1 /*
2  * Linux driver attachment glue for PCI based U320 controllers.
3  *
4  * Copyright (c) 2000-2001 Adaptec Inc.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions, and the following disclaimer,
12  *    without modification.
13  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
14  *    substantially similar to the "NO WARRANTY" disclaimer below
15  *    ("Disclaimer") and any redistribution must be conditioned upon
16  *    including a substantially similar Disclaimer requirement for further
17  *    binary redistribution.
18  * 3. Neither the names of the above-listed copyright holders nor the names
19  *    of any contributors may be used to endorse or promote products derived
20  *    from this software without specific prior written permission.
21  *
22  * Alternatively, this software may be distributed under the terms of the
23  * GNU General Public License ("GPL") version 2 as published by the Free
24  * Software Foundation.
25  *
26  * NO WARRANTY
27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
30  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
35  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
36  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37  * POSSIBILITY OF SUCH DAMAGES.
38  *
39  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic79xx_osm_pci.c#25 $
40  */
41 
42 #include "aic79xx_osm.h"
43 #include "aic79xx_inline.h"
44 #include "aic79xx_pci.h"
45 
46 /* Define the macro locally since it's different for different class of chips.
47  */
48 #define ID(x)            \
49 	ID2C(x),         \
50 	ID2C(IDIROC(x))
51 
52 static const struct pci_device_id ahd_linux_pci_id_table[] = {
53 	/* aic7901 based controllers */
54 	ID(ID_AHA_29320A),
55 	ID(ID_AHA_29320ALP),
56 	ID(ID_AHA_29320LPE),
57 	/* aic7902 based controllers */
58 	ID(ID_AHA_29320),
59 	ID(ID_AHA_29320B),
60 	ID(ID_AHA_29320LP),
61 	ID(ID_AHA_39320),
62 	ID(ID_AHA_39320_B),
63 	ID(ID_AHA_39320A),
64 	ID(ID_AHA_39320D),
65 	ID(ID_AHA_39320D_HP),
66 	ID(ID_AHA_39320D_B),
67 	ID(ID_AHA_39320D_B_HP),
68 	/* Generic chip probes for devices we don't know exactly. */
69 	ID16(ID_AIC7901 & ID_9005_GENERIC_MASK),
70 	ID(ID_AIC7901A & ID_DEV_VENDOR_MASK),
71 	ID16(ID_AIC7902 & ID_9005_GENERIC_MASK),
72 	{ 0 }
73 };
74 
75 MODULE_DEVICE_TABLE(pci, ahd_linux_pci_id_table);
76 
77 #ifdef CONFIG_PM
78 static int
79 ahd_linux_pci_dev_suspend(struct pci_dev *pdev, pm_message_t mesg)
80 {
81 	struct ahd_softc *ahd = pci_get_drvdata(pdev);
82 	int rc;
83 
84 	if ((rc = ahd_suspend(ahd)))
85 		return rc;
86 
87 	ahd_pci_suspend(ahd);
88 
89 	pci_save_state(pdev);
90 	pci_disable_device(pdev);
91 
92 	if (mesg.event & PM_EVENT_SLEEP)
93 		pci_set_power_state(pdev, PCI_D3hot);
94 
95 	return rc;
96 }
97 
98 static int
99 ahd_linux_pci_dev_resume(struct pci_dev *pdev)
100 {
101 	struct ahd_softc *ahd = pci_get_drvdata(pdev);
102 	int rc;
103 
104 	pci_set_power_state(pdev, PCI_D0);
105 	pci_restore_state(pdev);
106 
107 	if ((rc = pci_enable_device(pdev))) {
108 		dev_printk(KERN_ERR, &pdev->dev,
109 			   "failed to enable device after resume (%d)\n", rc);
110 		return rc;
111 	}
112 
113 	pci_set_master(pdev);
114 
115 	ahd_pci_resume(ahd);
116 
117 	ahd_resume(ahd);
118 
119 	return rc;
120 }
121 #endif
122 
123 static void
124 ahd_linux_pci_dev_remove(struct pci_dev *pdev)
125 {
126 	struct ahd_softc *ahd = pci_get_drvdata(pdev);
127 	u_long s;
128 
129 	if (ahd->platform_data && ahd->platform_data->host)
130 			scsi_remove_host(ahd->platform_data->host);
131 
132 	ahd_lock(ahd, &s);
133 	ahd_intr_enable(ahd, FALSE);
134 	ahd_unlock(ahd, &s);
135 	ahd_free(ahd);
136 }
137 
138 static void
139 ahd_linux_pci_inherit_flags(struct ahd_softc *ahd)
140 {
141 	struct pci_dev *pdev = ahd->dev_softc, *master_pdev;
142 	unsigned int master_devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
143 
144 	master_pdev = pci_get_slot(pdev->bus, master_devfn);
145 	if (master_pdev) {
146 		struct ahd_softc *master = pci_get_drvdata(master_pdev);
147 		if (master) {
148 			ahd->flags &= ~AHD_BIOS_ENABLED;
149 			ahd->flags |= master->flags & AHD_BIOS_ENABLED;
150 		} else
151 			printk(KERN_ERR "aic79xx: no multichannel peer found!\n");
152 		pci_dev_put(master_pdev);
153 	}
154 }
155 
156 static int
157 ahd_linux_pci_dev_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
158 {
159 	char		 buf[80];
160 	struct		 ahd_softc *ahd;
161 	ahd_dev_softc_t	 pci;
162 	const struct ahd_pci_identity *entry;
163 	char		*name;
164 	int		 error;
165 	struct device	*dev = &pdev->dev;
166 
167 	pci = pdev;
168 	entry = ahd_find_pci_device(pci);
169 	if (entry == NULL)
170 		return (-ENODEV);
171 
172 	/*
173 	 * Allocate a softc for this card and
174 	 * set it up for attachment by our
175 	 * common detect routine.
