summaryrefslogtreecommitdiff
path: root/target/linux/ar7/patches-2.6.32/160-vlynq_try_remote_first.patch
blob: e75371bf996416a70f606ce641a46b1bd0957bca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
--- a/drivers/vlynq/vlynq.c
+++ b/drivers/vlynq/vlynq.c
@@ -103,6 +103,12 @@ static void vlynq_dump_mem(u32 *base, in
 }
 #endif
 
+u32 __vlynq_rev_reg(struct vlynq_regs *regs)
+{
+	return readl(&regs->revision);
+}
+EXPORT_SYMBOL(__vlynq_rev_reg);
+
 /* Check the VLYNQ link status with a given device */
 static int vlynq_linked(struct vlynq_device *dev)
 {
@@ -117,20 +123,40 @@ static int vlynq_linked(struct vlynq_dev
 	return 0;
 }
 
+static volatile int vlynq_delay_value_new = 0;
+
+static void vlynq_delay_wait(u32 count)
+{
+	/* Code adopted from original vlynq driver */
+	int i = 0;
+	volatile int *ptr = &vlynq_delay_value_new;
+	*ptr = 0;
+
+	/* We are assuming that the each cycle takes about
+	 * 23 assembly instructions. */
+	for(i = 0; i < (count + 23)/23; i++)
+		*ptr = *ptr + 1;
+}
+
 static void vlynq_reset(struct vlynq_device *dev)
 {
+	u32 rtm = readl(&dev->local->revision);
+
+	rtm = rtm < 0x00010205 || readl(&dev->local->status) & 0x800 == 0 ?
+			0 : 0x600000;
+
 	writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
 			&dev->local->control);
 
 	/* Wait for the devices to finish resetting */
-	msleep(5);
+	vlynq_delay_wait(0xffffff);
 
 	/* Remove reset bit */
-	writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
+	writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET | rtm,
 			&dev->local->control);
 
 	/* Give some time for the devices to settle */
-	msleep(5);
+	vlynq_delay_wait(0xffffff);
 }
 
 static void vlynq_irq_unmask(unsigned int irq)
@@ -379,6 +405,61 @@ void vlynq_unregister_driver(struct vlyn
 }
 EXPORT_SYMBOL(vlynq_unregister_driver);
 
+enum vlynq_clk_src {
+	vlynq_clk_external,
+	vlynq_clk_local,
+	vlynq_clk_remote,
+	vlynq_clk_invalid,
+};
+
+static int __vlynq_set_clocks(struct vlynq_device *dev,
+				enum vlynq_clk_src clk_dir,
+				int lclk_div, int rclk_div)
+{
+	u32 reg;
+
+	if (clk_dir == vlynq_clk_invalid) {
+		printk(KERN_ERR "%s: attempt to set invalid clocking\n",
+				dev_name(&dev->dev));
+		return -EINVAL;
+	}
+
+	reg = readl(&dev->local->control);
+	if (readl(&dev->local->revision) < 0x00010205) {
+		if (clk_dir & vlynq_clk_local)
+			reg |= VLYNQ_CTRL_CLOCK_INT;
+		else
+			reg &= ~VLYNQ_CTRL_CLOCK_INT;
+	}
+	reg &= ~VLYNQ_CTRL_CLOCK_MASK;
+	reg |= VLYNQ_CTRL_CLOCK_DIV(lclk_div);
+	writel(reg, &dev->local->control);
+
+	if (!vlynq_linked(dev))
+		return -ENODEV;
+
+	printk(KERN_INFO "%s: local VLYNQ protocol rev. is 0x%08x\n",
+			dev_name(&dev->dev), readl(&dev->local->revision));
+	printk(KERN_INFO "%s: remote VLYNQ protocol rev. is 0x%08x\n",
+			dev_name(&dev->dev), readl(&dev->remote->revision));
+
+	reg = readl(&dev->remote->control);
+	if (readl(&dev->remote->revision) < 0x00010205) {
+		if (clk_dir & vlynq_clk_remote)
+			reg |= VLYNQ_CTRL_CLOCK_INT;
+		else
+			reg &= ~VLYNQ_CTRL_CLOCK_INT;
+	}
+	reg &= ~VLYNQ_CTRL_CLOCK_MASK;
+	reg |= VLYNQ_CTRL_CLOCK_DIV(rclk_div);
+	writel(reg, &dev->remote->control);
+
+	if (!vlynq_linked(dev))
+		return -ENODEV;
+
+	return 0;
+}
+
 /*
  * A VLYNQ remote device can clock the VLYNQ bus master
  * using a dedicated clock line. In that case, both the
@@ -392,29 +473,17 @@ static int __vlynq_try_remote(struct vly
 	int i;
 
 	vlynq_reset(dev);
-	for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
-			i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
-		dev->dev_id ? i++ : i--) {
+	for (i = dev->dev_id ? 0 : 7; dev->dev_id ? i <= 7 : i >= 0;
+			dev->dev_id ? i++ : i--) {
 
 		if (!vlynq_linked(dev))
 			break;
 
-		writel((readl(&dev->remote->control) &
-				~VLYNQ_CTRL_CLOCK_MASK) |
-				VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
-				&dev->remote->control);
-		writel((readl(&dev->local->control)
-				& ~(VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_MASK)) |
-				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
-				&dev->local->control);
-
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using remote clock divisor %d\n",
-				dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
-			dev->divisor = i;
+		if (!__vlynq_set_clocks(dev, vlynq_clk_remote, i, i)) {
+			printk(KERN_INFO
+					"%s: using remote clock divisor %d\n",
+					dev_name(&dev->dev), i + 1);
+			dev->divisor = i + vlynq_rdiv1;
 			return 0;
 		} else {
 			vlynq_reset(dev);
@@ -437,21 +506,14 @@ static int __vlynq_try_local(struct vlyn
 
 	vlynq_reset(dev);
 
