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1288 lines
32 KiB
1288 lines
32 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Driver for the SWIM3 (Super Woz Integrated Machine 3) |
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* floppy controller found on Power Macintoshes. |
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* |
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* Copyright (C) 1996 Paul Mackerras. |
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*/ |
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|
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/* |
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* TODO: |
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* handle 2 drives |
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* handle GCR disks |
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*/ |
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|
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#undef DEBUG |
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|
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#include <linux/stddef.h> |
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#include <linux/kernel.h> |
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#include <linux/sched/signal.h> |
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#include <linux/timer.h> |
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#include <linux/delay.h> |
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#include <linux/fd.h> |
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#include <linux/ioctl.h> |
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#include <linux/blk-mq.h> |
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#include <linux/interrupt.h> |
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#include <linux/mutex.h> |
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#include <linux/module.h> |
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#include <linux/spinlock.h> |
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#include <linux/wait.h> |
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#include <asm/io.h> |
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#include <asm/dbdma.h> |
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#include <asm/prom.h> |
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#include <linux/uaccess.h> |
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#include <asm/mediabay.h> |
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#include <asm/machdep.h> |
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#include <asm/pmac_feature.h> |
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|
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#define MAX_FLOPPIES 2 |
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|
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static DEFINE_MUTEX(swim3_mutex); |
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static struct gendisk *disks[MAX_FLOPPIES]; |
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|
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enum swim_state { |
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idle, |
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locating, |
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seeking, |
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settling, |
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do_transfer, |
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jogging, |
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available, |
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revalidating, |
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ejecting |
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}; |
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|
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#define REG(x) unsigned char x; char x ## _pad[15]; |
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|
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/* |
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* The names for these registers mostly represent speculation on my part. |
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* It will be interesting to see how close they are to the names Apple uses. |
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*/ |
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struct swim3 { |
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REG(data); |
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REG(timer); /* counts down at 1MHz */ |
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REG(error); |
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REG(mode); |
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REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */ |
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REG(setup); |
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REG(control); /* writing bits clears them */ |
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REG(status); /* writing bits sets them in control */ |
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REG(intr); |
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REG(nseek); /* # tracks to seek */ |
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REG(ctrack); /* current track number */ |
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REG(csect); /* current sector number */ |
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REG(gap3); /* size of gap 3 in track format */ |
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REG(sector); /* sector # to read or write */ |
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REG(nsect); /* # sectors to read or write */ |
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REG(intr_enable); |
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}; |
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|
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#define control_bic control |
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#define control_bis status |
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|
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/* Bits in select register */ |
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#define CA_MASK 7 |
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#define LSTRB 8 |
|
|
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/* Bits in control register */ |
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#define DO_SEEK 0x80 |
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#define FORMAT 0x40 |
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#define SELECT 0x20 |
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#define WRITE_SECTORS 0x10 |
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#define DO_ACTION 0x08 |
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#define DRIVE2_ENABLE 0x04 |
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#define DRIVE_ENABLE 0x02 |
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#define INTR_ENABLE 0x01 |
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|
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/* Bits in status register */ |
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#define FIFO_1BYTE 0x80 |
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#define FIFO_2BYTE 0x40 |
