2 * (c) 2004 Sascha Hauer <sascha@saschahauer.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
21 #if defined (CONFIG_IMX)
23 #include <asm/arch/imx-regs.h>
25 #ifndef CONFIG_IMX_SERIAL_NONE
27 #if defined CONFIG_IMX_SERIAL1
28 #define UART_BASE IMX_UART1_BASE
29 #elif defined CONFIG_IMX_SERIAL2
30 #define UART_BASE IMX_UART2_BASE
32 #error "define CONFIG_IMX_SERIAL1, CONFIG_IMX_SERIAL2 or CONFIG_IMX_SERIAL_NONE"
36 volatile uint32_t urxd[16];
37 volatile uint32_t utxd[16];
38 volatile uint32_t ucr1;
39 volatile uint32_t ucr2;
40 volatile uint32_t ucr3;
41 volatile uint32_t ucr4;
42 volatile uint32_t ufcr;
43 volatile uint32_t usr1;
44 volatile uint32_t usr2;
45 volatile uint32_t uesc;
46 volatile uint32_t utim;
47 volatile uint32_t ubir;
48 volatile uint32_t ubmr;
49 volatile uint32_t ubrc;
50 volatile uint32_t bipr[4];
51 volatile uint32_t bmpr[4];
52 volatile uint32_t uts;
55 DECLARE_GLOBAL_DATA_PTR;
57 void serial_setbrg (void)
62 extern void imx_gpio_mode(int gpio_mode);
65 * Initialise the serial port with the given baudrate. The settings
66 * are always 8 data bits, no parity, 1 stop bit, no start bits.
69 int serial_init (void)
71 volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
72 unsigned int ufcr_rfdiv;
75 #ifdef CONFIG_IMX_SERIAL1
76 imx_gpio_mode(PC11_PF_UART1_TXD);
77 imx_gpio_mode(PC12_PF_UART1_RXD);
79 imx_gpio_mode(PB30_PF_UART2_TXD);
80 imx_gpio_mode(PB31_PF_UART2_RXD);
84 base->ucr1 &= ~UCR1_UARTEN;
86 /* Set to default POR state */
88 base->ucr1 = 0x00000004;
89 base->ucr2 = 0x00000000;
90 base->ucr3 = 0x00000000;
91 base->ucr4 = 0x00008040;
92 base->uesc = 0x0000002B;
93 base->utim = 0x00000000;
94 base->ubir = 0x00000000;
95 base->ubmr = 0x00000000;
96 base->uts = 0x00000000;
98 base->ucr4 |= UCR4_REF16;
100 /* Configure FIFOs */
103 /* set the baud rate.
112 * each register is 16 bits wide. refclk max is 96 MHz
116 ufcr_rfdiv = ((base->ufcr) & UFCR_RFDIV) >> 7;
120 ufcr_rfdiv = 6 - ufcr_rfdiv;
122 refclk = get_PERCLK1();
123 refclk /= ufcr_rfdiv;
125 /* Set the numerator value minus one of the BRM ratio */
126 base->ubir = (gd->baudrate / 100) - 1;
128 /* Set the denominator value minus one of the BRM ratio */
129 base->ubmr = (refclk/(16 * 100)) - 1;
132 base->ucr2 &= ~UCR2_PREN;
133 base->ucr2 |= UCR2_WS;
134 base->ucr2 &= ~UCR2_STPB;
137 base->ucr2 |= UCR2_IRTS;
140 base->ucr1 |= UCR1_UARTEN | UCR1_UARTCLKEN;
143 base->ucr2 |= UCR2_SRST | UCR2_RXEN | UCR2_TXEN;
145 /* Clear status flags */
146 base->usr2 |= USR2_ADET |
155 /* Clear status flags */
156 base->usr1 |= USR1_PARITYERR |
166 * Read a single byte from the serial port. Returns 1 on success, 0
167 * otherwise. When the function is successful, the character read is
168 * written into its argument c.
170 int serial_getc (void)
172 volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
175 while(base->uts & UTS_RXEMPTY);
177 ch = (char)base->urxd[0];
183 static int hwflow = 0; /* turned off by default */
184 int hwflow_onoff(int on)
190 * Output a single byte to the serial port.
192 void serial_putc (const char c)
194 volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
196 /* Wait for Tx FIFO not full */
197 while (base->uts & UTS_TXFULL);
201 /* If \n, also do \r */
207 * Test whether a character is in the RX buffer
209 int serial_tstc (void)
211 volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
213 /* If receive fifo is empty, return false */
214 if (base->uts & UTS_RXEMPTY)
220 serial_puts (const char *s)
226 #endif /* CONFIG_IMX_SERIAL_NONE */
227 #endif /* defined CONFIG_IMX */