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1130 lines
30 KiB
1130 lines
30 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* mm.c - Micro Memory(tm) PCI memory board block device driver - v2.3 |
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* |
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* (C) 2001 San Mehat <[email protected]> |
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* (C) 2001 Johannes Erdfelt <[email protected]> |
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* (C) 2001 NeilBrown <[email protected]> |
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* |
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* This driver for the Micro Memory PCI Memory Module with Battery Backup |
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* is Copyright Micro Memory Inc 2001-2002. All rights reserved. |
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* |
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* This driver provides a standard block device interface for Micro Memory(tm) |
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* PCI based RAM boards. |
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* 10/05/01: Phap Nguyen - Rebuilt the driver |
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* 10/22/01: Phap Nguyen - v2.1 Added disk partitioning |
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* 29oct2001:NeilBrown - Use make_request_fn instead of request_fn |
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* - use stand disk partitioning (so fdisk works). |
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* 08nov2001:NeilBrown - change driver name from "mm" to "umem" |
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* - incorporate into main kernel |
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* 08apr2002:NeilBrown - Move some of interrupt handle to tasklet |
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* - use spin_lock_bh instead of _irq |
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* - Never block on make_request. queue |
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* bh's instead. |
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* - unregister umem from devfs at mod unload |
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* - Change version to 2.3 |
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* 07Nov2001:Phap Nguyen - Select pci read command: 06, 12, 15 (Decimal) |
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* 07Jan2002: P. Nguyen - Used PCI Memory Write & Invalidate for DMA |
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* 15May2002:NeilBrown - convert to bio for 2.5 |
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* 17May2002:NeilBrown - remove init_mem initialisation. Instead detect |
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* - a sequence of writes that cover the card, and |
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* - set initialised bit then. |
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*/ |
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#undef DEBUG /* #define DEBUG if you want debugging info (pr_debug) */ |
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#include <linux/fs.h> |
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#include <linux/bio.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/mman.h> |
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#include <linux/gfp.h> |
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#include <linux/ioctl.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/timer.h> |
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#include <linux/pci.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/fcntl.h> /* O_ACCMODE */ |
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#include <linux/hdreg.h> /* HDIO_GETGEO */ |
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#include "umem.h" |
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#include <linux/uaccess.h> |
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#include <asm/io.h> |
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#define MM_MAXCARDS 4 |
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#define MM_RAHEAD 2 /* two sectors */ |
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#define MM_BLKSIZE 1024 /* 1k blocks */ |
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#define MM_HARDSECT 512 /* 512-byte hardware sectors */ |
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#define MM_SHIFT 6 /* max 64 partitions on 4 cards */ |
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/* |
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* Version Information |
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*/ |
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#define DRIVER_NAME "umem" |
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#define DRIVER_VERSION "v2.3" |
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#define DRIVER_AUTHOR "San Mehat, Johannes Erdfelt, NeilBrown" |
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#define DRIVER_DESC "Micro Memory(tm) PCI memory board block driver" |
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static int debug; |
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/* #define HW_TRACE(x) writeb(x,cards[0].csr_remap + MEMCTRLSTATUS_MAGIC) */ |
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#define HW_TRACE(x) |
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#define DEBUG_LED_ON_TRANSFER 0x01 |
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#define DEBUG_BATTERY_POLLING 0x02 |
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module_param(debug, int, 0644); |
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MODULE_PARM_DESC(debug, "Debug bitmask"); |
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static int pci_read_cmd = 0x0C; /* Read Multiple */ |
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module_param(pci_read_cmd, int, 0); |
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MODULE_PARM_DESC(pci_read_cmd, "PCI read command"); |
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static int pci_write_cmd = 0x0F; /* Write and Invalidate */ |
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module_param(pci_write_cmd, int, 0); |
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MODULE_PARM_DESC(pci_write_cmd, "PCI write command"); |
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static int pci_cmds; |
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static int major_nr; |
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#include <linux/blkdev.h> |
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#include <linux/blkpg.h> |
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struct cardinfo { |
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struct pci_dev *dev; |
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unsigned char __iomem *csr_remap; |
