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Message-ID: <1534227134-151584-3-git-send-email-hanjie.lin@amlogic.com>
Date: Tue, 14 Aug 2018 02:12:14 -0400
From: Hanjie Lin <hanjie.lin@...ogic.com>
To: Kishon Vijay Abraham I <kishon@...com>
CC: Yue Wang <yue.wang@...ogic.com>,
Hanjie Lin <hanjie.lin@...ogic.com>,
<linux-kernel@...r.kernel.org>,
<linux-amlogic@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
"Kevin Hilman" <khilman@...libre.com>,
Carlo Caione <carlo@...one.org>, Rob Herring <robh@...nel.org>,
<shawn.lin@...k-chips.com>
Subject: [PATCH 2/2] PCI: meson: add the Amlogic Meson PCIe phy driver
From: Yue Wang <yue.wang@...ogic.com>
The Meson-PCIE-PHY controller supports the 5-Gbps data rate
of the PCI Express Gen 2 specification and is backwardcompatible
with the 2.5-Gbps Gen 1.1 specification with only
inferred idle detection supported on AMLOGIC SoCs.
Signed-off-by: Yue Wang <yue.wang@...ogic.com>
Signed-off-by: Hanjie Lin <hanjie.lin@...ogic.com>
---
drivers/phy/amlogic/Kconfig | 8 ++
drivers/phy/amlogic/Makefile | 1 +
drivers/phy/amlogic/phy-meson-axg-pcie.c | 160 +++++++++++++++++++++++++++++++
3 files changed, 169 insertions(+)
create mode 100644 drivers/phy/amlogic/phy-meson-axg-pcie.c
diff --git a/drivers/phy/amlogic/Kconfig b/drivers/phy/amlogic/Kconfig
index 23fe1cd..3ab07f9 100644
--- a/drivers/phy/amlogic/Kconfig
+++ b/drivers/phy/amlogic/Kconfig
@@ -36,3 +36,11 @@ config PHY_MESON_GXL_USB3
Enable this to support the Meson USB3 PHY and OTG detection
IP block found in Meson GXL and GXM SoCs.
If unsure, say N.
+
+config PHY_MESON_AXG_PCIE
+ bool "Meson AXG PCIe PHY driver"
+ depends on OF && (ARCH_MESON || COMPILE_TEST)
+ select GENERIC_PHY
+ help
+ Enable PCIe PHY support for Meson AXG SoC series.
+ This driver provides PHY interface for Meson PCIe controller.
\ No newline at end of file
diff --git a/drivers/phy/amlogic/Makefile b/drivers/phy/amlogic/Makefile
index 4fd8848..5ab8578 100644
--- a/drivers/phy/amlogic/Makefile
+++ b/drivers/phy/amlogic/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_PHY_MESON8B_USB2) += phy-meson8b-usb2.o
obj-$(CONFIG_PHY_MESON_GXL_USB2) += phy-meson-gxl-usb2.o
obj-$(CONFIG_PHY_MESON_GXL_USB3) += phy-meson-gxl-usb3.o
+obj-$(CONFIG_PHY_MESON_AXG_PCIE) += phy-meson-axg-pcie.o
diff --git a/drivers/phy/amlogic/phy-meson-axg-pcie.c b/drivers/phy/amlogic/phy-meson-axg-pcie.c
new file mode 100644
index 0000000..8bc5c49
--- /dev/null
+++ b/drivers/phy/amlogic/phy-meson-axg-pcie.c
@@ -0,0 +1,160 @@
+// SPDX-License-Identifier: (GPL-2.0+ or MIT)
+/*
+ * Amlogic MESON SoC series PCIe PHY driver
+ *
+ * Phy provider for PCIe controller on MESON SoC series
+ *
+ * Copyright (c) 2018 Amlogic, inc.
