Commit dbdf04c4 authored by Maxim Shchetynin's avatar Maxim Shchetynin Committed by Arnd Bergmann
Browse files

[CELL] driver for DDR2 memory on AXON 



The Axon bridge chip used on new Cell/B.E. based blade servers
comes with a DDR2 memory controller that can be used to
attach cheap memory modules, as opposed to the high-speed
XDR memory that is used by the CPU itself.

Since the memory controller does not participate in the
cache coherency protocol, we can not use the memory direcly
for Linux applications, but by providing a block device
it can be used for swap space, temporary file storage and
through the use of the direct_access block device operation
for mapping into user addresses, when it is mounted with
an appropriate file system.

Signed-off-by: default avatarMaxim Shchetynin <maxim@de.ibm.com>
Signed-off-by: default avatarArnd Bergmann <arnd.bergmann@de.ibm.com>
parent b86ce01c

arch/powerpc/platforms/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -272,4 +272,14 @@ config CPM2 
	  you wish to build a kernel for a machine with a CPM2 coprocessor

	  on it (826x, 827x, 8560).



config AXON_RAM

	tristate "Axon DDR2 memory device driver"

	depends on PPC_IBM_CELL_BLADE

	default m

	help

	  It registers one block device per Axon's DDR2 memory bank found

	  on a system. Block devices are called axonram?, their major and

	  minor numbers are available in /proc/devices, /proc/partitions or

	  in /sys/block/axonram?/dev.



endmenu

arch/powerpc/sysdev/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ obj-$(CONFIG_QUICC_ENGINE) += qe_lib/ 
mv64x60-$(CONFIG_PCI)		+= mv64x60_pci.o

obj-$(CONFIG_MV64X60)		+= $(mv64x60-y) mv64x60_pic.o mv64x60_dev.o

obj-$(CONFIG_RTC_DRV_CMOS)	+= rtc_cmos_setup.o

obj-$(CONFIG_AXON_RAM)		+= axonram.o



# contains only the suspend handler for time

ifeq ($(CONFIG_RTC_CLASS),)

arch/powerpc/sysdev/axonram.c

0 → 100644
+381 −0
Original line number Diff line number Diff line 
/*

 * (C) Copyright IBM Deutschland Entwicklung GmbH 2006

 *

 * Author: Maxim Shchetynin <maxim@de.ibm.com>

 *

 * Axon DDR2 device driver.

 * It registers one block device per Axon's DDR2 memory bank found on a system.

 * Block devices are called axonram?, their major and minor numbers are

 * available in /proc/devices, /proc/partitions or in /sys/block/axonram?/dev.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2, or (at your option)

 * any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */



#include <linux/bio.h>

#include <linux/blkdev.h>

#include <linux/buffer_head.h>

#include <linux/device.h>

#include <linux/errno.h>

#include <linux/fs.h>

#include <linux/genhd.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/ioport.h>

#include <linux/irq.h>

#include <linux/irqreturn.h>

#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/mod_devicetable.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/string.h>

#include <linux/types.h>

#include <asm/of_device.h>

#include <asm/of_platform.h>

#include <asm/page.h>

#include <asm/prom.h>



#define AXON_RAM_MODULE_NAME		"axonram"

#define AXON_RAM_DEVICE_NAME		"axonram"

#define AXON_RAM_MINORS_PER_DISK	16

#define AXON_RAM_BLOCK_SHIFT		PAGE_SHIFT

#define AXON_RAM_BLOCK_SIZE		1 << AXON_RAM_BLOCK_SHIFT

#define AXON_RAM_SECTOR_SHIFT		9

#define AXON_RAM_SECTOR_SIZE		1 << AXON_RAM_SECTOR_SHIFT

#define AXON_RAM_IRQ_FLAGS		IRQF_SHARED | IRQF_TRIGGER_RISING



struct axon_ram_bank {

	struct of_device	*device;

	struct gendisk		*disk;

	unsigned int		irq_correctable;

	unsigned int		irq_uncorrectable;

	unsigned long		ph_addr;

	unsigned long		io_addr;

	unsigned long		size;

	unsigned long		ecc_counter;

};



static ssize_t

axon_ram_sysfs_ecc(struct device *dev, struct device_attribute *attr, char *buf)

{

	struct of_device *device = to_of_device(dev);

	struct axon_ram_bank *bank = device->dev.platform_data;



	BUG_ON(!bank);



	return sprintf(buf, "%ld\n", bank->ecc_counter);

}



static DEVICE_ATTR(ecc, S_IRUGO, axon_ram_sysfs_ecc, NULL);



/**

 * axon_ram_irq_handler - interrupt handler for Axon RAM ECC

 * @irq: interrupt ID

 * @dev: pointer to of_device

 */

static irqreturn_t

axon_ram_irq_handler(int irq, void *dev)

{

	struct of_device *device = dev;

	struct axon_ram_bank *bank = device->dev.platform_data;



	BUG_ON(!bank);



	if (irq == bank->irq_correctable) {

		dev_err(&device->dev, "Correctable memory error occured\n");

		bank->ecc_counter++;

		return IRQ_HANDLED;

	} else if (irq == bank->irq_uncorrectable) {

		dev_err(&device->dev, "Uncorrectable memory error occured\n");

		panic("Critical ECC error on %s", device->node->full_name);

	}



	return IRQ_NONE;

}



/**

 * axon_ram_make_request - make_request() method for block device

 * @queue, @bio: see blk_queue_make_request()

 */

static int

axon_ram_make_request(struct request_queue *queue, struct bio *bio)

{

	struct axon_ram_bank *bank = bio->bi_bdev->bd_disk->private_data;

	unsigned long phys_mem, phys_end;

	void *user_mem;

	struct bio_vec *vec;

	unsigned int transfered;

	unsigned short idx;

	int rc = 0;



	phys_mem = bank->io_addr + (bio->bi_sector << AXON_RAM_SECTOR_SHIFT);

	phys_end = bank->io_addr + bank->size;

	transfered = 0;

	bio_for_each_segment(vec, bio, idx) {

		if (unlikely(phys_mem + vec->bv_len > phys_end)) {

			bio_io_error(bio, bio->bi_size);

			rc = -ERANGE;

			break;

		}



		user_mem = page_address(vec->bv_page) + vec->bv_offset;

		if (bio_data_dir(bio) == READ)

			memcpy(user_mem, (void *) phys_mem, vec->bv_len);

		else

			memcpy((void *) phys_mem, user_mem, vec->bv_len);



		phys_mem += vec->bv_len;

		transfered += vec->bv_len;

	}

	bio_endio(bio, transfered, 0);



	return rc;

}



/**

 * axon_ram_direct_access - direct_access() method for block device

 * @device, @sector, @data: see block_device_operations method

 */

static int

axon_ram_direct_access(struct block_device *device, sector_t sector,

		       unsigned long *data)

{

	struct axon_ram_bank *bank = device->bd_disk->private_data;

	loff_t offset;



	offset = sector << AXON_RAM_SECTOR_SHIFT;

	if (offset >= bank->size) {

		dev_err(&bank->device->dev, "Access outside of address space\n");

		return -ERANGE;

	}



	*data = bank->ph_addr + offset;



	return 0;

}



static struct block_device_operations axon_ram_devops = {

	.owner		= THIS_MODULE,

	.direct_access	= axon_ram_direct_access

};



/**

 * axon_ram_probe - probe() method for platform driver

 * @device, @device_id: see of_platform_driver method

 */

static int

axon_ram_probe(struct of_device *device, const struct of_device_id *device_id)

{

	static int axon_ram_bank_id = -1;

	struct axon_ram_bank *bank;

	struct resource resource;

	int rc = 0;



	axon_ram_bank_id++;



	dev_info(&device->dev, "Found memory controller on %s\n",

			device->node->full_name);



	bank = kzalloc(sizeof(struct axon_ram_bank), GFP_KERNEL);

	if (bank == NULL) {

		dev_err(&device->dev, "Out of memory\n");

		rc = -ENOMEM;

		goto failed;

	}



	device->dev.platform_data = bank;



	bank->device = device;



	if (of_address_to_resource(device->node, 0, &resource) != 0) {

		dev_err(&device->dev, "Cannot access device tree\n");

		rc = -EFAULT;

		goto failed;

	}



	bank->size = resource.end - resource.start + 1;



	if (bank->size == 0) {

		dev_err(&device->dev, "No DDR2 memory found for %s%d\n",

				AXON_RAM_DEVICE_NAME, axon_ram_bank_id);

		rc = -ENODEV;

		goto failed;

	}



	dev_info(&device->dev, "Register DDR2 memory device %s%d with %luMB\n",

			AXON_RAM_DEVICE_NAME, axon_ram_bank_id, bank->size >> 20);



	bank->ph_addr = resource.start;

	bank->io_addr = (unsigned long) ioremap_flags(

			bank->ph_addr, bank->size, _PAGE_NO_CACHE);

	if (bank->io_addr == 0) {

		dev_err(&device->dev, "ioremap() failed\n");

		rc = -EFAULT;

		goto failed;

	}



	bank->disk = alloc_disk(AXON_RAM_MINORS_PER_DISK);

	if (bank->disk == NULL) {

		dev_err(&device->dev, "Cannot register disk\n");

		rc = -EFAULT;

		goto failed;