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#define ERROR 0x20 |
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#define DATA 0x08 |
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#define RDDATA 0x04 |
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#define INTR_PENDING 0x02 |
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#define MARK_BYTE 0x01 |
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|
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/* Bits in intr and intr_enable registers */ |
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#define ERROR_INTR 0x20 |
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#define DATA_CHANGED 0x10 |
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#define TRANSFER_DONE 0x08 |
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#define SEEN_SECTOR 0x04 |
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#define SEEK_DONE 0x02 |
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#define TIMER_DONE 0x01 |
|
|
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/* Bits in error register */ |
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#define ERR_DATA_CRC 0x80 |
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#define ERR_ADDR_CRC 0x40 |
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#define ERR_OVERRUN 0x04 |
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#define ERR_UNDERRUN 0x01 |
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|
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/* Bits in setup register */ |
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#define S_SW_RESET 0x80 |
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#define S_GCR_WRITE 0x40 |
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#define S_IBM_DRIVE 0x20 |
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#define S_TEST_MODE 0x10 |
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#define S_FCLK_DIV2 0x08 |
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#define S_GCR 0x04 |
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#define S_COPY_PROT 0x02 |
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#define S_INV_WDATA 0x01 |
|
|
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/* Select values for swim3_action */ |
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#define SEEK_POSITIVE 0 |
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#define SEEK_NEGATIVE 4 |
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#define STEP 1 |
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#define MOTOR_ON 2 |
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#define MOTOR_OFF 6 |
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#define INDEX 3 |
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#define EJECT 7 |
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#define SETMFM 9 |
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#define SETGCR 13 |
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|
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/* Select values for swim3_select and swim3_readbit */ |
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#define STEP_DIR 0 |
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#define STEPPING 1 |
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#define MOTOR_ON 2 |
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#define RELAX 3 /* also eject in progress */ |
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#define READ_DATA_0 4 |
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#define ONEMEG_DRIVE 5 |
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#define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */ |
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#define DRIVE_PRESENT 7 |
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#define DISK_IN 8 |
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#define WRITE_PROT 9 |
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#define TRACK_ZERO 10 |
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#define TACHO 11 |
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#define READ_DATA_1 12 |
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#define GCR_MODE 13 |
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#define SEEK_COMPLETE 14 |
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#define TWOMEG_MEDIA 15 |
|
|
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/* Definitions of values used in writing and formatting */ |
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#define DATA_ESCAPE 0x99 |
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#define GCR_SYNC_EXC 0x3f |
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#define GCR_SYNC_CONV 0x80 |
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#define GCR_FIRST_MARK 0xd5 |
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#define GCR_SECOND_MARK 0xaa |
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#define GCR_ADDR_MARK "\xd5\xaa\x00" |
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#define GCR_DATA_MARK "\xd5\xaa\x0b" |
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#define GCR_SLIP_BYTE "\x27\xaa" |
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#define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f" |
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|
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#define DATA_99 "\x99\x99" |
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#define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe" |
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#define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc" |
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#define MFM_GAP_LEN 12 |
|
|
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struct floppy_state { |
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enum swim_state state; |
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struct swim3 __iomem *swim3; /* hardware registers */ |
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struct dbdma_regs __iomem *dma; /* DMA controller registers */ |
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int swim3_intr; /* interrupt number for SWIM3 */ |
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int dma_intr; /* interrupt number for DMA channel */ |
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int cur_cyl; /* cylinder head is on, or -1 */ |
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int cur_sector; /* last sector we saw go past */ |
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int req_cyl; /* the cylinder for the current r/w request */ |
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int head; /* head number ditto */ |
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int req_sector; /* sector number ditto */ |
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int scount; /* # sectors we're transferring at present */ |
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int retries; |
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int settle_time; |
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int secpercyl; /* disk geometry information */ |
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int secpertrack; |
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int total_secs; |
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int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */ |
