linux-kernel - [PATCH 4/4] MIPS: Loongson64: Enable PCI_IO

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Date:   Sun, 26 Apr 2020 19:47:37 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>,
        Paul Burton <paulburton@...nel.org>,
        Stephen Kitt <steve@....org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Philippe Mathieu-Daudé <f4bug@...at.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Daniel Silsby <dansilsby@...il.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Mark Tomlinson <mark.tomlinson@...iedtelesis.co.nz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Allison Randal <allison@...utok.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Wei Xu <xuwei5@...ilicon.com>,
        John Garry <john.garry@...wei.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] MIPS: Loongson64: Enable PCI_IO_VMMAP

Finally we are able to elegantly add I/O ports for PCI host bridge
via devicetree with logic_pio.

To deal with legacy drivers that have fixed I/O ports range we
reserved 0x10000 in PCI_IOBASE, should be enough for i8259 i8042
stuff.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 arch/mips/Kconfig           |  1 +
 arch/mips/include/asm/io.h  |  4 ++++
 arch/mips/loongson64/init.c | 12 ++++++++----
 arch/mips/loongson64/pci.c  |  2 +-
 4 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 4e5308178649..1669735dacd8 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -479,6 +479,7 @@ config MACH_LOONGSON64
 	select I8259
 	select IRQ_MIPS_CPU
 	select NR_CPUS_DEFAULT_64
+	select PCI_IO_VMMAP
 	select USE_GENERIC_EARLY_PRINTK_8250
 	select SYS_HAS_CPU_LOONGSON64
 	select SYS_HAS_EARLY_PRINTK
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index f15ddcd27f35..7f9716c95aa0 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -66,6 +66,10 @@
 #define PCI_IOBASE		((void __iomem *)PCI_IO_START)
 #define IOPORT_RW_BASE		PCI_IO_START
 
+#ifdef CONFIG_MACH_LOONGSON64
+#define MMIO_LOWER_RESERVED	0x10000
+#endif
+
 #else
 
 #define IO_SPACE_LIMIT 0xffff
diff --git a/arch/mips/loongson64/init.c b/arch/mips/loongson64/init.c
index da38944471f4..3117edbbea46 100644
--- a/arch/mips/loongson64/init.c
+++ b/arch/mips/loongson64/init.c
@@ -29,10 +29,6 @@ void __init prom_init(void)
 	fw_init_cmdline();
 	prom_init_env();
 
-	/* init base address of io space */
-	set_io_port_base((unsigned long)
-		ioremap(LOONGSON_PCIIO_BASE, LOONGSON_PCIIO_SIZE));
-
 	prom_init_numa_memory();
 
 	/* Hardcode to CPU UART 0 */
@@ -48,5 +44,13 @@ void __init prom_free_prom_memory(void)
 
 void __init arch_init_irq(void)
 {
+	/*
+	 * i8259 would access I/O space, so mapping must be done here.
+	 * Please remove it when all drivers can be managed by logic_pio.
+	 */
+	ioremap_page_range(PCI_IO_START, PCI_IO_START + MMIO_LOWER_RESERVED,
+				  LOONGSON_PCIIO_BASE,
+				  pgprot_device(PAGE_KERNEL));
+
 	irqchip_init();
 }
diff --git a/arch/mips/loongson64/pci.c b/arch/mips/loongson64/pci.c
index a440a2725a20..7aecb88dd377 100644
--- a/arch/mips/loongson64/pci.c
+++ b/arch/mips/loongson64/pci.c
@@ -37,7 +37,7 @@ extern int sbx00_acpi_init(void);
 static int __init pcibios_init(void)
 {
 
-	loongson_pci_controller.io_map_base = mips_io_port_base;
+	loongson_pci_controller.io_map_base = IOPORT_RW_BASE;
 	loongson_pci_mem_resource.start = loongson_sysconf.pci_mem_start_addr;
 	loongson_pci_mem_resource.end = loongson_sysconf.pci_mem_end_addr;
 
-- 
2.26.0.rc2