usb: uniphier: remove UniPhier xHCI driver and select DM_USB

This driver has not been converted to Driver Model, and it is an
obstacle to migrate other block device drivers.  Remove it for now.

The UniPhier SoCs already use a DM-based EHCI driver, so now
ARCH_UNIPHIER can select DM_USB.

These two changes must be done atomically because removing the
legacy driver causes a build error.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Marek Vasut <marex@denx.de>

arch/arm/Kconfig

@@ -861,6 +861,7 @@ config ARCH_UNIPHIER
 	select DM_I2C
 	select DM_MMC
 	select DM_SERIAL
+	select DM_USB
 	select OF_CONTROL
 	select OF_LIBFDT
 	select SPL

configs/uniphier_ld4_sld8_defconfig

@@ -32,7 +32,6 @@ CONFIG_SPL_NAND_DENALI=y
 CONFIG_PINCTRL=y
 CONFIG_SPL_PINCTRL=y
 CONFIG_USB=y
-CONFIG_DM_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_EHCI_GENERIC=y
 CONFIG_USB_STORAGE=y

configs/uniphier_sld3_defconfig

@@ -30,7 +30,6 @@ CONFIG_SYS_NAND_DENALI_64BIT=y
 CONFIG_NAND_DENALI_SPARE_AREA_SKIP_BYTES=8
 CONFIG_SPL_NAND_DENALI=y
 CONFIG_USB=y
-CONFIG_DM_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_EHCI_GENERIC=y
 CONFIG_USB_STORAGE=y

drivers/usb/host/Kconfig

@@ -15,13 +15,6 @@ config USB_XHCI_HCD
 
 if USB_XHCI_HCD
 
-config USB_XHCI_UNIPHIER
-	bool "Support for UniPhier on-chip xHCI USB controller"
-	depends on ARCH_UNIPHIER
-	default y
-	---help---
-	  Enables support for the on-chip xHCI controller on UniPhier SoCs.
-
 config USB_XHCI_DWC3
 	bool "DesignWare USB3 DRD Core Support"
 	help

drivers/usb/host/Makefile

@@ -62,7 +62,6 @@ obj-$(CONFIG_USB_XHCI_EXYNOS) += xhci-exynos5.o
 obj-$(CONFIG_USB_XHCI_FSL) += xhci-fsl.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

drivers/usb/host/xhci-uniphier.c

@@ -1,85 +0,0 @@
-/*
- * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <common.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <usb.h>
-#include <fdtdec.h>
-#include "xhci.h"
-
-static int get_uniphier_xhci_base(int index, struct xhci_hccr **base)
-{
-	DECLARE_GLOBAL_DATA_PTR;
-	int node_list[2];
-	fdt_addr_t addr;
-	int count;
-
-	count = fdtdec_find_aliases_for_id(gd->fdt_blob, "usb",
-					   COMPAT_SOCIONEXT_XHCI, node_list,
-					   ARRAY_SIZE(node_list));
-
-	if (index >= count)
-		return -ENODEV;
-
-	addr = fdtdec_get_addr(gd->fdt_blob, node_list[index], "reg");
-	if (addr == FDT_ADDR_T_NONE)
-		return -ENODEV;
-
-	*base = (struct xhci_hccr *)addr;
-
-	return 0;
-}
-
-#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);
-}

include/fdtdec.h

@@ -148,7 +148,6 @@ enum fdt_compat_id {
 	COMPAT_INTEL_MICROCODE,		/* Intel microcode update */
 	COMPAT_AMS_AS3722,		/* AMS AS3722 PMIC */
 	COMPAT_INTEL_QRK_MRC,		/* Intel Quark MRC */
-	COMPAT_SOCIONEXT_XHCI,		/* Socionext UniPhier xHCI */
 	COMPAT_ALTERA_SOCFPGA_DWMAC,	/* SoCFPGA Ethernet controller */
 	COMPAT_ALTERA_SOCFPGA_DWMMC,	/* SoCFPGA DWMMC controller */
 	COMPAT_ALTERA_SOCFPGA_DWC2USB,	/* SoCFPGA DWC2 USB controller */

lib/fdtdec.c

@@ -59,7 +59,6 @@ static const char * const compat_names[COMPAT_COUNT] = {
 	COMPAT(INTEL_MICROCODE, "intel,microcode"),
 	COMPAT(AMS_AS3722, "ams,as3722"),
 	COMPAT(INTEL_QRK_MRC, "intel,quark-mrc"),
-	COMPAT(SOCIONEXT_XHCI, "socionext,uniphier-xhci"),
 	COMPAT(ALTERA_SOCFPGA_DWMAC, "altr,socfpga-stmmac"),
 	COMPAT(ALTERA_SOCFPGA_DWMMC, "altr,socfpga-dw-mshc"),
 	COMPAT(ALTERA_SOCFPGA_DWC2USB, "snps,dwc2"),