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Linux/drivers/ata/pata_cs5536.c

  1 /*
  2  * pata_cs5536.c        - CS5536 PATA for new ATA layer
  3  *                        (C) 2007 Martin K. Petersen <mkp@mkp.net>
  4  *                        (C) 2011 Bartlomiej Zolnierkiewicz
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, write to the Free Software
 17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 18  *
 19  * Documentation:
 20  *      Available from AMD web site.
 21  *
 22  * The IDE timing registers for the CS5536 live in the Geode Machine
 23  * Specific Register file and not PCI config space.  Most BIOSes
 24  * virtualize the PCI registers so the chip looks like a standard IDE
 25  * controller.  Unfortunately not all implementations get this right.
 26  * In particular some have problems with unaligned accesses to the
 27  * virtualized PCI registers.  This driver always does full dword
 28  * writes to work around the issue.  Also, in case of a bad BIOS this
 29  * driver can be loaded with the "msr=1" parameter which forces using
 30  * the Machine Specific Registers to configure the device.
 31  */
 32 
 33 #include <linux/kernel.h>
 34 #include <linux/module.h>
 35 #include <linux/pci.h>
 36 #include <linux/init.h>
 37 #include <linux/blkdev.h>
 38 #include <linux/delay.h>
 39 #include <linux/libata.h>
 40 #include <scsi/scsi_host.h>
 41 #include <linux/dmi.h>
 42 
 43 #ifdef CONFIG_X86_32
 44 #include <asm/msr.h>
 45 static int use_msr;
 46 module_param_named(msr, use_msr, int, 0644);
 47 MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");
 48 #else
 49 #undef rdmsr    /* avoid accidental MSR usage on, e.g. x86-64 */
 50 #undef wrmsr
 51 #define rdmsr(x, y, z) do { } while (0)
 52 #define wrmsr(x, y, z) do { } while (0)
 53 #define use_msr 0
 54 #endif
 55 
 56 #define DRV_NAME        "pata_cs5536"
 57 #define DRV_VERSION     "0.0.8"
 58 
 59 enum {
 60         MSR_IDE_CFG             = 0x51300010,
 61         PCI_IDE_CFG             = 0x40,
 62 
 63         CFG                     = 0,
 64         DTC                     = 2,
 65         CAST                    = 3,
 66         ETC                     = 4,
 67 
 68         IDE_CFG_CHANEN          = (1 << 1),
 69         IDE_CFG_CABLE           = (1 << 17) | (1 << 16),
 70 
 71         IDE_D0_SHIFT            = 24,
 72         IDE_D1_SHIFT            = 16,
 73         IDE_DRV_MASK            = 0xff,
 74 
 75         IDE_CAST_D0_SHIFT       = 6,
 76         IDE_CAST_D1_SHIFT       = 4,
 77         IDE_CAST_DRV_MASK       = 0x3,
 78         IDE_CAST_CMD_MASK       = 0xff,
 79         IDE_CAST_CMD_SHIFT      = 24,
 80 
 81         IDE_ETC_UDMA_MASK       = 0xc0,
 82 };
 83 
 84 /* Some Bachmann OT200 devices have a non working UDMA support due a
 85  * missing resistor.
 86  */
 87 static const struct dmi_system_id udma_quirk_dmi_table[] = {
 88         {
 89                 .ident = "Bachmann electronic OT200",
 90                 .matches = {
 91                         DMI_MATCH(DMI_SYS_VENDOR, "Bachmann electronic"),
 92                         DMI_MATCH(DMI_PRODUCT_NAME, "OT200"),
 93                         DMI_MATCH(DMI_PRODUCT_VERSION, "1")
 94                 },
 95         },
 96         { }
 97 };
 98 
 99 static int cs5536_read(struct pci_dev *pdev, int reg, u32 *val)
100 {
101         if (unlikely(use_msr)) {
102                 u32 dummy __maybe_unused;
103 
104                 rdmsr(MSR_IDE_CFG + reg, *val, dummy);
105                 return 0;
106         }
107 
108         return pci_read_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
109 }
110 
111 static int cs5536_write(struct pci_dev *pdev, int reg, int val)
112 {
113         if (unlikely(use_msr)) {
114                 wrmsr(MSR_IDE_CFG + reg, val, 0);
115                 return 0;
116         }
117 
118         return pci_write_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
119 }
120 
121 static void cs5536_program_dtc(struct ata_device *adev, u8 tim)
122 {
123         struct pci_dev *pdev = to_pci_dev(adev->link->ap->host->dev);
124         int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
125         u32 dtc;
126 
127         cs5536_read(pdev, DTC, &dtc);
128         dtc &= ~(IDE_DRV_MASK << dshift);
129         dtc |= tim << dshift;
130         cs5536_write(pdev, DTC, dtc);
131 }
132 
133 /**
134  *      cs5536_cable_detect     -       detect cable type
135  *      @ap: Port to detect on
136  *
137  *      Perform cable detection for ATA66 capable cable.
138  *
139  *      Returns a cable type.
