386 lines
10 KiB
C
386 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* pata_rdc - Driver for later RDC PATA controllers
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*
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* This is actually a driver for hardware meeting
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* INCITS 370-2004 (1510D): ATA Host Adapter Standards
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*
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* Based on ata_piix.
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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 <linux/gfp.h>
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#include <scsi/scsi_host.h>
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#include <linux/libata.h>
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#include <linux/dmi.h>
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#define DRV_NAME "pata_rdc"
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#define DRV_VERSION "0.01"
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struct rdc_host_priv {
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u32 saved_iocfg;
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};
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/**
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* rdc_pata_cable_detect - Probe host controller cable detect info
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* @ap: Port for which cable detect info is desired
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*
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* Read 80c cable indicator from ATA PCI device's PCI config
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* register. This register is normally set by firmware (BIOS).
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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 int rdc_pata_cable_detect(struct ata_port *ap)
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{
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struct rdc_host_priv *hpriv = ap->host->private_data;
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u8 mask;
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/* check BIOS cable detect results */
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mask = 0x30 << (2 * ap->port_no);
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if ((hpriv->saved_iocfg & mask) == 0)
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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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* rdc_pata_prereset - prereset for PATA host controller
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* @link: Target link
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* @deadline: deadline jiffies for the operation
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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 int rdc_pata_prereset(struct ata_link *link, unsigned long deadline)
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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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static const struct pci_bits rdc_enable_bits[] = {
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{ 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
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{ 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */
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};
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if (!pci_test_config_bits(pdev, &rdc_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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static DEFINE_SPINLOCK(rdc_lock);
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/**
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* rdc_set_piomode - Initialize host controller PATA PIO timings
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* @ap: Port whose timings we are configuring
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* @adev: um
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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 rdc_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 long flags;
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unsigned int is_slave = (adev->devno != 0);
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unsigned int master_port= ap->port_no ? 0x42 : 0x40;
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unsigned int slave_port = 0x44;
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u16 master_data;
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u8 slave_data;
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u8 udma_enable;
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int control = 0;
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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 >= 2)
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control |= 1; /* TIME1 enable */
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if (ata_pio_need_iordy(adev))
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control |= 2; /* IE enable */
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if (adev->class == ATA_DEV_ATA)
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control |= 4; /* PPE enable */
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spin_lock_irqsave(&rdc_lock, flags);
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/* PIO configuration clears DTE unconditionally. It will be
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* programmed in set_dmamode which is guaranteed to be called
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* after set_piomode if any DMA mode is available.
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*/
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pci_read_config_word(dev, master_port, &master_data);
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if (is_slave) {
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/* clear TIME1|IE1|PPE1|DTE1 */
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master_data &= 0xff0f;
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/* Enable SITRE (separate slave timing register) */
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master_data |= 0x4000;
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/* enable PPE1, IE1 and TIME1 as needed */
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master_data |= (control << 4);
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pci_read_config_byte(dev, slave_port, &slave_data);
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slave_data &= (ap->port_no ? 0x0f : 0xf0);
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/* Load the timing nibble for this slave */
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slave_data |= ((timings[pio][0] << 2) | timings[pio][1])
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<< (ap->port_no ? 4 : 0);
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} else {
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/* clear ISP|RCT|TIME0|IE0|PPE0|DTE0 */
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master_data &= 0xccf0;
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/* Enable PPE, IE and TIME as appropriate */
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master_data |= control;
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/* load ISP and RCT */
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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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pci_write_config_word(dev, master_port, master_data);
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if (is_slave)
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pci_write_config_byte(dev, slave_port, slave_data);
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/* Ensure the UDMA bit is off - it will be turned back on if
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UDMA is selected */
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pci_read_config_byte(dev, 0x48, &udma_enable);
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udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
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pci_write_config_byte(dev, 0x48, udma_enable);
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spin_unlock_irqrestore(&rdc_lock, flags);
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}
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/**
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* rdc_set_dmamode - Initialize host controller PATA PIO timings
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* @ap: Port whose timings we are configuring
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* @adev: Drive in question
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*