	}



	bank->disk->first_minor = 0;

	bank->disk->fops = &axon_ram_devops;

	bank->disk->private_data = bank;

	bank->disk->driverfs_dev = &device->dev;



	sprintf(bank->disk->disk_name, "%s%d",

			AXON_RAM_DEVICE_NAME, axon_ram_bank_id);

	bank->disk->major = register_blkdev(0, bank->disk->disk_name);

	if (bank->disk->major < 0) {

		dev_err(&device->dev, "Cannot register block device\n");

		rc = -EFAULT;

		goto failed;

	}



	bank->disk->queue = blk_alloc_queue(GFP_KERNEL);

	if (bank->disk->queue == NULL) {

		dev_err(&device->dev, "Cannot register disk queue\n");

		rc = -EFAULT;

		goto failed;

	}



	set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT);

	blk_queue_make_request(bank->disk->queue, axon_ram_make_request);

	blk_queue_hardsect_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE);

	add_disk(bank->disk);



	bank->irq_correctable = irq_of_parse_and_map(device->node, 0);

	bank->irq_uncorrectable = irq_of_parse_and_map(device->node, 1);

	if ((bank->irq_correctable <= 0) || (bank->irq_uncorrectable <= 0)) {

		dev_err(&device->dev, "Cannot access ECC interrupt ID\n");

		rc = -EFAULT;

		goto failed;

	}



	rc = request_irq(bank->irq_correctable, axon_ram_irq_handler,

			AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device);

	if (rc != 0) {

		dev_err(&device->dev, "Cannot register ECC interrupt handler\n");

		bank->irq_correctable = bank->irq_uncorrectable = 0;

		rc = -EFAULT;

		goto failed;

	}



	rc = request_irq(bank->irq_uncorrectable, axon_ram_irq_handler,

			AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device);

	if (rc != 0) {

		dev_err(&device->dev, "Cannot register ECC interrupt handler\n");

		bank->irq_uncorrectable = 0;

		rc = -EFAULT;

		goto failed;

	}



	rc = device_create_file(&device->dev, &dev_attr_ecc);

	if (rc != 0) {

		dev_err(&device->dev, "Cannot create sysfs file\n");

		rc = -EFAULT;

		goto failed;

	}



	return 0;



failed:

	if (bank != NULL) {

		if (bank->irq_uncorrectable > 0)

			free_irq(bank->irq_uncorrectable, device);

		if (bank->irq_correctable > 0)

			free_irq(bank->irq_correctable, device);

		if (bank->disk != NULL) {

			if (bank->disk->queue != NULL)

				blk_cleanup_queue(bank->disk->queue);

			if (bank->disk->major > 0)

				unregister_blkdev(bank->disk->major,

						bank->disk->disk_name);

			del_gendisk(bank->disk);

		}

		device->dev.platform_data = NULL;

		if (bank->io_addr != 0)

			iounmap((void __iomem *) bank->io_addr);

		kfree(bank);

	}



	return rc;

}



/**

 * axon_ram_remove - remove() method for platform driver

 * @device: see of_platform_driver method

 */

static int

axon_ram_remove(struct of_device *device)

{

	struct axon_ram_bank *bank = device->dev.platform_data;



	BUG_ON(!bank || !bank->disk);



	device_remove_file(&device->dev, &dev_attr_ecc);

	free_irq(bank->irq_uncorrectable, device);

	free_irq(bank->irq_correctable, device);

	blk_cleanup_queue(bank->disk->queue);

	unregister_blkdev(bank->disk->major, bank->disk->disk_name);

	del_gendisk(bank->disk);

	iounmap((void __iomem *) bank->io_addr);

	kfree(bank);



	return 0;

}



static struct of_device_id axon_ram_device_id[] = {

	{

		.type	= "dma-memory"

	},

	{}

};



static struct of_platform_driver axon_ram_driver = {

	.owner		= THIS_MODULE,

	.name		= AXON_RAM_MODULE_NAME,

	.match_table	= axon_ram_device_id,

	.probe		= axon_ram_probe,

	.remove		= axon_ram_remove

};



/**

 * axon_ram_init

 */

static int __init

axon_ram_init(void)

{

	return of_register_platform_driver(&axon_ram_driver);

}



/**

 * axon_ram_exit

 */

static void __exit

axon_ram_exit(void)

{

	of_unregister_platform_driver(&axon_ram_driver);

}



module_init(axon_ram_init);

module_exit(axon_ram_exit);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Maxim Shchetynin <maxim@de.ibm.com>");

MODULE_DESCRIPTION("Axon DDR2 RAM device driver for IBM Cell BE");

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