aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sh
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/Kconfig.debug44
-rw-r--r--arch/sh/kernel/Makefile3
-rw-r--r--arch/sh/kernel/early_printk.c147
3 files changed, 1 insertions, 193 deletions
diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug
index 55907af1dc25..12fec72fec5f 100644
--- a/arch/sh/Kconfig.debug
+++ b/arch/sh/Kconfig.debug
@@ -19,50 +19,6 @@ config SH_STANDARD_BIOS
19 mask ROM and no flash (WindowsCE machines fall in this category). 19 mask ROM and no flash (WindowsCE machines fall in this category).
20 If unsure, say N. 20 If unsure, say N.
21 21
22config EARLY_SCIF_CONSOLE
23 bool "Use early SCIF console"
24 help
25 This enables an early console using a fixed SCIF port. This can
26 be used by platforms that are either not running the SH
27 standard BIOS, or do not wish to use the BIOS callbacks for the
28 serial I/O.
29
30config EARLY_SCIF_CONSOLE_PORT
31 hex
32 depends on EARLY_SCIF_CONSOLE
33 default "0xa4400000" if CPU_SUBTYPE_SH7712 || CPU_SUBTYPE_SH7705
34 default "0xa4430000" if CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721
35 default "0xf8420000" if CPU_SUBTYPE_SH7619
36 default "0xff804000" if CPU_SUBTYPE_MXG
37 default "0xffc30000" if CPU_SUBTYPE_SHX3
38 default "0xffe00000" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7763 || \
39 CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \
40 CPU_SUBTYPE_SH7343
41 default "0xfe4c0000" if CPU_SUBTYPE_SH7757
42 default "0xffeb0000" if CPU_SUBTYPE_SH7785
43 default "0xffeb0000" if CPU_SUBTYPE_SH7786
44 default "0xfffe8000" if CPU_SUBTYPE_SH7203
45 default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263
46 default "0xffe80000" if CPU_SH4
47 default "0xa4000150" if CPU_SH3
48 default "0x00000000"
49
50config EARLY_PRINTK
51 bool "Early printk support"
52 depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE
53 help
54 Say Y here to redirect kernel printk messages to the serial port
55 used by the SH-IPL bootloader, starting very early in the boot
56 process and ending when the kernel's serial console is initialised.
57 This option is only useful porting the kernel to a new machine,
58 when the kernel may crash or hang before the serial console is
59 initialised. If unsure, say N.
60
61 On devices that are running SH-IPL and want to keep the port
62 initialization consistent while not using the BIOS callbacks,
63 select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using
64 the kernel command line option to toggle back and forth.
65
66config STACK_DEBUG 22config STACK_DEBUG
67 bool "Check for stack overflows" 23 bool "Check for stack overflows"
68 depends on DEBUG_KERNEL && SUPERH32 24 depends on DEBUG_KERNEL && SUPERH32
diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile
index 0471a3eb25ed..0d587da1ef12 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -22,11 +22,10 @@ obj-y := debugtraps.o dma-nommu.o dumpstack.o \
22obj-y += cpu/ 22obj-y += cpu/
23obj-$(CONFIG_VSYSCALL) += vsyscall/ 23obj-$(CONFIG_VSYSCALL) += vsyscall/
24obj-$(CONFIG_SMP) += smp.o 24obj-$(CONFIG_SMP) += smp.o
25obj-$(CONFIG_SH_STANDARD_BIOS) += sh_bios.o 25obj-$(CONFIG_SH_STANDARD_BIOS) += sh_bios.o early_printk.o
26obj-$(CONFIG_KGDB) += kgdb.o 26obj-$(CONFIG_KGDB) += kgdb.o
27obj-$(CONFIG_SH_CPU_FREQ) += cpufreq.o 27obj-$(CONFIG_SH_CPU_FREQ) += cpufreq.o
28obj-$(CONFIG_MODULES) += sh_ksyms_$(BITS).o module.o 28obj-$(CONFIG_MODULES) += sh_ksyms_$(BITS).o module.o
29obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
30obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o 29obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
31obj-$(CONFIG_CRASH_DUMP) += crash_dump.o 30obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
32obj-$(CONFIG_STACKTRACE) += stacktrace.o 31obj-$(CONFIG_STACKTRACE) += stacktrace.o
diff --git a/arch/sh/kernel/early_printk.c b/arch/sh/kernel/early_printk.c
index fe7dc3fe1db1..f8bb50c6e050 100644
--- a/arch/sh/kernel/early_printk.c
+++ b/arch/sh/kernel/early_printk.c
@@ -15,7 +15,6 @@
15#include <linux/io.h> 15#include <linux/io.h>
16#include <linux/delay.h> 16#include <linux/delay.h>
17 17
18#ifdef CONFIG_SH_STANDARD_BIOS
19#include <asm/sh_bios.h> 18#include <asm/sh_bios.h>
20 19
21/* 20/*
@@ -57,140 +56,7 @@ static struct console bios_console = {
57 .flags = CON_PRINTBUFFER, 56 .flags = CON_PRINTBUFFER,
58 .index = -1, 57 .index = -1,
59}; 58};
60#endif
61 59
62#ifdef CONFIG_EARLY_SCIF_CONSOLE
