linux-kernel - [PATCH 1/5] arm: ioremap: Implement standard PCI function pci_remap

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Message-Id: <20211124154116.916-2-pali@kernel.org>
Date:   Wed, 24 Nov 2021 16:41:12 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Russell King <linux@...linux.org.uk>, Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Marek Behún <kabel@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] arm: ioremap: Implement standard PCI function pci_remap_iospace()

pci_remap_iospace() is standard PCI core function. Architecture code can
reimplement default core implementation if needs custom arch specific
functionality.

ARM needs custom implementation due to pci_ioremap_set_mem_type() hook
which allows ARM platforms to change mem type for iospace.

Implement this pci_remap_iospace() function for ARM architecture to
correctly handle pci_ioremap_set_mem_type() hook, which allows usage of
this standard PCI core function also for platforms which needs different
mem type (e.g. Marvell Armada 375, 38x and 39x).

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 arch/arm/include/asm/io.h |  5 +++++
 arch/arm/mm/ioremap.c     | 15 +++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index c576fa7d9bf8..12eca75bdee9 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -182,6 +182,11 @@ static inline void pci_ioremap_set_mem_type(int mem_type) {}
 
 extern int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr);
 
+struct resource;
+
+#define pci_remap_iospace pci_remap_iospace
+int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr);
+
 /*
  * PCI configuration space mapping function.
  *
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index 6e830b9418c9..fa3bde48d6a7 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -459,6 +459,21 @@ void pci_ioremap_set_mem_type(int mem_type)
 	pci_ioremap_mem_type = mem_type;
 }
 
+int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
+{
+	unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start;
+
+	if (!(res->flags & IORESOURCE_IO))
+		return -EINVAL;
+
+	if (res->end > IO_SPACE_LIMIT)
+		return -EINVAL;
+
+	return ioremap_page_range(vaddr, vaddr + resource_size(res), phys_addr,
+				  __pgprot(get_mem_type(pci_ioremap_mem_type)->prot_pte));
+}
+EXPORT_SYMBOL(pci_remap_iospace);
+
 int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr)
 {
 	BUG_ON(offset + SZ_64K - 1 > IO_SPACE_LIMIT);
-- 
2.20.1