diff options
Diffstat (limited to 'drivers/ide/pci/it8172.c')
| -rw-r--r-- | drivers/ide/pci/it8172.c | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/drivers/ide/pci/it8172.c b/drivers/ide/pci/it8172.c new file mode 100644 index 00000000000..631927cf17d --- /dev/null +++ b/drivers/ide/pci/it8172.c @@ -0,0 +1,308 @@ +/* + * + * BRIEF MODULE DESCRIPTION + * IT8172 IDE controller support + * + * Copyright 2000 MontaVista Software Inc. + * Author: MontaVista Software, Inc. + * stevel@mvista.com or source@mvista.com + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/pci.h> +#include <linux/hdreg.h> +#include <linux/ide.h> +#include <linux/delay.h> +#include <linux/init.h> + +#include <asm/io.h> +#include <asm/it8172/it8172_int.h> + +/* + * Prototypes + */ +static u8 it8172_ratemask (ide_drive_t *drive) +{ + return 1; +} + +static void it8172_tune_drive (ide_drive_t *drive, u8 pio) +{ + ide_hwif_t *hwif = HWIF(drive); + struct pci_dev *dev = hwif->pci_dev; + int is_slave = (&hwif->drives[1] == drive); + unsigned long flags; + u16 drive_enables; + u32 drive_timing; + + pio = ide_get_best_pio_mode(drive, pio, 4, NULL); + spin_lock_irqsave(&ide_lock, flags); + pci_read_config_word(dev, 0x40, &drive_enables); + pci_read_config_dword(dev, 0x44, &drive_timing); + + /* + * FIX! The DIOR/DIOW pulse width and recovery times in port 0x44 + * are being left at the default values of 8 PCI clocks (242 nsec + * for a 33 MHz clock). These can be safely shortened at higher + * PIO modes. The DIOR/DIOW pulse width and recovery times only + * apply to PIO modes, not to the DMA modes. + */ + + /* + * Enable port 0x44. The IT8172G spec is confused; it calls + * this register the "Slave IDE Timing Register", but in fact, + * it controls timing for both master and slave drives. + */ + drive_enables |= 0x4000; + + if (is_slave) { + drive_enables &= 0xc006; + if (pio > 1) + /* enable prefetch and IORDY sample-point */ + drive_enables |= 0x0060; + } else { + drive_enables &= 0xc060; + if (pio > 1) + /* enable prefetch and IORDY sample-point */ + drive_enables |= 0x0006; + } + + pci_write_config_word(dev, 0x40, drive_enables); + spin_unlock_irqrestore(&ide_lock, flags); +} + +static u8 it8172_dma_2_pio (u8 xfer_rate) +{ + switch(xfer_rate) { + case XFER_UDMA_5: + case XFER_UDMA_4: + case XFER_UDMA_3: + case XFER_UDMA_2: + case XFER_UDMA_1: + case XFER_UDMA_0: + case XFER_MW_DMA_2: + case XFER_PIO_4: + return 4; + case XFER_MW_DMA_1: + case XFER_PIO_3: + return 3; + case XFER_SW_DMA_2: + case XFER_PIO_2: + return 2; + case XFER_MW_DMA_0: + case XFER_SW_DMA_1: + case XFER_SW_DMA_0: + case XFER_PIO_1: + case XFER_PIO_0: + case XFER_PIO_SLOW: + default: + return 0; + } +} + +static int it8172_tune_chipset (ide_drive_t *drive, u8 xferspeed) +{ + ide_hwif_t *hwif = HWIF(drive); + struct pci_dev *dev = hwif->pci_dev; + u8 speed = ide_rate_filter(it8172_ratemask(drive), xferspeed); + int a_speed = 3 << (drive->dn * 4); + int u_flag = 1 << drive->dn; + int u_speed = 0; + u8 reg48, reg4a; + + pci_read_config_byte(dev, 0x48, ®48); + pci_read_config_byte(dev, 0x4a, ®4a); + + /* + * Setting the DMA cycle time to 2 or 3 PCI clocks (60 and 91 nsec + * at 33 MHz PCI clock) seems to cause BadCRC errors during DMA + * transfers on some drives, even though both numbers meet the minimum + * ATAPI-4 spec of 73 and 54 nsec for UDMA 1 and 2 respectively. + * So the faster times are just commented out here. The good news is + * that the slower cycle time has very little affect on transfer + * performance. + */ + + switch(speed) { + case XFER_UDMA_4: + case XFER_UDMA_2: //u_speed = 2 << (drive->dn * 4); break; + case XFER_UDMA_5: + case XFER_UDMA_3: + case XFER_UDMA_1: //u_speed = 1 << (drive->dn * 4); break; + case XFER_UDMA_0: u_speed = 0 << (drive->dn * 4); break; + case XFER_MW_DMA_2: + case XFER_MW_DMA_1: + case