| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| /* Pre-RAM driver for the SMSC KBC1100 Super I/O chip */ |
| |
| #include <arch/io.h> |
| #include <device/pnp_ops.h> |
| #include <stdint.h> |
| |
| #include "sio1036.h" |
| |
| static inline void sio1036_enter_conf_state(pnp_devfn_t dev) |
| { |
| u8 port = dev >> 8; |
| outb(0x55, port); |
| } |
| |
| static inline void sio1036_exit_conf_state(pnp_devfn_t dev) |
| { |
| u8 port = dev >> 8; |
| outb(0xaa, port); |
| } |
| |
| /* Detect SMSC SIO1036 LPC Debug Card status */ |
| static u8 detect_sio1036_chip(unsigned int port) |
| { |
| pnp_devfn_t dev = PNP_DEV(port, SIO1036_SP1); |
| u8 data; |
| |
| sio1036_enter_conf_state(dev); |
| data = pnp_read_config(dev, 0x0D); |
| sio1036_exit_conf_state(dev); |
| |
| /* Detect SMSC SIO1036 chip */ |
| if (data == 0x82) { |
| /* Found SMSC SIO1036 chip */ |
| return 0; |
| } else { |
| return 1; |
| }; |
| } |
| |
| void sio1036_enable_serial(pnp_devfn_t dev, u16 iobase) |
| { |
| unsigned int port = dev >> 8; |
| |
| if (detect_sio1036_chip(port) != 0) |
| return; |
| |
| sio1036_enter_conf_state(dev); |
| |
| /* Enable SMSC UART 0 */ |
| /* Valid configuration cycle */ |
| pnp_write_config(dev, 0x00, 0x28); |
| |
| /* PP power/mode/cr lock */ |
| pnp_write_config(dev, 0x01, 0x98 | LPT_POWER_DOWN); |
| pnp_write_config(dev, 0x02, 0x08 | UART_POWER_DOWN); |
| |
| /*Auto power management*/ |
| pnp_write_config(dev, 0x07, 0x00); |
| |
| /*ECP FIFO threhod */ |
| pnp_write_config(dev, 0x0A, 0x00 | IR_OUTPUT_MUX); |
| |
| /*GPIO direction register 2 */ |
| pnp_write_config(dev, 0x033, 0x00); |
| |
| /*UART Mode */ |
| pnp_write_config(dev, 0x0C, 0x02); |
| |
| /* GPIO polarity regisgter 2 */ |
| pnp_write_config(dev, 0x034, 0x00); |
| |
| /* Enable SMSC UART 0 */ |
| /*Set base io address */ |
| pnp_write_config(dev, 0x25, (u8)(iobase >> 2)); |
| |
| /* Set UART IRQ onto 0x04 */ |
| pnp_write_config(dev, 0x28, 0x04); |
| |
| sio1036_exit_conf_state(dev); |
| } |