[PATCH 0/8] Broadcom iProc PCIe fixes and outbound mapping support

[PATCH 0/8] Broadcom iProc PCIe fixes and outbound mapping support

[Ray Jui]

This patch series contains various fixes and outbound mapping support for
the Broadcom iProc PCIe driver. Some of the critical fixes include 1) fix of
PCIe core reset logic and therefore remove its dependency on the bootloader;
2) improved link detection logic that works for more iProc based SoCs.

This patch series also adds the outbound address mapping support. While
outbound address mapping support is not required on chips like North Star,
Cygnus, and etc., some of the newer iProc based chips like North Star 2 require
this support to properly map the AXI address into the address used in the iProc
PCIe core

This patch series is constructed based on Linux v4.3-rc1 (with workaround to
disable calls to pci_read_bridge_bases in pci/probe.c that breaks some of the
ARM based PCIe devices including iProc)

This patch series is tested on the following platforms with an Intel e1000e
based PCIe x1 NIC card:
- ARM32 based Cygnus BCM958305K Wireless Audio board
- ARM64 based North Star 2 SVK board

code available at GITHUB:
https://github.com/Broadcom/cygnus-linux/tree/iproc-pcie-fix-v1

Ray Jui (8):
  PCI: iproc: Fix code comment
  PCI: iproc: Remove unused code
  PCI: iproc: Remove ARCH specific flag
  PCI: iproc: Fix PCIe reset logic
  PCI: iproc: Improve link detection logic
  PCI: iproc: Update iProc PCIe device tree bindings
  PCI: iproc: Add outbound mapping support
  PCI: iproc: Fix compile warnings

 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |  20 +++
 drivers/pci/host/pcie-iproc-platform.c             |  27 ++++
 drivers/pci/host/pcie-iproc.c                      | 159 +++++++++++++++++++--
 drivers/pci/host/pcie-iproc.h                      |  20 ++-
 4 files changed, 210 insertions(+), 16 deletions(-)

-- 
1.9.1

[PATCH 1/8] PCI: iproc: Fix code comment

[Ray Jui]

Fix code comment in pcie-iproc.h so it matches the code

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/pci/host/pcie-iproc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h
index c9e4c10..4880b09 100644
--- a/drivers/pci/host/pcie-iproc.h
+++ b/drivers/pci/host/pcie-iproc.h
@@ -20,11 +20,11 @@
  * iProc PCIe device
  * @dev: pointer to device data structure
  * @base: PCIe host controller I/O register base
- * @resources: linked list of all PCI resources
  * @sysdata: Per PCI controller data (ARM-specific)
  * @root_bus: pointer to root bus
  * @phy: optional PHY device that controls the Serdes
  * @irqs: interrupt IDs
+ * @map_irq: function callback to map interrupts
  */
 struct iproc_pcie {
 	struct device *dev;
-- 
1.9.1

[PATCH 2/8] PCI: iproc: Remove unused code

[Ray Jui]

Remove unused struct iproc_pcie member irqs and #define
IPROC_PCIE_MAX_NUM_IRQS

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/pci/host/pcie-iproc.h | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h
index 4880b09..ecaad57 100644
--- a/drivers/pci/host/pcie-iproc.h
+++ b/drivers/pci/host/pcie-iproc.h
@@ -14,8 +14,6 @@
 #ifndef _PCIE_IPROC_H
 #define _PCIE_IPROC_H
 
-#define IPROC_PCIE_MAX_NUM_IRQS 6
-
 /**
  * iProc PCIe device
  * @dev: pointer to device data structure
@@ -34,7 +32,6 @@ struct iproc_pcie {
 #endif
 	struct pci_bus *root_bus;
 	struct phy *phy;
-	int irqs[IPROC_PCIE_MAX_NUM_IRQS];
 	int (*map_irq)(const struct pci_dev *, u8, u8);
 };
 
-- 
1.9.1

[PATCH 3/8] PCI: iproc: Remove ARCH specific flag

[Ray Jui]

Now setup-irq.o is built for arm64, in 'commit 459a07721c11
("PCI: Build setup-irq.o for arm64")' by Jayachandran, pci_fixup_irqs
can be referenced. We no longer need the CONFIG_ARM flag to wrap
around call to pci_fixup_irqs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/pci/host/pcie-iproc.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index fe2efb1..52e7ff2 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -238,9 +238,7 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
 
 	pci_scan_child_bus(bus);
 	pci_assign_unassigned_bus_resources(bus);
-#ifdef CONFIG_ARM
 	pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
-#endif
 	pci_bus_add_devices(bus);
 
 	return 0;
-- 
1.9.1

[PATCH 4/8] PCI: iproc: Fix PCIe reset logic

[Ray Jui]

The current iProc PCIe reset logic does not always properly reset the
device. For example, in the case when the perst_b signal is already
de-asserted in the bootloader, the current reset logic fails to trigger
a proper asssert -> de-assert reset sequence. This patch fixes the issue
by always triggering the proper reset sequence

This patch also explicitly selects the desired reset source, i.e.,
perst_b and reduces the wait time after the device comes out of reset
from 250 ms to 100 ms, based on recommendation from the ASIC team

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Vladimir Dreizin <vdreizin@broadcom.com>
Reviewed-by: Trac Hoang <trhoang@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Tested-by: Vladimir Dreizin <vdreizin@broadcom.com>
Tested-by: Darren Edamura <dedamura@broadcom.com>
---
 drivers/pci/host/pcie-iproc.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index 52e7ff2..80e0541 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -31,6 +31,8 @@
 #include "pcie-iproc.h"
 
