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[karo-tx-linux.git] / drivers / bcma / driver_mips.c
1 /*
2  * Broadcom specific AMBA
3  * Broadcom MIPS32 74K core driver
4  *
5  * Copyright 2009, Broadcom Corporation
6  * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
7  * Copyright 2010, Bernhard Loos <bernhardloos@googlemail.com>
8  * Copyright 2011, Hauke Mehrtens <hauke@hauke-m.de>
9  *
10  * Licensed under the GNU/GPL. See COPYING for details.
11  */
12
13 #include "bcma_private.h"
14
15 #include <linux/bcma/bcma.h>
16
17 #include <linux/serial.h>
18 #include <linux/serial_core.h>
19 #include <linux/serial_reg.h>
20 #include <linux/time.h>
21
22 /* The 47162a0 hangs when reading MIPS DMP registers registers */
23 static inline bool bcma_core_mips_bcm47162a0_quirk(struct bcma_device *dev)
24 {
25         return dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM47162 &&
26                dev->bus->chipinfo.rev == 0 && dev->id.id == BCMA_CORE_MIPS_74K;
27 }
28
29 /* The 5357b0 hangs when reading USB20H DMP registers */
30 static inline bool bcma_core_mips_bcm5357b0_quirk(struct bcma_device *dev)
31 {
32         return (dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM5357 ||
33                 dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM4749) &&
34                dev->bus->chipinfo.pkg == 11 &&
35                dev->id.id == BCMA_CORE_USB20_HOST;
36 }
37
38 static inline u32 mips_read32(struct bcma_drv_mips *mcore,
39                               u16 offset)
40 {
41         return bcma_read32(mcore->core, offset);
42 }
43
44 static inline void mips_write32(struct bcma_drv_mips *mcore,
45                                 u16 offset,
46                                 u32 value)
47 {
48         bcma_write32(mcore->core, offset, value);
49 }
50
51 static const u32 ipsflag_irq_mask[] = {
52         0,
53         BCMA_MIPS_IPSFLAG_IRQ1,
54         BCMA_MIPS_IPSFLAG_IRQ2,
55         BCMA_MIPS_IPSFLAG_IRQ3,
56         BCMA_MIPS_IPSFLAG_IRQ4,
57 };
58
59 static const u32 ipsflag_irq_shift[] = {
60         0,
61         BCMA_MIPS_IPSFLAG_IRQ1_SHIFT,
62         BCMA_MIPS_IPSFLAG_IRQ2_SHIFT,
63         BCMA_MIPS_IPSFLAG_IRQ3_SHIFT,
64         BCMA_MIPS_IPSFLAG_IRQ4_SHIFT,
65 };
66
67 static u32 bcma_core_mips_irqflag(struct bcma_device *dev)
68 {
69         u32 flag;
70
71         if (bcma_core_mips_bcm47162a0_quirk(dev))
72                 return dev->core_index;
73         if (bcma_core_mips_bcm5357b0_quirk(dev))
74                 return dev->core_index;
75         flag = bcma_aread32(dev, BCMA_MIPS_OOBSELOUTA30);
76
77         if (flag)
78                 return flag & 0x1F;
79         else
80                 return 0x3f;
81 }
82
83 /* Get the MIPS IRQ assignment for a specified device.
84  * If unassigned, 0 is returned.
85  * If disabled, 5 is returned.
86  * If not supported, 6 is returned.
