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Linux/drivers/ide/cy82c693.c

  1 /*
  2  *  Copyright (C) 1998-2000 Andreas S. Krebs (akrebs@altavista.net), Maintainer
  3  *  Copyright (C) 1998-2002 Andre Hedrick <andre@linux-ide.org>, Integrator
  4  *  Copyright (C) 2007-2011 Bartlomiej Zolnierkiewicz
  5  *
  6  * CYPRESS CY82C693 chipset IDE controller
  7  *
  8  * The CY82C693 chipset is used on Digital's PC-Alpha 164SX boards.
  9  */
 10 
 11 #include <linux/module.h>
 12 #include <linux/types.h>
 13 #include <linux/pci.h>
 14 #include <linux/ide.h>
 15 #include <linux/init.h>
 16 
 17 #include <asm/io.h>
 18 
 19 #define DRV_NAME "cy82c693"
 20 
 21 /*
 22  *      NOTE: the value for busmaster timeout is tricky and I got it by
 23  *      trial and error!  By using a to low value will cause DMA timeouts
 24  *      and drop IDE performance, and by using a to high value will cause
 25  *      audio playback to scatter.
 26  *      If you know a better value or how to calc it, please let me know.
 27  */
 28 
 29 /* twice the value written in cy82c693ub datasheet */
 30 #define BUSMASTER_TIMEOUT       0x50
 31 /*
 32  * the value above was tested on my machine and it seems to work okay
 33  */
 34 
 35 /* here are the offset definitions for the registers */
 36 #define CY82_IDE_CMDREG         0x04
 37 #define CY82_IDE_ADDRSETUP      0x48
 38 #define CY82_IDE_MASTER_IOR     0x4C
 39 #define CY82_IDE_MASTER_IOW     0x4D
 40 #define CY82_IDE_SLAVE_IOR      0x4E
 41 #define CY82_IDE_SLAVE_IOW      0x4F
 42 #define CY82_IDE_MASTER_8BIT    0x50
 43 #define CY82_IDE_SLAVE_8BIT     0x51
 44 
 45 #define CY82_INDEX_PORT         0x22
 46 #define CY82_DATA_PORT          0x23
 47 
 48 #define CY82_INDEX_CHANNEL0     0x30
 49 #define CY82_INDEX_CHANNEL1     0x31
 50 #define CY82_INDEX_TIMEOUT      0x32
 51 
 52 /*
 53  * set DMA mode a specific channel for CY82C693
 54  */
 55 
 56 static void cy82c693_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 57 {
 58         const u8 mode = drive->dma_mode;
 59         u8 single = (mode & 0x10) >> 4, index = 0, data = 0;
 60 
 61         index = hwif->channel ? CY82_INDEX_CHANNEL1 : CY82_INDEX_CHANNEL0;
 62 
 63         data = (mode & 3) | (single << 2);
 64 
 65         outb(index, CY82_INDEX_PORT);
 66         outb(data, CY82_DATA_PORT);
 67 
 68         /*
 69          * note: below we set the value for Bus Master IDE TimeOut Register
 70          * I'm not absolutely sure what this does, but it solved my problem
 71          * with IDE DMA and sound, so I now can play sound and work with
 72          * my IDE driver at the same time :-)
 73          *
 74          * If you know the correct (best) value for this register please
 75          * let me know - ASK
 76          */
 77 
 78         data = BUSMASTER_TIMEOUT;
 79         outb(CY82_INDEX_TIMEOUT, CY82_INDEX_PORT);
 80         outb(data, CY82_DATA_PORT);
 81 }
 82 
 83 static void cy82c693_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 84 {
 85         struct pci_dev *dev = to_pci_dev(hwif->dev);
 86         int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
 87         const unsigned long T = 1000000 / bus_speed;
 88         unsigned int addrCtrl;
 89         struct ide_timing t;
 90         u8 time_16, time_8;
 91 
 92         /* select primary or secondary channel */
 93         if (drive->dn > 1) {  /* drive is on the secondary channel */
 94                 dev = pci_get_slot(dev->bus, dev->devfn+1);
 95                 if (!dev) {
 96                         printk(KERN_ERR "%s: tune_drive: "
 97                                 "Cannot find secondary interface!\n",
 98                                 drive->name);
 99                         return;
100                 }
101         }
102 
103         ide_timing_compute(drive, drive->pio_mode, &t, T, 1);
104 
105         time_16 = clamp_val(t.recover - 1, 0, 15) |
106                   (clamp_val(t.active - 1, 0, 15) << 4);
107         time_8 = clamp_val(t.act8b - 1, 0, 15) |
108                  (clamp_val(t.rec8b - 1, 0, 15) << 4);
109 
110         /* now let's write  the clocks registers */
111         if ((drive->dn & 1) == 0) {
112                 /*
113                  * set master drive
114                  * address setup control register
115                  * is 32 bit !!!