 #define CLK_CONTROL_OFFSET           0x000
+#define EP_PERST_SOURCE_SELECT_SHIFT 2
+#define EP_PERST_SOURCE_SELECT       BIT(EP_PERST_SOURCE_SELECT_SHIFT)
 #define EP_MODE_SURVIVE_PERST_SHIFT  1
 #define EP_MODE_SURVIVE_PERST        BIT(EP_MODE_SURVIVE_PERST_SHIFT)
 #define RC_PCIE_RST_OUTPUT_SHIFT     0
@@ -119,15 +121,18 @@ static void iproc_pcie_reset(struct iproc_pcie *pcie)
 	u32 val;
 
 	/*
-	 * Configure the PCIe controller as root complex and send a downstream
-	 * reset
+	 * Select perst_b signal as reset source. Put the device into reset,
+	 * and then bring it out of reset
 	 */
-	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
+	val = readl(pcie->base + CLK_CONTROL_OFFSET);
+	val &= ~EP_PERST_SOURCE_SELECT & ~EP_MODE_SURVIVE_PERST &
+		~RC_PCIE_RST_OUTPUT;
 	writel(val, pcie->base + CLK_CONTROL_OFFSET);
 	udelay(250);
-	val &= ~EP_MODE_SURVIVE_PERST;
+
+	val |= RC_PCIE_RST_OUTPUT;
 	writel(val, pcie->base + CLK_CONTROL_OFFSET);
-	msleep(250);
+	msleep(100);
 }
 
 static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus)
-- 
1.9.1

[PATCH 5/8] PCI: iproc: Improve link detection logic

[Ray Jui]

This patch further improves the iProc PCIe link detection logic by
explicitly querying the link status register to ensure link is active

It also forces class to PCI_CLASS_BRIDGE_PCI (0x0604) through the host
configuration space register

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pci/host/pcie-iproc.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index 80e0541..62e8085 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -60,6 +60,12 @@
 #define SYS_RC_INTX_EN               0x330
 #define SYS_RC_INTX_MASK             0xf
 
+#define PCIE_LINK_STATUS_OFFSET      0xf0c
+#define PCIE_PHYLINKUP_SHIFT         3
+#define PCIE_PHYLINKUP               BIT(PCIE_PHYLINKUP_SHIFT)
+#define PCIE_DL_ACTIVE_SHIFT         2
+#define PCIE_DL_ACTIVE               BIT(PCIE_DL_ACTIVE_SHIFT)
+
 static inline struct iproc_pcie *iproc_data(struct pci_bus *bus)
 {
 	struct iproc_pcie *pcie;
@@ -138,9 +144,15 @@ static void iproc_pcie_reset(struct iproc_pcie *pcie)
 static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus)
 {
 	u8 hdr_type;
-	u32 link_ctrl;
+	u32 link_ctrl, class, val;
 	u16 pos, link_status;
-	int link_is_active = 0;
+	bool link_is_active = false;
+
+	val = readl(pcie->base + PCIE_LINK_STATUS_OFFSET);
+	if (!(val & PCIE_PHYLINKUP) || !(val & PCIE_DL_ACTIVE)) {
+		dev_err(pcie->dev, "PHY or data link is INACTIVE!\n");
+		return -ENODEV;
+	}
 
 	/* make sure we are not in EP mode */
 	pci_bus_read_config_byte(bus, 0, PCI_HEADER_TYPE, &hdr_type);
@@ -150,14 +162,19 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus)
 	}
 
 	/* force class to PCI_CLASS_BRIDGE_PCI (0x0604) */
-	pci_bus_write_config_word(bus, 0, PCI_CLASS_DEVICE,
-				  PCI_CLASS_BRIDGE_PCI);
+#define PCI_BRIDGE_CTRL_REG_OFFSET 0x43c
+#define PCI_CLASS_BRIDGE_MASK      0xffff00
+#define PCI_CLASS_BRIDGE_SHIFT     8
+	pci_bus_read_config_dword(bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, &class);
+	class &= ~PCI_CLASS_BRIDGE_MASK;
+	class |= (PCI_CLASS_BRIDGE_PCI << PCI_CLASS_BRIDGE_SHIFT);
+	pci_bus_write_config_dword(bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, class);
 
 	/* check link status to see if link is active */
 	pos = pci_bus_find_capability(bus, 0, PCI_CAP_ID_EXP);
 	pci_bus_read_config_word(bus, 0, pos + PCI_EXP_LNKSTA, &link_status);
 	if (link_status & PCI_EXP_LNKSTA_NLW)
-		link_is_active = 1;
+		link_is_active = true;
 
 	if (!link_is_active) {
 		/* try GEN 1 link speed */
@@ -181,7 +198,7 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus)
 			pci_bus_read_config_word(bus, 0, pos + PCI_EXP_LNKSTA,
 						 &link_status);
 			if (link_status & PCI_EXP_LNKSTA_NLW)
-				link_is_active = 1;
+				link_is_active = true;
 		}
 	}
 
-- 
1.9.1

[PATCH 6/8] PCI: iproc: Update iProc PCIe device tree bindings

[Ray Jui]

This patch updates the iProc PCIe device tree bindings with added
support for outbound mapping configurations

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 .../devicetree/bindings/pci/brcm,iproc-pcie.txt      | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
index f7ce50e..45c2a80 100644
--- a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -17,6 +17,21 @@ Optional properties:
 - phys: phandle of the PCIe PHY device
 - phy-names: must be "pcie-phy"
 
