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-rw-r--r--drivers/ide/cris/ide-v10.c842
1 files changed, 0 insertions, 842 deletions
diff --git a/drivers/ide/cris/ide-v10.c b/drivers/ide/cris/ide-v10.c
deleted file mode 100644
index 5b40220..0000000
--- a/drivers/ide/cris/ide-v10.c
+++ /dev/null
@@ -1,842 +0,0 @@
-/* $Id: ide.c,v 1.4 2004/10/12 07:55:48 starvik Exp $
- *
- * Etrax specific IDE functions, like init and PIO-mode setting etc.
- * Almost the entire ide.c is used for the rest of the Etrax ATA driver.
- * Copyright (c) 2000-2004 Axis Communications AB
- *
- * Authors: Bjorn Wesen (initial version)
- * Mikael Starvik (pio setup stuff, Linux 2.6 port)
- */
-
-/* Regarding DMA:
- *
- * There are two forms of DMA - "DMA handshaking" between the interface and the drive,
- * and DMA between the memory and the interface. We can ALWAYS use the latter, since it's
- * something built-in in the Etrax. However only some drives support the DMA-mode handshaking
- * on the ATA-bus. The normal PC driver and Triton interface disables memory-if DMA when the
- * device can't do DMA handshaking for some stupid reason. We don't need to do that.
- */
-
-#undef REALLY_SLOW_IO /* most systems can safely undef this */
-
-#include <linux/config.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/timer.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/blkdev.h>
-#include <linux/hdreg.h>
-#include <linux/ide.h>
-#include <linux/init.h>
-#include <linux/scatterlist.h>
-
-#include <asm/io.h>
-#include <asm/arch/svinto.h>
-#include <asm/dma.h>
-
-/* number of Etrax DMA descriptors */
-#define MAX_DMA_DESCRS 64
-
-/* number of times to retry busy-flags when reading/writing IDE-registers
- * this can't be too high because a hung harddisk might cause the watchdog
- * to trigger (sometimes INB and OUTB are called with irq's disabled)
- */
-
-#define IDE_REGISTER_TIMEOUT 300
-
-static int e100_read_command = 0;
-
-#define LOWDB(x)
-#define D(x)
-
-static int e100_ide_build_dmatable (ide_drive_t *drive);
-static ide_startstop_t etrax_dma_intr (ide_drive_t *drive);
-
-void
-etrax100_ide_outw(unsigned short data, unsigned long reg) {
- int timeleft;
- LOWDB(printk("ow: data 0x%x, reg 0x%x\n", data, reg));
-
- /* note the lack of handling any timeouts. we stop waiting, but we don't
- * really notify anybody.
- */
-
- timeleft = IDE_REGISTER_TIMEOUT;
- /* wait for busy flag */
- while(timeleft && (*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy)))
- timeleft--;
-
- /*
- * Fall through at a timeout, so the ongoing command will be
- * aborted by the write below, which is expected to be a dummy
- * command to the command register. This happens when a faulty
- * drive times out on a command. See comment on timeout in
- * INB.
- */
- if(!timeleft)
- printk("ATA timeout reg 0x%lx := 0x%x\n", reg, data);
-
- *R_ATA_CTRL_DATA = reg | data; /* write data to the drive's register */
-
- timeleft = IDE_REGISTER_TIMEOUT;
- /* wait for transmitter ready */
- while(timeleft && !(*R_ATA_STATUS_DATA &
- IO_MASK(R_ATA_STATUS_DATA, tr_rdy)))
- timeleft--;
-}
-
-void
-etrax100_ide_outb(unsigned char data, unsigned long reg)
-{
- etrax100_ide_outw(data, reg);
-}
-
-void
-etrax100_ide_outbsync(ide_drive_t *drive, u8 addr, unsigned long port)
-{
- etrax100_ide_outw(addr, port);
-}
-
-unsigned short
-etrax100_ide_inw(unsigned long reg) {
- int status;
- int timeleft;
-
- timeleft = IDE_REGISTER_TIMEOUT;
- /* wait for busy flag */
- while(timeleft && (*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy)))
- timeleft--;
-
- if(!timeleft) {
- /*
- * If we're asked to read the status register, like for
- * example when a command does not complete for an
- * extended time, but the ATA interface is stuck in a
- * busy state at the *ETRAX* ATA interface level (as has
- * happened repeatedly with at least one bad disk), then
- * the best thing to do is to pretend that we read
- * "busy" in the status register, so the IDE driver will
- * time-out, abort the ongoing command and perform a
- * reset sequence. Note that the subsequent OUT_BYTE
- * call will also timeout on busy, but as long as the
- * write is still performed, everything will be fine.
