2005-04-16 16:20:36 -06:00
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/*
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* linux/arch/arm/drivers/block/mfmhd.c
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*
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* Copyright (C) 1995, 1996 Russell King, Dave Alan Gilbert (gilbertd@cs.man.ac.uk)
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*
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* MFM hard drive code [experimental]
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*/
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/*
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* Change list:
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*
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* 3/2/96:DAG: Started a change list :-)
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* Set the hardsect_size pointers up since we are running 256 byte
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* sectors
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* Added DMA code, put it into the rw_intr
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* Moved RCAL out of generic interrupt code - don't want to do it
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* while DMA'ing - its now in individual handlers.
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* Took interrupt handlers off task queue lists and called
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* directly - not sure of implications.
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*
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* 18/2/96:DAG: Well its reading OK I think, well enough for image file code
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* to find the image file; but now I've discovered that I actually
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* have to put some code in for image files.
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*
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* Added stuff for image files; seems to work, but I've not
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* got a multisegment image file (I don't think!).
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* Put in a hack (yep a real hack) for multiple cylinder reads.
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* Not convinced its working.
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*
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* 5/4/96:DAG: Added asm/hardware.h and use IOC_ macros
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* Rewrote dma code in mfm.S (again!) - now takes a word at a time
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* from main RAM for speed; still doesn't feel speedy!
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*
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* 20/4/96:DAG: After rewriting mfm.S a heck of a lot of times and speeding
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* things up, I've finally figured out why its so damn slow.
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* Linux is only reading a block at a time, and so you never
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* get more than 1K per disc revoloution ~=60K/second.
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*
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* 27/4/96:DAG: On Russell's advice I change ll_rw_blk.c to ask it to
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* join adjacent blocks together. Everything falls flat on its
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* face.
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* Four hours of debugging later; I hadn't realised that
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* ll_rw_blk would be so generous as to join blocks whose
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* results aren't going into consecutive buffers.
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*
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* OK; severe rehacking of mfm_rw_interrupt; now end_request's
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* as soon as its DMA'd each request. Odd thing is that
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* we are sometimes getting interrupts where we are not transferring
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* any data; why? Is that what happens when you miss? I doubt
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* it; are we too fast? No - its just at command ends. Got 240K/s
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* better than before, but RiscOS hits 480K/s
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*
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* 25/6/96:RMK: Fixed init code to allow the MFM podule to work. Increased the
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* number of errors for my Miniscribe drive (8425).
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*
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* 30/6/96:DAG: Russell suggested that a check drive 0 might turn the LEDs off
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* - so in request_done just before it clears Busy it sends a
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* check drive 0 - and the LEDs go off!!!!
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*
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* Added test for mainboard controller. - Removes need for separate
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* define.
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*
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* 13/7/96:DAG: Changed hardware sectore size to 512 in attempt to make
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* IM drivers work.
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* 21/7/96:DAG: Took out old image file stuff (accessing it now produces an IO
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* error.)
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*
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* 17/8/96:DAG: Ran through indent -kr -i8; evil - all my nice 2 character indents
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* gone :-( Hand modified afterwards.
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* Took out last remains of the older image map system.
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*
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* 22/9/96:DAG: Changed mfm.S so it will carry on DMA'ing til; BSY is dropped
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* Changed mfm_rw_intr so that it doesn't follow the error
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* code until BSY is dropped. Nope - still broke. Problem
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* may revolve around when it reads the results for the error
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* number?
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*
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*16/11/96:DAG: Modified for 2.0.18; request_irq changed
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*
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*17/12/96:RMK: Various cleanups, reorganisation, and the changes for new IO system.
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* Improved probe for onboard MFM chip - it was hanging on my A5k.
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* Added autodetect CHS code such that we don't rely on the presence
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* of an ADFS boot block. Added ioport resource manager calls so
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* that we don't clash with already-running hardware (eg. RiscPC Ether
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* card slots if someone tries this)!
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*
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* 17/1/97:RMK: Upgraded to 2.1 kernels.
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*
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* 4/3/98:RMK: Changed major number to 21.
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*
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* 27/6/98:RMK: Changed asm/delay.h to linux/delay.h for mdelay().
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*/
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/*
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* Possible enhancements:
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* Multi-thread the code so that it is possible that while one drive
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* is seeking, the other one can be reading data/seeking as well.
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* This would be a performance boost with dual drive systems.
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*/
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#include <linux/module.h>
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <linux/genhd.h>
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#include <linux/major.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/blkpg.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include <asm/dma.h>
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#include <asm/hardware.h>
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#include <asm/ecard.h>
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#include <asm/hardware/ioc.h>
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static void (*do_mfm)(void) = NULL;
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static struct request_queue *mfm_queue;
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static DEFINE_SPINLOCK(mfm_lock);
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#define MAJOR_NR MFM_ACORN_MAJOR
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#define QUEUE (mfm_queue)
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#define CURRENT elv_next_request(mfm_queue)
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/*
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* Configuration section
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*
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* This is the maximum number of drives that we accept
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*/
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#define MFM_MAXDRIVES 2
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/*
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* Linux I/O address of onboard MFM controller or 0 to disable this
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*/
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#define ONBOARD_MFM_ADDRESS ((0x002d0000 >> 2) | 0x80000000)
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/*
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* Uncomment this to enable debugging in the MFM driver...
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*/
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#ifndef DEBUG
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/*#define DEBUG */
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#endif
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/*
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* End of configuration
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*/
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/*
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* This structure contains all information to do with a particular physical
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* device.
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*/
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struct mfm_info {
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unsigned char sectors;
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unsigned char heads;
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unsigned short cylinders;
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unsigned short lowcurrent;
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unsigned short precomp;
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#define NO_TRACK -1
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#define NEED_1_RECAL -2
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#define NEED_2_RECAL -3
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int cylinder;
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struct {
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char recal;
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char report;
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char abort;
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} errors;
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} mfm_info[MFM_MAXDRIVES];
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#define MFM_DRV_INFO mfm_info[raw_cmd.dev]
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/* Stuff from the assembly routines */
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extern unsigned int hdc63463_baseaddress; /* Controller base address */
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extern unsigned int hdc63463_irqpolladdress; /* Address to read to test for int */
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extern unsigned int hdc63463_irqpollmask; /* Mask for irq register */
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extern unsigned int hdc63463_dataptr; /* Pointer to kernel data space to DMA */
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extern int hdc63463_dataleft; /* Number of bytes left to transfer */
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static int lastspecifieddrive;
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static unsigned Busy;
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static unsigned int PartFragRead; /* The number of sectors which have been read
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during a partial read split over two
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cylinders. If 0 it means a partial
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read did not occur. */
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static unsigned int PartFragRead_RestartBlock; /* Where to restart on a split access */
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static unsigned int PartFragRead_SectorsLeft; /* Where to restart on a split access */
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static int Sectors256LeftInCurrent; /* i.e. 256 byte sectors left in current */
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static int SectorsLeftInRequest; /* i.e. blocks left in the thing mfm_request was called for */
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static int Copy_Sector; /* The 256 byte sector we are currently at - fragments need to know
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where to take over */
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static char *Copy_buffer;
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static void mfm_seek(void);
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static void mfm_rerequest(void);
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static void mfm_request(void);
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static void mfm_specify (void);
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static void issue_request(unsigned int block, unsigned int nsect,
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struct request *req);
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static unsigned int mfm_addr; /* Controller address */
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static unsigned int mfm_IRQPollLoc; /* Address to read for IRQ information */
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static unsigned int mfm_irqenable; /* Podule IRQ enable location */
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static unsigned char mfm_irq; /* Interrupt number */
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static int mfm_drives = 0; /* drives available */
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static int mfm_status = 0; /* interrupt status */
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static int *errors;
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static struct rawcmd {
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unsigned int dev;
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unsigned int cylinder;
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unsigned int head;
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unsigned int sector;
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unsigned int cmdtype;
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unsigned int cmdcode;
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unsigned char cmddata[16];
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unsigned int cmdlen;
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} raw_cmd;
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static unsigned char result[16];
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static struct cont {
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void (*interrupt) (void); /* interrupt handler */
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void (*error) (void); /* error handler */
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void (*redo) (void); /* redo handler */
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void (*done) (int st); /* done handler */
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} *cont = NULL;
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#if 0
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static struct tq_struct mfm_tq = {0, 0, (void (*)(void *)) NULL, 0};
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#endif
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int number_mfm_drives = 1;
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/* ------------------------------------------------------------------------------------------ */
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/*
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* From the HD63463 data sheet from Hitachi Ltd.
