300 lines
7.9 KiB
C
300 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* pata_it8213.c - iTE Tech. Inc. IT8213 PATA driver
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*
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* The IT8213 is a very Intel ICH like device for timing purposes, having
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* a similar register layout and the same split clock arrangement. Cable
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* detection is different, and it does not have slave channels or all the
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* clutter of later ICH/SATA setups.
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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 <linux/device.h>
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#include <scsi/scsi_host.h>
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#include <linux/libata.h>
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#include <linux/ata.h>
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#define DRV_NAME "pata_it8213"
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#define DRV_VERSION "0.0.3"
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/**
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* it8213_pre_reset - probe begin
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* @link: link
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* @deadline: deadline jiffies for the operation
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*
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* Filter out ports by the enable bits before doing the normal reset
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* and probe.
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*/
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static int it8213_pre_reset(struct ata_link *link, unsigned long deadline)
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{
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static const struct pci_bits it8213_enable_bits[] = {
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{ 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
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};
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struct ata_port *ap = link->ap;
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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if (!pci_test_config_bits(pdev, &it8213_enable_bits[ap->port_no]))
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return -ENOENT;
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return ata_sff_prereset(link, deadline);
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}
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/**
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* it8213_cable_detect - check for 40/80 pin
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* @ap: Port
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*
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* Perform cable detection for the 8213 ATA interface. This is
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* different to the PIIX arrangement
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*/
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static int it8213_cable_detect(struct ata_port *ap)
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{
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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u8 tmp;
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pci_read_config_byte(pdev, 0x42, &tmp);
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if (tmp & 2) /* The initial docs are incorrect */
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return ATA_CBL_PATA40;
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return ATA_CBL_PATA80;
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}
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/**
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* it8213_set_piomode - Initialize host controller PATA PIO timings
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* @ap: Port whose timings we are configuring
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* @adev: Device whose timings we are configuring
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*
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* Set PIO mode for device, in host controller PCI config space.
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*
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* LOCKING:
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* None (inherited from caller).
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*/
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static void it8213_set_piomode (struct ata_port *ap, struct ata_device *adev)
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{
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unsigned int pio = adev->pio_mode - XFER_PIO_0;
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struct pci_dev *dev = to_pci_dev(ap->host->dev);
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unsigned int master_port = ap->port_no ? 0x42 : 0x40;
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u16 master_data;
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int control = 0;
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/*
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* See Intel Document 298600-004 for the timing programing rules
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* for PIIX/ICH. The 8213 is a clone so very similar
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*/
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static const /* ISP RTC */
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u8 timings[][2] = { { 0, 0 },
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{ 0, 0 },
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{ 1, 0 },
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{ 2, 1 },
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{ 2, 3 }, };
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if (pio > 1)
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control |= 1; /* TIME */
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if (ata_pio_need_iordy(adev)) /* PIO 3/4 require IORDY */
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control |= 2; /* IE */
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/* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */
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if (adev->class != ATA_DEV_ATA)
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control |= 4; /* PPE */
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pci_read_config_word(dev, master_port, &master_data);
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/* Set PPE, IE, and TIME as appropriate */
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if (adev->devno == 0) {
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master_data &= 0xCCF0;
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master_data |= control;
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master_data |= (timings[pio][0] << 12) |
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(timings[pio][1] << 8);
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} else {
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u8 slave_data;
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master_data &= 0xFF0F;
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master_data |= (control << 4);
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/* Slave timing in separate register */
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pci_read_config_byte(dev, 0x44, &slave_data);
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slave_data &= 0xF0;
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slave_data |= (timings[pio][0] << 2) | timings[pio][1];
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pci_write_config_byte(dev, 0x44, slave_data);
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}
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master_data |= 0x4000; /* Ensure SITRE is set */
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pci_write_config_word(dev, master_port, master_data);
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}
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/**
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* it8213_set_dmamode - Initialize host controller PATA DMA timings
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* @ap: Port whose timings we are configuring
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* @adev: Device to program
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*
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* Set UDMA/MWDMA mode for device, in host controller PCI config space.
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* This device is basically an ICH alike.
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*
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* LOCKING:
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* None (inherited from caller).