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struct dbdma_cmd *dma_cmd; |
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int ref_count; |
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int expect_cyl; |
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struct timer_list timeout; |
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int timeout_pending; |
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int ejected; |
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wait_queue_head_t wait; |
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int wanted; |
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struct macio_dev *mdev; |
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char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)]; |
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int index; |
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struct request *cur_req; |
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struct blk_mq_tag_set tag_set; |
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}; |
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|
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#define swim3_err(fmt, arg...) dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) |
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#define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) |
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#define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) |
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|
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#ifdef DEBUG |
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#define swim3_dbg(fmt, arg...) dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg) |
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#else |
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#define swim3_dbg(fmt, arg...) do { } while(0) |
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#endif |
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|
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static struct floppy_state floppy_states[MAX_FLOPPIES]; |
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static int floppy_count = 0; |
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static DEFINE_SPINLOCK(swim3_lock); |
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|
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static unsigned short write_preamble[] = { |
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0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */ |
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0, 0, 0, 0, 0, 0, /* sync field */ |
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0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */ |
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0x990f /* no escape for 512 bytes */ |
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}; |
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|
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static unsigned short write_postamble[] = { |
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0x9904, /* insert CRC */ |
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0x4e4e, 0x4e4e, |
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0x9908, /* stop writing */ |
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0, 0, 0, 0, 0, 0 |
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}; |
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|
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static void seek_track(struct floppy_state *fs, int n); |
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static void act(struct floppy_state *fs); |
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static void scan_timeout(struct timer_list *t); |
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static void seek_timeout(struct timer_list *t); |
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static void settle_timeout(struct timer_list *t); |
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static void xfer_timeout(struct timer_list *t); |
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static irqreturn_t swim3_interrupt(int irq, void *dev_id); |
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/*static void fd_dma_interrupt(int irq, void *dev_id);*/ |
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static int grab_drive(struct floppy_state *fs, enum swim_state state, |
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int interruptible); |
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static void release_drive(struct floppy_state *fs); |
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static int fd_eject(struct floppy_state *fs); |
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static int floppy_ioctl(struct block_device *bdev, fmode_t mode, |
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unsigned int cmd, unsigned long param); |
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static int floppy_open(struct block_device *bdev, fmode_t mode); |
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static void floppy_release(struct gendisk *disk, fmode_t mode); |
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static unsigned int floppy_check_events(struct gendisk *disk, |
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unsigned int clearing); |
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static int floppy_revalidate(struct gendisk *disk); |
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|
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static bool swim3_end_request(struct floppy_state *fs, blk_status_t err, unsigned int nr_bytes) |
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{ |
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struct request *req = fs->cur_req; |
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|
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swim3_dbg(" end request, err=%d nr_bytes=%d, cur_req=%p\n", |
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err, nr_bytes, req); |
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|
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if (err) |
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nr_bytes = blk_rq_cur_bytes(req); |
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if (blk_update_request(req, err, nr_bytes)) |
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return true; |
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__blk_mq_end_request(req, err); |
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fs->cur_req = NULL; |
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return false; |
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} |
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|
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static void swim3_select(struct floppy_state *fs, int sel) |
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{ |
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struct swim3 __iomem *sw = fs->swim3; |
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|
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out_8(&sw->select, RELAX); |
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if (sel & 8) |
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out_8(&sw->control_bis, SELECT); |
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else |
