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)
92 np = of_find_node_by_name(NULL, "escc");
93 if (np == NULL || np->parent == NULL)
96 udbg_printf("found SCC...\n");
97 /* Get address within mac-io ASIC */
98 reg = (u32 *)get_property(np, "reg", NULL);
102 udbg_printf("local addr: %lx\n", addr);
103 /* Get address of mac-io PCI itself */
104 reg = (u32 *)get_property(np->parent, "assigned-addresses", NULL);
108 udbg_printf("final addr: %lx\n", addr);
110 /* Setup for 57600 8N1 */
112 sccc = (volatile u8 *) ioremap(addr & PAGE_MASK, PAGE_SIZE) ;
113 sccc += addr & ~PAGE_MASK;
116 udbg_printf("ioremap result sccc: %p\n", sccc);
119 for (i = 20000; i != 0; --i)
121 *sccc = 9; eieio(); /* reset A or B side */
122 *sccc = 0xc0; eieio();
123 for (i = 0; i < sizeof(scc_inittab); ++i) {
124 *sccc = scc_inittab[i];
128 ppc_md.udbg_putc = udbg_putc;
129 ppc_md.udbg_getc = udbg_getc;
130 ppc_md.udbg_getc_poll = udbg_getc_poll;
132 udbg_puts("Hello World !\n");
135 #endif /* CONFIG_PPC_PMAC */
138 extern u8 real_readb(volatile u8 *addr);
139 extern void real_writeb(u8 data, volatile u8 *addr);
141 static void udbg_real_putc(unsigned char c)
143 while ((real_readb(sccc) & SCC_TXRDY) == 0)
145 real_writeb(c, sccd);
147 udbg_real_putc('\r');
150 void udbg_init_pmac_realmode(void)
152 sccc = (volatile u8 *)0x80013020ul;
153 sccd = (volatile u8 *)0x80013030ul;
155 ppc_md.udbg_putc = udbg_real_putc;
156 ppc_md.udbg_getc = NULL;
157 ppc_md.udbg_getc_poll = NULL;
159 #endif /* CONFIG_PPC_PMAC */
161 void udbg_putc(unsigned char c)
164 while ((udbg_comport->lsr & LSR_THRE) == 0)
166 udbg_comport->thr = c; eieio();
168 /* Also put a CR. This is for convenience. */
169 while ((udbg_comport->lsr & LSR_THRE) == 0)
171 udbg_comport->thr = '\r'; eieio();
174 #ifdef CONFIG_PPC_PMAC
176 while ((*sccc & SCC_TXRDY) == 0)
183 #endif /* CONFIG_PPC_PMAC */
186 int udbg_getc_poll(void)
189 if ((udbg_comport->lsr & LSR_DR) != 0)
190 return udbg_comport->rbr;
194 #ifdef CONFIG_PPC_PMAC
197 if ((*sccc & SCC_RXRDY) != 0)
202 #endif /* CONFIG_PPC_PMAC */
206 unsigned char udbg_getc(void)
209 while ((udbg_comport->lsr & LSR_DR) == 0)
211 return udbg_comport->rbr;
213 #ifdef CONFIG_PPC_PMAC
216 while ((*sccc & SCC_RXRDY) == 0)
220 #endif /* CONFIG_PPC_PMAC */
224 void udbg_puts(const char *s)
226 if (ppc_md.udbg_putc) {
229 if (s && *s != '\0') {
230 while ((c = *s++) != '\0')
241 int udbg_write(const char *s, int n)
246 if (!ppc_md.udbg_putc)
249 if (s && *s != '\0') {
250 while (((c = *s++) != '\0') && (remain-- > 0)) {
258 int udbg_read(char *buf, int buflen)
263 if (!ppc_md.udbg_getc)
266 for (i = 0; i < buflen; ++i) {
268 c = ppc_md.udbg_getc();
269 } while (c == 0x11 || c == 0x13);
278 void udbg_console_write(struct console *con, const char *s, unsigned int n)
283 #define UDBG_BUFSIZE 256
284 void udbg_printf(const char *fmt, ...)
286 unsigned char buf[UDBG_BUFSIZE];
290 vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
295 /* Special print used by PPCDBG() macro */
296 void udbg_ppcdbg(unsigned long debug_flags, const char *fmt, ...)
298 unsigned long active_debugs = debug_flags & naca->debug_switch;
302 unsigned char buf[UDBG_BUFSIZE];
303 unsigned long i, len = 0;
305 for (i=0; i < PPCDBG_NUM_FLAGS; i++) {
306 if (((1U << i) & active_debugs) &&
308 len += strlen(trace_names[i]);
309 udbg_puts(trace_names[i]);
314 snprintf(buf, UDBG_BUFSIZE, " [%s]: ", current->comm);
324 vsnprintf(buf, UDBG_BUFSIZE, fmt, ap);
330 unsigned long udbg_ifdebug(unsigned long flags)
332 return (flags & naca->debug_switch);