drivers/tty/serial/sirfsoc_uart.h

   1 /*
   2  * Drivers for CSR SiRFprimaII onboard UARTs.
   3  *
   4  * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
   5  *
   6  * Licensed under GPLv2 or later.
   7  */
   8 #include <linux/bitops.h>
   9
  10 /* UART Register Offset Define */
  11 #define SIRFUART_LINE_CTRL                      0x0040
  12 #define SIRFUART_TX_RX_EN                       0x004c
  13 #define SIRFUART_DIVISOR                        0x0050
  14 #define SIRFUART_INT_EN                         0x0054
  15 #define SIRFUART_INT_STATUS                     0x0058
  16 #define SIRFUART_TX_DMA_IO_CTRL                 0x0100
  17 #define SIRFUART_TX_DMA_IO_LEN                  0x0104
  18 #define SIRFUART_TX_FIFO_CTRL                   0x0108
  19 #define SIRFUART_TX_FIFO_LEVEL_CHK              0x010C
  20 #define SIRFUART_TX_FIFO_OP                     0x0110
  21 #define SIRFUART_TX_FIFO_STATUS                 0x0114
  22 #define SIRFUART_TX_FIFO_DATA                   0x0118
  23 #define SIRFUART_RX_DMA_IO_CTRL                 0x0120
  24 #define SIRFUART_RX_DMA_IO_LEN                  0x0124
  25 #define SIRFUART_RX_FIFO_CTRL                   0x0128
  26 #define SIRFUART_RX_FIFO_LEVEL_CHK              0x012C
  27 #define SIRFUART_RX_FIFO_OP                     0x0130
  28 #define SIRFUART_RX_FIFO_STATUS                 0x0134
  29 #define SIRFUART_RX_FIFO_DATA                   0x0138
  30 #define SIRFUART_AFC_CTRL                       0x0140
  31 #define SIRFUART_SWH_DMA_IO                     0x0148
  32
  33 /* UART Line Control Register */
  34 #define SIRFUART_DATA_BIT_LEN_MASK              0x3
  35 #define SIRFUART_DATA_BIT_LEN_5                 BIT(0)
  36 #define SIRFUART_DATA_BIT_LEN_6                 1
  37 #define SIRFUART_DATA_BIT_LEN_7                 2
  38 #define SIRFUART_DATA_BIT_LEN_8                 3
  39 #define SIRFUART_STOP_BIT_LEN_1                 0
  40 #define SIRFUART_STOP_BIT_LEN_2                 BIT(2)
  41 #define SIRFUART_PARITY_EN                      BIT(3)
  42 #define SIRFUART_EVEN_BIT                       BIT(4)
  43 #define SIRFUART_STICK_BIT_MASK                 (7 << 3)
  44 #define SIRFUART_STICK_BIT_NONE                 (0 << 3)
  45 #define SIRFUART_STICK_BIT_EVEN                 BIT(3)
  46 #define SIRFUART_STICK_BIT_ODD                  (3 << 3)
  47 #define SIRFUART_STICK_BIT_MARK                 (5 << 3)
  48 #define SIRFUART_STICK_BIT_SPACE                (7 << 3)
  49 #define SIRFUART_SET_BREAK                      BIT(6)
  50 #define SIRFUART_LOOP_BACK                      BIT(7)
  51 #define SIRFUART_PARITY_MASK                    (7 << 3)
  52 #define SIRFUART_DUMMY_READ                     BIT(16)
  53
  54 #define SIRFSOC_UART_RX_TIMEOUT(br, to) (((br) * (((to) + 999) / 1000)) / 1000)
  55 #define SIRFUART_RECV_TIMEOUT_MASK      (0xFFFF << 16)
  56 #define SIRFUART_RECV_TIMEOUT(x)        (((x) & 0xFFFF) << 16)
  57
  58 /* UART Auto Flow Control */
  59 #define SIRFUART_AFC_RX_THD_MASK                0x000000FF
  60 #define SIRFUART_AFC_RX_EN                      BIT(8)
  61 #define SIRFUART_AFC_TX_EN                      BIT(9)
