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1 /*
2 * pata_cs5536.c - CS5536 PATA for new ATA layer
3 * (C) 2007 Martin K. Petersen <mkp@mkp.net>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * Documentation:
19 * Available from AMD web site.
20 *
21 * The IDE timing registers for the CS5536 live in the Geode Machine
22 * Specific Register file and not PCI config space. Most BIOSes
23 * virtualize the PCI registers so the chip looks like a standard IDE
24 * controller. Unfortunately not all implementations get this right.
25 * In particular some have problems with unaligned accesses to the
26 * virtualized PCI registers. This driver always does full dword
27 * writes to work around the issue. Also, in case of a bad BIOS this
28 * driver can be loaded with the "msr=1" parameter which forces using
29 * the Machine Specific Registers to configure the device.
30 */
31
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/pci.h>
35 #include <linux/init.h>
36 #include <linux/blkdev.h>
37 #include <linux/delay.h>
38 #include <linux/libata.h>
39 #include <scsi/scsi_host.h>
40
41 #ifdef CONFIG_X86_32
42 #include <asm/msr.h>
43 static int use_msr;
44 module_param_named(msr, use_msr, int, 0644);
45 MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");
46 #else
47 #undef rdmsr /* avoid accidental MSR usage on, e.g. x86-64 */
48 #undef wrmsr
49 #define rdmsr(x, y, z) do { } while (0)
50 #define wrmsr(x, y, z) do { } while (0)
51 #define use_msr 0
52 #endif
53
54 #define DRV_NAME "pata_cs5536"
55 #define DRV_VERSION "0.0.8"
56
57 enum {
58 CFG = 0,
59 DTC = 1,
60 CAST = 2,
61 ETC = 3,
62
63 MSR_IDE_BASE = 0x51300000,
64 MSR_IDE_CFG = (MSR_IDE_BASE + 0x10),
65 MSR_IDE_DTC = (MSR_IDE_BASE + 0x12),
66 MSR_IDE_CAST = (MSR_IDE_BASE + 0x13),
67 MSR_IDE_ETC = (MSR_IDE_BASE + 0x14),
68
69 PCI_IDE_CFG = 0x40,
70 PCI_IDE_DTC = 0x48,
71 PCI_IDE_CAST = 0x4c,
72 PCI_IDE_ETC = 0x50,
73
74 IDE_CFG_CHANEN = 0x2,
75 IDE_CFG_CABLE = 0x10000,
76
77 IDE_D0_SHIFT = 24,
78 IDE_D1_SHIFT = 16,
79 IDE_DRV_MASK = 0xff,
80
81 IDE_CAST_D0_SHIFT = 6,
82 IDE_CAST_D1_SHIFT = 4,
83 IDE_CAST_DRV_MASK = 0x3,
84 IDE_CAST_CMD_MASK = 0xff,
85 IDE_CAST_CMD_SHIFT = 24,
86
87 IDE_ETC_NODMA = 0x03,
88 };
89
90 static const u32 msr_reg[4] = {
91 MSR_IDE_CFG, MSR_IDE_DTC, MSR_IDE_CAST, MSR_IDE_ETC,
92 };
93
94 static const u8 pci_reg[4] = {
95 PCI_IDE_CFG, PCI_IDE_DTC, PCI_IDE_CAST, PCI_IDE_ETC,
96 };
97
98 static inline int cs5536_read(struct pci_dev *pdev, int reg, u32 *val)
99 {
100 if (unlikely(use_msr)) {
101 u32 dummy __maybe_unused;
102
103 rdmsr(msr_reg[reg], *val, dummy);
104 return 0;
105 }
106
107 return pci_read_config_dword(pdev, pci_reg[reg], val);
108 }
109
110 static inline int cs5536_write(struct pci_dev *pdev, int reg, int val)
111 {
112 if (unlikely(use_msr)) {
113 wrmsr(msr_reg[reg], val, 0);
114 return 0;
115 }
116
117 return pci_write_config_dword(pdev, pci_reg[reg], val);
118 }
119
120 /**
121 * cs5536_cable_detect - detect cable type
122 * @ap: Port to detect on
123 *
124 * Perform cable detection for ATA66 capable cable. Return a libata
125 * cable type.
