362 строки
9.4 KiB
C
362 строки
9.4 KiB
C
/*
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* IDE tuning and bus mastering support for the CS5510/CS5520
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* chipsets
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*
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* The CS5510/CS5520 are slightly unusual devices. Unlike the
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* typical IDE controllers they do bus mastering with the drive in
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* PIO mode and smarter silicon.
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*
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* The practical upshot of this is that we must always tune the
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* drive for the right PIO mode. We must also ignore all the blacklists
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* and the drive bus mastering DMA information. Also to confuse matters
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* further we can do DMA on PIO only drives.
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*
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* DMA on the 5510 also requires we disable_hlt() during DMA on early
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* revisions.
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*
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* *** This driver is strictly experimental ***
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*
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* (c) Copyright Red Hat Inc 2002
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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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_cs5520"
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#define DRV_VERSION "0.6.6"
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struct pio_clocks
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{
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int address;
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int assert;
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int recovery;
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};
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static const struct pio_clocks cs5520_pio_clocks[]={
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{3, 6, 11},
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{2, 5, 6},
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{1, 4, 3},
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{1, 3, 2},
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{1, 2, 1}
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};
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/**
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* cs5520_set_timings - program PIO timings
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* @ap: ATA port
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* @adev: ATA device
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*
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* Program the PIO mode timings for the controller according to the pio
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* clocking table.
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*/
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static void cs5520_set_timings(struct ata_port *ap, struct ata_device *adev, int pio)
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{
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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int slave = adev->devno;
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pio -= XFER_PIO_0;
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/* Channel command timing */
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pci_write_config_byte(pdev, 0x62 + ap->port_no,
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(cs5520_pio_clocks[pio].recovery << 4) |
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(cs5520_pio_clocks[pio].assert));
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/* FIXME: should these use address ? */
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/* Read command timing */
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pci_write_config_byte(pdev, 0x64 + 4*ap->port_no + slave,
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(cs5520_pio_clocks[pio].recovery << 4) |
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(cs5520_pio_clocks[pio].assert));
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/* Write command timing */
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pci_write_config_byte(pdev, 0x66 + 4*ap->port_no + slave,
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(cs5520_pio_clocks[pio].recovery << 4) |
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(cs5520_pio_clocks[pio].assert));
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}
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/**
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* cs5520_enable_dma - turn on DMA bits
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*
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* Turn on the DMA bits for this disk. Needed because the BIOS probably
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* has not done the work for us. Belongs in the core SATA code.
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*/
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static void cs5520_enable_dma(struct ata_port *ap, struct ata_device *adev)
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{
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/* Set the DMA enable/disable flag */
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u8 reg = ioread8(ap->ioaddr.bmdma_addr + 0x02);
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reg |= 1<<(adev->devno + 5);
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iowrite8(reg, ap->ioaddr.bmdma_addr + 0x02);
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}
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/**
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* cs5520_set_dmamode - program DMA timings
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* @ap: ATA port
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* @adev: ATA device
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*
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* Program the DMA mode timings for the controller according to the pio
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* clocking table. Note that this device sets the DMA timings to PIO
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* mode values. This may seem bizarre but the 5520 architecture talks
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* PIO mode to the disk and DMA mode to the controller so the underlying
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* transfers are PIO timed.
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*/
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static void cs5520_set_dmamode(struct ata_port *ap, struct ata_device *adev)
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{
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static const int dma_xlate[3] = { XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 };
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cs5520_set_timings(ap, adev, dma_xlate[adev->dma_mode]);
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cs5520_enable_dma(ap, adev);
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}
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/**
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* cs5520_set_piomode - program PIO timings
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* @ap: ATA port
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* @adev: ATA device
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*
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* Program the PIO mode timings for the controller according to the pio
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* clocking table. We know pio_mode will equal dma_mode because of the
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* CS5520 architecture. At least once we turned DMA on and wrote a
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* mode setter.
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*/
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static void cs5520_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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cs5520_set_timings(ap, adev, adev->pio_mode);
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}
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static struct scsi_host_template cs5520_sht = {
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ATA_BMDMA_SHT(DRV_NAME),
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.sg_tablesize = LIBATA_DUMB_MAX_PRD,
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};
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static struct ata_port_operations cs5520_port_ops = {
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.inherits = &ata_bmdma_port_ops,
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.qc_prep = ata_sff_dumb_qc_prep,
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.cable_detect = ata_cable_40wire,
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.set_piomode = cs5520_set_piomode,
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.set_dmamode = cs5520_set_dmamode,
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};
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static int __devinit cs5520_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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static const unsigned int cmd_port[] = { 0x1F0, 0x170 };
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static const unsigned int ctl_port[] = { 0x3F6, 0x376 };
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struct ata_port_info pi = {
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.flags = ATA_FLAG_SLAVE_POSS,
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.pio_mask = ATA_PIO4,
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.port_ops = &cs5520_port_ops,
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};
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const struct ata_port_info *ppi[2];
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u8 pcicfg;
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void __iomem *iomap[5];
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struct ata_host *host;
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struct ata_ioports *ioaddr;
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int i, rc;
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rc = pcim_enable_device(pdev);
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if (rc)
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return rc;
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/* IDE port enable bits */
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pci_read_config_byte(pdev, 0x60, &pcicfg);
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/* Check if the ATA ports are enabled */
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if ((pcicfg & 3) == 0)
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return -ENODEV;
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ppi[0] = ppi[1] = &ata_dummy_port_info;
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if (pcicfg & 1)
