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Linux/drivers/ide/sc1200.c

  1 /*
  2  * Copyright (C) 2000-2002              Mark Lord <mlord@pobox.com>
  3  * Copyright (C)      2007              Bartlomiej Zolnierkiewicz
  4  *
  5  * May be copied or modified under the terms of the GNU General Public License
  6  *
  7  * Development of this chipset driver was funded
  8  * by the nice folks at National Semiconductor.
  9  *
 10  * Documentation:
 11  *      Available from National Semiconductor
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/types.h>
 16 #include <linux/kernel.h>
 17 #include <linux/slab.h>
 18 #include <linux/pci.h>
 19 #include <linux/init.h>
 20 #include <linux/ide.h>
 21 #include <linux/pm.h>
 22 
 23 #include <asm/io.h>
 24 
 25 #define DRV_NAME "sc1200"
 26 
 27 #define SC1200_REV_A    0x00
 28 #define SC1200_REV_B1   0x01
 29 #define SC1200_REV_B3   0x02
 30 #define SC1200_REV_C1   0x03
 31 #define SC1200_REV_D1   0x04
 32 
 33 #define PCI_CLK_33      0x00
 34 #define PCI_CLK_48      0x01
 35 #define PCI_CLK_66      0x02
 36 #define PCI_CLK_33A     0x03
 37 
 38 static unsigned short sc1200_get_pci_clock (void)
 39 {
 40         unsigned char chip_id, silicon_revision;
 41         unsigned int pci_clock;
 42         /*
 43          * Check the silicon revision, as not all versions of the chip
 44          * have the register with the fast PCI bus timings.
 45          */
 46         chip_id = inb (0x903c);
 47         silicon_revision = inb (0x903d);
 48 
 49         // Read the fast pci clock frequency
 50         if (chip_id == 0x04 && silicon_revision < SC1200_REV_B1) {
 51                 pci_clock = PCI_CLK_33;
 52         } else {
 53                 // check clock generator configuration (cfcc)
 54                 // the clock is in bits 8 and 9 of this word
 55 
 56                 pci_clock = inw (0x901e);
 57                 pci_clock >>= 8;
 58                 pci_clock &= 0x03;
 59                 if (pci_clock == PCI_CLK_33A)
 60                         pci_clock = PCI_CLK_33;
 61         }
 62         return pci_clock;
 63 }
 64 
 65 /*
 66  * Here are the standard PIO mode 0-4 timings for each "format".
 67  * Format-0 uses fast data reg timings, with slower command reg timings.
 68  * Format-1 uses fast timings for all registers, but won't work with all drives.
 69  */
 70 static const unsigned int sc1200_pio_timings[4][5] =
 71         {{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},  // format0  33Mhz
 72          {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010},  // format1, 33Mhz
 73          {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021},  // format1, 48Mhz
 74          {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}}; // format1, 66Mhz
 75 
 76 /*
 77  * After chip reset, the PIO timings are set to 0x00009172, which is not valid.
 78  */
 79 //#define SC1200_BAD_PIO(timings) (((timings)&~0x80000000)==0x00009172)
 80 
 81 static void sc1200_tunepio(ide_drive_t *drive, u8 pio)
 82 {
 83         ide_hwif_t *hwif = drive->hwif;
 84         struct pci_dev *pdev = to_pci_dev(hwif->dev);
 85         unsigned int basereg = hwif->channel ? 0x50 : 0x40, format = 0;
 86 
 87         pci_read_config_dword(pdev, basereg + 4, &format);
 88         format = (format >> 31) & 1;
 89         if (format)
 90                 format += sc1200_get_pci_clock();
 91         pci_write_config_dword(pdev, basereg + ((drive->dn & 1) << 3),
 92                                sc1200_pio_timings[format][pio]);
 93 }
 94 
 95 /*
 96  *      The SC1200 specifies that two drives sharing a cable cannot mix
 97  *      UDMA/MDMA.  It has to be one or the other, for the pair, though
 98  *      different timings can still be chosen for each drive.  We could
 99  *      set the appropriate timing bits on the fly, but that might be
100  *      a bit confusing.  So, for now we statically handle this requirement
101  *      by looking at our mate drive to see what it is capable of, before
102  *      choosing a mode for our own drive.
