linux-kernel - [PATCH v3 5/6] MIPS: implement architecture-specific 'pci_remap

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Message-Id: <20210925203224.10419-6-sergio.paracuellos@gmail.com>
Date:   Sat, 25 Sep 2021 22:32:23 +0200
From:   Sergio Paracuellos <sergio.paracuellos@...il.com>
To:     tsbogend@...ha.franken.de
Cc:     robh@...nel.org, arnd@...db.de, catalin.marinas@....com,
        Liviu.Dudau@....com, bhelgaas@...gle.com, matthias.bgg@...il.com,
        gregkh@...uxfoundation.org, linux-mips@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-staging@...ts.linux.dev,
        neil@...wn.name, linux-kernel@...r.kernel.org
Subject: [PATCH v3 5/6] MIPS: implement architecture-specific 'pci_remap_iospace()'

To make PCI IO work we need to properly virtually map IO cpu physical address
and set this virtual address as the address of the first PCI IO port which
is set using function 'set_io_port_base()'.

Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
---
 arch/mips/include/asm/pci.h |  2 ++
 arch/mips/pci/pci-generic.c | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/arch/mips/include/asm/pci.h b/arch/mips/include/asm/pci.h
index 9ffc8192adae..35270984a5f0 100644
--- a/arch/mips/include/asm/pci.h
+++ b/arch/mips/include/asm/pci.h
@@ -20,6 +20,8 @@
 #include <linux/list.h>
 #include <linux/of.h>
 
+#define pci_remap_iospace pci_remap_iospace
+
 #ifdef CONFIG_PCI_DRIVERS_LEGACY
 
 /*
diff --git a/arch/mips/pci/pci-generic.c b/arch/mips/pci/pci-generic.c
index 95b00017886c..18eb8a453a86 100644
--- a/arch/mips/pci/pci-generic.c
+++ b/arch/mips/pci/pci-generic.c
@@ -46,3 +46,17 @@ void pcibios_fixup_bus(struct pci_bus *bus)
 {
 	pci_read_bridge_bases(bus);
 }
+
+int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
+{
+	unsigned long vaddr;
+
+	if (res->start != 0) {
+		WARN_ONCE(1, "resource start address is not zero\n");
+		return -ENODEV;
+	}
+
+	vaddr = (unsigned long)ioremap(phys_addr, resource_size(res));
+	set_io_port_base(vaddr);
+	return 0;
+}
-- 
2.25.1