Hi Russell,
I attached the update one.
From: ext Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>
Subject: Re: [PATCH 3/6] omap iommu: omap3 iommu device registration
Date: Sat, 17 Jan 2009 17:21:39 +0100
> On Fri, Jan 16, 2009 at 10:37:20AM +0200, Hiroshi DOYU wrote:
> > +#include <linux/io.h>
>
> Is linux/io.h needed, or will a more specific include be better?
>
> > +#include <linux/platform_device.h>
> > +
> > +#include <mach/iommu.h>
> > +
> > +#define DEVNAME "omap-iommu"
>
> I'm not sure this DEVNAME definition really helps anything.
>
> > +static void omap3_iommu_release(struct device *dev)
> > +{
> > +}
>
> Err, no. Never ever ever provide a NULL release function. Providing
> such a function is a screaming message that what you're doing is buggy.
>
> And if you get a warning through not providing such a function, it's
> telling you that what your overall approach with the driver API is
> buggy (and you haven't understood the implications of refcounted
> object management.)
>
> > +
> > +static struct platform_device omap3_iommu_pdev[] = {
> > + {
> > + .name = DEVNAME,
> > + .id = 1,
> > + .num_resources = ARRAY_SIZE(iommu1_res),
> > + .resource = iommu1_res,
> > + .dev = {
> > + .release = omap3_iommu_release,
> > + .platform_data = &omap3_iommu_pdata[0],
> > + },
> > + },
> > + {
> > + .name = DEVNAME,
> > + .id = 2,
> > + .num_resources = ARRAY_SIZE(iommu2_res),
> > + .resource = iommu2_res,
> > + .dev = {
> > + .release = omap3_iommu_release,
> > + .platform_data = &omap3_iommu_pdata[1],
> > + },
> > + },
> > +};
> > +
> > +static int __init omap3_iommu_init(void)
> > +{
> > + int i;
> > + for (i = 0; i < ARRAY_SIZE(omap3_iommu_pdev); i++)
> > + platform_device_register(&omap3_iommu_pdev[i]);
> > + return 0;
> > +}
> > +module_init(omap3_iommu_init);
> > +
> > +static void __exit omap3_iommu_exit(void)
> > +{
> > + int i;
> > + for (i = 0; i < ARRAY_SIZE(omap3_iommu_pdev); i++)
> > + platform_device_unregister(&omap3_iommu_pdev[i]);
>
> So... this can never be bug free - you can _never_ unregister statically
> allocated devices. Not even if you provide an empty release function.
>
> If you want to register and unregister device structures, it must be
> done using the correct APIs, and in the case of platform devices, that's
> the platform_device_alloc(), platform_device_add() and
> platform_device_unregister() APIs.
>From 5b61d40f516d7df3a597df5bd798cb06df01fb28 Mon Sep 17 00:00:00 2001
From: Hiroshi DOYU <Hiroshi.DOYU@xxxxxxxxx>
Date: Tue, 27 Jan 2009 22:46:36 +0200
Subject: [PATCH 3/6] omap iommu: omap3 iommu device registration
Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@xxxxxxxxx>
---
arch/arm/mach-omap2/omap3-iommu.c | 103 +++++++++++++++++++++++++++++++++++++
1 files changed, 103 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-omap2/omap3-iommu.c
diff --git a/arch/arm/mach-omap2/omap3-iommu.c b/arch/arm/mach-omap2/omap3-iommu.c
new file mode 100644
index 0000000..4f51c18
--- /dev/null
+++ b/arch/arm/mach-omap2/omap3-iommu.c
@@ -0,0 +1,103 @@
+/*
+ * omap iommu: omap3 device registration
+ *
+ * Copyright (C) 2008-2009 Nokia Corporation
+ *
+ * Written by Hiroshi DOYU <Hiroshi.DOYU@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/platform_device.h>
+#include <asm/io.h>
+#include <mach/iommu.h>
+
+#define OMAP3_MMU1_BASE 0x480bd400
+#define OMAP3_MMU2_BASE 0x5d000000
+#define OMAP3_MMU1_IRQ 24
+#define OMAP3_MMU2_IRQ 28
+
+static struct resource omap3_iommu_res[] = {
+ { /* Camera ISP MMU */
+ .start = OMAP3_MMU1_BASE,
+ .end = OMAP3_MMU1_BASE + MMU_REG_SIZE - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ {
+ .start = OMAP3_MMU1_IRQ,
+ .flags = IORESOURCE_IRQ,
+ },
+ { /* IVA2.2 MMU */
+ .start = OMAP3_MMU2_BASE,
+ .end = OMAP3_MMU2_BASE + MMU_REG_SIZE - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ {
+ .start = OMAP3_MMU2_IRQ,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+#define NR_IOMMU_RES (ARRAY_SIZE(omap3_iommu_res) / 2)
+
+static const struct iommu_platform_data omap3_iommu_pdata[] __initconst = {
+ {
+ .name = "isp",
+ .nr_tlb_entries = 8,
+ .clk_name = "cam_ick",
+ },
+ {
+ .name = "iva2",
+ .nr_tlb_entries = 32,
+ .clk_name = "iva2_ck",
+ },
+};
+#define NR_IOMMU_DEVICES ARRAY_SIZE(omap3_iommu_pdata)
+
+static struct platform_device *omap3_iommu_pdev[NR_IOMMU_DEVICES];
+
+static int __init omap3_iommu_init(void)
+{
+ int i, err;
+
+ for (i = 0; i < NR_IOMMU_DEVICES; i++) {
+ struct platform_device *pdev;
+
+ pdev = platform_device_alloc("omap-iommu", i + 1);
+ if (!pdev)
+ goto err_out;
+ err = platform_device_add_resources(pdev,
+ &omap3_iommu_res[2 * i], NR_IOMMU_RES);
+ if (err)
+ goto err_out;
+ err = platform_device_add_data(pdev, &omap3_iommu_pdata[i],
+ sizeof(omap3_iommu_pdata[0]));
+ if (err)
+ goto err_out;
+ err = platform_device_add(pdev);
+ if (err)
+ goto err_out;
+ omap3_iommu_pdev[i] = pdev;
+ }
+ return 0;
+
+err_out:
+ while (i--)
+ platform_device_put(omap3_iommu_pdev[i]);
+ return err;
+}
+module_init(omap3_iommu_init);
+
+static void __exit omap3_iommu_exit(void)
+{
+ int i;
+
+ for (i = 0; i < NR_IOMMU_DEVICES; i++)
+ platform_device_unregister(omap3_iommu_pdev[i]);
+}
+module_exit(omap3_iommu_exit);
+
+MODULE_AUTHOR("Hiroshi DOYU");
+MODULE_DESCRIPTION("omap iommu: omap3 device registration");
+MODULE_LICENSE("GPL v2");
--
1.6.1.rc4
