258 lines
6.6 KiB
C
258 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* New ATA layer SC1200 driver Alan Cox <alan@lxorguk.ukuu.org.uk>
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*
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* TODO: Mode selection filtering
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* TODO: Needs custom DMA cleanup code
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*
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* Based very heavily on
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*
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* linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003
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*
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* Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
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* May be copied or modified under the terms of the GNU General Public License
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*
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* Development of this chipset driver was funded
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* by the nice folks at National Semiconductor.
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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/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_sc1200"
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#define DRV_VERSION "0.2.6"
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#define SC1200_REV_A 0x00
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#define SC1200_REV_B1 0x01
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#define SC1200_REV_B3 0x02
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#define SC1200_REV_C1 0x03
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#define SC1200_REV_D1 0x04
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/**
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* sc1200_clock - PCI clock
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*
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* Return the PCI bus clocking for the SC1200 chipset configuration
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* in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
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*/
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static int sc1200_clock(void)
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{
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/* Magic registers that give us the chipset data */
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u8 chip_id = inb(0x903C);
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u8 silicon_rev = inb(0x903D);
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u16 pci_clock;
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if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
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return 0; /* 33 MHz mode */
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/* Clock generator configuration 0x901E its 8/9 are the PCI clocking
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0/3 is 33Mhz 1 is 48 2 is 66 */
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pci_clock = inw(0x901E);
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pci_clock >>= 8;
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pci_clock &= 0x03;
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if (pci_clock == 3)
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pci_clock = 0;
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return pci_clock;
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}
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/**
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* sc1200_set_piomode - PIO setup
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* @ap: ATA interface
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* @adev: device on the interface
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*
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* Set our PIO requirements. This is fairly simple on the SC1200
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*/
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static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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static const u32 pio_timings[4][5] = {
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/* format0, 33Mhz */
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{ 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 },
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/* format1, 33Mhz */
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{ 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 },
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/* format1, 48Mhz */
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{ 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 },
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/* format1, 66Mhz */
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{ 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 }
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};
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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u32 format;
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unsigned int reg = 0x40 + 0x10 * ap->port_no;
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int mode = adev->pio_mode - XFER_PIO_0;
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pci_read_config_dword(pdev, reg + 4, &format);
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format >>= 31;
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format += sc1200_clock();
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pci_write_config_dword(pdev, reg + 8 * adev->devno,
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pio_timings[format][mode]);
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}
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/**
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* sc1200_set_dmamode - DMA timing setup
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* @ap: ATA interface
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* @adev: Device being configured
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*
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* We cannot mix MWDMA and UDMA without reloading timings each switch
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* master to slave.
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*/
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static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
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{
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static const u32 udma_timing[3][3] = {
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{ 0x00921250, 0x00911140, 0x00911030 },
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{ 0x00932470, 0x00922260, 0x00922140 },
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{ 0x009436A1, 0x00933481, 0x00923261 }
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};
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static const u32 mwdma_timing[3][3] = {
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{ 0x00077771, 0x00012121, 0x00002020 },
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{ 0x000BBBB2, 0x00024241, 0x00013131 },
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{ 0x000FFFF3, 0x00035352, 0x00015151 }
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};
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int clock = sc1200_clock();
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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unsigned int reg = 0x40 + 0x10 * ap->port_no;
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int mode = adev->dma_mode;
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u32 format;
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if (mode >= XFER_UDMA_0)
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format = udma_timing[clock][mode - XFER_UDMA_0];
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else
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format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
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if (adev->devno == 0) {
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u32 timings;
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pci_read_config_dword(pdev, reg + 4, &timings);
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timings &= 0x80000000UL;
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timings |= format;
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pci_write_config_dword(pdev, reg + 4, timings);
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} else
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pci_write_config_dword(pdev, reg + 12, format);
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}
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/**
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* sc1200_qc_issue - command issue
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* @qc: command pending
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*
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* Called when the libata layer is about to issue a command. We wrap
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* this interface so that we can load the correct ATA timings if
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* necessary. Specifically we have a problem that there is only
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* one MWDMA/UDMA bit.
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*/
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static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
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{
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struct ata_port *ap = qc->ap;
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struct ata_device *adev = qc->dev;
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struct ata_device *prev = ap->private_data;
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/* See if the DMA settings could be wrong */
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if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
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/* Maybe, but do the channels match MWDMA/UDMA ? */
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if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
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(ata_using_udma(prev) && !ata_using_udma(adev)))
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/* Switch the mode bits */
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sc1200_set_dmamode(ap, adev);
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}
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return ata_bmdma_qc_issue(qc);
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}
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/**
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* sc1200_qc_defer - implement serialization
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* @qc: command
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*
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* Serialize command issue on this controller.
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*/
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static int sc1200_qc_defer(struct ata_queued_cmd *qc)
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{
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struct ata_host *host = qc->ap->host;
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struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
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int rc;
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/* First apply the usual rules */
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rc = ata_std_qc_defer(qc);
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if (rc != 0)
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return rc;
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/* Now apply serialization rules. Only allow a command if the
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other channel state machine is idle */
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if (alt && alt->qc_active)
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return ATA_DEFER_PORT;
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return 0;
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}
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static struct scsi_host_template sc1200_sht = {
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ATA_BASE_SHT(DRV_NAME),
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.sg_tablesize = LIBATA_DUMB_MAX_PRD,
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.dma_boundary = ATA_DMA_BOUNDARY,
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};
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static struct ata_port_operations sc1200_port_ops = {
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.inherits = &ata_bmdma_port_ops,
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.qc_prep = ata_bmdma_dumb_qc_prep,
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.qc_issue = sc1200_qc_issue,
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.qc_defer = sc1200_qc_defer,
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.cable_detect = ata_cable_40wire,
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.set_piomode = sc1200_set_piomode,
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.set_dmamode = sc1200_set_dmamode,
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};
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/**
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* sc1200_init_one - Initialise an SC1200
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* @dev: PCI device
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* @id: Entry in match table
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*
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* Just throw the needed data at the libata helper and it does all
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* our work.
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*/
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static int sc1200_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 = ATA_PIO4,
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.mwdma_mask = ATA_MWDMA2,
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.udma_mask = ATA_UDMA2,
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.port_ops = &sc1200_port_ops
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};
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const struct ata_port_info *ppi[] = { &info, NULL };
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return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
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}
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static const struct pci_device_id sc1200[] = {
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{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
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{ },
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};
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static struct pci_driver sc1200_pci_driver = {
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.name = DRV_NAME,
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.id_table = sc1200,
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.probe = sc1200_init_one,
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.remove = ata_pci_remove_one,
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#ifdef CONFIG_PM_SLEEP
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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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module_pci_driver(sc1200_pci_driver);
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MODULE_AUTHOR("Alan Cox, Mark Lord");
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MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, sc1200);
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MODULE_VERSION(DRV_VERSION);
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