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32#include <linux/kernel.h>
33#include <linux/module.h>
34#include <linux/pci.h>
35#include <linux/blkdev.h>
36#include <linux/delay.h>
37#include <scsi/scsi_host.h>
38#include <linux/libata.h>
39
40#define DRV_NAME "pata_sc1200"
41#define DRV_VERSION "0.2.6"
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
51
52
53
54
55
56static int sc1200_clock(void)
57{
58
59 u8 chip_id = inb(0x903C);
60 u8 silicon_rev = inb(0x903D);
61 u16 pci_clock;
62
63 if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
64 return 0;
65
66
67
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
79
80
81
82
83
84
85static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
86{
87 static const u32 pio_timings[4][5] = {
88
89 { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 },
90
91 { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 },
92
93 { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 },
94
95 { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 }
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;
102
103 pci_read_config_dword(pdev, reg + 4, &format);
104 format >>= 31;
105 format += sc1200_clock();
106 pci_write_config_dword(pdev, reg + 8 * adev->devno,
107 pio_timings[format][mode]);
108}
109
110
111
112
113
114
115
116
117
118
119static 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 };
126
127 static const u32 mwdma_timing[3][3] = {
128 { 0x00077771, 0x00012121, 0x00002020 },
129 { 0x000BBBB2, 0x00024241, 0x00013131 },
130 { 0x000FFFF3, 0x00035352, 0x00015151 }
131 };
132
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];
143
144 if (adev->devno == 0) {
145 u32 timings;
146
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
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162
163
164
165static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
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
172 if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
173
174 if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
175 (ata_using_udma(prev) && !ata_using_udma(adev)))
176
177 sc1200_set_dmamode(ap, adev);
178 }
179
180 return ata_bmdma_qc_issue(qc);
181}
182
183
184
185
186
187
188
189
190static 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
197 rc = ata_std_qc_defer(qc);
198 if (rc != 0)
199 return rc;
200
201
202
203 if (alt && alt->qc_active)
204 return ATA_DEFER_PORT;
205 return 0;
206}
207
208static struct scsi_host_template sc1200_sht = {
209 ATA_BMDMA_SHT(DRV_NAME),
210 .sg_tablesize = LIBATA_DUMB_MAX_PRD,
211};
212
213static struct ata_port_operations sc1200_port_ops = {
214 .inherits = &ata_bmdma_port_ops,
215 .qc_prep = ata_bmdma_dumb_qc_prep,
216 .qc_issue = sc1200_qc_issue,
217 .qc_defer = sc1200_qc_defer,
218 .cable_detect = ata_cable_40wire,
219 .set_piomode = sc1200_set_piomode,
220 .set_dmamode = sc1200_set_dmamode,
221};
222
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229
230
231
232static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
233{
234 static const struct ata_port_info info = {
235 .flags = ATA_FLAG_SLAVE_POSS,
236 .pio_mask = ATA_PIO4,
237 .mwdma_mask = ATA_MWDMA2,
238 .udma_mask = ATA_UDMA2,
239 .port_ops = &sc1200_port_ops
240 };
241 const struct ata_port_info *ppi[] = { &info, NULL };
242
243 return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
244}
245
246static const struct pci_device_id sc1200[] = {
247 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
248
249 { },
250};
251
252static struct pci_driver sc1200_pci_driver = {
253 .name = DRV_NAME,
254 .id_table = sc1200,
255 .probe = sc1200_init_one,
256 .remove = ata_pci_remove_one,
257#ifdef CONFIG_PM_SLEEP
258 .suspend = ata_pci_device_suspend,
259 .resume = ata_pci_device_resume,
260#endif
261};
262
263module_pci_driver(sc1200_pci_driver);
264
265MODULE_AUTHOR("Alan Cox, Mark Lord");
266MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
267MODULE_LICENSE("GPL");
268MODULE_DEVICE_TABLE(pci, sc1200);
269MODULE_VERSION(DRV_VERSION);
270