| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1409740079-16554-2-git-send-email-peter.griffin@linaro.org>
Date: Wed, 3 Sep 2014 11:27:57 +0100
From: Peter Griffin <peter.griffin@...aro.org>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
srinivas.kandagatla@...il.com, maxime.coquelin@...com,
patrice.chotard@...com, kishon@...com
Cc: peter.griffin@...aro.org, lee.jones@...aro.org,
devicetree@...r.kernel.org,
Giuseppe Cavallaro <peppe.cavallaro@...com>
Subject: [PATCH 1/3] phy: phy-stih407-usb: Add usb picoPHY driver found on stih407 SoC family
This is the generic phy driver for the picoPHY ports used by the
USB2 and USB3 Host controllers available on STiH407 consumer electronic
SoC families available from STMicroelectronics.
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
---
drivers/phy/Kconfig | 8 ++
drivers/phy/Makefile | 2 +
drivers/phy/phy-stih407-usb.c | 185 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 195 insertions(+)
create mode 100644 drivers/phy/phy-stih407-usb.c
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 0dd7427..58018f7 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -230,4 +230,12 @@ config PHY_XGENE
help
This option enables support for APM X-Gene SoC multi-purpose PHY.
+config PHY_STIH407_USB
+ tristate "STMicroelectronics USB2 picoPHY driver for STiH407 family"
+ depends on ARCH_STI
+ depends on GENERIC_PHY
+ help
+ Enable this support to enable the picoPHY device used by USB2
+ and USB3 controllers on STMicroelectronics STiH407 SoC families.
+
endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 95c69ed..c82ac59 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -28,3 +28,5 @@ obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA) += phy-qcom-ipq806x-sata.o
obj-$(CONFIG_PHY_ST_SPEAR1310_MIPHY) += phy-spear1310-miphy.o
obj-$(CONFIG_PHY_ST_SPEAR1340_MIPHY) += phy-spear1340-miphy.o
obj-$(CONFIG_PHY_XGENE) += phy-xgene.o
+obj-$(CONFIG_PHY_STIH407_USB) += phy-stih407-usb.o
+
diff --git a/drivers/phy/phy-stih407-usb.c b/drivers/phy/phy-stih407-usb.c
new file mode 100644
index 0000000..8019e3b
--- /dev/null
+++ b/drivers/phy/phy-stih407-usb.c
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2014 STMicroelectronics
+ *
+ * STMicroelectronics Generic PHY driver for STiH407 USB2.
+ *
+ * Author: Giuseppe Cavallaro <peppe.cavallaro@...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/platform_device.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/clk.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/mfd/syscon.h>
+#include <linux/phy/phy.h>
+
+/* Default PHY_SEL and REFCLKSEL configuration */
+#define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6
+#define STIH407_USB_PICOPHY_CTRL_PORT_MASK 0x1f
+
+/* ports parameters overriding */
+#define STIH407_USB_PICOPHY_PARAM_DEF 0x39a4dc
+#define STIH407_USB_PICOPHY_PARAM_MASK 0xffffffff
+
+struct stih407_usb2_picophy {
+ struct phy *phy;
+ struct regmap *regmap;
+ struct device *dev;
+ struct reset_control *rstc;
+ struct reset_control *rstport;
+ int ctrl;
+ int param;
+};
+
+static int stih407_usb2_pico_ctrl(struct stih407_usb2_picophy *phy_dev)
+{
+ reset_control_deassert(phy_dev->rstc);
+
+ return regmap_update_bits(phy_dev->regmap, phy_dev->ctrl,
+ STIH407_USB_PICOPHY_CTRL_PORT_MASK,
+ STIH407_USB_PICOPHY_CTRL_PORT_CONF);
+}
+
+static int stih407_usb2_init_port(struct phy *phy)
+{
+ int ret;
+ struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy);
+
+ stih407_usb2_pico_ctrl(phy_dev);
+
+ ret = regmap_update_bits(phy_dev->regmap,
+ phy_dev->param,
+ STIH407_USB_PICOPHY_PARAM_MASK,
+ STIH407_USB_PICOPHY_PARAM_DEF);
+ if (ret)
+ return ret;
+
+ return reset_control_deassert(phy_dev->rstport);
+}
+
+static int stih407_usb2_exit_port(struct phy *phy)
+{
+ struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy);
+
+ /*
+ * Only port reset is asserted, phy global reset is kept untouched
+ * as other ports may still be active. When all ports are in reset
+ * state, assumption is made that power will be cut off on the phy, in
+ * case of suspend for instance. Theoretically, asserting individual
+ * reset (like here) or global reset should be equivalent.
