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staging/easycap: don't cast NULL pointer
[wandboard.git] / arch / sparc / kernel / pci_sabre.c
blob5c3f5ec4cabc0ee00d229be774d636eb17b24d77
1 /* pci_sabre.c: Sabre specific PCI controller support.
2 *
3 * Copyright (C) 1997, 1998, 1999, 2007 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1998, 1999 Eddie C. Dost (ecd@skynet.be)
5 * Copyright (C) 1999 Jakub Jelinek (jakub@redhat.com)
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/types.h>
10 #include <linux/pci.h>
11 #include <linux/init.h>
12 #include <linux/slab.h>
13 #include <linux/interrupt.h>
14 #include <linux/of_device.h>
15
16 #include <asm/apb.h>
17 #include <asm/iommu.h>
18 #include <asm/irq.h>
19 #include <asm/prom.h>
20 #include <asm/upa.h>
21
22 #include "pci_impl.h"
23 #include "iommu_common.h"
24 #include "psycho_common.h"
25
26 #define DRIVER_NAME "sabre"
27 #define PFX DRIVER_NAME ": "
28
29 /* SABRE PCI controller register offsets and definitions. */
30 #define SABRE_UE_AFSR 0x0030UL
31 #define SABRE_UEAFSR_PDRD 0x4000000000000000UL /* Primary PCI DMA Read */
32 #define SABRE_UEAFSR_PDWR 0x2000000000000000UL /* Primary PCI DMA Write */
33 #define SABRE_UEAFSR_SDRD 0x0800000000000000UL /* Secondary PCI DMA Read */
34 #define SABRE_UEAFSR_SDWR 0x0400000000000000UL /* Secondary PCI DMA Write */
35 #define SABRE_UEAFSR_SDTE 0x0200000000000000UL /* Secondary DMA Translation Error */
36 #define SABRE_UEAFSR_PDTE 0x0100000000000000UL /* Primary DMA Translation Error */
37 #define SABRE_UEAFSR_BMSK 0x0000ffff00000000UL /* Bytemask */
38 #define SABRE_UEAFSR_OFF 0x00000000e0000000UL /* Offset (AFAR bits [5:3] */
39 #define SABRE_UEAFSR_BLK 0x0000000000800000UL /* Was block operation */
40 #define SABRE_UECE_AFAR 0x0038UL
41 #define SABRE_CE_AFSR 0x0040UL
42 #define SABRE_CEAFSR_PDRD 0x4000000000000000UL /* Primary PCI DMA Read */
43 #define SABRE_CEAFSR_PDWR 0x2000000000000000UL /* Primary PCI DMA Write */
44 #define SABRE_CEAFSR_SDRD 0x0800000000000000UL /* Secondary PCI DMA Read */
45 #define SABRE_CEAFSR_SDWR 0x0400000000000000UL /* Secondary PCI DMA Write */
46 #define SABRE_CEAFSR_ESYND 0x00ff000000000000UL /* ECC Syndrome */
47 #define SABRE_CEAFSR_BMSK 0x0000ffff00000000UL /* Bytemask */
48 #define SABRE_CEAFSR_OFF 0x00000000e0000000UL /* Offset */
49 #define SABRE_CEAFSR_BLK 0x0000000000800000UL /* Was block operation */
50 #define SABRE_UECE_AFAR_ALIAS 0x0048UL /* Aliases to 0x0038 */
51 #define SABRE_IOMMU_CONTROL 0x0200UL
52 #define SABRE_IOMMUCTRL_ERRSTS 0x0000000006000000UL /* Error status bits */
53 #define SABRE_IOMMUCTRL_ERR 0x0000000001000000UL /* Error present in IOTLB */
54 #define SABRE_IOMMUCTRL_LCKEN 0x0000000000800000UL /* IOTLB lock enable */
