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Linux/drivers/ata/pata_sch.c

  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/blkdev.h>
 31 #include <linux/delay.h>
 32 #include <linux/device.h>
 33 #include <scsi/scsi_host.h>
 34 #include <linux/libata.h>
 35 #include <linux/dmi.h>
 36 
 37 #define DRV_NAME        "pata_sch"
 38 #define DRV_VERSION     "0.2"
 39 
 40 /* see SCH datasheet page 351 */
 41 enum {
 42         D0TIM   = 0x80,         /* Device 0 Timing Register */
 43         D1TIM   = 0x84,         /* Device 1 Timing Register */
 44         PM      = 0x07,         /* PIO Mode Bit Mask */
 45         MDM     = (0x03 << 8),  /* Multi-word DMA Mode Bit Mask */
 46         UDM     = (0x07 << 16), /* Ultra DMA Mode Bit Mask */
 47         PPE     = (1 << 30),    /* Prefetch/Post Enable */
 48         USD     = (1 << 31),    /* Use Synchronous DMA */
 49 };
 50 
 51 static int sch_init_one(struct pci_dev *pdev,
 52                          const struct pci_device_id *ent);
 53 static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev);
 54 static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev);
 55 
 56 static const struct pci_device_id sch_pci_tbl[] = {
 57         /* Intel SCH PATA Controller */
 58         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_IDE), 0 },
 59         { }     /* terminate list */
 60 };
 61 
 62 static struct pci_driver sch_pci_driver = {
 63         .name                   = DRV_NAME,
 64         .id_table               = sch_pci_tbl,
 65         .probe                  = sch_init_one,
 66         .remove                 = ata_pci_remove_one,
 67 #ifdef CONFIG_PM
 68         .suspend                = ata_pci_device_suspend,
 69         .resume                 = ata_pci_device_resume,
 70 #endif
 71 };
 72 
 73 static struct scsi_host_template sch_sht = {
 74         ATA_BMDMA_SHT(DRV_NAME),
 75 };
 76 
 77 static struct ata_port_operations sch_pata_ops = {
 78         .inherits               = &ata_bmdma_port_ops,
 79         .cable_detect           = ata_cable_unknown,
 80         .set_piomode            = sch_set_piomode,
 81         .set_dmamode            = sch_set_dmamode,
 82 };
 83 
 84 static struct ata_port_info sch_port_info = {
 85         .flags          = ATA_FLAG_SLAVE_POSS,
 86         .pio_mask       = ATA_PIO4,
 87         .mwdma_mask     = ATA_MWDMA2,
 88         .udma_mask      = ATA_UDMA5,
 89         .port_ops       = &sch_pata_ops,
 90 };
 91 
 92 MODULE_AUTHOR("Alek Du <alek.du@intel.com>");
 93 MODULE_DESCRIPTION("SCSI low-level driver for Intel SCH PATA controllers");
 94 MODULE_LICENSE("GPL");
 95 MODULE_DEVICE_TABLE(pci, sch_pci_tbl);
 96 MODULE_VERSION(DRV_VERSION);
 97 
 98 /**
 99  *      sch_set_piomode - Initialize host controller PATA PIO timings
100  *      @ap: Port whose timings we are configuring
101  *      @adev: ATA device
102  *
103  *      Set PIO mode for device, in host controller PCI config space.
104  *
105  *      LOCKING:
106  *      None (inherited from caller).
107  */
108 
109 static void sch_set_piomode(struct ata_port *ap, struct ata_device *adev)
110 {
111         unsigned int pio        = adev->pio_mode - XFER_PIO_0;
112         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
113         unsigned int port       = adev->devno ? D1TIM : D0TIM;
114         unsigned int data;
115 
116         pci_read_config_dword(dev, port, &data);
117         /* see SCH datasheet page 351 */
118         /* set PIO mode */
119         data &= ~(PM | PPE);
120         data |= pio;
121         /* enable PPE for block device */
122         if (adev->class == ATA_DEV_ATA)
123                 data |= PPE;
124         pci_write_config_dword(dev, port, data);
125 }
126 
127 /**
128  *      sch_set_dmamode - Initialize host controller PATA DMA timings
129  *      @ap: Port whose timings we are configuring
130  *      @adev: ATA device
131  *
132  *      Set MW/UDMA mode for device, in host controller PCI config space.
133  *
134  *      LOCKING:
135  *      None (inherited from caller).
136  */
137 
138 static void sch_set_dmamode(struct ata_port *ap, struct ata_device *adev)
139 {
140         unsigned int dma_mode   = adev->dma_mode;
141         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
142         unsigned int port       = adev->devno ? D1TIM : D0TIM;
143         unsigned int data;
144 
145         pci_read_config_dword(dev, port, &data);
146         /* see SCH datasheet page 351 */
147         if (dma_mode >= XFER_UDMA_0) {
148                 /* enable Synchronous DMA mode */
149                 data |= USD;
150                 data &= ~UDM;
151                 data |= (dma_mode - XFER_UDMA_0) << 16;
152         } else { /* must be MWDMA mode, since we masked SWDMA already */
153                 data &= ~(USD | MDM);
154                 data |= (dma_mode - XFER_MW_DMA_0) << 8;
155         }
156         pci_write_config_dword(dev, port, data);
157 }
158 
159 /**
160  *      sch_init_one - Register SCH ATA PCI device with kernel services
161  *      @pdev: PCI device to register
162  *      @ent: Entry in sch_pci_tbl matching with @pdev
163  *
164  *      LOCKING:
165  *      Inherited from PCI layer (may sleep).
166  *
167  *      RETURNS:
168  *      Zero on success, or -ERRNO value.
169  */
170 
171 static int sch_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
172 {
173         const struct ata_port_info *ppi[] = { &sch_port_info, NULL };
174 
175         ata_print_version_once(&pdev->dev, DRV_VERSION);
176 
177         return ata_pci_bmdma_init_one(pdev, ppi, &sch_sht, NULL, 0);
178 }
179 
180 module_pci_driver(sch_pci_driver);
181 

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