/* SPDX-License-Identifier: GPL-2.0+ */ /* * Driver for 8250/16550-type serial ports * * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. * * Copyright (C) 2001 Russell King. */ #include <linux/bits.h> #include <linux/serial_8250.h> #include <linux/serial_core.h> #include <linux/dmaengine.h> #include "../serial_mctrl_gpio.h" struct uart_8250_dma { … }; struct old_serial_port { … }; struct serial8250_config { … }; #define UART_CAP_FIFO … #define UART_CAP_EFR … #define UART_CAP_SLEEP … #define UART_CAP_AFE … #define UART_CAP_UUE … #define UART_CAP_RTOIE … #define UART_CAP_HFIFO … #define UART_CAP_RPM … #define UART_CAP_IRDA … #define UART_CAP_MINI … #define UART_CAP_NOTEMT … #define UART_BUG_QUOT … #define UART_BUG_TXEN … #define UART_BUG_NOMSR … #define UART_BUG_THRE … #define UART_BUG_TXRACE … /* Module parameters */ #define UART_NR … extern unsigned int nr_uarts; #ifdef CONFIG_SERIAL_8250_SHARE_IRQ #define SERIAL8250_SHARE_IRQS … #else #define SERIAL8250_SHARE_IRQS … #endif extern unsigned int share_irqs; extern unsigned int skip_txen_test; #define SERIAL8250_PORT_FLAGS(_base, _irq, _flags) … #define SERIAL8250_PORT(_base, _irq) … extern struct uart_driver serial8250_reg; void serial8250_register_ports(struct uart_driver *drv, struct device *dev); /* Legacy ISA bus related APIs */ serial8250_isa_config_fn; extern serial8250_isa_config_fn serial8250_isa_config; void serial8250_isa_init_ports(void); extern struct platform_device *serial8250_isa_devs; extern const struct uart_ops *univ8250_port_base_ops; extern struct uart_ops univ8250_port_ops; static inline int serial_in(struct uart_8250_port *up, int offset) { … } static inline void serial_out(struct uart_8250_port *up, int offset, int value) { … } /** * serial_lsr_in - Read LSR register and preserve flags across reads * @up: uart 8250 port * * Read LSR register and handle saving non-preserved flags across reads. * The flags that are not preserved across reads are stored into * up->lsr_saved_flags. * * Returns LSR value or'ed with the preserved flags (if any). */ static inline u16 serial_lsr_in(struct uart_8250_port *up) { … } /* * For the 16C950 */ static void serial_icr_write(struct uart_8250_port *up, int offset, int value) { … } static unsigned int __maybe_unused serial_icr_read(struct uart_8250_port *up, int offset) { … } void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p); static inline u32 serial_dl_read(struct uart_8250_port *up) { … } static inline void serial_dl_write(struct uart_8250_port *up, u32 value) { … } static inline bool serial8250_set_THRI(struct uart_8250_port *up) { … } static inline bool serial8250_clear_THRI(struct uart_8250_port *up) { … } struct uart_8250_port *serial8250_setup_port(int index); struct uart_8250_port *serial8250_get_port(int line); void serial8250_rpm_get(struct uart_8250_port *p); void serial8250_rpm_put(struct uart_8250_port *p); void serial8250_rpm_get_tx(struct uart_8250_port *p); void serial8250_rpm_put_tx(struct uart_8250_port *p); int serial8250_em485_config(struct uart_port *port, struct ktermios *termios, struct serial_rs485 *rs485); void serial8250_em485_start_tx(struct uart_8250_port *p); void serial8250_em485_stop_tx(struct uart_8250_port *p); void serial8250_em485_destroy(struct uart_8250_port *p); extern struct serial_rs485 serial8250_em485_supported; /* MCR <-> TIOCM conversion */ static inline int serial8250_TIOCM_to_MCR(int tiocm) { … } static inline int serial8250_MCR_to_TIOCM(int mcr) { … } /* MSR <-> TIOCM conversion */ static inline int serial8250_MSR_to_TIOCM(int msr) { … } static inline void serial8250_out_MCR(struct uart_8250_port *up, int value) { … } static inline int serial8250_in_MCR(struct uart_8250_port *up) { … } #ifdef CONFIG_SERIAL_8250_PNP int serial8250_pnp_init(void); void serial8250_pnp_exit(void); #else static inline int serial8250_pnp_init(void) { return 0; } static inline void serial8250_pnp_exit(void) { } #endif #ifdef CONFIG_SERIAL_8250_RSA void univ8250_rsa_support(struct uart_ops *ops); #else static inline void univ8250_rsa_support(struct uart_ops *ops) { } #endif #ifdef CONFIG_SERIAL_8250_FINTEK int fintek_8250_probe(struct uart_8250_port *uart); #else static inline int fintek_8250_probe(struct uart_8250_port *uart) { return 0; } #endif #ifdef CONFIG_ARCH_OMAP1 #include <linux/soc/ti/omap1-soc.h> static inline int is_omap1_8250(struct uart_8250_port *pt) { int res; switch (pt->port.mapbase) { case OMAP1_UART1_BASE: case OMAP1_UART2_BASE: case OMAP1_UART3_BASE: res = 1; break; default: res = 0; break; } return res; } static inline int is_omap1510_8250(struct uart_8250_port *pt) { if (!cpu_is_omap1510()) return 0; return is_omap1_8250(pt); } #else static inline int is_omap1_8250(struct uart_8250_port *pt) { … } static inline int is_omap1510_8250(struct uart_8250_port *pt) { … } #endif #ifdef CONFIG_SERIAL_8250_DMA extern int serial8250_tx_dma(struct uart_8250_port *); extern int serial8250_rx_dma(struct uart_8250_port *); extern void serial8250_rx_dma_flush(struct uart_8250_port *); extern int serial8250_request_dma(struct uart_8250_port *); extern void serial8250_release_dma(struct uart_8250_port *); static inline void serial8250_do_prepare_tx_dma(struct uart_8250_port *p) { … } static inline void serial8250_do_prepare_rx_dma(struct uart_8250_port *p) { … } static inline bool serial8250_tx_dma_running(struct uart_8250_port *p) { … } #else static inline int serial8250_tx_dma(struct uart_8250_port *p) { return -1; } static inline int serial8250_rx_dma(struct uart_8250_port *p) { return -1; } static inline void serial8250_rx_dma_flush(struct uart_8250_port *p) { } static inline int serial8250_request_dma(struct uart_8250_port *p) { return -1; } static inline void serial8250_release_dma(struct uart_8250_port *p) { } static inline bool serial8250_tx_dma_running(struct uart_8250_port *p) { return false; } #endif static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) { … } static inline int serial_index(struct uart_port *port) { … }
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