55 #define SABRE_IOMMUCTRL_LCKPTR 0x0000000000780000UL /* IOTLB lock pointer */
56 #define SABRE_IOMMUCTRL_TSBSZ 0x0000000000070000UL /* TSB Size */
57 #define SABRE_IOMMU_TSBSZ_1K 0x0000000000000000
58 #define SABRE_IOMMU_TSBSZ_2K 0x0000000000010000
59 #define SABRE_IOMMU_TSBSZ_4K 0x0000000000020000
60 #define SABRE_IOMMU_TSBSZ_8K 0x0000000000030000
61 #define SABRE_IOMMU_TSBSZ_16K 0x0000000000040000
62 #define SABRE_IOMMU_TSBSZ_32K 0x0000000000050000
63 #define SABRE_IOMMU_TSBSZ_64K 0x0000000000060000
64 #define SABRE_IOMMU_TSBSZ_128K 0x0000000000070000
65 #define SABRE_IOMMUCTRL_TBWSZ 0x0000000000000004UL /* TSB assumed page size */
66 #define SABRE_IOMMUCTRL_DENAB 0x0000000000000002UL /* Diagnostic Mode Enable */
67 #define SABRE_IOMMUCTRL_ENAB 0x0000000000000001UL /* IOMMU Enable */
68 #define SABRE_IOMMU_TSBBASE 0x0208UL
69 #define SABRE_IOMMU_FLUSH 0x0210UL
70 #define SABRE_IMAP_A_SLOT0 0x0c00UL
71 #define SABRE_IMAP_B_SLOT0 0x0c20UL
72 #define SABRE_IMAP_SCSI 0x1000UL
73 #define SABRE_IMAP_ETH 0x1008UL
74 #define SABRE_IMAP_BPP 0x1010UL
75 #define SABRE_IMAP_AU_REC 0x1018UL
76 #define SABRE_IMAP_AU_PLAY 0x1020UL
77 #define SABRE_IMAP_PFAIL 0x1028UL
78 #define SABRE_IMAP_KMS 0x1030UL
79 #define SABRE_IMAP_FLPY 0x1038UL
80 #define SABRE_IMAP_SHW 0x1040UL
81 #define SABRE_IMAP_KBD 0x1048UL
82 #define SABRE_IMAP_MS 0x1050UL
83 #define SABRE_IMAP_SER 0x1058UL
84 #define SABRE_IMAP_UE 0x1070UL
85 #define SABRE_IMAP_CE 0x1078UL
86 #define SABRE_IMAP_PCIERR 0x1080UL
87 #define SABRE_IMAP_GFX 0x1098UL
88 #define SABRE_IMAP_EUPA 0x10a0UL
89 #define SABRE_ICLR_A_SLOT0 0x1400UL
90 #define SABRE_ICLR_B_SLOT0 0x1480UL
91 #define SABRE_ICLR_SCSI 0x1800UL
92 #define SABRE_ICLR_ETH 0x1808UL
93 #define SABRE_ICLR_BPP 0x1810UL
94 #define SABRE_ICLR_AU_REC 0x1818UL
95 #define SABRE_ICLR_AU_PLAY 0x1820UL
96 #define SABRE_ICLR_PFAIL 0x1828UL
97 #define SABRE_ICLR_KMS 0x1830UL
98 #define SABRE_ICLR_FLPY 0x1838UL
99 #define SABRE_ICLR_SHW 0x1840UL
100 #define SABRE_ICLR_KBD 0x1848UL
101 #define SABRE_ICLR_MS 0x1850UL
102 #define SABRE_ICLR_SER 0x1858UL
103 #define SABRE_ICLR_UE 0x1870UL
104 #define SABRE_ICLR_CE 0x1878UL
105 #define SABRE_ICLR_PCIERR 0x1880UL
106 #define SABRE_WRSYNC 0x1c20UL
107 #define SABRE_PCICTRL 0x2000UL
108 #define SABRE_PCICTRL_MRLEN 0x0000001000000000UL /* Use MemoryReadLine for block loads/stores */
109 #define SABRE_PCICTRL_SERR 0x0000000400000000UL /* Set when SERR asserted on PCI bus */
110 #define SABRE_PCICTRL_ARBPARK 0x0000000000200000UL /* Bus Parking 0=Ultra-IIi 1=prev-bus-owner */
111 #define SABRE_PCICTRL_CPUPRIO 0x0000000000100000UL /* Ultra-IIi granted every other bus cycle */