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out_8(&sw->control_bic, SELECT); |
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out_8(&sw->select, sel & CA_MASK); |
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} |
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static void swim3_action(struct floppy_state *fs, int action) |
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{ |
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struct swim3 __iomem *sw = fs->swim3; |
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|
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swim3_select(fs, action); |
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udelay(1); |
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out_8(&sw->select, sw->select | LSTRB); |
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udelay(2); |
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out_8(&sw->select, sw->select & ~LSTRB); |
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udelay(1); |
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} |
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static int swim3_readbit(struct floppy_state *fs, int bit) |
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{ |
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struct swim3 __iomem *sw = fs->swim3; |
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int stat; |
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|
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swim3_select(fs, bit); |
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udelay(1); |
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stat = in_8(&sw->status); |
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return (stat & DATA) == 0; |
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} |
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|
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static blk_status_t swim3_queue_rq(struct blk_mq_hw_ctx *hctx, |
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const struct blk_mq_queue_data *bd) |
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{ |
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struct floppy_state *fs = hctx->queue->queuedata; |
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struct request *req = bd->rq; |
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unsigned long x; |
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|
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spin_lock_irq(&swim3_lock); |
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if (fs->cur_req || fs->state != idle) { |
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spin_unlock_irq(&swim3_lock); |
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return BLK_STS_DEV_RESOURCE; |
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} |
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blk_mq_start_request(req); |
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fs->cur_req = req; |
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if (fs->mdev->media_bay && |
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check_media_bay(fs->mdev->media_bay) != MB_FD) { |
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swim3_dbg("%s", " media bay absent, dropping req\n"); |
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swim3_end_request(fs, BLK_STS_IOERR, 0); |
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goto out; |
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} |
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if (fs->ejected) { |
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swim3_dbg("%s", " disk ejected\n"); |
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swim3_end_request(fs, BLK_STS_IOERR, 0); |
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goto out; |
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} |
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if (rq_data_dir(req) == WRITE) { |
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if (fs->write_prot < 0) |
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fs->write_prot = swim3_readbit(fs, WRITE_PROT); |
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if (fs->write_prot) { |
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swim3_dbg("%s", " try to write, disk write protected\n"); |
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swim3_end_request(fs, BLK_STS_IOERR, 0); |
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goto out; |
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} |
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} |
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|
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/* |
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* Do not remove the cast. blk_rq_pos(req) is now a sector_t and can be |
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* 64 bits, but it will never go past 32 bits for this driver anyway, so |
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* we can safely cast it down and not have to do a 64/32 division |
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*/ |
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fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl; |
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x = ((long)blk_rq_pos(req)) % fs->secpercyl; |
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fs->head = x / fs->secpertrack; |
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fs->req_sector = x % fs->secpertrack + 1; |
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fs->state = do_transfer; |
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fs->retries = 0; |
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|
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act(fs); |
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|
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out: |
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spin_unlock_irq(&swim3_lock); |
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return BLK_STS_OK; |
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} |
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|
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static void set_timeout(struct floppy_state *fs, int nticks, |
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void (*proc)(struct timer_list *t)) |
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{ |
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if (fs->timeout_pending) |
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del_timer(&fs->timeout); |
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fs->timeout.expires = jiffies + nticks; |
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fs->timeout.function = proc; |
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add_timer(&fs->timeout); |
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fs->timeout_pending = 1; |
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} |
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|
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static inline void scan_track(struct floppy_state *fs) |
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{ |
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struct swim3 __iomem *sw = fs->swim3; |
|
|
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swim3_select(fs, READ_DATA_0); |
