/* * (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> #include <asm/arch/imx-regs.h> #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; }; DECLARE_GLOBAL_DATA_PTR; 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; unsigned int ufcr_rfdiv; unsigned int refclk; #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 baud rate. * * baud * 16 x * --------- = - * refclk y * * x - 1 = UBIR * y - 1 = UBMR * * each register is 16 bits wide. refclk max is 96 MHz * */ ufcr_rfdiv = ((base->ufcr) & UFCR_RFDIV) >> 7; if (ufcr_rfdiv == 6) ufcr_rfdiv = 7; else ufcr_rfdiv = 6 - ufcr_rfdiv; refclk = get_PERCLK1(); refclk /= ufcr_rfdiv; /* Set the numerator value minus one of the BRM ratio */ base->ubir = (gd->baudrate / 100) - 1; /* Set the denominator value minus one of the BRM ratio */ base->ubmr = (refclk/(16 * 100)) - 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; /* 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++); } }