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*/
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static void it8213_set_dmamode (struct ata_port *ap, struct ata_device *adev)
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{
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struct pci_dev *dev = to_pci_dev(ap->host->dev);
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u16 master_data;
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u8 speed = adev->dma_mode;
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int devid = adev->devno;
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u8 udma_enable;
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static const /* ISP RTC */
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u8 timings[][2] = { { 0, 0 },
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{ 0, 0 },
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{ 1, 0 },
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{ 2, 1 },
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{ 2, 3 }, };
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pci_read_config_word(dev, 0x40, &master_data);
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pci_read_config_byte(dev, 0x48, &udma_enable);
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if (speed >= XFER_UDMA_0) {
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unsigned int udma = adev->dma_mode - XFER_UDMA_0;
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u16 udma_timing;
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u16 ideconf;
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int u_clock, u_speed;
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/* Clocks follow the PIIX style */
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u_speed = min(2 - (udma & 1), udma);
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if (udma > 4)
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u_clock = 0x1000; /* 100Mhz */
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else if (udma > 2)
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u_clock = 1; /* 66Mhz */
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else
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u_clock = 0; /* 33Mhz */
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udma_enable |= (1 << devid);
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/* Load the UDMA cycle time */
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pci_read_config_word(dev, 0x4A, &udma_timing);
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udma_timing &= ~(3 << (4 * devid));
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udma_timing |= u_speed << (4 * devid);
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pci_write_config_word(dev, 0x4A, udma_timing);
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/* Load the clock selection */
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pci_read_config_word(dev, 0x54, &ideconf);
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ideconf &= ~(0x1001 << devid);
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ideconf |= u_clock << devid;
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pci_write_config_word(dev, 0x54, ideconf);
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} else {
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/*
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* MWDMA is driven by the PIO timings. We must also enable
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* IORDY unconditionally along with TIME1. PPE has already
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* been set when the PIO timing was set.
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*/
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unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
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unsigned int control;
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u8 slave_data;
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static const unsigned int needed_pio[3] = {
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XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
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};
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int pio = needed_pio[mwdma] - XFER_PIO_0;
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control = 3; /* IORDY|TIME1 */
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/* If the drive MWDMA is faster than it can do PIO then
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we must force PIO into PIO0 */
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if (adev->pio_mode < needed_pio[mwdma])
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/* Enable DMA timing only */
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control |= 8; /* PIO cycles in PIO0 */
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if (devid) { /* Slave */
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master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */
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master_data |= control << 4;
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pci_read_config_byte(dev, 0x44, &slave_data);
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slave_data &= 0xF0;
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/* Load the matching timing */
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slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
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pci_write_config_byte(dev, 0x44, slave_data);
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} else { /* Master */
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master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY
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and master timing bits */
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master_data |= control;
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master_data |=
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(timings[pio][0] << 12) |
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(timings[pio][1] << 8);
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}
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udma_enable &= ~(1 << devid);
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pci_write_config_word(dev, 0x40, master_data);
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}
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pci_write_config_byte(dev, 0x48, udma_enable);
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}
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static struct scsi_host_template it8213_sht = {
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ATA_BMDMA_SHT(DRV_NAME),
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};
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static struct ata_port_operations it8213_ops = {
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.inherits = &ata_bmdma_port_ops,
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.cable_detect = it8213_cable_detect,
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.set_piomode = it8213_set_piomode,
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.set_dmamode = it8213_set_dmamode,
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.prereset = it8213_pre_reset,
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};
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/**
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* it8213_init_one - Register 8213 ATA PCI device with kernel services
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* @pdev: PCI device to register
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* @ent: Entry in it8213_pci_tbl matching with @pdev
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*
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* Called from kernel PCI layer.
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*
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* LOCKING:
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* Inherited from PCI layer (may sleep).
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*
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* RETURNS:
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* Zero on success, or -ERRNO value.
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*/
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static int it8213_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
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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_MWDMA12_ONLY,
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.udma_mask = ATA_UDMA6,
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.port_ops = &it8213_ops,
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};
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/* Current IT8213 stuff is single port */
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const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
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ata_print_version_once(&pdev->dev, DRV_VERSION);
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return ata_pci_bmdma_init_one(pdev, ppi, &it8213_sht, NULL, 0);
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}
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static const struct pci_device_id it8213_pci_tbl[] = {
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{ PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), },
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{ } /* terminate list */
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};
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static struct pci_driver it8213_pci_driver = {
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.name = DRV_NAME,
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.id_table = it8213_pci_tbl,
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.probe = it8213_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(it8213_pci_driver);
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("SCSI low-level driver for the ITE 8213");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
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MODULE_VERSION(DRV_VERSION);
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