ssb: Add support for block-I/O
[linux-2.6.git] / drivers / ssb / pci.c
1 /*
2  * Sonics Silicon Backplane PCI-Hostbus related functions.
3  *
4  * Copyright (C) 2005-2006 Michael Buesch <mb@bu3sch.de>
5  * Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>
6  * Copyright (C) 2005 Stefano Brivio <st3@riseup.net>
7  * Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
8  * Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
9  *
10  * Derived from the Broadcom 4400 device driver.
11  * Copyright (C) 2002 David S. Miller (davem@redhat.com)
12  * Fixed by Pekka Pietikainen (pp@ee.oulu.fi)
13  * Copyright (C) 2006 Broadcom Corporation.
14  *
15  * Licensed under the GNU/GPL. See COPYING for details.
16  */
17
18 #include <linux/ssb/ssb.h>
19 #include <linux/ssb/ssb_regs.h>
20 #include <linux/pci.h>
21 #include <linux/delay.h>
22
23 #include "ssb_private.h"
24
25
26 /* Define the following to 1 to enable a printk on each coreswitch. */
27 #define SSB_VERBOSE_PCICORESWITCH_DEBUG         0
28
29
30 /* Lowlevel coreswitching */
31 int ssb_pci_switch_coreidx(struct ssb_bus *bus, u8 coreidx)
32 {
33         int err;
34         int attempts = 0;
35         u32 cur_core;
36
37         while (1) {
38                 err = pci_write_config_dword(bus->host_pci, SSB_BAR0_WIN,
39                                              (coreidx * SSB_CORE_SIZE)
40                                              + SSB_ENUM_BASE);
41                 if (err)
42                         goto error;
43                 err = pci_read_config_dword(bus->host_pci, SSB_BAR0_WIN,
44                                             &cur_core);
45                 if (err)
46                         goto error;
47                 cur_core = (cur_core - SSB_ENUM_BASE)
48                            / SSB_CORE_SIZE;
49                 if (cur_core == coreidx)
50                         break;
51
52                 if (attempts++ > SSB_BAR0_MAX_RETRIES)
53                         goto error;
54                 udelay(10);
55         }
56         return 0;
57 error:
58         ssb_printk(KERN_ERR PFX "Failed to switch to core %u\n", coreidx);
59         return -ENODEV;
60 }
61
62 int ssb_pci_switch_core(struct ssb_bus *bus,
63                         struct ssb_device *dev)
64 {
65         int err;
66         unsigned long flags;
67
68 #if SSB_VERBOSE_PCICORESWITCH_DEBUG
69         ssb_printk(KERN_INFO PFX
70                    "Switching to %s core, index %d\n",
71                    ssb_core_name(dev->id.coreid),
72                    dev->core_index);
73 #endif
74
75         spin_lock_irqsave(&bus->bar_lock, flags);
76         err = ssb_pci_switch_coreidx(bus, dev->core_index);
77         if (!err)
78                 bus->mapped_device = dev;
79         spin_unlock_irqrestore(&bus->bar_lock, flags);
80
81         return err;
82 }
83
84 /* Enable/disable the on board crystal oscillator and/or PLL. */
85 int ssb_pci_xtal(struct ssb_bus *bus, u32 what, int turn_on)
86 {
87         int err;
88         u32 in, out, outenable;
89         u16 pci_status;
90
91         if (bus->bustype != SSB_BUSTYPE_PCI)
92                 return 0;
93
94         err = pci_read_config_dword(bus->host_pci, SSB_GPIO_IN, &in);
95         if (err)
96                 goto err_pci;
97         err = pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT, &out);
98         if (err)
99                 goto err_pci;
100         err = pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT_ENABLE, &outenable);
101         if (err)
102                 goto err_pci;
103
104         outenable |= what;
105
106         if (turn_on) {
107                 /* Avoid glitching the clock if GPRS is already using it.
108                  * We can't actually read the state of the PLLPD so we infer it
109                  * by the value of XTAL_PU which *is* readable via gpioin.
