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 <linux/ssb/ssb.h>
12
13 #include <linux/serial.h>
14 #include <linux/serial_core.h>
15 #include <linux/serial_reg.h>
16 #include <linux/time.h>
17
18 #include "ssb_private.h"
19
20
mips_read32(struct ssb_mipscore * mcore,u16 offset)21 static inline u32 mips_read32(struct ssb_mipscore *mcore,
22 u16 offset)
23 {
24 return ssb_read32(mcore->dev, offset);
25 }
26
mips_write32(struct ssb_mipscore * mcore,u16 offset,u32 value)27 static inline void mips_write32(struct ssb_mipscore *mcore,
28 u16 offset,
29 u32 value)
30 {
31 ssb_write32(mcore->dev, offset, value);
32 }
33
34 static const u32 ipsflag_irq_mask[] = {
35 0,
36 SSB_IPSFLAG_IRQ1,
37 SSB_IPSFLAG_IRQ2,
38 SSB_IPSFLAG_IRQ3,
39 SSB_IPSFLAG_IRQ4,
40 };
41
42 static const u32 ipsflag_irq_shift[] = {
43 0,
44 SSB_IPSFLAG_IRQ1_SHIFT,
45 SSB_IPSFLAG_IRQ2_SHIFT,
46 SSB_IPSFLAG_IRQ3_SHIFT,
47 SSB_IPSFLAG_IRQ4_SHIFT,
48 };
49
ssb_irqflag(struct ssb_device * dev)50 static inline u32 ssb_irqflag(struct ssb_device *dev)
51 {
52 u32 tpsflag = ssb_read32(dev, SSB_TPSFLAG);
53 if (tpsflag)
54 return ssb_read32(dev, SSB_TPSFLAG) & SSB_TPSFLAG_BPFLAG;
55 else
56 /* not irq supported */
57 return 0x3f;
58 }
59
find_device(struct ssb_device * rdev,int irqflag)60 static struct ssb_device *find_device(struct ssb_device *rdev, int irqflag)
61 {
62 struct ssb_bus *bus = rdev->bus;
63 int i;
64 for (i = 0; i < bus->nr_devices; i++) {
65 struct ssb_device *dev;
66 dev = &(bus->devices[i]);
67 if (ssb_irqflag(dev) == irqflag)
68 return dev;
69 }
70 return NULL;
71 }
72
73 /* Get the MIPS IRQ assignment for a specified device.
74 * If unassigned, 0 is returned.
75 * If disabled, 5 is returned.
76 * If not supported, 6 is returned.
77 */
ssb_mips_irq(struct ssb_device * dev)78 unsigned int ssb_mips_irq(struct ssb_device *dev)
79 {
80 struct ssb_bus *bus = dev->bus;
81 struct ssb_device *mdev = bus->mipscore.dev;
82 u32 irqflag;
83 u32 ipsflag;
84 u32 tmp;
85 unsigned int irq;
86
87 irqflag = ssb_irqflag(dev);
88 if (irqflag == 0x3f)
89 return 6;
90 ipsflag = ssb_read32(bus->mipscore.dev, SSB_IPSFLAG);
91 for (irq = 1; irq <= 4; irq++) {
92 tmp = ((ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq]);
93 if (tmp == irqflag)
94 break;
95 }
96 if (irq == 5) {
97 if ((1 << irqflag) & ssb_read32(mdev, SSB_INTVEC))
98 irq = 0;
99 }
100
101 return irq;
102 }
103
clear_irq(struct ssb_bus * bus,unsigned int irq)104 static void clear_irq(struct ssb_bus *bus, unsigned int irq)
105 {
106 struct ssb_device *dev = bus->mipscore.dev;
107
108 /* Clear the IRQ in the MIPScore backplane registers */
109 if (irq == 0) {
110 ssb_write32(dev, SSB_INTVEC, 0);
111 } else {
112 ssb_write32(dev, SSB_IPSFLAG,
113 ssb_read32(dev, SSB_IPSFLAG) |
