1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * pata_triflex.c - Compaq PATA for new ATA layer |
4 | * (C) 2005 Red Hat Inc |
5 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
6 | * |
7 | * based upon |
8 | * |
9 | * triflex.c |
10 | * |
11 | * IDE Chipset driver for the Compaq TriFlex IDE controller. |
12 | * |
13 | * Known to work with the Compaq Workstation 5x00 series. |
14 | * |
15 | * Copyright (C) 2002 Hewlett-Packard Development Group, L.P. |
16 | * Author: Torben Mathiasen <torben.mathiasen@hp.com> |
17 | * |
18 | * Loosely based on the piix & svwks drivers. |
19 | * |
20 | * Documentation: |
21 | * Not publicly available. |
22 | */ |
23 | |
24 | #include <linux/kernel.h> |
25 | #include <linux/module.h> |
26 | #include <linux/pci.h> |
27 | #include <linux/blkdev.h> |
28 | #include <linux/delay.h> |
29 | #include <scsi/scsi_host.h> |
30 | #include <linux/libata.h> |
31 | |
32 | #define DRV_NAME "pata_triflex" |
33 | #define DRV_VERSION "0.2.8" |
34 | |
35 | /** |
36 | * triflex_prereset - probe begin |
37 | * @link: ATA link |
38 | * @deadline: deadline jiffies for the operation |
39 | * |
40 | * Set up cable type and use generic probe init |
41 | */ |
42 | |
43 | static int triflex_prereset(struct ata_link *link, unsigned long deadline) |
44 | { |
45 | static const struct pci_bits triflex_enable_bits[] = { |
46 | { 0x80, 1, 0x01, 0x01 }, |
47 | { 0x80, 1, 0x02, 0x02 } |
48 | }; |
49 | |
50 | struct ata_port *ap = link->ap; |
51 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
52 | |
53 | if (!pci_test_config_bits(pdev, bits: &triflex_enable_bits[ap->port_no])) |
54 | return -ENOENT; |
55 | |
56 | return ata_sff_prereset(link, deadline); |
57 | } |
58 | |
59 | |
60 | |
61 | /** |
62 | * triflex_load_timing - timing configuration |
63 | * @ap: ATA interface |
64 | * @adev: Device on the bus |
65 | * @speed: speed to configure |
66 | * |
67 | * The Triflex has one set of timings per device per channel. This |
68 | * means we must do some switching. As the PIO and DMA timings don't |
69 | * match we have to do some reloading unlike PIIX devices where tuning |
70 | * tricks can avoid it. |
71 | */ |
72 | |
73 | static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed) |
74 | { |
75 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
76 | u32 timing = 0; |
77 | u32 triflex_timing, old_triflex_timing; |
78 | int channel_offset = ap->port_no ? 0x74: 0x70; |
79 | unsigned int is_slave = (adev->devno != 0); |
80 | |
81 | |
82 | pci_read_config_dword(dev: pdev, where: channel_offset, val: &old_triflex_timing); |
83 | triflex_timing = old_triflex_timing; |
84 | |
85 | switch(speed) |
86 | { |
87 | case XFER_MW_DMA_2: |
88 | timing = 0x0103;break; |
89 | case XFER_MW_DMA_1: |
90 | timing = 0x0203;break; |
91 | case XFER_MW_DMA_0: |
92 | timing = 0x0808;break; |
93 | case XFER_SW_DMA_2: |
94 | case XFER_SW_DMA_1: |
95 | case XFER_SW_DMA_0: |
96 | timing = 0x0F0F;break; |
97 | case XFER_PIO_4: |
98 | timing = 0x0202;break; |
99 | case XFER_PIO_3: |
100 | timing = 0x0204;break; |
101 | case XFER_PIO_2: |
102 | timing = 0x0404;break; |
103 | case XFER_PIO_1: |
104 | timing = 0x0508;break; |
105 | case XFER_PIO_0: |
106 | timing = 0x0808;break; |
107 | default: |
108 | BUG(); |
109 | } |
110 | triflex_timing &= ~ (0xFFFF << (16 * is_slave)); |
111 | triflex_timing |= (timing << (16 * is_slave)); |
112 | |
113 | if (triflex_timing != old_triflex_timing) |
114 | pci_write_config_dword(dev: pdev, where: channel_offset, val: triflex_timing); |
115 | } |
116 | |
117 | /** |
118 | * triflex_set_piomode - set initial PIO mode data |
119 | * @ap: ATA interface |
120 | * @adev: ATA device |
121 | * |
122 | * Use the timing loader to set up the PIO mode. We have to do this |
