Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/ata/pata_sc1200.c

  1 /*
  2  * New ATA layer SC1200 driver          Alan Cox <alan@lxorguk.ukuu.org.uk>
  3  *
  4  * TODO: Mode selection filtering
  5  * TODO: Needs custom DMA cleanup code
  6  *
  7  * Based very heavily on
  8  *
  9  * linux/drivers/ide/pci/sc1200.c               Version 0.91    28-Jan-2003
 10  *
 11  * Copyright (C) 2000-2002              Mark Lord <mlord@pobox.com>
 12  * May be copied or modified under the terms of the GNU General Public License
 13  *
 14  * Development of this chipset driver was funded
 15  * by the nice folks at National Semiconductor.
 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  */
 31 
 32 #include <linux/kernel.h>
 33 #include <linux/module.h>
 34 #include <linux/pci.h>
 35 #include <linux/blkdev.h>
 36 #include <linux/delay.h>
 37 #include <scsi/scsi_host.h>
 38 #include <linux/libata.h>
 39 
 40 #define DRV_NAME        "pata_sc1200"
 41 #define DRV_VERSION     "0.2.6"
 42 
 43 #define SC1200_REV_A    0x00
 44 #define SC1200_REV_B1   0x01
 45 #define SC1200_REV_B3   0x02
 46 #define SC1200_REV_C1   0x03
 47 #define SC1200_REV_D1   0x04
 48 
 49 /**
 50  *      sc1200_clock    -       PCI clock
 51  *
 52  *      Return the PCI bus clocking for the SC1200 chipset configuration
 53  *      in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
 54  */
 55 
 56 static int sc1200_clock(void)
 57 {
 58         /* Magic registers that give us the chipset data */
 59         u8 chip_id = inb(0x903C);
 60         u8 silicon_rev = inb(0x903D);
 61         u16 pci_clock;
 62 
 63         if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
 64                 return 0;       /* 33 MHz mode */
 65 
 66         /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
 67            0/3 is 33Mhz 1 is 48 2 is 66 */
 68 
 69         pci_clock = inw(0x901E);
 70         pci_clock >>= 8;
 71         pci_clock &= 0x03;
 72         if (pci_clock == 3)
 73                 pci_clock = 0;
 74         return pci_clock;
 75 }
 76 
 77 /**
 78  *      sc1200_set_piomode              -       PIO setup
 79  *      @ap: ATA interface
 80  *      @adev: device on the interface
 81  *
 82  *      Set our PIO requirements. This is fairly simple on the SC1200
 83  */
 84 
 85 static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
 86 {
 87         static const u32 pio_timings[4][5] = {
 88                 /* format0, 33Mhz */
 89                 { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 },
 90                 /* format1, 33Mhz */
 91                 { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 },
 92                 /* format1, 48Mhz */
 93                 { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 },
 94                 /* format1, 66Mhz */
 95                 { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 }
 96         };
 97 
 98         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 99         u32 format;
100         unsigned int reg = 0x40 + 0x10 * ap->port_no;
101         int mode = adev->pio_mode - XFER_PIO_0;
102 
103         pci_read_config_dword(pdev, reg + 4, &format);
104         format >>= 31;
105         format += sc1200_clock();
106         pci_write_config_dword(pdev, reg + 8 * adev->devno,
107                                 pio_timings[format][mode]);
108 }
109 
110 /**
111  *      sc1200_set_dmamode              -       DMA timing setup
112  *      @ap: ATA interface
113  *      @adev: Device being configured
114  *
115  *      We cannot mix MWDMA and UDMA without reloading timings each switch
116  *      master to slave.
