Commit | Line | Data |
---|---|---|
669a5db4 | 1 | /* |
ab771630 | 2 | * New ATA layer SC1200 driver Alan Cox <alan@lxorguk.ukuu.org.uk> |
669a5db4 JG |
3 | * |
4 | * TODO: Mode selection filtering | |
669a5db4 JG |
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 | |
85cd7251 | 29 | * |
669a5db4 JG |
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 "sc1200" | |
2a3103ce | 42 | #define DRV_VERSION "0.2.6" |
669a5db4 JG |
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 | */ | |
85cd7251 | 56 | |
669a5db4 JG |
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; | |
85cd7251 | 63 | |
669a5db4 JG |
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 | */ | |
85cd7251 | 85 | |
669a5db4 JG |
86 | static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev) |
87 | { | |
88 | static const u32 pio_timings[4][5] = { | |
89 | {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz | |
90 | {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz | |
91 | {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz | |
92 | {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131} // format1, 66Mhz | |
93 | }; | |
94 | ||
95 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
96 | u32 format; | |
97 | unsigned int reg = 0x40 + 0x10 * ap->port_no; | |
98 | int mode = adev->pio_mode - XFER_PIO_0; | |
85cd7251 | 99 | |
669a5db4 JG |
100 | pci_read_config_dword(pdev, reg + 4, &format); |
101 | format >>= 31; | |
102 | format += sc1200_clock(); | |
85cd7251 | 103 | pci_write_config_dword(pdev, reg + 8 * adev->devno, |
669a5db4 JG |
104 | pio_timings[format][mode]); |
105 | } | |
106 | ||
107 | /** | |
108 | * sc1200_set_dmamode - DMA timing setup | |
109 | * @ap: ATA interface | |
110 | * @adev: Device being configured | |
111 | * | |
112 | * We cannot mix MWDMA and UDMA without reloading timings each switch | |
113 | * master to slave. | |
114 | */ | |
85cd7251 | 115 | |
669a5db4 JG |
116 | static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev) |
117 | { | |
118 | static const u32 udma_timing[3][3] = { | |
119 | { 0x00921250, 0x00911140, 0x00911030 }, | |
120 | { 0x00932470, 0x00922260, 0x00922140 }, | |
121 | { 0x009436A1, 0x00933481, 0x00923261 } | |
122 | }; | |
85cd7251 | 123 | |
669a5db4 JG |
124 | static const u32 mwdma_timing[3][3] = { |
125 | { 0x00077771, 0x00012121, 0x00002020 }, | |
126 | { 0x000BBBB2, 0x00024241, 0x00013131 }, | |
127 | { 0x000FFFF3, 0x00035352, 0x00015151 } | |
128 | }; | |
85cd7251 | 129 | |
669a5db4 JG |
130 | int clock = sc1200_clock(); |
131 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
132 | unsigned int reg = 0x40 + 0x10 * ap->port_no; | |
133 | int mode = adev->dma_mode; | |
134 | u32 format; | |
135 | ||
136 | if (mode >= XFER_UDMA_0) | |
137 | format = udma_timing[clock][mode - XFER_UDMA_0]; | |
138 | else | |
139 | format = mwdma_timing[clock][mode - XFER_MW_DMA_0]; | |
85cd7251 | 140 | |
669a5db4 JG |
141 | if (adev->devno == 0) { |
142 | u32 timings; | |
85cd7251 | 143 | |
669a5db4 JG |
144 | pci_read_config_dword(pdev, reg + 4, &timings); |
145 | timings &= 0x80000000UL; | |
146 | timings |= format; | |
147 | pci_write_config_dword(pdev, reg + 4, timings); | |
148 | } else | |
149 | pci_write_config_dword(pdev, reg + 12, format); | |
150 | } | |
151 | ||
152 | /** | |
9363c382 | 153 | * sc1200_qc_issue - command issue |
669a5db4 JG |
154 | * @qc: command pending |
155 | * | |
156 | * Called when the libata layer is about to issue a command. We wrap | |
157 | * this interface so that we can load the correct ATA timings if | |
3a4fa0a2 | 158 | * necessary. Specifically we have a problem that there is only |
669a5db4 JG |
159 | * one MWDMA/UDMA bit. |
160 | */ | |
161 | ||
9363c382 | 162 | static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc) |
669a5db4 JG |
163 | { |
164 | struct ata_port *ap = qc->ap; | |
165 | struct ata_device *adev = qc->dev; | |
166 | struct ata_device *prev = ap->private_data; | |
167 | ||
168 | /* See if the DMA settings could be wrong */ | |
