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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/init.h>
 36 #include <linux/blkdev.h>
 37 #include <linux/delay.h>
 38 #include <scsi/scsi_host.h>
 39 #include <linux/libata.h>
 40 
 41 #define DRV_NAME        "pata_sc1200"
 42 #define DRV_VERSION     "0.2.6"
 43 
 44 #define SC1200_REV_A    0x00
 45 #define SC1200_REV_B1   0x01
 46 #define SC1200_REV_B3   0x02
 47 #define SC1200_REV_C1   0x03
 48 #define SC1200_REV_D1   0x04
 49 
 50 /**
 51  *      sc1200_clock    -       PCI clock
 52  *
 53  *      Return the PCI bus clocking for the SC1200 chipset configuration
 54  *      in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
 55  */
 56 
 57 static int sc1200_clock(void)
 58 {
 59         /* Magic registers that give us the chipset data */
 60         u8 chip_id = inb(0x903C);
 61         u8 silicon_rev = inb(0x903D);
 62         u16 pci_clock;
 63 
 64         if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
 65                 return 0;       /* 33 MHz mode */
 66 
 67         /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
 68            0/3 is 33Mhz 1 is 48 2 is 66 */
 69 
 70         pci_clock = inw(0x901E);
 71         pci_clock >>= 8;
 72         pci_clock &= 0x03;
 73         if (pci_clock == 3)
 74                 pci_clock = 0;
 75         return pci_clock;
 76 }
 77 
 78 /**
 79  *      sc1200_set_piomode              -       PIO setup
 80  *      @ap: ATA interface
 81  *      @adev: device on the interface
 82  *
 83  *      Set our PIO requirements. This is fairly simple on the SC1200
 84  */
 85 
 86 static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
 87 {
 88         static const u32 pio_timings[4][5] = {
 89                 /* format0, 33Mhz */
 90                 { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 },
 91                 /* format1, 33Mhz */
 92                 { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 },
 93                 /* format1, 48Mhz */
 94                 { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 },
 95                 /* format1, 66Mhz */
 96                 { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 }
 97         };
 98 
 99         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
100         u32 format;
101         unsigned int reg = 0x40 + 0x10 * ap->port_no;
102         int mode = adev->pio_mode - XFER_PIO_0;
103 
104         pci_read_config_dword(pdev, reg + 4, &format);
105         format >>= 31;
106         format += sc1200_clock();
107         pci_write_config_dword(pdev, reg + 8 * adev->devno,
108                                 pio_timings[format][mode]);
109 }
110 
111 /**
112  *      sc1200_set_dmamode              -       DMA timing setup
113  *      @ap: ATA interface
114  *      @adev: Device being configured
115  *
116  *      We cannot mix MWDMA and UDMA without reloading timings each switch
117  *      master to slave.
118  */
119 
120 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
121 {
122         static const u32 udma_timing[3][3] = {
123                 { 0x00921250, 0x00911140, 0x00911030 },
124                 { 0x00932470, 0x00922260, 0x00922140 },
125                 { 0x009436A1, 0x00933481, 0x00923261 }
126         };
127 
128         static const u32 mwdma_timing[3][3] = {
129                 { 0x00077771, 0x00012121, 0x00002020 },
130                 { 0x000BBBB2, 0x00024241, 0x00013131 },
131                 { 0x000FFFF3, 0x00035352, 0x00015151 }
132         };
133 
134         int clock = sc1200_clock();
135         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
136         unsigned int reg = 0x40 + 0x10 * ap->port_no;
137         int mode = adev->dma_mode;
138         u32 format;
139 
140         if (mode >= XFER_UDMA_0)
141                 format = udma_timing[clock][mode - XFER_UDMA_0];
142         else
143                 format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
144 
145         if (adev->devno == 0) {
146                 u32 timings;
147 
148                 pci_read_config_dword(pdev, reg + 4, &timings);
149                 timings &= 0x80000000UL;
150                 timings |= format;
151                 pci_write_config_dword(pdev, reg + 4, timings);
152         } else
153                 pci_write_config_dword(pdev, reg + 12, format);
154 }
155 
156 /**
157  *      sc1200_qc_issue         -       command issue
158  *      @qc: command pending
159  *
160  *      Called when the libata layer is about to issue a command. We wrap
161  *      this interface so that we can load the correct ATA timings if
162  *      necessary.  Specifically we have a problem that there is only
163  *      one MWDMA/UDMA bit.