+- brcm,pcie-ob: Some iProc SoCs do not have the outbound address mapping done
+by the ASIC after power on reset. In this case, SW needs to configure it
+
+If the brcm,pcie-ob property is present, the following properties become
+effective:
+
+Required:
+- brcm,pcie-ob-axi-offset: The offset from the AXI address to the internal
+address used by the iProc PCIe core (not the PCIe address)
+- brcm,pcie-ob-window-size: The outbound address mapping window size (in MB)
+
+Optional:
+- brcm,pcie-ob-oarr-size: Some iProc SoCs need the OARR size bit to be set to
+increase the outbound window size
+
 Example:
 	pcie0: pcie@18012000 {
 		compatible = "brcm,iproc-pcie";
@@ -38,6 +53,11 @@ Example:
 
 		phys = <&phy 0 5>;
 		phy-names = "pcie-phy";
+
+		brcm,pcie-ob;
+		brcm,pcie-ob-oarr-size;
+		brcm,pcie-ob-axi-offset = <0x00000000>;
+		brcm,pcie-ob-window-size = <256>;
 	};
 
 	pcie1: pcie@18013000 {
-- 
1.9.1

[PATCH 7/8] PCI: iproc: Add outbound mapping support

[Ray Jui]

Certain iProc SoCs require the PCIe outbound mapping to be configured in
SW. This patch adds support for those chips

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/pci/host/pcie-iproc-platform.c |  27 ++++++++
 drivers/pci/host/pcie-iproc.c          | 113 +++++++++++++++++++++++++++++++++
 drivers/pci/host/pcie-iproc.h          |  17 +++++
 3 files changed, 157 insertions(+)

diff --git a/drivers/pci/host/pcie-iproc-platform.c b/drivers/pci/host/pcie-iproc-platform.c
index 9aedc8e..c9550dc 100644
--- a/drivers/pci/host/pcie-iproc-platform.c
+++ b/drivers/pci/host/pcie-iproc-platform.c
@@ -54,6 +54,33 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
+	if (of_property_read_bool(np, "brcm,pcie-ob")) {
+		u32 val;
+
+		ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
+					   &val);
+		if (ret) {
+			dev_err(pcie->dev,
+				"missing brcm,pcie-ob-axi-offset property\n");
+			return ret;
+		}
+		pcie->ob.axi_offset = val;
+
+		ret = of_property_read_u32(np, "brcm,pcie-ob-window-size",
+					   &val);
+		if (ret) {
+			dev_err(pcie->dev,
+				"missing brcm,pcie-ob-window-size property\n");
+			return ret;
+		}
+		pcie->ob.window_size = (resource_size_t)val * SZ_1M;
+
+		if (of_property_read_bool(np, "brcm,pcie-ob-oarr-size"))
+			pcie->ob.set_oarr_size = true;
+
+		pcie->need_ob_cfg = true;
+	}
+
 	/* PHY use is optional */
 	pcie->phy = devm_phy_get(&pdev->dev, "pcie-phy");
 	if (IS_ERR(pcie->phy)) {
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index 62e8085..2ba3c4b 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -66,6 +66,18 @@
 #define PCIE_DL_ACTIVE_SHIFT         2
 #define PCIE_DL_ACTIVE               BIT(PCIE_DL_ACTIVE_SHIFT)
 
+#define OARR_VALID_SHIFT             0
+#define OARR_VALID                   BIT(OARR_VALID_SHIFT)
+#define OARR_SIZE_CFG_SHIFT          1
+#define OARR_SIZE_CFG                BIT(OARR_SIZE_CFG_SHIFT)
+
+#define OARR_LO(window)              (0xd20 + (window) * 8)
+#define OARR_HI(window)              (0xd24 + (window) * 8)
+#define OMAP_LO(window)              (0xd40 + (window) * 8)
+#define OMAP_HI(window)              (0xd44 + (window) * 8)
+
+#define MAX_NUM_OB_WINDOWS           2
+
 static inline struct iproc_pcie *iproc_data(struct pci_bus *bus)
 {
 	struct iproc_pcie *pcie;
@@ -212,6 +224,99 @@ static void iproc_pcie_enable(struct iproc_pcie *pcie)
 	writel(SYS_RC_INTX_MASK, pcie->base + SYS_RC_INTX_EN);
 }
 
+/**
+ * Some iProc SoCs require the SW to configure the outbound address mapping
+ *
+ * Outbound address translation:
+ *
+ * iproc_pcie_address = axi_address - axi_offset
+ * OARR = iproc_pcie_address
+ * OMAP = pci_addr
+ *
+ * axi_addr -> iproc_pcie_address -> OARR -> OMAP -> pci_address
+ */
+static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
+			       u64 pci_addr, resource_size_t size)
+{
+	struct iproc_pcie_ob *ob = &pcie->ob;
+	unsigned i;
+	u64 max_size = (u64)ob->window_size * MAX_NUM_OB_WINDOWS;
+
+	if (size > max_size) {
+		dev_err(pcie->dev,
+			"res size 0x%llx exceeds max supported size 0x%llx\n",
+			(u64)size, max_size);
+		return -EINVAL;
+	}
+
+	if (size % ob->window_size) {
+		dev_err(pcie->dev,
+			"res size 0x%llx needs to be multiple of "
+			"window size 0x%llx\n", (u64)size, ob->window_size);
+		return -EINVAL;
+	}
+
+	if (axi_addr < ob->axi_offset) {
+		dev_err(pcie->dev,
+			"axi address %pap less than offset %pap\n",
+			&axi_addr, &ob->axi_offset);
+		return -EINVAL;
+	}
+
+	/*
+	 * Translate the AXI address to the internal address used by the iProc
+	 * PCIe core before programming the OARR
+	 */
+	axi_addr -= ob->axi_offset;
+
+	for (i = 0; i < MAX_NUM_OB_WINDOWS; i++) {
+		writel(lower_32_bits(axi_addr) | OARR_VALID |
+		       (ob->set_oarr_size ? 1 : 0), pcie->base + OARR_LO(i));
+		writel(upper_32_bits(axi_addr), pcie->base + OARR_HI(i));
+		writel(lower_32_bits(pci_addr), pcie->base + OMAP_LO(i));
+		writel(upper_32_bits(pci_addr), pcie->base + OMAP_HI(i));
+
+		size -= ob->window_size;
+		if (size == 0)
+			break;
+
+		axi_addr += ob->window_size;
+		pci_addr += ob->window_size;
+	}
+
+	return 0;
+}
+
+static int iproc_pcie_map_ranges(struct iproc_pcie *pcie,
+				 struct list_head *resources)
+{
+	struct resource_entry *window;
+	int ret;
+
+	resource_list_for_each_entry(window, resources) {
+		struct resource *res = window->res;
+		u64 res_type = resource_type(res);
+
+		switch (res_type) {
+		case IORESOURCE_IO:
+		case IORESOURCE_BUS:
+			break;
+		case IORESOURCE_MEM:
+			ret = iproc_pcie_setup_ob(pcie, res->start,
+						  res->start - window->offset,
+						  resource_size(res));
+			if (ret)
+				return ret;
+			break;
+		default:
+			dev_err(pcie->dev, "invalid resource %pR\n", res);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
 int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
 {
 	int ret;
@@ -235,6 +340,14 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
 
