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Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6
[mv-sheeva.git] / drivers / ide / pci / it8213.c
1 /*
2  * ITE 8213 IDE driver
3  *
4  * Copyright (C) 2006 Jack Lee
5  * Copyright (C) 2006 Alan Cox
6  * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
7  */
8
9 #include <linux/kernel.h>
10 #include <linux/types.h>
11 #include <linux/module.h>
12 #include <linux/pci.h>
13 #include <linux/delay.h>
14 #include <linux/hdreg.h>
15 #include <linux/ide.h>
16 #include <linux/init.h>
17
18 #include <asm/io.h>
19
20 /**
21  *      it8213_dma_2_pio                -       return the PIO mode matching DMA
22  *      @xfer_rate: transfer speed
23  *
24  *      Returns the nearest equivalent PIO timing for the DMA
25  *      mode requested by the controller.
26  */
27
28 static u8 it8213_dma_2_pio (u8 xfer_rate) {
29         switch(xfer_rate) {
30                 case XFER_UDMA_6:
31                 case XFER_UDMA_5:
32                 case XFER_UDMA_4:
33                 case XFER_UDMA_3:
34                 case XFER_UDMA_2:
35                 case XFER_UDMA_1:
36                 case XFER_UDMA_0:
37                 case XFER_MW_DMA_2:
38                         return 4;
39                 case XFER_MW_DMA_1:
40                         return 3;
41                 case XFER_SW_DMA_2:
42                         return 2;
43                 case XFER_MW_DMA_0:
44                 case XFER_SW_DMA_1:
45                 case XFER_SW_DMA_0:
46                 default:
47                         return 0;
48         }
49 }
50
51 /*
52  *      it8213_tune_pio -       tune a drive
53  *      @drive: drive to tune
54  *      @pio: desired PIO mode
55  *
56  *      Set the interface PIO mode.
57  */
58
59 static void it8213_tune_pio(ide_drive_t *drive, const u8 pio)
60 {
61         ide_hwif_t *hwif        = HWIF(drive);
62         struct pci_dev *dev     = hwif->pci_dev;
63         int is_slave            = drive->dn & 1;
64         int master_port         = 0x40;
65         int slave_port          = 0x44;
66         unsigned long flags;
67         u16 master_data;
68         u8 slave_data;
69         static DEFINE_SPINLOCK(tune_lock);
70         int control = 0;
71
72         static const u8 timings[][2]= {
73                                         { 0, 0 },
74                                         { 0, 0 },
75                                         { 1, 0 },
76                                         { 2, 1 },
77                                         { 2, 3 }, };
78
79         spin_lock_irqsave(&tune_lock, flags);
80         pci_read_config_word(dev, master_port, &master_data);
81
82         if (pio > 1)
83                 control |= 1;   /* Programmable timing on */
84         if (drive->media != ide_disk)
85                 control |= 4;   /* ATAPI */
86         if (pio > 2)
87                 control |= 2;   /* IORDY */
88         if (is_slave) {
89                 master_data |=  0x4000;
90                 master_data &= ~0x0070;
91                 if (pio > 1)
92                         master_data = master_data | (control << 4);
93                 pci_read_config_byte(dev, slave_port, &slave_data);
94                 slave_data = slave_data & 0xf0;
95                 slave_data = slave_data | (timings[pio][0] << 2) | timings[pio][1];
96         } else {
97                 master_data &= ~0x3307;
98                 if (pio > 1)
99                         master_data = master_data | control;
100                 master_data = master_data | (timings[pio][0] << 12) | (timings[pio][1] << 8);
101         }
102         pci_write_config_word(dev, master_port, master_data);
103         if (is_slave)
104                 pci_write_config_byte(dev, slave_port, slave_data);
105         spin_unlock_irqrestore(&tune_lock, flags);
106 }
107
108 static void it8213_set_pio_mode(ide_drive_t *drive, const u8 pio)
109 {
110         it8213_tune_pio(drive, pio);
111         ide_config_drive_speed(drive, XFER_PIO_0 + pio);
112 }
113
114 /**
115  *      it8213_tune_chipset     -       set controller timings
116  *      @drive: Drive to set up
117  *      @speed: speed we want to achieve
118  *
119  *      Tune the ITE chipset for the desired mode.
