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Input: spear_keyboard - generalize keyboard frequency configuration

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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>
This commit is contained in:
Shiraz Hashim 2012-07-07 18:01:07 -07:00 committed by Dmitry Torokhov
parent f6f2efa35f
commit 98e4d4d6bc
1 changed files with 7 additions and 6 deletions
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13
drivers/input/keyboard/spear-keyboard.c
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@ -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);