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Linux/drivers/ide/tc86c001.c

  1 /*
  2  * Copyright (C) 2002 Toshiba Corporation
  3  * Copyright (C) 2005-2006 MontaVista Software, Inc. <source@mvista.com>
  4  *
  5  * This file is licensed under the terms of the GNU General Public
  6  * License version 2.  This program is licensed "as is" without any
  7  * warranty of any kind, whether express or implied.
  8  */
  9 
 10 #include <linux/types.h>
 11 #include <linux/pci.h>
 12 #include <linux/ide.h>
 13 #include <linux/module.h>
 14 
 15 #define DRV_NAME "tc86c001"
 16 
 17 static void tc86c001_set_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 18 {
 19         unsigned long scr_port  = hwif->config_data + (drive->dn ? 0x02 : 0x00);
 20         u16 mode, scr           = inw(scr_port);
 21         const u8 speed          = drive->dma_mode;
 22 
 23         switch (speed) {
 24         case XFER_UDMA_4:       mode = 0x00c0; break;
 25         case XFER_UDMA_3:       mode = 0x00b0; break;
 26         case XFER_UDMA_2:       mode = 0x00a0; break;
 27         case XFER_UDMA_1:       mode = 0x0090; break;
 28         case XFER_UDMA_0:       mode = 0x0080; break;
 29         case XFER_MW_DMA_2:     mode = 0x0070; break;
 30         case XFER_MW_DMA_1:     mode = 0x0060; break;
 31         case XFER_MW_DMA_0:     mode = 0x0050; break;
 32         case XFER_PIO_4:        mode = 0x0400; break;
 33         case XFER_PIO_3:        mode = 0x0300; break;
 34         case XFER_PIO_2:        mode = 0x0200; break;
 35         case XFER_PIO_1:        mode = 0x0100; break;
 36         case XFER_PIO_0:
 37         default:                mode = 0x0000; break;
 38         }
 39 
 40         scr &= (speed < XFER_MW_DMA_0) ? 0xf8ff : 0xff0f;
 41         scr |= mode;
 42         outw(scr, scr_port);
 43 }
 44 
 45 static void tc86c001_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 46 {
 47         drive->dma_mode = drive->pio_mode;
 48         tc86c001_set_mode(hwif, drive);
 49 }
 50 
 51 /*
 52  * HACKITY HACK
 53  *
 54  * This is a workaround for the limitation 5 of the TC86C001 IDE controller:
 55  * if a DMA transfer terminates prematurely, the controller leaves the device's
 56  * interrupt request (INTRQ) pending and does not generate a PCI interrupt (or
 57  * set the interrupt bit in the DMA status register), thus no PCI interrupt
 58  * will occur until a DMA transfer has been successfully completed.
 59  *
 60  * We work around this by initiating dummy, zero-length DMA transfer on
 61  * a DMA timeout expiration. I found no better way to do this with the current
 62  * IDE core than to temporarily replace a higher level driver's timer expiry
 63  * handler with our own backing up to that handler in case our recovery fails.
 64  */
 65 static int tc86c001_timer_expiry(ide_drive_t *drive)
 66 {
 67         ide_hwif_t *hwif        = drive->hwif;
 68         ide_expiry_t *expiry    = ide_get_hwifdata(hwif);
 69         u8 dma_stat             = inb(hwif->dma_base + ATA_DMA_STATUS);
 70 
 71         /* Restore a higher level driver's expiry handler first. */
 72         hwif->expiry = expiry;
 73 
 74         if ((dma_stat & 5) == 1) {      /* DMA active and no interrupt */
 75                 unsigned long sc_base   = hwif->config_data;
 76                 unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
 77                 u8 dma_cmd              = inb(hwif->dma_base + ATA_DMA_CMD);
 78 
 79                 printk(KERN_WARNING "%s: DMA interrupt possibly stuck, "
 80                        "attempting recovery...\n", drive->name);
 81 
 82                 /* Stop DMA */
 83                 outb(dma_cmd & ~0x01, hwif->dma_base + ATA_DMA_CMD);
 84 
 85                 /* Setup the dummy DMA transfer */
 86                 outw(0, sc_base + 0x0a);        /* Sector Count */
 87                 outw(0, twcr_port);     /* Transfer Word Count 1 or 2 */
 88 
 89                 /* Start the dummy DMA transfer */
 90 
 91                 /* clear R_OR_WCTR for write */
 92                 outb(0x00, hwif->dma_base + ATA_DMA_CMD);
 93                 /* set START_STOPBM */
 94                 outb(0x01, hwif->dma_base + ATA_DMA_CMD);
 95 
 96                 /*
 97                  * If an interrupt was pending, it should come thru shortly.
 98                  * If not, a higher level driver's expiry handler should
 99                  * eventually cause some kind of recovery from the DMA stall.
100                  */
101                 return WAIT_MIN_SLEEP;
102         }
103 
104         /* Chain to the restored expiry handler if DMA wasn't active. */
105         if (likely(expiry != NULL))
106                 return expiry(drive);
107 
108         /* If there was no handler, "emulate" that for ide_timer_expiry()... */
109         return -1;
110 }
111 
112 static void tc86c001_dma_start(ide_drive_t *drive)
113 {
114         ide_hwif_t *hwif        = drive->hwif;
115         unsigned long sc_base   = hwif->config_data;
116         unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
117         unsigned long nsectors  = blk_rq_sectors(hwif->rq);
118 
119         /*
120          * We have to manually load the sector count and size into
121          * the appropriate system control registers for DMA to work
122          * with LBA48 and ATAPI devices...