XFER_MW_DMA_0: + case XFER_SW_DMA_2: break; + case XFER_PIO_4: + case XFER_PIO_3: + case XFER_PIO_2: + case XFER_PIO_0: break; + default: return -1; + } + + if (speed >= XFER_UDMA_0) { + pci_write_config_byte(dev, 0x48, reg48 | u_flag); + reg4a &= ~a_speed; + pci_write_config_byte(dev, 0x4a, reg4a | u_speed); + } else { + pci_write_config_byte(dev, 0x48, reg48 & ~u_flag); + pci_write_config_byte(dev, 0x4a, reg4a & ~a_speed); + } + + it8172_tune_drive(drive, it8172_dma_2_pio(speed)); + return (ide_config_drive_speed(drive, speed)); +} + +static int it8172_config_chipset_for_dma (ide_drive_t *drive) +{ + u8 speed = ide_dma_speed(drive, it8172_ratemask(drive)); + + if (!(speed)) { + u8 tspeed = ide_get_best_pio_mode(drive, 255, 4, NULL); + speed = it8172_dma_2_pio(XFER_PIO_0 + tspeed); + } + + (void) it8172_tune_chipset(drive, speed); + return ide_dma_enable(drive); +} + +static int it8172_config_drive_xfer_rate (ide_drive_t *drive) +{ + ide_hwif_t *hwif = HWIF(drive); + struct hd_driveid *id = drive->id; + + drive->init_speed = 0; + + if (id && (id->capability & 1) && drive->autodma) { + + if (ide_use_dma(drive)) { + if (it8172_config_chipset_for_dma(drive)) + return hwif->ide_dma_on(drive); + } + + goto fast_ata_pio; + + } else if ((id->capability & 8) || (id->field_valid & 2)) { +fast_ata_pio: + it8172_tune_drive(drive, 5); + return hwif->ide_dma_off_quietly(drive); + } + /* IORDY not supported */ + return 0; +} + +static unsigned int __init init_chipset_it8172 (struct pci_dev *dev, const char *name) +{ + unsigned char progif; + + /* + * Place both IDE interfaces into PCI "native" mode + */ + pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); + pci_write_config_byte(dev, PCI_CLASS_PROG, progif | 0x05); + + return IT8172_IDE_IRQ; +} + + +static void __init init_hwif_it8172 (ide_hwif_t *hwif) +{ + struct pci_dev* dev = hwif->pci_dev; + unsigned long cmdBase, ctrlBase; + + hwif->autodma = 0; + hwif->tuneproc = &it8172_tune_drive; + hwif->speedproc = &it8172_tune_chipset; + + cmdBase = dev->resource[0].start; + ctrlBase = dev->resource[1].start; + + ide_init_hwif_ports(&hwif->hw, cmdBase, ctrlBase | 2, NULL); + memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports)); + hwif->noprobe = 0; + + if (!hwif->dma_base) { + hwif->drives[0].autotune = 1; + hwif->drives[1].autotune = 1; + return; + } + + hwif->atapi_dma = 1; + hwif->ultra_mask = 0x07; + hwif->mwdma_mask = 0x06; + hwif->swdma_mask = 0x04; + + hwif->ide_dma_check = &it8172_config_drive_xfer_rate; + if (!noautodma) + hwif->autodma = 1; + hwif->drives[0].autodma = hwif->autodma; + hwif->drives[1].autodma = hwif->autodma; +} + +static ide_pci_device_t it8172_chipsets[] __devinitdata = { + { /* 0 */ + .name = "IT8172G", + .init_chipset = init_chipset_it8172, + .init_hwif = init_hwif_it8172, + .channels = 2, + .autodma = AUTODMA, + .enablebits = {{0x00,0x00,0x00}, {0x40,0x00,0x01}}, + .bootable = ON_BOARD, + } +}; + +static int __devinit it8172_init_one(struct pci_dev *dev, const struct pci_device_id *id) +{ + if ((!(PCI_FUNC(dev->devfn) & 1) || + (!((dev->class >> 8) == PCI_CLASS_STORAGE_IDE)))) + return -ENODEV; /* IT8172 is more than an IDE controller */ + return ide_setup_pci_device(dev, &it8172_chipsets[id->driver_data]); +} + +static struct pci_device_id it8172_pci_tbl[] = { + { PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_IT8172G, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, + { 0, }, +}; +MODULE_DEVICE_TABLE(pci, it8172_pci_tbl); + +static struct pci_driver driver = { + .name = "IT8172_IDE", + .id_table = it8172_pci_tbl, + .probe = it8172_init_one, +}; + +static int it8172_ide_init(void) +{ + return ide_pci_register_driver(&driver); +} + +module_init(it8172_ide_init); + +MODULE_AUTHOR("SteveL@mvista.com"); +MODULE_DESCRIPTION("PCI driver module for ITE 8172 IDE"); +MODULE_LICENSE("GPL"); |