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256 lines
6.5 KiB
256 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* New ATA layer SC1200 driver Alan Cox <[email protected]> |
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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 <[email protected]> |
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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_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 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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