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unsigned int mm_size; /* size in kbytes */ |
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unsigned int init_size; /* initial segment, in sectors, |
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* that we know to |
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* have been written |
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*/ |
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struct bio *bio, *currentbio, **biotail; |
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struct bvec_iter current_iter; |
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struct request_queue *queue; |
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struct mm_page { |
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dma_addr_t page_dma; |
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struct mm_dma_desc *desc; |
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int cnt, headcnt; |
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struct bio *bio, **biotail; |
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struct bvec_iter iter; |
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} mm_pages[2]; |
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#define DESC_PER_PAGE ((PAGE_SIZE*2)/sizeof(struct mm_dma_desc)) |
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int Active, Ready; |
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struct tasklet_struct tasklet; |
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unsigned int dma_status; |
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struct { |
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int good; |
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int warned; |
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unsigned long last_change; |
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} battery[2]; |
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spinlock_t lock; |
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int check_batteries; |
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int flags; |
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}; |
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static struct cardinfo cards[MM_MAXCARDS]; |
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static struct timer_list battery_timer; |
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static int num_cards; |
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static struct gendisk *mm_gendisk[MM_MAXCARDS]; |
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static void check_batteries(struct cardinfo *card); |
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static int get_userbit(struct cardinfo *card, int bit) |
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{ |
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unsigned char led; |
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led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL); |
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return led & bit; |
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} |
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static int set_userbit(struct cardinfo *card, int bit, unsigned char state) |
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{ |
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unsigned char led; |
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led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL); |
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if (state) |
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led |= bit; |
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else |
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led &= ~bit; |
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writeb(led, card->csr_remap + MEMCTRLCMD_LEDCTRL); |
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return 0; |
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} |
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/* |
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* NOTE: For the power LED, use the LED_POWER_* macros since they differ |
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*/ |
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static void set_led(struct cardinfo *card, int shift, unsigned char state) |
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{ |
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unsigned char led; |
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led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL); |
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if (state == LED_FLIP) |
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led ^= (1<<shift); |
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else { |
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led &= ~(0x03 << shift); |
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led |= (state << shift); |
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} |
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writeb(led, card->csr_remap + MEMCTRLCMD_LEDCTRL); |
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} |
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#ifdef MM_DIAG |
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static void dump_regs(struct cardinfo *card) |
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{ |
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unsigned char *p; |
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int i, i1; |
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p = card->csr_remap; |
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for (i = 0; i < 8; i++) { |
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printk(KERN_DEBUG "%p ", p); |
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for (i1 = 0; i1 < 16; i1++) |
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printk("%02x ", *p++); |
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printk("\n"); |
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} |
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} |
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#endif |
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static void dump_dmastat(struct cardinfo *card, unsigned int dmastat) |
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{ |
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dev_printk(KERN_DEBUG, &card->dev->dev, "DMAstat - "); |
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if (dmastat & DMASCR_ANY_ERR) |
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printk(KERN_CONT "ANY_ERR "); |
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if (dmastat & DMASCR_MBE_ERR) |
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printk(KERN_CONT "MBE_ERR "); |
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if (dmastat & DMASCR_PARITY_ERR_REP) |
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printk(KERN_CONT "PARITY_ERR_REP "); |