110                  */
111                 if (!(in & SSB_GPIO_XTAL)) {
112                         if (what & SSB_GPIO_XTAL) {
113                                 /* Turn the crystal on */
114                                 out |= SSB_GPIO_XTAL;
115                                 if (what & SSB_GPIO_PLL)
116                                         out |= SSB_GPIO_PLL;
117                                 err = pci_write_config_dword(bus->host_pci, SSB_GPIO_OUT, out);
118                                 if (err)
119                                         goto err_pci;
120                                 err = pci_write_config_dword(bus->host_pci, SSB_GPIO_OUT_ENABLE,
121                                                              outenable);
122                                 if (err)
123                                         goto err_pci;
124                                 msleep(1);
125                         }
126                         if (what & SSB_GPIO_PLL) {
127                                 /* Turn the PLL on */
128                                 out &= ~SSB_GPIO_PLL;
129                                 err = pci_write_config_dword(bus->host_pci, SSB_GPIO_OUT, out);
130                                 if (err)
131                                         goto err_pci;
132                                 msleep(5);
133                         }
134                 }
135
136                 err = pci_read_config_word(bus->host_pci, PCI_STATUS, &pci_status);
137                 if (err)
138                         goto err_pci;
139                 pci_status &= ~PCI_STATUS_SIG_TARGET_ABORT;
140                 err = pci_write_config_word(bus->host_pci, PCI_STATUS, pci_status);
141                 if (err)
142                         goto err_pci;
143         } else {
144                 if (what & SSB_GPIO_XTAL) {
145                         /* Turn the crystal off */
146                         out &= ~SSB_GPIO_XTAL;
147                 }
148                 if (what & SSB_GPIO_PLL) {
149                         /* Turn the PLL off */
150                         out |= SSB_GPIO_PLL;
151                 }
152                 err = pci_write_config_dword(bus->host_pci, SSB_GPIO_OUT, out);
153                 if (err)
154                         goto err_pci;
155                 err = pci_write_config_dword(bus->host_pci, SSB_GPIO_OUT_ENABLE, outenable);
156                 if (err)
157                         goto err_pci;
158         }
159
160 out:
161         return err;
162
163 err_pci:
164         printk(KERN_ERR PFX "Error: ssb_pci_xtal() could not access PCI config space!\n");
165         err = -EBUSY;
166         goto out;
167 }
168
169 /* Get the word-offset for a SSB_SPROM_XXX define. */
170 #define SPOFF(offset)   (((offset) - SSB_SPROM_BASE) / sizeof(u16))
171 /* Helper to extract some _offset, which is one of the SSB_SPROM_XXX defines. */
172 #define SPEX(_outvar, _offset, _mask, _shift)   \
173         out->_outvar = ((in[SPOFF(_offset)] & (_mask)) >> (_shift))
174
175 static inline u8 ssb_crc8(u8 crc, u8 data)
176 {
177         /* Polynomial:   x^8 + x^7 + x^6 + x^4 + x^2 + 1   */
178         static const u8 t[] = {
179                 0x00, 0xF7, 0xB9, 0x4E, 0x25, 0xD2, 0x9C, 0x6B,
180                 0x4A, 0xBD, 0xF3, 0x04, 0x6F, 0x98, 0xD6, 0x21,
181                 0x94, 0x63, 0x2D, 0xDA, 0xB1, 0x46, 0x08, 0xFF,
182                 0xDE, 0x29, 0x67, 0x90, 0xFB, 0x0C, 0x42, 0xB5,
183                 0x7F, 0x88, 0xC6, 0x31, 0x5A, 0xAD, 0xE3, 0x14,
184                 0x35, 0xC2, 0x8C, 0x7B, 0x10, 0xE7, 0xA9, 0x5E,
185                 0xEB, 0x1C, 0x52, 0xA5, 0xCE, 0x39, 0x77, 0x80,
186                 0xA1, 0x56, 0x18, 0xEF, 0x84, 0x73, 0x3D, 0xCA,
187                 0xFE, 0x09, 0x47, 0xB0, 0xDB, 0x2C, 0x62, 0x95,
188                 0xB4, 0x43, 0x0D, 0xFA, 0x91, 0x66, 0x28, 0xDF,
189                 0x6A, 0x9D, 0xD3, 0x24, 0x4F, 0xB8, 0xF6, 0x01,