 	iproc_pcie_reset(pcie);
 
+	if (pcie->need_ob_cfg) {
+		ret = iproc_pcie_map_ranges(pcie, res);
+		if (ret) {
+			dev_err(pcie->dev, "map failed\n");
+			goto err_power_off_phy;
+		}
+	}
+
 #ifdef CONFIG_ARM
 	pcie->sysdata.private_data = pcie;
 	sysdata = &pcie->sysdata;
diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h
index ecaad57..d3dc940 100644
--- a/drivers/pci/host/pcie-iproc.h
+++ b/drivers/pci/host/pcie-iproc.h
@@ -15,6 +15,19 @@
 #define _PCIE_IPROC_H
 
 /**
+ * iProc PCIe outbound mapping
+ * @set_oarr_size: indicates the OARR size bit needs to be set
+ * @axi_offset: offset from the AXI address to the internal address used by
+ * the iProc PCIe core
+ * @window_size: outbound window size
+ */
+struct iproc_pcie_ob {
+	bool set_oarr_size;
+	resource_size_t axi_offset;
+	resource_size_t window_size;
+};
+
+/**
  * iProc PCIe device
  * @dev: pointer to device data structure
  * @base: PCIe host controller I/O register base
@@ -23,6 +36,8 @@
  * @phy: optional PHY device that controls the Serdes
  * @irqs: interrupt IDs
  * @map_irq: function callback to map interrupts
+ * @need_ob_cfg: indidates SW needs to configure the outbound mapping window
+ * @ob: outbound mapping parameters
  */
 struct iproc_pcie {
 	struct device *dev;
@@ -33,6 +48,8 @@ struct iproc_pcie {
 	struct pci_bus *root_bus;
 	struct phy *phy;
 	int (*map_irq)(const struct pci_dev *, u8, u8);
+	bool need_ob_cfg;
+	struct iproc_pcie_ob ob;
 };
 
 int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res);
-- 
1.9.1

[PATCH 8/8] PCI: iproc: Fix compile warnings

[Ray Jui]

There are several compile warnings in pcie-iproc.c related to the
printing of a size_t value.  This is a 32bit value on arm, and 64bit on
arm64.  However, the printks are for 64bit values (thus the warning).
Using the %pap printk for these values (per
Documentation/printk-formats.txt) corrects the issue.

Signed-off-by: Jon Mason <jonmason@broadcom.com>
---
 drivers/pci/host/pcie-iproc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index 2ba3c4b..f3481dd 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -244,15 +244,15 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
 
 	if (size > max_size) {
 		dev_err(pcie->dev,
-			"res size 0x%llx exceeds max supported size 0x%llx\n",
-			(u64)size, max_size);
+			"res size 0x%pap exceeds max supported size 0x%llx\n",
+			&size, max_size);
 		return -EINVAL;
 	}
 
 	if (size % ob->window_size) {
 		dev_err(pcie->dev,
-			"res size 0x%llx needs to be multiple of "
-			"window size 0x%llx\n", (u64)size, ob->window_size);
+			"res size %pap needs to be multiple of window size %pap\n",
+			&size, &ob->window_size);
 		return -EINVAL;
 	}
 
-- 
1.9.1

Re: [PATCH 0/8] Broadcom iProc PCIe fixes and outbound mapping support

[Bjorn Helgaas]

