Linux Kernel: drivers/tty/serial/sirfsoc

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 /*
  * 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             3
 #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;
 };
 
 /* 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