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authorShiraz Hashim <shiraz.hashim@st.com>2012-07-08 05:01:07 +0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2012-07-08 05:01:55 +0400
commit98e4d4d6bcf130cbf5a684c4f98c345f13e2f28c (patch)
tree350634dcf4980202aa76f91cfc2c3264f2a1d51e /drivers/input/keyboard
parentf6f2efa35f6b76034e5a31a075218feaa10f1812 (diff)
downloadlinux-98e4d4d6bcf130cbf5a684c4f98c345f13e2f28c.tar.xz
Input: spear_keyboard - generalize keyboard frequency configuration
Current implementation hard coded keyboard frequency configuration assuming input clock as fixed APB (83 MHz). Generalize the configuration using clock framework APIs. Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/keyboard')
-rw-r--r--drivers/input/keyboard/spear-keyboard.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/input/keyboard/spear-keyboard.c b/drivers/input/keyboard/spear-keyboard.c
index a51cdc75466a..c499387d8735 100644
--- a/drivers/input/keyboard/spear-keyboard.c
+++ b/drivers/input/keyboard/spear-keyboard.c
@@ -33,13 +33,10 @@
#define INTR_MASK 0x54
/* Register Values */
-/*
- * pclk freq mask = (APB FEQ -1)= 82 MHZ.Programme bit 15-9 in mode
- * control register as 1010010(82MHZ)
- */
-#define PCLK_FREQ_MSK 0xA400 /* 82 MHz */
#define NUM_ROWS 16
#define NUM_COLS 16
+#define MODE_CTL_PCLK_FREQ_SHIFT 9
+#define MODE_CTL_PCLK_FREQ_MSK 0x7F
#define MODE_CTL_KEYBOARD (0x2 << 0)
#define MODE_CTL_SCAN_RATE_10 (0x0 << 2)
@@ -113,8 +110,12 @@ static int spear_kbd_open(struct input_dev *dev)
if (error)
return error;
+ /* keyboard rate to be programmed is input clock (in MHz) - 1 */
+ val = clk_get_rate(kbd->clk) / 1000000 - 1;
+ val = (val & MODE_CTL_PCLK_FREQ_MSK) << MODE_CTL_PCLK_FREQ_SHIFT;
+
/* program keyboard */
- val = MODE_CTL_SCAN_RATE_80 | MODE_CTL_KEYBOARD | PCLK_FREQ_MSK |
+ val = MODE_CTL_SCAN_RATE_80 | MODE_CTL_KEYBOARD | val |
(kbd->mode << MODE_CTL_KEYNUM_SHIFT);
writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
writel_relaxed(1, kbd->io_base + STATUS_REG);