112 #define SABRE_PCICTRL_ARBPRIO 0x00000000000f0000UL /* Slot which is granted every other bus cycle */
113 #define SABRE_PCICTRL_ERREN 0x0000000000000100UL /* PCI Error Interrupt Enable */
114 #define SABRE_PCICTRL_RTRYWE 0x0000000000000080UL /* DMA Flow Control 0=wait-if-possible 1=retry */
115 #define SABRE_PCICTRL_AEN 0x000000000000000fUL /* Slot PCI arbitration enables */
116 #define SABRE_PIOAFSR 0x2010UL
117 #define SABRE_PIOAFSR_PMA 0x8000000000000000UL /* Primary Master Abort */
118 #define SABRE_PIOAFSR_PTA 0x4000000000000000UL /* Primary Target Abort */
119 #define SABRE_PIOAFSR_PRTRY 0x2000000000000000UL /* Primary Excessive Retries */
120 #define SABRE_PIOAFSR_PPERR 0x1000000000000000UL /* Primary Parity Error */
121 #define SABRE_PIOAFSR_SMA 0x0800000000000000UL /* Secondary Master Abort */
122 #define SABRE_PIOAFSR_STA 0x0400000000000000UL /* Secondary Target Abort */
123 #define SABRE_PIOAFSR_SRTRY 0x0200000000000000UL /* Secondary Excessive Retries */
124 #define SABRE_PIOAFSR_SPERR 0x0100000000000000UL /* Secondary Parity Error */
125 #define SABRE_PIOAFSR_BMSK 0x0000ffff00000000UL /* Byte Mask */
126 #define SABRE_PIOAFSR_BLK 0x0000000080000000UL /* Was Block Operation */
127 #define SABRE_PIOAFAR 0x2018UL
128 #define SABRE_PCIDIAG 0x2020UL
129 #define SABRE_PCIDIAG_DRTRY 0x0000000000000040UL /* Disable PIO Retry Limit */
130 #define SABRE_PCIDIAG_IPAPAR 0x0000000000000008UL /* Invert PIO Address Parity */
131 #define SABRE_PCIDIAG_IPDPAR 0x0000000000000004UL /* Invert PIO Data Parity */
132 #define SABRE_PCIDIAG_IDDPAR 0x0000000000000002UL /* Invert DMA Data Parity */
133 #define SABRE_PCIDIAG_ELPBK 0x0000000000000001UL /* Loopback Enable - not supported */
134 #define SABRE_PCITASR 0x2028UL
135 #define SABRE_PCITASR_EF 0x0000000000000080UL /* Respond to 0xe0000000-0xffffffff */
136 #define SABRE_PCITASR_CD 0x0000000000000040UL /* Respond to 0xc0000000-0xdfffffff */
137 #define SABRE_PCITASR_AB 0x0000000000000020UL /* Respond to 0xa0000000-0xbfffffff */
138 #define SABRE_PCITASR_89 0x0000000000000010UL /* Respond to 0x80000000-0x9fffffff */
139 #define SABRE_PCITASR_67 0x0000000000000008UL /* Respond to 0x60000000-0x7fffffff */
140 #define SABRE_PCITASR_45 0x0000000000000004UL /* Respond to 0x40000000-0x5fffffff */
141 #define SABRE_PCITASR_23 0x0000000000000002UL /* Respond to 0x20000000-0x3fffffff */
142 #define SABRE_PCITASR_01 0x0000000000000001UL /* Respond to 0x00000000-0x1fffffff */
143 #define SABRE_PIOBUF_DIAG 0x5000UL
144 #define SABRE_DMABUF_DIAGLO 0x5100UL
145 #define SABRE_DMABUF_DIAGHI 0x51c0UL
146 #define SABRE_IMAP_GFX_ALIAS 0x6000UL /* Aliases to 0x1098 */
147 #define SABRE_IMAP_EUPA_ALIAS 0x8000UL /* Aliases to 0x10a0 */
148 #define SABRE_IOMMU_VADIAG 0xa400UL
