diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2014-12-12 13:05:25 (GMT) |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2014-12-14 05:32:05 (GMT) |
| commit | a2927e09bccca5b665709d77fc54919292d4bcb7 (patch) | |
| tree | 0852399092f7a8184f74e8fc25f06154127a72ed /drivers | |
| parent | 568868dda9b8f8e901962231713fc0cb3f42c410 (diff) | |
| download | u-boot-a2927e09bccca5b665709d77fc54919292d4bcb7.tar.xz | |
x86: Add a simple superio driver for SMSC LPC47M
On most x86 boards, the legacy serial ports (io address 0x3f8/0x2f8)
are provided by a superio chip connected to the LPC bus. We must
program the superio chip so that serial ports are available for us.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/misc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/smsc_lpc47m.c | 33 |
2 files changed, 34 insertions, 0 deletions
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 6fa836f..a34972d 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_PDSP188x) += pdsp188x.o ifdef CONFIG_DM_I2C obj-$(CONFIG_SANDBOX) += i2c_eeprom_emul.o endif +obj-$(CONFIG_SMSC_LPC47M) += smsc_lpc47m.o obj-$(CONFIG_STATUS_LED) += status_led.o obj-$(CONFIG_TWL4030_LED) += twl4030_led.o obj-$(CONFIG_FSL_IFC) += fsl_ifc.o diff --git a/drivers/misc/smsc_lpc47m.c b/drivers/misc/smsc_lpc47m.c new file mode 100644 index 0000000..d51f8e3 --- /dev/null +++ b/drivers/misc/smsc_lpc47m.c @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/pnp_def.h> + +static void pnp_enter_conf_state(u16 dev) +{ + u16 port = dev >> 8; + + outb(0x55, port); +} + +static void pnp_exit_conf_state(u16 dev) +{ + u16 port = dev >> 8; + + outb(0xaa, port); +} + +void lpc47m_enable_serial(u16 dev, u16 iobase) +{ + pnp_enter_conf_state(dev); + pnp_set_logical_device(dev); + pnp_set_enable(dev, 0); + pnp_set_iobase(dev, PNP_IDX_IO0, iobase); + pnp_set_enable(dev, 1); + pnp_exit_conf_state(dev); +} |