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authorBin Meng <bmeng.cn@gmail.com>2014-12-12 21:05:25 +0800
committerSimon Glass <sjg@chromium.org>2014-12-13 22:32:05 -0700
commita2927e09bccca5b665709d77fc54919292d4bcb7 (patch)
tree0852399092f7a8184f74e8fc25f06154127a72ed /drivers/misc
parent568868dda9b8f8e901962231713fc0cb3f42c410 (diff)
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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/misc')
-rw-r--r--drivers/misc/Makefile1
-rw-r--r--drivers/misc/smsc_lpc47m.c33
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);
+}