149 #define SABRE_IOMMU_TCDIAG 0xa408UL
150 #define SABRE_IOMMU_TAG 0xa580UL
151 #define SABRE_IOMMUTAG_ERRSTS 0x0000000001800000UL /* Error status bits */
152 #define SABRE_IOMMUTAG_ERR 0x0000000000400000UL /* Error present */
153 #define SABRE_IOMMUTAG_WRITE 0x0000000000200000UL /* Page is writable */
154 #define SABRE_IOMMUTAG_STREAM 0x0000000000100000UL /* Streamable bit - unused */
155 #define SABRE_IOMMUTAG_SIZE 0x0000000000080000UL /* 0=8k 1=16k */
156 #define SABRE_IOMMUTAG_VPN 0x000000000007ffffUL /* Virtual Page Number [31:13] */
157 #define SABRE_IOMMU_DATA 0xa600UL
158 #define SABRE_IOMMUDATA_VALID 0x0000000040000000UL /* Valid */
159 #define SABRE_IOMMUDATA_USED 0x0000000020000000UL /* Used (for LRU algorithm) */
160 #define SABRE_IOMMUDATA_CACHE 0x0000000010000000UL /* Cacheable */
161 #define SABRE_IOMMUDATA_PPN 0x00000000001fffffUL /* Physical Page Number [33:13] */
162 #define SABRE_PCI_IRQSTATE 0xa800UL
163 #define SABRE_OBIO_IRQSTATE 0xa808UL
164 #define SABRE_FFBCFG 0xf000UL
165 #define SABRE_FFBCFG_SPRQS 0x000000000f000000 /* Slave P_RQST queue size */
166 #define SABRE_FFBCFG_ONEREAD 0x0000000000004000 /* Slave supports one outstanding read */
167 #define SABRE_MCCTRL0 0xf010UL
168 #define SABRE_MCCTRL0_RENAB 0x0000000080000000 /* Refresh Enable */
169 #define SABRE_MCCTRL0_EENAB 0x0000000010000000 /* Enable all ECC functions */
170 #define SABRE_MCCTRL0_11BIT 0x0000000000001000 /* Enable 11-bit column addressing */
171 #define SABRE_MCCTRL0_DPP 0x0000000000000f00 /* DIMM Pair Present Bits */
172 #define SABRE_MCCTRL0_RINTVL 0x00000000000000ff /* Refresh Interval */
173 #define SABRE_MCCTRL1 0xf018UL
174 #define SABRE_MCCTRL1_AMDC 0x0000000038000000 /* Advance Memdata Clock */
175 #define SABRE_MCCTRL1_ARDC 0x0000000007000000 /* Advance DRAM Read Data Clock */
176 #define SABRE_MCCTRL1_CSR 0x0000000000e00000 /* CAS to RAS delay for CBR refresh */
177 #define SABRE_MCCTRL1_CASRW 0x00000000001c0000 /* CAS length for read/write */
178 #define SABRE_MCCTRL1_RCD 0x0000000000038000 /* RAS to CAS delay */
179 #define SABRE_MCCTRL1_CP 0x0000000000007000 /* CAS Precharge */
180 #define SABRE_MCCTRL1_RP 0x0000000000000e00 /* RAS Precharge */
181 #define SABRE_MCCTRL1_RAS 0x00000000000001c0 /* Length of RAS for refresh */
182 #define SABRE_MCCTRL1_CASRW2 0x0000000000000038 /* Must be same as CASRW */
183 #define SABRE_MCCTRL1_RSC 0x0000000000000007 /* RAS after CAS hold time */
184 #define SABRE_RESETCTRL 0xf020UL
185
186 #define SABRE_CONFIGSPACE 0x001000000UL
187 #define SABRE_IOSPACE 0x002000000UL
188 #define SABRE_IOSPACE_SIZE 0x000ffffffUL
189 #define SABRE_MEMSPACE 0x100000000UL
190 #define SABRE_MEMSPACE_SIZE 0x07fffffffUL
191
192 static int hummingbird_p;
