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path: root/drivers/usb/phy/phy-samsung-usb.c
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Diffstat (limited to 'drivers/usb/phy/phy-samsung-usb.c')
-rw-r--r--drivers/usb/phy/phy-samsung-usb.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/drivers/usb/phy/phy-samsung-usb.c b/drivers/usb/phy/phy-samsung-usb.c
new file mode 100644
index 000000000000..7b118ee5f5e4
--- /dev/null
+++ b/drivers/usb/phy/phy-samsung-usb.c
@@ -0,0 +1,236 @@
+/* linux/drivers/usb/phy/phy-samsung-usb.c
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Author: Praveen Paneri <p.paneri@samsung.com>
+ *
+ * Samsung USB-PHY helper driver with common function calls;
+ * interacts with Samsung USB 2.0 PHY controller driver and later
+ * with Samsung USB 3.0 PHY driver.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/usb/samsung_usb_phy.h>
+
+#include "phy-samsung-usb.h"
+
+int samsung_usbphy_parse_dt(struct samsung_usbphy *sphy)
+{
+ struct device_node *usbphy_sys;
+
+ /* Getting node for system controller interface for usb-phy */
+ usbphy_sys = of_get_child_by_name(sphy->dev->of_node, "usbphy-sys");
+ if (!usbphy_sys) {
+ dev_err(sphy->dev, "No sys-controller interface for usb-phy\n");
+ return -ENODEV;
+ }
+
+ sphy->pmuregs = of_iomap(usbphy_sys, 0);
+
+ if (sphy->pmuregs == NULL) {
+ dev_err(sphy->dev, "Can't get usb-phy pmu control register\n");
+ goto err0;
+ }
+
+ sphy->sysreg = of_iomap(usbphy_sys, 1);
+
+ /*
+ * Not returning error code here, since this situation is not fatal.
+ * Few SoCs may not have this switch available
+ */
+ if (sphy->sysreg == NULL)
+ dev_warn(sphy->dev, "Can't get usb-phy sysreg cfg register\n");
+
+ of_node_put(usbphy_sys);
+
+ return 0;
+
+err0:
+ of_node_put(usbphy_sys);
+ return -ENXIO;
+}
+EXPORT_SYMBOL_GPL(samsung_usbphy_parse_dt);
+
+/*
+ * Set isolation here for phy.
+ * Here 'on = true' would mean USB PHY block is isolated, hence
+ * de-activated and vice-versa.
+ */
+void samsung_usbphy_set_isolation(struct samsung_usbphy *sphy, bool on)
+{
+ void __iomem *reg = NULL;
+ u32 reg_val;
+ u32 en_mask = 0;
+
+ if (!sphy->pmuregs) {
+ dev_warn(sphy->dev, "Can't set pmu isolation\n");
+ return;
+ }
+
+ switch (sphy->drv_data->cpu_type) {
+ case TYPE_S3C64XX:
+ /*
+ * Do nothing: We will add here once S3C64xx goes for DT support
+ */
+ break;
+ case TYPE_EXYNOS4210:
+ /*
+ * Fall through since exynos4210 and exynos5250 have similar
+ * register architecture: two separate registers for host and
+ * device phy control with enable bit at position 0.
+ */
+ case TYPE_EXYNOS5250:
+ if (sphy->phy_type == USB_PHY_TYPE_DEVICE) {
+ reg = sphy->pmuregs +
+ sphy->drv_data->devphy_reg_offset;
+ en_mask = sphy->drv_data->devphy_en_mask;
+ } else if (sphy->phy_type == USB_PHY_TYPE_HOST) {
+ reg = sphy->pmuregs +
+ sphy->drv_data->hostphy_reg_offset;
+ en_mask = sphy->drv_data->hostphy_en_mask;
+ }
+ break;
+ default:
+ dev_err(sphy->dev, "Invalid SoC type\n");
+ return;
+ }
+
+ reg_val = readl(reg);
+
+ if (on)
+ reg_val &= ~en_mask;
+ else
+ reg_val |= en_mask;
+
+ writel(reg_val, reg);
+}
+EXPORT_SYMBOL_GPL(samsung_usbphy_set_isolation);
+
+/*
+ * Configure the mode of working of usb-phy here: HOST/DEVICE.