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if (dmastat & DMASCR_PARITY_ERR_DET) |
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printk(KERN_CONT "PARITY_ERR_DET "); |
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if (dmastat & DMASCR_SYSTEM_ERR_SIG) |
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printk(KERN_CONT "SYSTEM_ERR_SIG "); |
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if (dmastat & DMASCR_TARGET_ABT) |
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printk(KERN_CONT "TARGET_ABT "); |
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if (dmastat & DMASCR_MASTER_ABT) |
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printk(KERN_CONT "MASTER_ABT "); |
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if (dmastat & DMASCR_CHAIN_COMPLETE) |
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printk(KERN_CONT "CHAIN_COMPLETE "); |
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if (dmastat & DMASCR_DMA_COMPLETE) |
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printk(KERN_CONT "DMA_COMPLETE "); |
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printk("\n"); |
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} |
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/* |
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* Theory of request handling |
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* |
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* Each bio is assigned to one mm_dma_desc - which may not be enough FIXME |
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* We have two pages of mm_dma_desc, holding about 64 descriptors |
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* each. These are allocated at init time. |
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* One page is "Ready" and is either full, or can have request added. |
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* The other page might be "Active", which DMA is happening on it. |
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* |
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* Whenever IO on the active page completes, the Ready page is activated |
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* and the ex-Active page is clean out and made Ready. |
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* Otherwise the Ready page is only activated when it becomes full. |
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* |
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* If a request arrives while both pages a full, it is queued, and b_rdev is |
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* overloaded to record whether it was a read or a write. |
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* |
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* The interrupt handler only polls the device to clear the interrupt. |
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* The processing of the result is done in a tasklet. |
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*/ |
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static void mm_start_io(struct cardinfo *card) |
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{ |
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/* we have the lock, we know there is |
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* no IO active, and we know that card->Active |
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* is set |
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*/ |
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struct mm_dma_desc *desc; |
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struct mm_page *page; |
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int offset; |
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/* make the last descriptor end the chain */ |
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page = &card->mm_pages[card->Active]; |
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pr_debug("start_io: %d %d->%d\n", |
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card->Active, page->headcnt, page->cnt - 1); |
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desc = &page->desc[page->cnt-1]; |
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desc->control_bits |= cpu_to_le32(DMASCR_CHAIN_COMP_EN); |
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desc->control_bits &= ~cpu_to_le32(DMASCR_CHAIN_EN); |
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desc->sem_control_bits = desc->control_bits; |
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if (debug & DEBUG_LED_ON_TRANSFER) |
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set_led(card, LED_REMOVE, LED_ON); |
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desc = &page->desc[page->headcnt]; |
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writel(0, card->csr_remap + DMA_PCI_ADDR); |
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writel(0, card->csr_remap + DMA_PCI_ADDR + 4); |
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writel(0, card->csr_remap + DMA_LOCAL_ADDR); |
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writel(0, card->csr_remap + DMA_LOCAL_ADDR + 4); |
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writel(0, card->csr_remap + DMA_TRANSFER_SIZE); |
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writel(0, card->csr_remap + DMA_TRANSFER_SIZE + 4); |
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writel(0, card->csr_remap + DMA_SEMAPHORE_ADDR); |
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writel(0, card->csr_remap + DMA_SEMAPHORE_ADDR + 4); |
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offset = ((char *)desc) - ((char *)page->desc); |
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writel(cpu_to_le32((page->page_dma+offset) & 0xffffffff), |
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card->csr_remap + DMA_DESCRIPTOR_ADDR); |
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/* Force the value to u64 before shifting otherwise >> 32 is undefined C |
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* and on some ports will do nothing ! */ |
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writel(cpu_to_le32(((u64)page->page_dma)>>32), |
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card->csr_remap + DMA_DESCRIPTOR_ADDR + 4); |
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/* Go, go, go */ |
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writel(cpu_to_le32(DMASCR_GO | DMASCR_CHAIN_EN | pci_cmds), |
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card->csr_remap + DMA_STATUS_CTRL); |
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} |
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static int add_bio(struct cardinfo *card); |
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static void activate(struct cardinfo *card) |
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{ |
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/* if No page is Active, and Ready is |
