1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
|
/***********************************************************************
*
* (C) Copyright 2004-2009
* DENX Software Engineering
* Wolfgang Denk, wd@denx.de
*
* Simple 16550A serial driver
*
* Originally from linux source (drivers/char/ps2ser.c)
*
* Used by the PS/2 multiplexer driver (ps2mult.c)
*
***********************************************************************/
#include <common.h>
#include <asm/io.h>
#include <asm/atomic.h>
#include <ps2mult.h>
/* This is needed for ns16550.h */
#ifndef CONFIG_SYS_NS16550_REG_SIZE
#define CONFIG_SYS_NS16550_REG_SIZE 1
#endif
#include <ns16550.h>
DECLARE_GLOBAL_DATA_PTR;
/* #define DEBUG */
#define PS2SER_BAUD 57600
#ifdef CONFIG_MPC5xxx
#if CONFIG_PS2SERIAL == 1
#define PSC_BASE MPC5XXX_PSC1
#elif CONFIG_PS2SERIAL == 2
#define PSC_BASE MPC5XXX_PSC2
#elif CONFIG_PS2SERIAL == 3
#define PSC_BASE MPC5XXX_PSC3
#elif defined(CONFIG_MGT5100)
#error CONFIG_PS2SERIAL must be in 1, 2 or 3
#elif CONFIG_PS2SERIAL == 4
#define PSC_BASE MPC5XXX_PSC4
#elif CONFIG_PS2SERIAL == 5
#define PSC_BASE MPC5XXX_PSC5
#elif CONFIG_PS2SERIAL == 6
#define PSC_BASE MPC5XXX_PSC6
#else
#error CONFIG_PS2SERIAL must be in 1 ... 6
#endif
#elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
defined(CONFIG_MPC8548) || defined(CONFIG_MPC8555)
#if CONFIG_PS2SERIAL == 1
#define COM_BASE (CONFIG_SYS_CCSRBAR+0x4500)
#elif CONFIG_PS2SERIAL == 2
#define COM_BASE (CONFIG_SYS_CCSRBAR+0x4600)
#else
#error CONFIG_PS2SERIAL must be in 1 ... 2
#endif
#endif /* CONFIG_MPC5xxx / CONFIG_MPC8540 / other */
static int ps2ser_getc_hw(void);
static void ps2ser_interrupt(void *dev_id);
extern struct serial_state rs_table[]; /* in serial.c */
#if !defined(CONFIG_MPC5xxx) && !defined(CONFIG_MPC8540) && \
!defined(CONFIG_MPC8541) && !defined(CONFIG_MPC8548) && \
!defined(CONFIG_MPC8555)
static struct serial_state *state;
#endif
static u_char ps2buf[PS2BUF_SIZE];
static atomic_t ps2buf_cnt;
static int ps2buf_in_idx;
static int ps2buf_out_idx;
#ifdef CONFIG_MPC5xxx
int ps2ser_init(void)
{
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
unsigned long baseclk;
int div;
/* reset PSC */
psc->command = PSC_SEL_MODE_REG_1;
/* select clock sources */
#if defined(CONFIG_MGT5100)
psc->psc_clock_select = 0xdd00;
baseclk = (CONFIG_SYS_MPC5XXX_CLKIN + 16) / 32;
#elif defined(CONFIG_MPC5200)
psc->psc_clock_select = 0;
baseclk = (gd->ipb_clk + 16) / 32;
#endif
/* switch to UART mode */
psc->sicr = 0;
/* configure parity, bit length and so on */
#if defined(CONFIG_MGT5100)
psc->mode = PSC_MODE_ERR | PSC_MODE_8_BITS | PSC_MODE_PARNONE;
#elif defined(CONFIG_MPC5200)
psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
#endif
psc->mode = PSC_MODE_ONE_STOP;
/* set up UART divisor */
div = (baseclk + (PS2SER_BAUD/2)) / PS2SER_BAUD;
psc->ctur = (div >> 8) & 0xff;
psc->ctlr = div & 0xff;
/* disable all interrupts */
psc->psc_imr = 0;
/* reset and enable Rx/Tx */
psc->command = PSC_RST_RX;
psc->command = PSC_RST_TX;
psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;
return (0);
}
#elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
defined(CONFIG_MPC8548) || defined(CONFIG_MPC8555)
int ps2ser_init(void)
{
NS16550_t com_port = (NS16550_t)COM_BASE;
com_port->ier = 0x00;
com_port->lcr = UART_LCR_BKSE | UART_LCR_8N1;
com_port->dll = (CONFIG_SYS_NS16550_CLK / 16 / PS2SER_BAUD) & 0xff;
com_port->dlm = ((CONFIG_SYS_NS16550_CLK / 16 / PS2SER_BAUD) >> 8) & 0xff;
com_port->lcr = UART_LCR_8N1;
com_port->mcr = (UART_MCR_DTR | UART_MCR_RTS);
com_port->fcr = (UART_FCR_FIFO_EN | UART_FCR_RXSR | UART_FCR_TXSR);
return (0);
}
#else /* !CONFIG_MPC5xxx && !CONFIG_MPC8540 / other */
static inline unsigned int ps2ser_in(int offset)
{
return readb((unsigned long) state->iomem_base + offset);
}
static inline void ps2ser_out(int offset, int value)
