Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 274 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-rcar.c b/drivers/usb/host/xhci-rcar.c
new file mode 100644
index 000000000..4ebbe2c23
--- /dev/null
+++ b/drivers/usb/host/xhci-rcar.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * xHCI host controller driver for R-Car SoCs
+ *
+ * Copyright (C) 2014 Renesas Electronics Corporation
+ */
+
+#include <linux/firmware.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/usb/phy.h>
+#include <linux/sys_soc.h>
+
+#include "xhci.h"
+#include "xhci-plat.h"
+#include "xhci-rcar.h"
+
+/*
+* - The V3 firmware is for almost all R-Car Gen3 (except r8a7795 ES1.x)
+* - The V2 firmware is for r8a7795 ES1.x.
+* - The V2 firmware is possible to use on R-Car Gen2. However, the V2 causes
+*   performance degradation. So, this driver continues to use the V1 if R-Car
+*   Gen2.
+* - The V1 firmware is impossible to use on R-Car Gen3.
+*/
+MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V1);
+MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V2);
+MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V3);
+
+/*** Register Offset ***/
+#define RCAR_USB3_AXH_STA	0x104	/* AXI Host Control Status */
+#define RCAR_USB3_INT_ENA	0x224	/* Interrupt Enable */
+#define RCAR_USB3_DL_CTRL	0x250	/* FW Download Control & Status */
+#define RCAR_USB3_FW_DATA0	0x258	/* FW Data0 */
+
+#define RCAR_USB3_LCLK		0xa44	/* LCLK Select */
+#define RCAR_USB3_CONF1		0xa48	/* USB3.0 Configuration1 */
+#define RCAR_USB3_CONF2		0xa5c	/* USB3.0 Configuration2 */
+#define RCAR_USB3_CONF3		0xaa8	/* USB3.0 Configuration3 */
+#define RCAR_USB3_RX_POL	0xab0	/* USB3.0 RX Polarity */
+#define RCAR_USB3_TX_POL	0xab8	/* USB3.0 TX Polarity */
+
+/*** Register Settings ***/
+/* AXI Host Control Status */
+#define RCAR_USB3_AXH_STA_B3_PLL_ACTIVE		0x00010000
+#define RCAR_USB3_AXH_STA_B2_PLL_ACTIVE		0x00000001
+#define RCAR_USB3_AXH_STA_PLL_ACTIVE_MASK (RCAR_USB3_AXH_STA_B3_PLL_ACTIVE | \
+					   RCAR_USB3_AXH_STA_B2_PLL_ACTIVE)
+
+/* Interrupt Enable */
+#define RCAR_USB3_INT_XHC_ENA	0x00000001
+#define RCAR_USB3_INT_PME_ENA	0x00000002
+#define RCAR_USB3_INT_HSE_ENA	0x00000004
+#define RCAR_USB3_INT_ENA_VAL	(RCAR_USB3_INT_XHC_ENA | \
+				RCAR_USB3_INT_PME_ENA | RCAR_USB3_INT_HSE_ENA)
+
+/* FW Download Control & Status */
+#define RCAR_USB3_DL_CTRL_ENABLE	0x00000001
+#define RCAR_USB3_DL_CTRL_FW_SUCCESS	0x00000010
+#define RCAR_USB3_DL_CTRL_FW_SET_DATA0	0x00000100
+
+/* LCLK Select */
+#define RCAR_USB3_LCLK_ENA_VAL	0x01030001
+
+/* USB3.0 Configuration */