87  */
88 static unsigned int bcma_core_mips_irq(struct bcma_device *dev)
89 {
90         struct bcma_device *mdev = dev->bus->drv_mips.core;
91         u32 irqflag;
92         unsigned int irq;
93
94         irqflag = bcma_core_mips_irqflag(dev);
95         if (irqflag == 0x3f)
96                 return 6;
97
98         for (irq = 0; irq <= 4; irq++)
99                 if (bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq)) &
100                     (1 << irqflag))
101                         return irq;
102
103         return 5;
104 }
105
106 unsigned int bcma_core_irq(struct bcma_device *dev)
107 {
108         unsigned int mips_irq = bcma_core_mips_irq(dev);
109         return mips_irq <= 4 ? mips_irq + 2 : 0;
110 }
111 EXPORT_SYMBOL(bcma_core_irq);
112
113 static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
114 {
115         unsigned int oldirq = bcma_core_mips_irq(dev);
116         struct bcma_bus *bus = dev->bus;
117         struct bcma_device *mdev = bus->drv_mips.core;
118         u32 irqflag;
119
120         irqflag = bcma_core_mips_irqflag(dev);
121         BUG_ON(oldirq == 6);
122
123         dev->irq = irq + 2;
124
125         /* clear the old irq */
126         if (oldirq == 0)
127                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
128                             bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) &
129                             ~(1 << irqflag));
130         else if (oldirq != 5)
131                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(oldirq), 0);
132
133         /* assign the new one */
134         if (irq == 0) {
135                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
136                             bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) |
137                             (1 << irqflag));
138         } else {
139                 u32 irqinitmask = bcma_read32(mdev,
140                                               BCMA_MIPS_MIPS74K_INTMASK(irq));
141                 if (irqinitmask) {
142                         struct bcma_device *core;
143
144                         /* backplane irq line is in use, find out who uses
145                          * it and set user to irq 0
146                          */
147                         list_for_each_entry(core, &bus->cores, list) {
148                                 if ((1 << bcma_core_mips_irqflag(core)) ==
149                                     irqinitmask) {
150                                         bcma_core_mips_set_irq(core, 0);
151                                         break;
152                                 }
153                         }
154                 }
155                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq),
156                              1 << irqflag);
157         }
158
159         bcma_debug(bus, "set_irq: core 0x%04x, irq %d => %d\n",
160                    dev->id.id, oldirq <= 4 ? oldirq + 2 : 0, irq + 2);
161 }
162
163 static void bcma_core_mips_set_irq_name(struct bcma_bus *bus, unsigned int irq,
164                                         u16 coreid, u8 unit)
165 {
166         struct bcma_device *core;
167
168         core = bcma_find_core_unit(bus, coreid, unit);
169         if (!core) {
170                 bcma_warn(bus,
171                           "Can not find core (id: 0x%x, unit %i) for IRQ configuration.\n",
172                           coreid, unit);
173                 return;
174         }
175
176         bcma_core_mips_set_irq(core, irq);
177 }
178
179 static void bcma_core_mips_print_irq(struct bcma_device *dev, unsigned int irq)
180 {
181         int i;
182         static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
183         printk(KERN_DEBUG KBUILD_MODNAME ": core 0x%04x, irq :", dev->id.id);
184         for (i = 0; i <= 6; i++)
185                 printk(" %s%s", irq_name[i], i == irq ? "*" : " ");
186         printk("\n");
187 }
188
189 static void bcma_core_mips_dump_irq(struct bcma_bus *bus)
190 {
191         struct bcma_device *core;
192
193         list_for_each_entry(core, &bus->cores, list) {
194                 bcma_core_mips_print_irq(core, bcma_core_mips_irq(core));
195         }
196 }
197
198 u32 bcma_cpu_clock(struct bcma_drv_mips *mcore)
199 {
200         struct bcma_bus *bus = mcore->core->bus;
201
202         if (bus->drv_cc.capabilities & BCMA_CC_CAP_PMU)
203                 return bcma_pmu_get_cpu_clock(&bus->drv_cc);
204
205         bcma_err(bus, "No PMU available, need this to get the cpu clock\n");
206         return 0;
207 }
208 EXPORT_SYMBOL(bcma_cpu_clock);
209
210 static void bcma_core_mips_flash_detect(struct bcma_drv_mips *mcore)
