2 * (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <asm/arch/mx31.h>
25 #include <asm/arch/imx-regs.h>
26 #include <asm/arch/clock.h>
29 #define __REG(x) (*((volatile u32 *)(x)))
31 #if defined(CONFIG_SYS_MX31_UART1) || defined(CONFIG_SYS_MX25_UART1)
32 #define UART_PHYS 0x43f90000
33 #elif defined(CONFIG_SYS_MX31_UART2) || defined(CONFIG_SYS_MX25_UART2)
34 #define UART_PHYS 0x43f94000
35 #elif defined(CONFIG_SYS_MX31_UART3) || defined(CONFIG_SYS_MX25_UART3)
36 #define UART_PHYS 0x5000c000
37 #elif defined(CONFIG_SYS_MX31_UART4) || defined(CONFIG_SYS_MX25_UART4)
38 #define UART_PHYS 0x43fb0000
39 #elif defined(CONFIG_SYS_MX31_UART5) || defined(CONFIG_SYS_MX25_UART5)
40 #define UART_PHYS 0x43fb4000
41 #elif defined(CONFIG_SYS_MX27_UART1)
42 #define UART_PHYS 0x1000a000
43 #elif defined(CONFIG_SYS_MX27_UART2)
44 #define UART_PHYS 0x1000b000
45 #elif defined(CONFIG_SYS_MX27_UART3)
46 #define UART_PHYS 0x1000c000
47 #elif defined(CONFIG_SYS_MX27_UART4)
48 #define UART_PHYS 0x1000d000
49 #elif defined(CONFIG_SYS_MX27_UART5)
50 #define UART_PHYS 0x1001b000
51 #elif defined(CONFIG_SYS_MX27_UART6)
52 #define UART_PHYS 0x1001c000
53 #elif defined(CONFIG_SYS_MX51_UART1)
54 #define UART_PHYS UART1_BASE_ADDR
55 #elif defined(CONFIG_SYS_MX51_UART2)
56 #define UART_PHYS UART2_BASE_ADDR
57 #elif defined(CONFIG_SYS_MX51_UART3)
58 #define UART_PHYS UART3_BASE_ADDR
59 #elif defined(CONFIG_SYS_MX53_UART1)
60 #define UART_PHYS UART1_BASE_ADDR
61 #elif defined(CONFIG_SYS_MX53_UART2)
62 #define UART_PHYS UART2_BASE_ADDR
63 #elif defined(CONFIG_SYS_MX53_UART3)
64 #define UART_PHYS UART3_BASE_ADDR
66 #error "define CONFIG_SYS_MXxx_UARTx to use the MXC UART driver"
69 #ifdef CONFIG_SERIAL_MULTI
70 #warning "MXC driver does not support MULTI serials."
73 /* Register definitions */
74 #define URXD 0x0 /* Receiver Register */
75 #define UTXD 0x40 /* Transmitter Register */
76 #define UCR1 0x80 /* Control Register 1 */
77 #define UCR2 0x84 /* Control Register 2 */
78 #define UCR3 0x88 /* Control Register 3 */
79 #define UCR4 0x8c /* Control Register 4 */
80 #define UFCR 0x90 /* FIFO Control Register */
81 #define USR1 0x94 /* Status Register 1 */
82 #define USR2 0x98 /* Status Register 2 */
83 #define UESC 0x9c /* Escape Character Register */
84 #define UTIM 0xa0 /* Escape Timer Register */
85 #define UBIR 0xa4 /* BRM Incremental Register */
86 #define UBMR 0xa8 /* BRM Modulator Register */
87 #define UBRC 0xac /* Baud Rate Count Register */
88 #define UTS 0xb4 /* UART Test Register (mx31) */
90 /* UART Control Register Bit Fields.*/
91 #define URXD_CHARRDY (1<<15)
92 #define URXD_ERR (1<<14)
93 #define URXD_OVRRUN (1<<13)
94 #define URXD_FRMERR (1<<12)
95 #define URXD_BRK (1<<11)
96 #define URXD_PRERR (1<<10)
97 #define URXD_RX_DATA (0xFF)
98 #define UCR1_ADEN (1<<15) /* Auto dectect interrupt */
99 #define UCR1_ADBR (1<<14) /* Auto detect baud rate */
100 #define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */
101 #define UCR1_IDEN (1<<12) /* Idle condition interrupt */
102 #define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */
103 #define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */
104 #define UCR1_IREN (1<<7) /* Infrared interface enable */
105 #define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */
106 #define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */
107 #define UCR1_SNDBRK (1<<4) /* Send break */
108 #define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */
109 #define UCR1_UARTCLKEN (1<<2) /* UART clock enabled */
110 #define UCR1_DOZE (1<<1) /* Doze */
111 #define UCR1_UARTEN (1<<0) /* UART enabled */
112 #define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */
113 #define UCR2_IRTS (1<<14) /* Ignore RTS pin */
114 #define UCR2_CTSC (1<<13) /* CTS pin control */
115 #define UCR2_CTS (1<<12) /* Clear to send */
116 #define UCR2_ESCEN (1<<11) /* Escape enable */
117 #define UCR2_PREN (1<<8) /* Parity enable */
118 #define UCR2_PROE (1<<7) /* Parity odd/even */
119 #define UCR2_STPB (1<<6) /* Stop */
120 #define UCR2_WS (1<<5) /* Word size */
121 #define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */
122 #define UCR2_TXEN (1<<2) /* Transmitter enabled */
123 #define UCR2_RXEN (1<<1) /* Receiver enabled */
124 #define UCR2_SRST (1<<0) /* SW reset */
125 #define UCR3_DTREN (1<<13) /* DTR interrupt enable */
126 #define UCR3_PARERREN (1<<12) /* Parity enable */
127 #define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */
128 #define UCR3_DSR (1<<10) /* Data set ready */