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in_8(&sw->intr); /* clear SEEN_SECTOR bit */ |
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in_8(&sw->error); |
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out_8(&sw->intr_enable, SEEN_SECTOR); |
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out_8(&sw->control_bis, DO_ACTION); |
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/* enable intr when track found */ |
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set_timeout(fs, HZ, scan_timeout); /* enable timeout */ |
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} |
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|
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static inline void seek_track(struct floppy_state *fs, int n) |
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{ |
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struct swim3 __iomem *sw = fs->swim3; |
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|
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if (n >= 0) { |
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swim3_action(fs, SEEK_POSITIVE); |
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sw->nseek = n; |
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} else { |
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swim3_action(fs, SEEK_NEGATIVE); |
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sw->nseek = -n; |
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} |
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fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1; |
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swim3_select(fs, STEP); |
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in_8(&sw->error); |
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/* enable intr when seek finished */ |
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out_8(&sw->intr_enable, SEEK_DONE); |
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out_8(&sw->control_bis, DO_SEEK); |
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set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */ |
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fs->settle_time = 0; |
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} |
|
|
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/* |
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* XXX: this is a horrible hack, but at least allows ppc32 to get |
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* out of defining virt_to_bus, and this driver out of using the |
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* deprecated block layer bounce buffering for highmem addresses |
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* for no good reason. |
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*/ |
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static unsigned long swim3_phys_to_bus(phys_addr_t paddr) |
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{ |
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return paddr + PCI_DRAM_OFFSET; |
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} |
|
|
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static phys_addr_t swim3_bio_phys(struct bio *bio) |
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{ |
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return page_to_phys(bio_page(bio)) + bio_offset(bio); |
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} |
|
|
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static inline void init_dma(struct dbdma_cmd *cp, int cmd, |
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phys_addr_t paddr, int count) |
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{ |
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cp->req_count = cpu_to_le16(count); |
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cp->command = cpu_to_le16(cmd); |
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cp->phy_addr = cpu_to_le32(swim3_phys_to_bus(paddr)); |
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cp->xfer_status = 0; |
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} |
|
|
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static inline void setup_transfer(struct floppy_state *fs) |
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{ |
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int n; |
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struct swim3 __iomem *sw = fs->swim3; |
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struct dbdma_cmd *cp = fs->dma_cmd; |
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struct dbdma_regs __iomem *dr = fs->dma; |
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struct request *req = fs->cur_req; |
|
|
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if (blk_rq_cur_sectors(req) <= 0) { |
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swim3_warn("%s", "Transfer 0 sectors ?\n"); |
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return; |
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} |
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if (rq_data_dir(req) == WRITE) |
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n = 1; |
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else { |
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n = fs->secpertrack - fs->req_sector + 1; |
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if (n > blk_rq_cur_sectors(req)) |
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n = blk_rq_cur_sectors(req); |
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} |
|
|
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swim3_dbg(" setup xfer at sect %d (of %d) head %d for %d\n", |
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fs->req_sector, fs->secpertrack, fs->head, n); |
|
|
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fs->scount = n; |
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swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0); |
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out_8(&sw->sector, fs->req_sector); |
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out_8(&sw->nsect, n); |
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out_8(&sw->gap3, 0); |
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out_le32(&dr->cmdptr, swim3_phys_to_bus(virt_to_phys(cp))); |
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if (rq_data_dir(req) == WRITE) { |
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/* Set up 3 dma commands: write preamble, data, postamble */ |
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init_dma(cp, OUTPUT_MORE, virt_to_phys(write_preamble), |
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sizeof(write_preamble)); |
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++cp; |
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init_dma(cp, OUTPUT_MORE, swim3_bio_phys(req->bio), 512); |
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++cp; |
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init_dma(cp, OUTPUT_LAST, virt_to_phys(write_postamble), |
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sizeof(write_postamble)); |
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} else { |
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init_dma(cp, INPUT_LAST, swim3_bio_phys(req->bio), n * 512); |
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} |
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++cp; |