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*/
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#define MFM_COMMAND (mfm_addr + 0)
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#define MFM_DATAOUT (mfm_addr + 1)
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#define MFM_STATUS (mfm_addr + 8)
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#define MFM_DATAIN (mfm_addr + 9)
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#define CMD_ABT 0xF0 /* Abort */
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#define CMD_SPC 0xE8 /* Specify */
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#define CMD_TST 0xE0 /* Test */
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#define CMD_RCLB 0xC8 /* Recalibrate */
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#define CMD_SEK 0xC0 /* Seek */
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#define CMD_WFS 0xAB /* Write Format Skew */
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#define CMD_WFM 0xA3 /* Write Format */
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#define CMD_MTB 0x90 /* Memory to buffer */
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#define CMD_CMPD 0x88 /* Compare data */
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#define CMD_WD 0x87 /* Write data */
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#define CMD_RED 0x70 /* Read erroneous data */
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#define CMD_RIS 0x68 /* Read ID skew */
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#define CMD_FID 0x61 /* Find ID */
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#define CMD_RID 0x60 /* Read ID */
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#define CMD_BTM 0x50 /* Buffer to memory */
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#define CMD_CKD 0x48 /* Check data */
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#define CMD_RD 0x40 /* Read data */
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#define CMD_OPBW 0x38 /* Open buffer write */
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#define CMD_OPBR 0x30 /* Open buffer read */
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#define CMD_CKV 0x28 /* Check drive */
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#define CMD_CKE 0x20 /* Check ECC */
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#define CMD_POD 0x18 /* Polling disable */
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#define CMD_POL 0x10 /* Polling enable */
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#define CMD_RCAL 0x08 /* Recall */
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#define STAT_BSY 0x8000 /* Busy */
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#define STAT_CPR 0x4000 /* Command Parameter Rejection */
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#define STAT_CED 0x2000 /* Command end */
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#define STAT_SED 0x1000 /* Seek end */
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#define STAT_DER 0x0800 /* Drive error */
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#define STAT_ABN 0x0400 /* Abnormal end */
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#define STAT_POL 0x0200 /* Polling */
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/* ------------------------------------------------------------------------------------------ */
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#ifdef DEBUG
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static void console_printf(const char *fmt,...)
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{
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static char buffer[2048]; /* Arbitary! */
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extern void console_print(const char *);
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unsigned long flags;
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va_list ap;
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local_irq_save(flags);
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va_start(ap, fmt);
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vsprintf(buffer, fmt, ap);
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console_print(buffer);
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va_end(fmt);
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local_irq_restore(flags);
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}; /* console_printf */
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#define DBG(x...) console_printf(x)
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#else
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#define DBG(x...)
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#endif
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static void print_status(void)
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{
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char *error;
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static char *errors[] = {
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"no error",
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"command aborted",
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"invalid command",
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"parameter error",
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"not initialised",
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"rejected TEST",
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"no useld",
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"write fault",
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"not ready",
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"no scp",
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"in seek",
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"invalid NCA",
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"invalid step rate",
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"seek error",
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"over run",
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"invalid PHA",
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"data field EEC error",