140  */
141 
142 static int cs5536_cable_detect(struct ata_port *ap)
143 {
144         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
145         u32 cfg;
146 
147         cs5536_read(pdev, CFG, &cfg);
148 
149         if (cfg & IDE_CFG_CABLE)
150                 return ATA_CBL_PATA80;
151         else
152                 return ATA_CBL_PATA40;
153 }
154 
155 /**
156  *      cs5536_set_piomode              -       PIO setup
157  *      @ap: ATA interface
158  *      @adev: device on the interface
159  */
160 
161 static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev)
162 {
163         static const u8 drv_timings[5] = {
164                 0x98, 0x55, 0x32, 0x21, 0x20,
165         };
166 
167         static const u8 addr_timings[5] = {
168                 0x2, 0x1, 0x0, 0x0, 0x0,
169         };
170 
171         static const u8 cmd_timings[5] = {
172                 0x99, 0x92, 0x90, 0x22, 0x20,
173         };
174 
175         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
176         struct ata_device *pair = ata_dev_pair(adev);
177         int mode = adev->pio_mode - XFER_PIO_0;
178         int cmdmode = mode;
179         int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
180         u32 cast;
181 
182         if (pair)
183                 cmdmode = min(mode, pair->pio_mode - XFER_PIO_0);
184 
185         cs5536_program_dtc(adev, drv_timings[mode]);
186 
187         cs5536_read(pdev, CAST, &cast);
188 
189         cast &= ~(IDE_CAST_DRV_MASK << cshift);
190         cast |= addr_timings[mode] << cshift;
191 
192         cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT);
193         cast |= cmd_timings[cmdmode] << IDE_CAST_CMD_SHIFT;
194 
195         cs5536_write(pdev, CAST, cast);
196 }
197 
198 /**
199  *      cs5536_set_dmamode              -       DMA timing setup
200  *      @ap: ATA interface
201  *      @adev: Device being configured
202  *
203  */
204 
205 static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev)
206 {
207         static const u8 udma_timings[6] = {
208                 0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6,
209         };
210 
211         static const u8 mwdma_timings[3] = {
212                 0x67, 0x21, 0x20,
213         };
214 
215         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
216         u32 etc;
217         int mode = adev->dma_mode;
218         int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
219 
220         cs5536_read(pdev, ETC, &etc);
221 
222         if (mode >= XFER_UDMA_0) {
223                 etc &= ~(IDE_DRV_MASK << dshift);
224                 etc |= udma_timings[mode - XFER_UDMA_0] << dshift;
225         } else { /* MWDMA */
226                 etc &= ~(IDE_ETC_UDMA_MASK << dshift);
227                 cs5536_program_dtc(adev, mwdma_timings[mode - XFER_MW_DMA_0]);
228         }
229 
230         cs5536_write(pdev, ETC, etc);
231 }
232 
233 static struct scsi_host_template cs5536_sht = {
234         ATA_BMDMA_SHT(DRV_NAME),
235 };
236 
237 static struct ata_port_operations cs5536_port_ops = {
238         .inherits               = &ata_bmdma32_port_ops,
239         .cable_detect           = cs5536_cable_detect,
240         .set_piomode            = cs5536_set_piomode,
241         .set_dmamode            = cs5536_set_dmamode,
242 };
243 
244 /**
245  *      cs5536_init_one
246  *      @dev: PCI device
247  *      @id: Entry in match table
248  *
249  */
250 
251 static int cs5536_init_one(struct pci_dev *dev, const struct pci_device_id *id)
252 {
253         static const struct ata_port_info info = {
254                 .flags = ATA_FLAG_SLAVE_POSS,
255                 .pio_mask = ATA_PIO4,
256                 .mwdma_mask = ATA_MWDMA2,
257                 .udma_mask = ATA_UDMA5,
258                 .port_ops = &cs5536_port_ops,
259         };
260 
261         static const struct ata_port_info no_udma_info = {
262                 .flags = ATA_FLAG_SLAVE_POSS,
263                 .pio_mask = ATA_PIO4,
264                 .port_ops = &cs5536_port_ops,
265         };
266 
267 
268         const struct ata_port_info *ppi[2];
269         u32 cfg;
270 
271         if (dmi_check_system(udma_quirk_dmi_table))
272                 ppi[0] = &no_udma_info;
273         else
274                 ppi[0] = &info;
275 
276         ppi[1] = &ata_dummy_port_info;
277 
278         if (use_msr)
279                 printk(KERN_ERR DRV_NAME ": Using MSR regs instead of PCI\n");
280 
281         cs5536_read(dev, CFG, &cfg);
282 
283         if ((cfg & IDE_CFG_CHANEN) == 0) {
284                 printk(KERN_ERR DRV_NAME ": disabled by BIOS\n");
285                 return -ENODEV;
286         }
287 
288         return ata_pci_bmdma_init_one(dev, ppi, &cs5536_sht, NULL, 0);
289 }
290 
291 static const struct pci_device_id cs5536[] = {
292         { PCI_VDEVICE(AMD,      PCI_DEVICE_ID_AMD_CS5536_IDE), },
293         { },
294 };
295 
296 static struct pci_driver cs5536_pci_driver = {
297         .name           = DRV_NAME,
298         .id_table       = cs5536,
299         .probe          = cs5536_init_one,
300         .remove         = ata_pci_remove_one,
301 #ifdef CONFIG_PM
302         .suspend        = ata_pci_device_suspend,
303         .resume         = ata_pci_device_resume,
304 #endif
305 };
306 
307 module_pci_driver(cs5536_pci_driver);
308 
309 MODULE_AUTHOR("Martin K. Petersen");
310 MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
311 MODULE_LICENSE("GPL");
312 MODULE_DEVICE_TABLE(pci, cs5536);
313 MODULE_VERSION(DRV_VERSION);
314 

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