164  */
165 
166 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
167 {
168         struct ata_port *ap = qc->ap;
169         struct ata_device *adev = qc->dev;
170         struct ata_device *prev = ap->private_data;
171 
172         /* See if the DMA settings could be wrong */
173         if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
174                 /* Maybe, but do the channels match MWDMA/UDMA ? */
175                 if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
176                     (ata_using_udma(prev) && !ata_using_udma(adev)))
177                         /* Switch the mode bits */
178                         sc1200_set_dmamode(ap, adev);
179         }
180 
181         return ata_bmdma_qc_issue(qc);
182 }
183 
184 /**
185  *      sc1200_qc_defer -       implement serialization
186  *      @qc: command
187  *
188  *      Serialize command issue on this controller.
189  */
190 
191 static int sc1200_qc_defer(struct ata_queued_cmd *qc)
192 {
193         struct ata_host *host = qc->ap->host;
194         struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
195         int rc;
196 
197         /* First apply the usual rules */
198         rc = ata_std_qc_defer(qc);
199         if (rc != 0)
200                 return rc;
201 
202         /* Now apply serialization rules. Only allow a command if the
203            other channel state machine is idle */
204         if (alt && alt->qc_active)
205                 return  ATA_DEFER_PORT;
206         return 0;
207 }
208 
209 static struct scsi_host_template sc1200_sht = {
210         ATA_BMDMA_SHT(DRV_NAME),
211         .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
212 };
213 
214 static struct ata_port_operations sc1200_port_ops = {
215         .inherits       = &ata_bmdma_port_ops,
216         .qc_prep        = ata_bmdma_dumb_qc_prep,
217         .qc_issue       = sc1200_qc_issue,
218         .qc_defer       = sc1200_qc_defer,
219         .cable_detect   = ata_cable_40wire,
220         .set_piomode    = sc1200_set_piomode,
221         .set_dmamode    = sc1200_set_dmamode,
222 };
223 
224 /**
225  *      sc1200_init_one         -       Initialise an SC1200
226  *      @dev: PCI device
227  *      @id: Entry in match table
228  *
229  *      Just throw the needed data at the libata helper and it does all
230  *      our work.
231  */
232 
233 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
234 {
235         static const struct ata_port_info info = {
236                 .flags = ATA_FLAG_SLAVE_POSS,
237                 .pio_mask = ATA_PIO4,
238                 .mwdma_mask = ATA_MWDMA2,
239                 .udma_mask = ATA_UDMA2,
240                 .port_ops = &sc1200_port_ops
241         };
242         const struct ata_port_info *ppi[] = { &info, NULL };
243 
244         return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
245 }
246 
247 static const struct pci_device_id sc1200[] = {
248         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
249 
250         { },
251 };
252 
253 static struct pci_driver sc1200_pci_driver = {
254         .name           = DRV_NAME,
255         .id_table       = sc1200,
256         .probe          = sc1200_init_one,
257         .remove         = ata_pci_remove_one,
258 #ifdef CONFIG_PM
259         .suspend        = ata_pci_device_suspend,
260         .resume         = ata_pci_device_resume,
261 #endif
262 };
263 
264 module_pci_driver(sc1200_pci_driver);
265 
266 MODULE_AUTHOR("Alan Cox, Mark Lord");
267 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
268 MODULE_LICENSE("GPL");
269 MODULE_DEVICE_TABLE(pci, sc1200);
270 MODULE_VERSION(DRV_VERSION);
271 

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