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* not empty, then switch Ready page |
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* to active and start IO. |
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* Then add any bh's that are available to Ready |
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*/ |
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do { |
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while (add_bio(card)) |
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; |
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if (card->Active == -1 && |
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card->mm_pages[card->Ready].cnt > 0) { |
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card->Active = card->Ready; |
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card->Ready = 1-card->Ready; |
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mm_start_io(card); |
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} |
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} while (card->Active == -1 && add_bio(card)); |
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} |
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static inline void reset_page(struct mm_page *page) |
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{ |
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page->cnt = 0; |
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page->headcnt = 0; |
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page->bio = NULL; |
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page->biotail = &page->bio; |
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} |
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/* |
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* If there is room on Ready page, take |
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* one bh off list and add it. |
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* return 1 if there was room, else 0. |
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*/ |
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static int add_bio(struct cardinfo *card) |
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{ |
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struct mm_page *p; |
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struct mm_dma_desc *desc; |
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dma_addr_t dma_handle; |
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int offset; |
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struct bio *bio; |
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struct bio_vec vec; |
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bio = card->currentbio; |
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if (!bio && card->bio) { |
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card->currentbio = card->bio; |
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card->current_iter = card->bio->bi_iter; |
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card->bio = card->bio->bi_next; |
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if (card->bio == NULL) |
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card->biotail = &card->bio; |
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card->currentbio->bi_next = NULL; |
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return 1; |
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} |
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if (!bio) |
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return 0; |
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if (card->mm_pages[card->Ready].cnt >= DESC_PER_PAGE) |
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return 0; |
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vec = bio_iter_iovec(bio, card->current_iter); |
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dma_handle = dma_map_page(&card->dev->dev, |
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vec.bv_page, |
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vec.bv_offset, |
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vec.bv_len, |
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bio_op(bio) == REQ_OP_READ ? |
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DMA_FROM_DEVICE : DMA_TO_DEVICE); |
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p = &card->mm_pages[card->Ready]; |
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desc = &p->desc[p->cnt]; |
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p->cnt++; |
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if (p->bio == NULL) |
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p->iter = card->current_iter; |
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if ((p->biotail) != &bio->bi_next) { |
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*(p->biotail) = bio; |
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p->biotail = &(bio->bi_next); |
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bio->bi_next = NULL; |
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} |
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desc->data_dma_handle = dma_handle; |
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desc->pci_addr = cpu_to_le64((u64)desc->data_dma_handle); |
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desc->local_addr = cpu_to_le64(card->current_iter.bi_sector << 9); |
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desc->transfer_size = cpu_to_le32(vec.bv_len); |
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offset = (((char *)&desc->sem_control_bits) - ((char *)p->desc)); |
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desc->sem_addr = cpu_to_le64((u64)(p->page_dma+offset)); |
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desc->zero1 = desc->zero2 = 0; |
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offset = (((char *)(desc+1)) - ((char *)p->desc)); |
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desc->next_desc_addr = cpu_to_le64(p->page_dma+offset); |
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desc->control_bits = cpu_to_le32(DMASCR_GO|DMASCR_ERR_INT_EN| |
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DMASCR_PARITY_INT_EN| |
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DMASCR_CHAIN_EN | |
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DMASCR_SEM_EN | |
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pci_cmds); |
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if (bio_op(bio) == REQ_OP_WRITE) |
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desc->control_bits |= cpu_to_le32(DMASCR_TRANSFER_READ); |
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desc->sem_control_bits = desc->control_bits; |
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bio_advance_iter(bio, &card->current_iter, vec.bv_len); |
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if (!card->current_iter.bi_size) |
