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_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))
37 #ifdef CONFIG_SERIAL_HW_FLOW_CONTROL
38 #define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE)
40 #define UART_MCRVAL (UART_MCR_RTS)
44 #ifndef CONFIG_SYS_NS16550_IER
45 #define CONFIG_SYS_NS16550_IER 0x00
46 #endif /* CONFIG_SYS_NS16550_IER */
48 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
50 const unsigned int mode_x_div = 16;
52 #ifdef CONFIG_OMAP1510
53 /* If can't cleanly clock 115200 set div to 1 */
54 if ((clock == 12000000) && (baudrate == 115200)) {
55 port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */
56 return 1; /* return 1 for base divisor */
58 port->osc_12m_sel = 0; /* clear if previsouly set */
61 return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
64 void NS16550_init(NS16550_t com_port, int baud_divisor)
66 #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_OMAP34XX))
68 * On some OMAP3 devices when UART3 is configured for boot mode before
69 * SPL starts only THRE bit is set. We have to empty the transmitter
70 * before initialization starts.
72 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE))
74 serial_out(UART_LCR_DLAB, &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 serial_out(0, &com_port->mdr1);
82 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
85 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
86 #if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \
87 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
88 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
90 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
91 serial_out(0, &com_port->dll);
92 serial_out(0, &com_port->dlm);
93 serial_out(UART_LCRVAL, &com_port->lcr);
94 serial_out(UART_MCRVAL, &com_port->mcr);
95 serial_out(UART_FCRVAL, &com_port->fcr);
96 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
97 serial_out(baud_divisor & 0xff, &com_port->dll);
98 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
99 serial_out(UART_LCRVAL, &com_port->lcr);
100 #if defined(CONFIG_OMAP) || \
101 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \
102 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
104 /* /16 is proper to hit 115200 with 48MHz */
105 serial_out(0, &com_port->mdr1);
106 #endif /* CONFIG_OMAP */
107 #if defined(CONFIG_SOC_KEYSTONE)
108 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC);
112 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
113 void NS16550_reinit(NS16550_t com_port, int baud_divisor)
115 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
116 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
117 serial_out(0, &com_port->dll);
118 serial_out(0, &com_port->dlm);
119 serial_out(UART_LCRVAL, &com_port->lcr);
120 serial_out(UART_MCRVAL, &com_port->mcr);
121 serial_out(UART_FCRVAL, &com_port->fcr);
122 serial_out(UART_LCR_BKSE, &com_port->lcr);
123 serial_out(baud_divisor & 0xff, &com_port->dll);
124 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
125 serial_out(UART_LCRVAL, &com_port->lcr);
127 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
129 void NS16550_putc(NS16550_t com_port, char c)
131 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
133 serial_out(c, &com_port->thr);
136 * Call watchdog_reset() upon newline. This is done here in putc
137 * since the environment code uses a single puts() to print the complete
138 * environment upon "printenv". So we can't put this watchdog call
145 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
146 char NS16550_getc(NS16550_t com_port)
148 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
149 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
150 extern void usbtty_poll(void);
155 return serial_in(&com_port->rbr);
158 int NS16550_tstc(NS16550_t com_port)
160 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
163 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */