1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * New ATA layer SC1200 driver Alan Cox <alan@lxorguk.ukuu.org.uk> |
4 | * |
5 | * TODO: Mode selection filtering |
6 | * TODO: Needs custom DMA cleanup code |
7 | * |
8 | * Based very heavily on |
9 | * |
10 | * linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003 |
11 | * |
12 | * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com> |
13 | * May be copied or modified under the terms of the GNU General Public License |
14 | * |
15 | * Development of this chipset driver was funded |
16 | * by the nice folks at National Semiconductor. |
17 | */ |
18 | |
19 | #include <linux/kernel.h> |
20 | #include <linux/module.h> |
21 | #include <linux/pci.h> |
22 | #include <linux/blkdev.h> |
23 | #include <linux/delay.h> |
24 | #include <scsi/scsi_host.h> |
25 | #include <linux/libata.h> |
26 | |
27 | #define DRV_NAME "pata_sc1200" |
28 | #define DRV_VERSION "0.2.6" |
29 | |
30 | #define SC1200_REV_A 0x00 |
31 | #define SC1200_REV_B1 0x01 |
32 | #define SC1200_REV_B3 0x02 |
33 | #define SC1200_REV_C1 0x03 |
34 | #define SC1200_REV_D1 0x04 |
35 | |
36 | /** |
37 | * sc1200_clock - PCI clock |
38 | * |
39 | * Return the PCI bus clocking for the SC1200 chipset configuration |
40 | * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz |
41 | */ |
42 | |
43 | static int sc1200_clock(void) |
44 | { |
45 | /* Magic registers that give us the chipset data */ |
46 | u8 chip_id = inb(port: 0x903C); |
47 | u8 silicon_rev = inb(port: 0x903D); |
48 | u16 pci_clock; |
49 | |
50 | if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1) |
51 | return 0; /* 33 MHz mode */ |
52 | |
53 | /* Clock generator configuration 0x901E its 8/9 are the PCI clocking |
54 | 0/3 is 33Mhz 1 is 48 2 is 66 */ |
55 | |
56 | pci_clock = inw(port: 0x901E); |
57 | pci_clock >>= 8; |
58 | pci_clock &= 0x03; |
59 | if (pci_clock == 3) |
60 | pci_clock = 0; |
61 | return pci_clock; |
62 | } |
63 | |
64 | /** |
65 | * sc1200_set_piomode - PIO setup |
66 | * @ap: ATA interface |
67 | * @adev: device on the interface |
68 | * |
69 | * Set our PIO requirements. This is fairly simple on the SC1200 |
70 | */ |
71 | |
72 | static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev) |
73 | { |
74 | static const u32 pio_timings[4][5] = { |
75 | /* format0, 33Mhz */ |
76 | { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 }, |
77 | /* format1, 33Mhz */ |
78 | { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 }, |
79 | /* format1, 48Mhz */ |
80 | { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 }, |
81 | /* format1, 66Mhz */ |
82 | { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 } |
83 | }; |
84 | |
85 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
86 | u32 format; |
87 | unsigned int reg = 0x40 + 0x10 * ap->port_no; |
88 | int mode = adev->pio_mode - XFER_PIO_0; |
89 | |
90 | pci_read_config_dword(dev: pdev, where: reg + 4, val: &format); |
91 | format >>= 31; |
92 | format += sc1200_clock(); |
93 | pci_write_config_dword(dev: pdev, where: reg + 8 * adev->devno, |
94 | val: pio_timings[format][mode]); |
95 | } |
96 | |
97 | /** |
98 | * sc1200_set_dmamode - DMA timing setup |
99 | * @ap: ATA interface |
100 | * @adev: Device being configured |
101 | * |
102 | * We cannot mix MWDMA and UDMA without reloading timings each switch |
103 | * master to slave. |
104 | */ |
105 | |
106 | static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev) |
107 | { |
108 | static const u32 udma_timing[3][3] = { |
109 | { 0x00921250, 0x00911140, 0x00911030 }, |
110 | { 0x00932470, 0x00922260, 0x00922140 }, |
111 | { 0x009436A1, 0x00933481, 0x00923261 } |
112 | }; |
113 | |
114 | static const u32 mwdma_timing[3][3] = { |
115 | { 0x00077771, 0x00012121, 0x00002020 }, |
116 | { 0x000BBBB2, 0x00024241, 0x00013131 }, |
117 | { 0x000FFFF3, 0x00035352, 0x00015151 } |
118 | }; |
119 | |
120 | int clock = sc1200_clock(); |
121 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
122 | unsigned int reg = 0x40 + 0x10 * ap->port_no; |
123 | int mode = adev->dma_mode; |
124 | u32 format; |
125 | |
126 | if (mode >= XFER_UDMA_0) |
127 | format = udma_timing[clock][mode - XFER_UDMA_0]; |
128 | else |
129 | format = mwdma_timing[clock][mode - XFER_MW_DMA_0]; |
