1 /***********************************************************************
4 * DENX Software Engineering
5 * Wolfgang Denk, wd@denx.de
8 * Simple 16550A serial driver
10 * Originally from linux source (drivers/char/ps2ser.c)
12 * Used by the PS/2 multiplexer driver (ps2mult.c)
14 ***********************************************************************/
18 #ifdef CONFIG_PS2SERIAL
21 #include <asm/atomic.h>
27 DECLARE_GLOBAL_DATA_PTR;
31 #define PS2SER_BAUD 57600
34 #if CONFIG_PS2SERIAL == 1
35 #define PSC_BASE MPC5XXX_PSC1
36 #elif CONFIG_PS2SERIAL == 2
37 #define PSC_BASE MPC5XXX_PSC2
38 #elif CONFIG_PS2SERIAL == 3
39 #define PSC_BASE MPC5XXX_PSC3
40 #elif defined(CONFIG_MGT5100)
41 #error CONFIG_PS2SERIAL must be in 1, 2 or 3
42 #elif CONFIG_PS2SERIAL == 4
43 #define PSC_BASE MPC5XXX_PSC4
44 #elif CONFIG_PS2SERIAL == 5
45 #define PSC_BASE MPC5XXX_PSC5
46 #elif CONFIG_PS2SERIAL == 6
47 #define PSC_BASE MPC5XXX_PSC6
49 #error CONFIG_PS2SERIAL must be in 1 ... 6
52 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
54 #if CONFIG_PS2SERIAL == 1
55 #define COM_BASE (CFG_CCSRBAR+0x4500)
56 #elif CONFIG_PS2SERIAL == 2
57 #define COM_BASE (CFG_CCSRBAR+0x4600)
59 #error CONFIG_PS2SERIAL must be in 1 ... 2
62 #endif /* CONFIG_MPC5xxx / CONFIG_MPC8540 / other */
64 static int ps2ser_getc_hw(void);
65 static void ps2ser_interrupt(void *dev_id);
67 extern struct serial_state rs_table[]; /* in serial.c */
68 #if !defined(CONFIG_MPC5xxx) && !defined(CONFIG_MPC8540) && !defined(CONFIG_MPC8541) && !defined(CONFIG_MPC8555)
69 static struct serial_state *state;
72 static u_char ps2buf[PS2BUF_SIZE];
73 static atomic_t ps2buf_cnt;
74 static int ps2buf_in_idx;
75 static int ps2buf_out_idx;
80 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
81 unsigned long baseclk;
85 psc->command = PSC_SEL_MODE_REG_1;
87 /* select clock sources */
88 #if defined(CONFIG_MGT5100)
89 psc->psc_clock_select = 0xdd00;
90 baseclk = (CFG_MPC5XXX_CLKIN + 16) / 32;
91 #elif defined(CONFIG_MPC5200)
92 psc->psc_clock_select = 0;
93 baseclk = (gd->ipb_clk + 16) / 32;
96 /* switch to UART mode */
99 /* configure parity, bit length and so on */
100 #if defined(CONFIG_MGT5100)
101 psc->mode = PSC_MODE_ERR | PSC_MODE_8_BITS | PSC_MODE_PARNONE;
102 #elif defined(CONFIG_MPC5200)
103 psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
105 psc->mode = PSC_MODE_ONE_STOP;
107 /* set up UART divisor */
108 div = (baseclk + (PS2SER_BAUD/2)) / PS2SER_BAUD;
109 psc->ctur = (div >> 8) & 0xff;
110 psc->ctlr = div & 0xff;
112 /* disable all interrupts */
115 /* reset and enable Rx/Tx */
116 psc->command = PSC_RST_RX;
117 psc->command = PSC_RST_TX;
118 psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;
123 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
124 int ps2ser_init(void)
126 NS16550_t com_port = (NS16550_t)COM_BASE;
128 com_port->ier = 0x00;
129 com_port->lcr = LCR_BKSE | LCR_8N1;
130 com_port->dll = (CFG_NS16550_CLK / 16 / PS2SER_BAUD) & 0xff;
131 com_port->dlm = ((CFG_NS16550_CLK / 16 / PS2SER_BAUD) >> 8) & 0xff;
132 com_port->lcr = LCR_8N1;
133 com_port->mcr = (MCR_DTR | MCR_RTS);
134 com_port->fcr = (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR);
139 #else /* !CONFIG_MPC5xxx && !CONFIG_MPC8540 / other */
141 static inline unsigned int ps2ser_in(int offset)
143 return readb((unsigned long) state->iomem_base + offset);
