8a09cec25f
Since commit d6713b4091 ("m68k: early
parameter support"), the user can specify multiple debug consoles using the
"debug=" kernel command line parameter.
However, as there's only a single struct console object, which is reused,
it would actually register the same console object multiple times, causing
the following warning:
WARNING: CPU: 0 PID: 0 at kernel/printk/printk.c:2233 register_console+0x36/
console 'debug0' already registered
Make sure to register the console object only once, to avoid the warning.
Note that still only one console (the one corresponding to the last
"debug=" parameter) will be active at the same time, as the .write() method
of the already registered console object is overwritten by a subsequent
"debug=" parameter.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
330 lines
8.9 KiB
C
330 lines
8.9 KiB
C
/*
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* linux/arch/m68k/atari/debug.c
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*
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* Atari debugging and serial console stuff
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*
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* Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/types.h>
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#include <linux/tty.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <asm/atarihw.h>
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#include <asm/atariints.h>
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/* Can be set somewhere, if a SCC master reset has already be done and should
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* not be repeated; used by kgdb */
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int atari_SCC_reset_done;
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EXPORT_SYMBOL(atari_SCC_reset_done);
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static struct console atari_console_driver = {
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.name = "debug",
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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static inline void ata_mfp_out(char c)
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{
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while (!(st_mfp.trn_stat & 0x80)) /* wait for tx buf empty */
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barrier();
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st_mfp.usart_dta = c;
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}
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static void atari_mfp_console_write(struct console *co, const char *str,
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unsigned int count)
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{
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while (count--) {
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if (*str == '\n')
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ata_mfp_out('\r');
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ata_mfp_out(*str++);
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}
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}
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static inline void ata_scc_out(char c)
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{
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do {
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MFPDELAY();
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} while (!(atari_scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
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MFPDELAY();
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atari_scc.cha_b_data = c;
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}
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static void atari_scc_console_write(struct console *co, const char *str,
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unsigned int count)
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{
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while (count--) {
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if (*str == '\n')
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ata_scc_out('\r');
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ata_scc_out(*str++);
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}
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}
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static inline void ata_midi_out(char c)
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{
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while (!(acia.mid_ctrl & ACIA_TDRE)) /* wait for tx buf empty */
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barrier();
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acia.mid_data = c;
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}
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static void atari_midi_console_write(struct console *co, const char *str,
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unsigned int count)
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{
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while (count--) {
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if (*str == '\n')
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ata_midi_out('\r');
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ata_midi_out(*str++);
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}
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}
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static int ata_par_out(char c)
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{
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unsigned char tmp;
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/* This a some-seconds timeout in case no printer is connected */
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unsigned long i = loops_per_jiffy > 1 ? loops_per_jiffy : 10000000/HZ;
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while ((st_mfp.par_dt_reg & 1) && --i) /* wait for BUSY == L */
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;
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if (!i)
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return 0;
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sound_ym.rd_data_reg_sel = 15; /* select port B */
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sound_ym.wd_data = c; /* put char onto port */
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sound_ym.rd_data_reg_sel = 14; /* select port A */
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tmp = sound_ym.rd_data_reg_sel;
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sound_ym.wd_data = tmp & ~0x20; /* set strobe L */
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MFPDELAY(); /* wait a bit */
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sound_ym.wd_data = tmp | 0x20; /* set strobe H */
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return 1;
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}
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static void atari_par_console_write(struct console *co, const char *str,
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unsigned int count)
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{
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static int printer_present = 1;
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if (!printer_present)
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return;
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while (count--) {
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if (*str == '\n') {
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if (!ata_par_out('\r')) {
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printer_present = 0;
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return;
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}
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}
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if (!ata_par_out(*str++)) {
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printer_present = 0;
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return;
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}
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}
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}
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#if 0
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int atari_mfp_console_wait_key(struct console *co)
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{
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while (!(st_mfp.rcv_stat & 0x80)) /* wait for rx buf filled */
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barrier();
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return st_mfp.usart_dta;
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}
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int atari_scc_console_wait_key(struct console *co)
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{
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do {
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MFPDELAY();
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} while (!(atari_scc.cha_b_ctrl & 0x01)); /* wait for rx buf filled */
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MFPDELAY();
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return atari_scc.cha_b_data;
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}
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int atari_midi_console_wait_key(struct console *co)
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{
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while (!(acia.mid_ctrl & ACIA_RDRF)) /* wait for rx buf filled */
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barrier();
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return acia.mid_data;
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}
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#endif
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/*
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* The following two functions do a quick'n'dirty initialization of the MFP or
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* SCC serial ports. They're used by the debugging interface, kgdb, and the
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* serial console code.