  62 #define SIRFUART_CTS_CTRL                       BIT(10)
  63 #define SIRFUART_RTS_CTRL                       BIT(11)
  64 #define SIRFUART_CTS_IN_STATUS                  BIT(12)
  65 #define SIRFUART_RTS_OUT_STATUS                 BIT(13)
  66
  67 /* UART Interrupt Enable Register */
  68 #define SIRFUART_RX_DONE_INT                    BIT(0)
  69 #define SIRFUART_TX_DONE_INT                    BIT(1)
  70 #define SIRFUART_RX_OFLOW_INT                   BIT(2)
  71 #define SIRFUART_TX_ALLOUT_INT                  BIT(3)
  72 #define SIRFUART_RX_IO_DMA_INT                  BIT(4)
  73 #define SIRFUART_TX_IO_DMA_INT                  BIT(5)
  74 #define SIRFUART_RXFIFO_FULL_INT                BIT(6)
  75 #define SIRFUART_TXFIFO_EMPTY_INT               BIT(7)
  76 #define SIRFUART_RXFIFO_THD_INT                 BIT(8)
  77 #define SIRFUART_TXFIFO_THD_INT                 BIT(9)
  78 #define SIRFUART_FRM_ERR_INT                    BIT(10)
  79 #define SIRFUART_RXD_BREAK_INT                  BIT(11)
  80 #define SIRFUART_RX_TIMEOUT_INT                 BIT(12)
  81 #define SIRFUART_PARITY_ERR_INT                 BIT(13)
  82 #define SIRFUART_CTS_INT_EN                     BIT(14)
  83 #define SIRFUART_RTS_INT_EN                     BIT(15)
  84
  85 /* UART Interrupt Status Register */
  86 #define SIRFUART_RX_DONE                        BIT(0)
  87 #define SIRFUART_TX_DONE                        BIT(1)
  88 #define SIRFUART_RX_OFLOW                       BIT(2)
  89 #define SIRFUART_TX_ALL_EMPTY                   BIT(3)
  90 #define SIRFUART_DMA_IO_RX_DONE                 BIT(4)
  91 #define SIRFUART_DMA_IO_TX_DONE                 BIT(5)
  92 #define SIRFUART_RXFIFO_FULL                    BIT(6)
  93 #define SIRFUART_TXFIFO_EMPTY                   BIT(7)
  94 #define SIRFUART_RXFIFO_THD_REACH               BIT(8)
  95 #define SIRFUART_TXFIFO_THD_REACH               BIT(9)
  96 #define SIRFUART_FRM_ERR                        BIT(10)
  97 #define SIRFUART_RXD_BREAK                      BIT(11)
  98 #define SIRFUART_RX_TIMEOUT                     BIT(12)
  99 #define SIRFUART_PARITY_ERR                     BIT(13)
 100 #define SIRFUART_CTS_CHANGE                     BIT(14)
 101 #define SIRFUART_RTS_CHANGE                     BIT(15)
 102 #define SIRFUART_PLUG_IN                        BIT(16)
 103
 104 #define SIRFUART_ERR_INT_STAT                                   \
 105                                 (SIRFUART_RX_OFLOW |            \
 106                                 SIRFUART_FRM_ERR |              \
 107                                 SIRFUART_RXD_BREAK |            \
 108                                 SIRFUART_PARITY_ERR)
 109 #define SIRFUART_ERR_INT_EN                                     \
 110                                 (SIRFUART_RX_OFLOW_INT |        \
 111                                 SIRFUART_FRM_ERR_INT |          \
 112                                 SIRFUART_RXD_BREAK_INT |        \
 113                                 SIRFUART_PARITY_ERR_INT)
 114 #define SIRFUART_TX_INT_EN      SIRFUART_TXFIFO_EMPTY_INT
 115 #define SIRFUART_RX_IO_INT_EN                                   \
 116                                 (SIRFUART_RX_TIMEOUT_INT |      \