123 | * because DMA start/stop will only be called once DMA occurs. If there |
124 | * has been no DMA then the PIO timings are still needed. |
125 | */ |
126 | static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev) |
127 | { |
128 | triflex_load_timing(ap, adev, speed: adev->pio_mode); |
129 | } |
130 | |
131 | /** |
132 | * triflex_bmdma_start - DMA start callback |
133 | * @qc: Command in progress |
134 | * |
135 | * Usually drivers set the DMA timing at the point the set_dmamode call |
136 | * is made. Triflex however requires we load new timings on the |
137 | * transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc). |
138 | * We load the DMA timings just before starting DMA and then restore |
139 | * the PIO timing when the DMA is finished. |
140 | */ |
141 | |
142 | static void triflex_bmdma_start(struct ata_queued_cmd *qc) |
143 | { |
144 | triflex_load_timing(ap: qc->ap, adev: qc->dev, speed: qc->dev->dma_mode); |
145 | ata_bmdma_start(qc); |
146 | } |
147 | |
148 | /** |
149 | * triflex_bmdma_stop - DMA stop callback |
150 | * @qc: ATA command |
151 | * |
152 | * We loaded new timings in dma_start, as a result we need to restore |
153 | * the PIO timings in dma_stop so that the next command issue gets the |
154 | * right clock values. |
155 | */ |
156 | |
157 | static void triflex_bmdma_stop(struct ata_queued_cmd *qc) |
158 | { |
159 | ata_bmdma_stop(qc); |
160 | triflex_load_timing(ap: qc->ap, adev: qc->dev, speed: qc->dev->pio_mode); |
161 | } |
162 | |
163 | static const struct scsi_host_template triflex_sht = { |
164 | ATA_BMDMA_SHT(DRV_NAME), |
165 | }; |
166 | |
167 | static struct ata_port_operations triflex_port_ops = { |
168 | .inherits = &ata_bmdma_port_ops, |
169 | .bmdma_start = triflex_bmdma_start, |
170 | .bmdma_stop = triflex_bmdma_stop, |
171 | .cable_detect = ata_cable_40wire, |
172 | .set_piomode = triflex_set_piomode, |
173 | .prereset = triflex_prereset, |
174 | }; |
175 | |
176 | static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
177 | { |
178 | static const struct ata_port_info info = { |
179 | .flags = ATA_FLAG_SLAVE_POSS, |
180 | .pio_mask = ATA_PIO4, |
181 | .mwdma_mask = ATA_MWDMA2, |
182 | .port_ops = &triflex_port_ops |
183 | }; |
184 | const struct ata_port_info *ppi[] = { &info, NULL }; |
185 | |
186 | ata_print_version_once(&dev->dev, DRV_VERSION); |
187 | |
188 | return ata_pci_bmdma_init_one(pdev: dev, ppi, sht: &triflex_sht, NULL, hflags: 0); |
189 | } |
190 | |
191 | static const struct pci_device_id triflex[] = { |
192 | { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), }, |
193 | |
194 | { }, |
195 | }; |
196 | |
197 | #ifdef CONFIG_PM_SLEEP |
198 | static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg) |
199 | { |
200 | struct ata_host *host = pci_get_drvdata(pdev); |
201 | |
202 | ata_host_suspend(host, mesg); |
203 | |
204 | /* |
205 | * We must not disable or powerdown the device. |
206 | * APM bios refuses to suspend if IDE is not accessible. |
207 | */ |
208 | pci_save_state(dev: pdev); |
209 | |
210 | return 0; |
211 | } |
212 | |
213 | #endif |
214 | |
215 | static struct pci_driver triflex_pci_driver = { |
216 | .name = DRV_NAME, |
217 | .id_table = triflex, |
218 | .probe = triflex_init_one, |
219 | .remove = ata_pci_remove_one, |
220 | #ifdef CONFIG_PM_SLEEP |
221 | .suspend = triflex_ata_pci_device_suspend, |
222 | .resume = ata_pci_device_resume, |
223 | #endif |
224 | }; |
225 | |
226 | module_pci_driver(triflex_pci_driver); |
227 | |
228 | MODULE_AUTHOR("Alan Cox" ); |
229 | MODULE_DESCRIPTION("low-level driver for Compaq Triflex" ); |
230 | MODULE_LICENSE("GPL" ); |
231 | MODULE_DEVICE_TABLE(pci, triflex); |
232 | MODULE_VERSION(DRV_VERSION); |
233 | |