+ */
+ return reset_control_assert(phy_dev->rstport);
+}
+
+static const struct phy_ops stih407_usb2_picophy_data = {
+ .init = stih407_usb2_init_port,
+ .exit = stih407_usb2_exit_port,
+ .owner = THIS_MODULE,
+};
+
+static const struct of_device_id stih407_usb2_picophy_of_match[];
+
+static int stih407_usb2_picophy_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+ struct stih407_usb2_picophy *phy_dev;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct phy_provider *phy_provider;
+ struct phy *phy;
+ struct resource *res;
+
+ phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL);
+ if (!phy_dev)
+ return -ENOMEM;
+
+ match = of_match_device(stih407_usb2_picophy_of_match, dev);
+ if (!match)
+ return -ENODEV;
+
+ phy_dev->dev = dev;
+ dev_set_drvdata(dev, phy_dev);
+
+ phy_dev->rstc = devm_reset_control_get(dev, "global");
+ if (IS_ERR(phy_dev->rstc)) {
+ dev_err(dev, "failed to ctrl picoPHY reset\n");
+ return PTR_ERR(phy_dev->rstc);
+ }
+
+ phy_dev->rstport = devm_reset_control_get(dev, "port");
+ if (IS_ERR(phy_dev->rstport)) {
+ dev_err(dev, "failed to ctrl picoPHY reset\n");
+ return PTR_ERR(phy_dev->rstport);
+ }
+
+ /* Reset port by default: only deassert it in phy init */
+ reset_control_assert(phy_dev->rstport);
+
+ phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
+ if (IS_ERR(phy_dev->regmap)) {
+ dev_err(dev, "No syscfg phandle specified\n");
+ return PTR_ERR(phy_dev->regmap);
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
+ if (!res) {
+ dev_err(dev, "No ctrl reg found\n");
+ return -ENXIO;
+ }
+ phy_dev->ctrl = res->start;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "param");
+ if (!res) {
+ dev_err(dev, "No param reg found\n");
+ return -ENXIO;
+ }
+ phy_dev->param = res->start;
+
+ phy = devm_phy_create(dev, NULL, match->data, NULL);
+ if (IS_ERR(phy)) {
+ dev_err(dev, "failed to create Display Port PHY\n");
+ return PTR_ERR(phy);
+ }
+
+ phy_dev->phy = phy;
+ phy_set_drvdata(phy, phy_dev);
+
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+ if (IS_ERR(phy_provider))
+ return PTR_ERR(phy_provider);
+
+ dev_info(dev, "STiH407 USB Generic picoPHY driver probed!");
+
+ return 0;
+}
+
+static const struct of_device_id stih407_usb2_picophy_of_match[] = {
+ { .compatible = "st,stih407-usb2-phy",
+ .data = &stih407_usb2_picophy_data },
+ { /*sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, stih407_usb2_picophy_of_match);
+
+static struct platform_driver stih407_usb2_picophy_driver = {
+ .probe = stih407_usb2_picophy_probe,
+ .driver = {
+ .name = "stih407-usb-genphy",
+ .of_match_table = stih407_usb2_picophy_of_match,
+ }
+};
+
+module_platform_driver(stih407_usb2_picophy_driver);
+
+MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@...com>");
+MODULE_DESCRIPTION("STMicroelectronics Generic picoPHY driver for STiH407");
+MODULE_LICENSE("GPL v2");
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists