410 lines
11 KiB
C
410 lines
11 KiB
C
/*
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* pata_sil680.c - SIL680 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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* linux/drivers/ide/pci/siimage.c Version 1.07 Nov 30, 2003
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*
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* Copyright (C) 2001-2002 Andre Hedrick <andre@linux-ide.org>
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* Copyright (C) 2003 Red Hat <alan@redhat.com>
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*
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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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* Documentation publically available.
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*
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* If you have strange problems with nVidia chipset systems please
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* see the SI support documentation and update your system BIOS
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* if neccessary
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*
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* TODO
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* If we know all our devices are LBA28 (or LBA28 sized) we could use
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* the command fifo mode.
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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_sil680"
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#define DRV_VERSION "0.4.1"
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/**
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* sil680_selreg - return register base
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* @hwif: interface
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* @r: config offset
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*
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* Turn a config register offset into the right address in either
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* PCI space or MMIO space to access the control register in question
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* Thankfully this is a configuration operation so isnt performance
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* criticial.
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*/
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static unsigned long sil680_selreg(struct ata_port *ap, int r)
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{
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unsigned long base = 0xA0 + r;
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base += (ap->port_no << 4);
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return base;
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}
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/**
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* sil680_seldev - return register base
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* @hwif: interface
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* @r: config offset
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*
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* Turn a config register offset into the right address in either
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* PCI space or MMIO space to access the control register in question
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* including accounting for the unit shift.
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*/
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static unsigned long sil680_seldev(struct ata_port *ap, struct ata_device *adev, int r)
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{
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unsigned long base = 0xA0 + r;
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base += (ap->port_no << 4);
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base |= adev->devno ? 2 : 0;
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return base;
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}
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/**
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* sil680_cable_detect - cable detection
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* @ap: ATA port
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*
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* Perform cable detection. The SIL680 stores this in PCI config
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* space for us.
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*/
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static int sil680_cable_detect(struct ata_port *ap) {
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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unsigned long addr = sil680_selreg(ap, 0);
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u8 ata66;
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pci_read_config_byte(pdev, addr, &ata66);
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if (ata66 & 1)
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return ATA_CBL_PATA80;
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else
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return ATA_CBL_PATA40;
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}
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static int sil680_pre_reset(struct ata_port *ap)
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{
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ap->cbl = sil680_cable_detect(ap);
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return ata_std_prereset(ap);
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}
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/**
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* sil680_bus_reset - reset the SIL680 bus
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* @ap: ATA port to reset
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*
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* Perform the SIL680 housekeeping when doing an ATA bus reset
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*/
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static int sil680_bus_reset(struct ata_port *ap,unsigned int *classes)
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{
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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unsigned long addr = sil680_selreg(ap, 0);
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u8 reset;
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pci_read_config_byte(pdev, addr, &reset);
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pci_write_config_byte(pdev, addr, reset | 0x03);
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udelay(25);
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pci_write_config_byte(pdev, addr, reset);
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return ata_std_softreset(ap, classes);
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}
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static void sil680_error_handler(struct ata_port *ap)
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{
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ata_bmdma_drive_eh(ap, sil680_pre_reset, sil680_bus_reset, NULL, ata_std_postreset);
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}
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/**
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* sil680_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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* Program the SIL680 registers for PIO mode. Note that the task speed
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* registers are shared between the devices so we must pick the lowest
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* mode for command work.
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*/
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static void sil680_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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static u16 speed_p[5] = { 0x328A, 0x2283, 0x1104, 0x10C3, 0x10C1 };
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static u16 speed_t[5] = { 0x328A, 0x1281, 0x1281, 0x10C3, 0x10C1 };
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unsigned long tfaddr = sil680_selreg(ap, 0x02);
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unsigned long addr = sil680_seldev(ap, adev, 0x04);
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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int pio = adev->pio_mode - XFER_PIO_0;
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int lowest_pio = pio;
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u16 reg;
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struct ata_device *pair = ata_dev_pair(adev);
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if (pair != NULL && adev->pio_mode > pair->pio_mode)
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lowest_pio = pair->pio_mode - XFER_PIO_0;
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pci_write_config_word(pdev, addr, speed_p[pio]);
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pci_write_config_word(pdev, tfaddr, speed_t[lowest_pio]);
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pci_read_config_word(pdev, tfaddr-2, ®);
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reg &= ~0x0200; /* Clear IORDY */
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if (ata_pio_need_iordy(adev))
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reg |= 0x0200; /* Enable IORDY */
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pci_write_config_word(pdev, tfaddr-2, reg);
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}
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/**
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* sil680_set_dmamode - set initial DMA mode data
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* @ap: ATA interface
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* @adev: ATA device
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*
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* Program the MWDMA/UDMA modes for the sil680 k
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* chipset. The MWDMA mode values are pulled from a lookup table
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* while the chipset uses mode number for UDMA.
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*/
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static void sil680_set_dmamode(struct ata_port *ap, struct ata_device *adev)
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{
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static u8 ultra_table[2][7] = {
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{ 0x0C, 0x07, 0x05, 0x04, 0x02, 0x01, 0xFF }, /* 100MHz */
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{ 0x0F, 0x0B, 0x07, 0x05, 0x03, 0x02, 0x01 }, /* 133Mhz */
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};
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static u16 dma_table[3] = { 0x2208, 0x10C2, 0x10C1 };
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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unsigned long ma = sil680_seldev(ap, adev, 0x08);
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unsigned long ua = sil680_seldev(ap, adev, 0x0C);
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unsigned long addr_mask = 0x80 + 4 * ap->port_no;
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int port_shift = adev->devno * 4;
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u8 scsc, mode;
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u16 multi, ultra;
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pci_read_config_byte(pdev, 0x8A, &scsc);
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pci_read_config_byte(pdev, addr_mask, &mode);
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pci_read_config_word(pdev, ma, &multi);
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pci_read_config_word(pdev, ua, &ultra);
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/* Mask timing bits */
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ultra &= ~0x3F;
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mode &= ~(0x03 << port_shift);
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/* Extract scsc */
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scsc = (scsc & 0x30) ? 1: 0;
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if (adev->dma_mode >= XFER_UDMA_0) {
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multi = 0x10C1;
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ultra |= ultra_table[scsc][adev->dma_mode - XFER_UDMA_0];
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mode |= (0x03 << port_shift);
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} else {
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multi = dma_table[adev->dma_mode - XFER_MW_DMA_0];
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mode |= (0x02 << port_shift);
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}
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pci_write_config_byte(pdev, addr_mask, mode);
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pci_write_config_word(pdev, ma, multi);
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pci_write_config_word(pdev, ua, ultra);
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}
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static struct scsi_host_template sil680_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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.max_sectors = ATA_MAX_SECTORS,
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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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};
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static struct ata_port_operations sil680_port_ops = {
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.port_disable = ata_port_disable,
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.set_piomode = sil680_set_piomode,
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.set_dmamode = sil680_set_dmamode,
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.mode_filter = ata_pci_default_filter,
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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 = sil680_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_pio_data_xfer,
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.irq_handler = ata_interrupt,
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.irq_clear = ata_bmdma_irq_clear,
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.port_start = ata_port_start,
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.port_stop = ata_port_stop,
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.host_stop = ata_host_stop
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};
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/**
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* sil680_init_chip - chip setup
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* @pdev: PCI device
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*
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* Perform all the chip setup which must be done both when the device
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* is powered up on boot and when we resume in case we resumed from RAM.
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* Returns the final clock settings.
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*/
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static u8 sil680_init_chip(struct pci_dev *pdev)
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{
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u32 class_rev = 0;
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u8 tmpbyte = 0;
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pci_read_config_dword(pdev, PCI_CLASS_REVISION, &class_rev);
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class_rev &= 0xff;
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/* FIXME: double check */
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pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, (class_rev) ? 1 : 255);
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pci_write_config_byte(pdev, 0x80, 0x00);
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pci_write_config_byte(pdev, 0x84, 0x00);
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pci_read_config_byte(pdev, 0x8A, &tmpbyte);
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printk(KERN_INFO "sil680: BA5_EN = %d clock = %02X\n",
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tmpbyte & 1, tmpbyte & 0x30);
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switch(tmpbyte & 0x30) {
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case 0x00:
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/* 133 clock attempt to force it on */
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pci_write_config_byte(pdev, 0x8A, tmpbyte|0x10);
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break;
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case 0x30:
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/* if clocking is disabled */
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/* 133 clock attempt to force it on */
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pci_write_config_byte(pdev, 0x8A, tmpbyte & ~0x20);
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break;
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case 0x10:
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/* 133 already */
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break;
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case 0x20:
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/* BIOS set PCI x2 clocking */
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break;
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}
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pci_read_config_byte(pdev, 0x8A, &tmpbyte);
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printk(KERN_INFO "sil680: BA5_EN = %d clock = %02X\n",
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tmpbyte & 1, tmpbyte & 0x30);
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pci_write_config_byte(pdev, 0xA1, 0x72);
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pci_write_config_word(pdev, 0xA2, 0x328A);
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pci_write_config_dword(pdev, 0xA4, 0x62DD62DD);
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pci_write_config_dword(pdev, 0xA8, 0x43924392);
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pci_write_config_dword(pdev, 0xAC, 0x40094009);
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pci_write_config_byte(pdev, 0xB1, 0x72);
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pci_write_config_word(pdev, 0xB2, 0x328A);
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pci_write_config_dword(pdev, 0xB4, 0x62DD62DD);
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pci_write_config_dword(pdev, 0xB8, 0x43924392);
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pci_write_config_dword(pdev, 0xBC, 0x40094009);
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switch(tmpbyte & 0x30) {
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case 0x00: printk(KERN_INFO "sil680: 100MHz clock.\n");break;
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case 0x10: printk(KERN_INFO "sil680: 133MHz clock.\n");break;
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case 0x20: printk(KERN_INFO "sil680: Using PCI clock.\n");break;
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/* This last case is _NOT_ ok */
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case 0x30: printk(KERN_ERR "sil680: Clock disabled ?\n");
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}
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return tmpbyte & 0x30;
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}
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static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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static struct ata_port_info info = {
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.sht = &sil680_sht,
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.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
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.pio_mask = 0x1f,
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.mwdma_mask = 0x07,
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.udma_mask = 0x7f,
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.port_ops = &sil680_port_ops
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};
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static struct ata_port_info info_slow = {
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.sht = &sil680_sht,
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.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
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.pio_mask = 0x1f,
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.mwdma_mask = 0x07,
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.udma_mask = 0x3f,
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.port_ops = &sil680_port_ops
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};
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static struct ata_port_info *port_info[2] = {&info, &info};
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static int printed_version;
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if (!printed_version++)
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dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
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switch(sil680_init_chip(pdev))
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{
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case 0:
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port_info[0] = port_info[1] = &info_slow;
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break;
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case 0x30:
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return -ENODEV;
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}
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return ata_pci_init_one(pdev, port_info, 2);
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}
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static int sil680_reinit_one(struct pci_dev *pdev)
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{
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sil680_init_chip(pdev);
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return ata_pci_device_resume(pdev);
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}
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static const struct pci_device_id sil680[] = {
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{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },
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{ },
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};
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static struct pci_driver sil680_pci_driver = {
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.name = DRV_NAME,
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.id_table = sil680,
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.probe = sil680_init_one,
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.remove = ata_pci_remove_one,
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.suspend = ata_pci_device_suspend,
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.resume = sil680_reinit_one,
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};
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static int __init sil680_init(void)
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{
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return pci_register_driver(&sil680_pci_driver);
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}
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static void __exit sil680_exit(void)
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{
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pci_unregister_driver(&sil680_pci_driver);
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}
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("low-level driver for SI680 PATA");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, sil680);
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MODULE_VERSION(DRV_VERSION);
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module_init(sil680_init);
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module_exit(sil680_exit);
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