190                 0x20, 0xD7, 0x99, 0x6E, 0x05, 0xF2, 0xBC, 0x4B,
191                 0x81, 0x76, 0x38, 0xCF, 0xA4, 0x53, 0x1D, 0xEA,
192                 0xCB, 0x3C, 0x72, 0x85, 0xEE, 0x19, 0x57, 0xA0,
193                 0x15, 0xE2, 0xAC, 0x5B, 0x30, 0xC7, 0x89, 0x7E,
194                 0x5F, 0xA8, 0xE6, 0x11, 0x7A, 0x8D, 0xC3, 0x34,
195                 0xAB, 0x5C, 0x12, 0xE5, 0x8E, 0x79, 0x37, 0xC0,
196                 0xE1, 0x16, 0x58, 0xAF, 0xC4, 0x33, 0x7D, 0x8A,
197                 0x3F, 0xC8, 0x86, 0x71, 0x1A, 0xED, 0xA3, 0x54,
198                 0x75, 0x82, 0xCC, 0x3B, 0x50, 0xA7, 0xE9, 0x1E,
199                 0xD4, 0x23, 0x6D, 0x9A, 0xF1, 0x06, 0x48, 0xBF,
200                 0x9E, 0x69, 0x27, 0xD0, 0xBB, 0x4C, 0x02, 0xF5,
201                 0x40, 0xB7, 0xF9, 0x0E, 0x65, 0x92, 0xDC, 0x2B,
202                 0x0A, 0xFD, 0xB3, 0x44, 0x2F, 0xD8, 0x96, 0x61,
203                 0x55, 0xA2, 0xEC, 0x1B, 0x70, 0x87, 0xC9, 0x3E,
204                 0x1F, 0xE8, 0xA6, 0x51, 0x3A, 0xCD, 0x83, 0x74,
205                 0xC1, 0x36, 0x78, 0x8F, 0xE4, 0x13, 0x5D, 0xAA,
206                 0x8B, 0x7C, 0x32, 0xC5, 0xAE, 0x59, 0x17, 0xE0,
207                 0x2A, 0xDD, 0x93, 0x64, 0x0F, 0xF8, 0xB6, 0x41,
208                 0x60, 0x97, 0xD9, 0x2E, 0x45, 0xB2, 0xFC, 0x0B,
209                 0xBE, 0x49, 0x07, 0xF0, 0x9B, 0x6C, 0x22, 0xD5,
210                 0xF4, 0x03, 0x4D, 0xBA, 0xD1, 0x26, 0x68, 0x9F,
211         };
212         return t[crc ^ data];
213 }
214
215 static u8 ssb_sprom_crc(const u16 *sprom, u16 size)
216 {
217         int word;
218         u8 crc = 0xFF;
219
220         for (word = 0; word < size - 1; word++) {
221                 crc = ssb_crc8(crc, sprom[word] & 0x00FF);
222                 crc = ssb_crc8(crc, (sprom[word] & 0xFF00) >> 8);
223         }
224         crc = ssb_crc8(crc, sprom[size - 1] & 0x00FF);
225         crc ^= 0xFF;
226
227         return crc;
228 }
229
230 static int sprom_check_crc(const u16 *sprom, size_t size)
231 {
232         u8 crc;
233         u8 expected_crc;
234         u16 tmp;
235
236         crc = ssb_sprom_crc(sprom, size);
237         tmp = sprom[size - 1] & SSB_SPROM_REVISION_CRC;
238         expected_crc = tmp >> SSB_SPROM_REVISION_CRC_SHIFT;
239         if (crc != expected_crc)
240                 return -EPROTO;
241
242         return 0;
243 }
244
245 static int sprom_do_read(struct ssb_bus *bus, u16 *sprom)
246 {
247         int i;
248
249         for (i = 0; i < bus->sprom_size; i++)
250                 sprom[i] = ioread16(bus->mmio + SSB_SPROM_BASE + (i * 2));
251
252         return 0;
253 }
254
255 static int sprom_do_write(struct ssb_bus *bus, const u16 *sprom)
256 {
257         struct pci_dev *pdev = bus->host_pci;
258         int i, err;
259         u32 spromctl;
260         u16 size = bus->sprom_size;
261
262         ssb_printk(KERN_NOTICE PFX "Writing SPROM. Do NOT turn off the power! Please stand by...\n");
263         err = pci_read_config_dword(pdev, SSB_SPROMCTL, &spromctl);
264         if (err)
265                 goto err_ctlreg;
266         spromctl |= SSB_SPROMCTL_WE;
267         err = pci_write_config_dword(pdev, SSB_SPROMCTL, spromctl);
268         if (err)
269                 goto err_ctlreg;
270         ssb_printk(KERN_NOTICE PFX "[ 0%%");
271         msleep(500);
272         for (i = 0; i < size; i++) {
273                 if (i == size / 4)
274                         ssb_printk("25%%");
275                 else if (i == size / 2)
276                         ssb_printk("50%%");
277                 else if (i == (size * 3) / 4)
278                         ssb_printk("75%%");
279                 else if (i % 2)
280                         ssb_printk(".");
281                 writew(sprom[i], bus->mmio + SSB_SPROM_BASE + (i * 2));
282                 mmiowb();
283                 msleep(20);
284         }
285         err = pci_read_config_dword(pdev, SSB_SPROMCTL, &spromctl);
286         if (err)