176 	 */
177 	sprintf(buf, "ahd_pci:%d:%d:%d",
178 		ahd_get_pci_bus(pci),
179 		ahd_get_pci_slot(pci),
180 		ahd_get_pci_function(pci));
181 	name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
182 	if (name == NULL)
183 		return (-ENOMEM);
184 	strcpy(name, buf);
185 	ahd = ahd_alloc(NULL, name);
186 	if (ahd == NULL)
187 		return (-ENOMEM);
188 	if (pci_enable_device(pdev)) {
189 		ahd_free(ahd);
190 		return (-ENODEV);
191 	}
192 	pci_set_master(pdev);
193 
194 	if (sizeof(dma_addr_t) > 4) {
195 		const u64 required_mask = dma_get_required_mask(dev);
196 
197 		if (required_mask > DMA_BIT_MASK(39) &&
198 		    dma_set_mask(dev, DMA_BIT_MASK(64)) == 0)
199 			ahd->flags |= AHD_64BIT_ADDRESSING;
200 		else if (required_mask > DMA_BIT_MASK(32) &&
201 			 dma_set_mask(dev, DMA_BIT_MASK(39)) == 0)
202 			ahd->flags |= AHD_39BIT_ADDRESSING;
203 		else
204 			dma_set_mask(dev, DMA_BIT_MASK(32));
205 	} else {
206 		dma_set_mask(dev, DMA_BIT_MASK(32));
207 	}
208 	ahd->dev_softc = pci;
209 	error = ahd_pci_config(ahd, entry);
210 	if (error != 0) {
211 		ahd_free(ahd);
212 		return (-error);
213 	}
214 
215 	/*
216 	 * Second Function PCI devices need to inherit some
217 	 * * settings from function 0.
218 	 */
219 	if ((ahd->features & AHD_MULTI_FUNC) && PCI_FUNC(pdev->devfn) != 0)
220 		ahd_linux_pci_inherit_flags(ahd);
221 
222 	pci_set_drvdata(pdev, ahd);
223 
224 	ahd_linux_register_host(ahd, &aic79xx_driver_template);
225 	return (0);
226 }
227 
228 static struct pci_driver aic79xx_pci_driver = {
229 	.name		= "aic79xx",
230 	.probe		= ahd_linux_pci_dev_probe,
231 #ifdef CONFIG_PM
232 	.suspend	= ahd_linux_pci_dev_suspend,
233 	.resume		= ahd_linux_pci_dev_resume,
234 #endif
235 	.remove		= ahd_linux_pci_dev_remove,
236 	.id_table	= ahd_linux_pci_id_table
237 };
238 
239 int
240 ahd_linux_pci_init(void)
241 {
242 	return pci_register_driver(&aic79xx_pci_driver);
243 }
244 
245 void
246 ahd_linux_pci_exit(void)
247 {
248 	pci_unregister_driver(&aic79xx_pci_driver);
249 }
250 
251 static int
252 ahd_linux_pci_reserve_io_regions(struct ahd_softc *ahd, resource_size_t *base,
253 				 resource_size_t *base2)
254 {
255 	*base = pci_resource_start(ahd->dev_softc, 0);
256 	/*
257 	 * This is really the 3rd bar and should be at index 2,
258 	 * but the Linux PCI code doesn't know how to "count" 64bit
259 	 * bars.
