misc: Add simple driver to enable the legacy UART on Winbond Super IO chips

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: Stefan Roese <sr@denx.de>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index cba236334c0e400101ff53c31ea1e8c57568b655..af8667f030c52c4f266351714df15401a301d372 100644 (file)
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -130,4 +130,12 @@ config RESET
          effect a reset. The uclass will try all available drivers when
          reset_walk() is called.
 
+config WINBOND_W83627
+       bool "Enable Winbond Super I/O driver"
+       help
+         If you say Y here, you will get support for the Winbond
+         W83627 Super I/O driver. This can be used to enable the
+         legacy UART or other devices in the Winbond Super IO chips
+         on X86 platforms.
+
 endmenu

diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index cd4846b4a8e93794990eb21e4b7cf8297997458d..e1e3c6b70fc047d746882e28cc40c38223e47438 100644 (file)
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -41,3 +41,4 @@ obj-$(CONFIG_FSL_SEC_MON) += fsl_sec_mon.o
 obj-$(CONFIG_PCA9551_LED) += pca9551_led.o
 obj-$(CONFIG_RESET) += reset-uclass.o
 obj-$(CONFIG_FSL_DEVICE_DISABLE) += fsl_devdis.o
+obj-$(CONFIG_WINBOND_W83627) += winbond_w83627.o

diff --git a/drivers/misc/winbond_w83627.c b/drivers/misc/winbond_w83627.c
new file mode 100644 (file)
index 0000000..59db7d9
--- /dev/null
+++ b/drivers/misc/winbond_w83627.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2016 Stefan Roese <sr@denx.de>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/pnp_def.h>
+
+#define WINBOND_ENTRY_KEY      0x87
+#define WINBOND_EXIT_KEY       0xaa
+
+/* Enable configuration: pass entry key '0x87' into index port dev twice */
+static void pnp_enter_conf_state(u16 dev)
+{
+       u16 port = dev >> 8;
+
+       outb(WINBOND_ENTRY_KEY, port);
+       outb(WINBOND_ENTRY_KEY, port);
+}
+
+/* Disable configuration: pass exit key '0xAA' into index port dev */
+static void pnp_exit_conf_state(u16 dev)
+{
+       u16 port = dev >> 8;
+
+       outb(WINBOND_EXIT_KEY, port);
+}
+
+/* Bring up early serial debugging output before the RAM is initialized */
+void winbond_enable_serial(uint dev, uint iobase, uint irq)
+{
+       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_irq(dev, PNP_IDX_IRQ0, irq);
+       pnp_set_enable(dev, 1);
+       pnp_exit_conf_state(dev);
+}

diff --git a/include/winbond_w83627.h b/include/winbond_w83627.h
new file mode 100644 (file)
index 0000000..ac3bec6
--- /dev/null
+++ b/include/winbond_w83627.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2016 Stefan Roese <sr@denx.de>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#ifndef _WINBOND_W83627_H_
+#define _WINBOND_W83627_H_
+
+/* I/O address of Winbond Super IO chip */
+#define WINBOND_IO_PORT                0x2e
+
+/* Logical device number */
+#define W83627DHG_FDC          0       /* Floppy */
+#define W83627DHG_PP           1       /* Parallel port */
+#define W83627DHG_SP1          2       /* Com1 */
+#define W83627DHG_SP2          3       /* Com2 */
+#define W83627DHG_KBC          5       /* PS/2 keyboard & mouse */
+#define W83627DHG_SPI          6       /* Serial peripheral interface */
+#define W83627DHG_WDTO_PLED    8       /* WDTO#, PLED */
+#define W83627DHG_ACPI         10      /* ACPI */
+#define W83627DHG_HWM          11      /* Hardware monitor */
+#define W83627DHG_PECI_SST     12      /* PECI, SST */
+
+/**
+ * Configure the base I/O port of the specified serial device and enable the
+ * serial device.
+ *
+ * @dev: high 8 bits = super I/O port, low 8 bits = logical device number
+ * @iobase: processor I/O port address to assign to this serial device
+ * @irq: processor IRQ number to assign to this serial device
+ */
+void winbond_enable_serial(uint dev, uint iobase, uint irq);
+
+#endif /* _WINBOND_W83627_H_ */