129 #define UCR3_DCD (1<<9) /* Data carrier detect */
130 #define UCR3_RI (1<<8) /* Ring indicator */
131 #define UCR3_TIMEOUTEN (1<<7) /* Timeout interrupt enable */
132 #define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */
133 #define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */
134 #define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */
135 #define UCR3_REF25 (1<<3) /* Ref freq 25 MHz */
136 #define UCR3_REF30 (1<<2) /* Ref Freq 30 MHz */
137 #define UCR3_INVT (1<<1) /* Inverted Infrared transmission */
138 #define UCR3_BPEN (1<<0) /* Preset registers enable */
139 #define UCR4_CTSTL_32 (32<<10) /* CTS trigger level (32 chars) */
140 #define UCR4_INVR (1<<9) /* Inverted infrared reception */
141 #define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */
142 #define UCR4_WKEN (1<<7) /* Wake interrupt enable */
143 #define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */
144 #define UCR4_IRSC (1<<5) /* IR special case */
145 #define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */
146 #define UCR4_BKEN (1<<2) /* Break condition interrupt enable */
147 #define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */
148 #define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */
149 #define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */
150 #define UFCR_RFDIV (7<<7) /* Reference freq divider mask */
151 #define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */
152 #define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */
153 #define USR1_RTSS (1<<14) /* RTS pin status */
154 #define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */
155 #define USR1_RTSD (1<<12) /* RTS delta */
156 #define USR1_ESCF (1<<11) /* Escape seq interrupt flag */
157 #define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */
158 #define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */
159 #define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */
160 #define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */
161 #define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */
162 #define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */
163 #define USR2_ADET (1<<15) /* Auto baud rate detect complete */
164 #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */
165 #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */
166 #define USR2_IDLE (1<<12) /* Idle condition */
167 #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */
168 #define USR2_WAKE (1<<7) /* Wake */
169 #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */
170 #define USR2_TXDC (1<<3) /* Transmitter complete */
171 #define USR2_BRCD (1<<2) /* Break condition */
172 #define USR2_ORE (1<<1) /* Overrun error */
173 #define USR2_RDR (1<<0) /* Recv data ready */
174 #define UTS_FRCPERR (1<<13) /* Force parity error */
175 #define UTS_LOOP (1<<12) /* Loop tx and rx */
176 #define UTS_TXEMPTY (1<<6) /* TxFIFO empty */
177 #define UTS_RXEMPTY (1<<5) /* RxFIFO empty */
178 #define UTS_TXFULL (1<<4) /* TxFIFO full */
179 #define UTS_RXFULL (1<<3) /* RxFIFO full */
180 #define UTS_SOFTRST (1<<0) /* Software reset */
182 DECLARE_GLOBAL_DATA_PTR;
184 void serial_setbrg (void)
186 u32 clk = imx_get_uartclk();
189 gd->baudrate = CONFIG_BAUDRATE;
191 __REG(UART_PHYS + UFCR) = 4 << 7; /* divide input clock by 2 */
192 __REG(UART_PHYS + UBIR) = 0xf;
193 __REG(UART_PHYS + UBMR) = clk / (2 * gd->baudrate);
197 int serial_getc (void)
199 while (__REG(UART_PHYS + UTS) & UTS_RXEMPTY)
201 return (__REG(UART_PHYS + URXD) & URXD_RX_DATA); /* mask out status from upper word */
204 void serial_putc (const char c)
206 __REG(UART_PHYS + UTXD) = c;
208 /* wait for transmitter to be ready */
209 while (!(__REG(UART_PHYS + UTS) & UTS_TXEMPTY))
212 /* If \n, also do \r */
218 * Test whether a character is in the RX buffer
220 int serial_tstc (void)
222 /* If receive fifo is empty, return false */
223 if (__REG(UART_PHYS + UTS) & UTS_RXEMPTY)
229 serial_puts (const char *s)
237 * Initialise the serial port with the given baudrate. The settings
238 * are always 8 data bits, no parity, 1 stop bit, no start bits.
241 int serial_init (void)
243 __REG(UART_PHYS + UCR1) = 0x0;
244 __REG(UART_PHYS + UCR2) = 0x0;
246 while (!(__REG(UART_PHYS + UCR2) & UCR2_SRST));
248 __REG(UART_PHYS + UCR3) = 0x0704;
249 __REG(UART_PHYS + UCR4) = 0x8000;
250 __REG(UART_PHYS + UESC) = 0x002b;
251 __REG(UART_PHYS + UTIM) = 0x0;
253 __REG(UART_PHYS + UTS) = 0x0;
257 __REG(UART_PHYS + UCR2) = UCR2_WS | UCR2_IRTS | UCR2_RXEN | UCR2_TXEN | UCR2_SRST;
259 __REG(UART_PHYS + UCR1) = UCR1_UARTEN;