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"data field CRC error",
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"error corrected",
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"data field fatal error",
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"no data am",
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"not hit",
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"ID field CRC error",
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"time over",
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"no ID am",
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"not writable"
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};
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if (result[1] < 0x65)
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error = errors[result[1] >> 2];
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else
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error = "unknown";
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printk("(");
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if (mfm_status & STAT_BSY) printk("BSY ");
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if (mfm_status & STAT_CPR) printk("CPR ");
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if (mfm_status & STAT_CED) printk("CED ");
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if (mfm_status & STAT_SED) printk("SED ");
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if (mfm_status & STAT_DER) printk("DER ");
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if (mfm_status & STAT_ABN) printk("ABN ");
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if (mfm_status & STAT_POL) printk("POL ");
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printk(") SSB = %X (%s)\n", result[1], error);
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}
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/* ------------------------------------------------------------------------------------- */
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static void issue_command(int command, unsigned char *cmdb, int len)
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{
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|
|
int status;
|
|
|
|
#ifdef DEBUG
|
|
|
|
int i;
|
|
|
|
console_printf("issue_command: %02X: ", command);
|
|
|
|
for (i = 0; i < len; i++)
|
|
|
|
console_printf("%02X ", cmdb[i]);
|
|
|
|
console_printf("\n");
|
|
|
|
#endif
|
|
|
|
|
|
|
|
do {
|
|
|
|
status = inw(MFM_STATUS);
|
|
|
|
} while (status & (STAT_BSY | STAT_POL));
|
|
|
|
DBG("issue_command: status after pol/bsy loop: %02X:\n ", status >> 8);
|
|
|
|
|
|
|
|
if (status & (STAT_CPR | STAT_CED | STAT_SED | STAT_DER | STAT_ABN)) {
|
|
|
|
outw(CMD_RCAL, MFM_COMMAND);
|
|
|
|
while (inw(MFM_STATUS) & STAT_BSY);
|
|
|
|
}
|
|
|
|
status = inw(MFM_STATUS);
|
|
|
|
DBG("issue_command: status before parameter issue: %02X:\n ", status >> 8);
|
|
|
|
|
|
|
|
while (len > 0) {
|
|
|
|
outw(cmdb[1] | (cmdb[0] << 8), MFM_DATAOUT);
|
|
|
|
len -= 2;
|
|
|
|
cmdb += 2;
|
|
|
|
}
|
|
|
|
status = inw(MFM_STATUS);
|
|
|
|
DBG("issue_command: status before command issue: %02X:\n ", status >> 8);
|
|
|
|
|
|
|
|
outw(command, MFM_COMMAND);
|
|
|
|
status = inw(MFM_STATUS);
|
|
|
|
DBG("issue_command: status immediately after command issue: %02X:\n ", status >> 8);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void wait_for_completion(void)
|
|
|
|
{
|
|
|
|
while ((mfm_status = inw(MFM_STATUS)) & STAT_BSY);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void wait_for_command_end(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
while (!((mfm_status = inw(MFM_STATUS)) & STAT_CED));
|
|
|
|
|
|
|
|
for (i = 0; i < 16;) {
|
|
|
|
int in;
|
|
|
|
in = inw(MFM_DATAIN);
|
|
|
|
result[i++] = in >> 8;
|
|
|
|
result[i++] = in;
|
|
|
|
}
|
|
|
|
outw (CMD_RCAL, MFM_COMMAND);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ------------------------------------------------------------------------------------- */
|
|
|
|
|
|
|
|
static void mfm_rw_intr(void)
|
|
|
|
{
|
|
|
|
int old_status; /* Holds status on entry, we read to see if the command just finished */
|
|
|
|
#ifdef DEBUG
|
|
|
|
console_printf("mfm_rw_intr...dataleft=%d\n", hdc63463_dataleft);
|
|
|
|
print_status();
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Now don't handle the error until BSY drops */
|
|
|
|
if ((mfm_status & (STAT_DER | STAT_ABN)) && ((mfm_status&STAT_BSY)==0)) {
|
|
|
|
/* Something has gone wrong - let's try that again */
|
|
|
|
outw(CMD_RCAL, MFM_COMMAND); /* Clear interrupt condition */
|
|
|
|
if (cont) {
|
|
|
|
DBG("mfm_rw_intr: DER/ABN err\n");
|
|
|
|
cont->error();
|
|
|
|
cont->redo();
|
|
|
|
};
|
|
|
|
return;
|
|
|
|
};
|
|
|
|
|
|
|
|
/* OK so what ever happened it's not an error, now I reckon we are left between
|
|
|
|
a choice of command end or some data which is ready to be collected */
|
|
|
|
/* I think we have to transfer data while the interrupt line is on and its
|
|
|
|
not any other type of interrupt */
|
|
|
|
if (CURRENT->cmd == WRITE) {
|
|
|
|
extern void hdc63463_writedma(void);
|
|
|
|
if ((hdc63463_dataleft <= 0) && (!(mfm_status & STAT_CED))) {
|
|
|
|
printk("mfm_rw_intr: Apparent DMA write request when no more to DMA\n");
|
|
|
|
if (cont) {
|
|
|
|
cont->error();
|
|
|
|
cont->redo();
|
|
|
|
};
|
|
|
|
return;
|
|
|
|
};
|
|
|
|
hdc63463_writedma();
|
|
|
|
} else {
|
|
|
|
extern void hdc63463_readdma(void);
|
|
|
|
if ((hdc63463_dataleft <= 0) && (!(mfm_status & STAT_CED))) {
|
|
|
|
printk("mfm_rw_intr: Apparent DMA read request when no more to DMA\n");
|
|
|
|
if (cont) {
|
|
|
|
cont->error();
|
|
|
|
cont->redo();
|
|
|
|
};
|
|
|
|
return;
|
|
|
|
};
|
|
|
|
DBG("Going to try read dma..............status=0x%x, buffer=%p\n", mfm_status, hdc63463_dataptr);
|
|
|
|
hdc63463_readdma();
|
|
|
|
}; /* Read */
|
|
|
|
|
|
|
|
if (hdc63463_dataptr != ((unsigned int) Copy_buffer + 256)) {
|
|
|
|
/* If we didn't actually manage to get any data on this interrupt - but why? We got the interrupt */
|
|
|
|
/* Ah - well looking at the status its just when we get command end; so no problem */
|
|
|
|
/*console_printf("mfm: dataptr mismatch. dataptr=0x%08x Copy_buffer+256=0x%08p\n",
