[PATCH 2/2] powerpc: create mpc85xx pci err platform device for EDAC

Creating a platform device for the PCI error registers in order for the
mpc85xx EDAC driver to pick up proper resources. This is to prevent the
EDAC driver from monopolizing the of_device and thus preventing future PCI
code from using the PCI of_device(s).

Signed-off-by: Dave Jiang <redacted>

---
commit 9436d0792f1352e9a034436c82b2229622fc3364
tree 0beeed478786b16cdb33be41ac803f781b8ea0cc
parent 187841bf9dff25e4ac1a7174daa55bb036c724b1
author Dave Jiang <djiang@blade.(none)> Mon, 11 Feb 2008 12:55:45 -0700
committer Dave Jiang <djiang@blade.(none)> Mon, 11 Feb 2008 12:55:45 -0700

 arch/powerpc/sysdev/fsl_pci.c |   52 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 52 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index bf13c21..c064c91 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c

@@ -19,6 +19,8 @@
 #include <linux/string.h>
 #include <linux/init.h>
 #include <linux/bootmem.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
 
 #include <asm/io.h>
 #include <asm/prom.h>

@@ -27,6 +29,56 @@
 #include <sysdev/fsl_soc.h>
 #include <sysdev/fsl_pci.h>
 
+#ifdef CONFIG_85xx
+/* setting up 85xx PCI error platform device for EDAC consumption */
+static int __init mpc85xx_pcierr_setup(void)
+{
+	struct device_node *np = NULL;
+	struct of_device *of_dev;
+	struct platform_device *pdev;
+	struct resource res[2];
+	int id = 0;
+	int err;
+
+	for_each_compatible_node(np, "pci", "fsl,mpc8540-pci") {
+		memset(res, 0, sizeof(struct resource) * 2);
+		if (of_address_to_resource(np, 0, &res[0])) {
+			printk(KERN_WARNING "Can't get pci register base!\n");
+			continue;
+		}
+
+		/* move start to where the error registers are */
+		res[0].start += 0xe00;
+
+		of_irq_to_resource(np, 0, &res[1]);
+
+		of_dev = of_find_device_by_node(np);
+		if (!of_dev)
+			return -ENODEV;
+
+		pdev = platform_device_alloc("mpc85xx_pci_err", id++);
+		if (!pdev)
+			return -ENOMEM;
+
+		err = platform_device_add_resources(pdev, res, 2);
+		if (err)
+			goto error;
+
+		pdev->dev.parent = &of_dev->dev;
+
+		err = platform_device_add(pdev);
+		if (err)
+			goto error;
+	}
+	return 0;
+
+error:
+	platform_device_put(pdev);
+	return err;
+}
+late_initcall(mpc85xx_pcierr_setup);
+#endif
+
 /* atmu setup for fsl pci/pcie controller */
 void __init setup_pci_atmu(struct pci_controller *hose, struct resource *rsrc)
 {

On Feb 11, 2008, at 2:34 PM, Dave Jiang wrote:

Creating a platform device for the PCI error registers in order for  
the
mpc85xx EDAC driver to pick up proper resources. This is to prevent  
the
EDAC driver from monopolizing the of_device and thus preventing  
future PCI
code from using the PCI of_device(s).

Signed-off-by: Dave Jiang <redacted>

I'd rather we didn't add new platform devices, but do this via  
of_platform in the driver itself.

Also, we need to 'rename' the compatible field for some of these  
devices.

- k

Hi Dave,

On Mon, 11 Feb 2008 13:34:45 -0700 Dave Jiang [off-list ref] wrote:

You don't need to initialiase this as it is first used in
for_each_compatible_node().

+	for_each_compatible_node(np, "pci", "fsl,mpc8540-pci") {

+		of_dev = of_find_device_by_node(np);
+		if (!of_dev)
+			return -ENODEV;

You need an of_node_put(np) before you return.

+		pdev = platform_device_alloc("mpc85xx_pci_err", id++);
+		if (!pdev)
+			return -ENOMEM;

And again.

+	}
+	return 0;
+
+error:
+	platform_device_put(pdev);

You need an of_node_put(np) here.

+	return err;
+}

-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au
http://www.canb.auug.org.au/~sfr/

Kumar Gala wrote:

On Feb 11, 2008, at 2:34 PM, Dave Jiang wrote:

quoted

Creating a platform device for the PCI error registers in order for  
the
mpc85xx EDAC driver to pick up proper resources. This is to prevent  
the
EDAC driver from monopolizing the of_device and thus preventing  
future PCI
code from using the PCI of_device(s).

Signed-off-by: Dave Jiang <redacted>

I'd rather we didn't add new platform devices, but do this via  
of_platform in the driver itself.

Kumar,
  Here's the thread of discussion between Arnd Bergmann and I why platform
device is used. The original patch was of_device based....

http://ozlabs.org/pipermail/linuxppc-dev/2007-July/thread.html

Does it still make sense or do I need to go back to of_device?

Also, we need to 'rename' the compatible field for some of these  
devices.

- k

-- 

------------------------------------------------------
Dave Jiang
Software Engineer
MontaVista Software, Inc.
http://www.mvista.com
------------------------------------------------------