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Linux/arch/powerpc/platforms/powermac/udbg_scc.c

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  1 /*
  2  * udbg for zilog scc ports as found on Apple PowerMacs
  3  *
  4  * Copyright (C) 2001-2005 PPC 64 Team, IBM Corp
  5  *
  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.
 10  */
 11 #include <linux/types.h>
 12 #include <asm/udbg.h>
 13 #include <asm/processor.h>
 14 #include <asm/io.h>
 15 #include <asm/prom.h>
 16 #include <asm/pmac_feature.h>
 17 
 18 extern u8 real_readb(volatile u8 __iomem  *addr);
 19 extern void real_writeb(u8 data, volatile u8 __iomem *addr);
 20 
 21 #define SCC_TXRDY       4
 22 #define SCC_RXRDY       1
 23 
 24 static volatile u8 __iomem *sccc;
 25 static volatile u8 __iomem *sccd;
 26 
 27 static void udbg_scc_putc(char c)
 28 {
 29         if (sccc) {
 30                 while ((in_8(sccc) & SCC_TXRDY) == 0)
 31                         ;
 32                 out_8(sccd,  c);
 33                 if (c == '\n')
 34                         udbg_scc_putc('\r');
 35         }
 36 }
 37 
 38 static int udbg_scc_getc_poll(void)
 39 {
 40         if (sccc) {
 41                 if ((in_8(sccc) & SCC_RXRDY) != 0)
 42                         return in_8(sccd);
 43                 else
 44                         return -1;
 45         }
 46         return -1;
 47 }
 48 
 49 static int udbg_scc_getc(void)
 50 {
 51         if (sccc) {
 52                 while ((in_8(sccc) & SCC_RXRDY) == 0)
 53                         ;
 54                 return in_8(sccd);
 55         }
 56         return -1;
 57 }
 58 
 59 static unsigned char scc_inittab[] = {
 60     13, 0,              /* set baud rate divisor */
 61     12, 0,
 62     14, 1,              /* baud rate gen enable, src=rtxc */
 63     11, 0x50,           /* clocks = br gen */
 64     5,  0xea,           /* tx 8 bits, assert DTR & RTS */
 65     4,  0x46,           /* x16 clock, 1 stop */
 66     3,  0xc1,           /* rx enable, 8 bits */
 67 };
 68 
 69 void udbg_scc_init(int force_scc)
 70 {
 71         const u32 *reg;
 72         unsigned long addr;
 73         struct device_node *stdout = NULL, *escc = NULL, *macio = NULL;
 74         struct device_node *ch, *ch_def = NULL, *ch_a = NULL;
 75         const char *path;
 76         int i, x;
 77 
 78         escc = of_find_node_by_name(NULL, "escc");
 79         if (escc == NULL)
 80                 goto bail;
 81         macio = of_get_parent(escc);
 82         if (macio == NULL)
 83                 goto bail;
 84         path = of_get_property(of_chosen, "linux,stdout-path", NULL);
 85         if (path != NULL)
 86                 stdout = of_find_node_by_path(path);
 87         for (ch = NULL; (ch = of_get_next_child(escc, ch)) != NULL;) {
 88                 if (ch == stdout)
 89                         ch_def = of_node_get(ch);
 90                 if (strcmp(ch->name, "ch-a") == 0)
 91                         ch_a = of_node_get(ch);
 92         }
 93         if (ch_def == NULL && !force_scc)
 94                 goto bail;
 95 
 96         ch = ch_def ? ch_def : ch_a;
 97 
 98         /* Get address within mac-io ASIC */
 99         reg = of_get_property(escc, "reg", NULL);
100         if (reg == NULL)
101                 goto bail;
102         addr = reg[0];
103 
104         /* Get address of mac-io PCI itself */
105         reg = of_get_property(macio, "assigned-addresses", NULL);
106         if (reg == NULL)
107                 goto bail;
108         addr += reg[2];
109 
110         /* Lock the serial port */
111         pmac_call_feature(PMAC_FTR_SCC_ENABLE, ch,
112                           PMAC_SCC_ASYNC | PMAC_SCC_FLAG_XMON, 1);
113 
114         if (ch == ch_a)
115                 addr += 0x20;
116         sccc = ioremap(addr & PAGE_MASK, PAGE_SIZE) ;
117         sccc += addr & ~PAGE_MASK;
118         sccd = sccc + 0x10;
119 
120         mb();
121 
122         for (i = 20000; i != 0; --i)
123                 x = in_8(sccc);
124         out_8(sccc, 0x09);              /* reset A or B side */
125         out_8(sccc, 0xc0);
126 
127         /* If SCC was the OF output port, read the BRG value, else
128          * Setup for 38400 or 57600 8N1 depending on the machine
129          */
130         if (ch_def != NULL) {
131                 out_8(sccc, 13);
132                 scc_inittab[1] = in_8(sccc);
133                 out_8(sccc, 12);
134                 scc_inittab[3] = in_8(sccc);
135         } else if (of_machine_is_compatible("RackMac1,1")
136                    || of_machine_is_compatible("RackMac1,2")
137                    || of_machine_is_compatible("MacRISC4")) {
138                 /* Xserves and G5s default to 57600 */
139                 scc_inittab[1] = 0;
140                 scc_inittab[3] = 0;
141         } else {
142                 /* Others default to 38400 */
143                 scc_inittab[1] = 0;
144                 scc_inittab[3] = 1;
145         }
146 
147         for (i = 0; i < sizeof(scc_inittab); ++i)
148                 out_8(sccc, scc_inittab[i]);
149 
150 
151         udbg_putc = udbg_scc_putc;
152         udbg_getc = udbg_scc_getc;
153         udbg_getc_poll = udbg_scc_getc_poll;
154 
155         udbg_puts("Hello World !\n");
156 
157  bail:
158         of_node_put(macio);
159         of_node_put(escc);
160         of_node_put(stdout);
161         of_node_put(ch_def);
162         of_node_put(ch_a);
163 }
164 
165 #ifdef CONFIG_PPC64
166 static void udbg_real_scc_putc(char c)
167 {
168         while ((real_readb(sccc) & SCC_TXRDY) == 0)
169                 ;
170         real_writeb(c, sccd);
171         if (c == '\n')
172                 udbg_real_scc_putc('\r');
173 }
174 
175 void __init udbg_init_pmac_realmode(void)
176 {
177         sccc = (volatile u8 __iomem *)0x80013020ul;
178         sccd = (volatile u8 __iomem *)0x80013030ul;
179 
180         udbg_putc = udbg_real_scc_putc;
181         udbg_getc = NULL;
182         udbg_getc_poll = NULL;
183 }
184 #endif /* CONFIG_PPC64 */
185 

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