/*
* pata_sil680.c - SIL680 PATA for new ATA layer
* (C) 2005 Red Hat Inc
*
* based upon
*
* linux/drivers/ide/pci/siimage.c Version 1.07 Nov 30, 2003
*
* Copyright (C) 2001-2002 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2003 Red Hat <alan@redhat.com>
*
* May be copied or modified under the terms of the GNU General Public License
*
* Documentation publicly available.
*
* If you have strange problems with nVidia chipset systems please
* see the SI support documentation and update your system BIOS
* if necessary
*
* TODO
* If we know all our devices are LBA28 (or LBA28 sized) we could use
* the command fifo mode.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#define DRV_NAME "pata_sil680"
#define DRV_VERSION "0.4.9"
#define SIL680_MMIO_BAR 5
/**
* sil680_selreg - return register base
* @ap: ATA interface
* @r: config offset
*
* Turn a config register offset into the right address in PCI space
* to access the control register in question.
*
* Thankfully this is a configuration operation so isn't performance
* criticial.
*/
static unsigned long sil680_selreg(struct ata_port *ap, int r)
{
unsigned long base = 0xA0 + r;
base += (ap->port_no << 4);
return base;
}
/**
* sil680_seldev - return register base
* @ap: ATA interface
* @r: config offset
*
* Turn a config register offset into the right address in PCI space
* to access the control register in question including accounting for
* the unit shift.
*/
static unsigned long sil680_seldev(struct ata_port *ap, struct ata_device *adev, int r)
{
unsigned long base = 0xA0 + r;
base += (ap->port_no << 4);
base |= adev->devno ? 2 : 0;
return base;
}
/**
* sil680_cable_detect - cable detection
* @ap: ATA port
*
* Perform cable detection. The SIL680 stores this in PCI config
* space for us.
*/
static int sil680_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
unsigned long addr = sil680_selreg(ap, 0);
u8 ata66;
pci_read_config_byte(pdev, addr, &ata66);
if (ata66 & 1)
return ATA_CBL_PATA80;
else
return ATA_CBL_PATA40;
}
/**
* sil680_set_piomode - set PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Program the SIL680 registers for PIO mode. Note that the task speed
* registers are shared between the devices so we must pick the lowest
* mode for command work.
*/
static void sil680_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
static const u16 speed_p[5] = {
0x328A, 0x2283, 0x1104, 0x10C3, 0x10C1
};
static const u16 speed_t[5] = {
0x328A, 0x2283, 0x1281, 0x10C3, 0x10C1
};
unsigned long tfaddr = sil680_selreg(ap, 0x02);
unsigned long addr = sil680_seldev(ap, adev, 0x04);
unsigned long addr_mask = 0x80 + 4 * ap->port_no;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int pio = adev->pio_mode - XFER_PIO_0;
int lowest_pio = pio;
int port_shift = 4 * adev->devno;
u16 reg;
u8 mode;
struct ata_device *pair = ata_dev_pair(adev);
if (pair != NULL && adev->pio_mode > pair->pio_mode)
lowest_pio = pair->pio_mode - XFER_PIO_0;
pci_write_config_word(pdev, addr, speed_p[pio]);
pci_write_config_word(pdev, tfaddr, speed_t[lowest_pio]);
pci_read_config_word(pdev, tfaddr-2, ®);
pci_read_config_byte(pdev, addr_mask, &mode);
reg &= ~0x0200; /* Clear IORDY */
mode &= ~(3 << port_shift); /* Clear IORDY and DMA bits */
if (ata_pio_need_iordy(adev)) {
reg |= 0x0200; /* Enable IORDY */
mode |= 1 << port_shift;
}
pci_write_config_word(pdev, tfaddr-2, reg);
pci_write_config_byte(pdev, addr_mask, mode);
}
/**
* sil680_set_dmamode - set DMA mode data
* @ap: ATA interface
* @adev: ATA device
*
* Program the MWDMA/UDMA modes for the sil680 chipset.
*
* The MWDMA mode values are pulled from a lookup table
* while the chipset uses mode number for UDMA.