|
|
|
|
hdc63463_dataptr,Copy_buffer+256);
|
|
|
|
print_status(); */
|
|
|
|
} else {
|
|
|
|
Sectors256LeftInCurrent--;
|
|
|
|
Copy_buffer += 256;
|
|
|
|
Copy_Sector++;
|
|
|
|
|
|
|
|
/* We have come to the end of this request */
|
|
|
|
if (!Sectors256LeftInCurrent) {
|
|
|
|
DBG("mfm: end_request for CURRENT=0x%p CURRENT(sector=%d current_nr_sectors=%d nr_sectors=%d)\n",
|
|
|
|
CURRENT, CURRENT->sector, CURRENT->current_nr_sectors, CURRENT->nr_sectors);
|
|
|
|
|
|
|
|
CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
|
|
|
|
CURRENT->sector += CURRENT->current_nr_sectors;
|
|
|
|
SectorsLeftInRequest -= CURRENT->current_nr_sectors;
|
|
|
|
|
|
|
|
end_request(CURRENT, 1);
|
|
|
|
if (SectorsLeftInRequest) {
|
|
|
|
hdc63463_dataptr = (unsigned int) CURRENT->buffer;
|
|
|
|
Copy_buffer = CURRENT->buffer;
|
|
|
|
Sectors256LeftInCurrent = CURRENT->current_nr_sectors * 2;
|
|
|
|
errors = &(CURRENT->errors);
|
|
|
|
/* These should match the present calculations of the next logical sector
|
|
|
|
on the device
|
|
|
|
Copy_Sector=CURRENT->sector*2; */
|
|
|
|
|
|
|
|
if (Copy_Sector != CURRENT->sector * 2)
|
|
|
|
#ifdef DEBUG
|
|
|
|
/*console_printf*/printk("mfm: Copy_Sector mismatch. Copy_Sector=%d CURRENT->sector*2=%d\n",
|
|
|
|
Copy_Sector, CURRENT->sector * 2);
|
|
|
|
#else
|
|
|
|
printk("mfm: Copy_Sector mismatch! Eek!\n");
|
|
|
|
#endif
|
|
|
|
}; /* CURRENT */
|
|
|
|
}; /* Sectors256LeftInCurrent */
|
|
|
|
};
|
|
|
|
|
|
|
|
old_status = mfm_status;
|
|
|
|
mfm_status = inw(MFM_STATUS);
|
|
|
|
if (mfm_status & (STAT_DER | STAT_ABN)) {
|
|
|
|
/* Something has gone wrong - let's try that again */
|
|
|
|
if (cont) {
|
|
|
|
DBG("mfm_rw_intr: DER/ABN error\n");
|
|
|
|
cont->error();
|
|
|
|
cont->redo();
|
|
|
|
};
|
|
|
|
return;
|
|
|
|
};
|
|
|
|
|
|
|
|
/* If this code wasn't entered due to command_end but there is
|
|
|
|
now a command end we must read the command results out. If it was
|
|
|
|
entered like this then mfm_interrupt_handler would have done the
|
|
|
|
job. */
|
|
|
|
if ((!((old_status & (STAT_CPR | STAT_BSY)) == STAT_CPR)) &&
|
|
|
|
((mfm_status & (STAT_CPR | STAT_BSY)) == STAT_CPR)) {
|
|
|
|
int len = 0;
|
|
|
|
while (len < 16) {
|
|
|
|
int in;
|
|
|
|
in = inw(MFM_DATAIN);
|
|
|
|
result[len++] = in >> 8;
|
|
|
|
result[len++] = in;
|
|
|
|
};
|
|
|
|
}; /* Result read */
|
|
|
|
|
|
|
|
/*console_printf ("mfm_rw_intr nearexit [%02X]\n", __raw_readb(mfm_IRQPollLoc)); */
|
|
|
|
|
|
|
|
/* If end of command move on */
|
|
|
|
if (mfm_status & (STAT_CED)) {
|
|
|
|
outw(CMD_RCAL, MFM_COMMAND); /* Clear interrupt condition */
|
|
|
|
/* End of command - trigger the next command */
|
|
|
|
if (cont) {
|
|
|
|
cont->done(1);
|
|
|
|
}
|
|
|
|
DBG("mfm_rw_intr: returned from cont->done\n");
|
|
|
|
} else {
|
|
|
|
/* Its going to generate another interrupt */
|
|
|
|
do_mfm = mfm_rw_intr;
|
|
|
|
};
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mfm_setup_rw(void)
|
|
|
|
{
|
|
|
|
DBG("setting up for rw...\n");
|
|
|
|
|
|
|
|
do_mfm = mfm_rw_intr;
|
|
|
|
issue_command(raw_cmd.cmdcode, raw_cmd.cmddata, raw_cmd.cmdlen);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mfm_recal_intr(void)
|
|
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
|
|
console_printf("recal intr - status = ");
|
|
|
|
print_status();
|
|
|
|
#endif
|
|
|
|
outw(CMD_RCAL, MFM_COMMAND); /* Clear interrupt condition */
|
|
|
|
if (mfm_status & (STAT_DER | STAT_ABN)) {
|
|
|
|
printk("recal failed\n");
|
|
|
|
MFM_DRV_INFO.cylinder = NEED_2_RECAL;
|
|
|
|
if (cont) {
|
|
|
|
cont->error();
|
|
|
|
cont->redo();
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
/* Thats seek end - we are finished */
|
|
|
|
if (mfm_status & STAT_SED) {
|
|
|
|
issue_command(CMD_POD, NULL, 0);
|
|
|
|
MFM_DRV_INFO.cylinder = 0;
|
|
|
|
mfm_seek();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
/* Command end without seek end (see data sheet p.20) for parallel seek
|
|
|
|
- we have to send a POL command to wait for the seek */
|
|
|
|
if (mfm_status & STAT_CED) {
|
|
|
|
do_mfm = mfm_recal_intr;
|
|
|
|
issue_command(CMD_POL, NULL, 0);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
printk("recal: unknown status\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mfm_seek_intr(void)
|
|
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
|
|
console_printf("seek intr - status = ");
|
|
|
|
print_status();
|
|
|
|
#endif
|
|
|
|
outw(CMD_RCAL, MFM_COMMAND); /* Clear interrupt condition */
|
|
|
|
if (mfm_status & (STAT_DER | STAT_ABN)) {
|
|
|
|
printk("seek failed\n");
|
|
|
|
MFM_DRV_INFO.cylinder = NEED_2_RECAL;
|
|
|
|
if (cont) {
|
|
|
|
cont->error();
|
|
|
|
cont->redo();
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (mfm_status & STAT_SED) {
|
|
|
|
issue_command(CMD_POD, NULL, 0);
|
|
|
|
MFM_DRV_INFO.cylinder = raw_cmd.cylinder;
|
|
|
|
mfm_seek();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (mfm_status & STAT_CED) {
|
|
|
|
do_mfm = mfm_seek_intr;
|
|
|
|
issue_command(CMD_POL, NULL, 0);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
printk("seek: unknown status\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
/* IDEA2 seems to work better - its what RiscOS sets my
|
|
|
|
* disc to - on its SECOND call to specify!
|
|
|
|
*/
|
|
|
|
#define IDEA2
|
|
|
|
#ifndef IDEA2
|
|
|
|
#define SPEC_SL 0x16
|
|
|
|
#define SPEC_SH 0xa9 /* Step pulse high=21, Record Length=001 (256 bytes) */
|
|
|
|
#else
|
|
|
|
#define SPEC_SL 0x00 /* OM2 - SL - step pulse low */
|
|
|
|
#define SPEC_SH 0x21 /* Step pulse high=4, Record Length=001 (256 bytes) */
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static void mfm_setupspecify (int drive, unsigned char *cmdb)
|
|
|
|
{
|
|
|
|
cmdb[0] = 0x1f; /* OM0 - !SECT,!MOD,!DIF,PADP,ECD,CRCP,CRCI,ACOR */
|
|
|
|
cmdb[1] = 0xc3; /* OM1 - DTM,BRST,!CEDM,!SEDM,!DERM,0,AMEX,PSK */
|
|
|
|
cmdb[2] = SPEC_SL; /* OM2 - SL - step pulse low */
|
|
|
|
cmdb[3] = (number_mfm_drives == 1) ? 0x02 : 0x06; /* 1 or 2 drives */
|
|
|
|
cmdb[4] = 0xfc | ((mfm_info[drive].cylinders - 1) >> 8);/* RW time over/high part of number of cylinders */
|
|
|
|
cmdb[5] = mfm_info[drive].cylinders - 1; /* low part of number of cylinders */