193 static struct pci_bus *sabre_root_bus;
194
195 static irqreturn_t sabre_ue_intr(int irq, void *dev_id)
196 {
197 struct pci_pbm_info *pbm = dev_id;
198 unsigned long afsr_reg = pbm->controller_regs + SABRE_UE_AFSR;
199 unsigned long afar_reg = pbm->controller_regs + SABRE_UECE_AFAR;
200 unsigned long afsr, afar, error_bits;
201 int reported;
202
203 /* Latch uncorrectable error status. */
204 afar = upa_readq(afar_reg);
205 afsr = upa_readq(afsr_reg);
206
207 /* Clear the primary/secondary error status bits. */
208 error_bits = afsr &
209 (SABRE_UEAFSR_PDRD | SABRE_UEAFSR_PDWR |
210 SABRE_UEAFSR_SDRD | SABRE_UEAFSR_SDWR |
211 SABRE_UEAFSR_SDTE | SABRE_UEAFSR_PDTE);
212 if (!error_bits)
213 return IRQ_NONE;
214 upa_writeq(error_bits, afsr_reg);
215
216 /* Log the error. */
217 printk("%s: Uncorrectable Error, primary error type[%s%s]\n",
218 pbm->name,
219 ((error_bits & SABRE_UEAFSR_PDRD) ?
220 "DMA Read" :
221 ((error_bits & SABRE_UEAFSR_PDWR) ?
222 "DMA Write" : "???")),
223 ((error_bits & SABRE_UEAFSR_PDTE) ?
224 ":Translation Error" : ""));
225 printk("%s: bytemask[%04lx] dword_offset[%lx] was_block(%d)\n",
226 pbm->name,
227 (afsr & SABRE_UEAFSR_BMSK) >> 32UL,
228 (afsr & SABRE_UEAFSR_OFF) >> 29UL,
229 ((afsr & SABRE_UEAFSR_BLK) ? 1 : 0));
230 printk("%s: UE AFAR [%016lx]\n", pbm->name, afar);
231 printk("%s: UE Secondary errors [", pbm->name);
232 reported = 0;
233 if (afsr & SABRE_UEAFSR_SDRD) {
234 reported++;
235 printk("(DMA Read)");
236 }
237 if (afsr & SABRE_UEAFSR_SDWR) {
238 reported++;
239 printk("(DMA Write)");
240 }
241 if (afsr & SABRE_UEAFSR_SDTE) {
242 reported++;
243 printk("(Translation Error)");
244 }
245 if (!reported)
246 printk("(none)");
247 printk("]\n");
248
249 /* Interrogate IOMMU for error status. */
250 psycho_check_iommu_error(pbm, afsr, afar, UE_ERR);
251
252 return IRQ_HANDLED;
253 }
254
255 static irqreturn_t sabre_ce_intr(int irq, void *dev_id)
256 {
257 struct pci_pbm_info *pbm = dev_id;
258 unsigned long afsr_reg = pbm->controller_regs + SABRE_CE_AFSR;
259 unsigned long afar_reg = pbm->controller_regs + SABRE_UECE_AFAR;
260 unsigned long afsr, afar, error_bits;
261 int reported;
262
263 /* Latch error status. */
264 afar = upa_readq(afar_reg);
265 afsr = upa_readq(afsr_reg);
266
267 /* Clear primary/secondary error status bits. */
268 error_bits = afsr &
269 (SABRE_CEAFSR_PDRD | SABRE_CEAFSR_PDWR |
270 SABRE_CEAFSR_SDRD | SABRE_CEAFSR_SDWR);
271 if (!error_bits)
272 return IRQ_NONE;
273 upa_writeq(error_bits, afsr_reg);
274
275 /* Log the error. */
276 printk("%s: Correctable Error, primary error type[%s]\n",
277 pbm->name,
278 ((error_bits & SABRE_CEAFSR_PDRD) ?
279 "DMA Read" :
280 ((error_bits & SABRE_CEAFSR_PDWR) ?