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ppi[0] = π
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if (pcicfg & 2)
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ppi[1] = π
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if ((pcicfg & 0x40) == 0) {
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dev_printk(KERN_WARNING, &pdev->dev,
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"DMA mode disabled. Enabling.\n");
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pci_write_config_byte(pdev, 0x60, pcicfg | 0x40);
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}
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pi.mwdma_mask = id->driver_data;
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host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
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if (!host)
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return -ENOMEM;
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/* Perform set up for DMA */
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if (pci_enable_device_io(pdev)) {
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printk(KERN_ERR DRV_NAME ": unable to configure BAR2.\n");
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return -ENODEV;
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}
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if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
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printk(KERN_ERR DRV_NAME ": unable to configure DMA mask.\n");
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return -ENODEV;
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}
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if (pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK)) {
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printk(KERN_ERR DRV_NAME ": unable to configure consistent DMA mask.\n");
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return -ENODEV;
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}
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/* Map IO ports and initialize host accordingly */
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iomap[0] = devm_ioport_map(&pdev->dev, cmd_port[0], 8);
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iomap[1] = devm_ioport_map(&pdev->dev, ctl_port[0], 1);
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iomap[2] = devm_ioport_map(&pdev->dev, cmd_port[1], 8);
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iomap[3] = devm_ioport_map(&pdev->dev, ctl_port[1], 1);
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iomap[4] = pcim_iomap(pdev, 2, 0);
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if (!iomap[0] || !iomap[1] || !iomap[2] || !iomap[3] || !iomap[4])
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return -ENOMEM;
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ioaddr = &host->ports[0]->ioaddr;
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ioaddr->cmd_addr = iomap[0];
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ioaddr->ctl_addr = iomap[1];
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ioaddr->altstatus_addr = iomap[1];
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ioaddr->bmdma_addr = iomap[4];
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ata_sff_std_ports(ioaddr);
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ata_port_desc(host->ports[0],
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"cmd 0x%x ctl 0x%x", cmd_port[0], ctl_port[0]);
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ata_port_pbar_desc(host->ports[0], 4, 0, "bmdma");
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ioaddr = &host->ports[1]->ioaddr;
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ioaddr->cmd_addr = iomap[2];
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ioaddr->ctl_addr = iomap[3];
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ioaddr->altstatus_addr = iomap[3];
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ioaddr->bmdma_addr = iomap[4] + 8;
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ata_sff_std_ports(ioaddr);
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ata_port_desc(host->ports[1],
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"cmd 0x%x ctl 0x%x", cmd_port[1], ctl_port[1]);
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ata_port_pbar_desc(host->ports[1], 4, 8, "bmdma");
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/* activate the host */
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pci_set_master(pdev);
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rc = ata_host_start(host);
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if (rc)
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return rc;
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for (i = 0; i < 2; i++) {
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static const int irq[] = { 14, 15 };
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struct ata_port *ap = host->ports[i];
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if (ata_port_is_dummy(ap))
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continue;
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rc = devm_request_irq(&pdev->dev, irq[ap->port_no],
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ata_sff_interrupt, 0, DRV_NAME, host);
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if (rc)
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return rc;
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ata_port_desc(ap, "irq %d", irq[i]);
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}
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return ata_host_register(host, &cs5520_sht);
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}
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#ifdef CONFIG_PM
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/**
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* cs5520_reinit_one - device resume
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* @pdev: PCI device
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*
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* Do any reconfiguration work needed by a resume from RAM. We need
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* to restore DMA mode support on BIOSen which disabled it
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*/
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static int cs5520_reinit_one(struct pci_dev *pdev)
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{
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struct ata_host *host = dev_get_drvdata(&pdev->dev);
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u8 pcicfg;
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int rc;
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rc = ata_pci_device_do_resume(pdev);
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if (rc)
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return rc;
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pci_read_config_byte(pdev, 0x60, &pcicfg);
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if ((pcicfg & 0x40) == 0)
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pci_write_config_byte(pdev, 0x60, pcicfg | 0x40);
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ata_host_resume(host);
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return 0;
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}
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/**
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* cs5520_pci_device_suspend - device suspend
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* @pdev: PCI device
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*
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* We have to cut and waste bits from the standard method because
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* the 5520 is a bit odd and not just a pure ATA device. As a result
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* we must not disable it. The needed code is short and this avoids
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* chip specific mess in the core code.
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*/
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static int cs5520_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
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{
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struct ata_host *host = dev_get_drvdata(&pdev->dev);
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int rc = 0;
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rc = ata_host_suspend(host, mesg);
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if (rc)
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return rc;
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pci_save_state(pdev);
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return 0;
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}
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#endif /* CONFIG_PM */
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/* For now keep DMA off. We can set it for all but A rev CS5510 once the
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core ATA code can handle it */
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static const struct pci_device_id pata_cs5520[] = {
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{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), },
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{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), },
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{ },
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};
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static struct pci_driver cs5520_pci_driver = {
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.name = DRV_NAME,
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.id_table = pata_cs5520,
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.probe = cs5520_init_one,
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.remove = ata_pci_remove_one,
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#ifdef CONFIG_PM
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.suspend = cs5520_pci_device_suspend,
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.resume = cs5520_reinit_one,
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#endif
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};
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static int __init cs5520_init(void)
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{
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return pci_register_driver(&cs5520_pci_driver);
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}
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static void __exit cs5520_exit(void)
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{
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pci_unregister_driver(&cs5520_pci_driver);
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}
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("low-level driver for Cyrix CS5510/5520");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, pata_cs5520);
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MODULE_VERSION(DRV_VERSION);
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module_init(cs5520_init);
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module_exit(cs5520_exit);
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