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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/dwc3/dwc3-xilinx.c
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/dwc3/dwc3-xilinx.c')
-rw-r--r--drivers/usb/dwc3/dwc3-xilinx.c405
1 files changed, 405 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c
new file mode 100644
index 000000000..0745e9f11
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-xilinx.c
@@ -0,0 +1,405 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dwc3-xilinx.c - Xilinx DWC3 controller specific glue driver
+ *
+ * Authors: Manish Narani <manish.narani@xilinx.com>
+ * Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/gpio/consumer.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+#include <linux/firmware/xlnx-zynqmp.h>
+#include <linux/io.h>
+
+#include <linux/phy/phy.h>
+
+/* USB phy reset mask register */
+#define XLNX_USB_PHY_RST_EN 0x001C
+#define XLNX_PHY_RST_MASK 0x1
+
+/* Xilinx USB 3.0 IP Register */
+#define XLNX_USB_TRAFFIC_ROUTE_CONFIG 0x005C
+#define XLNX_USB_TRAFFIC_ROUTE_FPD 0x1
+
+/* Versal USB Reset ID */
+#define VERSAL_USB_RESET_ID 0xC104036
+
+#define XLNX_USB_FPD_PIPE_CLK 0x7c
+#define PIPE_CLK_DESELECT 1
+#define PIPE_CLK_SELECT 0
+#define XLNX_USB_FPD_POWER_PRSNT 0x80
+#define FPD_POWER_PRSNT_OPTION BIT(0)
+
+struct dwc3_xlnx {
+ int num_clocks;
+ struct clk_bulk_data *clks;
+ struct device *dev;
+ void __iomem *regs;
+ int (*pltfm_init)(struct dwc3_xlnx *data);
+ struct phy *usb3_phy;
+};
+
+static void dwc3_xlnx_mask_phy_rst(struct dwc3_xlnx *priv_data, bool mask)
+{
+ u32 reg;
+
+ /*
+ * Enable or disable ULPI PHY reset from USB Controller.
+ * This does not actually reset the phy, but just controls
+ * whether USB controller can or cannot reset ULPI PHY.
+ */
+ reg = readl(priv_data->regs + XLNX_USB_PHY_RST_EN);
+
+ if (mask)
+ reg &= ~XLNX_PHY_RST_MASK;
+ else
+ reg |= XLNX_PHY_RST_MASK;
+
+ writel(reg, priv_data->regs + XLNX_USB_PHY_RST_EN);
+}
+
+static int dwc3_xlnx_init_versal(struct dwc3_xlnx *priv_data)
+{
+ struct device *dev = priv_data->dev;
+ int ret;
+
+ dwc3_xlnx_mask_phy_rst(priv_data, false);
+
+ /* Assert and De-assert reset */
+ ret = zynqmp_pm_reset_assert(VERSAL_USB_RESET_ID,
+ PM_RESET_ACTION_ASSERT);
+ if (ret < 0) {
+ dev_err_probe(dev, ret, "failed to assert Reset\n");
+ return ret;
+ }
+
+ ret = zynqmp_pm_reset_assert(VERSAL_USB_RESET_ID,
+ PM_RESET_ACTION_RELEASE);
+ if (ret < 0) {
+ dev_err_probe(dev, ret, "failed to De-assert Reset\n");
+ return ret;
+ }
+
+ dwc3_xlnx_mask_phy_rst(priv_data, true);
+
+ return 0;
+}
+
+static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
+{
+ struct device *dev = priv_data->dev;
+ struct reset_control *crst, *hibrst, *apbrst;
+ struct gpio_desc *reset_gpio;
+ int ret = 0;
+ u32 reg;
+
+ priv_data->usb3_phy = devm_phy_optional_get(dev, "usb3-phy");
+ if (IS_ERR(priv_data->usb3_phy)) {
+ ret = PTR_ERR(priv_data->usb3_phy);
+ dev_err_probe(dev, ret,
+ "failed to get USB3 PHY\n");
+ goto err;
+ }
+
+ /*
+ * The following core resets are not required unless a USB3 PHY
+ * is used, and the subsequent register settings are not required
+ * unless a core reset is performed (they should be set properly
+ * by the first-stage boot loader, but may be reverted by a core
+ * reset). They may also break the configuration if USB3 is actually
+ * in use but the usb3-phy entry is missing from the device tree.
+ * Therefore, skip these operations in this case.