281 "DMA Write" : "???")));
282
283 /* XXX Use syndrome and afar to print out module string just like
284 * XXX UDB CE trap handler does... -DaveM
285 */
286 printk("%s: syndrome[%02lx] bytemask[%04lx] dword_offset[%lx] "
287 "was_block(%d)\n",
288 pbm->name,
289 (afsr & SABRE_CEAFSR_ESYND) >> 48UL,
290 (afsr & SABRE_CEAFSR_BMSK) >> 32UL,
291 (afsr & SABRE_CEAFSR_OFF) >> 29UL,
292 ((afsr & SABRE_CEAFSR_BLK) ? 1 : 0));
293 printk("%s: CE AFAR [%016lx]\n", pbm->name, afar);
294 printk("%s: CE Secondary errors [", pbm->name);
295 reported = 0;
296 if (afsr & SABRE_CEAFSR_SDRD) {
297 reported++;
298 printk("(DMA Read)");
299 }
300 if (afsr & SABRE_CEAFSR_SDWR) {
301 reported++;
302 printk("(DMA Write)");
303 }
304 if (!reported)
305 printk("(none)");
306 printk("]\n");
307
308 return IRQ_HANDLED;
309 }
310
311 static void sabre_register_error_handlers(struct pci_pbm_info *pbm)
312 {
313 struct device_node *dp = pbm->op->dev.of_node;
314 struct platform_device *op;
315 unsigned long base = pbm->controller_regs;
316 u64 tmp;
317 int err;
318
319 if (pbm->chip_type == PBM_CHIP_TYPE_SABRE)
320 dp = dp->parent;
321
322 op = of_find_device_by_node(dp);
323 if (!op)
324 return;
325
326 /* Sabre/Hummingbird IRQ property layout is:
327 * 0: PCI ERR
328 * 1: UE ERR
329 * 2: CE ERR
330 * 3: POWER FAIL
331 */
332 if (op->archdata.num_irqs < 4)
333 return;
334
335 /* We clear the error bits in the appropriate AFSR before
336 * registering the handler so that we don't get spurious
337 * interrupts.
338 */
339 upa_writeq((SABRE_UEAFSR_PDRD | SABRE_UEAFSR_PDWR |
340 SABRE_UEAFSR_SDRD | SABRE_UEAFSR_SDWR |
341 SABRE_UEAFSR_SDTE | SABRE_UEAFSR_PDTE),
342 base + SABRE_UE_AFSR);
343
344 err = request_irq(op->archdata.irqs[1], sabre_ue_intr, 0, "SABRE_UE", pbm);
345 if (err)
346 printk(KERN_WARNING "%s: Couldn't register UE, err=%d.\n",
347 pbm->name, err);
348
349 upa_writeq((SABRE_CEAFSR_PDRD | SABRE_CEAFSR_PDWR |
350 SABRE_CEAFSR_SDRD | SABRE_CEAFSR_SDWR),
351 base + SABRE_CE_AFSR);
352
353
354 err = request_irq(op->archdata.irqs[2], sabre_ce_intr, 0, "SABRE_CE", pbm);
355 if (err)
356 printk(KERN_WARNING "%s: Couldn't register CE, err=%d.\n",
357 pbm->name, err);
358 err = request_irq(op->archdata.irqs[0], psycho_pcierr_intr, 0,
359 "SABRE_PCIERR", pbm);
360 if (err)
361 printk(KERN_WARNING "%s: Couldn't register PCIERR, err=%d.\n",
362 pbm->name, err);
363
364 tmp = upa_readq(base + SABRE_PCICTRL);
365 tmp |= SABRE_PCICTRL_ERREN;
366 upa_writeq(tmp, base + SABRE_PCICTRL);
367 }
368
369 static void apb_init(struct pci_bus *sabre_bus)
370 {
371 struct pci_dev *pdev;
372
373 list_for_each_entry(pdev, &sabre_bus->devices, bus_list) {
374 if (pdev->vendor == PCI_VENDOR_ID_SUN &&
375 pdev->device == PCI_DEVICE_ID_SUN_SIMBA) {
376 u16 word16;
377
378 pci_read_config_word(pdev, PCI_COMMAND, &word16);
379 word16 |= PCI_COMMAND_SERR | PCI_COMMAND_PARITY |
380 PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY |
381 PCI_COMMAND_IO;
382 pci_write_config_word(pdev, PCI_COMMAND, word16);
383
384 /* Status register bits are "write 1 to clear". */
385 pci_write_config_word(pdev, PCI_STATUS, 0xffff);
386 pci_write_config_word(pdev, PCI_SEC_STATUS, 0xffff);
387
388 /* Use a primary/seconday latency timer value
389 * of 64.