+#define RCAR_USB3_CONF1_VAL	0x00030204
+#define RCAR_USB3_CONF2_VAL	0x00030300
+#define RCAR_USB3_CONF3_VAL	0x13802007
+
+/* USB3.0 Polarity */
+#define RCAR_USB3_RX_POL_VAL	BIT(21)
+#define RCAR_USB3_TX_POL_VAL	BIT(4)
+
+/* For soc_device_attribute */
+#define RCAR_XHCI_FIRMWARE_V2   BIT(0) /* FIRMWARE V2 */
+#define RCAR_XHCI_FIRMWARE_V3   BIT(1) /* FIRMWARE V3 */
+
+static const struct soc_device_attribute rcar_quirks_match[]  = {
+	{
+		.soc_id = "r8a7795", .revision = "ES1.*",
+		.data = (void *)RCAR_XHCI_FIRMWARE_V2,
+	},
+	{ /* sentinel */ },
+};
+
+static void xhci_rcar_start_gen2(struct usb_hcd *hcd)
+{
+	/* LCLK Select */
+	writel(RCAR_USB3_LCLK_ENA_VAL, hcd->regs + RCAR_USB3_LCLK);
+	/* USB3.0 Configuration */
+	writel(RCAR_USB3_CONF1_VAL, hcd->regs + RCAR_USB3_CONF1);
+	writel(RCAR_USB3_CONF2_VAL, hcd->regs + RCAR_USB3_CONF2);
+	writel(RCAR_USB3_CONF3_VAL, hcd->regs + RCAR_USB3_CONF3);
+	/* USB3.0 Polarity */
+	writel(RCAR_USB3_RX_POL_VAL, hcd->regs + RCAR_USB3_RX_POL);
+	writel(RCAR_USB3_TX_POL_VAL, hcd->regs + RCAR_USB3_TX_POL);
+}
+
+static int xhci_rcar_is_gen2(struct device *dev)
+{
+	struct device_node *node = dev->of_node;
+
+	return of_device_is_compatible(node, "renesas,xhci-r8a7790") ||
+		of_device_is_compatible(node, "renesas,xhci-r8a7791") ||
+		of_device_is_compatible(node, "renesas,xhci-r8a7793") ||
+		of_device_is_compatible(node, "renesas,rcar-gen2-xhci");
+}
+
+static int xhci_rcar_is_gen3(struct device *dev)
+{
+	struct device_node *node = dev->of_node;
+
+	return of_device_is_compatible(node, "renesas,xhci-r8a7795") ||
+		of_device_is_compatible(node, "renesas,xhci-r8a7796") ||
+		of_device_is_compatible(node, "renesas,rcar-gen3-xhci");
+}
+
+void xhci_rcar_start(struct usb_hcd *hcd)
+{
+	u32 temp;
+
+	if (hcd->regs != NULL) {
+		/* Interrupt Enable */
+		temp = readl(hcd->regs + RCAR_USB3_INT_ENA);
+		temp |= RCAR_USB3_INT_ENA_VAL;
+		writel(temp, hcd->regs + RCAR_USB3_INT_ENA);
+		if (xhci_rcar_is_gen2(hcd->self.controller))
+			xhci_rcar_start_gen2(hcd);
+	}
+}
+
+static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
+{
+	struct device *dev = hcd->self.controller;
+	void __iomem *regs = hcd->regs;
+	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
+	const struct firmware *fw;
+	int retval, index, j, time;
+	int timeout = 10000;
+	u32 data, val, temp;
+	u32 quirks = 0;
+	const struct soc_device_attribute *attr;
+	const char *firmware_name;
+
+	/*
+	 * According to the datasheet, "Upon the completion of FW Download,
+	 * there is no need to write or reload FW".
