3 * originally from linux source (arch/powerpc/boot/ns16550.c)
4 * modified to use CONFIG_SYS_ISA_MEM and new defines
10 #include <linux/types.h>
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 | \
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)
29 #define serial_out(x, y) writeb(x, y)
30 #define serial_in(y) readb(y)
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))
38 #ifndef CONFIG_SYS_NS16550_IER
39 #define CONFIG_SYS_NS16550_IER 0x00
40 #endif /* CONFIG_SYS_NS16550_IER */
42 void NS16550_init(NS16550_t com_port, int baud_divisor)
44 #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_OMAP34XX))
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.
50 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | 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);
60 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
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*/
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)
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);
90 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
91 void NS16550_reinit(NS16550_t com_port, int baud_divisor)
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);
105 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
107 void NS16550_putc(NS16550_t com_port, char c)
109 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
111 serial_out(c, &com_port->thr);
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
123 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
124 char NS16550_getc(NS16550_t com_port)
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);
133 return serial_in(&com_port->rbr);
136 int NS16550_tstc(NS16550_t com_port)
138 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
141 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */