diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250.h')
| -rw-r--r-- | drivers/tty/serial/8250/8250.h | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h new file mode 100644 index 000000000..ebfb0bd5b --- /dev/null +++ b/drivers/tty/serial/8250/8250.h @@ -0,0 +1,257 @@ +// 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/serial_8250.h> +#include <linux/serial_reg.h> +#include <linux/dmaengine.h> + +struct uart_8250_dma { + int (*tx_dma)(struct uart_8250_port *p); + int (*rx_dma)(struct uart_8250_port *p); + + /* Filter function */ + dma_filter_fn fn; + /* Parameter to the filter function */ + void *rx_param; + void *tx_param; + + struct dma_slave_config rxconf; + struct dma_slave_config txconf; + + struct dma_chan *rxchan; + struct dma_chan *txchan; + + /* Device address base for DMA operations */ + phys_addr_t rx_dma_addr; + phys_addr_t tx_dma_addr; + + /* DMA address of the buffer in memory */ + dma_addr_t rx_addr; + dma_addr_t tx_addr; + + dma_cookie_t rx_cookie; + dma_cookie_t tx_cookie; + + void *rx_buf; + + size_t rx_size; + size_t tx_size; + + unsigned char tx_running; + unsigned char tx_err; + unsigned char rx_running; +}; + +struct old_serial_port { + unsigned int uart; + unsigned int baud_base; + unsigned int port; + unsigned int irq; + upf_t flags; + unsigned char io_type; + unsigned char __iomem *iomem_base; + unsigned short iomem_reg_shift; +}; + +struct serial8250_config { + const char *name; + unsigned short fifo_size; + unsigned short tx_loadsz; + unsigned char fcr; + unsigned char rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE]; + unsigned int flags; +}; + +#define UART_CAP_FIFO (1 << 8) /* UART has FIFO */ +#define UART_CAP_EFR (1 << 9) /* UART has EFR */ +#define UART_CAP_SLEEP (1 << 10) /* UART has IER sleep */ +#define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */ +#define UART_CAP_UUE (1 << 12) /* UART needs IER bit 6 set (Xscale) */ +#define UART_CAP_RTOIE (1 << 13) /* UART needs IER bit 4 set (Xscale, Tegra) */ +#define UART_CAP_HFIFO (1 << 14) /* UART has a "hidden" FIFO */ +#define UART_CAP_RPM (1 << 15) /* Runtime PM is active while idle */ +#define UART_CAP_IRDA (1 << 16) /* UART supports IrDA line discipline */ +#define UART_CAP_MINI (1 << 17) /* Mini UART on BCM283X family lacks: + * STOP PARITY EPAR SPAR WLEN5 WLEN6 + */ + +#define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */ +#define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */ +#define UART_BUG_NOMSR (1 << 2) /* UART has buggy MSR status bits (Au1x00) */ +#define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */ +#define UART_BUG_PARITY (1 << 4) /* UART mishandles parity if FIFO enabled */ + + +#ifdef CONFIG_SERIAL_8250_SHARE_IRQ +#define SERIAL8250_SHARE_IRQS 1 +#else +#define SERIAL8250_SHARE_IRQS 0 +#endif + +#define SERIAL8250_PORT_FLAGS(_base, _irq, _flags) \ + { \ + .iobase = _base, \ + .irq = _irq, \ + .uartclk = 1843200, \ + .iotype = UPIO_PORT, \ + .flags = UPF_BOOT_AUTOCONF | (_flags), \ + } + +#define SERIAL8250_PORT(_base, _irq) SERIAL8250_PORT_FLAGS(_base, _irq, 0) + + +static inline int serial_in(struct uart_8250_port *up, int offset) +{ + return up->port.serial_in(&up->port, offset); +} + +static inline void serial_out(struct uart_8250_port *up, int offset, int value) +{ + up->port.serial_out(&up->port, offset, value); +} + +void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p); + +static inline int serial_dl_read(struct uart_8250_port *up) +{ + return up->dl_read(up); +} + +static inline void serial_dl_write(struct uart_8250_port *up, int value) +{ + up->dl_write(up, value); +} + +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_init(struct uart_8250_port *p); +void serial8250_em485_destroy(struct uart_8250_port *p); + +static inline void serial8250_out_MCR(struct uart_8250_port *up, int value) +{ + serial_out(up, UART_MCR, value); +} + +static inline int serial8250_in_MCR(struct uart_8250_port *up) +{ + return serial_in(up, UART_MCR); +} + +#if defined(__alpha__) && !defined(CONFIG_PCI) +/* + * Digital did something really horribly wrong with the OUT1 and OUT2 + * lines on at least some ALPHA's. The failure mode is that if either + * is cleared, the machine locks up with endless interrupts. + */ +#define ALPHA_KLUDGE_MCR (UART_MCR_OUT2 | UART_MCR_OUT1) +#else +#define ALPHA_KLUDGE_MCR 0 +#endif + +#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_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 +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) +{ + return 0; +} +static inline int is_omap1510_8250(struct uart_8250_port *pt) +{ + return 0; +} +#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 *); +#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) { } +#endif + +static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) +{ + unsigned char status; + + status = serial_in(up, 0x04); /* EXCR2 */ +#define PRESL(x) ((x) & 0x30) + if (PRESL(status) == 0x10) { + /* already in high speed mode */ + return 0; + } else { + status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ + status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ + serial_out(up, 0x04, status); + } + return 1; +} + +static inline int serial_index(struct uart_port *port) +{ + return port->minor - 64; +} |