287                 goto err_ctlreg;
288         spromctl &= ~SSB_SPROMCTL_WE;
289         err = pci_write_config_dword(pdev, SSB_SPROMCTL, spromctl);
290         if (err)
291                 goto err_ctlreg;
292         msleep(500);
293         ssb_printk("100%% ]\n");
294         ssb_printk(KERN_NOTICE PFX "SPROM written.\n");
295
296         return 0;
297 err_ctlreg:
298         ssb_printk(KERN_ERR PFX "Could not access SPROM control register.\n");
299         return err;
300 }
301
302 static s8 r123_extract_antgain(u8 sprom_revision, const u16 *in,
303                                u16 mask, u16 shift)
304 {
305         u16 v;
306         u8 gain;
307
308         v = in[SPOFF(SSB_SPROM1_AGAIN)];
309         gain = (v & mask) >> shift;
310         if (gain == 0xFF)
311                 gain = 2; /* If unset use 2dBm */
312         if (sprom_revision == 1) {
313                 /* Convert to Q5.2 */
314                 gain <<= 2;
315         } else {
316                 /* Q5.2 Fractional part is stored in 0xC0 */
317                 gain = ((gain & 0xC0) >> 6) | ((gain & 0x3F) << 2);
318         }
319
320         return (s8)gain;
321 }
322
323 static void sprom_extract_r123(struct ssb_sprom *out, const u16 *in)
324 {
325         int i;
326         u16 v;
327         s8 gain;
328         u16 loc[3];
329
330         if (out->revision == 3) {                       /* rev 3 moved MAC */
331                 loc[0] = SSB_SPROM3_IL0MAC;
332                 loc[1] = SSB_SPROM3_ET0MAC;
333                 loc[2] = SSB_SPROM3_ET1MAC;
334         } else {
335                 loc[0] = SSB_SPROM1_IL0MAC;
336                 loc[1] = SSB_SPROM1_ET0MAC;
337                 loc[2] = SSB_SPROM1_ET1MAC;
338         }
339         for (i = 0; i < 3; i++) {
340                 v = in[SPOFF(loc[0]) + i];
341                 *(((__be16 *)out->il0mac) + i) = cpu_to_be16(v);
342         }
343         for (i = 0; i < 3; i++) {
344                 v = in[SPOFF(loc[1]) + i];
345                 *(((__be16 *)out->et0mac) + i) = cpu_to_be16(v);
346         }
347         for (i = 0; i < 3; i++) {
348                 v = in[SPOFF(loc[2]) + i];
349                 *(((__be16 *)out->et1mac) + i) = cpu_to_be16(v);
350         }
351         SPEX(et0phyaddr, SSB_SPROM1_ETHPHY, SSB_SPROM1_ETHPHY_ET0A, 0);
352         SPEX(et1phyaddr, SSB_SPROM1_ETHPHY, SSB_SPROM1_ETHPHY_ET1A,
353              SSB_SPROM1_ETHPHY_ET1A_SHIFT);
354         SPEX(et0mdcport, SSB_SPROM1_ETHPHY, SSB_SPROM1_ETHPHY_ET0M, 14);
355         SPEX(et1mdcport, SSB_SPROM1_ETHPHY, SSB_SPROM1_ETHPHY_ET1M, 15);
356         SPEX(board_rev, SSB_SPROM1_BINF, SSB_SPROM1_BINF_BREV, 0);
357         SPEX(country_code, SSB_SPROM1_BINF, SSB_SPROM1_BINF_CCODE,
358              SSB_SPROM1_BINF_CCODE_SHIFT);
359         SPEX(ant_available_a, SSB_SPROM1_BINF, SSB_SPROM1_BINF_ANTA,
360              SSB_SPROM1_BINF_ANTA_SHIFT);
361         SPEX(ant_available_bg, SSB_SPROM1_BINF, SSB_SPROM1_BINF_ANTBG,
362              SSB_SPROM1_BINF_ANTBG_SHIFT);
363         SPEX(pa0b0, SSB_SPROM1_PA0B0, 0xFFFF, 0);
364         SPEX(pa0b1, SSB_SPROM1_PA0B1, 0xFFFF, 0);
365         SPEX(pa0b2, SSB_SPROM1_PA0B2, 0xFFFF, 0);
366         SPEX(pa1b0, SSB_SPROM1_PA1B0, 0xFFFF, 0);
367         SPEX(pa1b1, SSB_SPROM1_PA1B1, 0xFFFF, 0);
368         SPEX(pa1b2, SSB_SPROM1_PA1B2, 0xFFFF, 0);
369         SPEX(gpio0, SSB_SPROM1_GPIOA, SSB_SPROM1_GPIOA_P0, 0);
370         SPEX(gpio1, SSB_SPROM1_GPIOA, SSB_SPROM1_GPIOA_P1,
371              SSB_SPROM1_GPIOA_P1_SHIFT);
372         SPEX(gpio2, SSB_SPROM1_GPIOB, SSB_SPROM1_GPIOB_P2, 0);
373         SPEX(gpio3, SSB_SPROM1_GPIOB, SSB_SPROM1_GPIOB_P3,
374              SSB_SPROM1_GPIOB_P3_SHIFT);
375         SPEX(maxpwr_a, SSB_SPROM1_MAXPWR, SSB_SPROM1_MAXPWR_A,
376              SSB_SPROM1_MAXPWR_A_SHIFT);
377         SPEX(maxpwr_bg, SSB_SPROM1_MAXPWR, SSB_SPROM1_MAXPWR_BG, 0);
378         SPEX(itssi_a, SSB_SPROM1_ITSSI, SSB_SPROM1_ITSSI_A,