On Tue, Sep 15, 2015 at 05:39:14PM -0700, Ray Jui wrote:
> This patch series contains various fixes and outbound mapping support for
> the Broadcom iProc PCIe driver. Some of the critical fixes include 1) fix of
> PCIe core reset logic and therefore remove its dependency on the bootloader;
> 2) improved link detection logic that works for more iProc based SoCs.
> 
> This patch series also adds the outbound address mapping support. While
> outbound address mapping support is not required on chips like North Star,
> Cygnus, and etc., some of the newer iProc based chips like North Star 2 require
> this support to properly map the AXI address into the address used in the iProc
> PCIe core
> 
> This patch series is constructed based on Linux v4.3-rc1 (with workaround to
> disable calls to pci_read_bridge_bases in pci/probe.c that breaks some of the
> ARM based PCIe devices including iProc)
> 
> This patch series is tested on the following platforms with an Intel e1000e
> based PCIe x1 NIC card:
> - ARM32 based Cygnus BCM958305K Wireless Audio board
> - ARM64 based North Star 2 SVK board
> 
> code available at GITHUB:
> https://github.com/Broadcom/cygnus-linux/tree/iproc-pcie-fix-v1
> 
> Ray Jui (8):
>   PCI: iproc: Fix code comment
>   PCI: iproc: Remove unused code
>   PCI: iproc: Remove ARCH specific flag
>   PCI: iproc: Fix PCIe reset logic
>   PCI: iproc: Improve link detection logic
>   PCI: iproc: Update iProc PCIe device tree bindings
>   PCI: iproc: Add outbound mapping support
>   PCI: iproc: Fix compile warnings
> 
>  .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |  20 +++
>  drivers/pci/host/pcie-iproc-platform.c             |  27 ++++
>  drivers/pci/host/pcie-iproc.c                      | 159 +++++++++++++++++++--
>  drivers/pci/host/pcie-iproc.h                      |  20 ++-
>  4 files changed, 210 insertions(+), 16 deletions(-)

Applied to pci/host-iproc for v4.4, thanks!

Re: [PATCH 7/8] PCI: iproc: Add outbound mapping support

[Kevin Hilman]

On Tue, Sep 15, 2015 at 5:39 PM, Ray Jui <rjui@broadcom.com> wrote:
> Certain iProc SoCs require the PCIe outbound mapping to be configured in
> SW. This patch adds support for those chips
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>

kernelci.org bot found a new build failure in linux-next[1] and it was
bisected down to this patch, which landed in linux-next in the form of
90e4032eeaf2 PCI: iproc: Add outbound mapping support.

The build fails on arm[1] with multi_v7_defconfig and CONFIG_ARM_LPAE=y with:

drivers/built-in.o: In function `iproc_pcie_setup':
:(.text+0x6d874): undefined reference to `__aeabi_uldivmod'

Kevin

[1] http://storage.kernelci.org/next/next-20151013/arm-multi_v7_defconfig+CONFIG_ARM_LPAE=y/build.log

[PATCH] PCI: iproc: fix 32-bit build error

[Arnd Bergmann]

The iproc PCI driver tries to figure out whether the MMIO window has
a valid size, but does this using a 64-bit modulo operation, which
is not allowed on 32-bit kernels and leads to a link error:

drivers/built-in.o: In function `iproc_pcie_setup':
:(.text+0x4b798): undefined reference to `__aeabi_uldivmod'

This works around that error by using the div64_u64() function
provided by the kernel. While this is an expensive operation,
it is harmless because we only call it during the probing
of the driver.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 0ab99ca8eb6c ("PCI: iproc: Fix compile warnings")

diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index f3481ddff344..abcb4be2ee19 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -235,12 +235,13 @@ static void iproc_pcie_enable(struct iproc_pcie *pcie)
  *
  * axi_addr -> iproc_pcie_address -> OARR -> OMAP -> pci_address
  */
-static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
+int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
 			       u64 pci_addr, resource_size_t size)
 {
 	struct iproc_pcie_ob *ob = &pcie->ob;
 	unsigned i;
 	u64 max_size = (u64)ob->window_size * MAX_NUM_OB_WINDOWS;
+	u64 remainder;
 
 	if (size > max_size) {
 		dev_err(pcie->dev,
@@ -249,7 +250,8 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
 		return -EINVAL;
 	}
 
-	if (size % ob->window_size) {
+	div64_u64_rem(size, ob->window_size, &remainder);
+	if (remainder) {
 		dev_err(pcie->dev,
 			"res size %pap needs to be multiple of window size %pap\n",
 			&size, &ob->window_size);

Re: [PATCH] PCI: iproc: fix 32-bit build error

[Hauke Mehrtens]

On 10/13/2015 10:02 PM, Arnd Bergmann wrote:
> The iproc PCI driver tries to figure out whether the MMIO window has
> a valid size, but does this using a 64-bit modulo operation, which
> is not allowed on 32-bit kernels and leads to a link error:
> 
> drivers/built-in.o: In function `iproc_pcie_setup':
> :(.text+0x4b798): undefined reference to `__aeabi_uldivmod'
> 
> This works around that error by using the div64_u64() function
> provided by the kernel. While this is an expensive operation,
> it is harmless because we only call it during the probing
> of the driver.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: 0ab99ca8eb6c ("PCI: iproc: Fix compile warnings")
> 
> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
> index f3481ddff344..abcb4be2ee19 100644
> --- a/drivers/pci/host/pcie-iproc.c
> +++ b/drivers/pci/host/pcie-iproc.c
> @@ -235,12 +235,13 @@ static void iproc_pcie_enable(struct iproc_pcie *pcie)
>   *
>   * axi_addr -> iproc_pcie_address -> OARR -> OMAP -> pci_address
>   */
> -static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
> +int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,

Why are you removing the static here?

