2 * NS16550 Serial Port (uart) debugging stuff.
4 * c 2001 PPC 64 Team, IBM Corp
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
13 #define WANT_PPCDBG_TAB /* Only defined here */
14 #include <asm/ppcdebug.h>
15 #include <asm/processor.h>
17 #include <asm/uaccess.h>
18 #include <asm/machdep.h>
21 #include <asm/pmac_feature.h>
24 /* this struct must be packed */
25 unsigned char rbr; /* 0 */
26 unsigned char ier; /* 1 */
27 unsigned char fcr; /* 2 */
28 unsigned char lcr; /* 3 */
29 unsigned char mcr; /* 4 */
30 unsigned char lsr; /* 5 */
31 unsigned char msr; /* 6 */
32 unsigned char scr; /* 7 */
41 #define LSR_DR 0x01 /* Data ready */
42 #define LSR_OE 0x02 /* Overrun */
43 #define LSR_PE 0x04 /* Parity error */
44 #define LSR_FE 0x08 /* Framing error */
45 #define LSR_BI 0x10 /* Break */
46 #define LSR_THRE 0x20 /* Xmit holding register empty */
47 #define LSR_TEMT 0x40 /* Xmitter empty */
48 #define LSR_ERR 0x80 /* Error */
50 static volatile struct NS16550 *udbg_comport;
52 void udbg_init_uart(void *comport)
55 udbg_comport = (struct NS16550 *)comport;
56 udbg_comport->lcr = 0x00; eieio();
57 udbg_comport->ier = 0xFF; eieio();
58 udbg_comport->ier = 0x00; eieio();
59 udbg_comport->lcr = 0x80; eieio(); /* Access baud rate */
60 udbg_comport->dll = 12; eieio(); /* 1 = 115200, 2 = 57600, 3 = 38400, 12 = 9600 baud */
61 udbg_comport->dlm = 0; eieio(); /* dll >> 8 which should be zero for fast rates; */
62 udbg_comport->lcr = 0x03; eieio(); /* 8 data, 1 stop, no parity */
63 udbg_comport->mcr = 0x03; eieio(); /* RTS/DTR */
64 udbg_comport->fcr = 0x07; eieio(); /* Clear & enable FIFOs */
68 #ifdef CONFIG_PPC_PMAC
73 static volatile u8 *sccc, *sccd;
75 static unsigned char scc_inittab[] = {
76 13, 0, /* set baud rate divisor */
78 14, 1, /* baud rate gen enable, src=rtxc */
79 11, 0x50, /* clocks = br gen */
80 5, 0xea, /* tx 8 bits, assert DTR & RTS */
81 4, 0x46, /* x16 clock, 1 stop */
82 3, 0xc1, /* rx enable, 8 bits */
85 void udbg_init_scc(struct device_node *np)
91 np = of_find_node_by_name(NULL, "escc");
95 /* Lock-enable the SCC channel */
96 pmac_call_feature(PMAC_FTR_SCC_ENABLE, np, PMAC_SCC_ASYNC | PMAC_SCC_FLAG_XMON, 1);
98 /* Setup for 57600 8N1 */
99 addr = np->addrs[0].address + 0x20;
100 sccc = (volatile u8 *) ioremap(addr & PAGE_MASK, PAGE_SIZE) ;
101 sccc += addr & ~PAGE_MASK;
104 for (i = 20000; i != 0; --i)
106 *sccc = 9; eieio(); /* reset A or B side */
107 *sccc = 0xc0; eieio();
108 for (i = 0; i < sizeof(scc_inittab); ++i) {
109 *sccc = scc_inittab[i];
113 ppc_md.udbg_putc = udbg_putc;
114 ppc_md.udbg_getc = udbg_getc;
115 ppc_md.udbg_getc_poll = udbg_getc_poll;
117 udbg_puts("Hello World !\n");
120 #endif /* CONFIG_PPC_PMAC */
122 void udbg_putc(unsigned char c)
125 while ((udbg_comport->lsr & LSR_THRE) == 0)
127 udbg_comport->thr = c; eieio();
129 /* Also put a CR. This is for convenience. */
130 while ((udbg_comport->lsr & LSR_THRE) == 0)
132 udbg_comport->thr = '\r'; eieio();
135 #ifdef CONFIG_PPC_PMAC
137 while ((*sccc & SCC_TXRDY) == 0)
144 #endif /* CONFIG_PPC_PMAC */
147 int udbg_getc_poll(void)
150 if ((udbg_comport->lsr & LSR_DR) != 0)
151 return udbg_comport->rbr;
155 #ifdef CONFIG_PPC_PMAC
158 if ((*sccc & SCC_RXRDY) != 0)
163 #endif /* CONFIG_PPC_PMAC */
167 unsigned char udbg_getc(void)
170 while ((udbg_comport->lsr & LSR_DR) == 0)
172 return udbg_comport->rbr;
174 #ifdef CONFIG_PPC_PMAC
177 while ((*sccc & SCC_RXRDY) == 0)
181 #endif /* CONFIG_PPC_PMAC */
185 void udbg_puts(const char *s)
187 if (ppc_md.udbg_putc) {
190 if (s && *s != '\0') {
191 while ((c = *s++) != '\0')
199 int udbg_write(const char *s, int n)
204 if (!ppc_md.udbg_putc)
207 if (s && *s != '\0') {
208 while (((c = *s++) != '\0') && (remain-- > 0)) {
216 int udbg_read(char *buf, int buflen)
221 if (!ppc_md.udbg_putc)
224 for (i = 0; i < buflen; ++i) {
226 c = ppc_md.udbg_getc();
227 } while (c == 0x11 || c == 0x13);
236 void udbg_console_write(struct console *con, const char *s, unsigned int n)
241 #define UDBG_BUFSIZE 256
242 void udbg_printf(const char *fmt, ...)
244 unsigned char buf[UDBG_BUFSIZE];
248 vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
253 /* Special print used by PPCDBG() macro */
254 void udbg_ppcdbg(unsigned long debug_flags, const char *fmt, ...)
256 unsigned long active_debugs = debug_flags & naca->debug_switch;
260 unsigned char buf[UDBG_BUFSIZE];
261 unsigned long i, len = 0;
263 for (i=0; i < PPCDBG_NUM_FLAGS; i++) {
264 if (((1U << i) & active_debugs) &&
266 len += strlen(trace_names[i]);
267 udbg_puts(trace_names[i]);
272 snprintf(buf, UDBG_BUFSIZE, " [%s]: ", current->comm);
282 vsnprintf(buf, UDBG_BUFSIZE, fmt, ap);
288 unsigned long udbg_ifdebug(unsigned long flags)
290 return (flags & naca->debug_switch);