3 * originally from linux source (arch/powerpc/boot/ns16550.h)
5 * Cleanup and unification
6 * (C) 2009 by Detlev Zundel, DENX Software Engineering GmbH
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.
15 * added support for port on 64-bit bus
16 * by Richard Danter (richard.danter@windriver.com), (C) 2005 Wind River Systems
20 * Note that the following macro magic uses the fact that the compiler
21 * will not allocate storage for arrays of size 0
24 #include <linux/types.h>
26 #ifdef CONFIG_DM_SERIAL
28 * For driver model we always use one byte per register, and sort out the
29 * differences in the driver
31 #define CONFIG_SYS_NS16550_REG_SIZE (-1)
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)
40 unsigned char prepad_##x[CONFIG_SYS_NS16550_REG_SIZE - 1]; \
42 #elif (CONFIG_SYS_NS16550_REG_SIZE < 0)
45 unsigned char postpad_##x[-CONFIG_SYS_NS16550_REG_SIZE - 1];
49 * struct ns16550_platdata - information about a NS16550 port
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
55 struct ns16550_platdata {
65 UART_REG(rbr); /* 0 */
66 UART_REG(ier); /* 1 */
67 UART_REG(fcr); /* 2 */
68 UART_REG(lcr); /* 3 */
69 UART_REG(mcr); /* 4 */
70 UART_REG(lsr); /* 5 */
71 UART_REG(msr); /* 6 */
72 UART_REG(spr); /* 7 */
73 #ifdef CONFIG_SOC_DA8XX
74 UART_REG(reg8); /* 8 */
75 UART_REG(reg9); /* 9 */
76 UART_REG(revid1); /* A */
77 UART_REG(revid2); /* B */
78 UART_REG(pwr_mgmt); /* C */
79 UART_REG(mdr1); /* D */
81 UART_REG(mdr1); /* 8 */
82 UART_REG(reg9); /* 9 */
83 UART_REG(regA); /* A */
84 UART_REG(regB); /* B */
85 UART_REG(regC); /* C */
86 UART_REG(regD); /* D */
87 UART_REG(regE); /* E */
88 UART_REG(uasr); /* F */
89 UART_REG(scr); /* 10*/
90 UART_REG(ssr); /* 11*/
92 #ifdef CONFIG_DM_SERIAL
93 struct ns16550_platdata *plat;
102 typedef struct NS16550 *NS16550_t;
105 * These are the definitions for the FIFO Control Register
107 #define UART_FCR_FIFO_EN 0x01 /* Fifo enable */
108 #define UART_FCR_CLEAR_RCVR 0x02 /* Clear the RCVR FIFO */
109 #define UART_FCR_CLEAR_XMIT 0x04 /* Clear the XMIT FIFO */
110 #define UART_FCR_DMA_SELECT 0x08 /* For DMA applications */
111 #define UART_FCR_TRIGGER_MASK 0xC0 /* Mask for the FIFO trigger range */
112 #define UART_FCR_TRIGGER_1 0x00 /* Mask for trigger set at 1 */
113 #define UART_FCR_TRIGGER_4 0x40 /* Mask for trigger set at 4 */
114 #define UART_FCR_TRIGGER_8 0x80 /* Mask for trigger set at 8 */
115 #define UART_FCR_TRIGGER_14 0xC0 /* Mask for trigger set at 14 */
117 #define UART_FCR_RXSR 0x02 /* Receiver soft reset */
118 #define UART_FCR_TXSR 0x04 /* Transmitter soft reset */
121 * These are the definitions for the Modem Control Register
123 #define UART_MCR_DTR 0x01 /* DTR */
124 #define UART_MCR_RTS 0x02 /* RTS */
125 #define UART_MCR_OUT1 0x04 /* Out 1 */
126 #define UART_MCR_OUT2 0x08 /* Out 2 */
127 #define UART_MCR_LOOP 0x10 /* Enable loopback test mode */
128 #define UART_MCR_AFE 0x20 /* Enable auto-RTS/CTS */
130 #define UART_MCR_DMA_EN 0x04
131 #define UART_MCR_TX_DFR 0x08
134 * These are the definitions for the Line Control Register
136 * Note: if the word length is 5 bits (UART_LCR_WLEN5), then setting
137 * UART_LCR_STOP will select 1.5 stop bits, not 2 stop bits.