|
|
|
|
cmdb[6] = mfm_info[drive].heads - 1; /* Number of heads */
|
|
|
|
cmdb[7] = mfm_info[drive].sectors - 1; /* Number of sectors */
|
|
|
|
cmdb[8] = SPEC_SH;
|
|
|
|
cmdb[9] = 0x0a; /* gap length 1 */
|
|
|
|
cmdb[10] = 0x0d; /* gap length 2 */
|
|
|
|
cmdb[11] = 0x0c; /* gap length 3 */
|
|
|
|
cmdb[12] = (mfm_info[drive].precomp - 1) >> 8; /* pre comp cylinder */
|
|
|
|
cmdb[13] = mfm_info[drive].precomp - 1;
|
|
|
|
cmdb[14] = (mfm_info[drive].lowcurrent - 1) >> 8; /* Low current cylinder */
|
|
|
|
cmdb[15] = mfm_info[drive].lowcurrent - 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mfm_specify (void)
|
|
|
|
{
|
|
|
|
unsigned char cmdb[16];
|
|
|
|
|
|
|
|
DBG("specify...dev=%d lastspecified=%d\n", raw_cmd.dev, lastspecifieddrive);
|
|
|
|
mfm_setupspecify (raw_cmd.dev, cmdb);
|
|
|
|
|
|
|
|
issue_command (CMD_SPC, cmdb, 16);
|
|
|
|
/* Ensure that we will do another specify if we move to the other drive */
|
|
|
|
lastspecifieddrive = raw_cmd.dev;
|
|
|
|
wait_for_completion();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mfm_seek(void)
|
|
|
|
{
|
|
|
|
unsigned char cmdb[4];
|
|
|
|
|
|
|
|
DBG("seeking...\n");
|
|
|
|
if (MFM_DRV_INFO.cylinder < 0) {
|
|
|
|
do_mfm = mfm_recal_intr;
|
|
|
|
DBG("mfm_seek: about to call specify\n");
|
|
|
|
mfm_specify (); /* DAG added this */
|
|
|
|
|
|
|
|
cmdb[0] = raw_cmd.dev + 1;
|
|
|
|
cmdb[1] = 0;
|
|
|
|
|
|
|
|
issue_command(CMD_RCLB, cmdb, 2);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (MFM_DRV_INFO.cylinder != raw_cmd.cylinder) {
|
|
|
|
cmdb[0] = raw_cmd.dev + 1;
|
|
|
|
cmdb[1] = 0; /* raw_cmd.head; DAG: My data sheet says this should be 0 */
|
|
|
|
cmdb[2] = raw_cmd.cylinder >> 8;
|
|
|
|
cmdb[3] = raw_cmd.cylinder;
|
|
|
|
|
|
|
|
do_mfm = mfm_seek_intr;
|
|
|
|
issue_command(CMD_SEK, cmdb, 4);
|
|
|
|
} else
|
|
|
|
mfm_setup_rw();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mfm_initialise(void)
|
|
|
|
{
|
|
|
|
DBG("init...\n");
|
|
|
|
mfm_seek();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void request_done(int uptodate)
|
|
|
|
{
|
|
|
|
DBG("mfm:request_done\n");
|
|
|
|
if (uptodate) {
|
|
|
|
unsigned char block[2] = {0, 0};
|
|
|
|
|
|
|
|
/* Apparently worked - let's check bytes left to DMA */
|
|
|
|
if (hdc63463_dataleft != (PartFragRead_SectorsLeft * 256)) {
|
|
|
|
printk("mfm: request_done - dataleft=%d - should be %d - Eek!\n", hdc63463_dataleft, PartFragRead_SectorsLeft * 256);
|
|
|
|
end_request(CURRENT, 0);
|
|
|
|
Busy = 0;
|
|
|
|
};
|
|
|
|
/* Potentially this means that we've done; but we might be doing
|
|
|
|
a partial access, (over two cylinders) or we may have a number
|
|
|
|
of fragments in an image file. First let's deal with partial accesss
|
|
|
|
*/
|
|
|
|
if (PartFragRead) {
|
|
|
|
/* Yep - a partial access */
|
|
|
|
|
|
|
|
/* and issue the remainder */
|
|
|
|
issue_request(PartFragRead_RestartBlock, PartFragRead_SectorsLeft, CURRENT);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ah well - perhaps there is another fragment to go */
|
|
|
|
|
|
|
|
/* Increment pointers/counts to start of next fragment */
|
|
|
|
if (SectorsLeftInRequest > 0) printk("mfm: SectorsLeftInRequest>0 - Eek! Shouldn't happen!\n");
|
|
|
|
|
|
|
|
/* No - its the end of the line */
|
|
|
|
/* end_request's should have happened at the end of sector DMAs */
|
|
|
|
/* Turns Drive LEDs off - may slow it down? */
|
|
|
|
if (!elv_next_request(QUEUE))
|
|
|
|
issue_command(CMD_CKV, block, 2);
|
|
|
|
|
|
|
|
Busy = 0;
|
|
|
|
DBG("request_done: About to mfm_request\n");
|
|
|
|
/* Next one please */
|
|
|
|
mfm_request(); /* Moved from mfm_rw_intr */
|
|
|
|
DBG("request_done: returned from mfm_request\n");
|
|
|
|
} else {
|
|
|
|
printk("mfm:request_done: update=0\n");
|
|
|
|
end_request(CURRENT, 0);
|
|
|
|
Busy = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void error_handler(void)
|
|
|
|
{
|
|
|
|
printk("error detected... status = ");
|
|
|
|
print_status();
|
|
|
|
(*errors)++;
|
|
|
|
if (*errors > MFM_DRV_INFO.errors.abort)
|
|
|
|
cont->done(0);
|
|
|
|
if (*errors > MFM_DRV_INFO.errors.recal)
|
|
|
|
MFM_DRV_INFO.cylinder = NEED_2_RECAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void rw_interrupt(void)
|
|
|
|
{
|
|
|
|
printk("rw_interrupt\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct cont rw_cont =
|
|
|
|
{
|
|
|
|
rw_interrupt,
|
|
|
|
error_handler,
|
|
|
|
mfm_rerequest,
|
|
|
|
request_done
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Actually gets round to issuing the request - note everything at this
|
|
|
|
* point is in 256 byte sectors not Linux 512 byte blocks
|
|
|
|
*/
|
|
|
|
static void issue_request(unsigned int block, unsigned int nsect,
|
|
|
|
struct request *req)
|
|
|
|
{
|
|
|
|
struct gendisk *disk = req->rq_disk;
|
|
|
|
struct mfm_info *p = disk->private_data;
|
|
|
|
int track, start_head, start_sector;
|
|
|
|
int sectors_to_next_cyl;
|
|
|
|
dev = p - mfm_info;
|
|
|
|
|
|
|
|
track = block / p->sectors;
|
|
|
|
start_sector = block % p->sectors;
|
|
|
|
start_head = track % p->heads;
|
|
|
|
|
|
|
|
/* First get the number of whole tracks which are free before the next
|
|
|
|
track */
|
|
|
|
sectors_to_next_cyl = (p->heads - (start_head + 1)) * p->sectors;
|
|
|
|
/* Then add in the number of sectors left on this track */
|
|
|
|
sectors_to_next_cyl += (p->sectors - start_sector);
|
|
|
|
|
|
|
|
DBG("issue_request: mfm_info[dev].sectors=%d track=%d\n", p->sectors, track);
|
|
|
|
|
|
|
|
raw_cmd.dev = dev;
|
|
|
|
raw_cmd.sector = start_sector;
|
|
|
|
raw_cmd.head = start_head;
|
|
|
|
raw_cmd.cylinder = track / p->heads;
|
|
|
|
raw_cmd.cmdtype = CURRENT->cmd;
|
|
|
|
raw_cmd.cmdcode = CURRENT->cmd == WRITE ? CMD_WD : CMD_RD;
|
|
|
|
raw_cmd.cmddata[0] = dev + 1; /* DAG: +1 to get US */
|
|
|
|
raw_cmd.cmddata[1] = raw_cmd.head;
|
|
|
|
raw_cmd.cmddata[2] = raw_cmd.cylinder >> 8;
|
|
|
|
raw_cmd.cmddata[3] = raw_cmd.cylinder;
|
|
|
|
raw_cmd.cmddata[4] = raw_cmd.head;
|
|
|
|
raw_cmd.cmddata[5] = raw_cmd.sector;
|
|
|
|
|
|
|
|
/* Was == and worked - how the heck??? */
|
|
|
|
if (lastspecifieddrive != raw_cmd.dev)
|
|
|
|
mfm_specify ();
|
|
|
|
|
|
|
|
if (nsect <= sectors_to_next_cyl) {
|
|
|
|
raw_cmd.cmddata[6] = nsect >> 8;