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* Set UDMA 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 rdc_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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unsigned long flags;
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u8 master_port = ap->port_no ? 0x42 : 0x40;
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u16 master_data;
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u8 speed = adev->dma_mode;
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int devid = adev->devno + 2 * ap->port_no;
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u8 udma_enable = 0;
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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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spin_lock_irqsave(&rdc_lock, flags);
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pci_read_config_word(dev, master_port, &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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/*
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* UDMA is handled by a combination of clock switching and
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* selection of dividers
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*
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* Handy rule: Odd modes are UDMATIMx 01, even are 02
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* except UDMA0 which is 00
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*/
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u_speed = min(2 - (udma & 1), udma);
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if (udma == 5)
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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 CT/RP selection */
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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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/* Select a 33/66/100Mhz clock */
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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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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 (adev->devno) { /* 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 &= (ap->port_no ? 0x0f : 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, master_port, master_data);
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}
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pci_write_config_byte(dev, 0x48, udma_enable);
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spin_unlock_irqrestore(&rdc_lock, flags);
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}
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static struct ata_port_operations rdc_pata_ops = {
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.inherits = &ata_bmdma32_port_ops,
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.cable_detect = rdc_pata_cable_detect,
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.set_piomode = rdc_set_piomode,
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.set_dmamode = rdc_set_dmamode,
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.prereset = rdc_pata_prereset,
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};
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static const struct ata_port_info rdc_port_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_UDMA5,
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.port_ops = &rdc_pata_ops,
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};
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static const struct scsi_host_template rdc_sht = {
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ATA_BMDMA_SHT(DRV_NAME),
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};
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/**
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* rdc_init_one - Register PIIX ATA PCI device with kernel services
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* @pdev: PCI device to register
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* @ent: Entry in rdc_pci_tbl matching with @pdev
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*
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* Called from kernel PCI layer. We probe for combined mode (sigh),
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* and then hand over control to libata, for it to do the rest.
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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 rdc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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struct device *dev = &pdev->dev;
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struct ata_port_info port_info[2];
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const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] };
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struct ata_host *host;
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struct rdc_host_priv *hpriv;
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int rc;
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ata_print_version_once(&pdev->dev, DRV_VERSION);
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port_info[0] = rdc_port_info;
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port_info[1] = rdc_port_info;
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/* enable device and prepare host */
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rc = pcim_enable_device(pdev);
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if (rc)
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return rc;
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hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
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if (!hpriv)
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return -ENOMEM;
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/* Save IOCFG, this will be used for cable detection, quirk
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* detection and restoration on detach.
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*/
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pci_read_config_dword(pdev, 0x54, &hpriv->saved_iocfg);
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rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
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if (rc)
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return rc;
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host->private_data = hpriv;
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pci_intx(pdev, 1);
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host->flags |= ATA_HOST_PARALLEL_SCAN;
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pci_set_master(pdev);
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return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, &rdc_sht);
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}
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static void rdc_remove_one(struct pci_dev *pdev)
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{
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struct ata_host *host = pci_get_drvdata(pdev);
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struct rdc_host_priv *hpriv = host->private_data;
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pci_write_config_dword(pdev, 0x54, hpriv->saved_iocfg);
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ata_pci_remove_one(pdev);
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}
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static const struct pci_device_id rdc_pci_tbl[] = {
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{ PCI_DEVICE(0x17F3, 0x1011), },
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{ PCI_DEVICE(0x17F3, 0x1012), },
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{ } /* terminate list */
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};
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static struct pci_driver rdc_pci_driver = {
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.name = DRV_NAME,
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.id_table = rdc_pci_tbl,
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.probe = rdc_init_one,
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.remove = rdc_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(rdc_pci_driver);
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MODULE_AUTHOR("Alan Cox (based on ata_piix)");
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MODULE_DESCRIPTION("SCSI low-level driver for RDC PATA controllers");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, rdc_pci_tbl);
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MODULE_VERSION(DRV_VERSION);
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