2 * pata_rdc - Driver for later RDC PATA controllers
4 * This is actually a driver for hardware meeting
5 * INCITS 370-2004 (1510D): ATA Host Adapter Standards
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; see the file COPYING. If not, write to
21 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/pci.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/delay.h>
30 #include <linux/device.h>
31 #include <scsi/scsi_host.h>
32 #include <linux/libata.h>
33 #include <linux/dmi.h>
35 #define DRV_NAME "pata_rdc"
36 #define DRV_VERSION "0.01"
38 struct rdc_host_priv {
43 * rdc_pata_cable_detect - Probe host controller cable detect info
44 * @ap: Port for which cable detect info is desired
46 * Read 80c cable indicator from ATA PCI device's PCI config
47 * register. This register is normally set by firmware (BIOS).
50 * None (inherited from caller).
53 static int rdc_pata_cable_detect(struct ata_port *ap)
55 struct rdc_host_priv *hpriv = ap->host->private_data;
58 /* check BIOS cable detect results */
59 mask = 0x30 << (2 * ap->port_no);
60 if ((hpriv->saved_iocfg & mask) == 0)
61 return ATA_CBL_PATA40;
62 return ATA_CBL_PATA80;
66 * rdc_pata_prereset - prereset for PATA host controller
68 * @deadline: deadline jiffies for the operation
71 * None (inherited from caller).
73 static int rdc_pata_prereset(struct ata_link *link, unsigned long deadline)
75 struct ata_port *ap = link->ap;
76 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
78 static const struct pci_bits rdc_enable_bits[] = {
79 { 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
80 { 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */
83 if (!pci_test_config_bits(pdev, &rdc_enable_bits[ap->port_no]))
85 return ata_sff_prereset(link, deadline);
89 * rdc_set_piomode - Initialize host controller PATA PIO timings
90 * @ap: Port whose timings we are configuring
93 * Set PIO mode for device, in host controller PCI config space.
96 * None (inherited from caller).
99 static void rdc_set_piomode(struct ata_port *ap, struct ata_device *adev)
101 unsigned int pio = adev->pio_mode - XFER_PIO_0;
102 struct pci_dev *dev = to_pci_dev(ap->host->dev);
103 unsigned int is_slave = (adev->devno != 0);
104 unsigned int master_port= ap->port_no ? 0x42 : 0x40;
105 unsigned int slave_port = 0x44;
111 static const /* ISP RTC */
112 u8 timings[][2] = { { 0, 0 },
119 control |= 1; /* TIME1 enable */
120 if (ata_pio_need_iordy(adev))
121 control |= 2; /* IE enable */
123 if (adev->class == ATA_DEV_ATA)
124 control |= 4; /* PPE enable */
126 /* PIO configuration clears DTE unconditionally. It will be
127 * programmed in set_dmamode which is guaranteed to be called
128 * after set_piomode if any DMA mode is available.
130 pci_read_config_word(dev, master_port, &master_data);
132 /* clear TIME1|IE1|PPE1|DTE1 */
133 master_data &= 0xff0f;
134 /* Enable SITRE (separate slave timing register) */
135 master_data |= 0x4000;
136 /* enable PPE1, IE1 and TIME1 as needed */
137 master_data |= (control << 4);
138 pci_read_config_byte(dev, slave_port, &slave_data);
139 slave_data &= (ap->port_no ? 0x0f : 0xf0);
140 /* Load the timing nibble for this slave */
141 slave_data |= ((timings[pio][0] << 2) | timings[pio][1])
142 << (ap->port_no ? 4 : 0);
144 /* clear ISP|RCT|TIME0|IE0|PPE0|DTE0 */
145 master_data &= 0xccf0;
146 /* Enable PPE, IE and TIME as appropriate */
147 master_data |= control;
148 /* load ISP and RCT */
150 (timings[pio][0] << 12) |
151 (timings[pio][1] << 8);
153 pci_write_config_word(dev, master_port, master_data);
155 pci_write_config_byte(dev, slave_port, slave_data);
157 /* Ensure the UDMA bit is off - it will be turned back on if
160 pci_read_config_byte(dev, 0x48, &udma_enable);
161 udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
162 pci_write_config_byte(dev, 0x48, udma_enable);
166 * rdc_set_dmamode - Initialize host controller PATA PIO timings
167 * @ap: Port whose timings we are configuring
168 * @adev: Drive in question
170 * Set UDMA mode for device, in host controller PCI config space.
173 * None (inherited from caller).
176 static void rdc_set_dmamode(struct ata_port *ap, struct ata_device *adev)
178 struct pci_dev *dev = to_pci_dev(ap->host->dev);
179 u8 master_port = ap->port_no ? 0x42 : 0x40;
181 u8 speed = adev->dma_mode;
182 int devid = adev->devno + 2 * ap->port_no;
185 static const /* ISP RTC */
186 u8 timings[][2] = { { 0, 0 },
192 pci_read_config_word(dev, master_port, &master_data);
193 pci_read_config_byte(dev, 0x48, &udma_enable);
195 if (speed >= XFER_UDMA_0) {
196 unsigned int udma = adev->dma_mode - XFER_UDMA_0;
199 int u_clock, u_speed;
202 * UDMA is handled by a combination of clock switching and
203 * selection of dividers
205 * Handy rule: Odd modes are UDMATIMx 01, even are 02
206 * except UDMA0 which is 00
208 u_speed = min(2 - (udma & 1), udma);
210 u_clock = 0x1000; /* 100Mhz */
212 u_clock = 1; /* 66Mhz */
214 u_clock = 0; /* 33Mhz */
216 udma_enable |= (1 << devid);
218 /* Load the CT/RP selection */
219 pci_read_config_word(dev, 0x4A, &udma_timing);
220 udma_timing &= ~(3 << (4 * devid));
221 udma_timing |= u_speed << (4 * devid);
222 pci_write_config_word(dev, 0x4A, udma_timing);
224 /* Select a 33/66/100Mhz clock */
225 pci_read_config_word(dev, 0x54, &ideconf);
226 ideconf &= ~(0x1001 << devid);
227 ideconf |= u_clock << devid;
228 pci_write_config_word(dev, 0x54, ideconf);
231 * MWDMA is driven by the PIO timings. We must also enable
232 * IORDY unconditionally along with TIME1. PPE has already
233 * been set when the PIO timing was set.