146 static inline void ps2ser_out(int offset, int value)
148 writeb(value, (unsigned long) state->iomem_base + offset);
151 int ps2ser_init(void)
156 state = rs_table + CONFIG_PS2SERIAL;
158 quot = state->baud_base / PS2SER_BAUD;
159 cval = 0x3; /* 8N1 - 8 data bits, no parity bits, 1 stop bit */
161 /* Set speed, enable interrupts, enable FIFO
163 ps2ser_out(UART_LCR, cval | UART_LCR_DLAB);
164 ps2ser_out(UART_DLL, quot & 0xff);
165 ps2ser_out(UART_DLM, quot >> 8);
166 ps2ser_out(UART_LCR, cval);
167 ps2ser_out(UART_IER, UART_IER_RDI);
168 ps2ser_out(UART_MCR, UART_MCR_OUT2 | UART_MCR_DTR | UART_MCR_RTS);
170 UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
172 /* If we read 0xff from the LSR, there is no UART here
174 if (ps2ser_in(UART_LSR) == 0xff) {
175 printf ("ps2ser.c: no UART found\n");
179 irq_install_handler(state->irq, ps2ser_interrupt, NULL);
183 #endif /* CONFIG_MPC5xxx / CONFIG_MPC8540 / other */
185 void ps2ser_putc(int chr)
187 #ifdef CONFIG_MPC5xxx
188 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
189 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
190 NS16550_t com_port = (NS16550_t)COM_BASE;
193 printf(">>>> 0x%02x\n", chr);
196 #ifdef CONFIG_MPC5xxx
197 while (!(psc->psc_status & PSC_SR_TXRDY));
199 psc->psc_buffer_8 = chr;
200 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
201 while ((com_port->lsr & LSR_THRE) == 0);
204 while (!(ps2ser_in(UART_LSR) & UART_LSR_THRE));
206 ps2ser_out(UART_TX, chr);
210 static int ps2ser_getc_hw(void)
212 #ifdef CONFIG_MPC5xxx
213 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
214 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
215 NS16550_t com_port = (NS16550_t)COM_BASE;
219 #ifdef CONFIG_MPC5xxx
220 if (psc->psc_status & PSC_SR_RXRDY) {
221 res = (psc->psc_buffer_8);
223 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
224 if (com_port->lsr & LSR_DR) {
228 if (ps2ser_in(UART_LSR) & UART_LSR_DR) {
229 res = (ps2ser_in(UART_RX));
236 int ps2ser_getc(void)
245 flags = disable_interrupts();
248 if (atomic_read(&ps2buf_cnt) != 0) {
249 chr = ps2buf[ps2buf_out_idx++];
250 ps2buf_out_idx &= (PS2BUF_SIZE - 1);
251 atomic_dec(&ps2buf_cnt);
253 chr = ps2ser_getc_hw();
258 if (flags) enable_interrupts();
261 printf("0x%02x\n", chr);
267 int ps2ser_check(void)
271 flags = disable_interrupts();
272 ps2ser_interrupt(NULL);
273 if (flags) enable_interrupts();
275 return atomic_read(&ps2buf_cnt);
278 static void ps2ser_interrupt(void *dev_id)
280 #ifdef CONFIG_MPC5xxx
281 volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
282 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
283 NS16550_t com_port = (NS16550_t)COM_BASE;
289 chr = ps2ser_getc_hw();
290 #ifdef CONFIG_MPC5xxx
291 status = psc->psc_status;
292 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
293 status = com_port->lsr;
295 status = ps2ser_in(UART_IIR);
297 if (chr < 0) continue;
299 if (atomic_read(&ps2buf_cnt) < PS2BUF_SIZE) {
300 ps2buf[ps2buf_in_idx++] = chr;
301 ps2buf_in_idx &= (PS2BUF_SIZE - 1);
302 atomic_inc(&ps2buf_cnt);
304 printf ("ps2ser.c: buffer overflow\n");
306 #ifdef CONFIG_MPC5xxx
307 } while (status & PSC_SR_RXRDY);
308 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
309 } while (status & LSR_DR);
311 } while (status & UART_IIR_RDI);
314 if (atomic_read(&ps2buf_cnt)) {
315 ps2mult_callback(atomic_read(&ps2buf_cnt));
319 #endif /* CONFIG_PS2SERIAL */