379              SSB_SPROM1_ITSSI_A_SHIFT);
380         SPEX(itssi_bg, SSB_SPROM1_ITSSI, SSB_SPROM1_ITSSI_BG, 0);
381         SPEX(boardflags_lo, SSB_SPROM1_BFLLO, 0xFFFF, 0);
382         if (out->revision >= 2)
383                 SPEX(boardflags_hi, SSB_SPROM2_BFLHI, 0xFFFF, 0);
384
385         /* Extract the antenna gain values. */
386         gain = r123_extract_antgain(out->revision, in,
387                                     SSB_SPROM1_AGAIN_BG,
388                                     SSB_SPROM1_AGAIN_BG_SHIFT);
389         out->antenna_gain.ghz24.a0 = gain;
390         out->antenna_gain.ghz24.a1 = gain;
391         out->antenna_gain.ghz24.a2 = gain;
392         out->antenna_gain.ghz24.a3 = gain;
393         gain = r123_extract_antgain(out->revision, in,
394                                     SSB_SPROM1_AGAIN_A,
395                                     SSB_SPROM1_AGAIN_A_SHIFT);
396         out->antenna_gain.ghz5.a0 = gain;
397         out->antenna_gain.ghz5.a1 = gain;
398         out->antenna_gain.ghz5.a2 = gain;
399         out->antenna_gain.ghz5.a3 = gain;
400 }
401
402 static void sprom_extract_r4(struct ssb_sprom *out, const u16 *in)
403 {
404         int i;
405         u16 v;
406
407         /* extract the equivalent of the r1 variables */
408         for (i = 0; i < 3; i++) {
409                 v = in[SPOFF(SSB_SPROM4_IL0MAC) + i];
410                 *(((__be16 *)out->il0mac) + i) = cpu_to_be16(v);
411         }
412         for (i = 0; i < 3; i++) {
413                 v = in[SPOFF(SSB_SPROM4_ET0MAC) + i];
414                 *(((__be16 *)out->et0mac) + i) = cpu_to_be16(v);
415         }
416         for (i = 0; i < 3; i++) {
417                 v = in[SPOFF(SSB_SPROM4_ET1MAC) + i];
418                 *(((__be16 *)out->et1mac) + i) = cpu_to_be16(v);
419         }
420         SPEX(et0phyaddr, SSB_SPROM4_ETHPHY, SSB_SPROM4_ETHPHY_ET0A, 0);
421         SPEX(et1phyaddr, SSB_SPROM4_ETHPHY, SSB_SPROM4_ETHPHY_ET1A,
422              SSB_SPROM4_ETHPHY_ET1A_SHIFT);
423         SPEX(country_code, SSB_SPROM4_CCODE, 0xFFFF, 0);
424         SPEX(boardflags_lo, SSB_SPROM4_BFLLO, 0xFFFF, 0);
425         SPEX(boardflags_hi, SSB_SPROM4_BFLHI, 0xFFFF, 0);
426         SPEX(ant_available_a, SSB_SPROM4_ANTAVAIL, SSB_SPROM4_ANTAVAIL_A,
427              SSB_SPROM4_ANTAVAIL_A_SHIFT);
428         SPEX(ant_available_bg, SSB_SPROM4_ANTAVAIL, SSB_SPROM4_ANTAVAIL_BG,
429              SSB_SPROM4_ANTAVAIL_BG_SHIFT);
430         SPEX(maxpwr_bg, SSB_SPROM4_MAXP_BG, SSB_SPROM4_MAXP_BG_MASK, 0);
431         SPEX(itssi_bg, SSB_SPROM4_MAXP_BG, SSB_SPROM4_ITSSI_BG,
432              SSB_SPROM4_ITSSI_BG_SHIFT);
433         SPEX(maxpwr_a, SSB_SPROM4_MAXP_A, SSB_SPROM4_MAXP_A_MASK, 0);
434         SPEX(itssi_a, SSB_SPROM4_MAXP_A, SSB_SPROM4_ITSSI_A,
435              SSB_SPROM4_ITSSI_A_SHIFT);
436         SPEX(gpio0, SSB_SPROM4_GPIOA, SSB_SPROM4_GPIOA_P0, 0);
437         SPEX(gpio1, SSB_SPROM4_GPIOA, SSB_SPROM4_GPIOA_P1,
438              SSB_SPROM4_GPIOA_P1_SHIFT);
439         SPEX(gpio2, SSB_SPROM4_GPIOB, SSB_SPROM4_GPIOB_P2, 0);
440         SPEX(gpio3, SSB_SPROM4_GPIOB, SSB_SPROM4_GPIOB_P3,
441              SSB_SPROM4_GPIOB_P3_SHIFT);
442
443         /* Extract the antenna gain values. */
444         SPEX(antenna_gain.ghz24.a0, SSB_SPROM4_AGAIN01,
445              SSB_SPROM4_AGAIN0, SSB_SPROM4_AGAIN0_SHIFT);
446         SPEX(antenna_gain.ghz24.a1, SSB_SPROM4_AGAIN01,
447              SSB_SPROM4_AGAIN1, SSB_SPROM4_AGAIN1_SHIFT);
448         SPEX(antenna_gain.ghz24.a2, SSB_SPROM4_AGAIN23,
449              SSB_SPROM4_AGAIN2, SSB_SPROM4_AGAIN2_SHIFT);
450         SPEX(antenna_gain.ghz24.a3, SSB_SPROM4_AGAIN23,
451              SSB_SPROM4_AGAIN3, SSB_SPROM4_AGAIN3_SHIFT);
452         memcpy(&out->antenna_gain.ghz5, &out->antenna_gain.ghz24,
453                sizeof(out->antenna_gain.ghz5));
454
455         /* TODO - get remaining rev 4 stuff needed */
456 }
457
458 static int sprom_extract(struct ssb_bus *bus, struct ssb_sprom *out,
