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Linux/drivers/ata/pata_cs5520.c

  1 /*
  2  *      IDE tuning and bus mastering support for the CS5510/CS5520
  3  *      chipsets
  4  *
  5  *      The CS5510/CS5520 are slightly unusual devices. Unlike the
  6  *      typical IDE controllers they do bus mastering with the drive in
  7  *      PIO mode and smarter silicon.
  8  *
  9  *      The practical upshot of this is that we must always tune the
 10  *      drive for the right PIO mode. We must also ignore all the blacklists
 11  *      and the drive bus mastering DMA information. Also to confuse matters
 12  *      further we can do DMA on PIO only drives.
 13  *
 14  *      DMA on the 5510 also requires we disable_hlt() during DMA on early
 15  *      revisions.
 16  *
 17  *      *** This driver is strictly experimental ***
 18  *
 19  *      (c) Copyright Red Hat Inc 2002
 20  *
 21  * This program is free software; you can redistribute it and/or modify it
 22  * under the terms of the GNU General Public License as published by the
 23  * Free Software Foundation; either version 2, or (at your option) any
 24  * later version.
 25  *
 26  * This program is distributed in the hope that it will be useful, but
 27  * WITHOUT ANY WARRANTY; without even the implied warranty of
 28  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 29  * General Public License for more details.
 30  *
 31  * Documentation:
 32  *      Not publicly available.
 33  */
 34 #include <linux/kernel.h>
 35 #include <linux/module.h>
 36 #include <linux/pci.h>
 37 #include <linux/blkdev.h>
 38 #include <linux/delay.h>
 39 #include <scsi/scsi_host.h>
 40 #include <linux/libata.h>
 41 
 42 #define DRV_NAME        "pata_cs5520"
 43 #define DRV_VERSION     "0.6.6"
 44 
 45 struct pio_clocks
 46 {
 47         int address;
 48         int assert;
 49         int recovery;
 50 };
 51 
 52 static const struct pio_clocks cs5520_pio_clocks[]={
 53         {3, 6, 11},
 54         {2, 5, 6},
 55         {1, 4, 3},
 56         {1, 3, 2},
 57         {1, 2, 1}
 58 };
 59 
 60 /**
 61  *      cs5520_set_timings      -       program PIO timings
 62  *      @ap: ATA port
 63  *      @adev: ATA device
 64  *
 65  *      Program the PIO mode timings for the controller according to the pio
 66  *      clocking table.
 67  */
 68 
 69 static void cs5520_set_timings(struct ata_port *ap, struct ata_device *adev, int pio)
 70 {
 71         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 72         int slave = adev->devno;
 73 
 74         pio -= XFER_PIO_0;
 75 
 76         /* Channel command timing */
 77         pci_write_config_byte(pdev, 0x62 + ap->port_no,
 78                                 (cs5520_pio_clocks[pio].recovery << 4) |
 79                                 (cs5520_pio_clocks[pio].assert));
 80         /* FIXME: should these use address ? */
 81         /* Read command timing */
 82         pci_write_config_byte(pdev, 0x64 +  4*ap->port_no + slave,
 83                                 (cs5520_pio_clocks[pio].recovery << 4) |
 84                                 (cs5520_pio_clocks[pio].assert));
 85         /* Write command timing */
 86         pci_write_config_byte(pdev, 0x66 +  4*ap->port_no + slave,
 87                                 (cs5520_pio_clocks[pio].recovery << 4) |
 88                                 (cs5520_pio_clocks[pio].assert));
 89 }
 90 
 91 /**
 92  *      cs5520_set_piomode      -       program PIO timings
 93  *      @ap: ATA port
 94  *      @adev: ATA device
 95  *
 96  *      Program the PIO mode timings for the controller according to the pio
 97  *      clocking table.