-	for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
-			i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
-		dev->dev_id ? i++ : i--) {
-
-		writel((readl(&dev->local->control) &
-				~VLYNQ_CTRL_CLOCK_MASK) |
-				VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
-				&dev->local->control);
-
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using local clock divisor %d\n",
-				dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
-			dev->divisor = i;
+	for (i = dev->dev_id ? 0 : 7; dev->dev_id ? i <= 7 : i >= 0;
+			dev->dev_id ? i++ : i--) {
+
+		if (!__vlynq_set_clocks(dev, vlynq_clk_local, i, 0)) {
+			printk(KERN_INFO
+					"%s: using local clock divisor %d\n",
+					dev_name(&dev->dev), i + 1);
+			dev->divisor = i + vlynq_ldiv1;
 			return 0;
 		} else {
 			vlynq_reset(dev);
@@ -473,18 +535,10 @@ static int __vlynq_try_external(struct v
 	if (!vlynq_linked(dev))
 		return -ENODEV;
 
-	writel((readl(&dev->remote->control) &
-			~VLYNQ_CTRL_CLOCK_INT),
-			&dev->remote->control);
-
-	writel((readl(&dev->local->control) &
-			~VLYNQ_CTRL_CLOCK_INT),
-			&dev->local->control);
-
-	if (vlynq_linked(dev)) {
-		printk(KERN_DEBUG "%s: using external clock\n",
-			dev_name(&dev->dev));
-			dev->divisor = vlynq_div_external;
+	if (!__vlynq_set_clocks(dev, vlynq_clk_external, 0, 0)) {
+		printk(KERN_INFO "%s: using external clock\n",
+				dev_name(&dev->dev));
+				dev->divisor = vlynq_div_external;
 		return 0;
 	}
 
@@ -507,18 +561,9 @@ static int __vlynq_enable_device(struct
 		 * generation negotiated by hardware.
 		 * Check which device is generating clocks and perform setup
 		 * accordingly */
-		if (vlynq_linked(dev) && readl(&dev->remote->control) &
-		   VLYNQ_CTRL_CLOCK_INT) {
-			if (!__vlynq_try_remote(dev) ||
-				!__vlynq_try_local(dev)  ||
-				!__vlynq_try_external(dev))
-				return 0;
-		} else {
-			if (!__vlynq_try_external(dev) ||
-				!__vlynq_try_local(dev)    ||
-				!__vlynq_try_remote(dev))
-				return 0;
-		}
+		if (!__vlynq_try_remote(dev) || !__vlynq_try_local(dev) ||
+						!__vlynq_try_external(dev))
+			return 0;
 		break;
 	case vlynq_ldiv1:
 	case vlynq_ldiv2:
@@ -528,15 +573,12 @@ static int __vlynq_enable_device(struct
 	case vlynq_ldiv6:
 	case vlynq_ldiv7:
 	case vlynq_ldiv8:
-		writel(VLYNQ_CTRL_CLOCK_INT |
-			VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
-			vlynq_ldiv1), &dev->local->control);
-		writel(0, &dev->remote->control);
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using local clock divisor %d\n",
-				dev_name(&dev->dev),
-				dev->divisor - vlynq_ldiv1 + 1);
+		if (!__vlynq_set_clocks(dev, vlynq_clk_local, dev->divisor -
+				vlynq_ldiv1, 0)) {
+			printk(KERN_INFO
+					"%s: using local clock divisor %d\n",
+					dev_name(&dev->dev),
+					dev->divisor - vlynq_ldiv1 + 1);
 			return 0;
 		}
 		break;
@@ -548,15 +590,12 @@ static int __vlynq_enable_device(struct
 	case vlynq_rdiv6:
 	case vlynq_rdiv7:
 	case vlynq_rdiv8:
-		writel(0, &dev->local->control);
-		writel(VLYNQ_CTRL_CLOCK_INT |
-			VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
-			vlynq_rdiv1), &dev->remote->control);
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using remote clock divisor %d\n",
-				dev_name(&dev->dev),
-				dev->divisor - vlynq_rdiv1 + 1);
+		if (!__vlynq_set_clocks(dev, vlynq_clk_remote, 0,
+				dev->divisor - vlynq_rdiv1)) {
+			printk(KERN_INFO
+					"%s: using remote clock divisor %d\n",
+					dev_name(&dev->dev),
+					dev->divisor - vlynq_rdiv1 + 1);
 			return 0;
 		}
 		break;
@@ -732,13 +771,12 @@ static int vlynq_probe(struct platform_d
 	platform_set_drvdata(pdev, dev);
 
 	printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
-	       dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
-	       (void *)dev->mem_start);
+			dev_name(&dev->dev), (void *)dev->regs_start,
+			dev->irq, (void *)dev->mem_start);
 
 	dev->dev_id = 0;
 	dev->divisor = vlynq_div_auto;
-	result = __vlynq_enable_device(dev);
-	if (result == 0) {
+	if (!__vlynq_enable_device(dev)) {
 		dev->dev_id = readl(&dev->remote->chip);
 		((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
 	}
--- a/include/linux/vlynq.h
+++ b/include/linux/vlynq.h
@@ -98,6 +98,7 @@ static inline struct vlynq_device *to_vl
 
 extern struct bus_type vlynq_bus_type;
 
+extern u32 __vlynq_rev_reg(struct vlynq_regs *regs);
 extern int __vlynq_register_driver(struct vlynq_driver *driver,
 				   struct module *owner);