459                          const u16 *in, u16 size)
460 {
461         memset(out, 0, sizeof(*out));
462
463         out->revision = in[size - 1] & 0x00FF;
464         ssb_dprintk(KERN_DEBUG PFX "SPROM revision %d detected.\n", out->revision);
465         if ((bus->chip_id & 0xFF00) == 0x4400) {
466                 /* Workaround: The BCM44XX chip has a stupid revision
467                  * number stored in the SPROM.
468                  * Always extract r1. */
469                 out->revision = 1;
470                 sprom_extract_r123(out, in);
471         } else if (bus->chip_id == 0x4321) {
472                 /* the BCM4328 has a chipid == 0x4321 and a rev 4 SPROM */
473                 out->revision = 4;
474                 sprom_extract_r4(out, in);
475         } else {
476                 if (out->revision == 0)
477                         goto unsupported;
478                 if (out->revision >= 1 && out->revision <= 3) {
479                         sprom_extract_r123(out, in);
480                 }
481                 if (out->revision == 4)
482                         sprom_extract_r4(out, in);
483                 if (out->revision >= 5)
484                         goto unsupported;
485         }
486
487         return 0;
488 unsupported:
489         ssb_printk(KERN_WARNING PFX "Unsupported SPROM revision %d "
490                    "detected. Will extract v1\n", out->revision);
491         sprom_extract_r123(out, in);
492         return 0;
493 }
494
495 static int ssb_pci_sprom_get(struct ssb_bus *bus,
496                              struct ssb_sprom *sprom)
497 {
498         int err = -ENOMEM;
499         u16 *buf;
500
501         buf = kcalloc(SSB_SPROMSIZE_WORDS_R123, sizeof(u16), GFP_KERNEL);
502         if (!buf)
503                 goto out;
504         bus->sprom_size = SSB_SPROMSIZE_WORDS_R123;
505         sprom_do_read(bus, buf);
506         err = sprom_check_crc(buf, bus->sprom_size);
507         if (err) {
508                 /* check for rev 4 sprom - has special signature */
509                 if (buf[32] == 0x5372) {
510                         kfree(buf);
511                         buf = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16),
512                                       GFP_KERNEL);
513                         if (!buf)
514                                 goto out;
515                         bus->sprom_size = SSB_SPROMSIZE_WORDS_R4;
516                         sprom_do_read(bus, buf);
517                         err = sprom_check_crc(buf, bus->sprom_size);
518                 }
519                 if (err)
520                         ssb_printk(KERN_WARNING PFX "WARNING: Invalid"
521                                    " SPROM CRC (corrupt SPROM)\n");
522         }
523         err = sprom_extract(bus, sprom, buf, bus->sprom_size);
524
525         kfree(buf);
526 out:
527         return err;
528 }
529
530 static void ssb_pci_get_boardinfo(struct ssb_bus *bus,
531                                   struct ssb_boardinfo *bi)
532 {
533         pci_read_config_word(bus->host_pci, PCI_SUBSYSTEM_VENDOR_ID,
534                              &bi->vendor);
535         pci_read_config_word(bus->host_pci, PCI_SUBSYSTEM_ID,
536                              &bi->type);
537         pci_read_config_word(bus->host_pci, PCI_REVISION_ID,
538                              &bi->rev);
539 }
540
541 int ssb_pci_get_invariants(struct ssb_bus *bus,
542                            struct ssb_init_invariants *iv)
543 {
544         int err;
545
546         err = ssb_pci_sprom_get(bus, &iv->sprom);
547         if (err)
548                 goto out;
549         ssb_pci_get_boardinfo(bus, &iv->boardinfo);
550
551 out:
552         return err;
553 }
554
555 #ifdef CONFIG_SSB_DEBUG
556 static int ssb_pci_assert_buspower(struct ssb_bus *bus)
557 {
558         if (likely(bus->powered_up))
559                 return 0;
560