|
|
|
|
raw_cmd.cmddata[7] = nsect;
|
|
|
|
PartFragRead = 0; /* All in one */
|
|
|
|
PartFragRead_SectorsLeft = 0; /* Must set this - used in DMA calcs */
|
|
|
|
} else {
|
|
|
|
raw_cmd.cmddata[6] = sectors_to_next_cyl >> 8;
|
|
|
|
raw_cmd.cmddata[7] = sectors_to_next_cyl;
|
|
|
|
PartFragRead = sectors_to_next_cyl; /* only do this many this time */
|
|
|
|
PartFragRead_RestartBlock = block + sectors_to_next_cyl; /* Where to restart from */
|
|
|
|
PartFragRead_SectorsLeft = nsect - sectors_to_next_cyl;
|
|
|
|
}
|
|
|
|
raw_cmd.cmdlen = 8;
|
|
|
|
|
|
|
|
/* Setup DMA pointers */
|
|
|
|
hdc63463_dataptr = (unsigned int) Copy_buffer;
|
|
|
|
hdc63463_dataleft = nsect * 256; /* Better way? */
|
|
|
|
|
|
|
|
DBG("mfm%c: %sing: CHS=%d/%d/%d, sectors=%d, buffer=0x%08lx (%p)\n",
|
|
|
|
raw_cmd.dev + 'a', (CURRENT->cmd == READ) ? "read" : "writ",
|
|
|
|
raw_cmd.cylinder,
|
|
|
|
raw_cmd.head,
|
|
|
|
raw_cmd.sector, nsect, (unsigned long) Copy_buffer, CURRENT);
|
|
|
|
|
|
|
|
cont = &rw_cont;
|
|
|
|
errors = &(CURRENT->errors);
|
|
|
|
#if 0
|
|
|
|
mfm_tq.routine = (void (*)(void *)) mfm_initialise;
|
|
|
|
queue_task(&mfm_tq, &tq_immediate);
|
|
|
|
mark_bh(IMMEDIATE_BH);
|
|
|
|
#else
|
|
|
|
mfm_initialise();
|
|
|
|
#endif
|
|
|
|
} /* issue_request */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called when an error has just happened - need to trick mfm_request
|
|
|
|
* into thinking we weren't busy
|
|
|
|
*
|
|
|
|
* Turn off ints - mfm_request expects them this way
|
|
|
|
*/
|
|
|
|
static void mfm_rerequest(void)
|
|
|
|
{
|
|
|
|
DBG("mfm_rerequest\n");
|
|
|
|
cli();
|
|
|
|
Busy = 0;
|
|
|
|
mfm_request();
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct gendisk *mfm_gendisk[2];
|
|
|
|
|
|
|
|
static void mfm_request(void)
|
|
|
|
{
|
|
|
|
DBG("mfm_request CURRENT=%p Busy=%d\n", CURRENT, Busy);
|
|
|
|
|
|
|
|
/* If we are still processing then return; we will get called again */
|
|
|
|
if (Busy) {
|
|
|
|
/* Again seems to be common in 1.3.45 */
|
|
|
|
/*DBG*/printk("mfm_request: Exiting due to busy\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
Busy = 1;
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
unsigned int block, nsect;
|
|
|
|
struct gendisk *disk;
|
|
|
|
|
|
|
|
DBG("mfm_request: loop start\n");
|
|
|
|
sti();
|
|
|
|
|
|
|
|
DBG("mfm_request: before !CURRENT\n");
|
|
|
|
|
|
|
|
if (!CURRENT) {
|
|
|
|
printk("mfm_request: Exiting due to empty queue (pre)\n");
|
|
|
|
do_mfm = NULL;
|
|
|
|
Busy = 0;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
DBG("mfm_request: before arg extraction\n");
|
|
|
|
|
|
|
|
disk = CURRENT->rq_disk;
|
|
|
|
block = CURRENT->sector;
|
|
|
|
nsect = CURRENT->nr_sectors;
|
|
|
|
if (block >= get_capacity(disk) ||
|
|
|
|
block+nsect > get_capacity(disk)) {
|
|
|
|
printk("%s: bad access: block=%d, count=%d, nr_sects=%ld\n",
|
|
|
|
disk->disk_name, block, nsect, get_capacity(disk));
|
|
|
|
printk("mfm: continue 1\n");
|
|
|
|
end_request(CURRENT, 0);
|
|
|
|
Busy = 0;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* DAG: Linux doesn't cope with this - even though it has an array telling
|
|
|
|
it the hardware block size - silly */
|
|
|
|
block <<= 1; /* Now in 256 byte sectors */
|
|
|
|
nsect <<= 1; /* Ditto */
|
|
|
|
|
|
|
|
SectorsLeftInRequest = nsect >> 1;
|
|
|
|
Sectors256LeftInCurrent = CURRENT->current_nr_sectors * 2;
|
|
|
|
Copy_buffer = CURRENT->buffer;
|
|
|
|
Copy_Sector = CURRENT->sector << 1;
|
|
|
|
|
|
|
|
DBG("mfm_request: block after offset=%d\n", block);
|
|
|
|
|
|
|
|
if (CURRENT->cmd != READ && CURRENT->cmd != WRITE) {
|
|
|
|
printk("unknown mfm-command %d\n", CURRENT->cmd);
|
|
|
|
end_request(CURRENT, 0);
|
|
|
|
Busy = 0;
|
|
|
|
printk("mfm: continue 4\n");
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
issue_request(block, nsect, CURRENT);
|
|
|
|
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
DBG("mfm_request: Dropping out bottom\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
static void do_mfm_request(request_queue_t *q)
|
|
|
|
{
|
|
|
|
DBG("do_mfm_request: about to mfm_request\n");
|
|
|
|
mfm_request();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mfm_interrupt_handler(int unused, void *dev_id, struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
void (*handler) (void) = do_mfm;
|
|
|
|
|
|
|
|
do_mfm = NULL;
|
|
|
|
|
|
|
|
DBG("mfm_interrupt_handler (handler=0x%p)\n", handler);
|
|
|
|
|
|
|
|
mfm_status = inw(MFM_STATUS);
|
|
|
|
|
|
|
|
/* If CPR (Command Parameter Reject) and not busy it means that the command
|
|
|
|
has some return message to give us */
|
|
|
|
if ((mfm_status & (STAT_CPR | STAT_BSY)) == STAT_CPR) {
|
|
|
|
int len = 0;
|
|
|
|
while (len < 16) {
|
|
|
|
int in;
|
|
|
|
in = inw(MFM_DATAIN);
|
|
|
|
result[len++] = in >> 8;
|
|
|
|
result[len++] = in;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (handler) {
|
|
|
|
handler();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
outw (CMD_RCAL, MFM_COMMAND); /* Clear interrupt condition */
|
|
|
|
printk ("mfm: unexpected interrupt - status = ");
|
|
|
|
print_status ();
|
|
|
|
while (1);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Tell the user about the drive if we decided it exists.
|
|
|
|
*/
|
|
|
|
static void mfm_geometry(int drive)
|
|
|
|
{
|
|
|
|
struct mfm_info *p = mfm_info + drive;
|
|
|
|
struct gendisk *disk = mfm_gendisk[drive];
|
|
|
|
disk->private_data = p;
|
|
|
|
if (p->cylinders)
|
|
|
|
printk ("%s: %dMB CHS=%d/%d/%d LCC=%d RECOMP=%d\n",
|
|
|
|
disk->disk_name,
|
|
|
|
p->cylinders * p->heads * p->sectors / 4096,
|
|
|
|
p->cylinders, p->heads, p->sectors,
|
|
|
|
p->lowcurrent, p->precomp);
|
|
|
|
set_capacity(disk, p->cylinders * p->heads * p->sectors / 2);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_BLK_DEV_MFM_AUTODETECT
|
|
|
|
/*
|
|
|
|
* Attempt to detect a drive and find its geometry. The drive has already been
|
|
|
|
* specified...
|
|
|
|
*
|
|
|
|
* We first recalibrate the disk, then try to probe sectors, heads and then
|
|
|
|
* cylinders. NOTE! the cylinder probe may break drives. The xd disk driver
|
|
|
|
* does something along these lines, so I assume that most drives are up to
|
|
|
|
* this mistreatment...
