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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/blkdev.h>
 37 #include <linux/delay.h>
 38 #include <linux/libata.h>
 39 #include <scsi/scsi_host.h>
 40 #include <linux/dmi.h>
 41 
 42 #ifdef CONFIG_X86_32
 43 #include <asm/msr.h>
 44 static int use_msr;
 45 module_param_named(msr, use_msr, int, 0644);
 46 MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");
 47 #else
 48 #undef rdmsr    /* avoid accidental MSR usage on, e.g. x86-64 */
 49 #undef wrmsr
 50 #define rdmsr(x, y, z) do { } while (0)
 51 #define wrmsr(x, y, z) do { } while (0)
 52 #define use_msr 0
 53 #endif
 54 
 55 #define DRV_NAME        "pata_cs5536"
 56 #define DRV_VERSION     "0.0.8"
 57 
 58 enum {
 59         MSR_IDE_CFG             = 0x51300010,
 60         PCI_IDE_CFG             = 0x40,
 61 
 62         CFG                     = 0,
 63         DTC                     = 2,
 64         CAST                    = 3,
 65         ETC                     = 4,
 66 
 67         IDE_CFG_CHANEN          = (1 << 1),
 68         IDE_CFG_CABLE           = (1 << 17) | (1 << 16),
 69 
 70         IDE_D0_SHIFT            = 24,
 71         IDE_D1_SHIFT            = 16,
 72         IDE_DRV_MASK            = 0xff,
 73 
 74         IDE_CAST_D0_SHIFT       = 6,
 75         IDE_CAST_D1_SHIFT       = 4,
 76         IDE_CAST_DRV_MASK       = 0x3,
 77         IDE_CAST_CMD_MASK       = 0xff,
 78         IDE_CAST_CMD_SHIFT      = 24,
 79 
 80         IDE_ETC_UDMA_MASK       = 0xc0,
 81 };
 82 
 83 /* Some Bachmann OT200 devices have a non working UDMA support due a
 84  * missing resistor.
 85  */
 86 static const struct dmi_system_id udma_quirk_dmi_table[] = {
 87         {
 88                 .ident = "Bachmann electronic OT200",
 89                 .matches = {
 90                         DMI_MATCH(DMI_SYS_VENDOR, "Bachmann electronic"),
 91                         DMI_MATCH(DMI_PRODUCT_NAME, "OT200"),
 92                         DMI_MATCH(DMI_PRODUCT_VERSION, "1")
 93                 },
 94         },
 95         { }
 96 };
 97 
 98 static 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_IDE_CFG + reg, *val, dummy);
104                 return 0;
105         }
106 
107         return pci_read_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
108 }
109 
110 static int cs5536_write(struct pci_dev *pdev, int reg, int val)
111 {
112         if (unlikely(use_msr)) {
113                 wrmsr(MSR_IDE_CFG + reg, val, 0);
114                 return 0;
115         }
116 
117         return pci_write_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
118 }
119 
120 static void cs5536_program_dtc(struct ata_device *adev, u8 tim)
121 {
122         struct pci_dev *pdev = to_pci_dev(adev->link->ap->host->dev);
123         int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
124         u32 dtc;
125 
126         cs5536_read(pdev, DTC, &dtc);
127         dtc &= ~(IDE_DRV_MASK << dshift);
128         dtc |= tim << dshift;
129         cs5536_write(pdev, DTC, dtc);
130 }
131 
132 /**
133  *      cs5536_cable_detect     -       detect cable type
134  *      @ap: Port to detect on
135  *
136  *      Perform cable detection for ATA66 capable cable.
137  *
138  *      Returns a cable type.
