/*
* Drivers for CSR SiRFprimaII onboard UARTs.
*
* Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
*
* Licensed under GPLv2 or later.
*/
#include <linux/bitops.h>
/* UART Register Offset Define */
#define SIRFUART_LINE_CTRL 0x0040
#define SIRFUART_TX_RX_EN 0x004c
#define SIRFUART_DIVISOR 0x0050
#define SIRFUART_INT_EN 0x0054
#define SIRFUART_INT_STATUS 0x0058
#define SIRFUART_TX_DMA_IO_CTRL 0x0100
#define SIRFUART_TX_DMA_IO_LEN 0x0104
#define SIRFUART_TX_FIFO_CTRL 0x0108
#define SIRFUART_TX_FIFO_LEVEL_CHK 0x010C
#define SIRFUART_TX_FIFO_OP 0x0110
#define SIRFUART_TX_FIFO_STATUS 0x0114
#define SIRFUART_TX_FIFO_DATA 0x0118
#define SIRFUART_RX_DMA_IO_CTRL 0x0120
#define SIRFUART_RX_DMA_IO_LEN 0x0124
#define SIRFUART_RX_FIFO_CTRL 0x0128
#define SIRFUART_RX_FIFO_LEVEL_CHK 0x012C
#define SIRFUART_RX_FIFO_OP 0x0130
#define SIRFUART_RX_FIFO_STATUS 0x0134
#define SIRFUART_RX_FIFO_DATA 0x0138
#define SIRFUART_AFC_CTRL 0x0140
#define SIRFUART_SWH_DMA_IO 0x0148
/* UART Line Control Register */
#define SIRFUART_DATA_BIT_LEN_MASK 0x3
#define SIRFUART_DATA_BIT_LEN_5 BIT(0)
#define SIRFUART_DATA_BIT_LEN_6 1
#define SIRFUART_DATA_BIT_LEN_7 2
#define SIRFUART_DATA_BIT_LEN_8 3
#define SIRFUART_STOP_BIT_LEN_1 0
#define SIRFUART_STOP_BIT_LEN_2 BIT(2)
#define SIRFUART_PARITY_EN BIT(3)
#define SIRFUART_EVEN_BIT BIT(4)
#define SIRFUART_STICK_BIT_MASK (7 << 3)
#define SIRFUART_STICK_BIT_NONE (0 << 3)
#define SIRFUART_STICK_BIT_EVEN BIT(3)
#define SIRFUART_STICK_BIT_ODD (3 << 3)
#define SIRFUART_STICK_BIT_MARK (5 << 3)
#define SIRFUART_STICK_BIT_SPACE (7 << 3)
#define SIRFUART_SET_BREAK BIT(6)
#define SIRFUART_LOOP_BACK BIT(7)
#define SIRFUART_PARITY_MASK (7 << 3)
#define SIRFUART_DUMMY_READ BIT(16)
#define SIRFSOC_UART_RX_TIMEOUT(br, to) (((br) * (((to) + 999) / 1000)) / 1000)
#define SIRFUART_RECV_TIMEOUT_MASK (0xFFFF << 16)
#define SIRFUART_RECV_TIMEOUT(x) (((x) & 0xFFFF) << 16)
/* UART Auto Flow Control */
#define SIRFUART_AFC_RX_THD_MASK 0x000000FF
#define SIRFUART_AFC_RX_EN BIT(8)
#define SIRFUART_AFC_TX_EN BIT(9)
#define SIRFUART_CTS_CTRL BIT(10)
#define SIRFUART_RTS_CTRL BIT(11)
#define SIRFUART_CTS_IN_STATUS BIT(12)
#define SIRFUART_RTS_OUT_STATUS BIT(13)
/* UART Interrupt Enable Register */
#define SIRFUART_RX_DONE_INT BIT(0)
#define SIRFUART_TX_DONE_INT BIT(1)
#define SIRFUART_RX_OFLOW_INT BIT(2)
#define SIRFUART_TX_ALLOUT_INT BIT(3)
#define SIRFUART_RX_IO_DMA_INT BIT(4)
#define SIRFUART_TX_IO_DMA_INT BIT(5)
#define SIRFUART_RXFIFO_FULL_INT BIT(6)
#define SIRFUART_TXFIFO_EMPTY_INT BIT(7)
#define SIRFUART_RXFIFO_THD_INT BIT(8)
#define SIRFUART_TXFIFO_THD_INT BIT(9)
#define SIRFUART_FRM_ERR_INT BIT(10)
#define SIRFUART_RXD_BREAK_INT BIT(11)
#define SIRFUART_RX_TIMEOUT_INT BIT(12)
#define SIRFUART_PARITY_ERR_INT BIT(13)
#define SIRFUART_CTS_INT_EN BIT(14)
#define SIRFUART_RTS_INT_EN BIT(15)
/* UART Interrupt Status Register */
#define SIRFUART_RX_DONE BIT(0)
#define SIRFUART_TX_DONE BIT(1)