130 | |
131 | if (adev->devno == 0) { |
132 | u32 timings; |
133 | |
134 | pci_read_config_dword(dev: pdev, where: reg + 4, val: &timings); |
135 | timings &= 0x80000000UL; |
136 | timings |= format; |
137 | pci_write_config_dword(dev: pdev, where: reg + 4, val: timings); |
138 | } else |
139 | pci_write_config_dword(dev: pdev, where: reg + 12, val: format); |
140 | } |
141 | |
142 | /** |
143 | * sc1200_qc_issue - command issue |
144 | * @qc: command pending |
145 | * |
146 | * Called when the libata layer is about to issue a command. We wrap |
147 | * this interface so that we can load the correct ATA timings if |
148 | * necessary. Specifically we have a problem that there is only |
149 | * one MWDMA/UDMA bit. |
150 | */ |
151 | |
152 | static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc) |
153 | { |
154 | struct ata_port *ap = qc->ap; |
155 | struct ata_device *adev = qc->dev; |
156 | struct ata_device *prev = ap->private_data; |
157 | |
158 | /* See if the DMA settings could be wrong */ |
159 | if (ata_dma_enabled(adev) && adev != prev && prev != NULL) { |
160 | /* Maybe, but do the channels match MWDMA/UDMA ? */ |
161 | if ((ata_using_udma(adev) && !ata_using_udma(adev: prev)) || |
162 | (ata_using_udma(adev: prev) && !ata_using_udma(adev))) |
163 | /* Switch the mode bits */ |
164 | sc1200_set_dmamode(ap, adev); |
165 | } |
166 | |
167 | return ata_bmdma_qc_issue(qc); |
168 | } |
169 | |
170 | /** |
171 | * sc1200_qc_defer - implement serialization |
172 | * @qc: command |
173 | * |
174 | * Serialize command issue on this controller. |
175 | */ |
176 | |
177 | static int sc1200_qc_defer(struct ata_queued_cmd *qc) |
178 | { |
179 | struct ata_host *host = qc->ap->host; |
180 | struct ata_port *alt = host->ports[1 ^ qc->ap->port_no]; |
181 | int rc; |
182 | |
183 | /* First apply the usual rules */ |
184 | rc = ata_std_qc_defer(qc); |
185 | if (rc != 0) |
186 | return rc; |
187 | |
188 | /* Now apply serialization rules. Only allow a command if the |
189 | other channel state machine is idle */ |
190 | if (alt && alt->qc_active) |
191 | return ATA_DEFER_PORT; |
192 | return 0; |
193 | } |
194 | |
195 | static const struct scsi_host_template sc1200_sht = { |
196 | ATA_BASE_SHT(DRV_NAME), |
197 | .sg_tablesize = LIBATA_DUMB_MAX_PRD, |
198 | .dma_boundary = ATA_DMA_BOUNDARY, |
199 | }; |
200 | |
201 | static struct ata_port_operations sc1200_port_ops = { |
202 | .inherits = &ata_bmdma_port_ops, |
203 | .qc_prep = ata_bmdma_dumb_qc_prep, |
204 | .qc_issue = sc1200_qc_issue, |
205 | .qc_defer = sc1200_qc_defer, |
206 | .cable_detect = ata_cable_40wire, |
207 | .set_piomode = sc1200_set_piomode, |
208 | .set_dmamode = sc1200_set_dmamode, |
209 | }; |
210 | |
211 | /** |
212 | * sc1200_init_one - Initialise an SC1200 |
213 | * @dev: PCI device |
214 | * @id: Entry in match table |
215 | * |
216 | * Just throw the needed data at the libata helper and it does all |
217 | * our work. |
218 | */ |
219 | |
220 | static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
221 | { |
222 | static const struct ata_port_info info = { |
223 | .flags = ATA_FLAG_SLAVE_POSS, |
224 | .pio_mask = ATA_PIO4, |
225 | .mwdma_mask = ATA_MWDMA2, |
226 | .udma_mask = ATA_UDMA2, |
227 | .port_ops = &sc1200_port_ops |
228 | }; |
229 | const struct ata_port_info *ppi[] = { &info, NULL }; |
230 | |
231 | return ata_pci_bmdma_init_one(pdev: dev, ppi, sht: &sc1200_sht, NULL, hflags: 0); |
232 | } |
233 | |
234 | static const struct pci_device_id sc1200[] = { |
235 | { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), }, |
236 | |
237 | { }, |
238 | }; |
239 | |
240 | static struct pci_driver sc1200_pci_driver = { |
241 | .name = DRV_NAME, |
242 | .id_table = sc1200, |
243 | .probe = sc1200_init_one, |
244 | .remove = ata_pci_remove_one, |
245 | #ifdef CONFIG_PM_SLEEP |
246 | .suspend = ata_pci_device_suspend, |
247 | .resume = ata_pci_device_resume, |
248 | #endif |
249 | }; |
250 | |
251 | module_pci_driver(sc1200_pci_driver); |
252 | |
253 | MODULE_AUTHOR("Alan Cox, Mark Lord" ); |
254 | MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200" ); |
255 | MODULE_LICENSE("GPL" ); |
256 | MODULE_DEVICE_TABLE(pci, sc1200); |
257 | MODULE_VERSION(DRV_VERSION); |
258 | |