/* * pata_sch.c - Intel SCH PATA controllers * * Copyright (c) 2008 Alek Du <alek.du@intel.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License 2 as published * by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; see the file COPYING. If not, write to * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. * */ /* * Supports: * Intel SCH (AF82US15W, AF82US15L, AF82UL11L) chipsets -- see spec at: * http://download.intel.com/design/chipsets/embedded/datashts/319537.pdf */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/blkdev.h> #include <linux/delay.h> #include <linux/device.h> #include <scsi/scsi_host.h> #include <linux/libata.h> #include <linux/dmi.h> #define DRV_NAME "pata_sch" #define DRV_VERSION "0.2" /* see SCH datasheet page 351 */ enum { D0TIM = 0x80, /* Device 0 Timing Register */ D1TIM = 0x84, /* Device 1 Timing Register */ PM = 0x07, /* PIO Mode Bit Mask */ MDM = (0x03 << 8), /* Multi-word DMA Mode Bit Mask */ UDM = (0x07 << 16), /* Ultra DMA Mode Bit Mask */ PPE = (1 << 30), /* Prefetch/Post Enable */ USD = (1 << 31), /* Use Synchronous DMA */ }; static int sch_init_one(struct pci_dev *pdev, const struct pci_device_id *ent); static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev); static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev); static const struct pci_device_id sch_pci_tbl[] = { /* Intel SCH PATA Controller */ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_IDE), 0 }, { } /* terminate list */ }; static struct pci_driver sch_pci_driver = { .name = DRV_NAME, .id_table = sch_pci_tbl, .probe = sch_init_one, .remove = ata_pci_remove_one, #ifdef CONFIG_PM_SLEEP .suspend = ata_pci_device_suspend, .resume = ata_pci_device_resume, #endif }; static struct scsi_host_template sch_sht = { ATA_BMDMA_SHT(DRV_NAME), }; static struct ata_port_operations sch_pata_ops = { .inherits = &ata_bmdma_port_ops, .cable_detect = ata_cable_unknown, .set_piomode = sch_set_piomode, .set_dmamode = sch_set_dmamode, }; static const struct ata_port_info sch_port_info = { .flags = ATA_FLAG_SLAVE_POSS, .pio_mask = ATA_PIO4, .mwdma_mask = ATA_MWDMA2, .udma_mask = ATA_UDMA5, .port_ops = &sch_pata_ops, }; MODULE_AUTHOR("Alek Du <alek.du@intel.com>"); MODULE_DESCRIPTION("SCSI low-level driver for Intel SCH PATA controllers"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, sch_pci_tbl); MODULE_VERSION(DRV_VERSION); /** * sch_set_piomode - Initialize host controller PATA PIO timings * @ap: Port whose timings we are configuring * @adev: ATA device * * Set PIO mode for device, in host controller PCI config space. * * LOCKING: * None (inherited from caller). */ static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev) { unsigned int pio = adev->pio_mode - XFER_PIO_0; struct pci_dev *dev = to_pci_dev(ap->host->dev); unsigned int port = adev->devno ? D1TIM : D0TIM; unsigned int data; pci_read_config_dword(dev, port, &data); /* see SCH datasheet page 351 */ /* set PIO mode */ data &= ~(PM | PPE); data |= pio; /* enable PPE for block device */ if (adev->class == ATA_DEV_ATA) data |= PPE; pci_write_config_dword(dev, port, data); } /** * sch_set_dmamode - Initialize host controller PATA DMA timings * @ap: Port whose timings we are configuring * @adev: ATA device * * Set MW/UDMA mode for device, in host controller PCI config space. * * LOCKING: * None (inherited from caller). */ static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev) { unsigned int dma_mode = adev->dma_mode; struct pci_dev *dev = to_pci_dev(ap->host->dev); unsigned int port = adev->devno ? D1TIM : D0TIM; unsigned int data; pci_read_config_dword(dev, port, &data); /* see SCH datasheet page 351 */ if (dma_mode >= XFER_UDMA_0) { /* enable Synchronous DMA mode */ data |= USD; data &= ~UDM; data |= (dma_mode - XFER_UDMA_0) << 16; } else { /* must be MWDMA mode, since we masked SWDMA already */ data &= ~(USD | MDM); data |= (dma_mode - XFER_MW_DMA_0) << 8; } pci_write_config_dword(dev, port, data); } /** * sch_init_one - Register SCH ATA PCI device with kernel services * @pdev: PCI device to register * @ent: Entry in sch_pci_tbl matching with @pdev * * LOCKING: * Inherited from PCI layer (may sleep). * * RETURNS: * Zero on success, or -ERRNO value. */ static int sch_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) { const struct ata_port_info *ppi[] = { &sch_port_info, NULL }; ata_print_version_once(&pdev->dev, DRV_VERSION); return ata_pci_bmdma_init_one(pdev, ppi, &sch_sht, NULL, 0); } module_pci_driver(sch_pci_driver);