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98af34f897
The SMSC SIO1007 superio chipset integrates two ns16550 compatible serial ports for legacy applications, 16 GPIO pins and some other functionalities like power management. This adds a simple driver to enable serial port and handle GPIO. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
127 lines
2.8 KiB
C
127 lines
2.8 KiB
C
/*
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* Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <errno.h>
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#include <smsc_sio1007.h>
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static inline u8 sio1007_read(int port, int reg)
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{
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outb(reg, port);
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return inb(port + 1);
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}
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static inline void sio1007_write(int port, int reg, int val)
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{
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outb(reg, port);
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outb(val, port + 1);
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}
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static inline void sio1007_clrsetbits(int port, int reg, u8 clr, u8 set)
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{
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sio1007_write(port, reg, (sio1007_read(port, reg) & ~clr) | set);
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}
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void sio1007_enable_serial(int port, int num, int iobase, int irq)
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{
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if (num < 0 || num > SIO1007_UART_NUM)
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return;
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/* enter configuration state */
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outb(0x55, port);
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/* power on serial port and set up its i/o base & irq */
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if (!num) {
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sio1007_clrsetbits(port, DEV_POWER_CTRL, 0, UART1_POWER_ON);
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sio1007_clrsetbits(port, UART1_IOBASE, 0xfe, iobase >> 2);
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sio1007_clrsetbits(port, UART_IRQ, 0xf0, irq << 4);
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} else {
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sio1007_clrsetbits(port, DEV_POWER_CTRL, 0, UART2_POWER_ON);
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sio1007_clrsetbits(port, UART2_IOBASE, 0xfe, iobase >> 2);
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sio1007_clrsetbits(port, UART_IRQ, 0x0f, irq);
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}
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/* exit configuration state */
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outb(0xaa, port);
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}
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void sio1007_enable_runtime(int port, int iobase)
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{
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/* enter configuration state */
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outb(0x55, port);
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/* set i/o base for the runtime register block */
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sio1007_clrsetbits(port, RTR_IOBASE_LOW, 0, iobase >> 4);
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sio1007_clrsetbits(port, RTR_IOBASE_HIGH, 0, iobase >> 12);
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/* turn on address decoding for this block */
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sio1007_clrsetbits(port, DEV_ACTIVATE, 0, RTR_EN);
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/* exit configuration state */
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outb(0xaa, port);
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}
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void sio1007_gpio_config(int port, int gpio, int dir, int pol, int type)
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{
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int reg = GPIO0_DIR;
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if (gpio < 0 || gpio > SIO1007_GPIO_NUM)
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return;
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if (gpio >= GPIO_NUM_PER_GROUP) {
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reg = GPIO1_DIR;
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gpio -= GPIO_NUM_PER_GROUP;
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}
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/* enter configuration state */
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outb(0x55, port);
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/* set gpio pin direction, polority and type */
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sio1007_clrsetbits(port, reg, 1 << gpio, dir << gpio);
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sio1007_clrsetbits(port, reg + 1, 1 << gpio, pol << gpio);
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sio1007_clrsetbits(port, reg + 2, 1 << gpio, type << gpio);
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/* exit configuration state */
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outb(0xaa, port);
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}
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int sio1007_gpio_get_value(int port, int gpio)
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{
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int reg = GPIO0_DATA;
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int val;
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if (gpio < 0 || gpio > SIO1007_GPIO_NUM)
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return -EINVAL;
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if (gpio >= GPIO_NUM_PER_GROUP) {
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reg = GPIO1_DATA;
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gpio -= GPIO_NUM_PER_GROUP;
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}
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val = inb(port + reg);
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if (val & (1 << gpio))
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return 1;
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else
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return 0;
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}
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void sio1007_gpio_set_value(int port, int gpio, int val)
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{
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int reg = GPIO0_DATA;
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u8 data;
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if (gpio < 0 || gpio > SIO1007_GPIO_NUM)
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return;
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if (gpio >= GPIO_NUM_PER_GROUP) {
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reg = GPIO1_DATA;
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gpio -= GPIO_NUM_PER_GROUP;
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}
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data = inb(port + reg);
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data &= ~(1 << gpio);
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data |= (val << gpio);
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outb(data, port + reg);
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}
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