1 /*
2 * Sonics Silicon Backplane
3 * Broadcom MIPS core driver
4 *
5 * Copyright 2005, Broadcom Corporation
6 * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
7 *
8 * Licensed under the GNU/GPL. See COPYING for details.
9 */
10
11 #include "ssb_private.h"
12
13 #include <linux/ssb/ssb.h>
14
15 #include <linux/mtd/physmap.h>
16 #include <linux/serial.h>
17 #include <linux/serial_core.h>
18 #include <linux/serial_reg.h>
19 #include <linux/time.h>
20 #ifdef CONFIG_BCM47XX
21 #include <linux/bcm47xx_nvram.h>
22 #endif
23
24 static const char * const part_probes[] = { "bcm47xxpart", NULL };
25
26 static struct physmap_flash_data ssb_pflash_data = {
27 .part_probe_types = part_probes,
28 };
29
30 static struct resource ssb_pflash_resource = {
31 .name = "ssb_pflash",
32 .flags = IORESOURCE_MEM,
33 };
34
35 struct platform_device ssb_pflash_dev = {
36 .name = "physmap-flash",
37 .dev = {
38 .platform_data = &ssb_pflash_data,
39 },
40 .resource = &ssb_pflash_resource,
41 .num_resources = 1,
42 };
43
mips_read32(struct ssb_mipscore * mcore,u16 offset)44 static inline u32 mips_read32(struct ssb_mipscore *mcore,
45 u16 offset)
46 {
47 return ssb_read32(mcore->dev, offset);
48 }
49
mips_write32(struct ssb_mipscore * mcore,u16 offset,u32 value)50 static inline void mips_write32(struct ssb_mipscore *mcore,
51 u16 offset,
52 u32 value)
53 {
54 ssb_write32(mcore->dev, offset, value);
55 }
56
57 static const u32 ipsflag_irq_mask[] = {
58 0,
59 SSB_IPSFLAG_IRQ1,
60 SSB_IPSFLAG_IRQ2,
61 SSB_IPSFLAG_IRQ3,
62 SSB_IPSFLAG_IRQ4,
63 };
64
65 static const u32 ipsflag_irq_shift[] = {
66 0,
67 SSB_IPSFLAG_IRQ1_SHIFT,
68 SSB_IPSFLAG_IRQ2_SHIFT,
69 SSB_IPSFLAG_IRQ3_SHIFT,
70 SSB_IPSFLAG_IRQ4_SHIFT,
71 };
72
ssb_irqflag(struct ssb_device * dev)73 static inline u32 ssb_irqflag(struct ssb_device *dev)
74 {
75 u32 tpsflag = ssb_read32(dev, SSB_TPSFLAG);
76 if (tpsflag)
77 return ssb_read32(dev, SSB_TPSFLAG) & SSB_TPSFLAG_BPFLAG;
78 else
79 /* not irq supported */
80 return 0x3f;
81 }
82
find_device(struct ssb_device * rdev,int irqflag)83 static struct ssb_device *find_device(struct ssb_device *rdev, int irqflag)
84 {
85 struct ssb_bus *bus = rdev->bus;
86 int i;
87 for (i = 0; i < bus->nr_devices; i++) {
88 struct ssb_device *dev;
89 dev = &(bus->devices[i]);
90 if (ssb_irqflag(dev) == irqflag)
91 return dev;
92 }
93 return NULL;
94 }
95
96 /* Get the MIPS IRQ assignment for a specified device.
97 * If unassigned, 0 is returned.
98 * If disabled, 5 is returned.
99 * If not supported, 6 is returned.