139  */
140 
141 static int cs5536_cable_detect(struct ata_port *ap)
142 {
143         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
144         u32 cfg;
145 
146         cs5536_read(pdev, CFG, &cfg);
147 
148         if (cfg & IDE_CFG_CABLE)
149                 return ATA_CBL_PATA80;
150         else
151                 return ATA_CBL_PATA40;
152 }
153 
154 /**
155  *      cs5536_set_piomode              -       PIO setup
156  *      @ap: ATA interface
157  *      @adev: device on the interface
158  */
159 
160 static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev)
161 {
162         static const u8 drv_timings[5] = {
163                 0x98, 0x55, 0x32, 0x21, 0x20,
164         };
165 
166         static const u8 addr_timings[5] = {
167                 0x2, 0x1, 0x0, 0x0, 0x0,
168         };
169 
170         static const u8 cmd_timings[5] = {
171                 0x99, 0x92, 0x90, 0x22, 0x20,
172         };
173 
174         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
175         struct ata_device *pair = ata_dev_pair(adev);
176         int mode = adev->pio_mode - XFER_PIO_0;
177         int cmdmode = mode;
178         int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
179         u32 cast;
180 
181         if (pair)
182                 cmdmode = min(mode, pair->pio_mode - XFER_PIO_0);
183 
184         cs5536_program_dtc(adev, drv_timings[mode]);
185 
186         cs5536_read(pdev, CAST, &cast);
187 
188         cast &= ~(IDE_CAST_DRV_MASK << cshift);
189         cast |= addr_timings[mode] << cshift;
190 
191         cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT);
192         cast |= cmd_timings[cmdmode] << IDE_CAST_CMD_SHIFT;
193 
194         cs5536_write(pdev, CAST, cast);
195 }
196 
197 /**
198  *      cs5536_set_dmamode              -       DMA timing setup
199  *      @ap: ATA interface
200  *      @adev: Device being configured
201  *
202  */
203 
204 static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev)
205 {
206         static const u8 udma_timings[6] = {
207                 0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6,
208         };
209 
210         static const u8 mwdma_timings[3] = {
211                 0x67, 0x21, 0x20,
212         };
213 
214         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
215         u32 etc;
216         int mode = adev->dma_mode;
217         int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
218 
219         cs5536_read(pdev, ETC, &etc);
220 
221         if (mode >= XFER_UDMA_0) {
222                 etc &= ~(IDE_DRV_MASK << dshift);
223                 etc |= udma_timings[mode - XFER_UDMA_0] << dshift;
224         } else { /* MWDMA */
225                 etc &= ~(IDE_ETC_UDMA_MASK << dshift);
226                 cs5536_program_dtc(adev, mwdma_timings[mode - XFER_MW_DMA_0]);
227         }
228 
229         cs5536_write(pdev, ETC, etc);
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         static const struct ata_port_info no_udma_info = {
261                 .flags = ATA_FLAG_SLAVE_POSS,
262                 .pio_mask = ATA_PIO4,
263                 .port_ops = &cs5536_port_ops,
264         };
265 
266 
267         const struct ata_port_info *ppi[2];
268         u32 cfg;
269 
270         if (dmi_check_system(udma_quirk_dmi_table))
271                 ppi[0] = &no_udma_info;
272         else
273                 ppi[0] = &info;
274 
275         ppi[1] = &ata_dummy_port_info;
276 
277         if (use_msr)
278                 printk(KERN_ERR DRV_NAME ": Using MSR regs instead of PCI\n");
279 
280         cs5536_read(dev, CFG, &cfg);
281 
282         if ((cfg & IDE_CFG_CHANEN) == 0) {
283                 printk(KERN_ERR DRV_NAME ": disabled by BIOS\n");
284                 return -ENODEV;
285         }
286 
287         return ata_pci_bmdma_init_one(dev, ppi, &cs5536_sht, NULL, 0);
288 }
289 
290 static const struct pci_device_id cs5536[] = {
291         { PCI_VDEVICE(AMD,      PCI_DEVICE_ID_AMD_CS5536_IDE), },
292         { },
293 };
294 
295 static struct pci_driver cs5536_pci_driver = {
296         .name           = DRV_NAME,
297         .id_table       = cs5536,
298         .probe          = cs5536_init_one,
299         .remove         = ata_pci_remove_one,
300 #ifdef CONFIG_PM_SLEEP
301         .suspend        = ata_pci_device_suspend,
302         .resume         = ata_pci_device_resume,
303 #endif
304 };
305 
306 module_pci_driver(cs5536_pci_driver);
307 
308 MODULE_AUTHOR("Martin K. Petersen");
309 MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
310 MODULE_LICENSE("GPL");
311 MODULE_DEVICE_TABLE(pci, cs5536);
312 MODULE_VERSION(DRV_VERSION);
313 

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