395 lines
11 KiB
C
395 lines
11 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 "0.6.4"
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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 int cs5520_pre_reset(struct ata_port *ap)
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{
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ap->cbl = ATA_CBL_PATA40;
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return ata_std_prereset(ap);
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}
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static void cs5520_error_handler(struct ata_port *ap)
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{
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return ata_bmdma_drive_eh(ap, cs5520_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
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}
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static struct scsi_host_template cs5520_sht = {
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.module = THIS_MODULE,
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.name = DRV_NAME,
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.ioctl = ata_scsi_ioctl,
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.queuecommand = ata_scsi_queuecmd,
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.can_queue = ATA_DEF_QUEUE,
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.this_id = ATA_SHT_THIS_ID,
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.sg_tablesize = LIBATA_MAX_PRD,
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.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
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.emulated = ATA_SHT_EMULATED,
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.use_clustering = ATA_SHT_USE_CLUSTERING,
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.proc_name = DRV_NAME,
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.dma_boundary = ATA_DMA_BOUNDARY,
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.slave_configure = ata_scsi_slave_config,
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.slave_destroy = ata_scsi_slave_destroy,
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.bios_param = ata_std_bios_param,
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#ifdef CONFIG_PM
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.resume = ata_scsi_device_resume,
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.suspend = ata_scsi_device_suspend,
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#endif
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};
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static struct ata_port_operations cs5520_port_ops = {
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.port_disable = ata_port_disable,
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.set_piomode = cs5520_set_piomode,
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.set_dmamode = cs5520_set_dmamode,
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.tf_load = ata_tf_load,
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.tf_read = ata_tf_read,
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.check_status = ata_check_status,
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.exec_command = ata_exec_command,
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.dev_select = ata_std_dev_select,
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.freeze = ata_bmdma_freeze,
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.thaw = ata_bmdma_thaw,
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.error_handler = cs5520_error_handler,
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.post_internal_cmd = ata_bmdma_post_internal_cmd,
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.bmdma_setup = ata_bmdma_setup,
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.bmdma_start = ata_bmdma_start,
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.bmdma_stop = ata_bmdma_stop,
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.bmdma_status = ata_bmdma_status,
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.qc_prep = ata_qc_prep,
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.qc_issue = ata_qc_issue_prot,
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.data_xfer = ata_data_xfer,
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.irq_handler = ata_interrupt,
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.irq_clear = ata_bmdma_irq_clear,
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.irq_on = ata_irq_on,
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.irq_ack = ata_irq_ack,
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.port_start = ata_port_start,
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};
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static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
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{
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u8 pcicfg;
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void *iomap[5];
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static struct ata_probe_ent probe[2];
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int ports = 0;
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/* IDE port enable bits */
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pci_read_config_byte(dev, 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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if ((pcicfg & 0x40) == 0) {
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printk(KERN_WARNING DRV_NAME ": DMA mode disabled. Enabling.\n");
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pci_write_config_byte(dev, 0x60, pcicfg | 0x40);
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}
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/* Perform set up for DMA */
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if (pci_enable_device_bars(dev, 1<<2)) {
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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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pci_set_master(dev);
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if (pci_set_dma_mask(dev, 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(dev, 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 */
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iomap[0] = devm_ioport_map(&dev->dev, 0x1F0, 8);
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iomap[1] = devm_ioport_map(&dev->dev, 0x3F6, 1);
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iomap[2] = devm_ioport_map(&dev->dev, 0x170, 8);
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iomap[3] = devm_ioport_map(&dev->dev, 0x376, 1);
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iomap[4] = pcim_iomap(dev, 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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/* We have to do our own plumbing as the PCI setup for this
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chipset is non-standard so we can't punt to the libata code */
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INIT_LIST_HEAD(&probe[0].node);
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probe[0].dev = pci_dev_to_dev(dev);
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probe[0].port_ops = &cs5520_port_ops;
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probe[0].sht = &cs5520_sht;
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probe[0].pio_mask = 0x1F;
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probe[0].mwdma_mask = id->driver_data;
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probe[0].irq = 14;
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probe[0].irq_flags = 0;
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probe[0].port_flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST;
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probe[0].n_ports = 1;
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probe[0].port[0].cmd_addr = iomap[0];
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probe[0].port[0].ctl_addr = iomap[1];
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probe[0].port[0].altstatus_addr = iomap[1];
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probe[0].port[0].bmdma_addr = iomap[4];
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/* The secondary lurks at different addresses but is otherwise
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the same beastie */
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probe[1] = probe[0];
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INIT_LIST_HEAD(&probe[1].node);
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probe[1].irq = 15;
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probe[1].port[0].cmd_addr = iomap[2];
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probe[1].port[0].ctl_addr = iomap[3];
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probe[1].port[0].altstatus_addr = iomap[3];
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probe[1].port[0].bmdma_addr = iomap[4] + 8;
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/* Let libata fill in the port details */
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ata_std_ports(&probe[0].port[0]);
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ata_std_ports(&probe[1].port[0]);
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/* Now add the ports that are active */
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if (pcicfg & 1)
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ports += ata_device_add(&probe[0]);
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if (pcicfg & 2)
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ports += ata_device_add(&probe[1]);
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if (ports)
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return 0;
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return -ENODEV;
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}
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/**
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* cs5520_remove_one - device unload
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* @pdev: PCI device being removed
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*
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* Handle an unplug/unload event for a PCI device. Unload the
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* PCI driver but do not use the default handler as we manage
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* resources ourself and *MUST NOT* disable the device as it has
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* other functions.
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*/
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static void __devexit cs5520_remove_one(struct pci_dev *pdev)
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{
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struct device *dev = pci_dev_to_dev(pdev);
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struct ata_host *host = dev_get_drvdata(dev);
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ata_host_detach(host);
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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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u8 pcicfg;
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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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return ata_pci_device_resume(pdev);
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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 = cs5520_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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