summaryrefslogtreecommitdiff
path: root/target/linux/brcm47xx/patches-3.2/195-bcma-add-support-for-sprom-not-found-on-the-device.patch
blob: 6991576d2f2065439e940bea42e100dc44c0d4cf (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
From 332b8f6ca7da3197c631928b6bd1e7fdca87e109 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sat, 18 Feb 2012 01:16:35 +0100
Subject: [PATCH 195/202] bcma: add support for sprom not found on the device.

On SoCs the sprom is stored in the nvram in a special partition on the
flash chip. The nvram contains the sprom for the main bus, but
sometimes also for a pci devices using bcma. This patch makes it
possible for the arch code to register a function to fetch the needed
sprom from the nvram and provide it to the bcma code.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 drivers/bcma/sprom.c      |   80 ++++++++++++++++++++++++++++++++++++++++----
 include/linux/bcma/bcma.h |    6 +++
 2 files changed, 78 insertions(+), 8 deletions(-)

--- a/drivers/bcma/sprom.c
+++ b/drivers/bcma/sprom.c
@@ -16,6 +16,49 @@
 
 #define SPOFF(offset)	((offset) / sizeof(u16))
 
+static int(*get_fallback_sprom)(struct bcma_bus *dev, struct ssb_sprom *out);
+
+/**
+ * ssb_arch_register_fallback_sprom - Registers a method providing a
+ * fallback SPROM if no SPROM is found.
+ *
+ * @sprom_callback: The callback function.
+ *
+ * With this function the architecture implementation may register a
+ * callback handler which fills the SPROM data structure. The fallback is
+ * only used for PCI based SSB devices, where no valid SPROM can be found
+ * in the shadow registers.
+ *
+ * This function is useful for weird architectures that have a half-assed
+ * SSB device hardwired to their PCI bus.
+ *
+ * Note that it does only work with PCI attached SSB devices. PCMCIA
+ * devices currently don't use this fallback.
+ * Architectures must provide the SPROM for native SSB devices anyway, so
+ * the fallback also isn't used for native devices.
+ *
+ * This function is available for architecture code, only. So it is not
+ * exported.
+ */
+int bcma_arch_register_fallback_sprom(int (*sprom_callback)(struct bcma_bus *bus,
+				     struct ssb_sprom *out))
+{
+	if (get_fallback_sprom)
+		return -EEXIST;
+	get_fallback_sprom = sprom_callback;
+
+	return 0;
+}
+
+static int bcma_fill_sprom_with_fallback(struct bcma_bus *bus,
+					 struct ssb_sprom *out)
+{
+	if (!get_fallback_sprom)
+		return -ENOENT;
+
+	return get_fallback_sprom(bus, out);
+}
+
 /**************************************************
  * R/W ops.
  **************************************************/
@@ -205,23 +248,44 @@ static void bcma_sprom_extract_r8(struct
 		SSB_SROM8_FEM_ANTSWLUT) >> SSB_SROM8_FEM_ANTSWLUT_SHIFT;
 }
 
+static bool bcma_is_sprom_available(struct bcma_bus *bus)
+{
+	u32 sromctrl;
+
+	if (!(bus->drv_cc.capabilities & BCMA_CC_CAP_SPROM))
+		return false;
+
+	if (bus->drv_cc.core->id.rev >= 32) {
+		sromctrl = bcma_read32(bus->drv_cc.core, BCMA_CC_SROM_CONTROL);
+		if (!(sromctrl & BCMA_CC_SROM_CONTROL_PRESENT))
+			return false;
+	}
+	return true;
+}
+
 int bcma_sprom_get(struct bcma_bus *bus)
 {
 	u16 offset;
 	u16 *sprom;
-	u32 sromctrl;
 	int err = 0;
 
 	if (!bus->drv_cc.core)
 		return -EOPNOTSUPP;
 
-	if (!(bus->drv_cc.capabilities & BCMA_CC_CAP_SPROM))
-		return -ENOENT;
-
-	if (bus->drv_cc.core->id.rev >= 32) {
-		sromctrl = bcma_read32(bus->drv_cc.core, BCMA_CC_SROM_CONTROL);
-		if (!(sromctrl & BCMA_CC_SROM_CONTROL_PRESENT))
-			return -ENOENT;
+	if (!bcma_is_sprom_available(bus)) {
+		/*
+		 * Maybe there is no SPROM on the device?
+		 * Now we ask the arch code if there is some sprom
+		 * available for this device in some other storage
+		 */
+		err = bcma_fill_sprom_with_fallback(bus, &bus->sprom);
+		if (err) {
+			pr_warn("Using fallback SPROM failed (err %d)\n", err);
+		} else {
+			pr_debug("Using SPROM revision %d provided by"
+				 " platform.\n", bus->sprom.revision);
+			return 0;
+		}
 	}
 
 	sprom = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16),
--- a/include/linux/bcma/bcma.h
+++ b/include/linux/bcma/bcma.h
@@ -177,6 +177,12 @@ int __bcma_driver_register(struct bcma_d
 
 extern void bcma_driver_unregister(struct bcma_driver *drv);
 
+/* Set a fallback SPROM.
+ * See kdoc at the function definition for complete documentation. */
+extern int bcma_arch_register_fallback_sprom(
+		int (*sprom_callback)(struct bcma_bus *bus,
+		struct ssb_sprom *out));
+
 struct bcma_bus {
 	/* The MMIO area. */
 	void __iomem *mmio;