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Message-ID: <181733600.20070501080827@gmail.com>
Date: Tue, 1 May 2007 08:08:27 +0300
From: Paul Sokolovsky <pmiscml@...il.com>
To: linux-kernel@...r.kernel.org
Subject: [RFC, PATCH 1/4] SoC base drivers: SoC helper API
Hello linux-kernel,
soc-core: Helper API for SoC base drivers to register/unregister
subdevices.
Signed-off-by: Paul Sokolovsky <pmiscml@...il.com>
arch/arm/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/soc/soc-core.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++++
drivers/soc/soc-core.h | 30 +++++++++++++
include/linux/ioport.h | 3 +
5 files changed, 142 insertions(+), 0 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e7baca2..da7d318 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -997,6 +997,8 @@ source "drivers/mmc/Kconfig"
source "drivers/rtc/Kconfig"
+source "drivers/soc/Kconfig"
+
endmenu
source "fs/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 920c975..3fb8cf1 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -80,3 +80,4 @@ obj-$(CONFIG_GENERIC_TIME) += clocksource/
obj-$(CONFIG_DMA_ENGINE) += dma/
obj-$(CONFIG_HID) += hid/
obj-$(CONFIG_PPC_PS3) += ps3/
+obj-y += soc/
diff --git a/drivers/soc/soc-core.c b/drivers/soc/soc-core.c
new file mode 100644
index 0000000..24c654c
--- /dev/null
+++ b/drivers/soc/soc-core.c
@@ -0,0 +1,106 @@
+/*
+ * drivers/soc/soc-core.c
+ *
+ * core SoC support
+ * Copyright (c) 2006 Ian Molton
+ *
+ * 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.
+ *
+ * This file contains functionality used by many SoC type devices.
+ *
+ * Created: 2006-11-28
+ *
+ */
+
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include "soc-core.h"
+
+void soc_free_devices(struct platform_device *devices, int nr_devs)
+{
+ struct platform_device *dev = devices;
+ int i;
+
+ for (i = 0; i < nr_devs; i++) {
+ struct resource *res = dev->resource;
+ platform_device_unregister(dev++);
+ kfree(res);
+ }
+ kfree(devices);
+}
+EXPORT_SYMBOL_GPL(soc_free_devices);
+
+#define SIGNED_SHIFT(val, shift) ((shift) >= 0 ? ((val) << (shift)) : ((val) >> -(shift)))
+
+struct platform_device *soc_add_devices(struct platform_device *dev,
+ struct soc_device_data *soc, int nr_devs,
+ struct resource *mem,
+ int relative_addr_shift, int irq_base)
+{
+ struct platform_device *devices;
+ int i, r, base;
+
+ devices = kzalloc(nr_devs * sizeof(struct platform_device), GFP_KERNEL);
+ if (!devices)
+ return NULL;
+
+ for (i = 0; i < nr_devs; i++) {
+ struct platform_device *sdev = &devices[i];
+ struct soc_device_data *blk = &soc[i];
+ struct resource *res;
+
+ sdev->id = -1;
+ sdev->name = blk->name;
+
+ sdev->dev.parent = &dev->dev;
+ sdev->dev.platform_data = (void *)blk->hwconfig;
+ sdev->num_resources = blk->num_resources;
+
+ /* Allocate space for the subdevice resources */
+ res = kzalloc (blk->num_resources * sizeof (struct resource), GFP_KERNEL);
+ if (!res)
+ goto fail;
+
+ for (r = 0 ; r < blk->num_resources ; r++) {
+ res[r].name = blk->res[r].name; // Fixme - should copy
+
+ /* Find out base to use */
+ base = 0;
+ if (blk->res[r].flags & IORESOURCE_MEM) {
+ base = mem->start;
+ } else if ((blk->res[r].flags & IORESOURCE_IRQ) &&
+ (blk->res[r].flags & IORESOURCE_IRQ_SOC_SUBDEVICE)) {
+ base = irq_base;
+ }
+
+ /* Adjust resource */
+ if (blk->res[r].flags & IORESOURCE_MEM) {
+ res[r].parent = mem;
+ res[r].start = base + SIGNED_SHIFT(blk->res[r].start, relative_addr_shift);
+ res[r].end = base + SIGNED_SHIFT(blk->res[r].end, relative_addr_shift);
+ } else {
+ res[r].start = base + blk->res[r].start;
+ res[r].end = base + blk->res[r].end;
+ }
+ res[r].flags = blk->res[r].flags;
+ }
+
+ sdev->resource = res;
+ if (platform_device_register(sdev)) {
+ kfree(res);
+ goto fail;
+ }
+
+ printk(KERN_INFO "SoC: registering %s\n", blk->name);
+ }
+ return devices;
+
+fail:
+ soc_free_devices(devices, i + 1);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(soc_add_devices);
diff --git a/drivers/soc/soc-core.h b/drivers/soc/soc-core.h
new file mode 100644
index 0000000..8659f7e
--- /dev/null
+++ b/drivers/soc/soc-core.h
@@ -0,0 +1,30 @@
+/*
+ * drivers/soc/soc-core.h
+ *
+ * core SoC support
+ * Copyright (c) 2006 Ian Molton
+ *
+ * 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.
+ *
+ * This file contains prototypes for the functions in soc-core.c
+ *
+ * Created: 2006-11-28
+ *
+ */
+
+struct soc_device_data {
+ char *name;
+ struct resource *res;
+ int num_resources;
+ void *hwconfig; /* platform_data to pass to the subdevice */
+};
+
+struct platform_device *soc_add_devices(struct platform_device *dev,
+ struct soc_device_data *soc, int n_devs,
+ struct resource *mem,
+ int relative_addr_shift, int irq_base);
+
+void soc_free_devices(struct platform_device *devices, int nr_devs);
+
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 6859a3b..65f0fcd 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -57,6 +57,9 @@ struct resource_list {
#define IORESOURCE_IRQ_LOWLEVEL (1<<3)
#define IORESOURCE_IRQ_SHAREABLE (1<<4)
+/* SoC device IRQ specific bits (IORESOURCE_BITS) */
+#define IORESOURCE_IRQ_SOC_SUBDEVICE (1<<5)
+
/* ISA PnP DMA specific bits (IORESOURCE_BITS) */
#define IORESOURCE_DMA_TYPE_MASK (3<<0)
#define IORESOURCE_DMA_8BIT (0<<0)
--
Best regards,
Paul mailto:pmiscml@...il.com
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