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*/
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static void __init atari_init_mfp_port(int cflag)
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{
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/*
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* timer values for 1200...115200 bps; > 38400 select 110, 134, or 150
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* bps, resp., and work only correct if there's a RSVE or RSSPEED
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*/
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static int baud_table[9] = { 16, 11, 8, 4, 2, 1, 175, 143, 128 };
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int baud = cflag & CBAUD;
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int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x04 : 0x06) : 0;
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int csize = ((cflag & CSIZE) == CS7) ? 0x20 : 0x00;
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if (cflag & CBAUDEX)
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baud += B38400;
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if (baud < B1200 || baud > B38400+2)
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baud = B9600; /* use default 9600bps for non-implemented rates */
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baud -= B1200; /* baud_table[] starts at 1200bps */
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st_mfp.trn_stat &= ~0x01; /* disable TX */
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st_mfp.usart_ctr = parity | csize | 0x88; /* 1:16 clk mode, 1 stop bit */
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st_mfp.tim_ct_cd &= 0x70; /* stop timer D */
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st_mfp.tim_dt_d = baud_table[baud];
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st_mfp.tim_ct_cd |= 0x01; /* start timer D, 1:4 */
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st_mfp.trn_stat |= 0x01; /* enable TX */
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}
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#define SCC_WRITE(reg, val) \
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do { \
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atari_scc.cha_b_ctrl = (reg); \
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MFPDELAY(); \
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atari_scc.cha_b_ctrl = (val); \
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MFPDELAY(); \
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} while (0)
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/* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
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* delay of ~ 60us. */
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#define LONG_DELAY() \
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do { \
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int i; \
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for (i = 100; i > 0; --i) \
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MFPDELAY(); \
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} while (0)
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static void __init atari_init_scc_port(int cflag)
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{
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static int clksrc_table[9] =
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/* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
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{ 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
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static int brgsrc_table[9] =
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/* reg 14: 0 = RTxC, 2 = PCLK */
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{ 2, 2, 2, 2, 2, 2, 0, 2, 2 };
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static int clkmode_table[9] =
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/* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */
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{ 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };
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static int div_table[9] =
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/* reg12 (BRG low) */
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{ 208, 138, 103, 50, 24, 11, 1, 0, 0 };
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int baud = cflag & CBAUD;
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int clksrc, clkmode, div, reg3, reg5;
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if (cflag & CBAUDEX)
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baud += B38400;
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if (baud < B1200 || baud > B38400+2)
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baud = B9600; /* use default 9600bps for non-implemented rates */
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baud -= B1200; /* tables starts at 1200bps */
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clksrc = clksrc_table[baud];
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clkmode = clkmode_table[baud];
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div = div_table[baud];
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if (ATARIHW_PRESENT(TT_MFP) && baud >= 6) {
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/* special treatment for TT, where rates >= 38400 are done via TRxC */
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clksrc = 0x28; /* TRxC */
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clkmode = baud == 6 ? 0xc0 :
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baud == 7 ? 0x80 : /* really 76800bps */
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0x40; /* really 153600bps */
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div = 0;
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}
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reg3 = (cflag & CSIZE) == CS8 ? 0xc0 : 0x40;
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reg5 = (cflag & CSIZE) == CS8 ? 0x60 : 0x20 | 0x82 /* assert DTR/RTS */;
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(void)atari_scc.cha_b_ctrl; /* reset reg pointer */
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SCC_WRITE(9, 0xc0); /* reset */
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LONG_DELAY(); /* extra delay after WR9 access */
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SCC_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03)
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: 0 | 0x04 /* 1 stopbit */ | clkmode);
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SCC_WRITE(3, reg3);
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SCC_WRITE(5, reg5);
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SCC_WRITE(9, 0); /* no interrupts */
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LONG_DELAY(); /* extra delay after WR9 access */
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SCC_WRITE(10, 0); /* NRZ mode */
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SCC_WRITE(11, clksrc); /* main clock source */
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SCC_WRITE(12, div); /* BRG value */
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SCC_WRITE(13, 0); /* BRG high byte */
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SCC_WRITE(14, brgsrc_table[baud]);
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SCC_WRITE(14, brgsrc_table[baud] | (div ? 1 : 0));
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SCC_WRITE(3, reg3 | 1);
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SCC_WRITE(5, reg5 | 8);
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atari_SCC_reset_done = 1;
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}
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static void __init atari_init_midi_port(int cflag)
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{
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int baud = cflag & CBAUD;
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int csize = ((cflag & CSIZE) == CS8) ? 0x10 : 0x00;
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/* warning 7N1 isn't possible! (instead 7O2 is used...) */
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int parity = (cflag & PARENB) ? ((cflag & PARODD) ? 0x0c : 0x08) : 0x04;
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int div;
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/* 4800 selects 7812.5, 115200 selects 500000, all other (incl. 9600 as
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* default) the standard MIDI speed 31250. */
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if (cflag & CBAUDEX)
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baud += B38400;
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if (baud == B4800)
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div = ACIA_DIV64; /* really 7812.5 bps */
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else if (baud == B38400+2 /* 115200 */)
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div = ACIA_DIV1; /* really 500 kbps (does that work??) */
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else
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div = ACIA_DIV16; /* 31250 bps, standard for MIDI */
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/* RTS low, ints disabled */
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acia.mid_ctrl = div | csize | parity |
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((atari_switches & ATARI_SWITCH_MIDI) ?
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ACIA_RHTID : ACIA_RLTID);
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}
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static int __init atari_debug_setup(char *arg)
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{
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bool registered;
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if (!MACH_IS_ATARI)
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return 0;
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if (!strcmp(arg, "ser"))
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/* defaults to ser2 for a Falcon and ser1 otherwise */
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arg = MACH_IS_FALCON ? "ser2" : "ser1";
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registered = !!atari_console_driver.write;
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if (!strcmp(arg, "ser1")) {
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/* ST-MFP Modem1 serial port */
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atari_init_mfp_port(B9600|CS8);
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atari_console_driver.write = atari_mfp_console_write;
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} else if (!strcmp(arg, "ser2")) {
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/* SCC Modem2 serial port */
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atari_init_scc_port(B9600|CS8);
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atari_console_driver.write = atari_scc_console_write;
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} else if (!strcmp(arg, "midi")) {
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/* MIDI port */
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atari_init_midi_port(B9600|CS8);
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atari_console_driver.write = atari_midi_console_write;
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} else if (!strcmp(arg, "par")) {
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/* parallel printer */
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atari_turnoff_irq(IRQ_MFP_BUSY); /* avoid ints */
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sound_ym.rd_data_reg_sel = 7; /* select mixer control */
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sound_ym.wd_data = 0xff; /* sound off, ports are output */
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sound_ym.rd_data_reg_sel = 15; /* select port B */
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sound_ym.wd_data = 0; /* no char */
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sound_ym.rd_data_reg_sel = 14; /* select port A */
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sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x20; /* strobe H */
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atari_console_driver.write = atari_par_console_write;
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}
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if (atari_console_driver.write && !registered)
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register_console(&atari_console_driver);
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return 0;
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}
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early_param("debug", atari_debug_setup);
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