|
|
|
|
*/
|
|
|
|
static int mfm_detectdrive (int drive)
|
|
|
|
{
|
|
|
|
unsigned int mingeo[3], maxgeo[3];
|
|
|
|
unsigned int attribute, need_recal = 1;
|
|
|
|
unsigned char cmdb[8];
|
|
|
|
|
|
|
|
memset (mingeo, 0, sizeof (mingeo));
|
|
|
|
maxgeo[0] = mfm_info[drive].sectors;
|
|
|
|
maxgeo[1] = mfm_info[drive].heads;
|
|
|
|
maxgeo[2] = mfm_info[drive].cylinders;
|
|
|
|
|
|
|
|
cmdb[0] = drive + 1;
|
|
|
|
cmdb[6] = 0;
|
|
|
|
cmdb[7] = 1;
|
|
|
|
for (attribute = 0; attribute < 3; attribute++) {
|
|
|
|
while (mingeo[attribute] != maxgeo[attribute]) {
|
|
|
|
unsigned int variable;
|
|
|
|
|
|
|
|
variable = (maxgeo[attribute] + mingeo[attribute]) >> 1;
|
|
|
|
cmdb[1] = cmdb[2] = cmdb[3] = cmdb[4] = cmdb[5] = 0;
|
|
|
|
|
|
|
|
if (need_recal) {
|
|
|
|
int tries = 5;
|
|
|
|
|
|
|
|
do {
|
|
|
|
issue_command (CMD_RCLB, cmdb, 2);
|
|
|
|
wait_for_completion ();
|
|
|
|
wait_for_command_end ();
|
|
|
|
if (result[1] == 0x20)
|
|
|
|
break;
|
|
|
|
} while (result[1] && --tries);
|
|
|
|
if (result[1]) {
|
|
|
|
outw (CMD_RCAL, MFM_COMMAND);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
need_recal = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (attribute) {
|
|
|
|
case 0:
|
|
|
|
cmdb[5] = variable;
|
|
|
|
issue_command (CMD_CMPD, cmdb, 8);
|
|
|
|
break;
|
|
|
|
case 1:
|
|
|
|
cmdb[1] = variable;
|
|
|
|
cmdb[4] = variable;
|
|
|
|
issue_command (CMD_CMPD, cmdb, 8);
|
|
|
|
break;
|
|
|
|
case 2:
|
|
|
|
cmdb[2] = variable >> 8;
|
|
|
|
cmdb[3] = variable;
|
|
|
|
issue_command (CMD_SEK, cmdb, 4);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
wait_for_completion ();
|
|
|
|
wait_for_command_end ();
|
|
|
|
|
|
|
|
switch (result[1]) {
|
|
|
|
case 0x00:
|
|
|
|
case 0x50:
|
|
|
|
mingeo[attribute] = variable + 1;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 0x20:
|
|
|
|
outw (CMD_RCAL, MFM_COMMAND);
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
case 0x24:
|
|
|
|
need_recal = 1;
|
|
|
|
default:
|
|
|
|
maxgeo[attribute] = variable;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
mfm_info[drive].cylinders = mingeo[2];
|
|
|
|
mfm_info[drive].lowcurrent = mingeo[2];
|
|
|
|
mfm_info[drive].precomp = mingeo[2] / 2;
|
|
|
|
mfm_info[drive].heads = mingeo[1];
|
|
|
|
mfm_info[drive].sectors = mingeo[0];
|
|
|
|
outw (CMD_RCAL, MFM_COMMAND);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initialise all drive information for this controller.
|
|
|
|
*/
|
|
|
|
static int mfm_initdrives(void)
|
|
|
|
{
|
|
|
|
int drive;
|
|
|
|
|
|
|
|
if (number_mfm_drives > MFM_MAXDRIVES) {
|
|
|
|
number_mfm_drives = MFM_MAXDRIVES;
|
|
|
|
printk("No. of ADFS MFM drives is greater than MFM_MAXDRIVES - you can't have that many!\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
for (drive = 0; drive < number_mfm_drives; drive++) {
|
|
|
|
mfm_info[drive].lowcurrent = 1;
|
|
|
|
mfm_info[drive].precomp = 1;
|
|
|
|
mfm_info[drive].cylinder = -1;
|
|
|
|
mfm_info[drive].errors.recal = 0;
|
|
|
|
mfm_info[drive].errors.report = 0;
|
|
|
|
mfm_info[drive].errors.abort = 4;
|
|
|
|
|
|
|
|
#ifdef CONFIG_BLK_DEV_MFM_AUTODETECT
|
|
|
|
mfm_info[drive].cylinders = 1024;
|
|
|
|
mfm_info[drive].heads = 8;
|
|
|
|
mfm_info[drive].sectors = 64;
|
|
|
|
{
|
|
|
|
unsigned char cmdb[16];
|
|
|
|
|
|
|
|
mfm_setupspecify (drive, cmdb);
|
|
|
|
cmdb[1] &= ~0x81;
|
|
|
|
issue_command (CMD_SPC, cmdb, 16);
|
|
|
|
wait_for_completion ();
|
|
|
|
if (!mfm_detectdrive (drive)) {
|
|
|
|
mfm_info[drive].cylinders = 0;
|
|
|
|
mfm_info[drive].heads = 0;
|
|
|
|
mfm_info[drive].sectors = 0;
|
|
|
|
}
|
|
|
|
cmdb[0] = cmdb[1] = 0;
|
|
|
|
issue_command (CMD_CKV, cmdb, 2);
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
mfm_info[drive].cylinders = 1; /* its going to have to figure it out from the partition info */
|
|
|
|
mfm_info[drive].heads = 4;
|
|
|
|
mfm_info[drive].sectors = 32;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
return number_mfm_drives;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The 'front' end of the mfm driver follows...
|
|
|
|
*/
|
|
|
|
|
2006-01-08 02:02:50 -07:00
|
|
|
static int mfm_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2006-01-08 02:02:50 -07:00
|
|
|
struct mfm_info *p = bdev->bd_disk->private_data;
|
|
|
|
|
|
|
|
geo->heads = p->heads;
|
|
|
|
geo->sectors = p->sectors;
|
|
|
|
geo->cylinders = p->cylinders;
|
2005-04-16 16:20:36 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This is to handle various kernel command line parameters
|
|
|
|
* specific to this driver.
|
|
|
|
*/
|
|
|
|
void mfm_setup(char *str, int *ints)
|
|
|
|
{
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set the CHS from the ADFS boot block if it is present. This is not ideal
|
|
|
|
* since if there are any non-ADFS partitions on the disk, this won't work!
|
|
|
|
* Hence, I want to get rid of this...
|
|
|
|
*/
|
|
|
|
void xd_set_geometry(struct block_device *bdev, unsigned char secsptrack,
|
|
|
|
unsigned char heads, unsigned int secsize)
|
|
|
|
{
|
|
|
|
struct mfm_info *p = bdev->bd_disk->private_data;
|
|
|
|
int drive = p - mfm_info;
|
|
|
|
unsigned long disksize = bdev->bd_inode->i_size;
|
|
|
|
|
|
|
|
if (p->cylinders == 1) {
|
|
|
|
p->sectors = secsptrack;
|
|
|
|
p->heads = heads;
|
|
|
|
p->cylinders = discsize / (secsptrack * heads * secsize);
|
|
|
|
|
|
|
|
if ((heads < 1) || (p->cylinders > 1024)) {
|
|
|
|
printk("%s: Insane disc shape! Setting to 512/4/32\n",
|
|
|
|
bdev->bd_disk->disk_name);
|
|
|
|
|
|
|
|
/* These values are fairly arbitary, but are there so that if your
|
|
|
|
* lucky you can pick apart your disc to find out what is going on -
|
|
|
|
* I reckon these figures won't hurt MOST drives
|
|
|
|
*/
|
|
|
|
p->sectors = 32;
|
|
|
|
p->heads = 4;
|
|
|
|
p->cylinders = 512;
|
|
|
|
}
|
|
|
|
if (raw_cmd.dev == drive)
|
|
|
|
mfm_specify ();
|
|
|
|
mfm_geometry (drive);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct block_device_operations mfm_fops =
|
|
|
|
{
|
|
|
|
.owner = THIS_MODULE,
|
2006-01-08 02:02:50 -07:00
|
|
|
.getgeo = mfm_getgeo,
|
2005-04-16 16:20:36 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* See if there is a controller at the address presently at mfm_addr
|
|
|
|
*
|
|
|
|
* We check to see if the controller is busy - if it is, we abort it first,
|
|
|
|
* and check that the chip is no longer busy after at least 180 clock cycles.
|
|
|
|
* We then issue a command and check that the BSY or CPR bits are set.
