diff options
Diffstat (limited to 'board/gen860t/beeper.c')
| -rw-r--r-- | board/gen860t/beeper.c | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/board/gen860t/beeper.c b/board/gen860t/beeper.c deleted file mode 100644 index 0bebca9..0000000 --- a/board/gen860t/beeper.c +++ /dev/null @@ -1,183 +0,0 @@ -/* - * (C) Copyright 2002 - * Keith Outwater, keith_outwater@mvis.com - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <common.h> -#include <mpc8xx.h> -#include <asm/8xx_immap.h> -#include <linux/ctype.h> - -/* - * Basic beeper support for the GEN860T board. The GEN860T includes - * an audio sounder driven by a Phillips TDA8551 amplifier. The - * TDA8551 features a digital volume control which uses a "trinary" - * input (high/high-Z/low) to set volume. The 860's SPKROUT pin - * drives the amplifier input. - */ - -/* - * Initialize beeper-related hardware. Initialize timer 1 for use with - * the beeper. Use 66 MHz internal clock with prescale of 33 to get - * 1 uS period per count. - * FIXME: we should really compute the prescale based on the reported - * core clock frequency. - */ -void init_beeper (void) -{ - volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; - - immap->im_cpmtimer.cpmt_tgcr &= ~TGCR_RST1 | TGCR_STP1; - immap->im_cpmtimer.cpmt_tmr1 = ((33 << TMR_PS_SHIFT) & TMR_PS_MSK) - | TMR_OM | TMR_FRR | TMR_ICLK_IN_GEN; - immap->im_cpmtimer.cpmt_tcn1 = 0; - immap->im_cpmtimer.cpmt_ter1 = 0xffff; - immap->im_cpmtimer.cpmt_tgcr |= TGCR_RST1; -} - -/* - * Set beeper frequency. Max allowed frequency is 2.5 KHz. This limit - * is mostly arbitrary, but the beeper isn't really much good beyond this - * frequency. - */ -void set_beeper_frequency (uint frequency) -{ -#define FREQ_LIMIT 2500 - - volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; - - /* - * Compute timer ticks given desired frequency. The timer is set up - * to count 0.5 uS per tick and it takes two ticks per cycle (Hz). - */ - if (frequency > FREQ_LIMIT) - frequency = FREQ_LIMIT; - frequency = 1000000 / frequency; - immap->im_cpmtimer.cpmt_trr1 = (ushort) frequency; -} - -/* - * Turn the beeper on - */ -void beeper_on (void) -{ - volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; - - immap->im_cpmtimer.cpmt_tgcr &= ~TGCR_STP1; -} - -/* - * Turn the beeper off - */ -void beeper_off (void) -{ - volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; - - immap->im_cpmtimer.cpmt_tgcr |= TGCR_STP1; -} - -/* - * Increase or decrease the beeper volume. Volume can be set - * from off to full in 64 steps. To increase volume, the output - * pin is actively driven high, then returned to tristate. - * To decrease volume, output a low on the port pin (no need to - * change pin mode to tristate) then output a high to go back to - * tristate. - */ -void set_beeper_volume (int steps) -{ - volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; - int i; - - if (steps >= 0) { - for (i = 0; i < (steps >= 64 ? 64 : steps); i++) { - immap->im_cpm.cp_pbodr &= ~(0x80000000 >> 19); - udelay (1); - immap->im_cpm.cp_pbodr |= (0x80000000 >> 19); - udelay (1); - } - } else { - for (i = 0; i > (steps <= -64 ? -64 : steps); i--) { - immap->im_cpm.cp_pbdat &= ~(0x80000000 >> 19); - udelay (1); - immap->im_cpm.cp_pbdat |= (0x80000000 >> 19); - udelay (1); - } - } -} - -/* - * Check the environment to see if the beeper needs beeping. - * Controlled by a sequence of the form: - * freq/delta volume/on time/off time;... where: - * freq = frequency in Hz (0 - 2500) - * delta volume = volume steps up or down (-64 <= vol <= 64) - * on time = time in mS - * off time = time in mS - * - * Return 1 on success, 0 on failure - */ -int do_beeper (char *sequence) -{ -#define DELIMITER ';' - - int args[4]; - int i; - int val; - char *p = sequence; - char *tp; - - /* - * Parse the control sequence. This is a really simple parser - * without any real error checking. You can probably blow it - * up really easily. - */ - if (*p == '\0' || !isdigit (*p)) { - printf ("%s:%d: null or invalid string (%s)\n", - __FILE__, __LINE__, p); - return 0; - } - - i = 0; - while (*p != '\0') { - while (*p != DELIMITER) { - if (i > 3) - i = 0; - val = (int) simple_strtol (p, &tp, 0); - if (tp == p) { - printf ("%s:%d: no digits or bad format\n", - __FILE__, __LINE__); - return 0; - } else { - args[i] = val; - } - - i++; - if (*tp == DELIMITER) - p = tp; - else - p = ++tp; - } - p++; - - /* - * Well, we got something that has a chance of being correct - */ -#if 0 - for (i = 0; i < 4; i++) { - printf ("%s:%d:arg %d = %d\n", __FILE__, __LINE__, i, - args[i]); - } - printf ("\n"); -#endif - set_beeper_frequency (args[0]); - set_beeper_volume (args[1]); - beeper_on (); - udelay (1000 * args[2]); - beeper_off (); - udelay (1000 * args[3]); - } - return 1; -} |