Commit | Line | Data |
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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> | |
669a5db4 JG |
35 | #include <linux/blkdev.h> |
36 | #include <linux/delay.h> | |
37 | #include <scsi/scsi_host.h> | |
38 | #include <linux/libata.h> | |
39 | ||
70f301a6 | 40 | #define DRV_NAME "pata_sc1200" |
2a3103ce | 41 | #define DRV_VERSION "0.2.6" |
669a5db4 JG |
42 | |
43 | #define SC1200_REV_A 0x00 | |
44 | #define SC1200_REV_B1 0x01 | |
45 | #define SC1200_REV_B3 0x02 | |
46 | #define SC1200_REV_C1 0x03 | |
47 | #define SC1200_REV_D1 0x04 | |
48 | ||
49 | /** | |
50 | * sc1200_clock - PCI clock | |
51 | * | |
52 | * Return the PCI bus clocking for the SC1200 chipset configuration | |
53 | * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz | |
54 | */ | |
85cd7251 | 55 | |
669a5db4 JG |
56 | static int sc1200_clock(void) |
57 | { | |
58 | /* Magic registers that give us the chipset data */ | |
59 | u8 chip_id = inb(0x903C); | |
60 | u8 silicon_rev = inb(0x903D); | |
61 | u16 pci_clock; | |
85cd7251 | 62 | |
669a5db4 JG |
63 | if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1) |
64 | return 0; /* 33 MHz mode */ | |
65 | ||
66 | /* Clock generator configuration 0x901E its 8/9 are the PCI clocking | |
67 | 0/3 is 33Mhz 1 is 48 2 is 66 */ | |
68 | ||
69 | pci_clock = inw(0x901E); | |
70 | pci_clock >>= 8; | |
71 | pci_clock &= 0x03; | |
72 | if (pci_clock == 3) | |
73 | pci_clock = 0; | |
74 | return pci_clock; | |
75 | } | |
76 | ||
77 | /** | |
78 | * sc1200_set_piomode - PIO setup | |
79 | * @ap: ATA interface | |
80 | * @adev: device on the interface | |
81 | * | |
82 | * Set our PIO requirements. This is fairly simple on the SC1200 | |
83 | */ | |
85cd7251 | 84 | |
669a5db4 JG |
85 | static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev) |
86 | { | |
87 | static const u32 pio_timings[4][5] = { | |
d0dd4a01 BZ |
88 | /* format0, 33Mhz */ |
89 | { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 }, | |
90 | /* format1, 33Mhz */ | |
91 | { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 }, | |
92 | /* format1, 48Mhz */ | |
93 | { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 }, | |
94 | /* format1, 66Mhz */ | |
95 | { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 } | |
669a5db4 JG |
96 | }; |
97 | ||
98 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
99 | u32 format; | |
100 | unsigned int reg = 0x40 + 0x10 * ap->port_no; | |
101 | int mode = adev->pio_mode - XFER_PIO_0; | |
85cd7251 | 102 | |
669a5db4 JG |
103 | pci_read_config_dword(pdev, reg + 4, &format); |
104 | format >>= 31; | |
105 | format += sc1200_clock(); | |
85cd7251 | 106 | pci_write_config_dword(pdev, reg + 8 * adev->devno, |
669a5db4 JG |
107 | pio_timings[format][mode]); |
108 | } | |
109 | ||
110 | /** | |
111 | * sc1200_set_dmamode - DMA timing setup | |
112 | * @ap: ATA interface | |
113 | * @adev: Device being configured | |
114 | * | |
115 | * We cannot mix MWDMA and UDMA without reloading timings each switch | |
116 | * master to slave. | |
117 | */ | |
85cd7251 | 118 | |
669a5db4 JG |
119 | static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev) |
120 | { | |
121 | static const u32 udma_timing[3][3] = { | |
122 | { 0x00921250, 0x00911140, 0x00911030 }, | |
123 | { 0x00932470, 0x00922260, 0x00922140 }, | |
124 | { 0x009436A1, 0x00933481, 0x00923261 } | |
125 | }; | |
85cd7251 | 126 | |
669a5db4 JG |
127 | static const u32 mwdma_timing[3][3] = { |
128 | { 0x00077771, 0x00012121, 0x00002020 }, | |
129 | { 0x000BBBB2, 0x00024241, 0x00013131 }, | |
130 | { 0x000FFFF3, 0x00035352, 0x00015151 } | |
131 | }; | |
85cd7251 | 132 | |
669a5db4 JG |
133 | int clock = sc1200_clock(); |
134 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
135 | unsigned int reg = 0x40 + 0x10 * ap->port_no; | |
136 | int mode = adev->dma_mode; | |
137 | u32 format; | |
138 | ||
139 | if (mode >= XFER_UDMA_0) | |
140 | format = udma_timing[clock][mode - XFER_UDMA_0]; | |
141 | else | |
142 | format = mwdma_timing[clock][mode - XFER_MW_DMA_0]; | |
85cd7251 | 143 | |
669a5db4 JG |
144 | if (adev->devno == 0) { |
145 | u32 timings; | |
85cd7251 | 146 | |
669a5db4 JG |
147 | pci_read_config_dword(pdev, reg + 4, &timings); |
148 | timings &= 0x80000000UL; | |
149 | timings |= format; | |
150 | pci_write_config_dword(pdev, reg + 4, timings); | |
151 | } else | |
152 | pci_write_config_dword(pdev, reg + 12, format); | |
153 | } | |
154 | ||
155 | /** | |
9363c382 | 156 | * sc1200_qc_issue - command issue |
669a5db4 JG |
157 | * @qc: command pending |
158 | * | |
159 | * Called when the libata layer is about to issue a command. We wrap | |
160 | * this interface so that we can load the correct ATA timings if | |
3a4fa0a2 | 161 | * necessary. Specifically we have a problem that there is only |
669a5db4 JG |
162 | * one MWDMA/UDMA bit. |
163 | */ | |
164 | ||
9363c382 | 165 | static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc) |
669a5db4 JG |
166 | { |
167 | struct ata_port *ap = qc->ap; | |
168 | struct ata_device *adev = qc->dev; | |
169 | struct ata_device *prev = ap->private_data; | |
170 | ||
171 | /* See if the DMA settings could be wrong */ | |
b15b3eba | 172 | if (ata_dma_enabled(adev) && adev != prev && prev != NULL) { |
669a5db4 | 173 | /* Maybe, but do the channels match MWDMA/UDMA ? */ |
b15b3eba AC |
174 | if ((ata_using_udma(adev) && !ata_using_udma(prev)) || |
175 | (ata_using_udma(prev) && !ata_using_udma(adev))) | |
669a5db4 JG |
176 | /* Switch the mode bits */ |
177 | sc1200_set_dmamode(ap, adev); | |
178 | } | |
179 | ||
360ff783 | 180 | return ata_bmdma_qc_issue(qc); |
669a5db4 JG |
181 | } |
182 | ||
c0f2ee34 AC |
183 | /** |
184 | * sc1200_qc_defer - implement serialization | |
185 | * @qc: command | |
186 | * | |
187 | * Serialize command issue on this controller. | |
188 | */ | |
189 | ||
190 | static int sc1200_qc_defer(struct ata_queued_cmd *qc) | |
191 | { | |
192 | struct ata_host *host = qc->ap->host; | |
193 | struct ata_port *alt = host->ports[1 ^ qc->ap->port_no]; | |
194 | int rc; | |
195 | ||
196 | /* First apply the usual rules */ | |
197 | rc = ata_std_qc_defer(qc); | |
198 | if (rc != 0) | |
199 | return rc; | |
200 | ||
201 | /* Now apply serialization rules. Only allow a command if the | |
202 | other channel state machine is idle */ | |
203 | if (alt && alt->qc_active) | |
204 | return ATA_DEFER_PORT; | |
205 | return 0; | |
206 | } | |
207 | ||
669a5db4 | 208 | static struct scsi_host_template sc1200_sht = { |
68d1d07b TH |
209 | ATA_BMDMA_SHT(DRV_NAME), |
210 | .sg_tablesize = LIBATA_DUMB_MAX_PRD, | |
669a5db4 JG |
211 | }; |
212 | ||
213 | static struct ata_port_operations sc1200_port_ops = { | |
029cfd6b | 214 | .inherits = &ata_bmdma_port_ops, |
f47451c4 | 215 | .qc_prep = ata_bmdma_dumb_qc_prep, |
9363c382 | 216 | .qc_issue = sc1200_qc_issue, |
c0f2ee34 | 217 | .qc_defer = sc1200_qc_defer, |
029cfd6b TH |
218 | .cable_detect = ata_cable_40wire, |
219 | .set_piomode = sc1200_set_piomode, | |
220 | .set_dmamode = sc1200_set_dmamode, | |
85cd7251 | 221 | }; |
669a5db4 JG |
222 | |
223 | /** | |
224 | * sc1200_init_one - Initialise an SC1200 | |
225 | * @dev: PCI device | |
226 | * @id: Entry in match table | |
227 | * | |
228 | * Just throw the needed data at the libata helper and it does all | |
229 | * our work. | |
230 | */ | |
85cd7251 | 231 | |
669a5db4 JG |
232 | static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
233 | { | |
1626aeb8 | 234 | static const struct ata_port_info info = { |
1d2808fd | 235 | .flags = ATA_FLAG_SLAVE_POSS, |
14bdef98 EIB |
236 | .pio_mask = ATA_PIO4, |
237 | .mwdma_mask = ATA_MWDMA2, | |
238 | .udma_mask = ATA_UDMA2, | |
669a5db4 JG |
239 | .port_ops = &sc1200_port_ops |
240 | }; | |
6d4f950e | 241 | const struct ata_port_info *ppi[] = { &info, NULL }; |
1626aeb8 | 242 | |
1c5afdf7 | 243 | return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0); |
669a5db4 JG |
244 | } |
245 | ||
2d2744fc JG |
246 | static const struct pci_device_id sc1200[] = { |
247 | { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), }, | |
248 | ||
249 | { }, | |
669a5db4 JG |
250 | }; |
251 | ||
252 | static struct pci_driver sc1200_pci_driver = { | |
2d2744fc | 253 | .name = DRV_NAME, |
669a5db4 JG |
254 | .id_table = sc1200, |
255 | .probe = sc1200_init_one, | |
30ced0f0 | 256 | .remove = ata_pci_remove_one, |
58eb8cd5 | 257 | #ifdef CONFIG_PM_SLEEP |
30ced0f0 A |
258 | .suspend = ata_pci_device_suspend, |
259 | .resume = ata_pci_device_resume, | |
438ac6d5 | 260 | #endif |
669a5db4 JG |
261 | }; |
262 | ||
2fc75da0 | 263 | module_pci_driver(sc1200_pci_driver); |
669a5db4 | 264 | |
669a5db4 JG |
265 | MODULE_AUTHOR("Alan Cox, Mark Lord"); |
266 | MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200"); | |
267 | MODULE_LICENSE("GPL"); | |
268 | MODULE_DEVICE_TABLE(pci, sc1200); | |
269 | MODULE_VERSION(DRV_VERSION); |