 98  */
 99 
100 static void cs5520_set_piomode(struct ata_port *ap, struct ata_device *adev)
101 {
102         cs5520_set_timings(ap, adev, adev->pio_mode);
103 }
104 
105 static struct scsi_host_template cs5520_sht = {
106         ATA_BMDMA_SHT(DRV_NAME),
107         .sg_tablesize           = LIBATA_DUMB_MAX_PRD,
108 };
109 
110 static struct ata_port_operations cs5520_port_ops = {
111         .inherits               = &ata_bmdma_port_ops,
112         .qc_prep                = ata_bmdma_dumb_qc_prep,
113         .cable_detect           = ata_cable_40wire,
114         .set_piomode            = cs5520_set_piomode,
115 };
116 
117 static int cs5520_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
118 {
119         static const unsigned int cmd_port[] = { 0x1F0, 0x170 };
120         static const unsigned int ctl_port[] = { 0x3F6, 0x376 };
121         struct ata_port_info pi = {
122                 .flags          = ATA_FLAG_SLAVE_POSS,
123                 .pio_mask       = ATA_PIO4,
124                 .port_ops       = &cs5520_port_ops,
125         };
126         const struct ata_port_info *ppi[2];
127         u8 pcicfg;
128         void __iomem *iomap[5];
129         struct ata_host *host;
130         struct ata_ioports *ioaddr;
131         int i, rc;
132 
133         rc = pcim_enable_device(pdev);
134         if (rc)
135                 return rc;
136 
137         /* IDE port enable bits */
138         pci_read_config_byte(pdev, 0x60, &pcicfg);
139 
140         /* Check if the ATA ports are enabled */
141         if ((pcicfg & 3) == 0)
142                 return -ENODEV;
143 
144         ppi[0] = ppi[1] = &ata_dummy_port_info;
145         if (pcicfg & 1)
146                 ppi[0] = &pi;
147         if (pcicfg & 2)
148                 ppi[1] = &pi;
149 
150         if ((pcicfg & 0x40) == 0) {
151                 dev_warn(&pdev->dev, "DMA mode disabled. Enabling.\n");
152                 pci_write_config_byte(pdev, 0x60, pcicfg | 0x40);
153         }
154 
155         pi.mwdma_mask = id->driver_data;
156 
157         host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
158         if (!host)
159                 return -ENOMEM;
160 
161         /* Perform set up for DMA */
162         if (pci_enable_device_io(pdev)) {
163                 printk(KERN_ERR DRV_NAME ": unable to configure BAR2.\n");
164                 return -ENODEV;
165         }
166 
167         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
168                 printk(KERN_ERR DRV_NAME ": unable to configure DMA mask.\n");
169                 return -ENODEV;
170         }
171         if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32))) {
172                 printk(KERN_ERR DRV_NAME ": unable to configure consistent DMA mask.\n");
173                 return -ENODEV;
174         }
175 
176         /* Map IO ports and initialize host accordingly */
177         iomap[0] = devm_ioport_map(&pdev->dev, cmd_port[0], 8);
178         iomap[1] = devm_ioport_map(&pdev->dev, ctl_port[0], 1);
179         iomap[2] = devm_ioport_map(&pdev->dev, cmd_port[1], 8);
180         iomap[3] = devm_ioport_map(&pdev->dev, ctl_port[1], 1);
181         iomap[4] = pcim_iomap(pdev, 2, 0);
182 
183         if (!iomap[0] || !iomap[1] || !iomap[2] || !iomap[3] || !iomap[4])
184                 return -ENOMEM;
185 
186         ioaddr = &host->ports[0]->ioaddr;
187         ioaddr->cmd_addr = iomap[0];
188         ioaddr->ctl_addr = iomap[1];
189         ioaddr->altstatus_addr = iomap[1];
190         ioaddr->bmdma_addr = iomap[4];
191         ata_sff_std_ports(ioaddr);
192 
193         ata_port_desc(host->ports[0],
194                       "cmd 0x%x ctl 0x%x", cmd_port[0], ctl_port[0]);
195         ata_port_pbar_desc(host->ports[0], 4, 0, "bmdma");
196 
197         ioaddr = &host->ports[1]->ioaddr;