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out_le16(&cp->command, DBDMA_STOP); |
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out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); |
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in_8(&sw->error); |
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out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); |
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if (rq_data_dir(req) == WRITE) |
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out_8(&sw->control_bis, WRITE_SECTORS); |
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in_8(&sw->intr); |
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out_le32(&dr->control, (RUN << 16) | RUN); |
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/* enable intr when transfer complete */ |
|
out_8(&sw->intr_enable, TRANSFER_DONE); |
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out_8(&sw->control_bis, DO_ACTION); |
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set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */ |
|
} |
|
|
|
static void act(struct floppy_state *fs) |
|
{ |
|
for (;;) { |
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swim3_dbg(" act loop, state=%d, req_cyl=%d, cur_cyl=%d\n", |
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fs->state, fs->req_cyl, fs->cur_cyl); |
|
|
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switch (fs->state) { |
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case idle: |
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return; /* XXX shouldn't get here */ |
|
|
|
case locating: |
|
if (swim3_readbit(fs, TRACK_ZERO)) { |
|
swim3_dbg("%s", " locate track 0\n"); |
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fs->cur_cyl = 0; |
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if (fs->req_cyl == 0) |
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fs->state = do_transfer; |
|
else |
|
fs->state = seeking; |
|
break; |
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} |
|
scan_track(fs); |
|
return; |
|
|
|
case seeking: |
|
if (fs->cur_cyl < 0) { |
|
fs->expect_cyl = -1; |
|
fs->state = locating; |
|
break; |
|
} |
|
if (fs->req_cyl == fs->cur_cyl) { |
|
swim3_warn("%s", "Whoops, seeking 0\n"); |
|
fs->state = do_transfer; |
|
break; |
|
} |
|
seek_track(fs, fs->req_cyl - fs->cur_cyl); |
|
return; |
|
|
|
case settling: |
|
/* check for SEEK_COMPLETE after 30ms */ |
|
fs->settle_time = (HZ + 32) / 33; |
|
set_timeout(fs, fs->settle_time, settle_timeout); |
|
return; |
|
|
|
case do_transfer: |
|
if (fs->cur_cyl != fs->req_cyl) { |
|
if (fs->retries > 5) { |
|
swim3_err("Wrong cylinder in transfer, want: %d got %d\n", |
|
fs->req_cyl, fs->cur_cyl); |
|
swim3_end_request(fs, BLK_STS_IOERR, 0); |
|
fs->state = idle; |
|
return; |
|
} |
|
fs->state = seeking; |
|
break; |
|
} |
|
setup_transfer(fs); |
|
return; |
|
|
|
case jogging: |
|
seek_track(fs, -5); |
|
return; |
|
|
|
default: |
|
swim3_err("Unknown state %d\n", fs->state); |
|
return; |
|
} |
|
} |
|
} |
|
|
|
static void scan_timeout(struct timer_list *t) |
|
{ |
|
struct floppy_state *fs = from_timer(fs, t, timeout); |
|
struct swim3 __iomem *sw = fs->swim3; |
|
unsigned long flags; |
|
|
|
swim3_dbg("* scan timeout, state=%d\n", fs->state); |
|
|
|
spin_lock_irqsave(&swim3_lock, flags); |
|
fs->timeout_pending = 0; |
|
out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); |
|
out_8(&sw->select, RELAX); |
|
out_8(&sw->intr_enable, 0); |
|
fs->cur_cyl = -1; |
|
if (fs->retries > 5) { |
|
swim3_end_request(fs, BLK_STS_IOERR, 0); |
|
fs->state = idle; |
|
} else { |
|
fs->state = jogging; |
|
act(fs); |
|
} |
|
spin_unlock_irqrestore(&swim3_lock, flags); |
|
} |
|
|
|
static void seek_timeout(struct timer_list *t) |
|
{ |
|
struct floppy_state *fs = from_timer(fs, t, timeout); |
|
struct swim3 __iomem *sw = fs->swim3; |
|
unsigned long flags; |
|
|
|
swim3_dbg("* seek timeout, state=%d\n", fs->state); |
|
|
|
spin_lock_irqsave(&swim3_lock, flags); |
|
fs->timeout_pending = 0; |
|
out_8(&sw->control_bic, DO_SEEK); |
|
out_8(&sw->select, RELAX); |
|
out_8(&sw->intr_enable, 0); |
|
swim3_err("%s", "Seek timeout\n"); |
|
swim3_end_request(fs, BLK_STS_IOERR, 0); |
|
fs->state = idle; |
|
spin_unlock_irqrestore(&swim3_lock, flags); |
|
} |
|
|
|
static void settle_timeout(struct timer_list *t) |
|
{ |
|
struct floppy_state *fs = from_timer(fs, t, timeout); |
|
struct swim3 __iomem *sw = fs->swim3; |
|
unsigned long flags; |
|
|
|
swim3_dbg("* settle timeout, state=%d\n", fs->state); |
|
|
|
spin_lock_irqsave(&swim3_lock, flags); |
|
fs->timeout_pending = 0; |
|
if (swim3_readbit(fs, SEEK_COMPLETE)) { |
|
out_8(&sw->select, RELAX); |
|
fs->state = locating; |
|
act(fs); |
|
goto unlock; |
|
} |
|
out_8(&sw->select, RELAX); |
|
if (fs->settle_time < 2*HZ) { |
|
++fs->settle_time; |
|
set_timeout(fs, 1, settle_timeout); |
|
goto unlock; |
|
} |
|
swim3_err("%s", "Seek settle timeout\n"); |
|
swim3_end_request(fs, BLK_STS_IOERR, 0); |
|
fs->state = idle; |
|
unlock: |
|
spin_unlock_irqrestore(&swim3_lock, flags); |
|
} |
|
|
|
static void xfer_timeout(struct timer_list *t) |
|
{ |
|
struct floppy_state *fs = from_timer(fs, t, timeout); |
|
struct swim3 __iomem *sw = fs->swim3; |
|
struct dbdma_regs __iomem *dr = fs->dma; |
|
unsigned long flags; |
|
int n; |
|
|
|
swim3_dbg("* xfer timeout, state=%d\n", fs->state); |
|
|
|
spin_lock_irqsave(&swim3_lock, flags); |
|
fs->timeout_pending = 0; |
|
out_le32(&dr->control, RUN << 16); |
|
/* We must wait a bit for dbdma to stop */ |
|
for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++) |
|
udelay(1); |
|
out_8(&sw->intr_enable, 0); |
|
out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); |
|
out_8(&sw->select, RELAX); |
|
swim3_err("Timeout %sing sector %ld\n", |
|
(rq_data_dir(fs->cur_req)==WRITE? "writ": "read"), |
|
(long)blk_rq_pos(fs->cur_req)); |
|
swim3_end_request(fs, BLK_STS_IOERR, 0); |
|
fs->state = idle; |
|
spin_unlock_irqrestore(&swim3_lock, flags); |
|
} |
|
|
|
static irqreturn_t swim3_interrupt(int irq, void *dev_id) |
|
{ |
|
struct floppy_state *fs = (struct floppy_state *) dev_id; |
|
struct swim3 __iomem *sw = fs->swim3; |
|
int intr, err, n; |
|
int stat, resid; |
|
struct dbdma_regs __iomem *dr; |
|
struct dbdma_cmd *cp; |
|
unsigned long flags; |
|
struct request *req = fs->cur_req; |
|
|
|
swim3_dbg("* interrupt, state=%d\n", fs->state); |
|
|
|
spin_lock_irqsave(&swim3_lock, flags); |
|
intr = in_8(&sw->intr); |
|
err = (intr & ERROR_INTR)? in_8(&sw->error): 0; |
|
if ((intr & ERROR_INTR) && fs->state != do_transfer) |
|
swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n", |
|
fs->state, rq_data_dir(req), intr, err); |
|
switch (fs->state) { |
|
case locating: |
|
if (intr & SEEN_SECTOR) { |
|
out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS); |
|
out_8(&sw->select, RELAX); |
|
out_8(&sw->intr_enable, 0); |
|
del_timer(&fs->timeout); |
|
fs->timeout_pending = 0; |
|
if (sw->ctrack == 0xff) { |
|
swim3_err("%s", "Seen sector but cyl=ff?\n"); |
|
fs->cur_cyl = -1; |
|
if (fs->retries > 5) { |
|
swim3_end_request(fs, BLK_STS_IOERR, 0); |
|
fs->state = idle; |
|
} else { |
|
fs->state = jogging; |
|
act(fs); |
|
} |
|
break; |
|
} |
|
fs->cur_cyl = sw->ctrack; |
|
fs->cur_sector = sw->csect; |
|
if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl) |
|
swim3_err("Expected cyl %d, got %d\n", |
|
fs->expect_cyl, fs->cur_cyl); |