*/
static void sil680_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
static const u8 ultra_table[2][7] = {
{ 0x0C, 0x07, 0x05, 0x04, 0x02, 0x01, 0xFF }, /* 100MHz */
{ 0x0F, 0x0B, 0x07, 0x05, 0x03, 0x02, 0x01 }, /* 133Mhz */
};
static const u16 dma_table[3] = { 0x2208, 0x10C2, 0x10C1 };
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
unsigned long ma = sil680_seldev(ap, adev, 0x08);
unsigned long ua = sil680_seldev(ap, adev, 0x0C);
unsigned long addr_mask = 0x80 + 4 * ap->port_no;
int port_shift = adev->devno * 4;
u8 scsc, mode;
u16 multi, ultra;
pci_read_config_byte(pdev, 0x8A, &scsc);
pci_read_config_byte(pdev, addr_mask, &mode);
pci_read_config_word(pdev, ma, &multi);
pci_read_config_word(pdev, ua, &ultra);
/* Mask timing bits */
ultra &= ~0x3F;
mode &= ~(0x03 << port_shift);
/* Extract scsc */
scsc = (scsc & 0x30) ? 1 : 0;
if (adev->dma_mode >= XFER_UDMA_0) {
multi = 0x10C1;
ultra |= ultra_table[scsc][adev->dma_mode - XFER_UDMA_0];
mode |= (0x03 << port_shift);
} else {
multi = dma_table[adev->dma_mode - XFER_MW_DMA_0];
mode |= (0x02 << port_shift);
}
pci_write_config_byte(pdev, addr_mask, mode);
pci_write_config_word(pdev, ma, multi);
pci_write_config_word(pdev, ua, ultra);
}
/**
* sil680_sff_exec_command - issue ATA command to host controller
* @ap: port to which command is being issued
* @tf: ATA taskfile register set
*
* Issues ATA command, with proper synchronization with interrupt
* handler / other threads. Use our MMIO space for PCI posting to avoid
* a hideously slow cycle all the way to the device.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
static void sil680_sff_exec_command(struct ata_port *ap,
const struct ata_taskfile *tf)
{
DPRINTK("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
iowrite8(tf->command, ap->ioaddr.command_addr);
ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
}
static bool sil680_sff_irq_check(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
unsigned long addr = sil680_selreg(ap, 1);
u8 val;
pci_read_config_byte(pdev, addr, &val);
return val & 0x08;
}
static struct scsi_host_template sil680_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations sil680_port_ops = {
.inherits = &ata_bmdma32_port_ops,
.sff_exec_command = sil680_sff_exec_command,
.sff_irq_check = sil680_sff_irq_check,
.cable_detect = sil680_cable_detect,
.set_piomode = sil680_set_piomode,
.set_dmamode = sil680_set_dmamode,
};
/**
* sil680_init_chip - chip setup
* @pdev: PCI device
*
* Perform all the chip setup which must be done both when the device
* is powered up on boot and when we resume in case we resumed from RAM.
* Returns the final clock settings.
*/
static u8 sil680_init_chip(struct pci_dev *pdev, int *try_mmio)
{
u8 tmpbyte = 0;
/* FIXME: double check */
pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
pdev->revision ? 1 : 255);
pci_write_config_byte(pdev, 0x80, 0x00);
pci_write_config_byte(pdev, 0x84, 0x00);
pci_read_config_byte(pdev, 0x8A, &tmpbyte);
dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
tmpbyte & 1, tmpbyte & 0x30);
*try_mmio = 0;
#ifdef CONFIG_PPC
if (machine_is(cell))
*try_mmio = (tmpbyte & 1) || pci_resource_start(pdev, 5);
#endif
switch (tmpbyte & 0x30) {
case 0x00:
/* 133 clock attempt to force it on */
pci_write_config_byte(pdev, 0x8A, tmpbyte|0x10);
break;
case 0x30:
/* if clocking is disabled */
/* 133 clock attempt to force it on */
pci_write_config_byte(pdev, 0x8A, tmpbyte & ~0x20);
break;
case 0x10:
/* 133 already */
break;
case 0x20:
/* BIOS set PCI x2 clocking */
break;
}
pci_read_config_byte(pdev, 0x8A, &tmpbyte);
dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
tmpbyte & 1, tmpbyte & 0x30);
pci_write_config_byte(pdev, 0xA1, 0x72);
