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
27 #include <linux/types.h>
29 #ifdef CONFIG_DM_SERIAL
31 * For driver model we always use one byte per register, and sort out the
32 * differences in the driver
34 #define CONFIG_SYS_NS16550_REG_SIZE (-1)
37 #ifdef CONFIG_NS16550_DYNAMIC
38 #define UART_REG(x) unsigned char x
40 #if !defined(CONFIG_SYS_NS16550_REG_SIZE) || (CONFIG_SYS_NS16550_REG_SIZE == 0)
41 #error "Please define NS16550 registers size."
42 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_DM_SERIAL)
43 #define UART_REG(x) u32 x
44 #elif (CONFIG_SYS_NS16550_REG_SIZE > 0)
46 unsigned char prepad_##x[CONFIG_SYS_NS16550_REG_SIZE - 1]; \
48 #elif (CONFIG_SYS_NS16550_REG_SIZE < 0)
51 unsigned char postpad_##x[-CONFIG_SYS_NS16550_REG_SIZE - 1];
53 #endif /* CONFIG_NS16550_DYNAMIC */
56 NS16550_FLAG_IO = 1 << 0, /* Use I/O access (else mem-mapped) */
57 NS16550_FLAG_ENDIAN = 1 << 1, /* Use out_le/be_32() */
58 NS16550_FLAG_BE = 1 << 2, /* Big-endian access (else little) */
62 * struct ns16550_plat - information about a NS16550 port
64 * @base: Base register address
65 * @reg_width: IO accesses size of registers (in bytes, 1 or 4)
66 * @reg_shift: Shift size of registers (0=byte, 1=16bit, 2=32bit...)
67 * @reg_offset: Offset to start of registers (normally 0)
68 * @clock: UART base clock speed in Hz
69 * @fcr: Offset of FCR register (normally UART_FCR_DEFVAL)
70 * @flags: A few flags (enum ns16550_flags)
71 * @bdf: PCI slot/function (pci_dev_t)
81 #if defined(CONFIG_PCI) && defined(CONFIG_SPL)
89 UART_REG(rbr); /* 0 */
90 UART_REG(ier); /* 1 */
91 UART_REG(fcr); /* 2 */
92 UART_REG(lcr); /* 3 */
93 UART_REG(mcr); /* 4 */
94 UART_REG(lsr); /* 5 */
95 UART_REG(msr); /* 6 */
96 UART_REG(spr); /* 7 */
97 #ifdef CONFIG_SOC_DA8XX
98 UART_REG(reg8); /* 8 */
99 UART_REG(reg9); /* 9 */
100 UART_REG(revid1); /* A */
101 UART_REG(revid2); /* B */
102 UART_REG(pwr_mgmt); /* C */
103 UART_REG(mdr1); /* D */
105 UART_REG(mdr1); /* 8 */
106 UART_REG(reg9); /* 9 */
107 UART_REG(regA); /* A */
108 UART_REG(regB); /* B */
109 UART_REG(regC); /* C */
110 UART_REG(regD); /* D */
111 UART_REG(regE); /* E */
112 UART_REG(uasr); /* F */
113 UART_REG(scr); /* 10*/
114 UART_REG(ssr); /* 11*/
116 #ifdef CONFIG_DM_SERIAL
117 struct ns16550_plat *plat;
127 * These are the definitions for the FIFO Control Register
129 #define UART_FCR_FIFO_EN 0x01 /* Fifo enable */
130 #define UART_FCR_CLEAR_RCVR 0x02 /* Clear the RCVR FIFO */
131 #define UART_FCR_CLEAR_XMIT 0x04 /* Clear the XMIT FIFO */
132 #define UART_FCR_DMA_SELECT 0x08 /* For DMA applications */
133 #define UART_FCR_TRIGGER_MASK 0xC0 /* Mask for the FIFO trigger range */
134 #define UART_FCR_TRIGGER_1 0x00 /* Mask for trigger set at 1 */
135 #define UART_FCR_TRIGGER_4 0x40 /* Mask for trigger set at 4 */
136 #define UART_FCR_TRIGGER_8 0x80 /* Mask for trigger set at 8 */
137 #define UART_FCR_TRIGGER_14 0xC0 /* Mask for trigger set at 14 */
139 #define UART_FCR_RXSR 0x02 /* Receiver soft reset */
140 #define UART_FCR_TXSR 0x04 /* Transmitter soft reset */
142 /* Ingenic JZ47xx specific UART-enable bit. */
143 #define UART_FCR_UME 0x10
145 /* Clear & enable FIFOs */
146 #define UART_FCR_DEFVAL (UART_FCR_FIFO_EN | \
151 * These are the definitions for the Modem Control Register
153 #define UART_MCR_DTR 0x01 /* DTR */
154 #define UART_MCR_RTS 0x02 /* RTS */
155 #define UART_MCR_OUT1 0x04 /* Out 1 */
156 #define UART_MCR_OUT2 0x08 /* Out 2 */
157 #define UART_MCR_LOOP 0x10 /* Enable loopback test mode */
158 #define UART_MCR_AFE 0x20 /* Enable auto-RTS/CTS */
160 #define UART_MCR_DMA_EN 0x04
161 #define UART_MCR_TX_DFR 0x08
164 * These are the definitions for the Line Control Register
166 * Note: if the word length is 5 bits (UART_LCR_WLEN5), then setting
167 * UART_LCR_STOP will select 1.5 stop bits, not 2 stop bits.
