drivers/tty/serial/sirfsoc_uart.h - maze/linux - Git at Google

 /*
  * 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
	/*
	* 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