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| 1 | /* |
| 2 | * pata_sch.c - Intel SCH PATA controllers |
| 3 | * |
| 4 | * Copyright (c) 2008 Alek Du <alek.du@intel.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License 2 as published |
| 8 | * by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; see the file COPYING. If not, write to |
| 17 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * Supports: |
| 23 | * Intel SCH (AF82US15W, AF82US15L, AF82UL11L) chipsets -- see spec at: |
| 24 | * http://download.intel.com/design/chipsets/embedded/datashts/319537.pdf |
| 25 | */ |
| 26 | |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/pci.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/blkdev.h> |
| 32 | #include <linux/delay.h> |
| 33 | #include <linux/device.h> |
| 34 | #include <scsi/scsi_host.h> |
| 35 | #include <linux/libata.h> |
| 36 | #include <linux/dmi.h> |
| 37 | |
| 38 | #define DRV_NAME "pata_sch" |
| 39 | #define DRV_VERSION "0.2" |
| 40 | |
| 41 | /* see SCH datasheet page 351 */ |
| 42 | enum { |
| 43 | D0TIM = 0x80, /* Device 0 Timing Register */ |
| 44 | D1TIM = 0x84, /* Device 1 Timing Register */ |
| 45 | PM = 0x07, /* PIO Mode Bit Mask */ |
| 46 | MDM = (0x03 << 8), /* Multi-word DMA Mode Bit Mask */ |
| 47 | UDM = (0x07 << 16), /* Ultra DMA Mode Bit Mask */ |
| 48 | PPE = (1 << 30), /* Prefetch/Post Enable */ |
| 49 | USD = (1 << 31), /* Use Synchronous DMA */ |
| 50 | }; |
| 51 | |
| 52 | static int sch_init_one(struct pci_dev *pdev, |
| 53 | const struct pci_device_id *ent); |
| 54 | static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev); |
| 55 | static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev); |
| 56 | |
| 57 | static const struct pci_device_id sch_pci_tbl[] = { |
| 58 | /* Intel SCH PATA Controller */ |
| 59 | { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_IDE), 0 }, |
| 60 | { } /* terminate list */ |
| 61 | }; |
| 62 | |
| 63 | static struct pci_driver sch_pci_driver = { |
| 64 | .name = DRV_NAME, |
| 65 | .id_table = sch_pci_tbl, |
| 66 | .probe = sch_init_one, |
| 67 | .remove = ata_pci_remove_one, |
| 68 | #ifdef CONFIG_PM |
| 69 | .suspend = ata_pci_device_suspend, |
| 70 | .resume = ata_pci_device_resume, |
| 71 | #endif |
| 72 | }; |
| 73 | |
| 74 | static struct scsi_host_template sch_sht = { |
| 75 | ATA_BMDMA_SHT(DRV_NAME), |
| 76 | }; |
| 77 | |
| 78 | static struct ata_port_operations sch_pata_ops = { |
| 79 | .inherits = &ata_bmdma_port_ops, |
| 80 | .cable_detect = ata_cable_unknown, |
| 81 | .set_piomode = sch_set_piomode, |
| 82 | .set_dmamode = sch_set_dmamode, |
| 83 | }; |
| 84 | |
| 85 | static struct ata_port_info sch_port_info = { |
| 86 | .flags = ATA_FLAG_SLAVE_POSS, |
| 87 | .pio_mask = ATA_PIO4, |
| 88 | .mwdma_mask = ATA_MWDMA2, |
| 89 | .udma_mask = ATA_UDMA5, |
| 90 | .port_ops = &sch_pata_ops, |
| 91 | }; |
| 92 | |
| 93 | MODULE_AUTHOR("Alek Du <alek.du@intel.com>"); |
| 94 | MODULE_DESCRIPTION("SCSI low-level driver for Intel SCH PATA controllers"); |
| 95 | MODULE_LICENSE("GPL"); |
| 96 | MODULE_DEVICE_TABLE(pci, sch_pci_tbl); |