211 {
212         struct bcma_bus *bus = mcore->core->bus;
213         struct bcma_drv_cc *cc = &bus->drv_cc;
214
215         switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
216         case BCMA_CC_FLASHT_STSER:
217         case BCMA_CC_FLASHT_ATSER:
218                 bcma_debug(bus, "Found serial flash\n");
219                 bcma_sflash_init(cc);
220                 break;
221         case BCMA_CC_FLASHT_PARA:
222                 bcma_debug(bus, "Found parallel flash\n");
223                 cc->pflash.present = true;
224                 cc->pflash.window = BCMA_SOC_FLASH2;
225                 cc->pflash.window_size = BCMA_SOC_FLASH2_SZ;
226
227                 if ((bcma_read32(cc->core, BCMA_CC_FLASH_CFG) &
228                      BCMA_CC_FLASH_CFG_DS) == 0)
229                         cc->pflash.buswidth = 1;
230                 else
231                         cc->pflash.buswidth = 2;
232                 break;
233         default:
234                 bcma_err(bus, "Flash type not supported\n");
235         }
236
237         if (cc->core->id.rev == 38 ||
238             bus->chipinfo.id == BCMA_CHIP_ID_BCM4706) {
239                 if (cc->capabilities & BCMA_CC_CAP_NFLASH) {
240                         bcma_debug(bus, "Found NAND flash\n");
241                         bcma_nflash_init(cc);
242                 }
243         }
244 }
245
246 void bcma_core_mips_early_init(struct bcma_drv_mips *mcore)
247 {
248         struct bcma_bus *bus = mcore->core->bus;
249
250         if (mcore->early_setup_done)
251                 return;
252
253         bcma_chipco_serial_init(&bus->drv_cc);
254         bcma_core_mips_flash_detect(mcore);
255
256         mcore->early_setup_done = true;
257 }
258
259 void bcma_core_mips_init(struct bcma_drv_mips *mcore)
260 {
261         struct bcma_bus *bus;
262         struct bcma_device *core;
263         bus = mcore->core->bus;
264
265         if (mcore->setup_done)
266                 return;
267
268         bcma_debug(bus, "Initializing MIPS core...\n");
269
270         bcma_core_mips_early_init(mcore);
271
272         switch (bus->chipinfo.id) {
273         case BCMA_CHIP_ID_BCM4716:
274         case BCMA_CHIP_ID_BCM4748:
275                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
276                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
277                 bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_USB20_HOST, 0);
278                 bcma_core_mips_set_irq_name(bus, 4, BCMA_CORE_PCIE, 0);
279                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
280                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_I2S, 0);
281                 break;
282         case BCMA_CHIP_ID_BCM5356:
283         case BCMA_CHIP_ID_BCM47162:
284         case BCMA_CHIP_ID_BCM53572:
285                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
286                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
287                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
288                 break;
289         case BCMA_CHIP_ID_BCM5357:
290         case BCMA_CHIP_ID_BCM4749:
291                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
292                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
293                 bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_USB20_HOST, 0);
294                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
295                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_I2S, 0);
296                 break;
297         case BCMA_CHIP_ID_BCM4706:
298                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_PCIE, 0);
299                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_4706_MAC_GBIT,
300                                             0);
301                 bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_PCIE, 1);
302                 bcma_core_mips_set_irq_name(bus, 4, BCMA_CORE_USB20_HOST, 0);
303                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_4706_CHIPCOMMON,
304                                             0);
305                 break;
306         default:
307                 list_for_each_entry(core, &bus->cores, list) {
308                         core->irq = bcma_core_irq(core);
309                 }
310                 bcma_err(bus,
311                          "Unknown device (0x%x) found, can not configure IRQs\n",
312                          bus->chipinfo.id);
313         }
314         bcma_debug(bus, "IRQ reconfiguration done\n");
315         bcma_core_mips_dump_irq(bus);
316
317         mcore->setup_done = true;
318 }