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Linux/drivers/ata/pata_triflex.c

  1 /*
  2  * pata_triflex.c       - Compaq PATA for new ATA layer
  3  *                        (C) 2005 Red Hat Inc
  4  *                        Alan Cox <alan@lxorguk.ukuu.org.uk>
  5  *
  6  * based upon
  7  *
  8  * triflex.c
  9  *
 10  * IDE Chipset driver for the Compaq TriFlex IDE controller.
 11  *
 12  * Known to work with the Compaq Workstation 5x00 series.
 13  *
 14  * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
 15  * Author: Torben Mathiasen <torben.mathiasen@hp.com>
 16  *
 17  * This program is free software; you can redistribute it and/or modify
 18  * it under the terms of the GNU General Public License version 2 as
 19  * published by the Free Software Foundation.
 20  *
 21  * This program is distributed in the hope that it will be useful,
 22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 24  * GNU General Public License for more details.
 25  *
 26  * You should have received a copy of the GNU General Public License
 27  * along with this program; if not, write to the Free Software
 28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 29  *
 30  * Loosely based on the piix & svwks drivers.
 31  *
 32  * Documentation:
 33  *      Not publicly available.
 34  */
 35 
 36 #include <linux/kernel.h>
 37 #include <linux/module.h>
 38 #include <linux/pci.h>
 39 #include <linux/init.h>
 40 #include <linux/blkdev.h>
 41 #include <linux/delay.h>
 42 #include <scsi/scsi_host.h>
 43 #include <linux/libata.h>
 44 
 45 #define DRV_NAME "pata_triflex"
 46 #define DRV_VERSION "0.2.8"
 47 
 48 /**
 49  *      triflex_prereset                -       probe begin
 50  *      @link: ATA link
 51  *      @deadline: deadline jiffies for the operation
 52  *
 53  *      Set up cable type and use generic probe init
 54  */
 55 
 56 static int triflex_prereset(struct ata_link *link, unsigned long deadline)
 57 {
 58         static const struct pci_bits triflex_enable_bits[] = {
 59                 { 0x80, 1, 0x01, 0x01 },
 60                 { 0x80, 1, 0x02, 0x02 }
 61         };
 62 
 63         struct ata_port *ap = link->ap;
 64         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 65 
 66         if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
 67                 return -ENOENT;
 68 
 69         return ata_sff_prereset(link, deadline);
 70 }
 71 
 72 
 73 
 74 /**
 75  *      triflex_load_timing             -       timing configuration
 76  *      @ap: ATA interface
 77  *      @adev: Device on the bus
 78  *      @speed: speed to configure
 79  *
 80  *      The Triflex has one set of timings per device per channel. This
 81  *      means we must do some switching. As the PIO and DMA timings don't
 82  *      match we have to do some reloading unlike PIIX devices where tuning
 83  *      tricks can avoid it.
 84  */
 85 
 86 static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
 87 {
 88         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 89         u32 timing = 0;
 90         u32 triflex_timing, old_triflex_timing;
 91         int channel_offset = ap->port_no ? 0x74: 0x70;
 92         unsigned int is_slave   = (adev->devno != 0);
 93 
 94 
 95         pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
 96         triflex_timing = old_triflex_timing;
 97 
 98         switch(speed)
 99         {
100                 case XFER_MW_DMA_2:
101                         timing = 0x0103;break;
102                 case XFER_MW_DMA_1:
103                         timing = 0x0203;break;
104                 case XFER_MW_DMA_0:
105                         timing = 0x0808;break;
106                 case XFER_SW_DMA_2:
107                 case XFER_SW_DMA_1:
108                 case XFER_SW_DMA_0:
109                         timing = 0x0F0F;break;
110                 case XFER_PIO_4:
111                         timing = 0x0202;break;
112                 case XFER_PIO_3:
113                         timing = 0x0204;break;
114                 case XFER_PIO_2:
115                         timing = 0x0404;break;
116                 case XFER_PIO_1:
117                         timing = 0x0508;break;
118                 case XFER_PIO_0:
119                         timing = 0x0808;break;
120                 default:
121                         BUG();
122         }
123         triflex_timing &= ~ (0xFFFF << (16 * is_slave));
124         triflex_timing |= (timing << (16 * is_slave));
125 
126         if (triflex_timing != old_triflex_timing)
127                 pci_write_config_dword(pdev, channel_offset, triflex_timing);
128 }
129 
130 /**
131  *      triflex_set_piomode     -       set initial PIO mode data
132  *      @ap: ATA interface
133  *      @adev: ATA device
134  *
135  *      Use the timing loader to set up the PIO mode. We have to do this
136  *      because DMA start/stop will only be called once DMA occurs. If there
137  *      has been no DMA then the PIO timings are still needed.