103  */
104 static u8 sc1200_udma_filter(ide_drive_t *drive)
105 {
106         ide_hwif_t *hwif = drive->hwif;
107         ide_drive_t *mate = ide_get_pair_dev(drive);
108         u16 *mateid;
109         u8 mask = hwif->ultra_mask;
110 
111         if (mate == NULL)
112                 goto out;
113         mateid = mate->id;
114 
115         if (ata_id_has_dma(mateid) && __ide_dma_bad_drive(mate) == 0) {
116                 if ((mateid[ATA_ID_FIELD_VALID] & 4) &&
117                     (mateid[ATA_ID_UDMA_MODES] & 7))
118                         goto out;
119                 if (mateid[ATA_ID_MWDMA_MODES] & 7)
120                         mask = 0;
121         }
122 out:
123         return mask;
124 }
125 
126 static void sc1200_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
127 {
128         struct pci_dev          *dev = to_pci_dev(hwif->dev);
129         unsigned int            reg, timings;
130         unsigned short          pci_clock;
131         unsigned int            basereg = hwif->channel ? 0x50 : 0x40;
132         const u8                mode = drive->dma_mode;
133 
134         static const u32 udma_timing[3][3] = {
135                 { 0x00921250, 0x00911140, 0x00911030 },
136                 { 0x00932470, 0x00922260, 0x00922140 },
137                 { 0x009436a1, 0x00933481, 0x00923261 },
138         };
139 
140         static const u32 mwdma_timing[3][3] = {
141                 { 0x00077771, 0x00012121, 0x00002020 },
142                 { 0x000bbbb2, 0x00024241, 0x00013131 },
143                 { 0x000ffff3, 0x00035352, 0x00015151 },
144         };
145 
146         pci_clock = sc1200_get_pci_clock();
147 
148         /*
149          * Note that each DMA mode has several timings associated with it.
150          * The correct timing depends on the fast PCI clock freq.
151          */
152 
153         if (mode >= XFER_UDMA_0)
154                 timings =  udma_timing[pci_clock][mode - XFER_UDMA_0];
155         else
156                 timings = mwdma_timing[pci_clock][mode - XFER_MW_DMA_0];
157 
158         if ((drive->dn & 1) == 0) {
159                 pci_read_config_dword(dev, basereg + 4, &reg);
160                 timings |= reg & 0x80000000;    /* preserve PIO format bit */
161                 pci_write_config_dword(dev, basereg + 4, timings);
162         } else
163                 pci_write_config_dword(dev, basereg + 12, timings);
164 }
165 
166 /*  Replacement for the standard ide_dma_end action in
167  *  dma_proc.
168  *
169  *  returns 1 on error, 0 otherwise
170  */
171 static int sc1200_dma_end(ide_drive_t *drive)
172 {
173         ide_hwif_t *hwif = drive->hwif;
174         unsigned long dma_base = hwif->dma_base;
175         u8 dma_stat;
176 
177         dma_stat = inb(dma_base+2);             /* get DMA status */
178 
179         if (!(dma_stat & 4))
180                 printk(" ide_dma_end dma_stat=%0x err=%x newerr=%x\n",
181                   dma_stat, ((dma_stat&7)!=4), ((dma_stat&2)==2));
182 
183         outb(dma_stat|0x1b, dma_base+2);        /* clear the INTR & ERROR bits */
184         outb(inb(dma_base)&~1, dma_base);       /* !! DO THIS HERE !! stop DMA */
185 
186         return (dma_stat & 7) != 4;             /* verify good DMA status */
187 }
188 
189 /*
190  * sc1200_set_pio_mode() handles setting of PIO modes
191  * for both the chipset and drive.
192  *
193  * All existing BIOSs for this chipset guarantee that all drives
194  * will have valid default PIO timings set up before we get here.
