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 {
66 UART_REG(rbr); /* 0 */
67 UART_REG(ier); /* 1 */
68 UART_REG(fcr); /* 2 */
69 UART_REG(lcr); /* 3 */
70 UART_REG(mcr); /* 4 */
71 UART_REG(lsr); /* 5 */
72 UART_REG(msr); /* 6 */
73 UART_REG(spr); /* 7 */
74 #ifdef CONFIG_SOC_DA8XX
75 UART_REG(reg8); /* 8 */
76 UART_REG(reg9); /* 9 */
77 UART_REG(revid1); /* A */
78 UART_REG(revid2); /* B */
79 UART_REG(pwr_mgmt); /* C */
80 UART_REG(mdr1); /* D */
82 UART_REG(mdr1); /* 8 */
83 UART_REG(reg9); /* 9 */
84 UART_REG(regA); /* A */
85 UART_REG(regB); /* B */
86 UART_REG(regC); /* C */
87 UART_REG(regD); /* D */
88 UART_REG(regE); /* E */
89 UART_REG(uasr); /* F */
90 UART_REG(scr); /* 10*/
91 UART_REG(ssr); /* 11*/
93 #ifdef CONFIG_DM_SERIAL
94 struct ns16550_platdata *plat;
103 typedef struct NS16550 *NS16550_t;
106 * These are the definitions for the FIFO Control Register
108 #define UART_FCR_FIFO_EN 0x01 /* Fifo enable */
109 #define UART_FCR_CLEAR_RCVR 0x02 /* Clear the RCVR FIFO */
110 #define UART_FCR_CLEAR_XMIT 0x04 /* Clear the XMIT FIFO */
111 #define UART_FCR_DMA_SELECT 0x08 /* For DMA applications */
112 #define UART_FCR_TRIGGER_MASK 0xC0 /* Mask for the FIFO trigger range */
113 #define UART_FCR_TRIGGER_1 0x00 /* Mask for trigger set at 1 */
114 #define UART_FCR_TRIGGER_4 0x40 /* Mask for trigger set at 4 */
115 #define UART_FCR_TRIGGER_8 0x80 /* Mask for trigger set at 8 */
116 #define UART_FCR_TRIGGER_14 0xC0 /* Mask for trigger set at 14 */
118 #define UART_FCR_RXSR 0x02 /* Receiver soft reset */
119 #define UART_FCR_TXSR 0x04 /* Transmitter soft reset */
121 /* Ingenic JZ47xx specific UART-enable bit. */
122 #define UART_FCR_UME 0x10
124 /* Clear & enable FIFOs */
125 #define UART_FCR_DEFVAL (UART_FCR_FIFO_EN | \
130 * These are the definitions for the Modem Control Register
132 #define UART_MCR_DTR 0x01 /* DTR */
133 #define UART_MCR_RTS 0x02 /* RTS */
134 #define UART_MCR_OUT1 0x04 /* Out 1 */
135 #define UART_MCR_OUT2 0x08 /* Out 2 */
136 #define UART_MCR_LOOP 0x10 /* Enable loopback test mode */
137 #define UART_MCR_AFE 0x20 /* Enable auto-RTS/CTS */
139 #define UART_MCR_DMA_EN 0x04
140 #define UART_MCR_TX_DFR 0x08
143 * These are the definitions for the Line Control Register
145 * Note: if the word length is 5 bits (UART_LCR_WLEN5), then setting
146 * UART_LCR_STOP will select 1.5 stop bits, not 2 stop bits.