117  */
118 
119 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
120 {
121         static const u32 udma_timing[3][3] = {
122                 { 0x00921250, 0x00911140, 0x00911030 },
123                 { 0x00932470, 0x00922260, 0x00922140 },
124                 { 0x009436A1, 0x00933481, 0x00923261 }
125         };
126 
127         static const u32 mwdma_timing[3][3] = {
128                 { 0x00077771, 0x00012121, 0x00002020 },
129                 { 0x000BBBB2, 0x00024241, 0x00013131 },
130                 { 0x000FFFF3, 0x00035352, 0x00015151 }
131         };
132 
133         int clock = sc1200_clock();
134         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
135         unsigned int reg = 0x40 + 0x10 * ap->port_no;
136         int mode = adev->dma_mode;
137         u32 format;
138 
139         if (mode >= XFER_UDMA_0)
140                 format = udma_timing[clock][mode - XFER_UDMA_0];
141         else
142                 format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
143 
144         if (adev->devno == 0) {
145                 u32 timings;
146 
147                 pci_read_config_dword(pdev, reg + 4, &timings);
148                 timings &= 0x80000000UL;
149                 timings |= format;
150                 pci_write_config_dword(pdev, reg + 4, timings);
151         } else
152                 pci_write_config_dword(pdev, reg + 12, format);
153 }
154 
155 /**
156  *      sc1200_qc_issue         -       command issue
157  *      @qc: command pending
158  *
159  *      Called when the libata layer is about to issue a command. We wrap
160  *      this interface so that we can load the correct ATA timings if
161  *      necessary.  Specifically we have a problem that there is only
162  *      one MWDMA/UDMA bit.
163  */
164 
165 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
166 {
167         struct ata_port *ap = qc->ap;
168         struct ata_device *adev = qc->dev;
169         struct ata_device *prev = ap->private_data;
170 
171         /* See if the DMA settings could be wrong */
172         if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
173                 /* Maybe, but do the channels match MWDMA/UDMA ? */
174                 if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
175                     (ata_using_udma(prev) && !ata_using_udma(adev)))
176                         /* Switch the mode bits */
177                         sc1200_set_dmamode(ap, adev);
178         }
179 
180         return ata_bmdma_qc_issue(qc);
181 }
182 
183 /**
184  *      sc1200_qc_defer -       implement serialization
185  *      @qc: command
186  *
187  *      Serialize command issue on this controller.
188  */
189 
190 static int sc1200_qc_defer(struct ata_queued_cmd *qc)
191 {
192         struct ata_host *host = qc->ap->host;
193         struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
194         int rc;
195 
196         /* First apply the usual rules */
197         rc = ata_std_qc_defer(qc);
198         if (rc != 0)
199                 return rc;
200 
201         /* Now apply serialization rules. Only allow a command if the
202            other channel state machine is idle */
203         if (alt && alt->qc_active)
204                 return  ATA_DEFER_PORT;
205         return 0;
206 }
207 
208 static struct scsi_host_template sc1200_sht = {
209         ATA_BMDMA_SHT(DRV_NAME),
210         .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
211 };
212 
213 static struct ata_port_operations sc1200_port_ops = {
214         .inherits       = &ata_bmdma_port_ops,
215         .qc_prep        = ata_bmdma_dumb_qc_prep,
216         .qc_issue       = sc1200_qc_issue,
217         .qc_defer       = sc1200_qc_defer,
218         .cable_detect   = ata_cable_40wire,
219         .set_piomode    = sc1200_set_piomode,
220         .set_dmamode    = sc1200_set_dmamode,
221 };
222 
223 /**
224  *      sc1200_init_one         -       Initialise an SC1200
225  *      @dev: PCI device
226  *      @id: Entry in match table
227  *
228  *      Just throw the needed data at the libata helper and it does all
229  *      our work.
230  */
231 
232 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
233 {
234         static const struct ata_port_info info = {
235                 .flags = ATA_FLAG_SLAVE_POSS,
236                 .pio_mask = ATA_PIO4,
237                 .mwdma_mask = ATA_MWDMA2,
238                 .udma_mask = ATA_UDMA2,
239                 .port_ops = &sc1200_port_ops
240         };
241         const struct ata_port_info *ppi[] = { &info, NULL };
242 
243         return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
244 }
245 
246 static const struct pci_device_id sc1200[] = {
247         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
248 
249         { },
250 };
251 
252 static struct pci_driver sc1200_pci_driver = {
253         .name           = DRV_NAME,
254         .id_table       = sc1200,
255         .probe          = sc1200_init_one,
256         .remove         = ata_pci_remove_one,
257 #ifdef CONFIG_PM_SLEEP
258         .suspend        = ata_pci_device_suspend,
259         .resume         = ata_pci_device_resume,
260 #endif
261 };
262 
263 module_pci_driver(sc1200_pci_driver);
264 
265 MODULE_AUTHOR("Alan Cox, Mark Lord");
266 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
267 MODULE_LICENSE("GPL");
268 MODULE_DEVICE_TABLE(pci, sc1200);
269 MODULE_VERSION(DRV_VERSION);
270 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us