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
|
From 6e8ae6e2cee0e7e5939dc7042584c808366e61e0 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sun, 27 Nov 2011 14:01:01 +0100
Subject: [PATCH 16/21] =?UTF-8?q?bcma:=20add=20function=20to=20check=20every?=
=?UTF-8?q?=2010=20=C2=B5s=20if=20a=20reg=20is=20set?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This function checks if a reg get set or cleared every 10 microseconds.
It is used in bcma_core_set_clockmode() and bcma_core_pll_ctl() to
reduce code duplication. In addition it is needed in the USB host
driver.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
drivers/bcma/core.c | 48 ++++++++++++++++++++++++++++----------------
include/linux/bcma/bcma.h | 2 +
2 files changed, 32 insertions(+), 18 deletions(-)
--- a/drivers/bcma/core.c
+++ b/drivers/bcma/core.c
@@ -51,11 +51,36 @@ int bcma_core_enable(struct bcma_device
}
EXPORT_SYMBOL_GPL(bcma_core_enable);
+/* Wait for bitmask in a register to get set or cleared.
+ * timeout is in units of ten-microseconds.
+ */
+int bcma_wait_bits(struct bcma_device *dev, u16 reg, u32 bitmask, int timeout,
+ int set)
+{
+ int i;
+ u32 val;
+
+ for (i = 0; i < timeout; i++) {
+ val = bcma_read32(dev, reg);
+ if (set) {
+ if ((val & bitmask) == bitmask)
+ return 0;
+ } else {
+ if (!(val & bitmask))
+ return 0;
+ }
+ udelay(10);
+ }
+ pr_err("Timeout waiting for bitmask %08X on register %04X to %s.\n",
+ bitmask, reg, (set ? "set" : "clear"));
+
+ return -ETIMEDOUT;
+}
+EXPORT_SYMBOL_GPL(bcma_wait_bits);
+
void bcma_core_set_clockmode(struct bcma_device *core,
enum bcma_clkmode clkmode)
{
- u16 i;
-
WARN_ON(core->id.id != BCMA_CORE_CHIPCOMMON &&
core->id.id != BCMA_CORE_PCIE &&
core->id.id != BCMA_CORE_80211);
@@ -64,15 +89,8 @@ void bcma_core_set_clockmode(struct bcma
case BCMA_CLKMODE_FAST:
bcma_set32(core, BCMA_CLKCTLST, BCMA_CLKCTLST_FORCEHT);
udelay(64);
- for (i = 0; i < 1500; i++) {
- if (bcma_read32(core, BCMA_CLKCTLST) &
- BCMA_CLKCTLST_HAVEHT) {
- i = 0;
- break;
- }
- udelay(10);
- }
- if (i)
+ if (bcma_wait_bits(core, BCMA_CLKCTLST, BCMA_CLKCTLST_HAVEHT,
+ 1500, 1))
pr_err("HT force timeout\n");
break;
case BCMA_CLKMODE_DYNAMIC:
@@ -84,22 +102,12 @@ EXPORT_SYMBOL_GPL(bcma_core_set_clockmod
void bcma_core_pll_ctl(struct bcma_device *core, u32 req, u32 status, bool on)
{
- u16 i;
-
WARN_ON(req & ~BCMA_CLKCTLST_EXTRESREQ);
WARN_ON(status & ~BCMA_CLKCTLST_EXTRESST);
if (on) {
bcma_set32(core, BCMA_CLKCTLST, req);
- for (i = 0; i < 10000; i++) {
- if ((bcma_read32(core, BCMA_CLKCTLST) & status) ==
- status) {
- i = 0;
- break;
- }
- udelay(10);
- }
- if (i)
+ if (bcma_wait_bits(core, BCMA_CLKCTLST, status, 10000, 1))
pr_err("PLL enable timeout\n");
} else {
pr_warn("Disabling PLL not supported yet!\n");
--- a/include/linux/bcma/bcma.h
+++ b/include/linux/bcma/bcma.h
@@ -283,6 +283,9 @@ static inline void bcma_maskset16(struct
bcma_write16(cc, offset, (bcma_read16(cc, offset) & mask) | set);
}
+extern int bcma_wait_bits(struct bcma_device *dev, u16 reg, u32 bitmask,
+ int timeout, int set);
+
extern bool bcma_core_is_enabled(struct bcma_device *core);
extern void bcma_core_disable(struct bcma_device *core, u32 flags);
extern int bcma_core_enable(struct bcma_device *core, u32 flags);
|