100 */
ssb_mips_irq(struct ssb_device * dev)101 unsigned int ssb_mips_irq(struct ssb_device *dev)
102 {
103 struct ssb_bus *bus = dev->bus;
104 struct ssb_device *mdev = bus->mipscore.dev;
105 u32 irqflag;
106 u32 ipsflag;
107 u32 tmp;
108 unsigned int irq;
109
110 irqflag = ssb_irqflag(dev);
111 if (irqflag == 0x3f)
112 return 6;
113 ipsflag = ssb_read32(bus->mipscore.dev, SSB_IPSFLAG);
114 for (irq = 1; irq <= 4; irq++) {
115 tmp = ((ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq]);
116 if (tmp == irqflag)
117 break;
118 }
119 if (irq == 5) {
120 if ((1 << irqflag) & ssb_read32(mdev, SSB_INTVEC))
121 irq = 0;
122 }
123
124 return irq;
125 }
126
clear_irq(struct ssb_bus * bus,unsigned int irq)127 static void clear_irq(struct ssb_bus *bus, unsigned int irq)
128 {
129 struct ssb_device *dev = bus->mipscore.dev;
130
131 /* Clear the IRQ in the MIPScore backplane registers */
132 if (irq == 0) {
133 ssb_write32(dev, SSB_INTVEC, 0);
134 } else {
135 ssb_write32(dev, SSB_IPSFLAG,
136 ssb_read32(dev, SSB_IPSFLAG) |
137 ipsflag_irq_mask[irq]);
138 }
139 }
140
set_irq(struct ssb_device * dev,unsigned int irq)141 static void set_irq(struct ssb_device *dev, unsigned int irq)
142 {
143 unsigned int oldirq = ssb_mips_irq(dev);
144 struct ssb_bus *bus = dev->bus;
145 struct ssb_device *mdev = bus->mipscore.dev;
146 u32 irqflag = ssb_irqflag(dev);
147
148 BUG_ON(oldirq == 6);
149
150 dev->irq = irq + 2;
151
152 /* clear the old irq */
153 if (oldirq == 0)
154 ssb_write32(mdev, SSB_INTVEC, (~(1 << irqflag) & ssb_read32(mdev, SSB_INTVEC)));
155 else if (oldirq != 5)
156 clear_irq(bus, oldirq);
157
158 /* assign the new one */
159 if (irq == 0) {
160 ssb_write32(mdev, SSB_INTVEC, ((1 << irqflag) | ssb_read32(mdev, SSB_INTVEC)));
161 } else {
162 u32 ipsflag = ssb_read32(mdev, SSB_IPSFLAG);
163 if ((ipsflag & ipsflag_irq_mask[irq]) != ipsflag_irq_mask[irq]) {
164 u32 oldipsflag = (ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq];
165 struct ssb_device *olddev = find_device(dev, oldipsflag);
166 if (olddev)
167 set_irq(olddev, 0);
168 }
169 irqflag <<= ipsflag_irq_shift[irq];
170 irqflag |= (ipsflag & ~ipsflag_irq_mask[irq]);
171 ssb_write32(mdev, SSB_IPSFLAG, irqflag);
172 }
173 dev_dbg(dev->dev, "set_irq: core 0x%04x, irq %d => %d\n",
174 dev->id.coreid, oldirq+2, irq+2);
175 }
176
print_irq(struct ssb_device * dev,unsigned int irq)177 static void print_irq(struct ssb_device *dev, unsigned int irq)
178 {
179 static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
180 dev_dbg(dev->dev,
181 "core 0x%04x, irq : %s%s %s%s %s%s %s%s %s%s %s%s %s%s\n",
182 dev->id.coreid,
183 irq_name[0], irq == 0 ? "*" : " ",
184 irq_name[1], irq == 1 ? "*" : " ",
185 irq_name[2], irq == 2 ? "*" : " ",
186 irq_name[3], irq == 3 ? "*" : " ",
187 irq_name[4], irq == 4 ? "*" : " ",
188 irq_name[5], irq == 5 ? "*" : " ",
189 irq_name[6], irq == 6 ? "*" : " ");
190 }
191
dump_irq(struct ssb_bus * bus)192 static void dump_irq(struct ssb_bus *bus)
193 {
194 int i;
195 for (i = 0; i < bus->nr_devices; i++) {
196 struct ssb_device *dev;
197 dev = &(bus->devices[i]);
198 print_irq(dev, ssb_mips_irq(dev));
199 }
200 }
201
ssb_mips_serial_init(struct ssb_mipscore * mcore)202 static void ssb_mips_serial_init(struct ssb_mipscore *mcore)
203 {
204 struct ssb_bus *bus = mcore->dev->bus;
205
206 if (ssb_extif_available(&bus->extif))
207 mcore->nr_serial_ports = ssb_extif_serial_init(&bus->extif, mcore->serial_ports);
208 else if (ssb_chipco_available(&bus->chipco))
209 mcore->nr_serial_ports = ssb_chipco_serial_init(&bus->chipco, mcore->serial_ports);
210 else
211 mcore->nr_serial_ports = 0;
212 }
213
ssb_mips_flash_detect(struct ssb_mipscore * mcore)214 static void ssb_mips_flash_detect(struct ssb_mipscore *mcore)
215 {
216 struct ssb_bus *bus = mcore->dev->bus;
217 struct ssb_sflash *sflash = &mcore->sflash;
218 struct ssb_pflash *pflash = &mcore->pflash;
219
220 /* When there is no chipcommon on the bus there is 4MB flash */
