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// 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);
}
static inline bool serial8250_set_THRI(struct uart_8250_port *up)
{
if (up->ier & UART_IER_THRI)
return false;
up->ier |= UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
return true;
}
static inline bool serial8250_clear_THRI(struct uart_8250_port *up)
{
if (!(up->ier & UART_IER_THRI))
return false;
up->ier &= ~UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
return true;
}
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;
}
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