xref: /openbmc/linux/drivers/ssb/driver_mipscore.c (revision 9d749629)
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/mtd/physmap.h>
14 #include <linux/serial.h>
15 #include <linux/serial_core.h>
16 #include <linux/serial_reg.h>
17 #include <linux/time.h>
18 
19 #include "ssb_private.h"
20 
21 static const char *part_probes[] = { "bcm47xxpart", NULL };
22 
23 static struct physmap_flash_data ssb_pflash_data = {
24 	.part_probe_types	= part_probes,
25 };
26 
27 static struct resource ssb_pflash_resource = {
28 	.name	= "ssb_pflash",
29 	.flags  = IORESOURCE_MEM,
30 };
31 
32 struct platform_device ssb_pflash_dev = {
33 	.name		= "physmap-flash",
34 	.dev		= {
35 		.platform_data  = &ssb_pflash_data,
36 	},
37 	.resource	= &ssb_pflash_resource,
38 	.num_resources	= 1,
39 };
40 
41 static inline u32 mips_read32(struct ssb_mipscore *mcore,
42 			      u16 offset)
43 {
44 	return ssb_read32(mcore->dev, offset);
45 }
46 
47 static inline void mips_write32(struct ssb_mipscore *mcore,
48 				u16 offset,
49 				u32 value)
50 {
51 	ssb_write32(mcore->dev, offset, value);
52 }
53 
54 static const u32 ipsflag_irq_mask[] = {
55 	0,
56 	SSB_IPSFLAG_IRQ1,
57 	SSB_IPSFLAG_IRQ2,
58 	SSB_IPSFLAG_IRQ3,
59 	SSB_IPSFLAG_IRQ4,
60 };
61 
62 static const u32 ipsflag_irq_shift[] = {
63 	0,
64 	SSB_IPSFLAG_IRQ1_SHIFT,
65 	SSB_IPSFLAG_IRQ2_SHIFT,
66 	SSB_IPSFLAG_IRQ3_SHIFT,
67 	SSB_IPSFLAG_IRQ4_SHIFT,
68 };
69 
70 static inline u32 ssb_irqflag(struct ssb_device *dev)
71 {
72 	u32 tpsflag = ssb_read32(dev, SSB_TPSFLAG);
73 	if (tpsflag)
74 		return ssb_read32(dev, SSB_TPSFLAG) & SSB_TPSFLAG_BPFLAG;
75 	else
76 		/* not irq supported */
77 		return 0x3f;
78 }
79 
80 static struct ssb_device *find_device(struct ssb_device *rdev, int irqflag)
81 {
82 	struct ssb_bus *bus = rdev->bus;
83 	int i;
84 	for (i = 0; i < bus->nr_devices; i++) {
85 		struct ssb_device *dev;
86 		dev = &(bus->devices[i]);
87 		if (ssb_irqflag(dev) == irqflag)
88 			return dev;
89 	}
90 	return NULL;
91 }
92 
93 /* Get the MIPS IRQ assignment for a specified device.
94  * If unassigned, 0 is returned.
95  * If disabled, 5 is returned.
96  * If not supported, 6 is returned.
97  */
98 unsigned int ssb_mips_irq(struct ssb_device *dev)
99 {
100 	struct ssb_bus *bus = dev->bus;
101 	struct ssb_device *mdev = bus->mipscore.dev;
102 	u32 irqflag;
103 	u32 ipsflag;
104 	u32 tmp;
105 	unsigned int irq;
106 
107 	irqflag = ssb_irqflag(dev);
108 	if (irqflag == 0x3f)
109 		return 6;
110 	ipsflag = ssb_read32(bus->mipscore.dev, SSB_IPSFLAG);
111 	for (irq = 1; irq <= 4; irq++) {
112 		tmp = ((ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq]);
113 		if (tmp == irqflag)
114 			break;
115 	}
116 	if (irq	== 5) {
117 		if ((1 << irqflag) & ssb_read32(mdev, SSB_INTVEC))
118 			irq = 0;
119 	}
120 
121 	return irq;
122 }
123 
124 static void clear_irq(struct ssb_bus *bus, unsigned int irq)
125 {
126 	struct ssb_device *dev = bus->mipscore.dev;
127 
128 	/* Clear the IRQ in the MIPScore backplane registers */
129 	if (irq == 0) {
130 		ssb_write32(dev, SSB_INTVEC, 0);
131 	} else {
132 		ssb_write32(dev, SSB_IPSFLAG,
133 			    ssb_read32(dev, SSB_IPSFLAG) |
134 			    ipsflag_irq_mask[irq]);