126 */
127
128 static int cs5536_cable_detect(struct ata_port *ap)
129 {
130 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
131 u32 cfg;
132
133 cs5536_read(pdev, CFG, &cfg);
134
135 if (cfg & (IDE_CFG_CABLE << ap->port_no))
136 return ATA_CBL_PATA80;
137 else
138 return ATA_CBL_PATA40;
139 }
140
141 /**
142 * cs5536_set_piomode - PIO setup
143 * @ap: ATA interface
144 * @adev: device on the interface
145 */
146
147 static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev)
148 {
149 static const u8 drv_timings[5] = {
150 0x98, 0x55, 0x32, 0x21, 0x20,
151 };
152
153 static const u8 addr_timings[5] = {
154 0x2, 0x1, 0x0, 0x0, 0x0,
155 };
156
157 static const u8 cmd_timings[5] = {
158 0x99, 0x92, 0x90, 0x22, 0x20,
159 };
160
161 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
162 struct ata_device *pair = ata_dev_pair(adev);
163 int mode = adev->pio_mode - XFER_PIO_0;
164 int cmdmode = mode;
165 int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
166 int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
167 u32 dtc, cast, etc;
168
169 if (pair)
170 cmdmode = min(mode, pair->pio_mode - XFER_PIO_0);
171
172 cs5536_read(pdev, DTC, &dtc);
173 cs5536_read(pdev, CAST, &cast);
174 cs5536_read(pdev, ETC, &etc);
175
176 dtc &= ~(IDE_DRV_MASK << dshift);
177 dtc |= drv_timings[mode] << dshift;
178
179 cast &= ~(IDE_CAST_DRV_MASK << cshift);
180 cast |= addr_timings[mode] << cshift;
181
182 cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT);
183 cast |= cmd_timings[cmdmode] << IDE_CAST_CMD_SHIFT;
184
185 etc &= ~(IDE_DRV_MASK << dshift);
186 etc |= IDE_ETC_NODMA << dshift;
187
188 cs5536_write(pdev, DTC, dtc);
189 cs5536_write(pdev, CAST, cast);
190 cs5536_write(pdev, ETC, etc);
191 }
192
193 /**
194 * cs5536_set_dmamode - DMA timing setup
195 * @ap: ATA interface
196 * @adev: Device being configured
197 *
198 */
199
200 static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev)
201 {
202 static const u8 udma_timings[6] = {
203 0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6,
204 };
205
206 static const u8 mwdma_timings[3] = {
207 0x67, 0x21, 0x20,
208 };
209
210 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
211 u32 dtc, etc;
212 int mode = adev->dma_mode;
213 int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
214
215 if (mode >= XFER_UDMA_0) {
216 cs5536_read(pdev, ETC, &etc);
217
218 etc &= ~(IDE_DRV_MASK << dshift);
219 etc |= udma_timings[mode - XFER_UDMA_0] << dshift;
220
221 cs5536_write(pdev, ETC, etc);
222 } else { /* MWDMA */
223 cs5536_read(pdev, DTC, &dtc);
224
225 dtc &= ~(IDE_DRV_MASK << dshift);
226 dtc |= mwdma_timings[mode - XFER_MW_DMA_0] << dshift;
227
228 cs5536_write(pdev, DTC, dtc);
229 }
230 }
231
232 static struct scsi_host_template cs5536_sht = {
233 ATA_BMDMA_SHT(DRV_NAME),
234 };
235
236 static struct ata_port_operations cs5536_port_ops = {
237 .inherits = &ata_bmdma32_port_ops,
238 .cable_detect = cs5536_cable_detect,
239 .set_piomode = cs5536_set_piomode,
240 .set_dmamode = cs5536_set_dmamode,
241 };
242
243 /**
244 * cs5536_init_one
245 * @dev: PCI device
246 * @id: Entry in match table
247 *
248 */
249
250 static int cs5536_init_one(struct pci_dev *dev, const struct pci_device_id *id)
251 {
252 static const struct ata_port_info info = {
253 .flags = ATA_FLAG_SLAVE_POSS,
254 .pio_mask = ATA_PIO4,
255 .mwdma_mask = ATA_MWDMA2,
256 .udma_mask = ATA_UDMA5,
257 .port_ops = &cs5536_port_ops,
258 };
259
260 const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
261 u32 cfg;
262
263 if (use_msr)
264 printk(KERN_ERR DRV_NAME ": Using MSR regs instead of PCI\n");
265
266 cs5536_read(dev, CFG, &cfg);
267
268 if ((cfg & IDE_CFG_CHANEN) == 0) {
269 printk(KERN_ERR DRV_NAME ": disabled by BIOS\n");
270 return -ENODEV;
271 }
272
273 return ata_pci_bmdma_init_one(dev, ppi, &cs5536_sht, NULL, 0);
274 }
275
276 static const struct pci_device_id cs5536[] = {
277 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), },
278 { },
279 };
280
281 static struct pci_driver cs5536_pci_driver = {
282 .name = DRV_NAME,
283 .id_table = cs5536,
284 .probe = cs5536_init_one,
285 .remove = ata_pci_remove_one,
286 #ifdef CONFIG_PM
287 .suspend = ata_pci_device_suspend,
288 .resume = ata_pci_device_resume,
289 #endif
290 };
291
292 static int __init cs5536_init(void)
293 {
294 return pci_register_driver(&cs5536_pci_driver);
295 }
296
297 static void __exit cs5536_exit(void)
298 {
299 pci_unregister_driver(&cs5536_pci_driver);
300 }
301
302 MODULE_AUTHOR("Martin K. Petersen");
303 MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
304 MODULE_LICENSE("GPL");
305 MODULE_DEVICE_TABLE(pci, cs5536);
306 MODULE_VERSION(DRV_VERSION);
307
308 module_init(cs5536_init);
309 module_exit(cs5536_exit);