>  			       u64 pci_addr, resource_size_t size)
>  {
>  	struct iproc_pcie_ob *ob = &pcie->ob;
>  	unsigned i;
>  	u64 max_size = (u64)ob->window_size * MAX_NUM_OB_WINDOWS;
> +	u64 remainder;
>  
>  	if (size > max_size) {
>  		dev_err(pcie->dev,
> @@ -249,7 +250,8 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
>  		return -EINVAL;
>  	}
>  
> -	if (size % ob->window_size) {
> +	div64_u64_rem(size, ob->window_size, &remainder);
> +	if (remainder) {
>  		dev_err(pcie->dev,
>  			"res size %pap needs to be multiple of window size %pap\n",
>  			&size, &ob->window_size);
> 

Re: [PATCH] PCI: iproc: fix 32-bit build error

[Ray Jui]

On 10/13/2015 1:06 PM, Hauke Mehrtens wrote:
> On 10/13/2015 10:02 PM, Arnd Bergmann wrote:
>> The iproc PCI driver tries to figure out whether the MMIO window has
>> a valid size, but does this using a 64-bit modulo operation, which
>> is not allowed on 32-bit kernels and leads to a link error:
>>
>> drivers/built-in.o: In function `iproc_pcie_setup':
>> :(.text+0x4b798): undefined reference to `__aeabi_uldivmod'
>>
>> This works around that error by using the div64_u64() function
>> provided by the kernel. While this is an expensive operation,
>> it is harmless because we only call it during the probing
>> of the driver.
>>

Thanks, Arnd. Guess I did not see this issue when running on ARM32 based
platforms like Cygnus, because LAPE was not enabled by default for
multi_v7_defconfig. When LAPE is enabled, resource_size_t becomes 64-bit.

>> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>> Fixes: 0ab99ca8eb6c ("PCI: iproc: Fix compile warnings")
>>
>> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
>> index f3481ddff344..abcb4be2ee19 100644
>> --- a/drivers/pci/host/pcie-iproc.c
>> +++ b/drivers/pci/host/pcie-iproc.c
>> @@ -235,12 +235,13 @@ static void iproc_pcie_enable(struct iproc_pcie *pcie)
>>   *
>>   * axi_addr -> iproc_pcie_address -> OARR -> OMAP -> pci_address
>>   */
>> -static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
>> +int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
> 
> Why are you removing the static here?
> 

Yeah we should keep this function as static. The rest of this change
looks good!

>>  			       u64 pci_addr, resource_size_t size)
>>  {
>>  	struct iproc_pcie_ob *ob = &pcie->ob;
>>  	unsigned i;
>>  	u64 max_size = (u64)ob->window_size * MAX_NUM_OB_WINDOWS;
>> +	u64 remainder;
>>  
>>  	if (size > max_size) {
>>  		dev_err(pcie->dev,
>> @@ -249,7 +250,8 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
>>  		return -EINVAL;
>>  	}
>>  
>> -	if (size % ob->window_size) {
>> +	div64_u64_rem(size, ob->window_size, &remainder);
>> +	if (remainder) {
>>  		dev_err(pcie->dev,
>>  			"res size %pap needs to be multiple of window size %pap\n",
>>  			&size, &ob->window_size);
>>
> 

Thanks,

Ray

Re: [PATCH] PCI: iproc: fix 32-bit build error

[Arnd Bergmann]

On Tuesday 13 October 2015 13:11:34 Ray Jui wrote:
> >> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
> >> index f3481ddff344..abcb4be2ee19 100644
> >> --- a/drivers/pci/host/pcie-iproc.c
> >> +++ b/drivers/pci/host/pcie-iproc.c
> >> @@ -235,12 +235,13 @@ static void iproc_pcie_enable(struct iproc_pcie *pcie)
> >>   *
> >>   * axi_addr -> iproc_pcie_address -> OARR -> OMAP -> pci_address
> >>   */
> >> -static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
> >> +int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
> > 
> > Why are you removing the static here?
> > 
> 
> Yeah we should keep this function as static. The rest of this change
> looks good!
> 

Sorry, this accidentally ended up in the patch when I marked the
function as global to track down how the division got called.

I'll send a new version.

	Arnd

Re: [PATCH] PCI: iproc: fix 32-bit build error

[Kevin Hilman]

Arnd Bergmann <arnd@arndb.de> writes:

> The iproc PCI driver tries to figure out whether the MMIO window has
> a valid size, but does this using a 64-bit modulo operation, which
> is not allowed on 32-bit kernels and leads to a link error:
>
> drivers/built-in.o: In function `iproc_pcie_setup':
> :(.text+0x4b798): undefined reference to `__aeabi_uldivmod'
>
> This works around that error by using the div64_u64() function
> provided by the kernel. While this is an expensive operation,
> it is harmless because we only call it during the probing
> of the driver.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: 0ab99ca8eb6c ("PCI: iproc: Fix compile warnings")

Tested-by: Kevin Hilman <khilman@linaro.org>

Verified that this fixes the build failure on arm multi_v7_defconfig +
CONFIG_ARM_LPAE=y on top of next-20151013.

Kevin

Re: [PATCH] PCI: iproc: fix 32-bit build error

[Bjorn Helgaas]

On Tue, Oct 13, 2015 at 11:00:31PM +0200, Arnd Bergmann wrote:
> On Tuesday 13 October 2015 13:11:34 Ray Jui wrote:
> > >> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
> > >> index f3481ddff344..abcb4be2ee19 100644
> > >> --- a/drivers/pci/host/pcie-iproc.c
> > >> +++ b/drivers/pci/host/pcie-iproc.c
> > >> @@ -235,12 +235,13 @@ static void iproc_pcie_enable(struct iproc_pcie *pcie)
> > >>   *
> > >>   * axi_addr -> iproc_pcie_address -> OARR -> OMAP -> pci_address
> > >>   */
> > >> -static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
> > >> +int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
> > > 
> > > Why are you removing the static here?
> > > 
> > 
> > Yeah we should keep this function as static. The rest of this change
> > looks good!
> > 
> 
> Sorry, this accidentally ended up in the patch when I marked the
> function as global to track down how the division got called.
> 
> I'll send a new version.

Ping; I can easily fix up the static, but it'd be nice to have real acks
from Ray and Hauke.