b15b3eba | 169 | if (ata_dma_enabled(adev) && adev != prev && prev != NULL) { |
669a5db4 | 170 | /* Maybe, but do the channels match MWDMA/UDMA ? */ |
b15b3eba AC |
171 | if ((ata_using_udma(adev) && !ata_using_udma(prev)) || |
172 | (ata_using_udma(prev) && !ata_using_udma(adev))) | |
669a5db4 JG |
173 | /* Switch the mode bits */ |
174 | sc1200_set_dmamode(ap, adev); | |
175 | } | |
176 | ||
9363c382 | 177 | return ata_sff_qc_issue(qc); |
669a5db4 JG |
178 | } |
179 | ||
c0f2ee34 AC |
180 | /** |
181 | * sc1200_qc_defer - implement serialization | |
182 | * @qc: command | |
183 | * | |
184 | * Serialize command issue on this controller. | |
185 | */ | |
186 | ||
187 | static int sc1200_qc_defer(struct ata_queued_cmd *qc) | |
188 | { | |
189 | struct ata_host *host = qc->ap->host; | |
190 | struct ata_port *alt = host->ports[1 ^ qc->ap->port_no]; | |
191 | int rc; | |
192 | ||
193 | /* First apply the usual rules */ | |
194 | rc = ata_std_qc_defer(qc); | |
195 | if (rc != 0) | |
196 | return rc; | |
197 | ||
198 | /* Now apply serialization rules. Only allow a command if the | |
199 | other channel state machine is idle */ | |
200 | if (alt && alt->qc_active) | |
201 | return ATA_DEFER_PORT; | |
202 | return 0; | |
203 | } | |
204 | ||
669a5db4 | 205 | static struct scsi_host_template sc1200_sht = { |
68d1d07b TH |
206 | ATA_BMDMA_SHT(DRV_NAME), |
207 | .sg_tablesize = LIBATA_DUMB_MAX_PRD, | |
669a5db4 JG |
208 | }; |
209 | ||
210 | static struct ata_port_operations sc1200_port_ops = { | |
029cfd6b | 211 | .inherits = &ata_bmdma_port_ops, |
9363c382 TH |
212 | .qc_prep = ata_sff_dumb_qc_prep, |
213 | .qc_issue = sc1200_qc_issue, | |
c0f2ee34 | 214 | .qc_defer = sc1200_qc_defer, |
029cfd6b TH |
215 | .cable_detect = ata_cable_40wire, |
216 | .set_piomode = sc1200_set_piomode, | |
217 | .set_dmamode = sc1200_set_dmamode, | |
85cd7251 | 218 | }; |
669a5db4 JG |
219 | |
220 | /** | |
221 | * sc1200_init_one - Initialise an SC1200 | |
222 | * @dev: PCI device | |
223 | * @id: Entry in match table | |
224 | * | |
225 | * Just throw the needed data at the libata helper and it does all | |
226 | * our work. | |
227 | */ | |
85cd7251 | 228 | |
669a5db4 JG |
229 | static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
230 | { | |
1626aeb8 | 231 | static const struct ata_port_info info = { |
1d2808fd | 232 | .flags = ATA_FLAG_SLAVE_POSS, |
14bdef98 EIB |
233 | .pio_mask = ATA_PIO4, |
234 | .mwdma_mask = ATA_MWDMA2, | |
235 | .udma_mask = ATA_UDMA2, | |
669a5db4 JG |
236 | .port_ops = &sc1200_port_ops |
237 | }; | |
6d4f950e | 238 | const struct ata_port_info *ppi[] = { &info, NULL }; |
1626aeb8 | 239 | |
9363c382 | 240 | return ata_pci_sff_init_one(dev, ppi, &sc1200_sht, NULL); |
669a5db4 JG |
241 | } |
242 | ||
2d2744fc JG |
243 | static const struct pci_device_id sc1200[] = { |
244 | { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), }, | |
245 | ||
246 | { }, | |
669a5db4 JG |
247 | }; |
248 | ||
249 | static struct pci_driver sc1200_pci_driver = { | |
2d2744fc | 250 | .name = DRV_NAME, |
669a5db4 JG |
251 | .id_table = sc1200, |
252 | .probe = sc1200_init_one, | |
30ced0f0 | 253 | .remove = ata_pci_remove_one, |
438ac6d5 | 254 | #ifdef CONFIG_PM |
30ced0f0 A |
255 | .suspend = ata_pci_device_suspend, |
256 | .resume = ata_pci_device_resume, | |
438ac6d5 | 257 | #endif |
669a5db4 JG |
258 | }; |
259 | ||
260 | static int __init sc1200_init(void) | |
261 | { | |
262 | return pci_register_driver(&sc1200_pci_driver); | |
263 | } | |
264 | ||
669a5db4 JG |
265 | static void __exit sc1200_exit(void) |
266 | { | |
267 | pci_unregister_driver(&sc1200_pci_driver); | |
268 | } | |
269 | ||
669a5db4 JG |
270 | MODULE_AUTHOR("Alan Cox, Mark Lord"); |
271 | MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200"); | |
272 | MODULE_LICENSE("GPL"); | |
273 | MODULE_DEVICE_TABLE(pci, sc1200); | |
274 | MODULE_VERSION(DRV_VERSION); | |
275 | ||
276 | module_init(sc1200_init); | |
277 | module_exit(sc1200_exit); |