135 	}
136 }
137 
138 static void set_irq(struct ssb_device *dev, unsigned int irq)
139 {
140 	unsigned int oldirq = ssb_mips_irq(dev);
141 	struct ssb_bus *bus = dev->bus;
142 	struct ssb_device *mdev = bus->mipscore.dev;
143 	u32 irqflag = ssb_irqflag(dev);
144 
145 	BUG_ON(oldirq == 6);
146 
147 	dev->irq = irq + 2;
148 
149 	/* clear the old irq */
150 	if (oldirq == 0)
151 		ssb_write32(mdev, SSB_INTVEC, (~(1 << irqflag) & ssb_read32(mdev, SSB_INTVEC)));
152 	else if (oldirq != 5)
153 		clear_irq(bus, oldirq);
154 
155 	/* assign the new one */
156 	if (irq == 0) {
157 		ssb_write32(mdev, SSB_INTVEC, ((1 << irqflag) | ssb_read32(mdev, SSB_INTVEC)));
158 	} else {
159 		u32 ipsflag = ssb_read32(mdev, SSB_IPSFLAG);
160 		if ((ipsflag & ipsflag_irq_mask[irq]) != ipsflag_irq_mask[irq]) {
161 			u32 oldipsflag = (ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq];
162 			struct ssb_device *olddev = find_device(dev, oldipsflag);
163 			if (olddev)
164 				set_irq(olddev, 0);
165 		}
166 		irqflag <<= ipsflag_irq_shift[irq];
167 		irqflag |= (ipsflag & ~ipsflag_irq_mask[irq]);
168 		ssb_write32(mdev, SSB_IPSFLAG, irqflag);
169 	}
170 	ssb_dprintk(KERN_INFO PFX
171 		    "set_irq: core 0x%04x, irq %d => %d\n",
172 		    dev->id.coreid, oldirq+2, irq+2);
173 }
174 
175 static void print_irq(struct ssb_device *dev, unsigned int irq)
176 {
177 	int i;
178 	static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
179 	ssb_dprintk(KERN_INFO PFX
180 		"core 0x%04x, irq :", dev->id.coreid);
181 	for (i = 0; i <= 6; i++) {
182 		ssb_dprintk(" %s%s", irq_name[i], i==irq?"*":" ");
183 	}
184 	ssb_dprintk("\n");
185 }
186 
187 static void dump_irq(struct ssb_bus *bus)
188 {
189 	int i;
190 	for (i = 0; i < bus->nr_devices; i++) {
191 		struct ssb_device *dev;
192 		dev = &(bus->devices[i]);
193 		print_irq(dev, ssb_mips_irq(dev));
194 	}
195 }
196 
197 static void ssb_mips_serial_init(struct ssb_mipscore *mcore)
198 {
199 	struct ssb_bus *bus = mcore->dev->bus;
200 
201 	if (ssb_extif_available(&bus->extif))
202 		mcore->nr_serial_ports = ssb_extif_serial_init(&bus->extif, mcore->serial_ports);
203 	else if (ssb_chipco_available(&bus->chipco))
204 		mcore->nr_serial_ports = ssb_chipco_serial_init(&bus->chipco, mcore->serial_ports);
205 	else
206 		mcore->nr_serial_ports = 0;
207 }
208 
209 static void ssb_mips_flash_detect(struct ssb_mipscore *mcore)
210 {
211 	struct ssb_bus *bus = mcore->dev->bus;
212 	struct ssb_pflash *pflash = &mcore->pflash;
213 
214 	/* When there is no chipcommon on the bus there is 4MB flash */
215 	if (!ssb_chipco_available(&bus->chipco)) {
216 		pflash->present = true;
217 		pflash->buswidth = 2;
218 		pflash->window = SSB_FLASH1;
219 		pflash->window_size = SSB_FLASH1_SZ;
220 		goto ssb_pflash;
221 	}
222 
223 	/* There is ChipCommon, so use it to read info about flash */
224 	switch (bus->chipco.capabilities & SSB_CHIPCO_CAP_FLASHT) {
225 	case SSB_CHIPCO_FLASHT_STSER:
226 	case SSB_CHIPCO_FLASHT_ATSER:
227 		pr_debug("Found serial flash\n");
228 		ssb_sflash_init(&bus->chipco);
229 		break;
230 	case SSB_CHIPCO_FLASHT_PARA:
231 		pr_debug("Found parallel flash\n");
232 		pflash->present = true;