| 97 | MODULE_VERSION(DRV_VERSION); |
| 98 | |
| 99 | /** |
| 100 | * sch_set_piomode - Initialize host controller PATA PIO timings |
| 101 | * @ap: Port whose timings we are configuring |
| 102 | * @adev: ATA device |
| 103 | * |
| 104 | * Set PIO mode for device, in host controller PCI config space. |
| 105 | * |
| 106 | * LOCKING: |
| 107 | * None (inherited from caller). |
| 108 | */ |
| 109 | |
| 110 | static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev) |
| 111 | { |
| 112 | unsigned int pio = adev->pio_mode - XFER_PIO_0; |
| 113 | struct pci_dev *dev = to_pci_dev(ap->host->dev); |
| 114 | unsigned int port = adev->devno ? D1TIM : D0TIM; |
| 115 | unsigned int data; |
| 116 | |
| 117 | pci_read_config_dword(dev, port, &data); |
| 118 | /* see SCH datasheet page 351 */ |
| 119 | /* set PIO mode */ |
| 120 | data &= ~(PM | PPE); |
| 121 | data |= pio; |
| 122 | /* enable PPE for block device */ |
| 123 | if (adev->class == ATA_DEV_ATA) |
| 124 | data |= PPE; |
| 125 | pci_write_config_dword(dev, port, data); |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * sch_set_dmamode - Initialize host controller PATA DMA timings |
| 130 | * @ap: Port whose timings we are configuring |
| 131 | * @adev: ATA device |
| 132 | * |
| 133 | * Set MW/UDMA mode for device, in host controller PCI config space. |
| 134 | * |
| 135 | * LOCKING: |
| 136 | * None (inherited from caller). |
| 137 | */ |
| 138 | |
| 139 | static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev) |
| 140 | { |
| 141 | unsigned int dma_mode = adev->dma_mode; |
| 142 | struct pci_dev *dev = to_pci_dev(ap->host->dev); |
| 143 | unsigned int port = adev->devno ? D1TIM : D0TIM; |
| 144 | unsigned int data; |
| 145 | |
| 146 | pci_read_config_dword(dev, port, &data); |
| 147 | /* see SCH datasheet page 351 */ |
| 148 | if (dma_mode >= XFER_UDMA_0) { |
| 149 | /* enable Synchronous DMA mode */ |
| 150 | data |= USD; |
| 151 | data &= ~UDM; |
| 152 | data |= (dma_mode - XFER_UDMA_0) << 16; |
| 153 | } else { /* must be MWDMA mode, since we masked SWDMA already */ |
| 154 | data &= ~(USD | MDM); |
| 155 | data |= (dma_mode - XFER_MW_DMA_0) << 8; |
| 156 | } |
| 157 | pci_write_config_dword(dev, port, data); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * sch_init_one - Register SCH ATA PCI device with kernel services |
| 162 | * @pdev: PCI device to register |
| 163 | * @ent: Entry in sch_pci_tbl matching with @pdev |
| 164 | * |
| 165 | * LOCKING: |
| 166 | * Inherited from PCI layer (may sleep). |
| 167 | * |
| 168 | * RETURNS: |
| 169 | * Zero on success, or -ERRNO value. |
| 170 | */ |
| 171 | |
| 172 | static int __devinit sch_init_one(struct pci_dev *pdev, |
| 173 | const struct pci_device_id *ent) |
| 174 | { |
| 175 | const struct ata_port_info *ppi[] = { &sch_port_info, NULL }; |
| 176 | |
| 177 | ata_print_version_once(&pdev->dev, DRV_VERSION); |
| 178 | |
| 179 | return ata_pci_bmdma_init_one(pdev, ppi, &sch_sht, NULL, 0); |
| 180 | } |
| 181 | |
| 182 | module_pci_driver(sch_pci_driver); |
| 183 |
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