116                  */
117                 pci_read_config_dword(dev, CY82_IDE_ADDRSETUP, &addrCtrl);
118 
119                 addrCtrl &= (~0xF);
120                 addrCtrl |= clamp_val(t.setup - 1, 0, 15);
121                 pci_write_config_dword(dev, CY82_IDE_ADDRSETUP, addrCtrl);
122 
123                 /* now let's set the remaining registers */
124                 pci_write_config_byte(dev, CY82_IDE_MASTER_IOR, time_16);
125                 pci_write_config_byte(dev, CY82_IDE_MASTER_IOW, time_16);
126                 pci_write_config_byte(dev, CY82_IDE_MASTER_8BIT, time_8);
127         } else {
128                 /*
129                  * set slave drive
130                  * address setup control register
131                  * is 32 bit !!!
132                  */
133                 pci_read_config_dword(dev, CY82_IDE_ADDRSETUP, &addrCtrl);
134 
135                 addrCtrl &= (~0xF0);
136                 addrCtrl |= (clamp_val(t.setup - 1, 0, 15) << 4);
137                 pci_write_config_dword(dev, CY82_IDE_ADDRSETUP, addrCtrl);
138 
139                 /* now let's set the remaining registers */
140                 pci_write_config_byte(dev, CY82_IDE_SLAVE_IOR, time_16);
141                 pci_write_config_byte(dev, CY82_IDE_SLAVE_IOW, time_16);
142                 pci_write_config_byte(dev, CY82_IDE_SLAVE_8BIT, time_8);
143         }
144         if (drive->dn > 1)
145                 pci_dev_put(dev);
146 }
147 
148 static void init_iops_cy82c693(ide_hwif_t *hwif)
149 {
150         static ide_hwif_t *primary;
151         struct pci_dev *dev = to_pci_dev(hwif->dev);
152 
153         if (PCI_FUNC(dev->devfn) == 1)
154                 primary = hwif;
155         else {
156                 hwif->mate = primary;
157                 hwif->channel = 1;
158         }
159 }
160 
161 static const struct ide_port_ops cy82c693_port_ops = {
162         .set_pio_mode           = cy82c693_set_pio_mode,
163         .set_dma_mode           = cy82c693_set_dma_mode,
164 };
165 
166 static const struct ide_port_info cy82c693_chipset = {
167         .name           = DRV_NAME,
168         .init_iops      = init_iops_cy82c693,
169         .port_ops       = &cy82c693_port_ops,
170         .host_flags     = IDE_HFLAG_SINGLE,
171         .pio_mask       = ATA_PIO4,
172         .swdma_mask     = ATA_SWDMA2,
173         .mwdma_mask     = ATA_MWDMA2,
174 };
175 
176 static int cy82c693_init_one(struct pci_dev *dev,
177                              const struct pci_device_id *id)
178 {
179         struct pci_dev *dev2;
180         int ret = -ENODEV;
181 
182         /* CY82C693 is more than only a IDE controller.
183            Function 1 is primary IDE channel, function 2 - secondary. */
184         if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
185             PCI_FUNC(dev->devfn) == 1) {
186                 dev2 = pci_get_slot(dev->bus, dev->devfn + 1);
187                 ret = ide_pci_init_two(dev, dev2, &cy82c693_chipset, NULL);
188                 if (ret)
189                         pci_dev_put(dev2);
190         }
191         return ret;
192 }
193 
194 static void cy82c693_remove(struct pci_dev *dev)
195 {
196         struct ide_host *host = pci_get_drvdata(dev);
197         struct pci_dev *dev2 = host->dev[1] ? to_pci_dev(host->dev[1]) : NULL;
198 
199         ide_pci_remove(dev);
200         pci_dev_put(dev2);
201 }
202 
203 static const struct pci_device_id cy82c693_pci_tbl[] = {
204         { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), 0 },
205         { 0, },
206 };
207 MODULE_DEVICE_TABLE(pci, cy82c693_pci_tbl);
208 
209 static struct pci_driver cy82c693_pci_driver = {
210         .name           = "Cypress_IDE",
211         .id_table       = cy82c693_pci_tbl,
212         .probe          = cy82c693_init_one,
213         .remove         = cy82c693_remove,
214         .suspend        = ide_pci_suspend,
215         .resume         = ide_pci_resume,
216 };
217 
218 static int __init cy82c693_ide_init(void)
219 {
220         return ide_pci_register_driver(&cy82c693_pci_driver);
221 }
222 
223 static void __exit cy82c693_ide_exit(void)
224 {
225         pci_unregister_driver(&cy82c693_pci_driver);
226 }
227 
228 module_init(cy82c693_ide_init);
229 module_exit(cy82c693_ide_exit);
230 
231 MODULE_AUTHOR("Andreas Krebs, Andre Hedrick, Bartlomiej Zolnierkiewicz");
232 MODULE_DESCRIPTION("PCI driver module for the Cypress CY82C693 IDE");
233 MODULE_LICENSE("GPL");
234 

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