390 */
391 pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
392 pci_write_config_byte(pdev, PCI_SEC_LATENCY_TIMER, 64);
393
394 /* Enable reporting/forwarding of master aborts,
395 * parity, and SERR.
396 */
397 pci_write_config_byte(pdev, PCI_BRIDGE_CONTROL,
398 (PCI_BRIDGE_CTL_PARITY |
399 PCI_BRIDGE_CTL_SERR |
400 PCI_BRIDGE_CTL_MASTER_ABORT));
401 }
402 }
403 }
404
405 static void __devinit sabre_scan_bus(struct pci_pbm_info *pbm,
406 struct device *parent)
407 {
408 static int once;
409
410 /* The APB bridge speaks to the Sabre host PCI bridge
411 * at 66Mhz, but the front side of APB runs at 33Mhz
412 * for both segments.
413 *
414 * Hummingbird systems do not use APB, so they run
415 * at 66MHZ.
416 */
417 if (hummingbird_p)
418 pbm->is_66mhz_capable = 1;
419 else
420 pbm->is_66mhz_capable = 0;
421
422 /* This driver has not been verified to handle
423 * multiple SABREs yet, so trap this.
424 *
425 * Also note that the SABRE host bridge is hardwired
426 * to live at bus 0.
427 */
428 if (once != 0) {
429 printk(KERN_ERR PFX "Multiple controllers unsupported.\n");
430 return;
431 }
432 once++;
433
434 pbm->pci_bus = pci_scan_one_pbm(pbm, parent);
435 if (!pbm->pci_bus)
436 return;
437
438 sabre_root_bus = pbm->pci_bus;
439
440 apb_init(pbm->pci_bus);
441
442 sabre_register_error_handlers(pbm);
443 }
444
445 static void __devinit sabre_pbm_init(struct pci_pbm_info *pbm,
446 struct platform_device *op)
447 {
448 psycho_pbm_init_common(pbm, op, "SABRE", PBM_CHIP_TYPE_SABRE);
449 pbm->pci_afsr = pbm->controller_regs + SABRE_PIOAFSR;
450 pbm->pci_afar = pbm->controller_regs + SABRE_PIOAFAR;
451 pbm->pci_csr = pbm->controller_regs + SABRE_PCICTRL;
452 sabre_scan_bus(pbm, &op->dev);
453 }
454
455 static int __devinit sabre_probe(struct platform_device *op,
456 const struct of_device_id *match)
457 {
458 const struct linux_prom64_registers *pr_regs;
459 struct device_node *dp = op->dev.of_node;
460 struct pci_pbm_info *pbm;
461 u32 upa_portid, dma_mask;
462 struct iommu *iommu;
463 int tsbsize, err;
464 const u32 *vdma;
465 u64 clear_irq;
466
467 hummingbird_p = (match->data != NULL);
468 if (!hummingbird_p) {
469 struct device_node *cpu_dp;
470
471 /* Of course, Sun has to encode things a thousand
472 * different ways, inconsistently.
473 */
474 for_each_node_by_type(cpu_dp, "cpu") {
475 if (!strcmp(cpu_dp->name, "SUNW,UltraSPARC-IIe"))
476 hummingbird_p = 1;
477 }
478 }
479
480 err = -ENOMEM;
481 pbm = kzalloc(sizeof(*pbm), GFP_KERNEL);
482 if (!pbm) {
483 printk(KERN_ERR PFX "Cannot allocate pci_pbm_info.\n");
484 goto out_err;
485 }
486
487 iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
488 if (!iommu) {
489 printk(KERN_ERR PFX "Cannot allocate PBM iommu.\n");
490 goto out_free_controller;
491 }
492
493 pbm->iommu = iommu;
494
495 upa_portid = of_getintprop_default(dp, "upa-portid", 0xff);
496
497 pbm->portid = upa_portid;
498
499 /*
500 * Map in SABRE register set and report the presence of this SABRE.