#define SIRFUART_RX_OFLOW BIT(2)
#define SIRFUART_TX_ALL_EMPTY BIT(3)
#define SIRFUART_DMA_IO_RX_DONE BIT(4)
#define SIRFUART_DMA_IO_TX_DONE BIT(5)
#define SIRFUART_RXFIFO_FULL BIT(6)
#define SIRFUART_TXFIFO_EMPTY BIT(7)
#define SIRFUART_RXFIFO_THD_REACH BIT(8)
#define SIRFUART_TXFIFO_THD_REACH BIT(9)
#define SIRFUART_FRM_ERR BIT(10)
#define SIRFUART_RXD_BREAK BIT(11)
#define SIRFUART_RX_TIMEOUT BIT(12)
#define SIRFUART_PARITY_ERR BIT(13)
#define SIRFUART_CTS_CHANGE BIT(14)
#define SIRFUART_RTS_CHANGE BIT(15)
#define SIRFUART_PLUG_IN BIT(16)
#define SIRFUART_ERR_INT_STAT \
(SIRFUART_RX_OFLOW | \
SIRFUART_FRM_ERR | \
SIRFUART_RXD_BREAK | \
SIRFUART_PARITY_ERR)
#define SIRFUART_ERR_INT_EN \
(SIRFUART_RX_OFLOW_INT | \
SIRFUART_FRM_ERR_INT | \
SIRFUART_RXD_BREAK_INT | \
SIRFUART_PARITY_ERR_INT)
#define SIRFUART_TX_INT_EN SIRFUART_TXFIFO_EMPTY_INT
#define SIRFUART_RX_IO_INT_EN \
(SIRFUART_RX_TIMEOUT_INT | \
SIRFUART_RXFIFO_THD_INT | \
SIRFUART_RXFIFO_FULL_INT | \
SIRFUART_ERR_INT_EN)
/* UART FIFO Register */
#define SIRFUART_TX_FIFO_STOP 0x0
#define SIRFUART_TX_FIFO_RESET 0x1
#define SIRFUART_TX_FIFO_START 0x2
#define SIRFUART_RX_FIFO_STOP 0x0
#define SIRFUART_RX_FIFO_RESET 0x1
#define SIRFUART_RX_FIFO_START 0x2
#define SIRFUART_TX_MODE_DMA 0
#define SIRFUART_TX_MODE_IO 1
#define SIRFUART_RX_MODE_DMA 0
#define SIRFUART_RX_MODE_IO 1
#define SIRFUART_RX_EN 0x1
#define SIRFUART_TX_EN 0x2
/* Generic Definitions */
#define SIRFSOC_UART_NAME "ttySiRF"
#define SIRFSOC_UART_MAJOR 0
#define SIRFSOC_UART_MINOR 0
#define SIRFUART_PORT_NAME "sirfsoc-uart"
#define SIRFUART_MAP_SIZE 0x200
#define SIRFSOC_UART_NR 5
#define SIRFSOC_PORT_TYPE 0xa5
/* Baud Rate Calculation */
#define SIRF_MIN_SAMPLE_DIV 0xf
#define SIRF_MAX_SAMPLE_DIV 0x3f
#define SIRF_IOCLK_DIV_MAX 0xffff
#define SIRF_SAMPLE_DIV_SHIFT 16
#define SIRF_IOCLK_DIV_MASK 0xffff
#define SIRF_SAMPLE_DIV_MASK 0x3f0000
#define SIRF_BAUD_RATE_SUPPORT_NR 18
/* For Fast Baud Rate Calculation */
struct sirfsoc_baudrate_to_regv {
unsigned int baud_rate;
unsigned int reg_val;
};
struct sirfsoc_uart_port {
unsigned char hw_flow_ctrl;
unsigned char ms_enabled;
struct uart_port port;
struct pinctrl *p;
struct clk *clk;
};
/* Hardware Flow Control */
#define SIRFUART_AFC_CTRL_RX_THD 0x70
/* Register Access Control */
#define portaddr(port, reg) ((port)->membase + (reg))
#define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
#define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
#define wr_regb(port, reg, val) __raw_writeb(val, portaddr(port, reg))
#define wr_regl(port, reg, val) __raw_writel(val, portaddr(port, reg))
/* UART Port Mask */
#define SIRFUART_FIFOLEVEL_MASK(port) ((port->line == 1) ? (0x1f) : (0x7f))
#define SIRFUART_FIFOFULL_MASK(port) ((port->line == 1) ? (0x20) : (0x80))
#define SIRFUART_FIFOEMPTY_MASK(port) ((port->line == 1) ? (0x40) : (0x100))
/* I/O Mode */
#define SIRFSOC_UART_IO_RX_MAX_CNT 256
#define SIRFSOC_UART_IO_TX_REASONABLE_CNT 6