Bjorn

Re: [PATCH] PCI: iproc: fix 32-bit build error

[Ray Jui]

On 10/15/2015 9:00 AM, Bjorn Helgaas wrote:
> On Tue, Oct 13, 2015 at 11:00:31PM +0200, Arnd Bergmann wrote:
>> On Tuesday 13 October 2015 13:11:34 Ray Jui wrote:
>>>>> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
>>>>> index f3481ddff344..abcb4be2ee19 100644
>>>>> --- a/drivers/pci/host/pcie-iproc.c
>>>>> +++ b/drivers/pci/host/pcie-iproc.c
>>>>> @@ -235,12 +235,13 @@ static void iproc_pcie_enable(struct iproc_pcie *pcie)
>>>>>   *
>>>>>   * axi_addr -> iproc_pcie_address -> OARR -> OMAP -> pci_address
>>>>>   */
>>>>> -static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
>>>>> +int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
>>>>
>>>> Why are you removing the static here?
>>>>
>>>
>>> Yeah we should keep this function as static. The rest of this change
>>> looks good!
>>>
>>
>> Sorry, this accidentally ended up in the patch when I marked the
>> function as global to track down how the division got called.
>>
>> I'll send a new version.
> 
> Ping; I can easily fix up the static, but it'd be nice to have real acks
> from Ray and Hauke.
> 
> Bjorn
> 

The current patch looks good to me except that iproc_pcie_setup_ob
should be kept static.

With static added back:
Acked-by: Ray Jui <rjui@broadcom.com>

Thanks,

Ray

[PATCH v2] PCI: iproc: fix 32-bit build error

[Arnd Bergmann]

The iproc PCI driver tries to figure out whether the MMIO window has
a valid size, but does this using a 64-bit modulo operation, which
is not allowed on 32-bit kernels and leads to a link error:

drivers/built-in.o: In function `iproc_pcie_setup':
:(.text+0x4b798): undefined reference to `__aeabi_uldivmod'

This works around that error by using the div64_u64() function
provided by the kernel. While this is an expensive operation,
it is harmless because we only call it during the probing
of the driver.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Ray Jui <rjui@broadcom.com>
Fixes: 0ab99ca8eb6c ("PCI: iproc: Fix compile warnings")

---
On Thursday 15 October 2015 09:19:27 Ray Jui wrote:
> On 10/15/2015 9:00 AM, Bjorn Helgaas wrote:
> > 
> > Ping; I can easily fix up the static, but it'd be nice to have real acks
> > from Ray and Hauke.


Argh, I knew there was one patch from my build fixes that I needed to
redo, I just couldn't find it again. Thanks for the reminder.


diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index f3481ddff344..9193951ae861 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -241,6 +241,7 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
 	struct iproc_pcie_ob *ob = &pcie->ob;
 	unsigned i;
 	u64 max_size = (u64)ob->window_size * MAX_NUM_OB_WINDOWS;
+	u64 remainder;
 
 	if (size > max_size) {
 		dev_err(pcie->dev,
@@ -249,7 +250,8 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
 		return -EINVAL;
 	}
 
-	if (size % ob->window_size) {
+	div64_u64_rem(size, ob->window_size, &remainder);
+	if (remainder) {
 		dev_err(pcie->dev,
 			"res size %pap needs to be multiple of window size %pap\n",
 			&size, &ob->window_size);

Re: [PATCH v2] PCI: iproc: fix 32-bit build error

[Hauke Mehrtens]

On 10/15/2015 09:40 PM, Arnd Bergmann wrote:
> The iproc PCI driver tries to figure out whether the MMIO window has
> a valid size, but does this using a 64-bit modulo operation, which
> is not allowed on 32-bit kernels and leads to a link error:
> 
> drivers/built-in.o: In function `iproc_pcie_setup':
> :(.text+0x4b798): undefined reference to `__aeabi_uldivmod'
> 
> This works around that error by using the div64_u64() function
> provided by the kernel. While this is an expensive operation,
> it is harmless because we only call it during the probing
> of the driver.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Acked-by: Ray Jui <rjui@broadcom.com>

Acked-by: Hauke Mehrtens <hauke@hauke-m.de>

> Fixes: 0ab99ca8eb6c ("PCI: iproc: Fix compile warnings")
> 
> ---
> On Thursday 15 October 2015 09:19:27 Ray Jui wrote:
>> On 10/15/2015 9:00 AM, Bjorn Helgaas wrote:
>>>
>>> Ping; I can easily fix up the static, but it'd be nice to have real acks
>>> from Ray and Hauke.
> 
> 
> Argh, I knew there was one patch from my build fixes that I needed to
> redo, I just couldn't find it again. Thanks for the reminder.
> 
> 
> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
> index f3481ddff344..9193951ae861 100644
> --- a/drivers/pci/host/pcie-iproc.c
> +++ b/drivers/pci/host/pcie-iproc.c
> @@ -241,6 +241,7 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
>  	struct iproc_pcie_ob *ob = &pcie->ob;
>  	unsigned i;
>  	u64 max_size = (u64)ob->window_size * MAX_NUM_OB_WINDOWS;
> +	u64 remainder;
>  
>  	if (size > max_size) {
>  		dev_err(pcie->dev,
> @@ -249,7 +250,8 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
>  		return -EINVAL;
>  	}
>  
> -	if (size % ob->window_size) {
> +	div64_u64_rem(size, ob->window_size, &remainder);
> +	if (remainder) {
>  		dev_err(pcie->dev,
>  			"res size %pap needs to be multiple of window size %pap\n",
>  			&size, &ob->window_size);
> 

