
+                        dev_err(&pdev->dev, "unable to pwrdwn\n");
+        }
+
+        ahci_platform_disable_resources(hpriv);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int st_ahci_suspend(struct device *dev)
+{
+        struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
+        struct ahci_host_priv *hpriv = drv_data->hpriv;
+        int err;
+
+        if (drv_data->pwr) {
+                err = reset_control_assert(drv_data->pwr);
+                if (err) {
+                        dev_err(dev, "unable to pwrdwn");
+                        return err;
+                }
+        }
+
+        ahci_platform_disable_resources(hpriv);
+
+        return 0;
+}
+
+static int st_ahci_resume(struct device *dev)
+{
+        struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
+        struct ahci_host_priv *hpriv = drv_data->hpriv;
+        int err;
+
+        err = ahci_platform_enable_resources(hpriv);
+        if (err)
+                return err;
+
+        err = st_ahci_deassert_resets(dev);
+        if (err) {
+                ahci_platform_disable_resources(hpriv);
+                return err;
+        }
+
+        return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
+
+static struct of_device_id st_ahci_match[] = {
+        { .compatible = "st,ahci", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, st_ahci_match);
+
+static struct platform_driver st_ahci_driver = {
+        .driver = {
+                .name = "st_ahci",
+                .owner = THIS_MODULE,
+                .pm = &st_ahci_pm_ops,
+                .of_match_table = of_match_ptr(st_ahci_match),
+        },
+        .probe = st_ahci_probe,
+        .remove = st_ahci_remove,
+};
+module_platform_driver(st_ahci_driver);
+
+MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
+MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics Sata Ahci driver");
+MODULE_LICENSE("GPL v2");