Support xHCI host driver used on Panasonic UniPhier platform.
Signed-off-by: Masahiro Yamada yamada.m@jp.panasonic.com Acked-by: Marek Vasut marex@denx.de ---
Changes in v3: None Changes in v2: - add the error check of fdtdec_get_addr()
doc/README.uniphier | 3 +- drivers/usb/host/Kconfig | 8 ++++ drivers/usb/host/Makefile | 1 + drivers/usb/host/xhci-uniphier.c | 90 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 101 insertions(+), 1 deletion(-) create mode 100644 drivers/usb/host/xhci-uniphier.c
diff --git a/doc/README.uniphier b/doc/README.uniphier index aaeb50c..4902533 100644 --- a/doc/README.uniphier +++ b/doc/README.uniphier @@ -73,7 +73,8 @@ Supported devices
- UART (on-chip) - NAND - - USB (2.0) + - USB 2.0 (EHCI) + - USB 3.0 (xHCI) - LAN (on-board SMSC9118) - I2C - EEPROM (connected to the on-board I2C bus) diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig index 0e005c2..24a595f 100644 --- a/drivers/usb/host/Kconfig +++ b/drivers/usb/host/Kconfig @@ -17,6 +17,14 @@ config USB_XHCI
if USB_XHCI_HCD
+config USB_XHCI_UNIPHIER + bool "Support for Panasonic UniPhier on-chip xHCI USB controller" + depends on ARCH_UNIPHIER + default y + ---help--- + Enables support for the on-chip xHCI controller on Panasonic + UniPhier SoCs. + endif
config USB_EHCI_HCD diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile index 66d6e9a..eb6f34b 100644 --- a/drivers/usb/host/Makefile +++ b/drivers/usb/host/Makefile @@ -48,6 +48,7 @@ obj-$(CONFIG_USB_XHCI_KEYSTONE) += xhci-keystone.o obj-$(CONFIG_USB_XHCI_EXYNOS) += xhci-exynos5.o obj-$(CONFIG_USB_XHCI_OMAP) += xhci-omap.o obj-$(CONFIG_USB_XHCI_PCI) += xhci-pci.o +obj-$(CONFIG_USB_XHCI_UNIPHIER) += xhci-uniphier.o
# designware obj-$(CONFIG_USB_DWC2) += dwc2.o diff --git a/drivers/usb/host/xhci-uniphier.c b/drivers/usb/host/xhci-uniphier.c new file mode 100644 index 0000000..0dbff2d --- /dev/null +++ b/drivers/usb/host/xhci-uniphier.c @@ -0,0 +1,90 @@ +/* + * Copyright (C) 2015 Panasonic Corporation + * Author: Masahiro Yamada yamada.m@jp.panasonic.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <linux/err.h> +#include <usb.h> +#include <fdtdec.h> +#include "xhci.h" + +DECLARE_GLOBAL_DATA_PTR; + +#define FDT gd->fdt_blob +#define COMPAT "panasonic,uniphier-xhci" + +static int get_uniphier_xhci_base(int index, struct xhci_hccr **base) +{ + int offset; + fdt_addr_t addr; + + for (offset = fdt_node_offset_by_compatible(FDT, 0, COMPAT); + offset >= 0; + offset = fdt_node_offset_by_compatible(FDT, offset, COMPAT)) { + if (index == 0) { + addr = fdtdec_get_addr(FDT, offset, "reg"); + if (addr == FDT_ADDR_T_NONE) + return -ENODEV; + + *base = (struct xhci_hccr *)addr; + + return 0; + } + index--; + } + + return -ENODEV; /* not found */ +} + +#define USB3_RST_CTRL 0x00100040 +#define IOMMU_RST_N (1 << 5) +#define LINK_RST_N (1 << 4) + +static void uniphier_xhci_reset(void __iomem *base, int on) +{ + u32 tmp; + + tmp = readl(base + USB3_RST_CTRL); + + if (on) + tmp &= ~(IOMMU_RST_N | LINK_RST_N); + else + tmp |= IOMMU_RST_N | LINK_RST_N; + + writel(tmp, base + USB3_RST_CTRL); +} + +int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor) +{ + int ret; + struct xhci_hccr *cr; + struct xhci_hcor *or; + + ret = get_uniphier_xhci_base(index, &cr); + if (ret < 0) + return ret; + + uniphier_xhci_reset(cr, 0); + + or = (void *)cr + HC_LENGTH(xhci_readl(&cr->cr_capbase)); + + *hccr = cr; + *hcor = or; + + return 0; +} + +void xhci_hcd_stop(int index) +{ + int ret; + struct xhci_hccr *cr; + + ret = get_uniphier_xhci_base(index, &cr); + if (ret < 0) + return; + + uniphier_xhci_reset(cr, 1); +}