501 */
502
503 pr_regs = of_get_property(dp, "reg", NULL);
504 err = -ENODEV;
505 if (!pr_regs) {
506 printk(KERN_ERR PFX "No reg property\n");
507 goto out_free_iommu;
508 }
509
510 /*
511 * First REG in property is base of entire SABRE register space.
512 */
513 pbm->controller_regs = pr_regs[0].phys_addr;
514
515 /* Clear interrupts */
516
517 /* PCI first */
518 for (clear_irq = SABRE_ICLR_A_SLOT0; clear_irq < SABRE_ICLR_B_SLOT0 + 0x80; clear_irq += 8)
519 upa_writeq(0x0UL, pbm->controller_regs + clear_irq);
520
521 /* Then OBIO */
522 for (clear_irq = SABRE_ICLR_SCSI; clear_irq < SABRE_ICLR_SCSI + 0x80; clear_irq += 8)
523 upa_writeq(0x0UL, pbm->controller_regs + clear_irq);
524
525 /* Error interrupts are enabled later after the bus scan. */
526 upa_writeq((SABRE_PCICTRL_MRLEN | SABRE_PCICTRL_SERR |
527 SABRE_PCICTRL_ARBPARK | SABRE_PCICTRL_AEN),
528 pbm->controller_regs + SABRE_PCICTRL);
529
530 /* Now map in PCI config space for entire SABRE. */
531 pbm->config_space = pbm->controller_regs + SABRE_CONFIGSPACE;
532
533 vdma = of_get_property(dp, "virtual-dma", NULL);
534 if (!vdma) {
535 printk(KERN_ERR PFX "No virtual-dma property\n");
536 goto out_free_iommu;
537 }
538
539 dma_mask = vdma[0];
540 switch(vdma[1]) {
541 case 0x20000000:
542 dma_mask |= 0x1fffffff;
543 tsbsize = 64;
544 break;
545 case 0x40000000:
546 dma_mask |= 0x3fffffff;
547 tsbsize = 128;
548 break;
549
550 case 0x80000000:
551 dma_mask |= 0x7fffffff;
552 tsbsize = 128;
553 break;
554 default:
555 printk(KERN_ERR PFX "Strange virtual-dma size.\n");
556 goto out_free_iommu;
557 }
558
559 err = psycho_iommu_init(pbm, tsbsize, vdma[0], dma_mask, SABRE_WRSYNC);
560 if (err)
561 goto out_free_iommu;
562
563 /*
564 * Look for APB underneath.
565 */
566 sabre_pbm_init(pbm, op);
567
568 pbm->next = pci_pbm_root;
569 pci_pbm_root = pbm;
570
571 dev_set_drvdata(&op->dev, pbm);
572
573 return 0;
574
575 out_free_iommu:
576 kfree(pbm->iommu);
577
578 out_free_controller:
579 kfree(pbm);
580
581 out_err:
582 return err;
583 }
584
585 static struct of_device_id __initdata sabre_match[] = {
586 {
587 .name = "pci",
588 .compatible = "pci108e,a001",
589 .data = (void *) 1,
590 },
591 {
592 .name = "pci",
593 .compatible = "pci108e,a000",
594 },
595 {},
596 };
597
598 static struct of_platform_driver sabre_driver = {
599 .driver = {
600 .name = DRIVER_NAME,
601 .owner = THIS_MODULE,
602 .of_match_table = sabre_match,
603 },
604 .probe = sabre_probe,
605 };
606
607 static int __init sabre_init(void)
608 {
609 return of_register_platform_driver(&sabre_driver);
610 }
611
612 subsys_initcall(sabre_init);
WandBoard kernel