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>
diff --git a/drivers/ata/ahci_st.c b/drivers/ata/ahci_st.c
new file mode 100644
index 0000000..2f95133
--- /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");