diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/sysdev/axonram.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/powerpc/sysdev/axonram.c | 365 |
1 files changed, 0 insertions, 365 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/sysdev/axonram.c b/ANDROID_3.4.5/arch/powerpc/sysdev/axonram.c deleted file mode 100644 index 1c16141c..00000000 --- a/ANDROID_3.4.5/arch/powerpc/sysdev/axonram.c +++ /dev/null @@ -1,365 +0,0 @@ -/* - * (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/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 <linux/of_device.h> -#include <linux/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 - -static int azfs_major, azfs_minor; - -struct axon_ram_bank { - struct platform_device *device; - struct gendisk *disk; - unsigned int irq_id; - 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 platform_device *device = to_platform_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 platform_device *device = dev; - struct axon_ram_bank *bank = device->dev.platform_data; - - BUG_ON(!bank); - - dev_err(&device->dev, "Correctable memory error occurred\n"); - bank->ecc_counter++; - return IRQ_HANDLED; -} - -/** - * axon_ram_make_request - make_request() method for block device - * @queue, @bio: see blk_queue_make_request() - */ -static void -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; - - 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); - return; - } - - 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, 0); -} - -/** - * 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, - void **kaddr, unsigned long *pfn) -{ - struct axon_ram_bank *bank = device->bd_disk->private_data; - loff_t offset; - - offset = sector; - if (device->bd_part != NULL) - offset += device->bd_part->start_sect; - offset <<= AXON_RAM_SECTOR_SHIFT; - if (offset >= bank->size) { - dev_err(&bank->device->dev, "Access outside of address space\n"); - return -ERANGE; - } - - *kaddr = (void *)(bank->ph_addr + offset); - *pfn = virt_to_phys(kaddr) >> PAGE_SHIFT; - - return 0; -} - -static const 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: see platform_driver method - */ -static int axon_ram_probe(struct platform_device *device) -{ - 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->dev.of_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->dev.of_node, 0, &resource) != 0) { - dev_err(&device->dev, "Cannot access device tree\n"); - rc = -EFAULT; - goto failed; - } - - bank->size = resource_size(&resource); - - 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_prot( - 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->major = azfs_major; - bank->disk->first_minor = azfs_minor; - 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->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_logical_block_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE); - add_disk(bank->disk); - - bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0); - if (bank->irq_id == NO_IRQ) { - dev_err(&device->dev, "Cannot access ECC interrupt ID\n"); - rc = -EFAULT; - goto failed; - } - - rc = request_irq(bank->irq_id, 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_id = NO_IRQ; - 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; - } - - azfs_minor += bank->disk->minors; - - return 0; - -failed: - if (bank != NULL) { - if (bank->irq_id != NO_IRQ) - free_irq(bank->irq_id, device); - if (bank->disk != NULL) { - 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 platform_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_id, device); - 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 platform_driver axon_ram_driver = { - .probe = axon_ram_probe, - .remove = axon_ram_remove, - .driver = { - .name = AXON_RAM_MODULE_NAME, - .owner = THIS_MODULE, - .of_match_table = axon_ram_device_id, - }, -}; - -/** - * axon_ram_init - */ -static int __init -axon_ram_init(void) -{ - azfs_major = register_blkdev(azfs_major, AXON_RAM_DEVICE_NAME); - if (azfs_major < 0) { - printk(KERN_ERR "%s cannot become block device major number\n", - AXON_RAM_MODULE_NAME); - return -EFAULT; - } - azfs_minor = 0; - - return platform_driver_register(&axon_ram_driver); -} - -/** - * axon_ram_exit - */ -static void __exit -axon_ram_exit(void) -{ - platform_driver_unregister(&axon_ram_driver); - unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME); -} - -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"); |