198         ioaddr->cmd_addr = iomap[2];
199         ioaddr->ctl_addr = iomap[3];
200         ioaddr->altstatus_addr = iomap[3];
201         ioaddr->bmdma_addr = iomap[4] + 8;
202         ata_sff_std_ports(ioaddr);
203 
204         ata_port_desc(host->ports[1],
205                       "cmd 0x%x ctl 0x%x", cmd_port[1], ctl_port[1]);
206         ata_port_pbar_desc(host->ports[1], 4, 8, "bmdma");
207 
208         /* activate the host */
209         pci_set_master(pdev);
210         rc = ata_host_start(host);
211         if (rc)
212                 return rc;
213 
214         for (i = 0; i < 2; i++) {
215                 static const int irq[] = { 14, 15 };
216                 struct ata_port *ap = host->ports[i];
217 
218                 if (ata_port_is_dummy(ap))
219                         continue;
220 
221                 rc = devm_request_irq(&pdev->dev, irq[ap->port_no],
222                                       ata_bmdma_interrupt, 0, DRV_NAME, host);
223                 if (rc)
224                         return rc;
225 
226                 ata_port_desc(ap, "irq %d", irq[i]);
227         }
228 
229         return ata_host_register(host, &cs5520_sht);
230 }
231 
232 #ifdef CONFIG_PM_SLEEP
233 /**
234  *      cs5520_reinit_one       -       device resume
235  *      @pdev: PCI device
236  *
237  *      Do any reconfiguration work needed by a resume from RAM. We need
238  *      to restore DMA mode support on BIOSen which disabled it
239  */
240 
241 static int cs5520_reinit_one(struct pci_dev *pdev)
242 {
243         struct ata_host *host = pci_get_drvdata(pdev);
244         u8 pcicfg;
245         int rc;
246 
247         rc = ata_pci_device_do_resume(pdev);
248         if (rc)
249                 return rc;
250 
251         pci_read_config_byte(pdev, 0x60, &pcicfg);
252         if ((pcicfg & 0x40) == 0)
253                 pci_write_config_byte(pdev, 0x60, pcicfg | 0x40);
254 
255         ata_host_resume(host);
256         return 0;
257 }
258 
259 /**
260  *      cs5520_pci_device_suspend       -       device suspend
261  *      @pdev: PCI device
262  *
263  *      We have to cut and waste bits from the standard method because
264  *      the 5520 is a bit odd and not just a pure ATA device. As a result
265  *      we must not disable it. The needed code is short and this avoids
266  *      chip specific mess in the core code.
267  */
268 
269 static int cs5520_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
270 {
271         struct ata_host *host = pci_get_drvdata(pdev);
272         int rc = 0;
273 
274         rc = ata_host_suspend(host, mesg);
275         if (rc)
276                 return rc;
277 
278         pci_save_state(pdev);
279         return 0;
280 }
281 #endif /* CONFIG_PM_SLEEP */
282 
283 /* For now keep DMA off. We can set it for all but A rev CS5510 once the
284    core ATA code can handle it */
285 
286 static const struct pci_device_id pata_cs5520[] = {
287         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), },
288         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), },
289 
290         { },
291 };
292 
293 static struct pci_driver cs5520_pci_driver = {
294         .name           = DRV_NAME,
295         .id_table       = pata_cs5520,
296         .probe          = cs5520_init_one,
297         .remove         = ata_pci_remove_one,
298 #ifdef CONFIG_PM_SLEEP
299         .suspend        = cs5520_pci_device_suspend,
300         .resume         = cs5520_reinit_one,
301 #endif
302 };
303 
304 module_pci_driver(cs5520_pci_driver);
305 
306 MODULE_AUTHOR("Alan Cox");
307 MODULE_DESCRIPTION("low-level driver for Cyrix CS5510/5520");
308 MODULE_LICENSE("GPL");
309 MODULE_DEVICE_TABLE(pci, pata_cs5520);
310 MODULE_VERSION(DRV_VERSION);
311 

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