- */
- if ((reg & IO_MASK (R_ATA_CTRL_DATA, addr))
- == IO_FIELD (R_ATA_CTRL_DATA, addr, IDE_STATUS_OFFSET))
- return BUSY_STAT;
- else
- /* For other rare cases we assume 0 is good enough. */
- return 0;
- }
-
- *R_ATA_CTRL_DATA = reg | IO_STATE(R_ATA_CTRL_DATA, rw, read); /* read data */
-
- timeleft = IDE_REGISTER_TIMEOUT;
- /* wait for available */
- while(timeleft && !((status = *R_ATA_STATUS_DATA) &
- IO_MASK(R_ATA_STATUS_DATA, dav)))
- timeleft--;
-
- if(!timeleft)
- return 0;
-
- LOWDB(printk("inb: 0x%x from reg 0x%x\n", status & 0xff, reg));
-
- return (unsigned short)status;
-}
-
-unsigned char
-etrax100_ide_inb(unsigned long reg)
-{
- return (unsigned char)etrax100_ide_inw(reg);
-}
-
-/* PIO timing (in R_ATA_CONFIG)
- *
- * _____________________________
- * ADDRESS : ________/
- *
- * _______________
- * DIOR : ____________/ \__________
- *
- * _______________
- * DATA : XXXXXXXXXXXXXXXX_______________XXXXXXXX
- *
- *
- * DIOR is unbuffered while address and data is buffered.
- * This creates two problems:
- * 1. The DIOR pulse is to early (because it is unbuffered)
- * 2. The rise time of DIOR is long
- *
- * There are at least three different plausible solutions
- * 1. Use a pad capable of larger currents in Etrax
- * 2. Use an external buffer
- * 3. Make the strobe pulse longer
- *
- * Some of the strobe timings below are modified to compensate
- * for this. This implies a slight performance decrease.
- *
- * THIS SHOULD NEVER BE CHANGED!
- *
- * TODO: Is this true for the latest LX boards still ?
- */
-
-#define ATA_DMA2_STROBE 4
-#define ATA_DMA2_HOLD 0
-#define ATA_DMA1_STROBE 4
-#define ATA_DMA1_HOLD 1
-#define ATA_DMA0_STROBE 12
-#define ATA_DMA0_HOLD 9
-#define ATA_PIO4_SETUP 1
-#define ATA_PIO4_STROBE 5
-#define ATA_PIO4_HOLD 0
-#define ATA_PIO3_SETUP 1
-#define ATA_PIO3_STROBE 5
-#define ATA_PIO3_HOLD 1
-#define ATA_PIO2_SETUP 1
-#define ATA_PIO2_STROBE 6
-#define ATA_PIO2_HOLD 2
-#define ATA_PIO1_SETUP 2
-#define ATA_PIO1_STROBE 11
-#define ATA_PIO1_HOLD 4
-#define ATA_PIO0_SETUP 4
-#define ATA_PIO0_STROBE 19
-#define ATA_PIO0_HOLD 4
-
-static int e100_dma_check (ide_drive_t *drive);
-static void e100_dma_start(ide_drive_t *drive);
-static int e100_dma_end (ide_drive_t *drive);
-static void e100_ide_input_data (ide_drive_t *drive, void *, unsigned int);
-static void e100_ide_output_data (ide_drive_t *drive, void *, unsigned int);
-static void e100_atapi_input_bytes(ide_drive_t *drive, void *, unsigned int);
-static void e100_atapi_output_bytes(ide_drive_t *drive, void *, unsigned int);
-static int e100_dma_off (ide_drive_t *drive);
-
-
-/*
- * good_dma_drives() lists the model names (from "hdparm -i")
- * of drives which do not support mword2 DMA but which are
- * known to work fine with this interface under Linux.