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card->currentbio = NULL; |
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return 1; |
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} |
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static void process_page(unsigned long data) |
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{ |
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/* check if any of the requests in the page are DMA_COMPLETE, |
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* and deal with them appropriately. |
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* If we find a descriptor without DMA_COMPLETE in the semaphore, then |
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* dma must have hit an error on that descriptor, so use dma_status |
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* instead and assume that all following descriptors must be re-tried. |
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*/ |
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struct mm_page *page; |
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struct bio *return_bio = NULL; |
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struct cardinfo *card = (struct cardinfo *)data; |
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unsigned int dma_status = card->dma_status; |
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spin_lock(&card->lock); |
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if (card->Active < 0) |
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goto out_unlock; |
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page = &card->mm_pages[card->Active]; |
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while (page->headcnt < page->cnt) { |
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struct bio *bio = page->bio; |
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struct mm_dma_desc *desc = &page->desc[page->headcnt]; |
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int control = le32_to_cpu(desc->sem_control_bits); |
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int last = 0; |
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struct bio_vec vec; |
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if (!(control & DMASCR_DMA_COMPLETE)) { |
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control = dma_status; |
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last = 1; |
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} |
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page->headcnt++; |
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vec = bio_iter_iovec(bio, page->iter); |
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bio_advance_iter(bio, &page->iter, vec.bv_len); |
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if (!page->iter.bi_size) { |
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page->bio = bio->bi_next; |
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if (page->bio) |
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page->iter = page->bio->bi_iter; |
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} |
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dma_unmap_page(&card->dev->dev, desc->data_dma_handle, |
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vec.bv_len, |
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(control & DMASCR_TRANSFER_READ) ? |
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DMA_TO_DEVICE : DMA_FROM_DEVICE); |
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if (control & DMASCR_HARD_ERROR) { |
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/* error */ |
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bio->bi_status = BLK_STS_IOERR; |
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dev_printk(KERN_WARNING, &card->dev->dev, |
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"I/O error on sector %d/%d\n", |
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le32_to_cpu(desc->local_addr)>>9, |
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le32_to_cpu(desc->transfer_size)); |
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dump_dmastat(card, control); |
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} else if (op_is_write(bio_op(bio)) && |
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le32_to_cpu(desc->local_addr) >> 9 == |
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card->init_size) { |
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card->init_size += le32_to_cpu(desc->transfer_size) >> 9; |
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if (card->init_size >> 1 >= card->mm_size) { |
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dev_printk(KERN_INFO, &card->dev->dev, |
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"memory now initialised\n"); |
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set_userbit(card, MEMORY_INITIALIZED, 1); |
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} |
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} |
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if (bio != page->bio) { |
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bio->bi_next = return_bio; |
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return_bio = bio; |
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} |
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if (last) |
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break; |
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} |
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if (debug & DEBUG_LED_ON_TRANSFER) |
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set_led(card, LED_REMOVE, LED_OFF); |
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|
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if (card->check_batteries) { |
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card->check_batteries = 0; |
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check_batteries(card); |
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} |
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if (page->headcnt >= page->cnt) { |
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reset_page(page); |
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card->Active = -1; |
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activate(card); |
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} else { |
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/* haven't finished with this one yet */ |
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pr_debug("do some more\n"); |
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mm_start_io(card); |
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} |
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out_unlock: |
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spin_unlock(&card->lock); |
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while (return_bio) { |
