From 7d96166b1b1a261ddd4247befd62b35b2f482bae Mon Sep 17 00:00:00 2001 From: Bin Meng Date: Mon, 24 Aug 2015 01:00:06 -0700 Subject: [PATCH] x86: i8042: Correctly initialize the controller The existing i8042 keyboard controller driver has some issues. First of all, it does not issue a self-test command (0xaa) to the controller at the very beginning. Without this, the controller does not respond to any command at all. Secondly, it initializes the configuration byte register to turn on the keyboard's interrupt, as U-Boot does not normally allow interrupts to be processed. Finally, at the end of the initialization routine, it wrongly sets the controller to disable all interfaces including both keyboard and mouse. Signed-off-by: Bin Meng Acked-by: Simon Glass --- drivers/input/i8042.c | 43 +++++++++++++++++++++---------------------- 1 file changed, 21 insertions(+), 22 deletions(-) diff --git a/drivers/input/i8042.c b/drivers/input/i8042.c index e8f59dfc7f..9b5fa32666 100644 --- a/drivers/input/i8042.c +++ b/drivers/input/i8042.c @@ -454,51 +454,50 @@ static void kbd_conv_char(unsigned char scan_code) static int kbd_reset(void) { - /* KB Reset */ + u8 config; + + /* controller self test */ if (kbd_input_empty() == 0) return -1; + out8(I8042_CMD_REG, CMD_SELF_TEST); + if (kbd_output_full() == 0) + return -1; + if (in8(I8042_DATA_REG) != KBC_TEST_OK) + return -1; + /* keyboard reset */ + if (kbd_input_empty() == 0) + return -1; out8(I8042_DATA_REG, CMD_RESET_KBD); - if (kbd_output_full() == 0) return -1; - if (in8(I8042_DATA_REG) != KBD_ACK) return -1; - if (kbd_output_full() == 0) return -1; - if (in8(I8042_DATA_REG) != KBD_POR) return -1; + /* set AT translation and disable irq */ if (kbd_input_empty() == 0) return -1; - - /* Set KBC mode */ - out8(I8042_CMD_REG, CMD_WR_CONFIG); - - if (kbd_input_empty() == 0) + out8(I8042_CMD_REG, CMD_RD_CONFIG); + if (kbd_output_full() == 0) return -1; - - out8(I8042_DATA_REG, - CONFIG_AT_TRANS | CONFIG_SET_BIST | CONFIG_KIRQ_EN); - + config = in8(I8042_DATA_REG); + config |= CONFIG_AT_TRANS; + config &= ~(CONFIG_KIRQ_EN | CONFIG_MIRQ_EN); if (kbd_input_empty() == 0) return -1; - - /* Enable Keyboard */ - out8(I8042_CMD_REG, CMD_KBD_EN); + out8(I8042_CMD_REG, CMD_WR_CONFIG); if (kbd_input_empty() == 0) return -1; + out8(I8042_DATA_REG, config); - out8(I8042_CMD_REG, CMD_WR_CONFIG); + /* enable keyboard */ if (kbd_input_empty() == 0) return -1; - - out8(I8042_DATA_REG, - CONFIG_AT_TRANS | CONFIG_MCLK_DIS | - CONFIG_KCLK_DIS | CONFIG_SET_BIST); + out8(I8042_CMD_REG, CMD_KBD_EN); if (kbd_input_empty() == 0) return -1; -- 2.39.5