/*
* 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/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 int sil680_selreg(struct ata_port *ap, int r)
{
return 0 xA0 + (ap->port_no << 4 ) + r;
}
/**
* sil680_seldev - return register base
* @ ap : ATA interface
* @ adev : ATA device
* @ 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 int sil680_seldev(struct ata_port *ap, struct ata_device *adev, int r)
{
return 0 xA0 + (ap->port_no << 4 ) + r + (adev->devno << 1 );
}
/**
* 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);
int 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 ] = {
0 x328A, 0 x2283, 0 x1104, 0 x10C3, 0 x10C1
};
static const u16 speed_t[5 ] = {
0 x328A, 0 x2283, 0 x1281, 0 x10C3, 0 x10C1
};
int tfaddr = sil680_selreg(ap, 0 x02);
int addr = sil680_seldev(ap, adev, 0 x04);
int addr_mask = 0 x80 + 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 &= ~0 x0200; /* Clear IORDY */
mode &= ~(3 << port_shift); /* Clear IORDY and DMA bits */
if (ata_pio_need_iordy(adev)) {
reg |= 0 x0200; /* 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 ] = {
{ 0 x0C, 0 x07, 0 x05, 0 x04, 0 x02, 0 x01, 0 xFF }, /* 100MHz */
{ 0 x0F, 0 x0B, 0 x07, 0 x05, 0 x03, 0 x02, 0 x01 }, /* 133Mhz */
};
static const u16 dma_table[3 ] = { 0 x2208, 0 x10C2, 0 x10C1 };
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int ma = sil680_seldev(ap, adev, 0 x08);
int ua = sil680_seldev(ap, adev, 0 x0C);
int addr_mask = 0 x80 + 4 * ap->port_no;
int port_shift = adev->devno * 4 ;
u8 scsc, mode;
u16 multi, ultra;
pci_read_config_byte(pdev, 0 x8A, &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 &= ~0 x3F;
mode &= ~(0 x03 << port_shift);
/* Extract scsc */
scsc = (scsc & 0 x30) ? 1 : 0 ;
if (adev->dma_mode >= XFER_UDMA_0) {
multi = 0 x10C1;
ultra |= ultra_table[scsc][adev->dma_mode - XFER_UDMA_0];
mode |= (0 x03 << port_shift);
} else {
multi = dma_table[adev->dma_mode - XFER_MW_DMA_0];
mode |= (0 x02 << 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)
{
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);
int addr = sil680_selreg(ap, 1 );
u8 val;
pci_read_config_byte(pdev, addr, &val);
return val & 0 x08;
}
static const 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
* @ try_mmio : Indicates to caller whether MMIO should be attempted
*
* 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, 0 x80, 0 x00);
pci_write_config_byte(pdev, 0 x84, 0 x00);
pci_read_config_byte(pdev, 0 x8A, &tmpbyte);
dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n" ,
tmpbyte & 1 , tmpbyte & 0 x30);
*try_mmio = 0 ;
#ifdef CONFIG_PPC
if (machine_is(cell))
*try_mmio = (tmpbyte & 1 ) || pci_resource_start(pdev, 5 );
#endif
switch (tmpbyte & 0 x30) {
case 0 x00:
/* 133 clock attempt to force it on */
pci_write_config_byte(pdev, 0 x8A, tmpbyte|0 x10);
break ;
case 0 x30:
/* if clocking is disabled */
/* 133 clock attempt to force it on */
pci_write_config_byte(pdev, 0 x8A, tmpbyte & ~0 x20);
break ;
case 0 x10:
/* 133 already */
break ;
case 0 x20:
/* BIOS set PCI x2 clocking */
break ;
}
pci_read_config_byte(pdev, 0 x8A, &tmpbyte);
dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n" ,
tmpbyte & 1 , tmpbyte & 0 x30);
pci_write_config_byte(pdev, 0 xA1, 0 x72);
pci_write_config_word(pdev, 0 xA2, 0 x328A);
pci_write_config_dword(pdev, 0 xA4, 0 x62DD62DD);
pci_write_config_dword(pdev, 0 xA8, 0 x43924392);
pci_write_config_dword(pdev, 0 xAC, 0 x40094009);
pci_write_config_byte(pdev, 0 xB1, 0 x72);
pci_write_config_word(pdev, 0 xB2, 0 x328A);
pci_write_config_dword(pdev, 0 xB4, 0 x62DD62DD);
pci_write_config_dword(pdev, 0 xB8, 0 x43924392);
pci_write_config_dword(pdev, 0 xBC, 0 x40094009);
switch (tmpbyte & 0 x30) {
case 0 x00:
dev_info(&pdev->dev, "sil680: 100MHz clock.\n" );
break ;
case 0 x10:
dev_info(&pdev->dev, "sil680: 133MHz clock.\n" );
break ;
case 0 x20:
dev_info(&pdev->dev, "sil680: Using PCI clock.\n" );
break ;
/* This last case is _NOT_ ok */
case 0 x30:
dev_err(&pdev->dev, "sil680: Clock disabled ?\n" );
}
return tmpbyte & 0 x30;
}
static int 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 0 x30:
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 = dma_set_mask_and_coherent(&pdev->dev, 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 + 0 x00;
host->ports[0 ]->ioaddr.cmd_addr = mmio_base + 0 x80;
host->ports[0 ]->ioaddr.ctl_addr = mmio_base + 0 x8a;
host->ports[0 ]->ioaddr.altstatus_addr = mmio_base + 0 x8a;
ata_sff_std_ports(&host->ports[0 ]->ioaddr);
host->ports[1 ]->ioaddr.bmdma_addr = mmio_base + 0 x08;
host->ports[1 ]->ioaddr.cmd_addr = mmio_base + 0 xc0;
host->ports[1 ]->ioaddr.ctl_addr = mmio_base + 0 xca;
host->ports[1 ]->ioaddr.altstatus_addr = mmio_base + 0 xca;
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_SLEEP
static int sil680_reinit_one(struct pci_dev *pdev)
{
struct ata_host *host = pci_get_drvdata(pdev);
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_SLEEP
.suspend = ata_pci_device_suspend,
.resume = sil680_reinit_one,
#endif
};
module_pci_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);
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