195  */
196 
197 static void sc1200_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
198 {
199         int             mode = -1;
200         const u8        pio = drive->pio_mode - XFER_PIO_0;
201 
202         /*
203          * bad abuse of ->set_pio_mode interface
204          */
205         switch (pio) {
206                 case 200: mode = XFER_UDMA_0;   break;
207                 case 201: mode = XFER_UDMA_1;   break;
208                 case 202: mode = XFER_UDMA_2;   break;
209                 case 100: mode = XFER_MW_DMA_0; break;
210                 case 101: mode = XFER_MW_DMA_1; break;
211                 case 102: mode = XFER_MW_DMA_2; break;
212         }
213         if (mode != -1) {
214                 printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
215                 ide_dma_off_quietly(drive);
216                 if (ide_set_dma_mode(drive, mode) == 0 &&
217                     (drive->dev_flags & IDE_DFLAG_USING_DMA))
218                         hwif->dma_ops->dma_host_set(drive, 1);
219                 return;
220         }
221 
222         sc1200_tunepio(drive, pio);
223 }
224 
225 #ifdef CONFIG_PM
226 struct sc1200_saved_state {
227         u32 regs[8];
228 };
229 
230 static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
231 {
232         printk("SC1200: suspend(%u)\n", state.event);
233 
234         /*
235          * we only save state when going from full power to less
236          */
237         if (state.event == PM_EVENT_ON) {
238                 struct ide_host *host = pci_get_drvdata(dev);
239                 struct sc1200_saved_state *ss = host->host_priv;
240                 unsigned int r;
241 
242                 /*
243                  * save timing registers
244                  * (this may be unnecessary if BIOS also does it)
245                  */
246                 for (r = 0; r < 8; r++)
247                         pci_read_config_dword(dev, 0x40 + r * 4, &ss->regs[r]);
248         }
249 
250         pci_disable_device(dev);
251         pci_set_power_state(dev, pci_choose_state(dev, state));
252         return 0;
253 }
254 
255 static int sc1200_resume (struct pci_dev *dev)
256 {
257         struct ide_host *host = pci_get_drvdata(dev);
258         struct sc1200_saved_state *ss = host->host_priv;
259         unsigned int r;
260         int i;
261 
262         i = pci_enable_device(dev);
263         if (i)
264                 return i;
265 
266         /*
267          * restore timing registers
268          * (this may be unnecessary if BIOS also does it)
269          */
270         for (r = 0; r < 8; r++)
271                 pci_write_config_dword(dev, 0x40 + r * 4, ss->regs[r]);
272 
273         return 0;
274 }
275 #endif
276 
277 static const struct ide_port_ops sc1200_port_ops = {
278         .set_pio_mode           = sc1200_set_pio_mode,
279         .set_dma_mode           = sc1200_set_dma_mode,
280         .udma_filter            = sc1200_udma_filter,
281 };
282 
283 static const struct ide_dma_ops sc1200_dma_ops = {
284         .dma_host_set           = ide_dma_host_set,
285         .dma_setup              = ide_dma_setup,
286         .dma_start              = ide_dma_start,
287         .dma_end                = sc1200_dma_end,
288         .dma_test_irq           = ide_dma_test_irq,
289         .dma_lost_irq           = ide_dma_lost_irq,
290         .dma_timer_expiry       = ide_dma_sff_timer_expiry,
291         .dma_sff_read_status    = ide_dma_sff_read_status,
292 };
293 
294 static const struct ide_port_info sc1200_chipset = {
295         .name           = DRV_NAME,
296         .port_ops       = &sc1200_port_ops,
297         .dma_ops        = &sc1200_dma_ops,
298         .host_flags     = IDE_HFLAG_SERIALIZE |
299                           IDE_HFLAG_POST_SET_MODE |
300                           IDE_HFLAG_ABUSE_DMA_MODES,
301         .pio_mask       = ATA_PIO4,
302         .mwdma_mask     = ATA_MWDMA2,
303         .udma_mask      = ATA_UDMA2,
304 };
305 
306 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
307 {
308         struct sc1200_saved_state *ss = NULL;
309         int rc;
310 
311 #ifdef CONFIG_PM
312         ss = kmalloc(sizeof(*ss), GFP_KERNEL);
313         if (ss == NULL)
314                 return -ENOMEM;
315 #endif
316         rc = ide_pci_init_one(dev, &sc1200_chipset, ss);
317         if (rc)
318                 kfree(ss);
319 
320         return rc;
321 }
322 
323 static const struct pci_device_id sc1200_pci_tbl[] = {
324         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), 0},
325         { 0, },
326 };
327 MODULE_DEVICE_TABLE(pci, sc1200_pci_tbl);
328 
329 static struct pci_driver sc1200_pci_driver = {
330         .name           = "SC1200_IDE",
331         .id_table       = sc1200_pci_tbl,
332         .probe          = sc1200_init_one,
333         .remove         = ide_pci_remove,
334 #ifdef CONFIG_PM
335         .suspend        = sc1200_suspend,
336         .resume         = sc1200_resume,
337 #endif
338 };
339 
340 static int __init sc1200_ide_init(void)
341 {
342         return ide_pci_register_driver(&sc1200_pci_driver);
343 }
344 
345 static void __exit sc1200_ide_exit(void)
346 {
347         pci_unregister_driver(&sc1200_pci_driver);
348 }
349 
350 module_init(sc1200_ide_init);
351 module_exit(sc1200_ide_exit);
352 
353 MODULE_AUTHOR("Mark Lord");
354 MODULE_DESCRIPTION("PCI driver module for NS SC1200 IDE");
355 MODULE_LICENSE("GPL");
356 

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