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struct bio *bio = return_bio; |
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return_bio = bio->bi_next; |
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bio->bi_next = NULL; |
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bio_endio(bio); |
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} |
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} |
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static void mm_unplug(struct blk_plug_cb *cb, bool from_schedule) |
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{ |
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struct cardinfo *card = cb->data; |
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|
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spin_lock_irq(&card->lock); |
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activate(card); |
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spin_unlock_irq(&card->lock); |
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kfree(cb); |
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} |
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static int mm_check_plugged(struct cardinfo *card) |
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{ |
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return !!blk_check_plugged(mm_unplug, card, sizeof(struct blk_plug_cb)); |
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} |
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static blk_qc_t mm_submit_bio(struct bio *bio) |
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{ |
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struct cardinfo *card = bio->bi_bdev->bd_disk->private_data; |
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pr_debug("mm_make_request %llu %u\n", |
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(unsigned long long)bio->bi_iter.bi_sector, |
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bio->bi_iter.bi_size); |
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blk_queue_split(&bio); |
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spin_lock_irq(&card->lock); |
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*card->biotail = bio; |
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bio->bi_next = NULL; |
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card->biotail = &bio->bi_next; |
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if (op_is_sync(bio->bi_opf) || !mm_check_plugged(card)) |
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activate(card); |
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spin_unlock_irq(&card->lock); |
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return BLK_QC_T_NONE; |
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} |
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static irqreturn_t mm_interrupt(int irq, void *__card) |
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{ |
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struct cardinfo *card = (struct cardinfo *) __card; |
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unsigned int dma_status; |
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unsigned short cfg_status; |
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|
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HW_TRACE(0x30); |
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dma_status = le32_to_cpu(readl(card->csr_remap + DMA_STATUS_CTRL)); |
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|
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if (!(dma_status & (DMASCR_ERROR_MASK | DMASCR_CHAIN_COMPLETE))) { |
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/* interrupt wasn't for me ... */ |
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return IRQ_NONE; |
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} |
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|
|
/* clear COMPLETION interrupts */ |
|
if (card->flags & UM_FLAG_NO_BYTE_STATUS) |
|
writel(cpu_to_le32(DMASCR_DMA_COMPLETE|DMASCR_CHAIN_COMPLETE), |
|
card->csr_remap + DMA_STATUS_CTRL); |
|
else |
|
writeb((DMASCR_DMA_COMPLETE|DMASCR_CHAIN_COMPLETE) >> 16, |
|
card->csr_remap + DMA_STATUS_CTRL + 2); |
|
|
|
/* log errors and clear interrupt status */ |
|
if (dma_status & DMASCR_ANY_ERR) { |
|
unsigned int data_log1, data_log2; |
|
unsigned int addr_log1, addr_log2; |
|
unsigned char stat, count, syndrome, check; |
|
|
|
stat = readb(card->csr_remap + MEMCTRLCMD_ERRSTATUS); |
|
|
|
data_log1 = le32_to_cpu(readl(card->csr_remap + |
|
ERROR_DATA_LOG)); |
|
data_log2 = le32_to_cpu(readl(card->csr_remap + |
|
ERROR_DATA_LOG + 4)); |
|
addr_log1 = le32_to_cpu(readl(card->csr_remap + |
|
ERROR_ADDR_LOG)); |
|
addr_log2 = readb(card->csr_remap + ERROR_ADDR_LOG + 4); |
|
|
|
count = readb(card->csr_remap + ERROR_COUNT); |
|
syndrome = readb(card->csr_remap + ERROR_SYNDROME); |
|
check = readb(card->csr_remap + ERROR_CHECK); |
|
|
|
dump_dmastat(card, dma_status); |
|
|
|
if (stat & 0x01) |
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"Memory access error detected (err count %d)\n", |
|
count); |
|
if (stat & 0x02) |
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"Multi-bit EDC error\n"); |
|
|
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"Fault Address 0x%02x%08x, Fault Data 0x%08x%08x\n", |
|
addr_log2, addr_log1, data_log2, data_log1); |
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"Fault Check 0x%02x, Fault Syndrome 0x%02x\n", |
|
check, syndrome); |
|
|
|
writeb(0, card->csr_remap + ERROR_COUNT); |
|
} |
|
|
|
if (dma_status & DMASCR_PARITY_ERR_REP) { |
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"PARITY ERROR REPORTED\n"); |
|
pci_read_config_word(card->dev, PCI_STATUS, &cfg_status); |
|
pci_write_config_word(card->dev, PCI_STATUS, cfg_status); |
|
} |
|
|
|
if (dma_status & DMASCR_PARITY_ERR_DET) { |
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"PARITY ERROR DETECTED\n"); |
|
pci_read_config_word(card->dev, PCI_STATUS, &cfg_status); |
|
pci_write_config_word(card->dev, PCI_STATUS, cfg_status); |
|
} |
|
|
|
if (dma_status & DMASCR_SYSTEM_ERR_SIG) { |
|
dev_printk(KERN_ERR, &card->dev->dev, "SYSTEM ERROR\n"); |
|
pci_read_config_word(card->dev, PCI_STATUS, &cfg_status); |
|
pci_write_config_word(card->dev, PCI_STATUS, cfg_status); |
|
} |
|
|
|
if (dma_status & DMASCR_TARGET_ABT) { |
|
dev_printk(KERN_ERR, &card->dev->dev, "TARGET ABORT\n"); |
|
pci_read_config_word(card->dev, PCI_STATUS, &cfg_status); |
|
pci_write_config_word(card->dev, PCI_STATUS, cfg_status); |
|
} |
|
|
|
if (dma_status & DMASCR_MASTER_ABT) { |
|
dev_printk(KERN_ERR, &card->dev->dev, "MASTER ABORT\n"); |
|
pci_read_config_word(card->dev, PCI_STATUS, &cfg_status); |
|
pci_write_config_word(card->dev, PCI_STATUS, cfg_status); |
|
} |
|
|
|
/* and process the DMA descriptors */ |
|
card->dma_status = dma_status; |
|
tasklet_schedule(&card->tasklet); |
|
|
|
HW_TRACE(0x36); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/* |
|
* If both batteries are good, no LED |