|
fs->state = do_transfer; |
|
act(fs); |
|
} |
|
break; |
|
case seeking: |
|
case jogging: |
|
if (sw->nseek == 0) { |
|
out_8(&sw->control_bic, DO_SEEK); |
|
out_8(&sw->select, RELAX); |
|
out_8(&sw->intr_enable, 0); |
|
del_timer(&fs->timeout); |
|
fs->timeout_pending = 0; |
|
if (fs->state == seeking) |
|
++fs->retries; |
|
fs->state = settling; |
|
act(fs); |
|
} |
|
break; |
|
case settling: |
|
out_8(&sw->intr_enable, 0); |
|
del_timer(&fs->timeout); |
|
fs->timeout_pending = 0; |
|
act(fs); |
|
break; |
|
case do_transfer: |
|
if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0) |
|
break; |
|
out_8(&sw->intr_enable, 0); |
|
out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION); |
|
out_8(&sw->select, RELAX); |
|
del_timer(&fs->timeout); |
|
fs->timeout_pending = 0; |
|
dr = fs->dma; |
|
cp = fs->dma_cmd; |
|
if (rq_data_dir(req) == WRITE) |
|
++cp; |
|
/* |
|
* Check that the main data transfer has finished. |
|
* On writing, the swim3 sometimes doesn't use |
|
* up all the bytes of the postamble, so we can still |
|
* see DMA active here. That doesn't matter as long |
|
* as all the sector data has been transferred. |
|
*/ |
|
if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) { |
|
/* wait a little while for DMA to complete */ |
|
for (n = 0; n < 100; ++n) { |
|
if (cp->xfer_status != 0) |
|
break; |
|
udelay(1); |
|
barrier(); |
|
} |
|
} |
|
/* turn off DMA */ |
|
out_le32(&dr->control, (RUN | PAUSE) << 16); |
|
stat = le16_to_cpu(cp->xfer_status); |
|
resid = le16_to_cpu(cp->res_count); |
|
if (intr & ERROR_INTR) { |
|
n = fs->scount - 1 - resid / 512; |
|
if (n > 0) { |
|
blk_update_request(req, 0, n << 9); |
|
fs->req_sector += n; |
|
} |
|
if (fs->retries < 5) { |
|
++fs->retries; |
|
act(fs); |
|
} else { |
|
swim3_err("Error %sing block %ld (err=%x)\n", |
|
rq_data_dir(req) == WRITE? "writ": "read", |
|
(long)blk_rq_pos(req), err); |
|
swim3_end_request(fs, BLK_STS_IOERR, 0); |
|
fs->state = idle; |
|
} |
|
} else { |
|
if ((stat & ACTIVE) == 0 || resid != 0) { |
|
/* musta been an error */ |
|
swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid); |
|
swim3_err(" state=%d, dir=%x, intr=%x, err=%x\n", |
|
fs->state, rq_data_dir(req), intr, err); |
|
swim3_end_request(fs, BLK_STS_IOERR, 0); |
|
fs->state = idle; |
|
break; |
|
} |
|
fs->retries = 0; |
|
if (swim3_end_request(fs, 0, fs->scount << 9)) { |
|
fs->req_sector += fs->scount; |
|
if (fs->req_sector > fs->secpertrack) { |
|
fs->req_sector -= fs->secpertrack; |
|
if (++fs->head > 1) { |
|
fs->head = 0; |
|
++fs->req_cyl; |
|
} |
|
} |
|
act(fs); |
|
} else |
|
fs->state = idle; |
|
} |
|
break; |
|
default: |
|
swim3_err("Don't know what to do in state %d\n", fs->state); |
|
} |
|
spin_unlock_irqrestore(&swim3_lock, flags); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
/* |
|
static void fd_dma_interrupt(int irq, void *dev_id) |
|
{ |
|
} |
|
*/ |
|
|
|
/* Called under the mutex to grab exclusive access to a drive */ |
|
static int grab_drive(struct floppy_state *fs, enum swim_state state, |
|
int interruptible) |
|
{ |
|
unsigned long flags; |
|
|
|
swim3_dbg("%s", "-> grab drive\n"); |
|
|
|
spin_lock_irqsave(&swim3_lock, flags); |
|
if (fs->state != idle && fs->state != available) { |
|
++fs->wanted; |
|
/* this will enable irqs in order to sleep */ |
|
if (!interruptible) |
|
wait_event_lock_irq(fs->wait, |
|
fs->state == available, |
|
swim3_lock); |
|
else if (wait_event_interruptible_lock_irq(fs->wait, |
|
fs->state == available, |
|
swim3_lock)) { |
|
--fs->wanted; |
|
spin_unlock_irqrestore(&swim3_lock, flags); |
|
return -EINTR; |
|
} |
|
--fs->wanted; |
|
} |
|
fs->state = state; |
|
spin_unlock_irqrestore(&swim3_lock, flags); |
|
|
|
return 0; |
|
} |
|
|
|
static void release_drive(struct floppy_state *fs) |
|
{ |
|
struct request_queue *q = disks[fs->index]->queue; |
|
unsigned long flags; |
|
|
|
swim3_dbg("%s", "-> release drive\n"); |
|
|
|
spin_lock_irqsave(&swim3_lock, flags); |
|
fs->state = idle; |
|
spin_unlock_irqrestore(&swim3_lock, flags); |
|
|
|
blk_mq_freeze_queue(q); |
|
blk_mq_quiesce_queue(q); |
|
blk_mq_unquiesce_queue(q); |
|
blk_mq_unfreeze_queue(q); |
|
} |
|
|
|
static int fd_eject(struct floppy_state *fs) |
|
{ |
|
int err, n; |
|
|
|
err = grab_drive(fs, ejecting, 1); |
|
if (err) |
|
return err; |
|
swim3_action(fs, EJECT); |
|
for (n = 20; n > 0; --n) { |
|
if (signal_pending(current)) { |
|
err = -EINTR; |
|
break; |
|
} |
|
swim3_select(fs, RELAX); |
|
schedule_timeout_interruptible(1); |
|
if (swim3_readbit(fs, DISK_IN) == 0) |
|
break; |
|
} |
|
swim3_select(fs, RELAX); |
|
udelay(150); |
|
fs->ejected = 1; |
|
release_drive(fs); |
|
return err; |
|
} |
|
|
|
static struct floppy_struct floppy_type = |
|
{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */ |
|
|
|
static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode, |
|
unsigned int cmd, unsigned long param) |
|
{ |
|
struct floppy_state *fs = bdev->bd_disk->private_data; |
|
int err; |
|
|
|
if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
if (fs->mdev->media_bay && |
|
check_media_bay(fs->mdev->media_bay) != MB_FD) |
|
return -ENXIO; |
|
|
|
switch (cmd) { |
|
case FDEJECT: |
|
if (fs->ref_count != 1) |
|
return -EBUSY; |
|
err = fd_eject(fs); |
|
return err; |
|
case FDGETPRM: |
|
if (copy_to_user((void __user *) param, &floppy_type, |
|
sizeof(struct floppy_struct))) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
return -ENOTTY; |
|
} |
|
|
|
static int floppy_ioctl(struct block_device *bdev, fmode_t mode, |
|
unsigned int cmd, unsigned long param) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&swim3_mutex); |
|
ret = floppy_locked_ioctl(bdev, mode, cmd, param); |
|
mutex_unlock(&swim3_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
static int floppy_open(struct block_device *bdev, fmode_t mode) |
|
{ |
|
struct floppy_state *fs = bdev->bd_disk->private_data; |
|
struct swim3 __iomem *sw = fs->swim3; |
|
int n, err = 0; |
|
|
|
if (fs->ref_count == 0) { |
|
if (fs->mdev->media_bay && |
|
check_media_bay(fs->mdev->media_bay) != MB_FD) |
|
return -ENXIO; |
|
out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2); |
|
out_8(&sw->control_bic, 0xff); |
|
out_8(&sw->mode, 0x95); |
|
udelay(10); |
|
out_8(&sw->intr_enable, 0); |
|
out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE); |
|
swim3_action(fs, MOTOR_ON); |
|
fs->write_prot = -1; |
|
fs->cur_cyl = -1; |
|
for (n = 0; n < 2 * HZ; ++n) { |
|
if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE)) |
|
break; |
|
if (signal_pending(current)) { |
|
err = -EINTR; |
|
break; |
|
} |
|
swim3_select(fs, RELAX); |
|
schedule_timeout_interruptible(1); |
|
} |
|
if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0 |
|
|| swim3_readbit(fs, DISK_IN) == 0)) |
|
err = -ENXIO; |
|
swim3_action(fs, SETMFM); |
|
swim3_select(fs, RELAX); |
|
|
|
} else if (fs->ref_count == -1 || mode & FMODE_EXCL) |
|
return -EBUSY; |
|
|
|
if (err == 0 && (mode & FMODE_NDELAY) == 0 |
|
&& (mode & (FMODE_READ|FMODE_WRITE))) { |
|
if (bdev_check_media_change(bdev)) |
|
floppy_revalidate(bdev->bd_disk); |
|
if (fs->ejected) |
|
err = -ENXIO; |
|
} |
|
|
|
if (err == 0 && (mode & FMODE_WRITE)) { |
|
if (fs->write_prot < 0) |
|
fs->write_prot = swim3_readbit(fs, WRITE_PROT); |
|
if (fs->write_prot) |
|
err = -EROFS; |
|
} |
|
|
|
if (err) { |
|
if (fs->ref_count == 0) { |
|
swim3_action(fs, MOTOR_OFF); |
|
out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE); |