 117                                 SIRFUART_RXFIFO_THD_INT |       \
 118                                 SIRFUART_RXFIFO_FULL_INT |      \
 119                                 SIRFUART_ERR_INT_EN)
 120
 121 /* UART FIFO Register */
 122 #define SIRFUART_TX_FIFO_STOP                   0x0
 123 #define SIRFUART_TX_FIFO_RESET                  0x1
 124 #define SIRFUART_TX_FIFO_START                  0x2
 125 #define SIRFUART_RX_FIFO_STOP                   0x0
 126 #define SIRFUART_RX_FIFO_RESET                  0x1
 127 #define SIRFUART_RX_FIFO_START                  0x2
 128 #define SIRFUART_TX_MODE_DMA                    0
 129 #define SIRFUART_TX_MODE_IO                     1
 130 #define SIRFUART_RX_MODE_DMA                    0
 131 #define SIRFUART_RX_MODE_IO                     1
 132
 133 #define SIRFUART_RX_EN                          0x1
 134 #define SIRFUART_TX_EN                          0x2
 135
 136 /* Generic Definitions */
 137 #define SIRFSOC_UART_NAME                       "ttySiRF"
 138 #define SIRFSOC_UART_MAJOR                      0
 139 #define SIRFSOC_UART_MINOR                      0
 140 #define SIRFUART_PORT_NAME                      "sirfsoc-uart"
 141 #define SIRFUART_MAP_SIZE                       0x200
 142 #define SIRFSOC_UART_NR                         3
 143 #define SIRFSOC_PORT_TYPE                       0xa5
 144
 145 /* Baud Rate Calculation */
 146 #define SIRF_MIN_SAMPLE_DIV                     0xf
 147 #define SIRF_MAX_SAMPLE_DIV                     0x3f
 148 #define SIRF_IOCLK_DIV_MAX                      0xffff
 149 #define SIRF_SAMPLE_DIV_SHIFT                   16
 150 #define SIRF_IOCLK_DIV_MASK                     0xffff
 151 #define SIRF_SAMPLE_DIV_MASK                    0x3f0000
 152 #define SIRF_BAUD_RATE_SUPPORT_NR               18
 153
 154 /* For Fast Baud Rate Calculation */
 155 struct sirfsoc_baudrate_to_regv {
 156         unsigned int baud_rate;
 157         unsigned int reg_val;
 158 };
 159
 160 struct sirfsoc_uart_port {
 161         unsigned char                   hw_flow_ctrl;
 162         unsigned char                   ms_enabled;
 163
 164         struct uart_port                port;
 165         struct pinctrl                  *p;
 166 };
 167
 168 /* Hardware Flow Control */
 169 #define SIRFUART_AFC_CTRL_RX_THD        0x70
 170
 171 /* Register Access Control */
 172 #define portaddr(port, reg)             ((port)->membase + (reg))
 173 #define rd_regb(port, reg)              (__raw_readb(portaddr(port, reg)))
 174 #define rd_regl(port, reg)              (__raw_readl(portaddr(port, reg)))
 175 #define wr_regb(port, reg, val)         __raw_writeb(val, portaddr(port, reg))
 176 #define wr_regl(port, reg, val)         __raw_writel(val, portaddr(port, reg))
 177
 178 /* UART Port Mask */
 179 #define SIRFUART_FIFOLEVEL_MASK(port)   ((port->line == 1) ? (0x1f) : (0x7f))
 180 #define SIRFUART_FIFOFULL_MASK(port)    ((port->line == 1) ? (0x20) : (0x80))
 181 #define SIRFUART_FIFOEMPTY_MASK(port)   ((port->line == 1) ? (0x40) : (0x100))
 182
 183 /* I/O Mode */
 184 #define SIRFSOC_UART_IO_RX_MAX_CNT              256
 185 #define SIRFSOC_UART_IO_TX_REASONABLE_CNT       6