114 ipsflag_irq_mask[irq]);
115 }
116 }
117
set_irq(struct ssb_device * dev,unsigned int irq)118 static void set_irq(struct ssb_device *dev, unsigned int irq)
119 {
120 unsigned int oldirq = ssb_mips_irq(dev);
121 struct ssb_bus *bus = dev->bus;
122 struct ssb_device *mdev = bus->mipscore.dev;
123 u32 irqflag = ssb_irqflag(dev);
124
125 BUG_ON(oldirq == 6);
126
127 dev->irq = irq + 2;
128
129 /* clear the old irq */
130 if (oldirq == 0)
131 ssb_write32(mdev, SSB_INTVEC, (~(1 << irqflag) & ssb_read32(mdev, SSB_INTVEC)));
132 else if (oldirq != 5)
133 clear_irq(bus, oldirq);
134
135 /* assign the new one */
136 if (irq == 0) {
137 ssb_write32(mdev, SSB_INTVEC, ((1 << irqflag) | ssb_read32(mdev, SSB_INTVEC)));
138 } else {
139 u32 ipsflag = ssb_read32(mdev, SSB_IPSFLAG);
140 if ((ipsflag & ipsflag_irq_mask[irq]) != ipsflag_irq_mask[irq]) {
141 u32 oldipsflag = (ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq];
142 struct ssb_device *olddev = find_device(dev, oldipsflag);
143 if (olddev)
144 set_irq(olddev, 0);
145 }
146 irqflag <<= ipsflag_irq_shift[irq];
147 irqflag |= (ipsflag & ~ipsflag_irq_mask[irq]);
148 ssb_write32(mdev, SSB_IPSFLAG, irqflag);
149 }
150 ssb_dprintk(KERN_INFO PFX
151 "set_irq: core 0x%04x, irq %d => %d\n",
152 dev->id.coreid, oldirq+2, irq+2);
153 }
154
print_irq(struct ssb_device * dev,unsigned int irq)155 static void print_irq(struct ssb_device *dev, unsigned int irq)
156 {
157 int i;
158 static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
159 ssb_dprintk(KERN_INFO PFX
160 "core 0x%04x, irq :", dev->id.coreid);
161 for (i = 0; i <= 6; i++) {
162 ssb_dprintk(" %s%s", irq_name[i], i==irq?"*":" ");
163 }
164 ssb_dprintk("\n");
165 }
166
dump_irq(struct ssb_bus * bus)167 static void dump_irq(struct ssb_bus *bus)
168 {
169 int i;
170 for (i = 0; i < bus->nr_devices; i++) {
171 struct ssb_device *dev;
172 dev = &(bus->devices[i]);
173 print_irq(dev, ssb_mips_irq(dev));
174 }
175 }
176
ssb_mips_serial_init(struct ssb_mipscore * mcore)177 static void ssb_mips_serial_init(struct ssb_mipscore *mcore)
178 {
179 struct ssb_bus *bus = mcore->dev->bus;
180
181 if (bus->extif.dev)
182 mcore->nr_serial_ports = ssb_extif_serial_init(&bus->extif, mcore->serial_ports);
183 else if (bus->chipco.dev)
184 mcore->nr_serial_ports = ssb_chipco_serial_init(&bus->chipco, mcore->serial_ports);
185 else
186 mcore->nr_serial_ports = 0;
187 }
188
ssb_mips_flash_detect(struct ssb_mipscore * mcore)189 static void ssb_mips_flash_detect(struct ssb_mipscore *mcore)
190 {
191 struct ssb_bus *bus = mcore->dev->bus;
192
193 mcore->flash_buswidth = 2;
194 if (bus->chipco.dev) {
195 mcore->flash_window = 0x1c000000;
196 mcore->flash_window_size = 0x02000000;