561         printk(KERN_ERR PFX "FATAL ERROR: Bus powered down "
562                "while accessing PCI MMIO space\n");
563         if (bus->power_warn_count <= 10) {
564                 bus->power_warn_count++;
565                 dump_stack();
566         }
567
568         return -ENODEV;
569 }
570 #else /* DEBUG */
571 static inline int ssb_pci_assert_buspower(struct ssb_bus *bus)
572 {
573         return 0;
574 }
575 #endif /* DEBUG */
576
577 static u8 ssb_pci_read8(struct ssb_device *dev, u16 offset)
578 {
579         struct ssb_bus *bus = dev->bus;
580
581         if (unlikely(ssb_pci_assert_buspower(bus)))
582                 return 0xFF;
583         if (unlikely(bus->mapped_device != dev)) {
584                 if (unlikely(ssb_pci_switch_core(bus, dev)))
585                         return 0xFF;
586         }
587         return ioread8(bus->mmio + offset);
588 }
589
590 static u16 ssb_pci_read16(struct ssb_device *dev, u16 offset)
591 {
592         struct ssb_bus *bus = dev->bus;
593
594         if (unlikely(ssb_pci_assert_buspower(bus)))
595                 return 0xFFFF;
596         if (unlikely(bus->mapped_device != dev)) {
597                 if (unlikely(ssb_pci_switch_core(bus, dev)))
598                         return 0xFFFF;
599         }
600         return ioread16(bus->mmio + offset);
601 }
602
603 static u32 ssb_pci_read32(struct ssb_device *dev, u16 offset)
604 {
605         struct ssb_bus *bus = dev->bus;
606
607         if (unlikely(ssb_pci_assert_buspower(bus)))
608                 return 0xFFFFFFFF;
609         if (unlikely(bus->mapped_device != dev)) {
610                 if (unlikely(ssb_pci_switch_core(bus, dev)))
611                         return 0xFFFFFFFF;
612         }
613         return ioread32(bus->mmio + offset);
614 }
615
616 #ifdef CONFIG_SSB_BLOCKIO
617 static void ssb_pci_block_read(struct ssb_device *dev, void *buffer,
618                                size_t count, u16 offset, u8 reg_width)
619 {
620         struct ssb_bus *bus = dev->bus;
621         void __iomem *addr = bus->mmio + offset;
622
623         if (unlikely(ssb_pci_assert_buspower(bus)))
624                 goto error;
625         if (unlikely(bus->mapped_device != dev)) {
626                 if (unlikely(ssb_pci_switch_core(bus, dev)))
627                         goto error;
628         }
629         switch (reg_width) {
630         case sizeof(u8):
631                 ioread8_rep(addr, buffer, count);
632                 break;
633         case sizeof(u16):
634                 SSB_WARN_ON(count & 1);
635                 ioread16_rep(addr, buffer, count >> 1);
636                 break;
637         case sizeof(u32):
638                 SSB_WARN_ON(count & 3);
639                 ioread32_rep(addr, buffer, count >> 2);
640                 break;
641         default:
642                 SSB_WARN_ON(1);
643         }
644
645         return;
646 error:
647         memset(buffer, 0xFF, count);
648 }
649 #endif /* CONFIG_SSB_BLOCKIO */
650
651 static void ssb_pci_write8(struct ssb_device *dev, u16 offset, u8 value)
652 {
653         struct ssb_bus *bus = dev->bus;
654
655         if (unlikely(ssb_pci_assert_buspower(bus)))
656                 return;
657         if (unlikely(bus->mapped_device != dev)) {
658                 if (unlikely(ssb_pci_switch_core(bus, dev)))
659                         return;
660         }
661         iowrite8(value, bus->mmio + offset);
662 }
663
664 static void ssb_pci_write16(struct ssb_device *dev, u16 offset, u16 value)
665 {
666         struct ssb_bus *bus = dev->bus;
667
668         if (unlikely(ssb_pci_assert_buspower(bus)))
669                 return;
670         if (unlikely(bus->mapped_device != dev)) {
671                 if (unlikely(ssb_pci_switch_core(bus, dev)))
672                         return;
673         }
674         iowrite16(value, bus->mmio + offset);
675 }
676
677 static void ssb_pci_write32(struct ssb_device *dev, u16 offset, u32 value)
678 {
