1 /***********************************************************************
3 * (C) Copyright 2004-2009
4 * DENX Software Engineering
5 * Wolfgang Denk, wd@denx.de
7 * Simple 16550A serial driver
9 * Originally from linux source (drivers/char/ps2ser.c)
11 * Used by the PS/2 multiplexer driver (ps2mult.c)
13 ***********************************************************************/
18 #include <asm/atomic.h>
20 /* This is needed for ns16550.h */
21 #ifndef CONFIG_SYS_NS16550_REG_SIZE
22 #define CONFIG_SYS_NS16550_REG_SIZE 1
26 DECLARE_GLOBAL_DATA_PTR;
30 #define PS2SER_BAUD 57600
33 #if CONFIG_PS2SERIAL == 1
34 #define PSC_BASE MPC5XXX_PSC1
35 #elif CONFIG_PS2SERIAL == 2
36 #define PSC_BASE MPC5XXX_PSC2
37 #elif CONFIG_PS2SERIAL == 3
38 #define PSC_BASE MPC5XXX_PSC3
39 #elif CONFIG_PS2SERIAL == 4
40 #define PSC_BASE MPC5XXX_PSC4
41 #elif CONFIG_PS2SERIAL == 5
42 #define PSC_BASE MPC5XXX_PSC5
43 #elif CONFIG_PS2SERIAL == 6
44 #define PSC_BASE MPC5XXX_PSC6
46 #error CONFIG_PS2SERIAL must be in 1 ... 6
51 #if CONFIG_PS2SERIAL == 1
52 #define COM_BASE (CONFIG_SYS_CCSRBAR+0x4500)
53 #elif CONFIG_PS2SERIAL == 2
54 #define COM_BASE (CONFIG_SYS_CCSRBAR+0x4600)
56 #error CONFIG_PS2SERIAL must be in 1 ... 2
59 #endif /* CONFIG_MPC5xxx / other */
61 static int ps2ser_getc_hw(void);
62 static void ps2ser_interrupt(void *dev_id);
64 extern struct serial_state rs_table[]; /* in serial.c */
66 static u_char ps2buf[PS2BUF_SIZE];
67 static atomic_t ps2buf_cnt;
68 static int ps2buf_in_idx;
69 static int ps2buf_out_idx;
74 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
75 unsigned long baseclk;
79 psc->command = PSC_SEL_MODE_REG_1;
81 /* select clock sources */
82 psc->psc_clock_select = 0;
83 baseclk = (gd->ipb_clk + 16) / 32;
85 /* switch to UART mode */
88 /* configure parity, bit length and so on */
89 psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
90 psc->mode = PSC_MODE_ONE_STOP;
92 /* set up UART divisor */
93 div = (baseclk + (PS2SER_BAUD/2)) / PS2SER_BAUD;
94 psc->ctur = (div >> 8) & 0xff;
95 psc->ctlr = div & 0xff;
97 /* disable all interrupts */
100 /* reset and enable Rx/Tx */
101 psc->command = PSC_RST_RX;
102 psc->command = PSC_RST_TX;
103 psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;
110 int ps2ser_init(void)
112 NS16550_t com_port = (NS16550_t)COM_BASE;
114 com_port->ier = 0x00;
115 com_port->lcr = UART_LCR_BKSE | UART_LCR_8N1;
116 com_port->dll = (CONFIG_SYS_NS16550_CLK / 16 / PS2SER_BAUD) & 0xff;
117 com_port->dlm = ((CONFIG_SYS_NS16550_CLK / 16 / PS2SER_BAUD) >> 8) & 0xff;
118 com_port->lcr = UART_LCR_8N1;
119 com_port->mcr = (UART_MCR_DTR | UART_MCR_RTS);
120 com_port->fcr = (UART_FCR_FIFO_EN | UART_FCR_RXSR | UART_FCR_TXSR);
125 #endif /* CONFIG_MPC5xxx / other */
127 void ps2ser_putc(int chr)
129 #ifdef CONFIG_MPC5xxx
130 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
132 NS16550_t com_port = (NS16550_t)COM_BASE;
134 debug(">>>> 0x%02x\n", chr);
136 #ifdef CONFIG_MPC5xxx
137 while (!(psc->psc_status & PSC_SR_TXRDY));
139 psc->psc_buffer_8 = chr;
141 while ((com_port->lsr & UART_LSR_THRE) == 0);
146 static int ps2ser_getc_hw(void)
148 #ifdef CONFIG_MPC5xxx
149 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
151 NS16550_t com_port = (NS16550_t)COM_BASE;
155 #ifdef CONFIG_MPC5xxx
156 if (psc->psc_status & PSC_SR_RXRDY) {
157 res = (psc->psc_buffer_8);
160 if (com_port->lsr & UART_LSR_DR) {
168 int ps2ser_getc(void)
175 flags = disable_interrupts();
178 if (atomic_read(&ps2buf_cnt) != 0) {
179 chr = ps2buf[ps2buf_out_idx++];
180 ps2buf_out_idx &= (PS2BUF_SIZE - 1);
181 atomic_dec(&ps2buf_cnt);
183 chr = ps2ser_getc_hw();
191 debug("0x%02x\n", chr);
196 int ps2ser_check(void)
200 flags = disable_interrupts();
201 ps2ser_interrupt(NULL);
202 if (flags) enable_interrupts();
204 return atomic_read(&ps2buf_cnt);
207 static void ps2ser_interrupt(void *dev_id)
209 #ifdef CONFIG_MPC5xxx
210 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
212 NS16550_t com_port = (NS16550_t)COM_BASE;
218 chr = ps2ser_getc_hw();
219 #ifdef CONFIG_MPC5xxx
220 status = psc->psc_status;
222 status = com_port->lsr;
224 if (chr < 0) continue;
226 if (atomic_read(&ps2buf_cnt) < PS2BUF_SIZE) {
227 ps2buf[ps2buf_in_idx++] = chr;
228 ps2buf_in_idx &= (PS2BUF_SIZE - 1);
229 atomic_inc(&ps2buf_cnt);
231 printf ("ps2ser.c: buffer overflow\n");
233 #ifdef CONFIG_MPC5xxx
234 } while (status & PSC_SR_RXRDY);
236 } while (status & UART_LSR_DR);
238 if (atomic_read(&ps2buf_cnt)) {
239 ps2mult_callback(atomic_read(&ps2buf_cnt));