- */
-
-const char *good_dma_drives[] = {"Micropolis 2112A",
- "CONNER CTMA 4000",
- "CONNER CTT8000-A",
- NULL};
-
-static void tune_e100_ide(ide_drive_t *drive, byte pio)
-{
- pio = 4;
- /* pio = ide_get_best_pio_mode(drive, pio, 4, NULL); */
-
- /* set pio mode! */
-
- switch(pio) {
- case 0:
- *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) |
- IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) |
- IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO0_SETUP ) |
- IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO0_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO0_HOLD ) );
- break;
- case 1:
- *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) |
- IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) |
- IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO1_SETUP ) |
- IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO1_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO1_HOLD ) );
- break;
- case 2:
- *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) |
- IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) |
- IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO2_SETUP ) |
- IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO2_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO2_HOLD ) );
- break;
- case 3:
- *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) |
- IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) |
- IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO3_SETUP ) |
- IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO3_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO3_HOLD ) );
- break;
- case 4:
- *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) |
- IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) |
- IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO4_SETUP ) |
- IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO4_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO4_HOLD ) );
- break;
- }
-}
-
-static int e100_dma_setup(ide_drive_t *drive)
-{
- struct request *rq = drive->hwif->hwgroup->rq;
-
- if (rq_data_dir(rq)) {
- e100_read_command = 0;
-
- RESET_DMA(ATA_TX_DMA_NBR); /* sometimes the DMA channel get stuck so we need to do this */
- WAIT_DMA(ATA_TX_DMA_NBR);
- } else {
- e100_read_command = 1;
-
- RESET_DMA(ATA_RX_DMA_NBR); /* sometimes the DMA channel get stuck so we need to do this */
- WAIT_DMA(ATA_RX_DMA_NBR);
- }
-
- /* set up the Etrax DMA descriptors */
- if (e100_ide_build_dmatable(drive)) {
- ide_map_sg(drive, rq);
- return 1;
- }
-
- return 0;
-}
-
-static void e100_dma_exec_cmd(ide_drive_t *drive, u8 command)
-{
- /* set the irq handler which will finish the request when DMA is done */
- ide_set_handler(drive, &etrax_dma_intr, WAIT_CMD, NULL);
-
- /* issue cmd to drive */
- etrax100_ide_outb(command, IDE_COMMAND_REG);
-}
-
-void __init
-init_e100_ide (void)
-{
- volatile unsigned int dummy;
- int h;
-
- printk("ide: ETRAX 100LX built-in ATA DMA controller\n");
-
- /* first fill in some stuff in the ide_hwifs fields */
-
- for(h = 0; h < MAX_HWIFS; h++) {
- ide_hwif_t *hwif = &ide_hwifs[h];
- hwif->mmio = 2;
- hwif->chipset = ide_etrax100;
- hwif->tuneproc = &tune_e100_ide;
- hwif->ata_input_data = &e100_ide_input_data;
- hwif->ata_output_data = &e100_ide_output_data;
- hwif->atapi_input_bytes = &e100_atapi_input_bytes;