Re: [PATCH v2] PCI: iproc: fix 32-bit build error

[Bjorn Helgaas]

On Thu, Oct 15, 2015 at 09:40:45PM +0200, Arnd Bergmann wrote:
> The iproc PCI driver tries to figure out whether the MMIO window has
> a valid size, but does this using a 64-bit modulo operation, which
> is not allowed on 32-bit kernels and leads to a link error:
> 
> drivers/built-in.o: In function `iproc_pcie_setup':
> :(.text+0x4b798): undefined reference to `__aeabi_uldivmod'
> 
> This works around that error by using the div64_u64() function
> provided by the kernel. While this is an expensive operation,
> it is harmless because we only call it during the probing
> of the driver.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Acked-by: Ray Jui <rjui@broadcom.com>
> Fixes: 0ab99ca8eb6c ("PCI: iproc: Fix compile warnings")

This *looks* like it should be fixing 90e4032eeaf2 ("PCI: iproc: Add
outbound mapping support"), not 0ab99ca8eb6c.

90e4032eeaf2 added the "if (size % ob->window_size)".

Is this more subtle than that?

> ---
> On Thursday 15 October 2015 09:19:27 Ray Jui wrote:
> > On 10/15/2015 9:00 AM, Bjorn Helgaas wrote:
> > > 
> > > Ping; I can easily fix up the static, but it'd be nice to have real acks
> > > from Ray and Hauke.
> 
> 
> Argh, I knew there was one patch from my build fixes that I needed to
> redo, I just couldn't find it again. Thanks for the reminder.
> 
> 
> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
> index f3481ddff344..9193951ae861 100644
> --- a/drivers/pci/host/pcie-iproc.c
> +++ b/drivers/pci/host/pcie-iproc.c
> @@ -241,6 +241,7 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
>  	struct iproc_pcie_ob *ob = &pcie->ob;
>  	unsigned i;
>  	u64 max_size = (u64)ob->window_size * MAX_NUM_OB_WINDOWS;
> +	u64 remainder;
>  
>  	if (size > max_size) {
>  		dev_err(pcie->dev,
> @@ -249,7 +250,8 @@ static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
>  		return -EINVAL;
>  	}
>  
> -	if (size % ob->window_size) {
> +	div64_u64_rem(size, ob->window_size, &remainder);
> +	if (remainder) {
>  		dev_err(pcie->dev,
>  			"res size %pap needs to be multiple of window size %pap\n",
>  			&size, &ob->window_size);
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH v2] PCI: iproc: fix 32-bit build error

[Arnd Bergmann]

On Thursday 15 October 2015 16:01:13 Bjorn Helgaas wrote:
> On Thu, Oct 15, 2015 at 09:40:45PM +0200, Arnd Bergmann wrote:
> > The iproc PCI driver tries to figure out whether the MMIO window has
> > a valid size, but does this using a 64-bit modulo operation, which
> > is not allowed on 32-bit kernels and leads to a link error:
> > 
> > drivers/built-in.o: In function `iproc_pcie_setup':
> > :(.text+0x4b798): undefined reference to `__aeabi_uldivmod'
> > 
> > This works around that error by using the div64_u64() function
> > provided by the kernel. While this is an expensive operation,
> > it is harmless because we only call it during the probing
> > of the driver.
> > 
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > Acked-by: Ray Jui <rjui@broadcom.com>
> > Fixes: 0ab99ca8eb6c ("PCI: iproc: Fix compile warnings")
> 
> This *looks* like it should be fixing 90e4032eeaf2 ("PCI: iproc: Add
> outbound mapping support"), not 0ab99ca8eb6c.
> 
> 90e4032eeaf2 added the "if (size % ob->window_size)".
> 
> Is this more subtle than that?
> 
> 

You are absolutely right, I must have copy-pasted the wrong entry.
Do you want me to resend this? I guess you can just remove the
line as this commit has not appeared in any release anyway.

	Arnd

Re: [PATCH v2] PCI: iproc: fix 32-bit build error

[Bjorn Helgaas]

On Fri, Oct 16, 2015 at 11:47:42AM +0200, Arnd Bergmann wrote:
> On Thursday 15 October 2015 16:01:13 Bjorn Helgaas wrote:
> > On Thu, Oct 15, 2015 at 09:40:45PM +0200, Arnd Bergmann wrote:
> > > The iproc PCI driver tries to figure out whether the MMIO window has
> > > a valid size, but does this using a 64-bit modulo operation, which
> > > is not allowed on 32-bit kernels and leads to a link error:
> > > 
> > > drivers/built-in.o: In function `iproc_pcie_setup':
> > > :(.text+0x4b798): undefined reference to `__aeabi_uldivmod'
> > > 
> > > This works around that error by using the div64_u64() function
> > > provided by the kernel. While this is an expensive operation,
> > > it is harmless because we only call it during the probing
> > > of the driver.
> > > 
> > > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > > Acked-by: Ray Jui <rjui@broadcom.com>
> > > Fixes: 0ab99ca8eb6c ("PCI: iproc: Fix compile warnings")
> > 
> > This *looks* like it should be fixing 90e4032eeaf2 ("PCI: iproc: Add
> > outbound mapping support"), not 0ab99ca8eb6c.
> > 
> > 90e4032eeaf2 added the "if (size % ob->window_size)".
> > 
> > Is this more subtle than that?
> 
> You are absolutely right, I must have copy-pasted the wrong entry.
> Do you want me to resend this? I guess you can just remove the
> line as this commit has not appeared in any release anyway.

I squashed this fix and Jon's %pap fix into Ray's original "Add outbound
mapping support" patch and re-did the merge.  Thanks!

Bjorn