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_SOC_KEYSTONE) 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 #undef UART_MCRVAL 37 #ifdef CONFIG_SERIAL_HW_FLOW_CONTROL 38 #define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE) 39 #else 40 #define UART_MCRVAL (UART_MCR_RTS) 41 #endif 42 #endif 43 44 #ifndef CONFIG_SYS_NS16550_IER 45 #define CONFIG_SYS_NS16550_IER 0x00 46 #endif /* CONFIG_SYS_NS16550_IER */ 47 48 void NS16550_init(NS16550_t com_port, int baud_divisor) 49 { 50 #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_OMAP34XX)) 51 /* 52 * On some OMAP3 devices when UART3 is configured for boot mode before 53 * SPL starts only THRE bit is set. We have to empty the transmitter 54 * before initialization starts. 55 */ 56 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE)) 57 == UART_LSR_THRE) { 58 serial_out(UART_LCR_DLAB, &com_port->lcr); 59 serial_out(baud_divisor & 0xff, &com_port->dll); 60 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 61 serial_out(UART_LCRVAL, &com_port->lcr); 62 serial_out(0, &com_port->mdr1); 63 } 64 #endif 65 66 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT)) 67 ; 68 69 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 70 #if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \ 71 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX) 72 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ 73 #endif 74 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 75 serial_out(0, &com_port->dll); 76 serial_out(0, &com_port->dlm); 77 serial_out(UART_LCRVAL, &com_port->lcr); 78 serial_out(UART_MCRVAL, &com_port->mcr); 79 serial_out(UART_FCRVAL, &com_port->fcr); 80 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 81 serial_out(baud_divisor & 0xff, &com_port->dll); 82 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 83 serial_out(UART_LCRVAL, &com_port->lcr); 84 #if defined(CONFIG_OMAP) || \ 85 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \ 86 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX) 87 88 /* /16 is proper to hit 115200 with 48MHz */ 89 serial_out(0, &com_port->mdr1); 90 #endif /* CONFIG_OMAP */ 91 #if defined(CONFIG_SOC_KEYSTONE) 92 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC); 93 #endif 94 } 95 96 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 97 void NS16550_reinit(NS16550_t com_port, int baud_divisor) 98 { 99 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 100 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 101 serial_out(0, &com_port->dll); 102 serial_out(0, &com_port->dlm); 103 serial_out(UART_LCRVAL, &com_port->lcr); 104 serial_out(UART_MCRVAL, &com_port->mcr); 105 serial_out(UART_FCRVAL, &com_port->fcr); 106 serial_out(UART_LCR_BKSE, &com_port->lcr); 107 serial_out(baud_divisor & 0xff, &com_port->dll); 108 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 109 serial_out(UART_LCRVAL, &com_port->lcr); 110 } 111 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 112 113 void NS16550_putc(NS16550_t com_port, char c) 114 { 115 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0) 116 ; 117 serial_out(c, &com_port->thr); 118 119 /* 120 * Call watchdog_reset() upon newline. This is done here in putc 121 * since the environment code uses a single puts() to print the complete 122 * environment upon "printenv". So we can't put this watchdog call 123 * in puts(). 124 */ 125 if (c == '\n') 126 WATCHDOG_RESET(); 127 } 128 129 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 130 char NS16550_getc(NS16550_t com_port) 131 { 132 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) { 133 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY) 134 extern void usbtty_poll(void); 135 usbtty_poll(); 136 #endif 137 WATCHDOG_RESET(); 138 } 139 return serial_in(&com_port->rbr); 140 } 141 142 int NS16550_tstc(NS16550_t com_port) 143 { 144 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0; 145 } 146 147 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 148