63#include <linux/serial_core.h>
64#include "../../../drivers/serial/sh-sci.h"
65
66#if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
67 defined(CONFIG_CPU_SUBTYPE_SH7721)
68#define EPK_SCSMR_VALUE 0x000
69#define EPK_SCBRR_VALUE 0x00C
70#define EPK_FIFO_SIZE 64
71#define EPK_FIFO_BITS (0x7f00 >> 8)
72#else
73#define EPK_FIFO_SIZE 16
74#define EPK_FIFO_BITS (0x1f00 >> 8)
75#endif
76
77static struct uart_port scif_port = {
78 .type = PORT_SCIF,
79 .mapbase = CONFIG_EARLY_SCIF_CONSOLE_PORT,
80 .membase = (char __iomem *)CONFIG_EARLY_SCIF_CONSOLE_PORT,
81};
82
83static void scif_sercon_putc(int c)
84{
85 while (((sci_in(&scif_port, SCFDR) & EPK_FIFO_BITS) >= EPK_FIFO_SIZE))
86 ;
87
88 sci_in(&scif_port, SCxSR);
89 sci_out(&scif_port, SCxSR, 0xf3 & ~(0x20 | 0x40));
90 sci_out(&scif_port, SCxTDR, c);
91
92 while ((sci_in(&scif_port, SCxSR) & 0x40) == 0)
93 ;
94
95 if (c == '\n')
96 scif_sercon_putc('\r');
97}
98
99static void scif_sercon_write(struct console *con, const char *s,
100 unsigned count)
101{
102 while (count-- > 0)
103 scif_sercon_putc(*s++);
104}
105
106static int __init scif_sercon_setup(struct console *con, char *options)
107{
108 con->cflag = CREAD | HUPCL | CLOCAL | B115200 | CS8;
109
110 return 0;
111}
112
113static struct console scif_console = {
114 .name = "sercon",
115 .write = scif_sercon_write,
116 .setup = scif_sercon_setup,
117 .flags = CON_PRINTBUFFER,
118 .index = -1,
119};
120
121#if !defined(CONFIG_SH_STANDARD_BIOS)
122#if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
123 defined(CONFIG_CPU_SUBTYPE_SH7721)
124static void scif_sercon_init(char *s)
125{
126 sci_out(&scif_port, SCSCR, 0x0000); /* clear TE and RE */
127 sci_out(&scif_port, SCFCR, 0x4006); /* reset */
128 sci_out(&scif_port, SCSCR, 0x0000); /* select internal clock */
129 sci_out(&scif_port, SCSMR, EPK_SCSMR_VALUE);
130 sci_out(&scif_port, SCBRR, EPK_SCBRR_VALUE);
131
132 mdelay(1); /* wait 1-bit time */
133
134 sci_out(&scif_port, SCFCR, 0x0030); /* TTRG=b'11 */
135 sci_out(&scif_port, SCSCR, 0x0030); /* TE, RE */
136}
137#elif defined(CONFIG_CPU_SH4) || defined(CONFIG_CPU_SH3)
138#define DEFAULT_BAUD 115200
139/*
140 * Simple SCIF init, primarily aimed at SH7750 and other similar SH-4
141 * devices that aren't using sh-ipl+g.
142 */
143static void scif_sercon_init(char *s)
144{
145 struct uart_port *port = &scif_port;
146 unsigned baud = DEFAULT_BAUD;
147 unsigned int status;
148 char *e;
149
150 if (*s == ',')
151 ++s;
152
153 if (*s) {
154 /* ignore ioport/device name */
155 s += strcspn(s, ",");
156 if (*s == ',')
157 s++;
158 }
159
160 if (*s) {
161 baud = simple_strtoul(s, &e, 0);
162 if (baud == 0 || s == e)
163 baud = DEFAULT_BAUD;
164 }
165
166 do {
167 status = sci_in(port, SCxSR);
168 } while (!(status & SCxSR_TEND(port)));
169
170 sci_out(port, SCSCR, 0); /* TE=0, RE=0 */
171 sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
172 sci_out(port, SCSMR, 0);
173
174 /* Set baud rate */
175 sci_out(port, SCBRR, (CONFIG_SH_PCLK_FREQ + 16 * baud) /
176 (32 * baud) - 1);
177 udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
178
179 sci_out(port, SCSPTR, 0);
180 sci_out(port, SCxSR, 0x60);
181 sci_out(port, SCLSR, 0);
182
183 sci_out(port, SCFCR, 0);
184 sci_out(port, SCSCR, 0x30); /* TE=1, RE=1 */
185}
186#endif /* defined(CONFIG_CPU_SUBTYPE_SH7720) */
187#endif /* !defined(CONFIG_SH_STANDARD_BIOS) */
188#endif /* CONFIG_EARLY_SCIF_CONSOLE */
189
190/*
191 * Setup a default console, if more than one is compiled in, rely on the
192 * earlyprintk= parsing to give priority.
193 */
194static struct console *early_console; 60static struct console *early_console;
195 61
196static int __init setup_early_printk(char *buf) 62static int __init setup_early_printk(char *buf)
@@ -203,21 +69,8 @@ static int __init setup_early_printk(char *buf)
203 if (strstr(buf, "keep")) 69 if (strstr(buf, "keep"))
204 keep_early = 1; 70 keep_early = 1;
205 71
206#ifdef CONFIG_SH_STANDARD_BIOS
207 if (!strncmp(buf, "bios", 4)) 72 if (!strncmp(buf, "bios", 4))
208 early_console = &bios_console; 73 early_console = &bios_console;
209#endif
210#if defined(CONFIG_EARLY_SCIF_CONSOLE)
211 if (!strncmp(buf, "serial", 6)) {
212 early_console = &scif_console;
213
214#if !defined(CONFIG_SH_STANDARD_BIOS)
215#if defined(CONFIG_CPU_SH4) || defined(CONFIG_CPU_SH3)
216 scif_sercon_init(buf + 6);
217#endif
218#endif
219 }
220#endif
221 74
222 if (likely(early_console)) { 75 if (likely(early_console)) {
223 if (keep_early) 76 if (keep_early)