{
writeb(value, (unsigned long) state->iomem_base + offset);
}
int ps2ser_init(void)
{
int quot;
unsigned cval;
state = rs_table + CONFIG_PS2SERIAL;
quot = state->baud_base / PS2SER_BAUD;
cval = 0x3; /* 8N1 - 8 data bits, no parity bits, 1 stop bit */
/* Set speed, enable interrupts, enable FIFO
*/
ps2ser_out(UART_LCR, cval | UART_LCR_DLAB);
ps2ser_out(UART_DLL, quot & 0xff);
ps2ser_out(UART_DLM, quot >> 8);
ps2ser_out(UART_LCR, cval);
ps2ser_out(UART_IER, UART_IER_RDI);
ps2ser_out(UART_MCR, UART_MCR_OUT2 | UART_MCR_DTR | UART_MCR_RTS);
ps2ser_out(UART_FCR,
UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
/* If we read 0xff from the LSR, there is no UART here
*/
if (ps2ser_in(UART_LSR) == 0xff) {
printf ("ps2ser.c: no UART found\n");
return -1;
}
irq_install_handler(state->irq, ps2ser_interrupt, NULL);
return 0;
}
#endif /* CONFIG_MPC5xxx / CONFIG_MPC8540 / other */
void ps2ser_putc(int chr)
{
#ifdef CONFIG_MPC5xxx
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
#elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
defined(CONFIG_MPC8548) || defined(CONFIG_MPC8555)
NS16550_t com_port = (NS16550_t)COM_BASE;
#endif
#ifdef DEBUG
printf(">>>> 0x%02x\n", chr);
#endif
#ifdef CONFIG_MPC5xxx
while (!(psc->psc_status & PSC_SR_TXRDY));
psc->psc_buffer_8 = chr;
#elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
defined(CONFIG_MPC8548) || defined(CONFIG_MPC8555)
while ((com_port->lsr & UART_LSR_THRE) == 0);
com_port->thr = chr;
#else
while (!(ps2ser_in(UART_LSR) & UART_LSR_THRE));
ps2ser_out(UART_TX, chr);
#endif
}
static int ps2ser_getc_hw(void)
{
#ifdef CONFIG_MPC5xxx
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
#elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
defined(CONFIG_MPC8548) || defined(CONFIG_MPC8555)
NS16550_t com_port = (NS16550_t)COM_BASE;
#endif
int res = -1;
#ifdef CONFIG_MPC5xxx
if (psc->psc_status & PSC_SR_RXRDY) {
res = (psc->psc_buffer_8);
}
#elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
defined(CONFIG_MPC8548) || defined(CONFIG_MPC8555)
if (com_port->lsr & UART_LSR_DR) {
res = com_port->rbr;
}
#else
if (ps2ser_in(UART_LSR) & UART_LSR_DR) {
res = (ps2ser_in(UART_RX));
}
#endif
return res;
}
int ps2ser_getc(void)
{
volatile int chr;
int flags;
#ifdef DEBUG
printf("<< ");
#endif
flags = disable_interrupts();
do {
if (atomic_read(&ps2buf_cnt) != 0) {
chr = ps2buf[ps2buf_out_idx++];
ps2buf_out_idx &= (PS2BUF_SIZE - 1);
atomic_dec(&ps2buf_cnt);
} else {
chr = ps2ser_getc_hw();
}
}
while (chr < 0);
if (flags) enable_interrupts();
#ifdef DEBUG
printf("0x%02x\n", chr);
#endif
return chr;
}
int ps2ser_check(void)
{
int flags;
flags = disable_interrupts();
ps2ser_interrupt(NULL);
if (flags) enable_interrupts();
return atomic_read(&ps2buf_cnt);
}
static void ps2ser_interrupt(void *dev_id)
{
#ifdef CONFIG_MPC5xxx
volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
#elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
defined(CONFIG_MPC8548) || defined(CONFIG_MPC8555)
NS16550_t com_port = (NS16550_t)COM_BASE;
#endif
int chr;
int status;
do {
chr = ps2ser_getc_hw();
#ifdef CONFIG_MPC5xxx
status = psc->psc_status;
#elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
defined(CONFIG_MPC8548) || defined(CONFIG_MPC8555)
status = com_port->lsr;
#else
status = ps2ser_in(UART_IIR);
#endif
if (chr < 0) continue;
if (atomic_read(&ps2buf_cnt) < PS2BUF_SIZE) {
ps2buf[ps2buf_in_idx++] = chr;
ps2buf_in_idx &= (PS2BUF_SIZE - 1);
atomic_inc(&ps2buf_cnt);
} else {
printf ("ps2ser.c: buffer overflow\n");
}
#ifdef CONFIG_MPC5xxx
} while (status & PSC_SR_RXRDY);
#elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
defined(CONFIG_MPC8548) || defined(CONFIG_MPC8555)
} while (status & UART_LSR_DR);
#else
} while (status & UART_IIR_RDI);
#endif
if (atomic_read(&ps2buf_cnt)) {
ps2mult_callback(atomic_read(&ps2buf_cnt));
}
}
|