|
|
|
|
*/
|
|
|
|
static int mfm_probecontroller (unsigned int mfm_addr)
|
|
|
|
{
|
|
|
|
if (inw (MFM_STATUS) & STAT_BSY) {
|
|
|
|
outw (CMD_ABT, MFM_COMMAND);
|
|
|
|
udelay (50);
|
|
|
|
if (inw (MFM_STATUS) & STAT_BSY)
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (inw (MFM_STATUS) & STAT_CED)
|
|
|
|
outw (CMD_RCAL, MFM_COMMAND);
|
|
|
|
|
|
|
|
outw (CMD_SEK, MFM_COMMAND);
|
|
|
|
|
|
|
|
if (inw (MFM_STATUS) & (STAT_BSY | STAT_CPR)) {
|
|
|
|
unsigned int count = 2000;
|
|
|
|
while (inw (MFM_STATUS) & STAT_BSY) {
|
|
|
|
udelay (500);
|
|
|
|
if (!--count)
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
outw (CMD_RCAL, MFM_COMMAND);
|
|
|
|
}
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mfm_do_init(unsigned char irqmask)
|
|
|
|
{
|
|
|
|
int i, ret;
|
|
|
|
|
|
|
|
printk("mfm: found at address %08X, interrupt %d\n", mfm_addr, mfm_irq);
|
|
|
|
|
|
|
|
ret = -EBUSY;
|
|
|
|
if (!request_region (mfm_addr, 10, "mfm"))
|
|
|
|
goto out1;
|
|
|
|
|
|
|
|
ret = register_blkdev(MAJOR_NR, "mfm");
|
|
|
|
if (ret)
|
|
|
|
goto out2;
|
|
|
|
|
|
|
|
/* Stuff for the assembler routines to get to */
|
|
|
|
hdc63463_baseaddress = ioaddr(mfm_addr);
|
|
|
|
hdc63463_irqpolladdress = mfm_IRQPollLoc;
|
|
|
|
hdc63463_irqpollmask = irqmask;
|
|
|
|
|
|
|
|
mfm_queue = blk_init_queue(do_mfm_request, &mfm_lock);
|
|
|
|
if (!mfm_queue)
|
|
|
|
goto out2a;
|
|
|
|
|
|
|
|
Busy = 0;
|
|
|
|
lastspecifieddrive = -1;
|
|
|
|
|
|
|
|
mfm_drives = mfm_initdrives();
|
|
|
|
if (!mfm_drives) {
|
|
|
|
ret = -ENODEV;
|
|
|
|
goto out3;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < mfm_drives; i++) {
|
|
|
|
struct gendisk *disk = alloc_disk(64);
|
|
|
|
if (!disk)
|
|
|
|
goto Enomem;
|
|
|
|
disk->major = MAJOR_NR;
|
|
|
|
disk->first_minor = i << 6;
|
|
|
|
disk->fops = &mfm_fops;
|
|
|
|
sprintf(disk->disk_name, "mfm%c", 'a'+i);
|
|
|
|
mfm_gendisk[i] = disk;
|
|
|
|
}
|
|
|
|
|
|
|
|
printk("mfm: detected %d hard drive%s\n", mfm_drives,
|
|
|
|
mfm_drives == 1 ? "" : "s");
|
|
|
|
ret = request_irq(mfm_irq, mfm_interrupt_handler, SA_INTERRUPT, "MFM harddisk", NULL);
|
|
|
|
if (ret) {
|
|
|
|
printk("mfm: unable to get IRQ%d\n", mfm_irq);
|
|
|
|
goto out4;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (mfm_irqenable)
|
|
|
|
outw(0x80, mfm_irqenable); /* Required to enable IRQs from MFM podule */
|
|
|
|
|
|
|
|
for (i = 0; i < mfm_drives; i++) {
|
|
|
|
mfm_geometry(i);
|
|
|
|
mfm_gendisk[i]->queue = mfm_queue;
|
|
|
|
add_disk(mfm_gendisk[i]);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
out4:
|
|
|
|
for (i = 0; i < mfm_drives; i++)
|
|
|
|
put_disk(mfm_gendisk[i]);
|
|
|
|
out3:
|
|
|
|
blk_cleanup_queue(mfm_queue);
|
|
|
|
out2a:
|
|
|
|
unregister_blkdev(MAJOR_NR, "mfm");
|
|
|
|
out2:
|
|
|
|
release_region(mfm_addr, 10);
|
|
|
|
out1:
|
|
|
|
return ret;
|
|
|
|
Enomem:
|
|
|
|
while (i--)
|
|
|
|
put_disk(mfm_gendisk[i]);
|
|
|
|
goto out3;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mfm_do_exit(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
free_irq(mfm_irq, NULL);
|
|
|
|
for (i = 0; i < mfm_drives; i++) {
|
|
|
|
del_gendisk(mfm_gendisk[i]);
|
|
|
|
put_disk(mfm_gendisk[i]);
|
|
|
|
}
|
|
|
|
blk_cleanup_queue(mfm_queue);
|
|
|
|
unregister_blkdev(MAJOR_NR, "mfm");
|
|
|
|
if (mfm_addr)
|
|
|
|
release_region(mfm_addr, 10);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __devinit mfm_probe(struct expansion_card *ec, struct ecard_id *id)
|
|
|
|
{
|
|
|
|
if (mfm_addr)
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
mfm_addr = ecard_address(ec, ECARD_IOC, ECARD_MEDIUM) + 0x800;
|
|
|
|
mfm_IRQPollLoc = ioaddr(mfm_addr + 0x400);
|
|
|
|
mfm_irqenable = mfm_IRQPollLoc;
|
|
|
|
mfm_irq = ec->irq;
|
|
|
|
|
|
|
|
return mfm_do_init(0x08);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __devexit mfm_remove(struct expansion_card *ec)
|
|
|
|
{
|
|
|
|
outw (0, mfm_irqenable); /* Required to enable IRQs from MFM podule */
|
|
|
|
mfm_do_exit();
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct ecard_id mfm_cids[] = {
|
|
|
|
{ MANU_ACORN, PROD_ACORN_MFM },
|
|
|
|
{ 0xffff, 0xffff },
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct ecard_driver mfm_driver = {
|
|
|
|
.probe = mfm_probe,
|
|
|
|
.remove = __devexit(mfm_remove),
|
|
|
|
.id_table = mfm_cids,
|
|
|
|
.drv = {
|
|
|
|
.name = "mfm",
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Look for a MFM controller - first check the motherboard, then the podules
|
|
|
|
* The podules have an extra interrupt enable that needs to be played with
|
|
|
|
*
|
|
|
|
* The HDC is accessed at MEDIUM IOC speeds.
|
|
|
|
*/
|
|
|
|
static int __init mfm_init (void)
|
|
|
|
{
|
|
|
|
unsigned char irqmask;
|
|
|
|
|
|
|
|
if (mfm_probecontroller(ONBOARD_MFM_ADDRESS)) {
|
|
|
|
mfm_addr = ONBOARD_MFM_ADDRESS;
|
|
|
|
mfm_IRQPollLoc = IOC_IRQSTATB;
|
|
|
|
mfm_irqenable = 0;
|
|
|
|
mfm_irq = IRQ_HARDDISK;
|
|
|
|
return mfm_do_init(0x08); /* IL3 pin */
|
|
|
|
} else {
|
|
|
|
return ecard_register_driver(&mfm_driver);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit mfm_exit(void)
|
|
|
|
{
|
|
|
|
if (mfm_addr == ONBOARD_MFM_ADDRESS)
|
|
|
|
mfm_do_exit();
|
|
|
|
else
|
|
|
|
ecard_unregister_driver(&mfm_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(mfm_init)
|
|
|
|
module_exit(mfm_exit)
|
|
|
|
MODULE_LICENSE("GPL");
|