|
swim3_select(fs, RELAX); |
|
} |
|
return err; |
|
} |
|
|
|
if (mode & FMODE_EXCL) |
|
fs->ref_count = -1; |
|
else |
|
++fs->ref_count; |
|
|
|
return 0; |
|
} |
|
|
|
static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&swim3_mutex); |
|
ret = floppy_open(bdev, mode); |
|
mutex_unlock(&swim3_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
static void floppy_release(struct gendisk *disk, fmode_t mode) |
|
{ |
|
struct floppy_state *fs = disk->private_data; |
|
struct swim3 __iomem *sw = fs->swim3; |
|
|
|
mutex_lock(&swim3_mutex); |
|
if (fs->ref_count > 0) |
|
--fs->ref_count; |
|
else if (fs->ref_count == -1) |
|
fs->ref_count = 0; |
|
if (fs->ref_count == 0) { |
|
swim3_action(fs, MOTOR_OFF); |
|
out_8(&sw->control_bic, 0xff); |
|
swim3_select(fs, RELAX); |
|
} |
|
mutex_unlock(&swim3_mutex); |
|
} |
|
|
|
static unsigned int floppy_check_events(struct gendisk *disk, |
|
unsigned int clearing) |
|
{ |
|
struct floppy_state *fs = disk->private_data; |
|
return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0; |
|
} |
|
|
|
static int floppy_revalidate(struct gendisk *disk) |
|
{ |
|
struct floppy_state *fs = disk->private_data; |
|
struct swim3 __iomem *sw; |
|
int ret, n; |
|
|
|
if (fs->mdev->media_bay && |
|
check_media_bay(fs->mdev->media_bay) != MB_FD) |
|
return -ENXIO; |
|
|
|
sw = fs->swim3; |
|
grab_drive(fs, revalidating, 0); |
|
out_8(&sw->intr_enable, 0); |
|
out_8(&sw->control_bis, DRIVE_ENABLE); |
|
swim3_action(fs, MOTOR_ON); /* necessary? */ |
|
fs->write_prot = -1; |
|
fs->cur_cyl = -1; |
|
mdelay(1); |
|
for (n = HZ; n > 0; --n) { |
|
if (swim3_readbit(fs, SEEK_COMPLETE)) |
|
break; |
|
if (signal_pending(current)) |
|
break; |
|
swim3_select(fs, RELAX); |
|
schedule_timeout_interruptible(1); |
|
} |
|
ret = swim3_readbit(fs, SEEK_COMPLETE) == 0 |
|
|| swim3_readbit(fs, DISK_IN) == 0; |
|
if (ret) |
|
swim3_action(fs, MOTOR_OFF); |
|
else { |
|
fs->ejected = 0; |
|
swim3_action(fs, SETMFM); |
|
} |
|
swim3_select(fs, RELAX); |
|
|
|
release_drive(fs); |
|
return ret; |
|
} |
|
|
|
static const struct block_device_operations floppy_fops = { |
|
.open = floppy_unlocked_open, |
|
.release = floppy_release, |
|
.ioctl = floppy_ioctl, |
|
.check_events = floppy_check_events, |
|
}; |
|
|
|
static const struct blk_mq_ops swim3_mq_ops = { |
|
.queue_rq = swim3_queue_rq, |
|
}; |
|
|
|
static void swim3_mb_event(struct macio_dev* mdev, int mb_state) |
|
{ |
|
struct floppy_state *fs = macio_get_drvdata(mdev); |
|
struct swim3 __iomem *sw; |
|
|
|
if (!fs) |
|
return; |
|
|
|
sw = fs->swim3; |
|
|
|
if (mb_state != MB_FD) |
|
return; |
|
|
|
/* Clear state */ |
|
out_8(&sw->intr_enable, 0); |
|
in_8(&sw->intr); |
|
in_8(&sw->error); |
|
} |
|
|
|
static int swim3_add_device(struct macio_dev *mdev, int index) |
|
{ |
|
struct device_node *swim = mdev->ofdev.dev.of_node; |
|
struct floppy_state *fs = &floppy_states[index]; |
|
int rc = -EBUSY; |
|
|
|
fs->mdev = mdev; |
|
fs->index = index; |
|
|
|
/* Check & Request resources */ |
|
if (macio_resource_count(mdev) < 2) { |
|
swim3_err("%s", "No address in device-tree\n"); |
|
return -ENXIO; |
|
} |
|
if (macio_irq_count(mdev) < 1) { |
|
swim3_err("%s", "No interrupt in device-tree\n"); |
|
return -ENXIO; |
|
} |
|
if (macio_request_resource(mdev, 0, "swim3 (mmio)")) { |
|
swim3_err("%s", "Can't request mmio resource\n"); |
|
return -EBUSY; |
|
} |
|
if (macio_request_resource(mdev, 1, "swim3 (dma)")) { |
|
swim3_err("%s", "Can't request dma resource\n"); |
|
macio_release_resource(mdev, 0); |
|
return -EBUSY; |
|
} |
|
dev_set_drvdata(&mdev->ofdev.dev, fs); |
|
|
|
if (mdev->media_bay == NULL) |
|
pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1); |
|
|
|
fs->state = idle; |
|
fs->swim3 = (struct swim3 __iomem *) |
|
ioremap(macio_resource_start(mdev, 0), 0x200); |
|
if (fs->swim3 == NULL) { |
|
swim3_err("%s", "Couldn't map mmio registers\n"); |
|
rc = -ENOMEM; |
|
goto out_release; |
|
} |
|
fs->dma = (struct dbdma_regs __iomem *) |
|
ioremap(macio_resource_start(mdev, 1), 0x200); |
|
if (fs->dma == NULL) { |
|
swim3_err("%s", "Couldn't map dma registers\n"); |
|
iounmap(fs->swim3); |
|
rc = -ENOMEM; |
|
goto out_release; |
|
} |
|
fs->swim3_intr = macio_irq(mdev, 0); |
|
fs->dma_intr = macio_irq(mdev, 1); |
|
fs->cur_cyl = -1; |
|
fs->cur_sector = -1; |
|
fs->secpercyl = 36; |
|
fs->secpertrack = 18; |
|
fs->total_secs = 2880; |
|
init_waitqueue_head(&fs->wait); |
|
|
|
fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space); |
|
memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd)); |
|
fs->dma_cmd[1].command = cpu_to_le16(DBDMA_STOP); |
|
|
|
if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD) |
|
swim3_mb_event(mdev, MB_FD); |
|
|
|
if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) { |
|
swim3_err("%s", "Couldn't request interrupt\n"); |
|
pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0); |
|
goto out_unmap; |
|
} |
|
|
|
timer_setup(&fs->timeout, NULL, 0); |
|
|
|
swim3_info("SWIM3 floppy controller %s\n", |
|
mdev->media_bay ? "in media bay" : ""); |
|
|
|
return 0; |
|
|
|
out_unmap: |
|
iounmap(fs->dma); |
|
iounmap(fs->swim3); |
|
|
|
out_release: |
|
macio_release_resource(mdev, 0); |
|
macio_release_resource(mdev, 1); |
|
|
|
return rc; |
|
} |
|
|
|
static int swim3_attach(struct macio_dev *mdev, |
|
const struct of_device_id *match) |
|
{ |
|
struct floppy_state *fs; |
|
struct gendisk *disk; |
|
int rc; |
|
|
|
if (floppy_count >= MAX_FLOPPIES) |
|
return -ENXIO; |
|
|
|
if (floppy_count == 0) { |
|
rc = register_blkdev(FLOPPY_MAJOR, "fd"); |
|
if (rc) |
|
return rc; |
|
} |
|
|
|
fs = &floppy_states[floppy_count]; |
|
memset(fs, 0, sizeof(*fs)); |
|
|
|
rc = blk_mq_alloc_sq_tag_set(&fs->tag_set, &swim3_mq_ops, 2, |
|
BLK_MQ_F_SHOULD_MERGE); |
|
if (rc) |
|
goto out_unregister; |
|
|
|
disk = blk_mq_alloc_disk(&fs->tag_set, fs); |
|
if (IS_ERR(disk)) { |
|
rc = PTR_ERR(disk); |
|
goto out_free_tag_set; |
|
} |
|
|
|
rc = swim3_add_device(mdev, floppy_count); |
|
if (rc) |
|
goto out_cleanup_disk; |
|
|
|
disk->major = FLOPPY_MAJOR; |
|
disk->first_minor = floppy_count; |
|
disk->minors = 1; |
|
disk->fops = &floppy_fops; |
|
disk->private_data = fs; |
|
disk->events = DISK_EVENT_MEDIA_CHANGE; |
|
disk->flags |= GENHD_FL_REMOVABLE; |
|
sprintf(disk->disk_name, "fd%d", floppy_count); |
|
set_capacity(disk, 2880); |
|
add_disk(disk); |
|
|
|
disks[floppy_count++] = disk; |
|
return 0; |
|
|
|
out_cleanup_disk: |
|
blk_cleanup_disk(disk); |
|
out_free_tag_set: |
|
blk_mq_free_tag_set(&fs->tag_set); |
|
out_unregister: |
|
if (floppy_count == 0) |
|
unregister_blkdev(FLOPPY_MAJOR, "fd"); |
|
return rc; |
|
} |
|
|
|
static const struct of_device_id swim3_match[] = |
|
{ |
|
{ |
|
.name = "swim3", |
|
}, |
|
{ |
|
.compatible = "ohare-swim3" |
|
}, |
|
{ |
|
.compatible = "swim3" |
|
}, |
|
{ /* end of list */ } |
|
}; |
|
|
|
static struct macio_driver swim3_driver = |
|
{ |
|
.driver = { |
|
.name = "swim3", |
|
.of_match_table = swim3_match, |
|
}, |
|
.probe = swim3_attach, |
|
#ifdef CONFIG_PMAC_MEDIABAY |
|
.mediabay_event = swim3_mb_event, |
|
#endif |
|
#if 0 |
|
.suspend = swim3_suspend, |
|
.resume = swim3_resume, |
|
#endif |
|
}; |
|
|
|
|
|
int swim3_init(void) |
|
{ |
|
macio_register_driver(&swim3_driver); |
|
return 0; |
|
} |
|
|
|
module_init(swim3_init) |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Paul Mackerras"); |
|
MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
|
|
|