- hwif->atapi_output_bytes = &e100_atapi_output_bytes;
- hwif->ide_dma_check = &e100_dma_check;
- hwif->ide_dma_end = &e100_dma_end;
- hwif->dma_setup = &e100_dma_setup;
- hwif->dma_exec_cmd = &e100_dma_exec_cmd;
- hwif->dma_start = &e100_dma_start;
- hwif->OUTB = &etrax100_ide_outb;
- hwif->OUTW = &etrax100_ide_outw;
- hwif->OUTBSYNC = &etrax100_ide_outbsync;
- hwif->INB = &etrax100_ide_inb;
- hwif->INW = &etrax100_ide_inw;
- hwif->ide_dma_off_quietly = &e100_dma_off;
- }
-
- /* actually reset and configure the etrax100 ide/ata interface */
-
- *R_ATA_CTRL_DATA = 0;
- *R_ATA_TRANSFER_CNT = 0;
- *R_ATA_CONFIG = 0;
-
- genconfig_shadow = (genconfig_shadow &
- ~IO_MASK(R_GEN_CONFIG, dma2) &
- ~IO_MASK(R_GEN_CONFIG, dma3) &
- ~IO_MASK(R_GEN_CONFIG, ata)) |
- ( IO_STATE( R_GEN_CONFIG, dma3, ata ) |
- IO_STATE( R_GEN_CONFIG, dma2, ata ) |
- IO_STATE( R_GEN_CONFIG, ata, select ) );
-
- *R_GEN_CONFIG = genconfig_shadow;
-
- /* pull the chosen /reset-line low */
-
-#ifdef CONFIG_ETRAX_IDE_G27_RESET
- REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, 27, 0);
-#endif
-#ifdef CONFIG_ETRAX_IDE_CSE1_16_RESET
- REG_SHADOW_SET(port_cse1_addr, port_cse1_shadow, 16, 0);
-#endif
-#ifdef CONFIG_ETRAX_IDE_CSP0_8_RESET
- REG_SHADOW_SET(port_csp0_addr, port_csp0_shadow, 8, 0);
-#endif
-#ifdef CONFIG_ETRAX_IDE_PB7_RESET
- port_pb_dir_shadow = port_pb_dir_shadow |
- IO_STATE(R_PORT_PB_DIR, dir7, output);
- *R_PORT_PB_DIR = port_pb_dir_shadow;
- REG_SHADOW_SET(R_PORT_PB_DATA, port_pb_data_shadow, 7, 1);
-#endif
-
- /* wait some */
-
- udelay(25);
-
- /* de-assert bus-reset */
-
-#ifdef CONFIG_ETRAX_IDE_CSE1_16_RESET
- REG_SHADOW_SET(port_cse1_addr, port_cse1_shadow, 16, 1);
-#endif
-#ifdef CONFIG_ETRAX_IDE_CSP0_8_RESET
- REG_SHADOW_SET(port_csp0_addr, port_csp0_shadow, 8, 1);
-#endif
-#ifdef CONFIG_ETRAX_IDE_G27_RESET
- REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, 27, 1);
-#endif
-
- /* make a dummy read to set the ata controller in a proper state */
- dummy = *R_ATA_STATUS_DATA;
-
- *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) |
- IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) |
- IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO4_SETUP ) |
- IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO4_STROBE ) |
- IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO4_HOLD ) );
-
- *R_ATA_CTRL_DATA = ( IO_STATE( R_ATA_CTRL_DATA, rw, read) |
- IO_FIELD( R_ATA_CTRL_DATA, addr, 1 ) );
-
- while(*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy)); /* wait for busy flag*/
-
- *R_IRQ_MASK0_SET = ( IO_STATE( R_IRQ_MASK0_SET, ata_irq0, set ) |
- IO_STATE( R_IRQ_MASK0_SET, ata_irq1, set ) |
- IO_STATE( R_IRQ_MASK0_SET, ata_irq2, set ) |
- IO_STATE( R_IRQ_MASK0_SET, ata_irq3, set ) );
-
- printk("ide: waiting %d seconds for drives to regain consciousness\n",
- CONFIG_ETRAX_IDE_DELAY);
-
- h = jiffies + (CONFIG_ETRAX_IDE_DELAY * HZ);
- while(time_before(jiffies, h)) /* nothing */ ;
-
- /* reset the dma channels we will use */
-
- RESET_DMA(ATA_TX_DMA_NBR);
- RESET_DMA(ATA_RX_DMA_NBR);
- WAIT_DMA(ATA_TX_DMA_NBR);
- WAIT_DMA(ATA_RX_DMA_NBR);
-
-}
-
-static int e100_dma_off (ide_drive_t *drive)
-{
- return 0;
-}
-
-static etrax_dma_descr mydescr;
-
-/*
- * The following routines are mainly used by the ATAPI drivers.
