MIPS: Loongson64: Switch to generic PCI driver

We can now enable generic PCI driver in Kconfig, and remove legacy
PCI driver code.

Radeon vbios quirk is moved to the platform folder to fit the
new structure.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/Kconfig

@@ -464,6 +464,7 @@ config MACH_LOONGSON64
 	select IRQ_MIPS_CPU
 	select NR_CPUS_DEFAULT_64
 	select USE_GENERIC_EARLY_PRINTK_8250
+	select PCI_DRIVERS_GENERIC
 	select SYS_HAS_CPU_LOONGSON64
 	select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_SMP

arch/mips/loongson64/Makefile

@@ -8,6 +8,6 @@ obj-$(CONFIG_MACH_LOONGSON64) += cop2-ex.o platform.o dma.o \
 obj-$(CONFIG_SMP)	+= smp.o
 obj-$(CONFIG_NUMA)	+= numa.o
 obj-$(CONFIG_RS780_HPET) += hpet.o
-obj-$(CONFIG_PCI) += pci.o
 obj-$(CONFIG_SUSPEND) += pm.o
+obj-$(CONFIG_PCI_QUIRKS) += vbios_quirk.o
 obj-$(CONFIG_CPU_LOONGSON3_CPUCFG_EMULATION) += cpucfg-emul.o

arch/mips/loongson64/vbios_quirk.c

+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/pci.h>
+#include <loongson.h>
+
+static void pci_fixup_radeon(struct pci_dev *pdev)
+{
+	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
+
+	if (res->start)
+		return;
+
+	if (!loongson_sysconf.vgabios_addr)
+		return;
+
+	pci_disable_rom(pdev);
+	if (res->parent)
+		release_resource(res);
+
+	res->start = virt_to_phys((void *) loongson_sysconf.vgabios_addr);
+	res->end   = res->start + 256*1024 - 1;
+	res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
+		     IORESOURCE_PCI_FIXED;
+
+	dev_info(&pdev->dev, "BAR %d: assigned %pR for Radeon ROM\n",
+		 PCI_ROM_RESOURCE, res);
+}
+DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_ATI, 0x9615,
+				PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_radeon);

arch/mips/pci/Makefile

@@ -32,7 +32,6 @@ obj-$(CONFIG_ATH79)		+= fixup-ath79.o
 obj-$(CONFIG_MIPS_COBALT)	+= fixup-cobalt.o
 obj-$(CONFIG_LEMOTE_FULOONG2E)	+= fixup-fuloong2e.o ops-loongson2.o
 obj-$(CONFIG_LEMOTE_MACH2F)	+= fixup-lemote2f.o ops-loongson2.o
-obj-$(CONFIG_MACH_LOONGSON64)	+= fixup-loongson3.o ops-loongson3.o
 obj-$(CONFIG_MIPS_MALTA)	+= fixup-malta.o pci-malta.o
 obj-$(CONFIG_SGI_IP27)		+= pci-ip27.o
 obj-$(CONFIG_SGI_IP32)		+= fixup-ip32.o ops-mace.o pci-ip32.o

arch/mips/pci/fixup-loongson3.c

-/*
- * fixup-loongson3.c
- *
- * Copyright (C) 2012 Lemote, Inc.
- * Author: Xiang Yu, xiangy@lemote.com
- *         Chen Huacai, chenhc@lemote.com
- *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
- *
- * THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
- * WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
- * NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
- * USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#include <linux/pci.h>
-#include <boot_param.h>
-
-static void print_fixup_info(const struct pci_dev *pdev)
-{
-	dev_info(&pdev->dev, "Device %x:%x, irq %d\n",
-			pdev->vendor, pdev->device, pdev->irq);
-}
-
-int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
-{
-	print_fixup_info(dev);
-	return dev->irq;
-}
-
-static void pci_fixup_radeon(struct pci_dev *pdev)
-{
-	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
-
-	if (res->start)
-		return;
-
-	if (!loongson_sysconf.vgabios_addr)
-		return;
-
-	pci_disable_rom(pdev);
-	if (res->parent)
-		release_resource(res);
-
-	res->start = virt_to_phys((void *) loongson_sysconf.vgabios_addr);
-	res->end   = res->start + 256*1024 - 1;
-	res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
-		     IORESOURCE_PCI_FIXED;
-
-	dev_info(&pdev->dev, "BAR %d: assigned %pR for Radeon ROM\n",
-		 PCI_ROM_RESOURCE, res);
-}
-
-DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_ATI, PCI_ANY_ID,
-				PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_radeon);
-
-/* Do platform specific device initialization at pci_enable_device() time */
-int pcibios_plat_dev_init(struct pci_dev *dev)
-{
-	return 0;
-}

