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![Tejun Heo](/assets/img/avatar_default.png)
Currently reset methods are not specified directly in the ata_port_operations table. If a LLD wants to use custom reset methods, it should construct and use a error_handler which uses those reset methods. It's done this way for two reasons. First, the ops table already contained too many methods and adding four more of them would noticeably increase the amount of necessary boilerplate code all over low level drivers. Second, as ->error_handler uses those reset methods, it can get confusing. ie. By overriding ->error_handler, those reset ops can be made useless making layering a bit hazy. Now that ops table uses inheritance, the first problem doesn't exist anymore. The second isn't completely solved but is relieved by providing default values - most drivers can just override what it has implemented and don't have to concern itself about higher level callbacks. In fact, there currently is no driver which actually modifies error handling behavior. Drivers which override ->error_handler just wraps the standard error handler only to prepare the controller for EH. I don't think making ops layering strict has any noticeable benefit. This patch makes ->prereset, ->softreset, ->hardreset, ->postreset and their PMP counterparts propoer ops. Default ops are provided in the base ops tables and drivers are converted to override individual reset methods instead of creating custom error_handler. * ata_std_error_handler() doesn't use sata_std_hardreset() if SCRs aren't accessible. sata_promise doesn't need to use separate error_handlers for PATA and SATA anymore. * softreset is broken for sata_inic162x and sata_sx4. As libata now always prefers hardreset, this doesn't really matter but the ops are forced to NULL using ATA_OP_NULL for documentation purpose. * pata_hpt374 needs to use different prereset for the first and second PCI functions. This used to be done by branching from hpt374_error_handler(). The proper way to do this is to use separate ops and port_info tables for each function. Converted. Signed-off-by: Tejun Heo <htejun@gmail.com>
241 lines
6.3 KiB
C
241 lines
6.3 KiB
C
/*
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* pata_triflex.c - Compaq PATA for new ATA layer
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* (C) 2005 Red Hat Inc
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* Alan Cox <alan@redhat.com>
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*
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* based upon
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*
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* triflex.c
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*
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* IDE Chipset driver for the Compaq TriFlex IDE controller.
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*
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* Known to work with the Compaq Workstation 5x00 series.
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*
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* Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
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* Author: Torben Mathiasen <torben.mathiasen@hp.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Loosely based on the piix & svwks drivers.
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*
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* Documentation:
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* Not publically available.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <scsi/scsi_host.h>
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#include <linux/libata.h>
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#define DRV_NAME "pata_triflex"
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#define DRV_VERSION "0.2.8"
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/**
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* triflex_prereset - probe begin
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* @link: ATA link
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* @deadline: deadline jiffies for the operation
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*
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* Set up cable type and use generic probe init
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*/
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static int triflex_prereset(struct ata_link *link, unsigned long deadline)
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{
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static const struct pci_bits triflex_enable_bits[] = {
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{ 0x80, 1, 0x01, 0x01 },
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{ 0x80, 1, 0x02, 0x02 }
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};
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struct ata_port *ap = link->ap;
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
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return -ENOENT;
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return ata_std_prereset(link, deadline);
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}
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/**
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* triflex_load_timing - timing configuration
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* @ap: ATA interface
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* @adev: Device on the bus
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* @speed: speed to configure
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*
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* The Triflex has one set of timings per device per channel. This
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* means we must do some switching. As the PIO and DMA timings don't
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* match we have to do some reloading unlike PIIX devices where tuning
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* tricks can avoid it.
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*/
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static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
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{
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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u32 timing = 0;
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u32 triflex_timing, old_triflex_timing;
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int channel_offset = ap->port_no ? 0x74: 0x70;
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unsigned int is_slave = (adev->devno != 0);
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pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
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triflex_timing = old_triflex_timing;
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switch(speed)
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{
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case XFER_MW_DMA_2:
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timing = 0x0103;break;
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case XFER_MW_DMA_1:
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timing = 0x0203;break;
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case XFER_MW_DMA_0:
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timing = 0x0808;break;
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case XFER_SW_DMA_2:
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case XFER_SW_DMA_1:
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case XFER_SW_DMA_0:
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timing = 0x0F0F;break;
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case XFER_PIO_4:
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timing = 0x0202;break;
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case XFER_PIO_3:
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timing = 0x0204;break;
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case XFER_PIO_2:
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timing = 0x0404;break;
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case XFER_PIO_1:
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timing = 0x0508;break;
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case XFER_PIO_0:
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timing = 0x0808;break;
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default:
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BUG();
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}
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triflex_timing &= ~ (0xFFFF << (16 * is_slave));
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triflex_timing |= (timing << (16 * is_slave));
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if (triflex_timing != old_triflex_timing)
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pci_write_config_dword(pdev, channel_offset, triflex_timing);
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}
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/**
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* triflex_set_piomode - set initial PIO mode data
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* @ap: ATA interface
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* @adev: ATA device
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*
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* Use the timing loader to set up the PIO mode. We have to do this
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* because DMA start/stop will only be called once DMA occurs. If there
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* has been no DMA then the PIO timings are still needed.
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*/
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static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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triflex_load_timing(ap, adev, adev->pio_mode);
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}
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/**
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* triflex_dma_start - DMA start callback
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* @qc: Command in progress
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*
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* Usually drivers set the DMA timing at the point the set_dmamode call
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* is made. Triflex however requires we load new timings on the
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* transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
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* We load the DMA timings just before starting DMA and then restore
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* the PIO timing when the DMA is finished.
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*/
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static void triflex_bmdma_start(struct ata_queued_cmd *qc)
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{
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triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
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ata_bmdma_start(qc);
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}
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/**
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* triflex_dma_stop - DMA stop callback
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* @ap: ATA interface
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* @adev: ATA device
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*
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* We loaded new timings in dma_start, as a result we need to restore
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* the PIO timings in dma_stop so that the next command issue gets the
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* right clock values.
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*/
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static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
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{
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ata_bmdma_stop(qc);
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triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
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}
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static struct scsi_host_template triflex_sht = {
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ATA_BMDMA_SHT(DRV_NAME),
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};
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static struct ata_port_operations triflex_port_ops = {
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.inherits = &ata_bmdma_port_ops,
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.bmdma_start = triflex_bmdma_start,
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.bmdma_stop = triflex_bmdma_stop,
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.cable_detect = ata_cable_40wire,
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.set_piomode = triflex_set_piomode,
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.prereset = triflex_prereset,
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};
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static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
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{
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static const struct ata_port_info info = {
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.flags = ATA_FLAG_SLAVE_POSS,
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.pio_mask = 0x1f,
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.mwdma_mask = 0x07,
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.port_ops = &triflex_port_ops
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};
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const struct ata_port_info *ppi[] = { &info, NULL };
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static int printed_version;
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if (!printed_version++)
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dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
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return ata_pci_init_one(dev, ppi, &triflex_sht, NULL);
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}
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static const struct pci_device_id triflex[] = {
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{ PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
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{ },
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};
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static struct pci_driver triflex_pci_driver = {
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.name = DRV_NAME,
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.id_table = triflex,
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.probe = triflex_init_one,
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.remove = ata_pci_remove_one,
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#ifdef CONFIG_PM
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.suspend = ata_pci_device_suspend,
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.resume = ata_pci_device_resume,
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#endif
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};
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static int __init triflex_init(void)
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{
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return pci_register_driver(&triflex_pci_driver);
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}
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static void __exit triflex_exit(void)
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{
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pci_unregister_driver(&triflex_pci_driver);
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}
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, triflex);
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MODULE_VERSION(DRV_VERSION);
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module_init(triflex_init);
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module_exit(triflex_exit);
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