+	 */
+	if (readl(regs + RCAR_USB3_DL_CTRL) & RCAR_USB3_DL_CTRL_FW_SUCCESS)
+		return 0;
+
+	attr = soc_device_match(rcar_quirks_match);
+	if (attr)
+		quirks = (uintptr_t)attr->data;
+
+	if (quirks & RCAR_XHCI_FIRMWARE_V2)
+		firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2;
+	else if (quirks & RCAR_XHCI_FIRMWARE_V3)
+		firmware_name = XHCI_RCAR_FIRMWARE_NAME_V3;
+	else
+		firmware_name = priv->firmware_name;
+
+	/* request R-Car USB3.0 firmware */
+	retval = request_firmware(&fw, firmware_name, dev);
+	if (retval)
+		return retval;
+
+	/* download R-Car USB3.0 firmware */
+	temp = readl(regs + RCAR_USB3_DL_CTRL);
+	temp |= RCAR_USB3_DL_CTRL_ENABLE;
+	writel(temp, regs + RCAR_USB3_DL_CTRL);
+
+	for (index = 0; index < fw->size; index += 4) {
+		/* to avoid reading beyond the end of the buffer */
+		for (data = 0, j = 3; j >= 0; j--) {
+			if ((j + index) < fw->size)
+				data |= fw->data[index + j] << (8 * j);
+		}
+		writel(data, regs + RCAR_USB3_FW_DATA0);
+		temp = readl(regs + RCAR_USB3_DL_CTRL);
+		temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
+		writel(temp, regs + RCAR_USB3_DL_CTRL);
+
+		for (time = 0; time < timeout; time++) {
+			val = readl(regs + RCAR_USB3_DL_CTRL);
+			if ((val & RCAR_USB3_DL_CTRL_FW_SET_DATA0) == 0)
+				break;
+			udelay(1);
+		}
+		if (time == timeout) {
+			retval = -ETIMEDOUT;
+			break;
+		}
+	}
+
+	temp = readl(regs + RCAR_USB3_DL_CTRL);
+	temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
+	writel(temp, regs + RCAR_USB3_DL_CTRL);
+
+	for (time = 0; time < timeout; time++) {
+		val = readl(regs + RCAR_USB3_DL_CTRL);
+		if (val & RCAR_USB3_DL_CTRL_FW_SUCCESS) {
+			retval = 0;
+			break;
+		}
+		udelay(1);
+	}
+	if (time == timeout)
+		retval = -ETIMEDOUT;
+
+	release_firmware(fw);
+
+	return retval;
+}
+
+static bool xhci_rcar_wait_for_pll_active(struct usb_hcd *hcd)
+{
+	int timeout = 1000;
+	u32 val, mask = RCAR_USB3_AXH_STA_PLL_ACTIVE_MASK;
+
+	while (timeout > 0) {
+		val = readl(hcd->regs + RCAR_USB3_AXH_STA);
+		if ((val & mask) == mask)
+			return true;
+		udelay(1);
+		timeout--;
+	}
+
+	return false;
+}
+
+/* This function needs to initialize a "phy" of usb before */
+int xhci_rcar_init_quirk(struct usb_hcd *hcd)
+{
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+	/* If hcd->regs is NULL, we don't just call the following function */
+	if (!hcd->regs)
+		return 0;
+
+	/*
+	 * On R-Car Gen2 and Gen3, the AC64 bit (bit 0) of HCCPARAMS1 is set
+	 * to 1. However, these SoCs don't support 64-bit address memory
+	 * pointers. So, this driver clears the AC64 bit of xhci->hcc_params
+	 * to call dma_set_coherent_mask(dev, DMA_BIT_MASK(32)) in
+	 * xhci_gen_setup().
+	 *
+	 * And, since the firmware/internal CPU control the USBSTS.STS_HALT
+	 * and the process speed is down when the roothub port enters U3,
+	 * long delay for the handshake of STS_HALT is neeed in xhci_suspend().
+	 */
+	if (xhci_rcar_is_gen2(hcd->self.controller) ||
+			xhci_rcar_is_gen3(hcd->self.controller)) {
+		xhci->quirks |= XHCI_NO_64BIT_SUPPORT | XHCI_SLOW_SUSPEND;
+	}
+
+	if (!xhci_rcar_wait_for_pll_active(hcd))
+		return -ETIMEDOUT;
+
+	xhci->quirks |= XHCI_TRUST_TX_LENGTH;
+	return xhci_rcar_download_firmware(hcd);
+}
+
+int xhci_rcar_resume_quirk(struct usb_hcd *hcd)
+{
+	int ret;
+
+	ret = xhci_rcar_download_firmware(hcd);
+	if (!ret)
+		xhci_rcar_start(hcd);
+
+	return ret;
+}