linux-kernel - [PATCH v2 3/3] MIPS: Loongson64: Enable PCI_IO

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Date:   Tue, 28 Apr 2020 10:14:14 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     john.garry@...wei.com, Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>,
        Paul Burton <paulburton@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Stephen Kitt <steve@....org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Daniel Silsby <dansilsby@...il.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Philippe Mathieu-Daudé <f4bug@...at.org>,
        Mark Tomlinson <mark.tomlinson@...iedtelesis.co.nz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Allison Randal <allison@...utok.net>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] 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 +
 .../include/asm/mach-loongson64/loongson.h    |  2 ++
 arch/mips/loongson64/init.c                   | 34 ++++++++++++++++---
 arch/mips/loongson64/pci.c                    |  2 +-
 4 files changed, 34 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/mach-loongson64/loongson.h b/arch/mips/include/asm/mach-loongson64/loongson.h
index fde1b75c45ea..94035a47be5b 100644
--- a/arch/mips/include/asm/mach-loongson64/loongson.h
+++ b/arch/mips/include/asm/mach-loongson64/loongson.h
@@ -86,6 +86,8 @@ extern int mach_i8259_irq(void);
 #define LOONGSON_PCIIO_SIZE	0x00100000	/* 1M */
 #define LOONGSON_PCIIO_TOP	(LOONGSON_PCIIO_BASE+LOONGSON_PCIIO_SIZE-1)
 
+#define MMIO_LOWER_RESERVED	0x10000
+
 /* Loongson Register Bases */
 
 #define LOONGSON_PCICONFIGBASE	0x00
diff --git a/arch/mips/loongson64/init.c b/arch/mips/loongson64/init.c
index da38944471f4..4592eb2f78dd 100644
--- a/arch/mips/loongson64/init.c
+++ b/arch/mips/loongson64/init.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/irqchip.h>
+#include <linux/logic_pio.h>
 #include <linux/memblock.h>
 #include <asm/bootinfo.h>
 #include <asm/traps.h>
@@ -29,10 +30,6 @@ 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 */
@@ -46,7 +43,36 @@ void __init prom_free_prom_memory(void)
 {
 }
 
+static __init void reserve_pio_range(void)
+{
+	struct logic_pio_hwaddr *range;
+
+	range = kzalloc(sizeof(*range), GFP_ATOMIC);
+	if (!range)
+		return;
+
+	range->fwnode = &of_root->fwnode;
+	range->size = MMIO_LOWER_RESERVED;
+	range->hw_start = LOONGSON_PCIIO_BASE;
+	range->flags = LOGIC_PIO_CPU_MMIO;
+
+	if (logic_pio_register_range(range)) {
+		pr_err("Failed to reserve PIO range for legacy ISA\n");
+		kfree(range);
+		return;
+	}
+
+	/*
+	 * 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));
+}
+
 void __init arch_init_irq(void)
 {
+	reserve_pio_range();
 	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