v4.19.13 snapshot.
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
new file mode 100644
index 0000000..18e2142
--- /dev/null
+++ b/include/linux/serial_8250.h
@@ -0,0 +1,182 @@
+/*
+ * linux/include/linux/serial_8250.h
+ *
+ * Copyright (C) 2004 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#ifndef _LINUX_SERIAL_8250_H
+#define _LINUX_SERIAL_8250_H
+
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/platform_device.h>
+
+/*
+ * This is the platform device platform_data structure
+ */
+struct plat_serial8250_port {
+ unsigned long iobase; /* io base address */
+ void __iomem *membase; /* ioremap cookie or NULL */
+ resource_size_t mapbase; /* resource base */
+ unsigned int irq; /* interrupt number */
+ unsigned long irqflags; /* request_irq flags */
+ unsigned int uartclk; /* UART clock rate */
+ void *private_data;
+ unsigned char regshift; /* register shift */
+ unsigned char iotype; /* UPIO_* */
+ unsigned char hub6;
+ upf_t flags; /* UPF_* flags */
+ unsigned int type; /* If UPF_FIXED_TYPE */
+ unsigned int (*serial_in)(struct uart_port *, int);
+ void (*serial_out)(struct uart_port *, int, int);
+ void (*set_termios)(struct uart_port *,
+ struct ktermios *new,
+ struct ktermios *old);
+ void (*set_ldisc)(struct uart_port *,
+ struct ktermios *);
+ unsigned int (*get_mctrl)(struct uart_port *);
+ int (*handle_irq)(struct uart_port *);
+ void (*pm)(struct uart_port *, unsigned int state,
+ unsigned old);
+ void (*handle_break)(struct uart_port *);
+};
+
+/*
+ * Allocate 8250 platform device IDs. Nothing is implied by
+ * the numbering here, except for the legacy entry being -1.
+ */
+enum {
+ PLAT8250_DEV_LEGACY = -1,
+ PLAT8250_DEV_PLATFORM,
+ PLAT8250_DEV_PLATFORM1,
+ PLAT8250_DEV_PLATFORM2,
+ PLAT8250_DEV_FOURPORT,
+ PLAT8250_DEV_ACCENT,
+ PLAT8250_DEV_BOCA,
+ PLAT8250_DEV_EXAR_ST16C554,
+ PLAT8250_DEV_HUB6,
+ PLAT8250_DEV_AU1X00,
+ PLAT8250_DEV_SM501,
+};
+
+struct uart_8250_dma;
+struct uart_8250_port;
+
+/**
+ * 8250 core driver operations
+ *
+ * @setup_irq() Setup irq handling. The universal 8250 driver links this
+ * port to the irq chain. Other drivers may @request_irq().
+ * @release_irq() Undo irq handling. The universal 8250 driver unlinks
+ * the port from the irq chain.
+ */
+struct uart_8250_ops {
+ int (*setup_irq)(struct uart_8250_port *);
+ void (*release_irq)(struct uart_8250_port *);
+};
+
+struct uart_8250_em485 {
+ struct hrtimer start_tx_timer; /* "rs485 start tx" timer */
+ struct hrtimer stop_tx_timer; /* "rs485 stop tx" timer */
+ struct hrtimer *active_timer; /* pointer to active timer */
+ struct uart_8250_port *port; /* for hrtimer callbacks */
+};
+
+/*
+ * This should be used by drivers which want to register
+ * their own 8250 ports without registering their own
+ * platform device. Using these will make your driver
+ * dependent on the 8250 driver.
+ */
+
+struct uart_8250_port {
+ struct uart_port port;
+ struct timer_list timer; /* "no irq" timer */
+ struct list_head list; /* ports on this IRQ */
+ u32 capabilities; /* port capabilities */
+ unsigned short bugs; /* port bugs */
+ bool fifo_bug; /* min RX trigger if enabled */
+ unsigned int tx_loadsz; /* transmit fifo load size */
+ unsigned char acr;
+ unsigned char fcr;
+ unsigned char ier;
+ unsigned char lcr;
+ unsigned char mcr;
+ unsigned char mcr_mask; /* mask of user bits */
+ unsigned char mcr_force; /* mask of forced bits */
+ unsigned char cur_iotype; /* Running I/O type */
+ unsigned int rpm_tx_active;
+ unsigned char canary; /* non-zero during system sleep
+ * if no_console_suspend
+ */
+ unsigned char probe;
+#define UART_PROBE_RSA (1 << 0)
+
+ /*
+ * Some bits in registers are cleared on a read, so they must
+ * be saved whenever the register is read but the bits will not
+ * be immediately processed.
+ */
+#define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
+ unsigned char lsr_saved_flags;
+#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
+ unsigned char msr_saved_flags;
+
+ struct uart_8250_dma *dma;
+ const struct uart_8250_ops *ops;
+
+ /* 8250 specific callbacks */
+ int (*dl_read)(struct uart_8250_port *);
+ void (*dl_write)(struct uart_8250_port *, int);
+
+ struct uart_8250_em485 *em485;
+};
+
+static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up)
+{
+ return container_of(up, struct uart_8250_port, port);
+}
+
+int serial8250_register_8250_port(struct uart_8250_port *);
+void serial8250_unregister_port(int line);
+void serial8250_suspend_port(int line);
+void serial8250_resume_port(int line);
+
+extern int early_serial_setup(struct uart_port *port);
+
+extern int early_serial8250_setup(struct earlycon_device *device,
+ const char *options);
+extern void serial8250_do_set_termios(struct uart_port *port,
+ struct ktermios *termios, struct ktermios *old);
+extern void serial8250_do_set_ldisc(struct uart_port *port,
+ struct ktermios *termios);
+extern unsigned int serial8250_do_get_mctrl(struct uart_port *port);
+extern int serial8250_do_startup(struct uart_port *port);
+extern void serial8250_do_shutdown(struct uart_port *port);
+extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
+ unsigned int oldstate);
+extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
+extern void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
+ unsigned int quot,
+ unsigned int quot_frac);
+extern int fsl8250_handle_irq(struct uart_port *port);
+int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
+unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
+void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr);
+void serial8250_tx_chars(struct uart_8250_port *up);
+unsigned int serial8250_modem_status(struct uart_8250_port *up);
+void serial8250_init_port(struct uart_8250_port *up);
+void serial8250_set_defaults(struct uart_8250_port *up);
+void serial8250_console_write(struct uart_8250_port *up, const char *s,
+ unsigned int count);
+int serial8250_console_setup(struct uart_port *port, char *options, bool probe);
+
+extern void serial8250_set_isa_configurator(void (*v)
+ (int port, struct uart_port *up,
+ u32 *capabilities));
+
+#endif