679         struct ssb_bus *bus = dev->bus;
680
681         if (unlikely(ssb_pci_assert_buspower(bus)))
682                 return;
683         if (unlikely(bus->mapped_device != dev)) {
684                 if (unlikely(ssb_pci_switch_core(bus, dev)))
685                         return;
686         }
687         iowrite32(value, bus->mmio + offset);
688 }
689
690 #ifdef CONFIG_SSB_BLOCKIO
691 static void ssb_pci_block_write(struct ssb_device *dev, const void *buffer,
692                                 size_t count, u16 offset, u8 reg_width)
693 {
694         struct ssb_bus *bus = dev->bus;
695         void __iomem *addr = bus->mmio + offset;
696
697         if (unlikely(ssb_pci_assert_buspower(bus)))
698                 return;
699         if (unlikely(bus->mapped_device != dev)) {
700                 if (unlikely(ssb_pci_switch_core(bus, dev)))
701                         return;
702         }
703         switch (reg_width) {
704         case sizeof(u8):
705                 iowrite8_rep(addr, buffer, count);
706                 break;
707         case sizeof(u16):
708                 SSB_WARN_ON(count & 1);
709                 iowrite16_rep(addr, buffer, count >> 1);
710                 break;
711         case sizeof(u32):
712                 SSB_WARN_ON(count & 3);
713                 iowrite32_rep(addr, buffer, count >> 2);
714                 break;
715         default:
716                 SSB_WARN_ON(1);
717         }
718 }
719 #endif /* CONFIG_SSB_BLOCKIO */
720
721 /* Not "static", as it's used in main.c */
722 const struct ssb_bus_ops ssb_pci_ops = {
723         .read8          = ssb_pci_read8,
724         .read16         = ssb_pci_read16,
725         .read32         = ssb_pci_read32,
726         .write8         = ssb_pci_write8,
727         .write16        = ssb_pci_write16,
728         .write32        = ssb_pci_write32,
729 #ifdef CONFIG_SSB_BLOCKIO
730         .block_read     = ssb_pci_block_read,
731         .block_write    = ssb_pci_block_write,
732 #endif
733 };
734
735 static ssize_t ssb_pci_attr_sprom_show(struct device *pcidev,
736                                        struct device_attribute *attr,
737                                        char *buf)
738 {
739         struct pci_dev *pdev = container_of(pcidev, struct pci_dev, dev);
740         struct ssb_bus *bus;
741
742         bus = ssb_pci_dev_to_bus(pdev);
743         if (!bus)
744                 return -ENODEV;
745
746         return ssb_attr_sprom_show(bus, buf, sprom_do_read);
747 }
748
749 static ssize_t ssb_pci_attr_sprom_store(struct device *pcidev,
750                                         struct device_attribute *attr,
751                                         const char *buf, size_t count)
752 {
753         struct pci_dev *pdev = container_of(pcidev, struct pci_dev, dev);
754         struct ssb_bus *bus;
755
756         bus = ssb_pci_dev_to_bus(pdev);
757         if (!bus)
758                 return -ENODEV;
759
760         return ssb_attr_sprom_store(bus, buf, count,
761                                     sprom_check_crc, sprom_do_write);
762 }
763
764 static DEVICE_ATTR(ssb_sprom, 0600,
765                    ssb_pci_attr_sprom_show,
766                    ssb_pci_attr_sprom_store);
767
768 void ssb_pci_exit(struct ssb_bus *bus)
769 {
770         struct pci_dev *pdev;
771
772         if (bus->bustype != SSB_BUSTYPE_PCI)
773                 return;
774
775         pdev = bus->host_pci;
776         device_remove_file(&pdev->dev, &dev_attr_ssb_sprom);
777 }
778
779 int ssb_pci_init(struct ssb_bus *bus)
780 {
781         struct pci_dev *pdev;
782         int err;
783
784         if (bus->bustype != SSB_BUSTYPE_PCI)
785                 return 0;
786
787         pdev = bus->host_pci;
788         mutex_init(&bus->sprom_mutex);
789         err = device_create_file(&pdev->dev, &dev_attr_ssb_sprom);
790         if (err)
791                 goto out;
792
793 out:
794         return err;
795 }