- *
- * These routines will round up any request for an odd number of bytes,
- * so if an odd bytecount is specified, be sure that there's at least one
- * extra byte allocated for the buffer.
- */
-static void
-e100_atapi_input_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount)
-{
- unsigned long data_reg = IDE_DATA_REG;
-
- D(printk("atapi_input_bytes, dreg 0x%x, buffer 0x%x, count %d\n",
- data_reg, buffer, bytecount));
-
- if(bytecount & 1) {
- printk("warning, odd bytecount in cdrom_in_bytes = %d.\n", bytecount);
- bytecount++; /* to round off */
- }
-
- /* make sure the DMA channel is available */
- RESET_DMA(ATA_RX_DMA_NBR);
- WAIT_DMA(ATA_RX_DMA_NBR);
-
- /* setup DMA descriptor */
-
- mydescr.sw_len = bytecount;
- mydescr.ctrl = d_eol;
- mydescr.buf = virt_to_phys(buffer);
-
- /* start the dma channel */
-
- *R_DMA_CH3_FIRST = virt_to_phys(&mydescr);
- *R_DMA_CH3_CMD = IO_STATE(R_DMA_CH3_CMD, cmd, start);
-
- /* initiate a multi word dma read using PIO handshaking */
-
- *R_ATA_TRANSFER_CNT = IO_FIELD(R_ATA_TRANSFER_CNT, count, bytecount >> 1);
-
- *R_ATA_CTRL_DATA = data_reg |
- IO_STATE(R_ATA_CTRL_DATA, rw, read) |
- IO_STATE(R_ATA_CTRL_DATA, src_dst, dma) |
- IO_STATE(R_ATA_CTRL_DATA, handsh, pio) |
- IO_STATE(R_ATA_CTRL_DATA, multi, on) |
- IO_STATE(R_ATA_CTRL_DATA, dma_size, word);
-
- /* wait for completion */
-
- LED_DISK_READ(1);
- WAIT_DMA(ATA_RX_DMA_NBR);
- LED_DISK_READ(0);
-
-#if 0
- /* old polled transfer code
- * this should be moved into a new function that can do polled
- * transfers if DMA is not available
- */
-
- /* initiate a multi word read */
-
- *R_ATA_TRANSFER_CNT = wcount << 1;
-
- *R_ATA_CTRL_DATA = data_reg |
- IO_STATE(R_ATA_CTRL_DATA, rw, read) |
- IO_STATE(R_ATA_CTRL_DATA, src_dst, register) |
- IO_STATE(R_ATA_CTRL_DATA, handsh, pio) |
- IO_STATE(R_ATA_CTRL_DATA, multi, on) |
- IO_STATE(R_ATA_CTRL_DATA, dma_size, word);
-
- /* svinto has a latency until the busy bit actually is set */
-
- nop(); nop();
- nop(); nop();
- nop(); nop();
- nop(); nop();
- nop(); nop();
-
- /* unit should be busy during multi transfer */
- while((status = *R_ATA_STATUS_DATA) & IO_MASK(R_ATA_STATUS_DATA, busy)) {
- while(!(status & IO_MASK(R_ATA_STATUS_DATA, dav)))
- status = *R_ATA_STATUS_DATA;
- *ptr++ = (unsigned short)(status & 0xffff);
- }
-#endif
-}
-
-static void
-e100_atapi_output_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount)
-{
- unsigned long data_reg = IDE_DATA_REG;
-
- D(printk("atapi_output_bytes, dreg 0x%x, buffer 0x%x, count %d\n",
- data_reg, buffer, bytecount));
-
- if(bytecount & 1) {
- printk("odd bytecount %d in atapi_out_bytes!\n", bytecount);
- bytecount++;
- }
-
- /* make sure the DMA channel is available */