123          */
124         outw(nsectors, sc_base + 0x0a); /* Sector Count */
125         outw(SECTOR_SIZE / 2, twcr_port); /* Transfer Word Count 1/2 */
126 
127         /* Install our timeout expiry hook, saving the current handler... */
128         ide_set_hwifdata(hwif, hwif->expiry);
129         hwif->expiry = &tc86c001_timer_expiry;
130 
131         ide_dma_start(drive);
132 }
133 
134 static u8 tc86c001_cable_detect(ide_hwif_t *hwif)
135 {
136         struct pci_dev *dev = to_pci_dev(hwif->dev);
137         unsigned long sc_base = pci_resource_start(dev, 5);
138         u16 scr1 = inw(sc_base + 0x00);
139 
140         /*
141          * System Control  1 Register bit 13 (PDIAGN):
142          * 0=80-pin cable, 1=40-pin cable
143          */
144         return (scr1 & 0x2000) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
145 }
146 
147 static void init_hwif_tc86c001(ide_hwif_t *hwif)
148 {
149         struct pci_dev *dev     = to_pci_dev(hwif->dev);
150         unsigned long sc_base   = pci_resource_start(dev, 5);
151         u16 scr1                = inw(sc_base + 0x00);
152 
153         /* System Control 1 Register bit 15 (Soft Reset) set */
154         outw(scr1 |  0x8000, sc_base + 0x00);
155 
156         /* System Control 1 Register bit 14 (FIFO Reset) set */
157         outw(scr1 |  0x4000, sc_base + 0x00);
158 
159         /* System Control 1 Register: reset clear */
160         outw(scr1 & ~0xc000, sc_base + 0x00);
161 
162         /* Store the system control register base for convenience... */
163         hwif->config_data = sc_base;
164 
165         if (!hwif->dma_base)
166                 return;
167 
168         /*
169          * Sector Count Control Register bits 0 and 1 set:
170          * software sets Sector Count Register for master and slave device
171          */
172         outw(0x0003, sc_base + 0x0c);
173 
174         /* Sector Count Register limit */
175         hwif->rqsize     = 0xffff;
176 }
177 
178 static const struct ide_port_ops tc86c001_port_ops = {
179         .set_pio_mode           = tc86c001_set_pio_mode,
180         .set_dma_mode           = tc86c001_set_mode,
181         .cable_detect           = tc86c001_cable_detect,
182 };
183 
184 static const struct ide_dma_ops tc86c001_dma_ops = {
185         .dma_host_set           = ide_dma_host_set,
186         .dma_setup              = ide_dma_setup,
187         .dma_start              = tc86c001_dma_start,
188         .dma_end                = ide_dma_end,
189         .dma_test_irq           = ide_dma_test_irq,
190         .dma_lost_irq           = ide_dma_lost_irq,
191         .dma_timer_expiry       = ide_dma_sff_timer_expiry,
192         .dma_sff_read_status    = ide_dma_sff_read_status,
193 };
194 
195 static const struct ide_port_info tc86c001_chipset = {
196         .name           = DRV_NAME,
197         .init_hwif      = init_hwif_tc86c001,
198         .port_ops       = &tc86c001_port_ops,
199         .dma_ops        = &tc86c001_dma_ops,
200         .host_flags     = IDE_HFLAG_SINGLE | IDE_HFLAG_OFF_BOARD,
201         .pio_mask       = ATA_PIO4,
202         .mwdma_mask     = ATA_MWDMA2,
203         .udma_mask      = ATA_UDMA4,
204 };
205 
206 static int tc86c001_init_one(struct pci_dev *dev,
207                              const struct pci_device_id *id)
208 {
209         int rc;
210 
211         rc = pci_enable_device(dev);
212         if (rc)
213                 goto out;
214 
215         rc = pci_request_region(dev, 5, DRV_NAME);
216         if (rc) {
217                 printk(KERN_ERR DRV_NAME ": system control regs already in use");
218                 goto out_disable;
219         }
220 
221         rc = ide_pci_init_one(dev, &tc86c001_chipset, NULL);
222         if (rc)
223                 goto out_release;
224 
225         goto out;
226 
227 out_release:
228         pci_release_region(dev, 5);
229 out_disable:
230         pci_disable_device(dev);
231 out:
232         return rc;
233 }
234 
235 static void tc86c001_remove(struct pci_dev *dev)
236 {
237         ide_pci_remove(dev);
238         pci_release_region(dev, 5);
239         pci_disable_device(dev);
240 }
241 
242 static const struct pci_device_id tc86c001_pci_tbl[] = {
243         { PCI_VDEVICE(TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_IDE), 0 },
244         { 0, }
245 };
246 MODULE_DEVICE_TABLE(pci, tc86c001_pci_tbl);
247 
248 static struct pci_driver tc86c001_pci_driver = {
249         .name           = "TC86C001",
250         .id_table       = tc86c001_pci_tbl,
251         .probe          = tc86c001_init_one,
252         .remove         = tc86c001_remove,
253 };
254 
255 static int __init tc86c001_ide_init(void)
256 {
257         return ide_pci_register_driver(&tc86c001_pci_driver);
258 }
259 
260 static void __exit tc86c001_ide_exit(void)
261 {
262         pci_unregister_driver(&tc86c001_pci_driver);
263 }
264 
265 module_init(tc86c001_ide_init);
266 module_exit(tc86c001_ide_exit);
267 
268 MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
269 MODULE_DESCRIPTION("PCI driver module for TC86C001 IDE");
270 MODULE_LICENSE("GPL");
271 

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