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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
43static int sc1200_clock(void)
44{
45 /* Magic registers that give us the chipset data */
46 u8 chip_id = inb(0x903C);
47 u8 silicon_rev = inb(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(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
72static 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(pdev, reg + 4, &format);
91 format >>= 31;
92 format += sc1200_clock();
93 pci_write_config_dword(pdev, reg + 8 * adev->devno,
94 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
106static 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(pdev, reg + 4, &timings);
135 timings &= 0x80000000UL;
136 timings |= format;
137 pci_write_config_dword(pdev, reg + 4, timings);
138 } else
139 pci_write_config_dword(pdev, reg + 12, 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
152static 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(prev)) ||
162 (ata_using_udma(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
177static 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
195static struct scsi_host_template sc1200_sht = {
196 ATA_BMDMA_SHT(DRV_NAME),
197 .sg_tablesize = LIBATA_DUMB_MAX_PRD,
198};
199
200static struct ata_port_operations sc1200_port_ops = {
201 .inherits = &ata_bmdma_port_ops,
202 .qc_prep = ata_bmdma_dumb_qc_prep,
203 .qc_issue = sc1200_qc_issue,
204 .qc_defer = sc1200_qc_defer,
205 .cable_detect = ata_cable_40wire,
206 .set_piomode = sc1200_set_piomode,
207 .set_dmamode = sc1200_set_dmamode,
208};
209
210/**
211 * sc1200_init_one - Initialise an SC1200
212 * @dev: PCI device
213 * @id: Entry in match table
214 *
215 * Just throw the needed data at the libata helper and it does all
216 * our work.
217 */
218
219static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
220{
221 static const struct ata_port_info info = {
222 .flags = ATA_FLAG_SLAVE_POSS,
223 .pio_mask = ATA_PIO4,
224 .mwdma_mask = ATA_MWDMA2,
225 .udma_mask = ATA_UDMA2,
226 .port_ops = &sc1200_port_ops
227 };
228 const struct ata_port_info *ppi[] = { &info, NULL };
229
230 return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
231}
232
233static const struct pci_device_id sc1200[] = {
234 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
235
236 { },
237};
238
239static struct pci_driver sc1200_pci_driver = {
240 .name = DRV_NAME,
241 .id_table = sc1200,
242 .probe = sc1200_init_one,
243 .remove = ata_pci_remove_one,
244#ifdef CONFIG_PM_SLEEP
245 .suspend = ata_pci_device_suspend,
246 .resume = ata_pci_device_resume,
247#endif
248};
249
250module_pci_driver(sc1200_pci_driver);
251
252MODULE_AUTHOR("Alan Cox, Mark Lord");
253MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
254MODULE_LICENSE("GPL");
255MODULE_DEVICE_TABLE(pci, sc1200);
256MODULE_VERSION(DRV_VERSION);
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
43static int sc1200_clock(void)
44{
45 /* Magic registers that give us the chipset data */
46 u8 chip_id = inb(0x903C);
47 u8 silicon_rev = inb(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(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
72static 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(pdev, reg + 4, &format);
91 format >>= 31;
92 format += sc1200_clock();
93 pci_write_config_dword(pdev, reg + 8 * adev->devno,
94 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
106static 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(pdev, reg + 4, &timings);
135 timings &= 0x80000000UL;
136 timings |= format;
137 pci_write_config_dword(pdev, reg + 4, timings);
138 } else
139 pci_write_config_dword(pdev, reg + 12, 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
152static 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(prev)) ||
162 (ata_using_udma(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
177static 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
195static 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
201static 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
220static 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(dev, ppi, &sc1200_sht, NULL, 0);
232}
233
234static const struct pci_device_id sc1200[] = {
235 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
236
237 { },
238};
239
240static 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
251module_pci_driver(sc1200_pci_driver);
252
253MODULE_AUTHOR("Alan Cox, Mark Lord");
254MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
255MODULE_LICENSE("GPL");
256MODULE_DEVICE_TABLE(pci, sc1200);
257MODULE_VERSION(DRV_VERSION);