+ * Yue Wang <yue.wang@...ogic.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/reset.h>
+
+struct meson_pcie_phy_data {
+ const struct phy_ops *ops;
+};
+
+struct meson_pcie_reset {
+ struct reset_control *port_a;
+ struct reset_control *port_b;
+ struct reset_control *phy;
+ struct reset_control *apb;
+};
+
+struct meson_pcie_phy {
+ const struct meson_pcie_phy_data *data;
+ struct meson_pcie_reset reset;
+ void __iomem *phy_base;
+};
+
+static int meson_pcie_phy_init(struct phy *phy)
+{
+ struct meson_pcie_phy *mphy = phy_get_drvdata(phy);
+ struct meson_pcie_reset *mrst = &mphy->reset;
+
+ writel(0x1c, mphy->phy_base);
+ reset_control_assert(mrst->port_a);
+ reset_control_assert(mrst->port_b);
+ reset_control_assert(mrst->phy);
+ reset_control_assert(mrst->apb);
+ udelay(400);
+ reset_control_deassert(mrst->port_a);
+ reset_control_deassert(mrst->port_b);
+ reset_control_deassert(mrst->phy);
+ reset_control_deassert(mrst->apb);
+ udelay(500);
+
+ return 0;
+}
+
+static const struct phy_ops meson_phy_ops = {
+ .init = meson_pcie_phy_init,
+ .owner = THIS_MODULE,
+};
+
+static const struct meson_pcie_phy_data meson_pcie_phy_data = {
+ .ops = &meson_phy_ops,
+};
+
+static const struct of_device_id meson_pcie_phy_match[] = {
+ {
+ .compatible = "amlogic,axg-pcie-phy",
+ .data = &meson_pcie_phy_data,
+ },
+ {},
+};
+
+static int meson_pcie_phy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct meson_pcie_phy *mphy;
+ struct meson_pcie_reset *mrst;
+ struct phy *generic_phy;
+ struct phy_provider *phy_provider;
+ struct resource *res;
+ const struct meson_pcie_phy_data *data;
+
+ data = of_device_get_match_data(dev);
+ if (!data)
+ return -ENODEV;
+
+ mphy = devm_kzalloc(dev, sizeof(*mphy), GFP_KERNEL);
+ if (!mphy)
+ return -ENOMEM;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ mphy->phy_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(mphy->phy_base))
+ return PTR_ERR(mphy->phy_base);
+
+ mrst = &mphy->reset;
+
+ mrst->port_a = devm_reset_control_get_shared(dev, "port_a");
+ if (IS_ERR(mrst->port_a)) {
+ if (PTR_ERR(mrst->port_a) != -EPROBE_DEFER)
+ dev_err(dev, "couldn't get port a reset %ld\n",
+ PTR_ERR(mrst->port_a));
+
+ return PTR_ERR(mrst->port_a);
+ }
+
+ mrst->port_b = devm_reset_control_get_shared(dev, "port_b");
+ if (IS_ERR(mrst->port_b)) {
+ if (PTR_ERR(mrst->port_b) != -EPROBE_DEFER)
+ dev_err(dev, "couldn't get port b reset %ld\n",
+ PTR_ERR(mrst->port_b));
+
+ return PTR_ERR(mrst->port_b);
+ }
+
+ mrst->phy = devm_reset_control_get_shared(dev, "phy");
+ if (IS_ERR(mrst->phy)) {
+ if (PTR_ERR(mrst->phy) != -EPROBE_DEFER)
+ dev_err(dev, "couldn't get phy reset\n");
+
+ return PTR_ERR(mrst->phy);
+ }
+
+ mrst->apb = devm_reset_control_get_shared(dev, "apb");
+ if (IS_ERR(mrst->apb)) {
+ if (PTR_ERR(mrst->apb) != -EPROBE_DEFER)
+ dev_err(dev, "couldn't get apb reset\n");
+
+ return PTR_ERR(mrst->apb);
+ }
+
+ reset_control_deassert(mrst->port_a);
+ reset_control_deassert(mrst->port_b);
+ reset_control_deassert(mrst->phy);
+ reset_control_deassert(mrst->apb);
+
+ mphy->data = data;
+
+ generic_phy = devm_phy_create(dev, dev->of_node, mphy->data->ops);
+ if (IS_ERR(generic_phy)) {
+ if (PTR_ERR(generic_phy) != -EPROBE_DEFER)
+ dev_err(dev, "failed to create PHY\n");
+
+ return PTR_ERR(generic_phy);
+ }
+
+ phy_set_drvdata(generic_phy, mphy);
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static struct platform_driver meson_pcie_phy_driver = {
+ .probe = meson_pcie_phy_probe,
+ .driver = {
+ .of_match_table = meson_pcie_phy_match,
+ .name = "meson-pcie-phy",
+ }
+};
+
+builtin_platform_driver(meson_pcie_phy_driver);
--
2.7.4
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