1 /* 2 * COM1 NS16550 support 3 * originally from linux source (arch/powerpc/boot/ns16550.c) 4 * modified to use CONFIG_SYS_ISA_MEM and new defines 5 */ 6 7 #include <config.h> 8 #include <ns16550.h> 9 #include <watchdog.h> 10 #include <linux/types.h> 11 #include <asm/io.h> 12 13 #define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */ 14 #define UART_MCRVAL (UART_MCR_DTR | \ 15 UART_MCR_RTS) /* RTS/DTR */ 16 #define UART_FCRVAL (UART_FCR_FIFO_EN | \ 17 UART_FCR_RXSR | \ 18 UART_FCR_TXSR) /* Clear & enable FIFOs */ 19 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 20 #define serial_out(x, y) outb(x, (ulong)y) 21 #define serial_in(y) inb((ulong)y) 22 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0) 23 #define serial_out(x, y) out_be32(y, x) 24 #define serial_in(y) in_be32(y) 25 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0) 26 #define serial_out(x, y) out_le32(y, x) 27 #define serial_in(y) in_le32(y) 28 #else 29 #define serial_out(x, y) writeb(x, y) 30 #define serial_in(y) readb(y) 31 #endif 32 33 #if defined(CONFIG_K2HK_EVM) 34 #define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0 35 #define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 0)) 36 #endif 37 38 #ifndef CONFIG_SYS_NS16550_IER 39 #define CONFIG_SYS_NS16550_IER 0x00 40 #endif /* CONFIG_SYS_NS16550_IER */ 41 42 void NS16550_init(NS16550_t com_port, int baud_divisor) 43 { 44 #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_OMAP34XX)) 45 /* 46 * On some OMAP3 devices when UART3 is configured for boot mode before 47 * SPL starts only THRE bit is set. We have to empty the transmitter 48 * before initialization starts. 49 */ 50 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE)) 51 == UART_LSR_THRE) { 52 serial_out(UART_LCR_DLAB, &com_port->lcr); 53 serial_out(baud_divisor & 0xff, &com_port->dll); 54 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 55 serial_out(UART_LCRVAL, &com_port->lcr); 56 serial_out(0, &com_port->mdr1); 57 } 58 #endif 59 60 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT)) 61 ; 62 63 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 64 #if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \ 65 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX) 66 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ 67 #endif 68 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 69 serial_out(0, &com_port->dll); 70 serial_out(0, &com_port->dlm); 71 serial_out(UART_LCRVAL, &com_port->lcr); 72 serial_out(UART_MCRVAL, &com_port->mcr); 73 serial_out(UART_FCRVAL, &com_port->fcr); 74 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 75 serial_out(baud_divisor & 0xff, &com_port->dll); 76 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 77 serial_out(UART_LCRVAL, &com_port->lcr); 78 #if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \ 79 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \ 80 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX) 81 82 /* /16 is proper to hit 115200 with 48MHz */ 83 serial_out(0, &com_port->mdr1); 84 #endif /* CONFIG_OMAP */ 85 #if defined(CONFIG_K2HK_EVM) 86 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC); 87 #endif 88 } 89 90 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 91 void NS16550_reinit(NS16550_t com_port, int baud_divisor) 92 { 93 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 94 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 95 serial_out(0, &com_port->dll); 96 serial_out(0, &com_port->dlm); 97 serial_out(UART_LCRVAL, &com_port->lcr); 98 serial_out(UART_MCRVAL, &com_port->mcr); 99 serial_out(UART_FCRVAL, &com_port->fcr); 100 serial_out(UART_LCR_BKSE, &com_port->lcr); 101 serial_out(baud_divisor & 0xff, &com_port->dll); 102 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 103 serial_out(UART_LCRVAL, &com_port->lcr); 104 } 105 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 106 107 void NS16550_putc(NS16550_t com_port, char c) 108 { 109 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0) 110 ; 111 serial_out(c, &com_port->thr); 112 113 /* 114 * Call watchdog_reset() upon newline. This is done here in putc 115 * since the environment code uses a single puts() to print the complete 116 * environment upon "printenv". So we can't put this watchdog call 117 * in puts(). 118 */ 119 if (c == '\n') 120 WATCHDOG_RESET(); 121 } 122 123 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 124 char NS16550_getc(NS16550_t com_port) 125 { 126 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) { 127 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY) 128 extern void usbtty_poll(void); 129 usbtty_poll(); 130 #endif 131 WATCHDOG_RESET(); 132 } 133 return serial_in(&com_port->rbr); 134 } 135 136 int NS16550_tstc(NS16550_t com_port) 137 { 138 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0; 139 } 140 141 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 142