221 if (!ssb_chipco_available(&bus->chipco)) {
222 pflash->present = true;
223 pflash->buswidth = 2;
224 pflash->window = SSB_FLASH1;
225 pflash->window_size = SSB_FLASH1_SZ;
226 goto ssb_pflash;
227 }
228
229 /* There is ChipCommon, so use it to read info about flash */
230 switch (bus->chipco.capabilities & SSB_CHIPCO_CAP_FLASHT) {
231 case SSB_CHIPCO_FLASHT_STSER:
232 case SSB_CHIPCO_FLASHT_ATSER:
233 dev_dbg(mcore->dev->dev, "Found serial flash\n");
234 ssb_sflash_init(&bus->chipco);
235 break;
236 case SSB_CHIPCO_FLASHT_PARA:
237 dev_dbg(mcore->dev->dev, "Found parallel flash\n");
238 pflash->present = true;
239 pflash->window = SSB_FLASH2;
240 pflash->window_size = SSB_FLASH2_SZ;
241 if ((ssb_read32(bus->chipco.dev, SSB_CHIPCO_FLASH_CFG)
242 & SSB_CHIPCO_CFG_DS16) == 0)
243 pflash->buswidth = 1;
244 else
245 pflash->buswidth = 2;
246 break;
247 }
248
249 ssb_pflash:
250 if (sflash->present) {
251 #ifdef CONFIG_BCM47XX
252 bcm47xx_nvram_init_from_mem(sflash->window, sflash->size);
253 #endif
254 } else if (pflash->present) {
255 #ifdef CONFIG_BCM47XX
256 bcm47xx_nvram_init_from_mem(pflash->window, pflash->window_size);
257 #endif
258
259 ssb_pflash_data.width = pflash->buswidth;
260 ssb_pflash_resource.start = pflash->window;
261 ssb_pflash_resource.end = pflash->window + pflash->window_size;
262 }
263 }
264
ssb_cpu_clock(struct ssb_mipscore * mcore)265 u32 ssb_cpu_clock(struct ssb_mipscore *mcore)
266 {
267 struct ssb_bus *bus = mcore->dev->bus;
268 u32 pll_type, n, m, rate = 0;
269
270 if (bus->chipco.capabilities & SSB_CHIPCO_CAP_PMU)
271 return ssb_pmu_get_cpu_clock(&bus->chipco);
272
273 if (ssb_extif_available(&bus->extif)) {
274 ssb_extif_get_clockcontrol(&bus->extif, &pll_type, &n, &m);
275 } else if (ssb_chipco_available(&bus->chipco)) {
276 ssb_chipco_get_clockcpu(&bus->chipco, &pll_type, &n, &m);
277 } else
278 return 0;
279
280 if ((pll_type == SSB_PLLTYPE_5) || (bus->chip_id == 0x5365)) {
281 rate = 200000000;
282 } else {
283 rate = ssb_calc_clock_rate(pll_type, n, m);
284 }
285
286 if (pll_type == SSB_PLLTYPE_6) {
287 rate *= 2;
288 }
289
290 return rate;
291 }
292
ssb_mipscore_init(struct ssb_mipscore * mcore)293 void ssb_mipscore_init(struct ssb_mipscore *mcore)
294 {
295 struct ssb_bus *bus;
296 struct ssb_device *dev;
297 unsigned long hz, ns;
298 unsigned int irq, i;
299
300 if (!mcore->dev)
301 return; /* We don't have a MIPS core */
302
303 dev_dbg(mcore->dev->dev, "Initializing MIPS core...\n");
304
305 bus = mcore->dev->bus;
306 hz = ssb_clockspeed(bus);
307 if (!hz)
308 hz = 100000000;
309 ns = 1000000000 / hz;
310
311 if (ssb_extif_available(&bus->extif))
312 ssb_extif_timing_init(&bus->extif, ns);
313 else if (ssb_chipco_available(&bus->chipco))
314 ssb_chipco_timing_init(&bus->chipco, ns);
315
316 /* Assign IRQs to all cores on the bus, start with irq line 2, because serial usually takes 1 */
317 for (irq = 2, i = 0; i < bus->nr_devices; i++) {
318 int mips_irq;
319 dev = &(bus->devices[i]);
320 mips_irq = ssb_mips_irq(dev);
321 if (mips_irq > 4)
322 dev->irq = 0;
323 else
324 dev->irq = mips_irq + 2;
325 if (dev->irq > 5)
326 continue;
327 switch (dev->id.coreid) {
328 case SSB_DEV_USB11_HOST:
329 /* shouldn't need a separate irq line for non-4710, most of them have a proper
330 * external usb controller on the pci */
331 if ((bus->chip_id == 0x4710) && (irq <= 4)) {
332 set_irq(dev, irq++);
333 }
334 break;
335 case SSB_DEV_PCI:
336 case SSB_DEV_ETHERNET:
337 case SSB_DEV_ETHERNET_GBIT:
338 case SSB_DEV_80211:
339 case SSB_DEV_USB20_HOST:
340 /* These devices get their own IRQ line if available, the rest goes on IRQ0 */
341 if (irq <= 4) {
342 set_irq(dev, irq++);
343 break;
344 }
345 fallthrough;
346 case SSB_DEV_EXTIF:
347 set_irq(dev, 0);
348 break;
349 }
350 }
351 dev_dbg(mcore->dev->dev, "after irq reconfiguration\n");
352 dump_irq(bus);
353
354 ssb_mips_serial_init(mcore);
355 ssb_mips_flash_detect(mcore);
356 }
357