138  */
139 static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
140 {
141         triflex_load_timing(ap, adev, adev->pio_mode);
142 }
143 
144 /**
145  *      triflex_dma_start       -       DMA start callback
146  *      @qc: Command in progress
147  *
148  *      Usually drivers set the DMA timing at the point the set_dmamode call
149  *      is made. Triflex however requires we load new timings on the
150  *      transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
151  *      We load the DMA timings just before starting DMA and then restore
152  *      the PIO timing when the DMA is finished.
153  */
154 
155 static void triflex_bmdma_start(struct ata_queued_cmd *qc)
156 {
157         triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
158         ata_bmdma_start(qc);
159 }
160 
161 /**
162  *      triflex_dma_stop        -       DMA stop callback
163  *      @ap: ATA interface
164  *      @adev: ATA device
165  *
166  *      We loaded new timings in dma_start, as a result we need to restore
167  *      the PIO timings in dma_stop so that the next command issue gets the
168  *      right clock values.
169  */
170 
171 static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
172 {
173         ata_bmdma_stop(qc);
174         triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
175 }
176 
177 static struct scsi_host_template triflex_sht = {
178         ATA_BMDMA_SHT(DRV_NAME),
179 };
180 
181 static struct ata_port_operations triflex_port_ops = {
182         .inherits       = &ata_bmdma_port_ops,
183         .bmdma_start    = triflex_bmdma_start,
184         .bmdma_stop     = triflex_bmdma_stop,
185         .cable_detect   = ata_cable_40wire,
186         .set_piomode    = triflex_set_piomode,
187         .prereset       = triflex_prereset,
188 };
189 
190 static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
191 {
192         static const struct ata_port_info info = {
193                 .flags = ATA_FLAG_SLAVE_POSS,
194                 .pio_mask = ATA_PIO4,
195                 .mwdma_mask = ATA_MWDMA2,
196                 .port_ops = &triflex_port_ops
197         };
198         const struct ata_port_info *ppi[] = { &info, NULL };
199 
200         ata_print_version_once(&dev->dev, DRV_VERSION);
201 
202         return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
203 }
204 
205 static const struct pci_device_id triflex[] = {
206         { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
207 
208         { },
209 };
210 
211 #ifdef CONFIG_PM
212 static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
213 {
214         struct ata_host *host = pci_get_drvdata(pdev);
215         int rc = 0;
216 
217         rc = ata_host_suspend(host, mesg);
218         if (rc)
219                 return rc;
220 
221         /*
222          * We must not disable or powerdown the device.
223          * APM bios refuses to suspend if IDE is not accessible.
224          */
225         pci_save_state(pdev);
226 
227         return 0;
228 }
229 
230 #endif
231 
232 static struct pci_driver triflex_pci_driver = {
233         .name           = DRV_NAME,
234         .id_table       = triflex,
235         .probe          = triflex_init_one,
236         .remove         = ata_pci_remove_one,
237 #ifdef CONFIG_PM
238         .suspend        = triflex_ata_pci_device_suspend,
239         .resume         = ata_pci_device_resume,
240 #endif
241 };
242 
243 module_pci_driver(triflex_pci_driver);
244 
245 MODULE_AUTHOR("Alan Cox");
246 MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
247 MODULE_LICENSE("GPL");
248 MODULE_DEVICE_TABLE(pci, triflex);
249 MODULE_VERSION(DRV_VERSION);
250 

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