arch/mips/pci/ops-loongson3.c

-// SPDX-License-Identifier: GPL-2.0
-#include <linux/types.h>
-#include <linux/pci.h>
-#include <linux/kernel.h>
-
-#include <asm/mips-boards/bonito64.h>
-
-#include <loongson.h>
-
-#define PCI_ACCESS_READ  0
-#define PCI_ACCESS_WRITE 1
-
-#define HT1LO_PCICFG_BASE      0x1a000000
-#define HT1LO_PCICFG_BASE_TP1  0x1b000000
-
-static int loongson3_pci_config_access(unsigned char access_type,
-		struct pci_bus *bus, unsigned int devfn,
-		int where, u32 *data)
-{
-	unsigned char busnum = bus->number;
-	int function = PCI_FUNC(devfn);
-	int device = PCI_SLOT(devfn);
-	int reg = where & ~3;
-	void *addrp;
-	u64 addr;
-
-	if (where < PCI_CFG_SPACE_SIZE) { /* standard config */
-		addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
-		if (busnum == 0) {
-			if (device > 31)
-				return PCIBIOS_DEVICE_NOT_FOUND;
-			addrp = (void *)TO_UNCAC(HT1LO_PCICFG_BASE | addr);
-		} else {
-			addrp = (void *)TO_UNCAC(HT1LO_PCICFG_BASE_TP1 | addr);
-		}
-	} else if (where < PCI_CFG_SPACE_EXP_SIZE) {  /* extended config */
-		struct pci_dev *rootdev;
-
-		rootdev = pci_get_domain_bus_and_slot(0, 0, 0);
-		if (!rootdev)
-			return PCIBIOS_DEVICE_NOT_FOUND;
-
-		addr = pci_resource_start(rootdev, 3);
-		if (!addr)
-			return PCIBIOS_DEVICE_NOT_FOUND;
-
-		addr |= busnum << 20 | device << 15 | function << 12 | reg;
-		addrp = (void *)TO_UNCAC(addr);
-	} else {
-		return PCIBIOS_DEVICE_NOT_FOUND;
-	}
-
-	if (access_type == PCI_ACCESS_WRITE)
-		writel(*data, addrp);
-	else {
-		*data = readl(addrp);
-		if (*data == 0xffffffff) {
-			*data = -1;
-			return PCIBIOS_DEVICE_NOT_FOUND;
-		}
-	}
-	return PCIBIOS_SUCCESSFUL;
-}
-
-static int loongson3_pci_pcibios_read(struct pci_bus *bus, unsigned int devfn,
-				 int where, int size, u32 *val)
-{
-	u32 data = 0;
-	int ret = loongson3_pci_config_access(PCI_ACCESS_READ,
-			bus, devfn, where, &data);
-
-	if (ret != PCIBIOS_SUCCESSFUL)
-		return ret;
-
-	if (size == 1)
-		*val = (data >> ((where & 3) << 3)) & 0xff;
-	else if (size == 2)
-		*val = (data >> ((where & 3) << 3)) & 0xffff;
-	else
-		*val = data;
-
-	return PCIBIOS_SUCCESSFUL;
-}
-
-static int loongson3_pci_pcibios_write(struct pci_bus *bus, unsigned int devfn,
-				  int where, int size, u32 val)
-{
-	u32 data = 0;
-	int ret;
-
-	if (size == 4)
-		data = val;
-	else {
-		ret = loongson3_pci_config_access(PCI_ACCESS_READ,
-				bus, devfn, where, &data);
-		if (ret != PCIBIOS_SUCCESSFUL)
-			return ret;
-
-		if (size == 1)
-			data = (data & ~(0xff << ((where & 3) << 3))) |
-			    (val << ((where & 3) << 3));
-		else if (size == 2)
-			data = (data & ~(0xffff << ((where & 3) << 3))) |
-			    (val << ((where & 3) << 3));
-	}
-
-	ret = loongson3_pci_config_access(PCI_ACCESS_WRITE,
-			bus, devfn, where, &data);
-
-	return ret;
-}
-
-struct pci_ops loongson_pci_ops = {
-	.read = loongson3_pci_pcibios_read,
-	.write = loongson3_pci_pcibios_write
-};