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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * pata_sch.c - Intel SCH PATA controllers4 *5 * Copyright (c) 2008 Alek Du <alek.du@intel.com>6 */7 8/*9 * Supports:10 * Intel SCH (AF82US15W, AF82US15L, AF82UL11L) chipsets -- see spec at:11 * http://download.intel.com/design/chipsets/embedded/datashts/319537.pdf12 */13 14#include <linux/kernel.h>15#include <linux/module.h>16#include <linux/pci.h>17#include <linux/blkdev.h>18#include <linux/delay.h>19#include <linux/device.h>20#include <scsi/scsi_host.h>21#include <linux/libata.h>22#include <linux/dmi.h>23 24#define DRV_NAME "pata_sch"25#define DRV_VERSION "0.2"26 27/* see SCH datasheet page 351 */28enum {29 D0TIM = 0x80, /* Device 0 Timing Register */30 D1TIM = 0x84, /* Device 1 Timing Register */31 PM = 0x07, /* PIO Mode Bit Mask */32 MDM = (0x03 << 8), /* Multi-word DMA Mode Bit Mask */33 UDM = (0x07 << 16), /* Ultra DMA Mode Bit Mask */34 PPE = (1 << 30), /* Prefetch/Post Enable */35 USD = (1 << 31), /* Use Synchronous DMA */36};37 38static int sch_init_one(struct pci_dev *pdev,39 const struct pci_device_id *ent);40static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev);41static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev);42 43static const struct pci_device_id sch_pci_tbl[] = {44 /* Intel SCH PATA Controller */45 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_IDE), 0 },46 { } /* terminate list */47};48 49static struct pci_driver sch_pci_driver = {50 .name = DRV_NAME,51 .id_table = sch_pci_tbl,52 .probe = sch_init_one,53 .remove = ata_pci_remove_one,54#ifdef CONFIG_PM_SLEEP55 .suspend = ata_pci_device_suspend,56 .resume = ata_pci_device_resume,57#endif58};59 60static const struct scsi_host_template sch_sht = {61 ATA_BMDMA_SHT(DRV_NAME),62};63 64static struct ata_port_operations sch_pata_ops = {65 .inherits = &ata_bmdma_port_ops,66 .cable_detect = ata_cable_unknown,67 .set_piomode = sch_set_piomode,68 .set_dmamode = sch_set_dmamode,69};70 71static const struct ata_port_info sch_port_info = {72 .flags = ATA_FLAG_SLAVE_POSS,73 .pio_mask = ATA_PIO4,74 .mwdma_mask = ATA_MWDMA2,75 .udma_mask = ATA_UDMA5,76 .port_ops = &sch_pata_ops,77};78 79MODULE_AUTHOR("Alek Du <alek.du@intel.com>");80MODULE_DESCRIPTION("SCSI low-level driver for Intel SCH PATA controllers");81MODULE_LICENSE("GPL");82MODULE_DEVICE_TABLE(pci, sch_pci_tbl);83MODULE_VERSION(DRV_VERSION);84 85/**86 * sch_set_piomode - Initialize host controller PATA PIO timings87 * @ap: Port whose timings we are configuring88 * @adev: ATA device89 *90 * Set PIO mode for device, in host controller PCI config space.91 *92 * LOCKING:93 * None (inherited from caller).94 */95 96static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev)97{98 unsigned int pio = adev->pio_mode - XFER_PIO_0;99 struct pci_dev *dev = to_pci_dev(ap->host->dev);100 unsigned int port = adev->devno ? D1TIM : D0TIM;101 unsigned int data;102 103 pci_read_config_dword(dev, port, &data);104 /* see SCH datasheet page 351 */105 /* set PIO mode */106 data &= ~(PM | PPE);107 data |= pio;108 /* enable PPE for block device */109 if (adev->class == ATA_DEV_ATA)110 data |= PPE;111 pci_write_config_dword(dev, port, data);112}113 114/**115 * sch_set_dmamode - Initialize host controller PATA DMA timings116 * @ap: Port whose timings we are configuring117 * @adev: ATA device118 *119 * Set MW/UDMA mode for device, in host controller PCI config space.120 *121 * LOCKING:122 * None (inherited from caller).123 */124 125static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev)126{127 unsigned int dma_mode = adev->dma_mode;128 struct pci_dev *dev = to_pci_dev(ap->host->dev);129 unsigned int port = adev->devno ? D1TIM : D0TIM;130 unsigned int data;131 132 pci_read_config_dword(dev, port, &data);133 /* see SCH datasheet page 351 */134 if (dma_mode >= XFER_UDMA_0) {135 /* enable Synchronous DMA mode */136 data |= USD;137 data &= ~UDM;138 data |= (dma_mode - XFER_UDMA_0) << 16;139 } else { /* must be MWDMA mode, since we masked SWDMA already */140 data &= ~(USD | MDM);141 data |= (dma_mode - XFER_MW_DMA_0) << 8;142 }143 pci_write_config_dword(dev, port, data);144}145 146/**147 * sch_init_one - Register SCH ATA PCI device with kernel services148 * @pdev: PCI device to register149 * @ent: Entry in sch_pci_tbl matching with @pdev150 *151 * LOCKING:152 * Inherited from PCI layer (may sleep).153 *154 * RETURNS:155 * Zero on success, or -ERRNO value.156 */157 158static int sch_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)159{160 const struct ata_port_info *ppi[] = { &sch_port_info, NULL };161 162 ata_print_version_once(&pdev->dev, DRV_VERSION);163 164 return ata_pci_bmdma_init_one(pdev, ppi, &sch_sht, NULL, 0);165}166 167module_pci_driver(sch_pci_driver);168