- RESET_DMA(ATA_TX_DMA_NBR);
- WAIT_DMA(ATA_TX_DMA_NBR);
-
- /* setup DMA descriptor */
-
- mydescr.sw_len = bytecount;
- mydescr.ctrl = d_eol;
- mydescr.buf = virt_to_phys(buffer);
-
- /* start the dma channel */
-
- *R_DMA_CH2_FIRST = virt_to_phys(&mydescr);
- *R_DMA_CH2_CMD = IO_STATE(R_DMA_CH2_CMD, cmd, start);
-
- /* initiate a multi word dma write using PIO handshaking */
-
- *R_ATA_TRANSFER_CNT = IO_FIELD(R_ATA_TRANSFER_CNT, count, bytecount >> 1);
-
- *R_ATA_CTRL_DATA = data_reg |
- IO_STATE(R_ATA_CTRL_DATA, rw, write) |
- IO_STATE(R_ATA_CTRL_DATA, src_dst, dma) |
- IO_STATE(R_ATA_CTRL_DATA, handsh, pio) |
- IO_STATE(R_ATA_CTRL_DATA, multi, on) |
- IO_STATE(R_ATA_CTRL_DATA, dma_size, word);
-
- /* wait for completion */
-
- LED_DISK_WRITE(1);
- WAIT_DMA(ATA_TX_DMA_NBR);
- LED_DISK_WRITE(0);
-
-#if 0
- /* old polled write code - see comment in input_bytes */
-
- /* wait for busy flag */
- while(*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy));
-
- /* initiate a multi word write */
-
- *R_ATA_TRANSFER_CNT = bytecount >> 1;
-
- ctrl = data_reg |
- IO_STATE(R_ATA_CTRL_DATA, rw, write) |
- IO_STATE(R_ATA_CTRL_DATA, src_dst, register) |
- IO_STATE(R_ATA_CTRL_DATA, handsh, pio) |
- IO_STATE(R_ATA_CTRL_DATA, multi, on) |
- IO_STATE(R_ATA_CTRL_DATA, dma_size, word);
-
- LED_DISK_WRITE(1);
-
- /* Etrax will set busy = 1 until the multi pio transfer has finished
- * and tr_rdy = 1 after each successful word transfer.
- * When the last byte has been transferred Etrax will first set tr_tdy = 1
- * and then busy = 0 (not in the same cycle). If we read busy before it
- * has been set to 0 we will think that we should transfer more bytes
- * and then tr_rdy would be 0 forever. This is solved by checking busy
- * in the inner loop.
- */
-
- do {
- *R_ATA_CTRL_DATA = ctrl | *ptr++;
- while(!(*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, tr_rdy)) &&
- (*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy)));
- } while(*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy));
-
- LED_DISK_WRITE(0);
-#endif
-
-}
-
-/*
- * This is used for most PIO data transfers *from* the IDE interface
- */
-static void
-e100_ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
-{
- e100_atapi_input_bytes(drive, buffer, wcount << 2);
-}
-
-/*
- * This is used for most PIO data transfers *to* the IDE interface
- */
-static void
-e100_ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
-{
- e100_atapi_output_bytes(drive, buffer, wcount << 2);
-}
-
-/* we only have one DMA channel on the chip for ATA, so we can keep these statically */
-static etrax_dma_descr ata_descrs[MAX_DMA_DESCRS];
-static unsigned int ata_tot_size;
-
-/*
- * e100_ide_build_dmatable() prepares a dma request.