197 if ((ssb_read32(bus->chipco.dev, SSB_CHIPCO_FLASH_CFG)
198 & SSB_CHIPCO_CFG_DS16) == 0)
199 mcore->flash_buswidth = 1;
200 } else {
201 mcore->flash_window = 0x1fc00000;
202 mcore->flash_window_size = 0x00400000;
203 }
204 }
205
ssb_cpu_clock(struct ssb_mipscore * mcore)206 u32 ssb_cpu_clock(struct ssb_mipscore *mcore)
207 {
208 struct ssb_bus *bus = mcore->dev->bus;
209 u32 pll_type, n, m, rate = 0;
210
211 if (bus->chipco.capabilities & SSB_CHIPCO_CAP_PMU)
212 return ssb_pmu_get_cpu_clock(&bus->chipco);
213
214 if (bus->extif.dev) {
215 ssb_extif_get_clockcontrol(&bus->extif, &pll_type, &n, &m);
216 } else if (bus->chipco.dev) {
217 ssb_chipco_get_clockcpu(&bus->chipco, &pll_type, &n, &m);
218 } else
219 return 0;
220
221 if ((pll_type == SSB_PLLTYPE_5) || (bus->chip_id == 0x5365)) {
222 rate = 200000000;
223 } else {
224 rate = ssb_calc_clock_rate(pll_type, n, m);
225 }
226
227 if (pll_type == SSB_PLLTYPE_6) {
228 rate *= 2;
229 }
230
231 return rate;
232 }
233
ssb_mipscore_init(struct ssb_mipscore * mcore)234 void ssb_mipscore_init(struct ssb_mipscore *mcore)
235 {
236 struct ssb_bus *bus;
237 struct ssb_device *dev;
238 unsigned long hz, ns;
239 unsigned int irq, i;
240
241 if (!mcore->dev)
242 return; /* We don't have a MIPS core */
243
244 ssb_dprintk(KERN_INFO PFX "Initializing MIPS core...\n");
245
246 bus = mcore->dev->bus;
247 hz = ssb_clockspeed(bus);
248 if (!hz)
249 hz = 100000000;
250 ns = 1000000000 / hz;
251
252 if (bus->extif.dev)
253 ssb_extif_timing_init(&bus->extif, ns);
254 else if (bus->chipco.dev)
255 ssb_chipco_timing_init(&bus->chipco, ns);
256
257 /* Assign IRQs to all cores on the bus, start with irq line 2, because serial usually takes 1 */
258 for (irq = 2, i = 0; i < bus->nr_devices; i++) {
259 int mips_irq;
260 dev = &(bus->devices[i]);
261 mips_irq = ssb_mips_irq(dev);
262 if (mips_irq > 4)
263 dev->irq = 0;
264 else
265 dev->irq = mips_irq + 2;
266 if (dev->irq > 5)
267 continue;
268 switch (dev->id.coreid) {
269 case SSB_DEV_USB11_HOST:
270 /* shouldn't need a separate irq line for non-4710, most of them have a proper
271 * external usb controller on the pci */
272 if ((bus->chip_id == 0x4710) && (irq <= 4)) {
273 set_irq(dev, irq++);
274 }
275 break;
276 case SSB_DEV_PCI:
277 case SSB_DEV_ETHERNET:
278 case SSB_DEV_ETHERNET_GBIT:
279 case SSB_DEV_80211:
280 case SSB_DEV_USB20_HOST:
281 /* These devices get their own IRQ line if available, the rest goes on IRQ0 */
282 if (irq <= 4) {
283 set_irq(dev, irq++);
284 break;
285 }
286 /* fallthrough */
287 case SSB_DEV_EXTIF:
288 set_irq(dev, 0);
289 break;
290 }
291 }
292 ssb_dprintk(KERN_INFO PFX "after irq reconfiguration\n");
293 dump_irq(bus);
294
295 ssb_mips_serial_init(mcore);
296 ssb_mips_flash_detect(mcore);
297 }
298