148 #define UART_LCR_WLS_MSK 0x03 /* character length select mask */
149 #define UART_LCR_WLS_5 0x00 /* 5 bit character length */
150 #define UART_LCR_WLS_6 0x01 /* 6 bit character length */
151 #define UART_LCR_WLS_7 0x02 /* 7 bit character length */
152 #define UART_LCR_WLS_8 0x03 /* 8 bit character length */
153 #define UART_LCR_STB 0x04 /* # stop Bits, off=1, on=1.5 or 2) */
154 #define UART_LCR_PEN 0x08 /* Parity eneble */
155 #define UART_LCR_EPS 0x10 /* Even Parity Select */
156 #define UART_LCR_STKP 0x20 /* Stick Parity */
157 #define UART_LCR_SBRK 0x40 /* Set Break */
158 #define UART_LCR_BKSE 0x80 /* Bank select enable */
159 #define UART_LCR_DLAB 0x80 /* Divisor latch access bit */
162 * These are the definitions for the Line Status Register
164 #define UART_LSR_DR 0x01 /* Data ready */
165 #define UART_LSR_OE 0x02 /* Overrun */
166 #define UART_LSR_PE 0x04 /* Parity error */
167 #define UART_LSR_FE 0x08 /* Framing error */
168 #define UART_LSR_BI 0x10 /* Break */
169 #define UART_LSR_THRE 0x20 /* Xmit holding register empty */
170 #define UART_LSR_TEMT 0x40 /* Xmitter empty */
171 #define UART_LSR_ERR 0x80 /* Error */
173 #define UART_MSR_DCD 0x80 /* Data Carrier Detect */
174 #define UART_MSR_RI 0x40 /* Ring Indicator */
175 #define UART_MSR_DSR 0x20 /* Data Set Ready */
176 #define UART_MSR_CTS 0x10 /* Clear to Send */
177 #define UART_MSR_DDCD 0x08 /* Delta DCD */
178 #define UART_MSR_TERI 0x04 /* Trailing edge ring indicator */
179 #define UART_MSR_DDSR 0x02 /* Delta DSR */
180 #define UART_MSR_DCTS 0x01 /* Delta CTS */
183 * These are the definitions for the Interrupt Identification Register
185 #define UART_IIR_NO_INT 0x01 /* No interrupts pending */
186 #define UART_IIR_ID 0x06 /* Mask for the interrupt ID */
188 #define UART_IIR_MSI 0x00 /* Modem status interrupt */
189 #define UART_IIR_THRI 0x02 /* Transmitter holding register empty */
190 #define UART_IIR_RDI 0x04 /* Receiver data interrupt */
191 #define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */
194 * These are the definitions for the Interrupt Enable Register
196 #define UART_IER_MSI 0x08 /* Enable Modem status interrupt */
197 #define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */
198 #define UART_IER_THRI 0x02 /* Enable Transmitter holding register int. */
199 #define UART_IER_RDI 0x01 /* Enable receiver data interrupt */
201 /* useful defaults for LCR */
202 #define UART_LCR_8N1 0x03
204 void NS16550_init(NS16550_t com_port, int baud_divisor);
205 void NS16550_putc(NS16550_t com_port, char c);
206 char NS16550_getc(NS16550_t com_port);
207 int NS16550_tstc(NS16550_t com_port);
208 void NS16550_reinit(NS16550_t com_port, int baud_divisor);
211 * ns16550_calc_divisor() - calculate the divisor given clock and baud rate
213 * Given the UART input clock and required baudrate, calculate the divisor
214 * that should be used.
217 * @clock: UART input clock speed in Hz
218 * @baudrate: Required baud rate
219 * @return baud rate divisor that should be used
221 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate);
224 * ns16550_serial_ofdata_to_platdata() - convert DT to platform data
226 * Decode a device tree node for an ns16550 device. This includes the
227 * register base address and register shift properties. The caller must set
228 * up the clock frequency.
230 * @dev: dev to decode platform data for
231 * @return: 0 if OK, -EINVAL on error
233 int ns16550_serial_ofdata_to_platdata(struct udevice *dev);
236 * ns16550_serial_probe() - probe a serial port
238 * This sets up the serial port ready for use, except for the baud rate
239 * @return 0, or -ve on error
241 int ns16550_serial_probe(struct udevice *dev);
244 * struct ns16550_serial_ops - ns16550 serial operations
246 * These should be used by the client driver for the driver's 'ops' member
248 extern const struct dm_serial_ops ns16550_serial_ops;