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/* SPDX-License-Identifier: GPL-2.0+ */
/* Synopsys DesignWare 8250 library header file. */
#ifndef _SERIAL_8250_DWLIB_H_
#define _SERIAL_8250_DWLIB_H_
#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/build_bug.h>
#include <linux/io.h>
#include <linux/types.h>
#include "8250.h"
/* Offsets for the DesignWare specific registers */
#define DW_UART_USR 0x1f /* UART Status Register */
#define DW_UART_DMASA 0xa8 /* DMA Software Ack */
#define DW_UART_TCR 0xac /* Transceiver Control Register (RS485) */
#define DW_UART_DE_EN 0xb0 /* Driver Output Enable Register */
#define DW_UART_RE_EN 0xb4 /* Receiver Output Enable Register */
#define DW_UART_DLF 0xc0 /* Divisor Latch Fraction Register */
#define DW_UART_RAR 0xc4 /* Receive Address Register */
#define DW_UART_TAR 0xc8 /* Transmit Address Register */
#define DW_UART_LCR_EXT 0xcc /* Line Extended Control Register */
#define DW_UART_CPR 0xf4 /* Component Parameter Register */
#define DW_UART_UCV 0xf8 /* UART Component Version */
/* Interrupt ID Register bits */
#define DW_UART_IIR_IID GENMASK(3, 0)
/* Modem Control Register bits */
#define DW_UART_MCR_SIRE BIT(6)
/* Line Status Register bits */
#define DW_UART_LSR_ADDR_RCVD BIT(8)
/* UART Status Register bits */
#define DW_UART_USR_BUSY BIT(0)
/* Transceiver Control Register bits */
#define DW_UART_TCR_RS485_EN BIT(0)
#define DW_UART_TCR_RE_POL BIT(1)
#define DW_UART_TCR_DE_POL BIT(2)
#define DW_UART_TCR_XFER_MODE GENMASK(4, 3)
#define DW_UART_TCR_XFER_MODE_DE_DURING_RE FIELD_PREP(DW_UART_TCR_XFER_MODE, 0)
#define DW_UART_TCR_XFER_MODE_SW_DE_OR_RE FIELD_PREP(DW_UART_TCR_XFER_MODE, 1)
#define DW_UART_TCR_XFER_MODE_DE_OR_RE FIELD_PREP(DW_UART_TCR_XFER_MODE, 2)
/* Receive / Transmit Address Register bits */
#define DW_UART_ADDR_MASK GENMASK(7, 0)
/* Line Extended Control Register bits */
#define DW_UART_LCR_EXT_DLS_E BIT(0)
#define DW_UART_LCR_EXT_ADDR_MATCH BIT(1)
#define DW_UART_LCR_EXT_SEND_ADDR BIT(2)
#define DW_UART_LCR_EXT_TRANSMIT_MODE BIT(3)
/* Component Parameter Register bits */
#define DW_UART_CPR_ABP_DATA_WIDTH GENMASK(1, 0)
#define DW_UART_CPR_AFCE_MODE BIT(4)
#define DW_UART_CPR_THRE_MODE BIT(5)
#define DW_UART_CPR_SIR_MODE BIT(6)
#define DW_UART_CPR_SIR_LP_MODE BIT(7)
#define DW_UART_CPR_ADDITIONAL_FEATURES BIT(8)
#define DW_UART_CPR_FIFO_ACCESS BIT(9)
#define DW_UART_CPR_FIFO_STAT BIT(10)
#define DW_UART_CPR_SHADOW BIT(11)
#define DW_UART_CPR_ENCODED_PARMS BIT(12)
#define DW_UART_CPR_DMA_EXTRA BIT(13)
#define DW_UART_CPR_FIFO_MODE GENMASK(23, 16)
/* Helpers for FIFO size calculation */
#define DW_UART_CPR_FIFO_SIZE(a) (FIELD_GET(DW_UART_CPR_FIFO_MODE, (a)) * 16)
#define DW_UART_CPR_FIFO_MODE_FROM_SIZE(size) \
(FIELD_PREP_CONST(DW_UART_CPR_FIFO_MODE, \
BUILD_BUG_ON_ZERO((size) > 2048) + \
BUILD_BUG_ON_ZERO((size) % 16) + \
((size) / 16)))
struct dw8250_port_data {
/* Port properties */
int line;
/* DMA operations */
struct uart_8250_dma dma;
/* Hardware configuration */
u32 cpr_value;
u8 dlf_size;
/* RS485 variables */
bool hw_rs485_support;
};
void dw8250_do_set_termios(struct uart_port *p, struct ktermios *termios, const struct ktermios *old);
void dw8250_setup_port(struct uart_port *p);
static inline u32 dw8250_readl_ext(struct uart_port *p, int offset)
{
if (p->iotype == UPIO_MEM32BE)
return ioread32be(p->membase + offset);
return readl(p->membase + offset);
}
static inline void dw8250_writel_ext(struct uart_port *p, int offset, u32 reg)
{
if (p->iotype == UPIO_MEM32BE)
iowrite32be(reg, p->membase + offset);
else
writel(reg, p->membase + offset);
}
#endif /* _SERIAL_8250_DWLIB_H_ */
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