169 #define UART_LCR_WLS_MSK 0x03 /* character length select mask */
170 #define UART_LCR_WLS_5 0x00 /* 5 bit character length */
171 #define UART_LCR_WLS_6 0x01 /* 6 bit character length */
172 #define UART_LCR_WLS_7 0x02 /* 7 bit character length */
173 #define UART_LCR_WLS_8 0x03 /* 8 bit character length */
174 #define UART_LCR_STB 0x04 /* # stop Bits, off=1, on=1.5 or 2) */
175 #define UART_LCR_PEN 0x08 /* Parity eneble */
176 #define UART_LCR_EPS 0x10 /* Even Parity Select */
177 #define UART_LCR_STKP 0x20 /* Stick Parity */
178 #define UART_LCR_SBRK 0x40 /* Set Break */
179 #define UART_LCR_BKSE 0x80 /* Bank select enable */
180 #define UART_LCR_DLAB 0x80 /* Divisor latch access bit */
183 * These are the definitions for the Line Status Register
185 #define UART_LSR_DR 0x01 /* Data ready */
186 #define UART_LSR_OE 0x02 /* Overrun */
187 #define UART_LSR_PE 0x04 /* Parity error */
188 #define UART_LSR_FE 0x08 /* Framing error */
189 #define UART_LSR_BI 0x10 /* Break */
190 #define UART_LSR_THRE 0x20 /* Xmit holding register empty */
191 #define UART_LSR_TEMT 0x40 /* Xmitter empty */
192 #define UART_LSR_ERR 0x80 /* Error */
194 #define UART_MSR_DCD 0x80 /* Data Carrier Detect */
195 #define UART_MSR_RI 0x40 /* Ring Indicator */
196 #define UART_MSR_DSR 0x20 /* Data Set Ready */
197 #define UART_MSR_CTS 0x10 /* Clear to Send */
198 #define UART_MSR_DDCD 0x08 /* Delta DCD */
199 #define UART_MSR_TERI 0x04 /* Trailing edge ring indicator */
200 #define UART_MSR_DDSR 0x02 /* Delta DSR */
201 #define UART_MSR_DCTS 0x01 /* Delta CTS */
204 * These are the definitions for the Interrupt Identification Register
206 #define UART_IIR_NO_INT 0x01 /* No interrupts pending */
207 #define UART_IIR_ID 0x06 /* Mask for the interrupt ID */
209 #define UART_IIR_MSI 0x00 /* Modem status interrupt */
210 #define UART_IIR_THRI 0x02 /* Transmitter holding register empty */
211 #define UART_IIR_RDI 0x04 /* Receiver data interrupt */
212 #define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */
215 * These are the definitions for the Interrupt Enable Register
217 #define UART_IER_MSI 0x08 /* Enable Modem status interrupt */
218 #define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */
219 #define UART_IER_THRI 0x02 /* Enable Transmitter holding register int. */
220 #define UART_IER_RDI 0x01 /* Enable receiver data interrupt */
222 /* useful defaults for LCR */
223 #define UART_LCR_8N1 0x03
225 void ns16550_init(struct ns16550 *com_port, int baud_divisor);
226 void ns16550_putc(struct ns16550 *com_port, char c);
227 char ns16550_getc(struct ns16550 *com_port);
228 int ns16550_tstc(struct ns16550 *com_port);
229 void ns16550_reinit(struct ns16550 *com_port, int baud_divisor);
232 * ns16550_calc_divisor() - calculate the divisor given clock and baud rate
234 * Given the UART input clock and required baudrate, calculate the divisor
235 * that should be used.
238 * @clock: UART input clock speed in Hz
239 * @baudrate: Required baud rate
240 * @return baud rate divisor that should be used
242 int ns16550_calc_divisor(struct ns16550 *port, int clock, int baudrate);
245 * ns16550_serial_of_to_plat() - convert DT to platform data
247 * Decode a device tree node for an ns16550 device. This includes the
248 * register base address and register shift properties. The caller must set
249 * up the clock frequency.
251 * @dev: dev to decode platform data for
252 * @return: 0 if OK, -EINVAL on error
254 int ns16550_serial_of_to_plat(struct udevice *dev);
257 * ns16550_serial_probe() - probe a serial port
259 * This sets up the serial port ready for use, except for the baud rate
260 * @return 0, or -ve on error
262 int ns16550_serial_probe(struct udevice *dev);
265 * struct ns16550_serial_ops - ns16550 serial operations
267 * These should be used by the client driver for the driver's 'ops' member
269 extern const struct dm_serial_ops ns16550_serial_ops;
271 #endif /* __ns16550_h */