029cfd6b74
libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
248 lines
6.5 KiB
C
248 lines
6.5 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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static void triflex_error_handler(struct ata_port *ap)
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{
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ata_bmdma_drive_eh(ap, triflex_prereset, ata_std_softreset, NULL, ata_std_postreset);
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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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.error_handler = triflex_error_handler,
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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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.sht = &triflex_sht,
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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);
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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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