Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata

Pull libata updates from Tejun Heo:
 "A lot of activities on libata side this time.

   - A lot of changes around ahci.  Various embedded platforms are
     implementing ahci controllers.  Some were built atop ahci_platform,
     others were doing their own things.  Hans made some structural
     changes to libahci and librarized ahci_platform so that ahci
     platform drivers can share more common code.  A couple platform
     drivers are added on top of that and several are added to replace
     older drivers which were doing their own things (older ones are
     scheduled to be removed).

   - Dan finishes the patchset to make libata PM operations
     asynchronous.  Combined with one patch being routed through scsi,
     this should speed resume measurably.

   - Various fixes and cleanups from Bartlomiej and others"

* 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata: (61 commits)
  ata: fix Marvell SATA driver dependencies
  ata: fix ARASAN CompactFlash PATA driver dependencies
  ata: remove superfluous casts
  ata: sata_highbank: remove superfluous cast
  ata: fix Calxeda Highbank SATA driver dependencies
  ata: fix R-Car SATA driver dependencies
  ARM: davinci: da850: update SATA AHCI support
  ata: add new-style AHCI platform driver for DaVinci DA850 AHCI controller
  ata: move library code from ahci_platform.c to libahci_platform.c
  ata: ahci_platform: fix ahci_platform_data->suspend method handling
  libata: remove unused ata_sas_port_async_resume() stub
  libata.h: add stub for ata_sas_port_resume
  libata: async resume
  libata, libsas: kill pm_result and related cleanup
  ata: Fix compiler warning with APM X-Gene host controller driver
  arm64: Add APM X-Gene SoC AHCI SATA host controller DTS entries
  ata: Add APM X-Gene SoC AHCI SATA host controller driver
  Documentation: Add documentation for the APM X-Gene SoC SATA host controller DTS binding
  arm64: Add APM X-Gene SoC 15Gbps Multi-purpose PHY DTS entries
  ata: ahci_sunxi: fix code formatting
  ...

1 files changed, 245 insertions, 0 deletions

diff --git a/drivers/ata/ahci_st.c b/drivers/ata/ahci_st.c
new file mode 100644
index 000000000000..633222226c19
--- /dev/null
+++ b/drivers/ata/ahci_st.c
@@ -0,0 +1,245 @@
+/*
+ * 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/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 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 void st_ahci_host_stop(struct ata_host *host)
+{
+	struct ahci_host_priv *hpriv = host->private_data;
+	struct device *dev = host->dev;
+	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
+	int err;
+
+	if (drv_data->pwr) {
+		err = reset_control_assert(drv_data->pwr);
+		if (err)
+			dev_err(dev, "unable to pwrdwn\n");
+	}
+
+	ahci_platform_disable_resources(hpriv);
+}
+
+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 struct ata_port_operations st_ahci_port_ops = {
+	.inherits	= &ahci_platform_ops,
+	.host_stop	= st_ahci_host_stop,
+};
+
+static const struct ata_port_info st_ahci_port_info = {
+	.flags          = AHCI_FLAG_COMMON,
+	.pio_mask       = ATA_PIO4,
+	.udma_mask      = ATA_UDMA6,
+	.port_ops       = &st_ahci_port_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;
+}
+
+#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;
+
+	err = ahci_platform_suspend_host(dev);
+	if (err)
+		return 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 ahci_platform_resume_host(dev);
+}
+#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 = ata_platform_remove_one,
+};
+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");