+ */
+ if (!priv_data->usb3_phy)
+ goto skip_usb3_phy;
+
+ crst = devm_reset_control_get_exclusive(dev, "usb_crst");
+ if (IS_ERR(crst)) {
+ ret = PTR_ERR(crst);
+ dev_err_probe(dev, ret,
+ "failed to get core reset signal\n");
+ goto err;
+ }
+
+ hibrst = devm_reset_control_get_exclusive(dev, "usb_hibrst");
+ if (IS_ERR(hibrst)) {
+ ret = PTR_ERR(hibrst);
+ dev_err_probe(dev, ret,
+ "failed to get hibernation reset signal\n");
+ goto err;
+ }
+
+ apbrst = devm_reset_control_get_exclusive(dev, "usb_apbrst");
+ if (IS_ERR(apbrst)) {
+ ret = PTR_ERR(apbrst);
+ dev_err_probe(dev, ret,
+ "failed to get APB reset signal\n");
+ goto err;
+ }
+
+ ret = reset_control_assert(crst);
+ if (ret < 0) {
+ dev_err(dev, "Failed to assert core reset\n");
+ goto err;
+ }
+
+ ret = reset_control_assert(hibrst);
+ if (ret < 0) {
+ dev_err(dev, "Failed to assert hibernation reset\n");
+ goto err;
+ }
+
+ ret = reset_control_assert(apbrst);
+ if (ret < 0) {
+ dev_err(dev, "Failed to assert APB reset\n");
+ goto err;
+ }
+
+ ret = phy_init(priv_data->usb3_phy);
+ if (ret < 0) {
+ phy_exit(priv_data->usb3_phy);
+ goto err;
+ }
+
+ ret = reset_control_deassert(apbrst);
+ if (ret < 0) {
+ dev_err(dev, "Failed to release APB reset\n");
+ goto err;
+ }
+
+ /* Set PIPE Power Present signal in FPD Power Present Register*/
+ writel(FPD_POWER_PRSNT_OPTION, priv_data->regs + XLNX_USB_FPD_POWER_PRSNT);
+
+ /* Set the PIPE Clock Select bit in FPD PIPE Clock register */
+ writel(PIPE_CLK_SELECT, priv_data->regs + XLNX_USB_FPD_PIPE_CLK);
+
+ ret = reset_control_deassert(crst);
+ if (ret < 0) {
+ dev_err(dev, "Failed to release core reset\n");
+ goto err;
+ }
+
+ ret = reset_control_deassert(hibrst);
+ if (ret < 0) {
+ dev_err(dev, "Failed to release hibernation reset\n");
+ goto err;
+ }
+
+ ret = phy_power_on(priv_data->usb3_phy);
+ if (ret < 0) {
+ phy_exit(priv_data->usb3_phy);
+ goto err;
+ }
+
+skip_usb3_phy:
+ /* ulpi reset via gpio-modepin or gpio-framework driver */
+ reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(reset_gpio)) {
+ return dev_err_probe(dev, PTR_ERR(reset_gpio),
+ "Failed to request reset GPIO\n");
+ }
+
+ if (reset_gpio) {
+ /* Toggle ulpi to reset the phy. */
+ gpiod_set_value_cansleep(reset_gpio, 1);
+ usleep_range(5000, 10000);
+ gpiod_set_value_cansleep(reset_gpio, 0);
+ usleep_range(5000, 10000);
+ }
+
+ /*
+ * This routes the USB DMA traffic to go through FPD path instead
+ * of reaching DDR directly. This traffic routing is needed to
+ * make SMMU and CCI work with USB DMA.