+ */
+void samsung_usbphy_cfg_sel(struct samsung_usbphy *sphy)
+{
+ u32 reg;
+
+ if (!sphy->sysreg) {
+ dev_warn(sphy->dev, "Can't configure specified phy mode\n");
+ return;
+ }
+
+ reg = readl(sphy->sysreg);
+
+ if (sphy->phy_type == USB_PHY_TYPE_DEVICE)
+ reg &= ~EXYNOS_USB20PHY_CFG_HOST_LINK;
+ else if (sphy->phy_type == USB_PHY_TYPE_HOST)
+ reg |= EXYNOS_USB20PHY_CFG_HOST_LINK;
+
+ writel(reg, sphy->sysreg);
+}
+EXPORT_SYMBOL_GPL(samsung_usbphy_cfg_sel);
+
+/*
+ * PHYs are different for USB Device and USB Host.
+ * This make sure that correct PHY type is selected before
+ * any operation on PHY.
+ */
+int samsung_usbphy_set_type(struct usb_phy *phy,
+ enum samsung_usb_phy_type phy_type)
+{
+ struct samsung_usbphy *sphy = phy_to_sphy(phy);
+
+ sphy->phy_type = phy_type;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(samsung_usbphy_set_type);
+
+/*
+ * Returns reference clock frequency selection value
+ */
+int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
+{
+ struct clk *ref_clk;
+ int refclk_freq = 0;
+
+ /*
+ * In exynos5250 USB host and device PHY use
+ * external crystal clock XXTI
+ */
+ if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250)
+ ref_clk = devm_clk_get(sphy->dev, "ext_xtal");
+ else
+ ref_clk = devm_clk_get(sphy->dev, "xusbxti");
+ if (IS_ERR(ref_clk)) {
+ dev_err(sphy->dev, "Failed to get reference clock\n");
+ return PTR_ERR(ref_clk);
+ }
+
+ if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250) {
+ /* set clock frequency for PLL */
+ switch (clk_get_rate(ref_clk)) {
+ case 9600 * KHZ:
+ refclk_freq = FSEL_CLKSEL_9600K;
+ break;
+ case 10 * MHZ:
+ refclk_freq = FSEL_CLKSEL_10M;
+ break;
+ case 12 * MHZ:
+ refclk_freq = FSEL_CLKSEL_12M;
+ break;
+ case 19200 * KHZ:
+ refclk_freq = FSEL_CLKSEL_19200K;
+ break;
+ case 20 * MHZ:
+ refclk_freq = FSEL_CLKSEL_20M;
+ break;
+ case 50 * MHZ:
+ refclk_freq = FSEL_CLKSEL_50M;
+ break;
+ case 24 * MHZ:
+ default:
+ /* default reference clock */
+ refclk_freq = FSEL_CLKSEL_24M;
+ break;
+ }
+ } else {
+ switch (clk_get_rate(ref_clk)) {
+ case 12 * MHZ:
+ refclk_freq = PHYCLK_CLKSEL_12M;
+ break;
+ case 24 * MHZ:
+ refclk_freq = PHYCLK_CLKSEL_24M;
+ break;
+ case 48 * MHZ:
+ refclk_freq = PHYCLK_CLKSEL_48M;
+ break;
+ default:
+ if (sphy->drv_data->cpu_type == TYPE_S3C64XX)
+ refclk_freq = PHYCLK_CLKSEL_48M;
+ else
+ refclk_freq = PHYCLK_CLKSEL_24M;
+ break;
+ }
+ }
+ clk_put(ref_clk);
+
+ return refclk_freq;
+}
+EXPORT_SYMBOL_GPL(samsung_usbphy_get_refclk_freq);