|
* If either battery has been warned, solid LED |
|
* If both batteries are bad, flash the LED quickly |
|
* If either battery is bad, flash the LED semi quickly |
|
*/ |
|
static void set_fault_to_battery_status(struct cardinfo *card) |
|
{ |
|
if (card->battery[0].good && card->battery[1].good) |
|
set_led(card, LED_FAULT, LED_OFF); |
|
else if (card->battery[0].warned || card->battery[1].warned) |
|
set_led(card, LED_FAULT, LED_ON); |
|
else if (!card->battery[0].good && !card->battery[1].good) |
|
set_led(card, LED_FAULT, LED_FLASH_7_0); |
|
else |
|
set_led(card, LED_FAULT, LED_FLASH_3_5); |
|
} |
|
|
|
static void init_battery_timer(void); |
|
|
|
static int check_battery(struct cardinfo *card, int battery, int status) |
|
{ |
|
if (status != card->battery[battery].good) { |
|
card->battery[battery].good = !card->battery[battery].good; |
|
card->battery[battery].last_change = jiffies; |
|
|
|
if (card->battery[battery].good) { |
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"Battery %d now good\n", battery + 1); |
|
card->battery[battery].warned = 0; |
|
} else |
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"Battery %d now FAILED\n", battery + 1); |
|
|
|
return 1; |
|
} else if (!card->battery[battery].good && |
|
!card->battery[battery].warned && |
|
time_after_eq(jiffies, card->battery[battery].last_change + |
|
(HZ * 60 * 60 * 5))) { |
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"Battery %d still FAILED after 5 hours\n", battery + 1); |
|
card->battery[battery].warned = 1; |
|
|
|
return 1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void check_batteries(struct cardinfo *card) |
|
{ |
|
/* NOTE: this must *never* be called while the card |
|
* is doing (bus-to-card) DMA, or you will need the |
|
* reset switch |
|
*/ |
|
unsigned char status; |
|
int ret1, ret2; |
|
|
|
status = readb(card->csr_remap + MEMCTRLSTATUS_BATTERY); |
|
if (debug & DEBUG_BATTERY_POLLING) |
|
dev_printk(KERN_DEBUG, &card->dev->dev, |
|
"checking battery status, 1 = %s, 2 = %s\n", |
|
(status & BATTERY_1_FAILURE) ? "FAILURE" : "OK", |
|
(status & BATTERY_2_FAILURE) ? "FAILURE" : "OK"); |
|
|
|
ret1 = check_battery(card, 0, !(status & BATTERY_1_FAILURE)); |
|
ret2 = check_battery(card, 1, !(status & BATTERY_2_FAILURE)); |
|
|
|
if (ret1 || ret2) |
|
set_fault_to_battery_status(card); |
|
} |
|
|
|
static void check_all_batteries(struct timer_list *unused) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < num_cards; i++) |
|
if (!(cards[i].flags & UM_FLAG_NO_BATT)) { |
|
struct cardinfo *card = &cards[i]; |
|
spin_lock_bh(&card->lock); |
|
if (card->Active >= 0) |
|
card->check_batteries = 1; |
|
else |
|
check_batteries(card); |
|
spin_unlock_bh(&card->lock); |
|
} |
|
|
|
init_battery_timer(); |
|
} |
|
|
|
static void init_battery_timer(void) |
|
{ |
|
timer_setup(&battery_timer, check_all_batteries, 0); |
|
battery_timer.expires = jiffies + (HZ * 60); |
|
add_timer(&battery_timer); |
|
} |
|
|
|
static void del_battery_timer(void) |
|
{ |
|
del_timer(&battery_timer); |
|
} |
|
|
|
/* |
|
* Note no locks taken out here. In a worst case scenario, we could drop |
|
* a chunk of system memory. But that should never happen, since validation |
|
* happens at open or mount time, when locks are held. |
|
* |
|
* That's crap, since doing that while some partitions are opened |
|
* or mounted will give you really nasty results. |
|
*/ |
|
static int mm_revalidate(struct gendisk *disk) |
|
{ |
|
struct cardinfo *card = disk->private_data; |
|
set_capacity(disk, card->mm_size << 1); |
|
return 0; |
|
} |
|
|
|
static int mm_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
|
{ |
|
struct cardinfo *card = bdev->bd_disk->private_data; |
|
int size = card->mm_size * (1024 / MM_HARDSECT); |
|
|
|
/* |
|
* get geometry: we have to fake one... trim the size to a |
|
* multiple of 2048 (1M): tell we have 32 sectors, 64 heads, |
|
* whatever cylinders. |
|
*/ |
|
geo->heads = 64; |
|
geo->sectors = 32; |
|
geo->cylinders = size / (geo->heads * geo->sectors); |
|
return 0; |
|
} |
|
|
|
static const struct block_device_operations mm_fops = { |
|
.owner = THIS_MODULE, |
|
.submit_bio = mm_submit_bio, |
|
.getgeo = mm_getgeo, |
|
.revalidate_disk = mm_revalidate, |
|
}; |
|
|
|
static int mm_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) |
|
{ |
|
int ret; |
|
struct cardinfo *card = &cards[num_cards]; |
|
unsigned char mem_present; |
|
unsigned char batt_status; |
|
unsigned int saved_bar, data; |
|
unsigned long csr_base; |
|
unsigned long csr_len; |
|
int magic_number; |
|
static int printed_version; |
|
|
|
if (!printed_version++) |
|
printk(KERN_INFO DRIVER_VERSION " : " DRIVER_DESC "\n"); |
|
|
|
ret = pci_enable_device(dev); |
|
if (ret) |
|
return ret; |
|
|
|
pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xF8); |
|
pci_set_master(dev); |
|
|
|
card->dev = dev; |
|
|
|
csr_base = pci_resource_start(dev, 0); |
|
csr_len = pci_resource_len(dev, 0); |
|
if (!csr_base || !csr_len) |
|
return -ENODEV; |
|
|
|
dev_printk(KERN_INFO, &dev->dev, |
|
"Micro Memory(tm) controller found (PCI Mem Module (Battery Backup))\n"); |
|
|
|
if (dma_set_mask(&dev->dev, DMA_BIT_MASK(64)) && |
|
dma_set_mask(&dev->dev, DMA_BIT_MASK(32))) { |
|
dev_printk(KERN_WARNING, &dev->dev, "NO suitable DMA found\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
ret = pci_request_regions(dev, DRIVER_NAME); |
|
if (ret) { |
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"Unable to request memory region\n"); |
|
goto failed_req_csr; |
|
} |
|
|
|
card->csr_remap = ioremap(csr_base, csr_len); |
|
if (!card->csr_remap) { |
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"Unable to remap memory region\n"); |
|
ret = -ENOMEM; |
|
|
|
goto failed_remap_csr; |
|
} |
|
|
|
dev_printk(KERN_INFO, &card->dev->dev, |
|
"CSR 0x%08lx -> 0x%p (0x%lx)\n", |
|
csr_base, card->csr_remap, csr_len); |
|
|
|
switch (card->dev->device) { |
|
case 0x5415: |
|
card->flags |= UM_FLAG_NO_BYTE_STATUS | UM_FLAG_NO_BATTREG; |
|
magic_number = 0x59; |
|
break; |
|
|
|
case 0x5425: |
|
card->flags |= UM_FLAG_NO_BYTE_STATUS; |
|
magic_number = 0x5C; |
|
break; |
|
|
|
case 0x6155: |
|
card->flags |= UM_FLAG_NO_BYTE_STATUS | |
|
UM_FLAG_NO_BATTREG | UM_FLAG_NO_BATT; |
|
magic_number = 0x99; |
|
break; |
|
|
|
default: |
|
magic_number = 0x100; |
|
break; |
|
} |
|
|
|
if (readb(card->csr_remap + MEMCTRLSTATUS_MAGIC) != magic_number) { |
|
dev_printk(KERN_ERR, &card->dev->dev, "Magic number invalid\n"); |
|
ret = -ENOMEM; |
|
goto failed_magic; |
|
} |
|
|
|
card->mm_pages[0].desc = dma_alloc_coherent(&card->dev->dev, |
|
PAGE_SIZE * 2, &card->mm_pages[0].page_dma, GFP_KERNEL); |
|
card->mm_pages[1].desc = dma_alloc_coherent(&card->dev->dev, |
|
PAGE_SIZE * 2, &card->mm_pages[1].page_dma, GFP_KERNEL); |
|
if (card->mm_pages[0].desc == NULL || |
|
card->mm_pages[1].desc == NULL) { |
|
dev_printk(KERN_ERR, &card->dev->dev, "alloc failed\n"); |
|
ret = -ENOMEM; |
|
goto failed_alloc; |
|
} |
|
reset_page(&card->mm_pages[0]); |