+ */
+ if (of_dma_is_coherent(dev->of_node) || device_iommu_mapped(dev)) {
+ reg = readl(priv_data->regs + XLNX_USB_TRAFFIC_ROUTE_CONFIG);
+ reg |= XLNX_USB_TRAFFIC_ROUTE_FPD;
+ writel(reg, priv_data->regs + XLNX_USB_TRAFFIC_ROUTE_CONFIG);
+ }
+
+err:
+ return ret;
+}
+
+static const struct of_device_id dwc3_xlnx_of_match[] = {
+ {
+ .compatible = "xlnx,zynqmp-dwc3",
+ .data = &dwc3_xlnx_init_zynqmp,
+ },
+ {
+ .compatible = "xlnx,versal-dwc3",
+ .data = &dwc3_xlnx_init_versal,
+ },
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, dwc3_xlnx_of_match);
+
+static int dwc3_xlnx_probe(struct platform_device *pdev)
+{
+ struct dwc3_xlnx *priv_data;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ const struct of_device_id *match;
+ void __iomem *regs;
+ int ret;
+
+ priv_data = devm_kzalloc(dev, sizeof(*priv_data), GFP_KERNEL);
+ if (!priv_data)
+ return -ENOMEM;
+
+ regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(regs)) {
+ ret = PTR_ERR(regs);
+ dev_err_probe(dev, ret, "failed to map registers\n");
+ return ret;
+ }
+
+ match = of_match_node(dwc3_xlnx_of_match, pdev->dev.of_node);
+
+ priv_data->pltfm_init = match->data;
+ priv_data->regs = regs;
+ priv_data->dev = dev;
+
+ platform_set_drvdata(pdev, priv_data);
+
+ ret = devm_clk_bulk_get_all(priv_data->dev, &priv_data->clks);
+ if (ret < 0)
+ return ret;
+
+ priv_data->num_clocks = ret;
+
+ ret = clk_bulk_prepare_enable(priv_data->num_clocks, priv_data->clks);
+ if (ret)
+ return ret;
+
+ ret = priv_data->pltfm_init(priv_data);
+ if (ret)
+ goto err_clk_put;
+
+ ret = of_platform_populate(np, NULL, NULL, dev);
+ if (ret)
+ goto err_clk_put;
+
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ pm_suspend_ignore_children(dev, false);
+ pm_runtime_get_sync(dev);
+
+ return 0;
+
+err_clk_put:
+ clk_bulk_disable_unprepare(priv_data->num_clocks, priv_data->clks);
+
+ return ret;
+}
+
+static int dwc3_xlnx_remove(struct platform_device *pdev)
+{
+ struct dwc3_xlnx *priv_data = platform_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+
+ of_platform_depopulate(dev);
+
+ clk_bulk_disable_unprepare(priv_data->num_clocks, priv_data->clks);
+ priv_data->num_clocks = 0;
+
+ pm_runtime_disable(dev);
+ pm_runtime_put_noidle(dev);
+ pm_runtime_set_suspended(dev);
+
+ return 0;
+}
+
+static int __maybe_unused dwc3_xlnx_runtime_suspend(struct device *dev)
+{
+ struct dwc3_xlnx *priv_data = dev_get_drvdata(dev);
+
+ clk_bulk_disable(priv_data->num_clocks, priv_data->clks);
+
+ return 0;
+}
+
+static int __maybe_unused dwc3_xlnx_runtime_resume(struct device *dev)
+{
+ struct dwc3_xlnx *priv_data = dev_get_drvdata(dev);
+
+ return clk_bulk_enable(priv_data->num_clocks, priv_data->clks);
+}
+
+static int __maybe_unused dwc3_xlnx_runtime_idle(struct device *dev)
+{
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_autosuspend(dev);
+
+ return 0;
+}
+
+static int __maybe_unused dwc3_xlnx_suspend(struct device *dev)
+{
+ struct dwc3_xlnx *priv_data = dev_get_drvdata(dev);
+
+ phy_exit(priv_data->usb3_phy);
+
+ /* Disable the clocks */
+ clk_bulk_disable(priv_data->num_clocks, priv_data->clks);
+
+ return 0;
+}
+
+static int __maybe_unused dwc3_xlnx_resume(struct device *dev)
+{
+ struct dwc3_xlnx *priv_data = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_bulk_enable(priv_data->num_clocks, priv_data->clks);
+ if (ret)
+ return ret;
+
+ ret = phy_init(priv_data->usb3_phy);
+ if (ret < 0)
+ return ret;
+
+ ret = phy_power_on(priv_data->usb3_phy);
+ if (ret < 0) {
+ phy_exit(priv_data->usb3_phy);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct dev_pm_ops dwc3_xlnx_dev_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(dwc3_xlnx_suspend, dwc3_xlnx_resume)
+ SET_RUNTIME_PM_OPS(dwc3_xlnx_runtime_suspend,
+ dwc3_xlnx_runtime_resume, dwc3_xlnx_runtime_idle)
+};
+
+static struct platform_driver dwc3_xlnx_driver = {
+ .probe = dwc3_xlnx_probe,
+ .remove = dwc3_xlnx_remove,
+ .driver = {
+ .name = "dwc3-xilinx",
+ .of_match_table = dwc3_xlnx_of_match,
+ .pm = &dwc3_xlnx_dev_pm_ops,
+ },
+};
+
+module_platform_driver(dwc3_xlnx_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Xilinx DWC3 controller specific glue driver");
+MODULE_AUTHOR("Manish Narani <manish.narani@xilinx.com>");
+MODULE_AUTHOR("Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>");