1 /* 2 * NS16550 Serial Port 3 * originally from linux source (arch/powerpc/boot/ns16550.h) 4 * 5 * Cleanup and unification 6 * (C) 2009 by Detlev Zundel, DENX Software Engineering GmbH 7 * 8 * modified slightly to 9 * have addresses as offsets from CONFIG_SYS_ISA_BASE 10 * added a few more definitions 11 * added prototypes for ns16550.c 12 * reduced no of com ports to 2 13 * modifications (c) Rob Taylor, Flying Pig Systems. 2000. 14 * 15 * added support for port on 64-bit bus 16 * by Richard Danter (richard.danter@windriver.com), (C) 2005 Wind River Systems 17 */ 18 19 /* 20 * Note that the following macro magic uses the fact that the compiler 21 * will not allocate storage for arrays of size 0 22 */ 23 24 #include <linux/types.h> 25 26 #ifdef CONFIG_DM_SERIAL 27 /* 28 * For driver model we always use one byte per register, and sort out the 29 * differences in the driver 30 */ 31 #define CONFIG_SYS_NS16550_REG_SIZE (-1) 32 #endif 33 34 #if !defined(CONFIG_SYS_NS16550_REG_SIZE) || (CONFIG_SYS_NS16550_REG_SIZE == 0) 35 #error "Please define NS16550 registers size." 36 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_DM_SERIAL) 37 #define UART_REG(x) u32 x 38 #elif (CONFIG_SYS_NS16550_REG_SIZE > 0) 39 #define UART_REG(x) \ 40 unsigned char prepad_##x[CONFIG_SYS_NS16550_REG_SIZE - 1]; \ 41 unsigned char x; 42 #elif (CONFIG_SYS_NS16550_REG_SIZE < 0) 43 #define UART_REG(x) \ 44 unsigned char x; \ 45 unsigned char postpad_##x[-CONFIG_SYS_NS16550_REG_SIZE - 1]; 46 #endif 47 48 /** 49 * struct ns16550_platdata - information about a NS16550 port 50 * 51 * @base: Base register address 52 * @reg_shift: Shift size of registers (0=byte, 1=16bit, 2=32bit...) 53 * @clock: UART base clock speed in Hz 54 */ 55 struct ns16550_platdata { 56 unsigned long base; 57 int reg_shift; 58 int clock; 59 }; 60 61 struct udevice; 62 63 struct NS16550 { 64 UART_REG(rbr); /* 0 */ 65 UART_REG(ier); /* 1 */ 66 UART_REG(fcr); /* 2 */ 67 UART_REG(lcr); /* 3 */ 68 UART_REG(mcr); /* 4 */ 69 UART_REG(lsr); /* 5 */ 70 UART_REG(msr); /* 6 */ 71 UART_REG(spr); /* 7 */ 72 #ifdef CONFIG_SOC_DA8XX 73 UART_REG(reg8); /* 8 */ 74 UART_REG(reg9); /* 9 */ 75 UART_REG(revid1); /* A */ 76 UART_REG(revid2); /* B */ 77 UART_REG(pwr_mgmt); /* C */ 78 UART_REG(mdr1); /* D */ 79 #else 80 UART_REG(mdr1); /* 8 */ 81 UART_REG(reg9); /* 9 */ 82 UART_REG(regA); /* A */ 83 UART_REG(regB); /* B */ 84 UART_REG(regC); /* C */ 85 UART_REG(regD); /* D */ 86 UART_REG(regE); /* E */ 87 UART_REG(uasr); /* F */ 88 UART_REG(scr); /* 10*/ 89 UART_REG(ssr); /* 11*/ 90 #endif 91 #ifdef CONFIG_DM_SERIAL 92 struct ns16550_platdata *plat; 93 #endif 94 }; 95 96 #define thr rbr 97 #define iir fcr 98 #define dll rbr 99 #define dlm ier 100 101 typedef struct NS16550 *NS16550_t; 102 103 /* 104 * These are the definitions for the FIFO Control Register 105 */ 106 #define UART_FCR_FIFO_EN 0x01 /* Fifo enable */ 107 #define UART_FCR_CLEAR_RCVR 0x02 /* Clear the RCVR FIFO */ 108 #define UART_FCR_CLEAR_XMIT 0x04 /* Clear the XMIT FIFO */ 109 #define UART_FCR_DMA_SELECT 0x08 /* For DMA applications */ 110 #define UART_FCR_TRIGGER_MASK 0xC0 /* Mask for the FIFO trigger range */ 111 #define UART_FCR_TRIGGER_1 0x00 /* Mask for trigger set at 1 */ 112 #define UART_FCR_TRIGGER_4 0x40 /* Mask for trigger set at 4 */ 113 #define UART_FCR_TRIGGER_8 0x80 /* Mask for trigger set at 8 */ 114 #define UART_FCR_TRIGGER_14 0xC0 /* Mask for trigger set at 14 */ 115 116 #define UART_FCR_RXSR 0x02 /* Receiver soft reset */ 117 #define UART_FCR_TXSR 0x04 /* Transmitter soft reset */ 118 119 /* 120 * These are the definitions for the Modem Control Register 121 */ 122 #define UART_MCR_DTR 0x01 /* DTR */ 123 #define UART_MCR_RTS 0x02 /* RTS */ 124 #define UART_MCR_OUT1 0x04 /* Out 1 */ 125 #define UART_MCR_OUT2 0x08 /* Out 2 */ 126 #define UART_MCR_LOOP 0x10 /* Enable loopback test mode */ 127 #define UART_MCR_AFE 0x20 /* Enable auto-RTS/CTS */ 128 129 #define UART_MCR_DMA_EN 0x04 130 #define UART_MCR_TX_DFR 0x08 131 132 /* 133 * These are the definitions for the Line Control Register 134 * 135 * Note: if the word length is 5 bits (UART_LCR_WLEN5), then setting 136 * UART_LCR_STOP will select 1.5 stop bits, not 2 stop bits. 137 */ 138 #define UART_LCR_WLS_MSK 0x03 /* character length select mask */ 139 #define UART_LCR_WLS_5 0x00 /* 5 bit character length */ 140 #define UART_LCR_WLS_6 0x01 /* 6 bit character length */ 141 #define UART_LCR_WLS_7 0x02 /* 7 bit character length */ 142 #define UART_LCR_WLS_8 0x03 /* 8 bit character length */ 143 #define UART_LCR_STB 0x04 /* # stop Bits, off=1, on=1.5 or 2) */ 144 #define UART_LCR_PEN 0x08 /* Parity eneble */ 145 #define UART_LCR_EPS 0x10 /* Even Parity Select */ 146 #define UART_LCR_STKP 0x20 /* Stick Parity */ 147 #define UART_LCR_SBRK 0x40 /* Set Break */ 148 #define UART_LCR_BKSE 0x80 /* Bank select enable */ 149 #define UART_LCR_DLAB 0x80 /* Divisor latch access bit */ 150 151 /* 152 * These are the definitions for the Line Status Register 153 */ 154 #define UART_LSR_DR 0x01 /* Data ready */ 155 #define UART_LSR_OE 0x02 /* Overrun */ 156 #define UART_LSR_PE 0x04 /* Parity error */ 157 #define UART_LSR_FE 0x08 /* Framing error */ 158 #define UART_LSR_BI 0x10 /* Break */ 159 #define UART_LSR_THRE 0x20 /* Xmit holding register empty */ 160 #define UART_LSR_TEMT 0x40 /* Xmitter empty */ 161 #define UART_LSR_ERR 0x80 /* Error */ 162 163 #define UART_MSR_DCD 0x80 /* Data Carrier Detect */ 164 #define UART_MSR_RI 0x40 /* Ring Indicator */ 165 #define UART_MSR_DSR 0x20 /* Data Set Ready */ 166 #define UART_MSR_CTS 0x10 /* Clear to Send */ 167 #define UART_MSR_DDCD 0x08 /* Delta DCD */ 168 #define UART_MSR_TERI 0x04 /* Trailing edge ring indicator */ 169 #define UART_MSR_DDSR 0x02 /* Delta DSR */ 170 #define UART_MSR_DCTS 0x01 /* Delta CTS */ 171 172 /* 173 * These are the definitions for the Interrupt Identification Register 174 */ 175 #define UART_IIR_NO_INT 0x01 /* No interrupts pending */ 176 #define UART_IIR_ID 0x06 /* Mask for the interrupt ID */ 177 178 #define UART_IIR_MSI 0x00 /* Modem status interrupt */ 179 #define UART_IIR_THRI 0x02 /* Transmitter holding register empty */ 180 #define UART_IIR_RDI 0x04 /* Receiver data interrupt */ 181 #define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */ 182 183 /* 184 * These are the definitions for the Interrupt Enable Register 185 */ 186 #define UART_IER_MSI 0x08 /* Enable Modem status interrupt */ 187 #define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */ 188 #define UART_IER_THRI 0x02 /* Enable Transmitter holding register int. */ 189 #define UART_IER_RDI 0x01 /* Enable receiver data interrupt */ 190 191 /* useful defaults for LCR */ 192 #define UART_LCR_8N1 0x03 193 194 void NS16550_init(NS16550_t com_port, int baud_divisor); 195 void NS16550_putc(NS16550_t com_port, char c); 196 char NS16550_getc(NS16550_t com_port); 197 int NS16550_tstc(NS16550_t com_port); 198 void NS16550_reinit(NS16550_t com_port, int baud_divisor); 199 200 /** 201 * ns16550_calc_divisor() - calculate the divisor given clock and baud rate 202 * 203 * Given the UART input clock and required baudrate, calculate the divisor 204 * that should be used. 205 * 206 * @port: UART port 207 * @clock: UART input clock speed in Hz 208 * @baudrate: Required baud rate 209 * @return baud rate divisor that should be used 210 */ 211 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate); 212 213 /** 214 * ns16550_serial_ofdata_to_platdata() - convert DT to platform data 215 * 216 * Decode a device tree node for an ns16550 device. This includes the 217 * register base address and register shift properties. The caller must set 218 * up the clock frequency. 219 * 220 * @dev: dev to decode platform data for 221 * @return: 0 if OK, -EINVAL on error 222 */ 223 int ns16550_serial_ofdata_to_platdata(struct udevice *dev); 224 225 /** 226 * ns16550_serial_probe() - probe a serial port 227 * 228 * This sets up the serial port ready for use, except for the baud rate 229 * @return 0, or -ve on error 230 */ 231 int ns16550_serial_probe(struct udevice *dev); 232 233 /** 234 * struct ns16550_serial_ops - ns16550 serial operations 235 * 236 * These should be used by the client driver for the driver's 'ops' member 237 */ 238 extern const struct dm_serial_ops ns16550_serial_ops; 239