- * Returns 0 if all went okay, returns 1 otherwise.
- */
-static int e100_ide_build_dmatable (ide_drive_t *drive)
-{
- ide_hwif_t *hwif = HWIF(drive);
- struct scatterlist* sg;
- struct request *rq = HWGROUP(drive)->rq;
- unsigned long size, addr;
- unsigned int count = 0;
- int i = 0;
-
- sg = hwif->sg_table;
-
- ata_tot_size = 0;
-
- ide_map_sg(drive, rq);
-
- i = hwif->sg_nents;
-
- while(i) {
- /*
- * Determine addr and size of next buffer area. We assume that
- * individual virtual buffers are always composed linearly in
- * physical memory. For example, we assume that any 8kB buffer
- * is always composed of two adjacent physical 4kB pages rather
- * than two possibly non-adjacent physical 4kB pages.
- */
- /* group sequential buffers into one large buffer */
- addr = page_to_phys(sg->page) + sg->offset;
- size = sg_dma_len(sg);
- while (sg++, --i) {
- if ((addr + size) != page_to_phys(sg->page) + sg->offset)
- break;
- size += sg_dma_len(sg);
- }
-
- /* did we run out of descriptors? */
-
- if(count >= MAX_DMA_DESCRS) {
- printk("%s: too few DMA descriptors\n", drive->name);
- return 1;
- }
-
- /* however, this case is more difficult - R_ATA_TRANSFER_CNT cannot be more
- than 65536 words per transfer, so in that case we need to either
- 1) use a DMA interrupt to re-trigger R_ATA_TRANSFER_CNT and continue with
- the descriptors, or
- 2) simply do the request here, and get dma_intr to only ide_end_request on
- those blocks that were actually set-up for transfer.
- */
-
- if(ata_tot_size + size > 131072) {
- printk("too large total ATA DMA request, %d + %d!\n", ata_tot_size, (int)size);
- return 1;
- }
-
- /* If size > 65536 it has to be splitted into new descriptors. Since we don't handle
- size > 131072 only one split is necessary */
-
- if(size > 65536) {
- /* ok we want to do IO at addr, size bytes. set up a new descriptor entry */
- ata_descrs[count].sw_len = 0; /* 0 means 65536, this is a 16-bit field */
- ata_descrs[count].ctrl = 0;
- ata_descrs[count].buf = addr;
- ata_descrs[count].next = virt_to_phys(&ata_descrs[count + 1]);
- count++;
- ata_tot_size += 65536;
- /* size and addr should refere to not handled data */
- size -= 65536;
- addr += 65536;
- }
- /* ok we want to do IO at addr, size bytes. set up a new descriptor entry */
- if(size == 65536) {
- ata_descrs[count].sw_len = 0; /* 0 means 65536, this is a 16-bit field */
- } else {
- ata_descrs[count].sw_len = size;
- }
- ata_descrs[count].ctrl = 0;
- ata_descrs[count].buf = addr;
- ata_descrs[count].next = virt_to_phys(&ata_descrs[count + 1]);
- count++;
- ata_tot_size += size;
- }
-
- if (count) {
- /* set the end-of-list flag on the last descriptor */
- ata_descrs[count - 1].ctrl |= d_eol;
- /* return and say all is ok */
- return 0;
- }
-
- printk("%s: empty DMA table?\n", drive->name);
- return 1; /* let the PIO routines handle this weirdness */
-}
-
-static int config_drive_for_dma (ide_drive_t *drive)
-{
- const char **list;
- struct hd_driveid *id = drive->id;
-
- if (id && (id->capability & 1)) {
- /* Enable DMA on any drive that supports mword2 DMA */
- if ((id->field_valid & 2) && (id->dma_mword & 0x404) == 0x404) {
- drive->using_dma = 1;
- return 0; /* DMA enabled */
- }
-
- /* Consult the list of known "good" drives */
- list = good_dma_drives;
- while (*list) {
- if (!strcmp(*list++,id->model)) {
- drive->using_dma = 1;
- return 0; /* DMA enabled */
- }
- }
- }
- return 1; /* DMA not enabled */
-}
-
-/*
- * etrax_dma_intr() is the handler for disk read/write DMA interrupts
- */
-static ide_startstop_t etrax_dma_intr (ide_drive_t *drive)
-{
- LED_DISK_READ(0);
- LED_DISK_WRITE(0);
-
- return ide_dma_intr(drive);
-}
-
-/*
- * Functions below initiates/aborts DMA read/write operations on a drive.