pci_write_config_word(pdev, 0xA2, 0x328A);
pci_write_config_dword(pdev, 0xA4, 0x62DD62DD);
pci_write_config_dword(pdev, 0xA8, 0x43924392);
pci_write_config_dword(pdev, 0xAC, 0x40094009);
pci_write_config_byte(pdev, 0xB1, 0x72);
pci_write_config_word(pdev, 0xB2, 0x328A);
pci_write_config_dword(pdev, 0xB4, 0x62DD62DD);
pci_write_config_dword(pdev, 0xB8, 0x43924392);
pci_write_config_dword(pdev, 0xBC, 0x40094009);
switch (tmpbyte & 0x30) {
case 0x00:
printk(KERN_INFO "sil680: 100MHz clock.\n");
break;
case 0x10:
printk(KERN_INFO "sil680: 133MHz clock.\n");
break;
case 0x20:
printk(KERN_INFO "sil680: Using PCI clock.\n");
break;
/* This last case is _NOT_ ok */
case 0x30:
printk(KERN_ERR "sil680: Clock disabled ?\n");
}
return tmpbyte & 0x30;
}
static int __devinit sil680_init_one(struct pci_dev *pdev,
const struct pci_device_id *id)
{
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA6,
.port_ops = &sil680_port_ops
};
static const struct ata_port_info info_slow = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
.port_ops = &sil680_port_ops
};
const struct ata_port_info *ppi[] = { &info, NULL };
struct ata_host *host;
void __iomem *mmio_base;
int rc, try_mmio;
ata_print_version_once(&pdev->dev, DRV_VERSION);
rc = pcim_enable_device(pdev);
if (rc)
return rc;
switch (sil680_init_chip(pdev, &try_mmio)) {
case 0:
ppi[0] = &info_slow;
break;
case 0x30:
return -ENODEV;
}
if (!try_mmio)
goto use_ioports;
/* Try to acquire MMIO resources and fallback to PIO if
* that fails
*/
rc = pcim_iomap_regions(pdev, 1 << SIL680_MMIO_BAR, DRV_NAME);
if (rc)
goto use_ioports;
/* Allocate host and set it up */
host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
if (!host)
return -ENOMEM;
host->iomap = pcim_iomap_table(pdev);
/* Setup DMA masks */
rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
if (rc)
return rc;
rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
if (rc)
return rc;
pci_set_master(pdev);
/* Get MMIO base and initialize port addresses */
mmio_base = host->iomap[SIL680_MMIO_BAR];
host->ports[0]->ioaddr.bmdma_addr = mmio_base + 0x00;
host->ports[0]->ioaddr.cmd_addr = mmio_base + 0x80;
host->ports[0]->ioaddr.ctl_addr = mmio_base + 0x8a;
host->ports[0]->ioaddr.altstatus_addr = mmio_base + 0x8a;
ata_sff_std_ports(&host->ports[0]->ioaddr);
host->ports[1]->ioaddr.bmdma_addr = mmio_base + 0x08;
host->ports[1]->ioaddr.cmd_addr = mmio_base + 0xc0;
host->ports[1]->ioaddr.ctl_addr = mmio_base + 0xca;
host->ports[1]->ioaddr.altstatus_addr = mmio_base + 0xca;
ata_sff_std_ports(&host->ports[1]->ioaddr);
/* Register & activate */
return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
IRQF_SHARED, &sil680_sht);
use_ioports:
return ata_pci_bmdma_init_one(pdev, ppi, &sil680_sht, NULL, 0);
}
#ifdef CONFIG_PM
static int sil680_reinit_one(struct pci_dev *pdev)
{
struct ata_host *host = dev_get_drvdata(&pdev->dev);
int try_mmio, rc;
rc = ata_pci_device_do_resume(pdev);
if (rc)
return rc;
sil680_init_chip(pdev, &try_mmio);
ata_host_resume(host);
return 0;
}
#endif
static const struct pci_device_id sil680[] = {
{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },
{ },
};
static struct pci_driver sil680_pci_driver = {
.name = DRV_NAME,
.id_table = sil680,
.probe = sil680_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = sil680_reinit_one,
#endif
};
static int __init sil680_init(void)
{
return pci_register_driver(&sil680_pci_driver);
}
static void __exit sil680_exit(void)
{
pci_unregister_driver(&sil680_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for SI680 PATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, sil680);
MODULE_VERSION(DRV_VERSION);
module_init(sil680_init);
module_exit(sil680_exit);