235 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
236 unsigned int control;
238 const unsigned int needed_pio[3] = {
239 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
241 int pio = needed_pio[mwdma] - XFER_PIO_0;
243 control = 3; /* IORDY|TIME1 */
245 /* If the drive MWDMA is faster than it can do PIO then
246 we must force PIO into PIO0 */
248 if (adev->pio_mode < needed_pio[mwdma])
249 /* Enable DMA timing only */
250 control |= 8; /* PIO cycles in PIO0 */
252 if (adev->devno) { /* Slave */
253 master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */
254 master_data |= control << 4;
255 pci_read_config_byte(dev, 0x44, &slave_data);
256 slave_data &= (ap->port_no ? 0x0f : 0xf0);
257 /* Load the matching timing */
258 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
259 pci_write_config_byte(dev, 0x44, slave_data);
260 } else { /* Master */
261 master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY
262 and master timing bits */
263 master_data |= control;
265 (timings[pio][0] << 12) |
266 (timings[pio][1] << 8);
269 udma_enable &= ~(1 << devid);
270 pci_write_config_word(dev, master_port, master_data);
272 pci_write_config_byte(dev, 0x48, udma_enable);
275 static struct ata_port_operations rdc_pata_ops = {
276 .inherits = &ata_bmdma32_port_ops,
277 .cable_detect = rdc_pata_cable_detect,
278 .set_piomode = rdc_set_piomode,
279 .set_dmamode = rdc_set_dmamode,
280 .prereset = rdc_pata_prereset,
283 static struct ata_port_info rdc_port_info = {
285 .flags = ATA_FLAG_SLAVE_POSS,
286 .pio_mask = ATA_PIO4,
287 .mwdma_mask = ATA_MWDMA2,
288 .udma_mask = ATA_UDMA5,
289 .port_ops = &rdc_pata_ops,
292 static struct scsi_host_template rdc_sht = {
293 ATA_BMDMA_SHT(DRV_NAME),
297 * rdc_init_one - Register PIIX ATA PCI device with kernel services
298 * @pdev: PCI device to register
299 * @ent: Entry in rdc_pci_tbl matching with @pdev
301 * Called from kernel PCI layer. We probe for combined mode (sigh),
302 * and then hand over control to libata, for it to do the rest.
305 * Inherited from PCI layer (may sleep).
308 * Zero on success, or -ERRNO value.
311 static int __devinit rdc_init_one(struct pci_dev *pdev,
312 const struct pci_device_id *ent)
314 static int printed_version;
315 struct device *dev = &pdev->dev;
316 struct ata_port_info port_info[2];
317 const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] };
318 unsigned long port_flags;
319 struct ata_host *host;
320 struct rdc_host_priv *hpriv;
323 if (!printed_version++)
324 dev_printk(KERN_DEBUG, &pdev->dev,
325 "version " DRV_VERSION "\n");
327 port_info[0] = rdc_port_info;
328 port_info[1] = rdc_port_info;
330 port_flags = port_info[0].flags;
332 /* enable device and prepare host */
333 rc = pcim_enable_device(pdev);
337 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
341 /* Save IOCFG, this will be used for cable detection, quirk
342 * detection and restoration on detach.
344 pci_read_config_dword(pdev, 0x54, &hpriv->saved_iocfg);
346 rc = ata_pci_sff_prepare_host(pdev, ppi, &host);
349 host->private_data = hpriv;
353 host->flags |= ATA_HOST_PARALLEL_SCAN;
355 pci_set_master(pdev);
356 return ata_pci_sff_activate_host(host, ata_sff_interrupt, &rdc_sht);
359 static void rdc_remove_one(struct pci_dev *pdev)
361 struct ata_host *host = dev_get_drvdata(&pdev->dev);
362 struct rdc_host_priv *hpriv = host->private_data;
364 pci_write_config_dword(pdev, 0x54, hpriv->saved_iocfg);
366 ata_pci_remove_one(pdev);
369 static const struct pci_device_id rdc_pci_tbl[] = {
370 { PCI_DEVICE(0x17F3, 0x1011), },
371 { PCI_DEVICE(0x17F3, 0x1012), },
372 { } /* terminate list */
375 static struct pci_driver rdc_pci_driver = {
377 .id_table = rdc_pci_tbl,
378 .probe = rdc_init_one,
379 .remove = rdc_remove_one,
383 static int __init rdc_init(void)
385 return pci_register_driver(&rdc_pci_driver);
388 static void __exit rdc_exit(void)
390 pci_unregister_driver(&rdc_pci_driver);
393 module_init(rdc_init);
394 module_exit(rdc_exit);
396 MODULE_AUTHOR("Alan Cox (based on ata_piix)");
397 MODULE_DESCRIPTION("SCSI low-level driver for RDC PATA controllers");
398 MODULE_LICENSE("GPL");
399 MODULE_DEVICE_TABLE(pci, rdc_pci_tbl);
400 MODULE_VERSION(DRV_VERSION);