120  */
121
122 static int it8213_tune_chipset(ide_drive_t *drive, const u8 speed)
123 {
124         ide_hwif_t *hwif        = HWIF(drive);
125         struct pci_dev *dev     = hwif->pci_dev;
126         u8 maslave              = 0x40;
127         int a_speed             = 3 << (drive->dn * 4);
128         int u_flag              = 1 << drive->dn;
129         int v_flag              = 0x01 << drive->dn;
130         int w_flag              = 0x10 << drive->dn;
131         int u_speed             = 0;
132         u16                     reg4042, reg4a;
133         u8                      reg48, reg54, reg55;
134
135         pci_read_config_word(dev, maslave, &reg4042);
136         pci_read_config_byte(dev, 0x48, &reg48);
137         pci_read_config_word(dev, 0x4a, &reg4a);
138         pci_read_config_byte(dev, 0x54, &reg54);
139         pci_read_config_byte(dev, 0x55, &reg55);
140
141         switch(speed) {
142                 case XFER_UDMA_6:
143                 case XFER_UDMA_4:
144                 case XFER_UDMA_2:       u_speed = 2 << (drive->dn * 4); break;
145                 case XFER_UDMA_5:
146                 case XFER_UDMA_3:
147                 case XFER_UDMA_1:       u_speed = 1 << (drive->dn * 4); break;
148                 case XFER_UDMA_0:       u_speed = 0 << (drive->dn * 4); break;
149                         break;
150                 case XFER_MW_DMA_2:
151                 case XFER_MW_DMA_1:
152                 case XFER_SW_DMA_2:
153                         break;
154                 default:
155                         return -1;
156         }
157
158         if (speed >= XFER_UDMA_0) {
159                 if (!(reg48 & u_flag))
160                         pci_write_config_byte(dev, 0x48, reg48 | u_flag);
161                 if (speed >= XFER_UDMA_5) {
162                         pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
163                 } else {
164                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
165                 }
166
167                 if ((reg4a & a_speed) != u_speed)
168                         pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
169                 if (speed > XFER_UDMA_2) {
170                         if (!(reg54 & v_flag))
171                                 pci_write_config_byte(dev, 0x54, reg54 | v_flag);
172                 } else
173                         pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
174         } else {
175                 if (reg48 & u_flag)
176                         pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
177                 if (reg4a & a_speed)
178                         pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
179                 if (reg54 & v_flag)
180                         pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
181                 if (reg55 & w_flag)
182                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
183         }
184
185         it8213_tune_pio(drive, it8213_dma_2_pio(speed));
186
187         return ide_config_drive_speed(drive, speed);
188 }
189
190 /**
191  *      it8213_configure_drive_for_dma  -       set up for DMA transfers
192  *      @drive: drive we are going to set up
193  *
194  *      Set up the drive for DMA, tune the controller and drive as
195  *      required. If the drive isn't suitable for DMA or we hit
196  *      other problems then we will drop down to PIO and set up
197  *      PIO appropriately
198  */
199
200 static int it8213_config_drive_for_dma (ide_drive_t *drive)
201 {
202         if (ide_tune_dma(drive))
203                 return 0;
204
205         ide_set_max_pio(drive);
206
207         return -1;
208 }
209
210 /**
211  *      init_hwif_it8213        -       set up hwif structs
212  *      @hwif: interface to set up
213  *
214  *      We do the basic set up of the interface structure. The IT8212
215  *      requires several custom handlers so we override the default
216  *      ide DMA handlers appropriately
217  */
218
219 static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
220 {
221         u8 reg42h = 0;
222
223         hwif->speedproc = &it8213_tune_chipset;
224         hwif->set_pio_mode = &it8213_set_pio_mode;
225
226         hwif->autodma = 0;
227
228         hwif->drives[0].autotune = 1;
229         hwif->drives[1].autotune = 1;
230
231         if (!hwif->dma_base)
232                 return;
233
234         hwif->atapi_dma = 1;
235         hwif->ultra_mask = 0x7f;
236         hwif->mwdma_mask = 0x06;
237         hwif->swdma_mask = 0x04;
238
239         pci_read_config_byte(hwif->pci_dev, 0x42, &reg42h);
240
241         hwif->ide_dma_check = &it8213_config_drive_for_dma;
242
243         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
244                 hwif->cbl = (reg42h & 0x02) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
245
246         /*
247          *      The BIOS often doesn't set up DMA on this controller
248          *      so we always do it.
249          */
250         if (!noautodma)
251                 hwif->autodma = 1;
252
253         hwif->drives[0].autodma = hwif->autodma;
254         hwif->drives[1].autodma = hwif->autodma;
255 }
256
257
258 #define DECLARE_ITE_DEV(name_str)                       \
259         {                                               \
260                 .name           = name_str,             \
261                 .init_hwif      = init_hwif_it8213,     \
262                 .autodma        = AUTODMA,              \
263                 .enablebits     = {{0x41,0x80,0x80}}, \
264                 .bootable       = ON_BOARD,             \
265                 .host_flags     = IDE_HFLAG_SINGLE,     \
266                 .pio_mask       = ATA_PIO4,             \
267         }
268
269 static ide_pci_device_t it8213_chipsets[] __devinitdata = {
270         /* 0 */ DECLARE_ITE_DEV("IT8213"),
271 };
272
273
274 /**
275  *      it8213_init_one -       pci layer discovery entry
276  *      @dev: PCI device
277  *      @id: ident table entry
278  *
279  *      Called by the PCI code when it finds an ITE8213 controller. As
280  *      this device follows the standard interfaces we can use the
281  *      standard helper functions to do almost all the work for us.
282  */
283
284 static int __devinit it8213_init_one(struct pci_dev *dev, const struct pci_device_id *id)
285 {
286         ide_setup_pci_device(dev, &it8213_chipsets[id->driver_data]);
287         return 0;
288 }
289
290
291 static struct pci_device_id it8213_pci_tbl[] = {
292         { PCI_VENDOR_ID_ITE, 0x8213, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
293         { 0, },
294 };
295
296 MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
297
298 static struct pci_driver driver = {
299         .name           = "ITE8213_IDE",
300         .id_table       = it8213_pci_tbl,
301         .probe          = it8213_init_one,
302 };
303
304 static int __init it8213_ide_init(void)
305 {
306         return ide_pci_register_driver(&driver);
307 }
308
309 module_init(it8213_ide_init);
310
311 MODULE_AUTHOR("Jack Lee, Alan Cox");
312 MODULE_DESCRIPTION("PCI driver module for the ITE 8213");
313 MODULE_LICENSE("GPL");