260 	 */
261 	*base2 = pci_resource_start(ahd->dev_softc, 3);
262 	if (*base == 0 || *base2 == 0)
263 		return (ENOMEM);
264 	if (!request_region(*base, 256, "aic79xx"))
265 		return (ENOMEM);
266 	if (!request_region(*base2, 256, "aic79xx")) {
267 		release_region(*base, 256);
268 		return (ENOMEM);
269 	}
270 	return (0);
271 }
272 
273 static int
274 ahd_linux_pci_reserve_mem_region(struct ahd_softc *ahd,
275 				 resource_size_t *bus_addr,
276 				 uint8_t __iomem **maddr)
277 {
278 	resource_size_t	start;
279 	resource_size_t	base_page;
280 	u_long	base_offset;
281 	int	error = 0;
282 
283 	if (aic79xx_allow_memio == 0)
284 		return (ENOMEM);
285 
286 	if ((ahd->bugs & AHD_PCIX_MMAPIO_BUG) != 0)
287 		return (ENOMEM);
288 
289 	start = pci_resource_start(ahd->dev_softc, 1);
290 	base_page = start & PAGE_MASK;
291 	base_offset = start - base_page;
292 	if (start != 0) {
293 		*bus_addr = start;
294 		if (!request_mem_region(start, 0x1000, "aic79xx"))
295 			error = ENOMEM;
296 		if (!error) {
297 			*maddr = ioremap_nocache(base_page, base_offset + 512);
298 			if (*maddr == NULL) {
299 				error = ENOMEM;
300 				release_mem_region(start, 0x1000);
301 			} else
302 				*maddr += base_offset;
303 		}
304 	} else
305 		error = ENOMEM;
306 	return (error);
307 }
308 
309 int
310 ahd_pci_map_registers(struct ahd_softc *ahd)
311 {
312 	uint32_t command;
313 	resource_size_t base;
314 	uint8_t	__iomem *maddr;
315 	int	 error;
316 
317 	/*
318 	 * If its allowed, we prefer memory mapped access.
319 	 */
320 	command = ahd_pci_read_config(ahd->dev_softc, PCIR_COMMAND, 4);
321 	command &= ~(PCIM_CMD_PORTEN|PCIM_CMD_MEMEN);
322 	base = 0;
323 	maddr = NULL;
324 	error = ahd_linux_pci_reserve_mem_region(ahd, &base, &maddr);
325 	if (error == 0) {
326 		ahd->platform_data->mem_busaddr = base;
327 		ahd->tags[0] = BUS_SPACE_MEMIO;
328 		ahd->bshs[0].maddr = maddr;
329 		ahd->tags[1] = BUS_SPACE_MEMIO;
330 		ahd->bshs[1].maddr = maddr + 0x100;
331 		ahd_pci_write_config(ahd->dev_softc, PCIR_COMMAND,
332 				     command | PCIM_CMD_MEMEN, 4);
333 
334 		if (ahd_pci_test_register_access(ahd) != 0) {
335 
336 			printk("aic79xx: PCI Device %d:%d:%d "
337 			       "failed memory mapped test.  Using PIO.\n",
338 			       ahd_get_pci_bus(ahd->dev_softc),
339 			       ahd_get_pci_slot(ahd->dev_softc),
340 			       ahd_get_pci_function(ahd->dev_softc));
341 			iounmap(maddr);
342 			release_mem_region(ahd->platform_data->mem_busaddr,
343 					   0x1000);
344 			ahd->bshs[0].maddr = NULL;
345 			maddr = NULL;
346 		} else
347 			command |= PCIM_CMD_MEMEN;
348 	} else if (bootverbose) {
349 		printk("aic79xx: PCI%d:%d:%d MEM region 0x%llx "
350 		       "unavailable. Cannot memory map device.\n",
351 		       ahd_get_pci_bus(ahd->dev_softc),
352 		       ahd_get_pci_slot(ahd->dev_softc),
353 		       ahd_get_pci_function(ahd->dev_softc),
354 		       (unsigned long long)base);
355 	}
356 
357 	if (maddr == NULL) {
358 		resource_size_t base2;
359 
360 		error = ahd_linux_pci_reserve_io_regions(ahd, &base, &base2);
361 		if (error == 0) {
362 			ahd->tags[0] = BUS_SPACE_PIO;
363 			ahd->tags[1] = BUS_SPACE_PIO;
364 			ahd->bshs[0].ioport = (u_long)base;
365 			ahd->bshs[1].ioport = (u_long)base2;
366 			command |= PCIM_CMD_PORTEN;
367 		} else {
368 			printk("aic79xx: PCI%d:%d:%d IO regions 0x%llx and "
369 			       "0x%llx unavailable. Cannot map device.\n",
370 			       ahd_get_pci_bus(ahd->dev_softc),
371 			       ahd_get_pci_slot(ahd->dev_softc),
372 			       ahd_get_pci_function(ahd->dev_softc),
373 			       (unsigned long long)base,
374 			       (unsigned long long)base2);
375 		}
376 	}
377 	ahd_pci_write_config(ahd->dev_softc, PCIR_COMMAND, command, 4);
378 	return (error);
379 }
380 
381 int
382 ahd_pci_map_int(struct ahd_softc *ahd)
383 {
384 	int error;
385 
386 	error = request_irq(ahd->dev_softc->irq, ahd_linux_isr,
387 			    IRQF_SHARED, "aic79xx", ahd);
388 	if (!error)
389 		ahd->platform_data->irq = ahd->dev_softc->irq;
390 
391 	return (-error);
392 }
393 
394 void
395 ahd_power_state_change(struct ahd_softc *ahd, ahd_power_state new_state)
396 {
397 	pci_set_power_state(ahd->dev_softc, new_state);
398 }
399