|
reset_page(&card->mm_pages[1]); |
|
card->Ready = 0; /* page 0 is ready */ |
|
card->Active = -1; /* no page is active */ |
|
card->bio = NULL; |
|
card->biotail = &card->bio; |
|
spin_lock_init(&card->lock); |
|
|
|
card->queue = blk_alloc_queue(NUMA_NO_NODE); |
|
if (!card->queue) { |
|
ret = -ENOMEM; |
|
goto failed_alloc; |
|
} |
|
|
|
tasklet_init(&card->tasklet, process_page, (unsigned long)card); |
|
|
|
card->check_batteries = 0; |
|
|
|
mem_present = readb(card->csr_remap + MEMCTRLSTATUS_MEMORY); |
|
switch (mem_present) { |
|
case MEM_128_MB: |
|
card->mm_size = 1024 * 128; |
|
break; |
|
case MEM_256_MB: |
|
card->mm_size = 1024 * 256; |
|
break; |
|
case MEM_512_MB: |
|
card->mm_size = 1024 * 512; |
|
break; |
|
case MEM_1_GB: |
|
card->mm_size = 1024 * 1024; |
|
break; |
|
case MEM_2_GB: |
|
card->mm_size = 1024 * 2048; |
|
break; |
|
default: |
|
card->mm_size = 0; |
|
break; |
|
} |
|
|
|
/* Clear the LED's we control */ |
|
set_led(card, LED_REMOVE, LED_OFF); |
|
set_led(card, LED_FAULT, LED_OFF); |
|
|
|
batt_status = readb(card->csr_remap + MEMCTRLSTATUS_BATTERY); |
|
|
|
card->battery[0].good = !(batt_status & BATTERY_1_FAILURE); |
|
card->battery[1].good = !(batt_status & BATTERY_2_FAILURE); |
|
card->battery[0].last_change = card->battery[1].last_change = jiffies; |
|
|
|
if (card->flags & UM_FLAG_NO_BATT) |
|
dev_printk(KERN_INFO, &card->dev->dev, |
|
"Size %d KB\n", card->mm_size); |
|
else { |
|
dev_printk(KERN_INFO, &card->dev->dev, |
|
"Size %d KB, Battery 1 %s (%s), Battery 2 %s (%s)\n", |
|
card->mm_size, |
|
batt_status & BATTERY_1_DISABLED ? "Disabled" : "Enabled", |
|
card->battery[0].good ? "OK" : "FAILURE", |
|
batt_status & BATTERY_2_DISABLED ? "Disabled" : "Enabled", |
|
card->battery[1].good ? "OK" : "FAILURE"); |
|
|
|
set_fault_to_battery_status(card); |
|
} |
|
|
|
pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &saved_bar); |
|
data = 0xffffffff; |
|
pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, data); |
|
pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &data); |
|
pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, saved_bar); |
|
data &= 0xfffffff0; |
|
data = ~data; |
|
data += 1; |
|
|
|
if (request_irq(dev->irq, mm_interrupt, IRQF_SHARED, DRIVER_NAME, |
|
card)) { |
|
dev_printk(KERN_ERR, &card->dev->dev, |
|
"Unable to allocate IRQ\n"); |
|
ret = -ENODEV; |
|
goto failed_req_irq; |
|
} |
|
|
|
dev_printk(KERN_INFO, &card->dev->dev, |
|
"Window size %d bytes, IRQ %d\n", data, dev->irq); |
|
|
|
pci_set_drvdata(dev, card); |
|
|
|
if (pci_write_cmd != 0x0F) /* If not Memory Write & Invalidate */ |
|
pci_write_cmd = 0x07; /* then Memory Write command */ |
|
|
|
if (pci_write_cmd & 0x08) { /* use Memory Write and Invalidate */ |
|
unsigned short cfg_command; |
|
pci_read_config_word(dev, PCI_COMMAND, &cfg_command); |
|
cfg_command |= 0x10; /* Memory Write & Invalidate Enable */ |
|
pci_write_config_word(dev, PCI_COMMAND, cfg_command); |
|
} |
|
pci_cmds = (pci_read_cmd << 28) | (pci_write_cmd << 24); |
|
|
|
num_cards++; |
|
|
|
if (!get_userbit(card, MEMORY_INITIALIZED)) { |
|
dev_printk(KERN_INFO, &card->dev->dev, |
|
"memory NOT initialized. Consider over-writing whole device.\n"); |
|
card->init_size = 0; |
|
} else { |
|
dev_printk(KERN_INFO, &card->dev->dev, |
|
"memory already initialized\n"); |
|
card->init_size = card->mm_size; |
|
} |
|
|
|
/* Enable ECC */ |
|
writeb(EDC_STORE_CORRECT, card->csr_remap + MEMCTRLCMD_ERRCTRL); |
|
|
|
return 0; |
|
|
|
failed_req_irq: |
|
failed_alloc: |
|
if (card->mm_pages[0].desc) |
|
dma_free_coherent(&card->dev->dev, PAGE_SIZE * 2, |
|
card->mm_pages[0].desc, |
|
card->mm_pages[0].page_dma); |
|
if (card->mm_pages[1].desc) |
|
dma_free_coherent(&card->dev->dev, PAGE_SIZE * 2, |
|
card->mm_pages[1].desc, |
|
card->mm_pages[1].page_dma); |
|
failed_magic: |
|
iounmap(card->csr_remap); |
|
failed_remap_csr: |
|
pci_release_regions(dev); |
|
failed_req_csr: |
|
|
|
return ret; |
|
} |
|
|
|
static void mm_pci_remove(struct pci_dev *dev) |
|
{ |
|
struct cardinfo *card = pci_get_drvdata(dev); |
|
|
|
tasklet_kill(&card->tasklet); |
|
free_irq(dev->irq, card); |
|
iounmap(card->csr_remap); |
|
|
|
if (card->mm_pages[0].desc) |
|
dma_free_coherent(&card->dev->dev, PAGE_SIZE * 2, |
|
card->mm_pages[0].desc, |
|
card->mm_pages[0].page_dma); |
|
if (card->mm_pages[1].desc) |
|
dma_free_coherent(&card->dev->dev, PAGE_SIZE * 2, |
|
card->mm_pages[1].desc, |
|
card->mm_pages[1].page_dma); |
|
blk_cleanup_queue(card->queue); |
|
|
|
pci_release_regions(dev); |
|
pci_disable_device(dev); |
|
} |
|
|
|
static const struct pci_device_id mm_pci_ids[] = { |
|
{PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY, PCI_DEVICE_ID_MICRO_MEMORY_5415CN)}, |
|
{PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY, PCI_DEVICE_ID_MICRO_MEMORY_5425CN)}, |
|
{PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY, PCI_DEVICE_ID_MICRO_MEMORY_6155)}, |
|
{ |
|
.vendor = 0x8086, |
|
.device = 0xB555, |
|
.subvendor = 0x1332, |
|
.subdevice = 0x5460, |
|
.class = 0x050000, |
|
.class_mask = 0, |
|
}, { /* end: all zeroes */ } |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(pci, mm_pci_ids); |
|
|
|
static struct pci_driver mm_pci_driver = { |
|
.name = DRIVER_NAME, |
|
.id_table = mm_pci_ids, |
|
.probe = mm_pci_probe, |
|
.remove = mm_pci_remove, |
|
}; |
|
|
|
static int __init mm_init(void) |
|
{ |
|
int retval, i; |
|
int err; |
|
|
|
retval = pci_register_driver(&mm_pci_driver); |
|
if (retval) |
|
return -ENOMEM; |
|
|
|
err = major_nr = register_blkdev(0, DRIVER_NAME); |
|
if (err < 0) { |
|
pci_unregister_driver(&mm_pci_driver); |
|
return -EIO; |
|
} |
|
|
|
for (i = 0; i < num_cards; i++) { |
|
mm_gendisk[i] = alloc_disk(1 << MM_SHIFT); |
|
if (!mm_gendisk[i]) |
|
goto out; |
|
} |
|
|
|
for (i = 0; i < num_cards; i++) { |
|
struct gendisk *disk = mm_gendisk[i]; |
|
sprintf(disk->disk_name, "umem%c", 'a'+i); |
|
spin_lock_init(&cards[i].lock); |
|
disk->major = major_nr; |
|
disk->first_minor = i << MM_SHIFT; |
|
disk->fops = &mm_fops; |
|
disk->private_data = &cards[i]; |
|
disk->queue = cards[i].queue; |
|
set_capacity(disk, cards[i].mm_size << 1); |
|
add_disk(disk); |
|
} |
|
|
|
init_battery_timer(); |
|
printk(KERN_INFO "MM: desc_per_page = %ld\n", DESC_PER_PAGE); |
|
/* printk("mm_init: Done. 10-19-01 9:00\n"); */ |
|
return 0; |
|
|
|
out: |
|
pci_unregister_driver(&mm_pci_driver); |
|
unregister_blkdev(major_nr, DRIVER_NAME); |
|
while (i--) |
|
put_disk(mm_gendisk[i]); |
|
return -ENOMEM; |
|
} |
|
|
|
static void __exit mm_cleanup(void) |
|
{ |
|
int i; |
|
|
|
del_battery_timer(); |
|
|
|
for (i = 0; i < num_cards ; i++) { |
|
del_gendisk(mm_gendisk[i]); |
|
put_disk(mm_gendisk[i]); |
|
} |
|
|
|
pci_unregister_driver(&mm_pci_driver); |
|
|
|
unregister_blkdev(major_nr, DRIVER_NAME); |
|
} |
|
|
|
module_init(mm_init); |
|
module_exit(mm_cleanup); |
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR); |
|
MODULE_DESCRIPTION(DRIVER_DESC); |
|
MODULE_LICENSE("GPL");
|
|
|