diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2014-12-12 21:05:25 +0800 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2014-12-13 22:32:05 -0700 |
| commit | a2927e09bccca5b665709d77fc54919292d4bcb7 (patch) | |
| tree | 0852399092f7a8184f74e8fc25f06154127a72ed /arch/x86/include/asm | |
| parent | 568868dda9b8f8e901962231713fc0cb3f42c410 (diff) | |
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 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/pnp_def.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pnp_def.h b/arch/x86/include/asm/pnp_def.h new file mode 100644 index 00000000000..24b038d26ad --- /dev/null +++ b/arch/x86/include/asm/pnp_def.h @@ -0,0 +1,90 @@ +/* + * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com> + * + * Adapted from coreboot src/include/device/pnp_def.h + * and arch/x86/include/arch/io.h + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _ASM_PNP_DEF_H_ +#define _ASM_PNP_DEF_H_ + +#include <asm/io.h> + +#define PNP_IDX_EN 0x30 +#define PNP_IDX_IO0 0x60 +#define PNP_IDX_IO1 0x62 +#define PNP_IDX_IO2 0x64 +#define PNP_IDX_IO3 0x66 +#define PNP_IDX_IRQ0 0x70 +#define PNP_IDX_IRQ1 0x72 +#define PNP_IDX_DRQ0 0x74 +#define PNP_IDX_DRQ1 0x75 +#define PNP_IDX_MSC0 0xf0 +#define PNP_IDX_MSC1 0xf1 + +/* Generic functions for pnp devices */ + +/* + * pnp device is a 16-bit integer composed of its i/o port address at high byte + * and logic function number at low byte. + */ +#define PNP_DEV(PORT, FUNC) (((PORT) << 8) | (FUNC)) + +static inline void pnp_write_config(uint16_t dev, uint8_t reg, uint8_t value) +{ + uint8_t port = dev >> 8; + + outb(reg, port); + outb(value, port + 1); +} + +static inline uint8_t pnp_read_config(uint16_t dev, uint8_t reg) +{ + uint8_t port = dev >> 8; + + outb(reg, port); + return inb(port + 1); +} + +static inline void pnp_set_logical_device(uint16_t dev) +{ + uint8_t device = dev & 0xff; + + pnp_write_config(dev, 0x07, device); +} + +static inline void pnp_set_enable(uint16_t dev, int enable) +{ + pnp_write_config(dev, PNP_IDX_EN, enable ? 1 : 0); +} + +static inline int pnp_read_enable(uint16_t dev) +{ + return !!pnp_read_config(dev, PNP_IDX_EN); +} + +static inline void pnp_set_iobase(uint16_t dev, uint8_t index, uint16_t iobase) +{ + pnp_write_config(dev, index + 0, (iobase >> 8) & 0xff); + pnp_write_config(dev, index + 1, iobase & 0xff); +} + +static inline uint16_t pnp_read_iobase(uint16_t dev, uint8_t index) +{ + return ((uint16_t)(pnp_read_config(dev, index)) << 8) | + pnp_read_config(dev, index + 1); +} + +static inline void pnp_set_irq(uint16_t dev, uint8_t index, unsigned irq) +{ + pnp_write_config(dev, index, irq); +} + +static inline void pnp_set_drq(uint16_t dev, uint8_t index, unsigned drq) +{ + pnp_write_config(dev, index, drq & 0xff); +} + +#endif /* _ASM_PNP_DEF_H_ */ |