139 #define UART_LCR_WLS_MSK 0x03 /* character length select mask */
140 #define UART_LCR_WLS_5 0x00 /* 5 bit character length */
141 #define UART_LCR_WLS_6 0x01 /* 6 bit character length */
142 #define UART_LCR_WLS_7 0x02 /* 7 bit character length */
143 #define UART_LCR_WLS_8 0x03 /* 8 bit character length */
144 #define UART_LCR_STB 0x04 /* # stop Bits, off=1, on=1.5 or 2) */
145 #define UART_LCR_PEN 0x08 /* Parity eneble */
146 #define UART_LCR_EPS 0x10 /* Even Parity Select */
147 #define UART_LCR_STKP 0x20 /* Stick Parity */
148 #define UART_LCR_SBRK 0x40 /* Set Break */
149 #define UART_LCR_BKSE 0x80 /* Bank select enable */
150 #define UART_LCR_DLAB 0x80 /* Divisor latch access bit */
153 * These are the definitions for the Line Status Register
155 #define UART_LSR_DR 0x01 /* Data ready */
156 #define UART_LSR_OE 0x02 /* Overrun */
157 #define UART_LSR_PE 0x04 /* Parity error */
158 #define UART_LSR_FE 0x08 /* Framing error */
159 #define UART_LSR_BI 0x10 /* Break */
160 #define UART_LSR_THRE 0x20 /* Xmit holding register empty */
161 #define UART_LSR_TEMT 0x40 /* Xmitter empty */
162 #define UART_LSR_ERR 0x80 /* Error */
164 #define UART_MSR_DCD 0x80 /* Data Carrier Detect */
165 #define UART_MSR_RI 0x40 /* Ring Indicator */
166 #define UART_MSR_DSR 0x20 /* Data Set Ready */
167 #define UART_MSR_CTS 0x10 /* Clear to Send */
168 #define UART_MSR_DDCD 0x08 /* Delta DCD */
169 #define UART_MSR_TERI 0x04 /* Trailing edge ring indicator */
170 #define UART_MSR_DDSR 0x02 /* Delta DSR */
171 #define UART_MSR_DCTS 0x01 /* Delta CTS */
174 * These are the definitions for the Interrupt Identification Register
176 #define UART_IIR_NO_INT 0x01 /* No interrupts pending */
177 #define UART_IIR_ID 0x06 /* Mask for the interrupt ID */
179 #define UART_IIR_MSI 0x00 /* Modem status interrupt */
180 #define UART_IIR_THRI 0x02 /* Transmitter holding register empty */
181 #define UART_IIR_RDI 0x04 /* Receiver data interrupt */
182 #define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */
185 * These are the definitions for the Interrupt Enable Register
187 #define UART_IER_MSI 0x08 /* Enable Modem status interrupt */
188 #define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */
189 #define UART_IER_THRI 0x02 /* Enable Transmitter holding register int. */
190 #define UART_IER_RDI 0x01 /* Enable receiver data interrupt */
192 /* useful defaults for LCR */
193 #define UART_LCR_8N1 0x03
195 void NS16550_init(NS16550_t com_port, int baud_divisor);
196 void NS16550_putc(NS16550_t com_port, char c);
197 char NS16550_getc(NS16550_t com_port);
198 int NS16550_tstc(NS16550_t com_port);
199 void NS16550_reinit(NS16550_t com_port, int baud_divisor);
202 * ns16550_calc_divisor() - calculate the divisor given clock and baud rate
204 * Given the UART input clock and required baudrate, calculate the divisor
205 * that should be used.
208 * @clock: UART input clock speed in Hz
209 * @baudrate: Required baud rate
210 * @return baud rate divisor that should be used
212 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate);
215 * ns16550_serial_ofdata_to_platdata() - convert DT to platform data
217 * Decode a device tree node for an ns16550 device. This includes the
218 * register base address and register shift properties. The caller must set
219 * up the clock frequency.
221 * @dev: dev to decode platform data for
222 * @return: 0 if OK, -EINVAL on error
224 int ns16550_serial_ofdata_to_platdata(struct udevice *dev);
227 * ns16550_serial_probe() - probe a serial port
229 * This sets up the serial port ready for use, except for the baud rate
230 * @return 0, or -ve on error
232 int ns16550_serial_probe(struct udevice *dev);
235 * struct ns16550_serial_ops - ns16550 serial operations
237 * These should be used by the client driver for the driver's 'ops' member
239 extern const struct dm_serial_ops ns16550_serial_ops;