233 		pflash->window = SSB_FLASH2;
234 		pflash->window_size = SSB_FLASH2_SZ;
235 		if ((ssb_read32(bus->chipco.dev, SSB_CHIPCO_FLASH_CFG)
236 		               & SSB_CHIPCO_CFG_DS16) == 0)
237 			pflash->buswidth = 1;
238 		else
239 			pflash->buswidth = 2;
240 		break;
241 	}
242 
243 ssb_pflash:
244 	if (pflash->present) {
245 		ssb_pflash_data.width = pflash->buswidth;
246 		ssb_pflash_resource.start = pflash->window;
247 		ssb_pflash_resource.end = pflash->window + pflash->window_size;
248 	}
249 }
250 
251 u32 ssb_cpu_clock(struct ssb_mipscore *mcore)
252 {
253 	struct ssb_bus *bus = mcore->dev->bus;
254 	u32 pll_type, n, m, rate = 0;
255 
256 	if (bus->chipco.capabilities & SSB_CHIPCO_CAP_PMU)
257 		return ssb_pmu_get_cpu_clock(&bus->chipco);
258 
259 	if (ssb_extif_available(&bus->extif)) {
260 		ssb_extif_get_clockcontrol(&bus->extif, &pll_type, &n, &m);
261 	} else if (ssb_chipco_available(&bus->chipco)) {
262 		ssb_chipco_get_clockcpu(&bus->chipco, &pll_type, &n, &m);
263 	} else
264 		return 0;
265 
266 	if ((pll_type == SSB_PLLTYPE_5) || (bus->chip_id == 0x5365)) {
267 		rate = 200000000;
268 	} else {
269 		rate = ssb_calc_clock_rate(pll_type, n, m);
270 	}
271 
272 	if (pll_type == SSB_PLLTYPE_6) {
273 		rate *= 2;
274 	}
275 
276 	return rate;
277 }
278 
279 void ssb_mipscore_init(struct ssb_mipscore *mcore)
280 {
281 	struct ssb_bus *bus;
282 	struct ssb_device *dev;
283 	unsigned long hz, ns;
284 	unsigned int irq, i;
285 
286 	if (!mcore->dev)
287 		return; /* We don't have a MIPS core */
288 
289 	ssb_dprintk(KERN_INFO PFX "Initializing MIPS core...\n");
290 
291 	bus = mcore->dev->bus;
292 	hz = ssb_clockspeed(bus);
293 	if (!hz)
294 		hz = 100000000;
295 	ns = 1000000000 / hz;
296 
297 	if (ssb_extif_available(&bus->extif))
298 		ssb_extif_timing_init(&bus->extif, ns);
299 	else if (ssb_chipco_available(&bus->chipco))
300 		ssb_chipco_timing_init(&bus->chipco, ns);
301 
302 	/* Assign IRQs to all cores on the bus, start with irq line 2, because serial usually takes 1 */
303 	for (irq = 2, i = 0; i < bus->nr_devices; i++) {
304 		int mips_irq;
305 		dev = &(bus->devices[i]);
306 		mips_irq = ssb_mips_irq(dev);
307 		if (mips_irq > 4)
308 			dev->irq = 0;
309 		else
310 			dev->irq = mips_irq + 2;
311 		if (dev->irq > 5)
312 			continue;
313 		switch (dev->id.coreid) {
314 		case SSB_DEV_USB11_HOST:
315 			/* shouldn't need a separate irq line for non-4710, most of them have a proper
316 			 * external usb controller on the pci */
317 			if ((bus->chip_id == 0x4710) && (irq <= 4)) {
318 				set_irq(dev, irq++);
319 			}
320 			break;
321 		case SSB_DEV_PCI:
322 		case SSB_DEV_ETHERNET:
323 		case SSB_DEV_ETHERNET_GBIT:
324 		case SSB_DEV_80211:
325 		case SSB_DEV_USB20_HOST:
326 			/* These devices get their own IRQ line if available, the rest goes on IRQ0 */
327 			if (irq <= 4) {
328 				set_irq(dev, irq++);
329 				break;
330 			}
331 			/* fallthrough */
332 		case SSB_DEV_EXTIF:
333 			set_irq(dev, 0);
334 			break;
335 		}
336 	}
337 	ssb_dprintk(KERN_INFO PFX "after irq reconfiguration\n");
338 	dump_irq(bus);
339 
340 	ssb_mips_serial_init(mcore);
341 	ssb_mips_flash_detect(mcore);
342 }
343