linux-kernel - [PATCH v3 2/7] bus: mvebu-mbus: add configuration space aperture

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Message-Id: <20220905192310.22786-3-pali@kernel.org>
Date:   Mon,  5 Sep 2022 21:23:05 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Russell King <linux@...linux.org.uk>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Mauri Sandberg <maukka@....kapsi.fi>
Cc:     linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 2/7] bus: mvebu-mbus: add configuration space aperture

From: Mauri Sandberg <maukka@....kapsi.fi>

Adds a new resource for describing PCI configuration space and accessor for it.

Signed-off-by: Mauri Sandberg <maukka@....kapsi.fi>
Signed-off-by: Pali Rohár <pali@...nel.org>
---
 drivers/bus/mvebu-mbus.c | 26 +++++++++++++++++++++++---
 include/linux/mbus.h     |  1 +
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 5dc2669432ba..9702c6ddbbe6 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -139,6 +139,7 @@ struct mvebu_mbus_state {
 	struct dentry *debugfs_devs;
 	struct resource pcie_mem_aperture;
 	struct resource pcie_io_aperture;
+	struct resource pcie_cfg_aperture;
 	const struct mvebu_mbus_soc_data *soc;
 	int hw_io_coherency;
 
@@ -950,6 +951,14 @@ void mvebu_mbus_get_pcie_io_aperture(struct resource *res)
 }
 EXPORT_SYMBOL_GPL(mvebu_mbus_get_pcie_io_aperture);
 
+void mvebu_mbus_get_pcie_cfg_aperture(struct resource *res)
+{
+	if (!res)
+		return;
+	*res = mbus_state.pcie_cfg_aperture;
+}
+EXPORT_SYMBOL_GPL(mvebu_mbus_get_pcie_cfg_aperture);
+
 int mvebu_mbus_get_dram_win_info(phys_addr_t phyaddr, u8 *target, u8 *attr)
 {
 	const struct mbus_dram_target_info *dram;
@@ -1277,7 +1286,8 @@ static int __init mbus_dt_setup(struct mvebu_mbus_state *mbus,
 
 static void __init mvebu_mbus_get_pcie_resources(struct device_node *np,
 						 struct resource *mem,
-						 struct resource *io)
+						 struct resource *io,
+						 struct resource *cfg)
 {
 	u32 reg[2];
 	int ret;
@@ -1290,6 +1300,8 @@ static void __init mvebu_mbus_get_pcie_resources(struct device_node *np,
 	mem->end = -1;
 	memset(io, 0, sizeof(struct resource));
 	io->end = -1;
+	memset(cfg, 0, sizeof(struct resource));
+	cfg->end = -1;
 
 	ret = of_property_read_u32_array(np, "pcie-mem-aperture", reg, ARRAY_SIZE(reg));
 	if (!ret) {
@@ -1304,6 +1316,13 @@ static void __init mvebu_mbus_get_pcie_resources(struct device_node *np,
 		io->end = io->start + reg[1] - 1;
 		io->flags = IORESOURCE_IO;
 	}
+
+	ret = of_property_read_u32_array(np, "pcie-cfg-aperture", reg, ARRAY_SIZE(reg));
+	if (!ret) {
+		cfg->start = reg[0];
+		cfg->end = cfg->start + reg[1] - 1;
+		cfg->flags = IORESOURCE_MEM;
+	}
 }
 
 int __init mvebu_mbus_dt_init(bool is_coherent)
@@ -1359,9 +1378,10 @@ int __init mvebu_mbus_dt_init(bool is_coherent)
 
 	mbus_state.hw_io_coherency = is_coherent;
 
-	/* Get optional pcie-{mem,io}-aperture properties */
+	/* Get optional pcie-{mem,io,cfg}-aperture properties */
 	mvebu_mbus_get_pcie_resources(np, &mbus_state.pcie_mem_aperture,
-					  &mbus_state.pcie_io_aperture);
+					  &mbus_state.pcie_io_aperture,
+					  &mbus_state.pcie_cfg_aperture);
 
 	ret = mvebu_mbus_common_init(&mbus_state,
 				     mbuswins_res.start,
diff --git a/include/linux/mbus.h b/include/linux/mbus.h
index 4773145246ed..525b56ddd0c2 100644
--- a/include/linux/mbus.h
+++ b/include/linux/mbus.h
@@ -86,6 +86,7 @@ static inline int mvebu_mbus_get_io_win_info(phys_addr_t phyaddr, u32 *size,
 int mvebu_mbus_save_cpu_target(u32 __iomem *store_addr);
 void mvebu_mbus_get_pcie_mem_aperture(struct resource *res);
 void mvebu_mbus_get_pcie_io_aperture(struct resource *res);
+void mvebu_mbus_get_pcie_cfg_aperture(struct resource *res);
 int mvebu_mbus_get_dram_win_info(phys_addr_t phyaddr, u8 *target, u8 *attr);
 int mvebu_mbus_add_window_remap_by_id(unsigned int target,
 				      unsigned int attribute,
-- 
2.20.1