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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 | /* * (c) 2004 Sascha Hauer <sascha@saschahauer.de> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include <common.h> #if defined (CONFIG_IMX) #include <asm/arch/imx-regs.h> #ifndef CONFIG_IMX_SERIAL_NONE #if defined CONFIG_IMX_SERIAL1 #define UART_BASE IMX_UART1_BASE #elif defined CONFIG_IMX_SERIAL2 #define UART_BASE IMX_UART2_BASE #else #error "define CONFIG_IMX_SERIAL1, CONFIG_IMX_SERIAL2 or CONFIG_IMX_SERIAL_NONE" #endif struct imx_serial { volatile uint32_t urxd[16]; volatile uint32_t utxd[16]; volatile uint32_t ucr1; volatile uint32_t ucr2; volatile uint32_t ucr3; volatile uint32_t ucr4; volatile uint32_t ufcr; volatile uint32_t usr1; volatile uint32_t usr2; volatile uint32_t uesc; volatile uint32_t utim; volatile uint32_t ubir; volatile uint32_t ubmr; volatile uint32_t ubrc; volatile uint32_t bipr[4]; volatile uint32_t bmpr[4]; volatile uint32_t uts; }; void serial_setbrg (void) { serial_init(); } extern void imx_gpio_mode(int gpio_mode); /* * Initialise the serial port with the given baudrate. The settings * are always 8 data bits, no parity, 1 stop bit, no start bits. * */ int serial_init (void) { volatile struct imx_serial* base = (struct imx_serial *)UART_BASE; #ifdef CONFIG_IMX_SERIAL1 imx_gpio_mode(PC11_PF_UART1_TXD); imx_gpio_mode(PC12_PF_UART1_RXD); #else imx_gpio_mode(PB30_PF_UART2_TXD); imx_gpio_mode(PB31_PF_UART2_RXD); #endif /* Disable UART */ base->ucr1 &= ~UCR1_UARTEN; /* Set to default POR state */ base->ucr1 = 0x00000004; base->ucr2 = 0x00000000; base->ucr3 = 0x00000000; base->ucr4 = 0x00008040; base->uesc = 0x0000002B; base->utim = 0x00000000; base->ubir = 0x00000000; base->ubmr = 0x00000000; base->uts = 0x00000000; /* Set clocks */ base->ucr4 |= UCR4_REF16; /* Configure FIFOs */ base->ufcr = 0xa81; /* Set the numerator value minus one of the BRM ratio */ base->ubir = (CONFIG_BAUDRATE / 100) - 1; /* Set the denominator value minus one of the BRM ratio */ base->ubmr = 10000 - 1; /* Set to 8N1 */ base->ucr2 &= ~UCR2_PREN; base->ucr2 |= UCR2_WS; base->ucr2 &= ~UCR2_STPB; /* Ignore RTS */ base->ucr2 |= UCR2_IRTS; /* Enable UART */ base->ucr1 |= UCR1_UARTEN | UCR1_UARTCLKEN; /* Enable FIFOs */ base->ucr2 |= UCR2_SRST | UCR2_RXEN | UCR2_TXEN; /* Clear status flags */ base->usr2 |= USR2_ADET | USR2_DTRF | USR2_IDLE | USR2_IRINT | USR2_WAKE | USR2_RTSF | USR2_BRCD | USR2_ORE | USR2_RDR; /* Clear status flags */ base->usr1 |= USR1_PARITYERR | USR1_RTSD | USR1_ESCF | USR1_FRAMERR | USR1_AIRINT | USR1_AWAKE; return (0); } /* * Read a single byte from the serial port. Returns 1 on success, 0 * otherwise. When the function is successful, the character read is * written into its argument c. */ int serial_getc (void) { volatile struct imx_serial* base = (struct imx_serial *)UART_BASE; unsigned char ch; while(base->uts & UTS_RXEMPTY); ch = (char)base->urxd[0]; return ch; } #ifdef CONFIG_HWFLOW static int hwflow = 0; /* turned off by default */ int hwflow_onoff(int on) { } #endif /* * Output a single byte to the serial port. */ void serial_putc (const char c) { volatile struct imx_serial* base = (struct imx_serial *)UART_BASE; /* Wait for Tx FIFO not full */ while (base->uts & UTS_TXFULL); base->utxd[0] = c; /* If \n, also do \r */ if (c == '\n') serial_putc ('\r'); } /* * Test whether a character is in the RX buffer */ int serial_tstc (void) { volatile struct imx_serial* base = (struct imx_serial *)UART_BASE; /* If receive fifo is empty, return false */ if (base->uts & UTS_RXEMPTY) return 0; return 1; } void serial_puts (const char *s) { while (*s) { serial_putc (*s++); } } #endif /* CONFIG_IMX_SERIAL_NONE */ #endif /* defined CONFIG_IMX */ |