linux-kernel - [PATCH] PCI: mvebu: Use for_each_of_range() iterator for parsing "ranges"

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Message-ID: <20241107153255.2740610-1-robh@kernel.org>
Date: Thu,  7 Nov 2024 09:32:55 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Pali Rohár <pali@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Cc: linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] PCI: mvebu: Use for_each_of_range() iterator for parsing "ranges"

The mvebu "ranges" is a bit unusual with its own encoding of addresses,
but it's still just normal "ranges" as far as parsing is concerned.
Convert mvebu_get_tgt_attr() to use the for_each_of_range() iterator
instead of open coding the parsing.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
Compile tested only.
---
 drivers/pci/controller/pci-mvebu.c | 26 +++++++++-----------------
 1 file changed, 9 insertions(+), 17 deletions(-)

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 29fe09c99e7d..d4e3f1e76f84 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -1179,37 +1179,29 @@ static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
 			      unsigned int *tgt,
 			      unsigned int *attr)
 {
-	const int na = 3, ns = 2;
-	const __be32 *range;
-	int rlen, nranges, rangesz, pna, i;
+	struct of_range range;
+	struct of_range_parser parser;
 
 	*tgt = -1;
 	*attr = -1;
 
-	range = of_get_property(np, "ranges", &rlen);
-	if (!range)
+	if (of_pci_range_parser_init(&parser, np))
 		return -EINVAL;
 
-	pna = of_n_addr_cells(np);
-	rangesz = pna + na + ns;
-	nranges = rlen / sizeof(__be32) / rangesz;
-
-	for (i = 0; i < nranges; i++, range += rangesz) {
-		u32 flags = of_read_number(range, 1);
-		u32 slot = of_read_number(range + 1, 1);
-		u64 cpuaddr = of_read_number(range + na, pna);
+	for_each_of_range(&parser, &range) {
 		unsigned long rtype;
+		u32 slot = upper_32_bits(range.bus_addr);
 
-		if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
+		if (DT_FLAGS_TO_TYPE(range.flags) == DT_TYPE_IO)
 			rtype = IORESOURCE_IO;
-		else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
+		else if (DT_FLAGS_TO_TYPE(range.flags) == DT_TYPE_MEM32)
 			rtype = IORESOURCE_MEM;
 		else
 			continue;
 
 		if (slot == PCI_SLOT(devfn) && type == rtype) {
-			*tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
-			*attr = DT_CPUADDR_TO_ATTR(cpuaddr);
+			*tgt = DT_CPUADDR_TO_TARGET(range.cpu_addr);
+			*attr = DT_CPUADDR_TO_ATTR(range.cpu_addr);
 			return 0;
 		}
 	}
-- 
2.45.2