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 6 186