- *
- * The caller is assumed to have selected the drive and programmed the drive's
- * sector address using CHS or LBA. All that remains is to prepare for DMA
- * and then issue the actual read/write DMA/PIO command to the drive.
- *
- * Returns 0 if all went well.
- * Returns 1 if DMA read/write could not be started, in which case
- * the caller should revert to PIO for the current request.
- */
-
-static int e100_dma_check(ide_drive_t *drive)
-{
- return config_drive_for_dma (drive);
-}
-
-static int e100_dma_end(ide_drive_t *drive)
-{
- /* TODO: check if something went wrong with the DMA */
- return 0;
-}
-
-static void e100_dma_start(ide_drive_t *drive)
-{
- if (e100_read_command) {
- /* begin DMA */
-
- /* need to do this before RX DMA due to a chip bug
- * it is enough to just flush the part of the cache that
- * corresponds to the buffers we start, but since HD transfers
- * usually are more than 8 kB, it is easier to optimize for the
- * normal case and just flush the entire cache. its the only
- * way to be sure! (OB movie quote)
- */
- flush_etrax_cache();
- *R_DMA_CH3_FIRST = virt_to_phys(ata_descrs);
- *R_DMA_CH3_CMD = IO_STATE(R_DMA_CH3_CMD, cmd, start);
-
- /* initiate a multi word dma read using DMA handshaking */
-
- *R_ATA_TRANSFER_CNT =
- IO_FIELD(R_ATA_TRANSFER_CNT, count, ata_tot_size >> 1);
-
- *R_ATA_CTRL_DATA =
- IO_FIELD(R_ATA_CTRL_DATA, data, IDE_DATA_REG) |
- IO_STATE(R_ATA_CTRL_DATA, rw, read) |
- IO_STATE(R_ATA_CTRL_DATA, src_dst, dma) |
- IO_STATE(R_ATA_CTRL_DATA, handsh, dma) |
- IO_STATE(R_ATA_CTRL_DATA, multi, on) |
- IO_STATE(R_ATA_CTRL_DATA, dma_size, word);
-
- LED_DISK_READ(1);
-
- D(printk("dma read of %d bytes.\n", ata_tot_size));
-
- } else {
- /* writing */
- /* begin DMA */
-
- *R_DMA_CH2_FIRST = virt_to_phys(ata_descrs);
- *R_DMA_CH2_CMD = IO_STATE(R_DMA_CH2_CMD, cmd, start);
-
- /* initiate a multi word dma write using DMA handshaking */
-
- *R_ATA_TRANSFER_CNT =
- IO_FIELD(R_ATA_TRANSFER_CNT, count, ata_tot_size >> 1);
-
- *R_ATA_CTRL_DATA =
- IO_FIELD(R_ATA_CTRL_DATA, data, IDE_DATA_REG) |
- IO_STATE(R_ATA_CTRL_DATA, rw, write) |
- IO_STATE(R_ATA_CTRL_DATA, src_dst, dma) |
- IO_STATE(R_ATA_CTRL_DATA, handsh, dma) |
- IO_STATE(R_ATA_CTRL_DATA, multi, on) |
- IO_STATE(R_ATA_CTRL_DATA, dma_size, word);
-
- LED_DISK_WRITE(1);
-
- D(printk("dma write of %d bytes.\n", ata_tot_size));
- }
-}
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