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/*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
/* Modified by Udi Finkelstein
*
* This file includes communication routines for SMC1 that can run even if
* SMC2 have already been initialized.
*/
#include <common.h>
#include <watchdog.h>
#include <commproc.h>
#include <stdio_dev.h>
#include <lcd.h>
DECLARE_GLOBAL_DATA_PTR;
#define SMC_INDEX 0
#define PROFF_SMC PROFF_SMC1
#define CPM_CR_CH_SMC CPM_CR_CH_SMC1
#define RBC823_KBD_BAUDRATE 38400
#define CPM_KEYBOARD_BASE 0x1000
/*
* Minimal serial functions needed to use one of the SMC ports
* as serial console interface.
*/
void smc1_setbrg (void)
{
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile cpm8xx_t *cp = &(im->im_cpm);
/* Set up the baud rate generator.
* See 8xx_io/commproc.c for details.
*
* Wire BRG2 to SMC1, BRG1 to SMC2
*/
cp->cp_simode = 0x00001000;
cp->cp_brgc2 =
(((gd->cpu_clk / 16 / RBC823_KBD_BAUDRATE)-1) << 1) | CPM_BRG_EN;
}
int smc1_init (void)
{
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile smc_t *sp;
volatile smc_uart_t *up;
volatile cbd_t *tbdf, *rbdf;
volatile cpm8xx_t *cp = &(im->im_cpm);
uint dpaddr;
/* initialize pointers to SMC */
sp = (smc_t *) &(cp->cp_smc[SMC_INDEX]);
up = (smc_uart_t *) &cp->cp_dparam[PROFF_SMC];
/* Disable transmitter/receiver.
*/
sp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
/* Enable SDMA.
*/
im->im_siu_conf.sc_sdcr = 1;
/* clear error conditions */
#ifdef CONFIG_SYS_SDSR
im->im_sdma.sdma_sdsr = CONFIG_SYS_SDSR;
#else
im->im_sdma.sdma_sdsr = 0x83;
#endif
/* clear SDMA interrupt mask */
#ifdef CONFIG_SYS_SDMR
im->im_sdma.sdma_sdmr = CONFIG_SYS_SDMR;
#else
im->im_sdma.sdma_sdmr = 0x00;
#endif
/* Use Port B for SMC1 instead of other functions.
*/
cp->cp_pbpar |= 0x000000c0;
cp->cp_pbdir &= ~0x000000c0;
cp->cp_pbodr &= ~0x000000c0;
/* Set the physical address of the host memory buffers in
* the buffer descriptors.
*/
#ifdef CONFIG_SYS_ALLOC_DPRAM
dpaddr = dpram_alloc_align (sizeof(cbd_t)*2 + 2, 8) ;
#else
dpaddr = CPM_KEYBOARD_BASE ;
#endif
/* Allocate space for two buffer descriptors in the DP ram.
* For now, this address seems OK, but it may have to
* change with newer versions of the firmware.
* damm: allocating space after the two buffers for rx/tx data
*/
rbdf = (cbd_t *)&cp->cp_dpmem[dpaddr];
rbdf->cbd_bufaddr = (uint) (rbdf+2);
rbdf->cbd_sc = 0;
tbdf = rbdf + 1;
tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1;
tbdf->cbd_sc = 0;
/* Set up the uart parameters in the parameter ram.
*/
up->smc_rbase = dpaddr;
up->smc_tbase = dpaddr+sizeof(cbd_t);
up->smc_rfcr = SMC_EB;
up->smc_tfcr = SMC_EB;
/* Set UART mode, 8 bit, no parity, one stop.
* Enable receive and transmit.
*/
sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART;
/* Mask all interrupts and remove anything pending.
*/
sp->smc_smcm = 0;
sp->smc_smce = 0xff;
/* Set up the baud rate generator.
*/
smc1_setbrg ();
/* Make the first buffer the only buffer.
*/
tbdf->cbd_sc |= BD_SC_WRAP;
rbdf->cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP;
/* Single character receive.
*/
up->smc_mrblr = 1;
up->smc_maxidl = 0;
/* Initialize Tx/Rx parameters.
*/
while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
;
cp->cp_cpcr = mk_cr_cmd(CPM_CR_CH_SMC, CPM_CR_INIT_TRX) | CPM_CR_FLG;
while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
;
/* Enable transmitter/receiver.
*/
sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
return (0);
}
void smc1_putc(const char c)
{
volatile cbd_t *tbdf;
volatile char *buf;
volatile smc_uart_t *up;
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile cpm8xx_t *cpmp = &(im->im_cpm);
up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_SMC];
tbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_tbase];
/* Wait for last character to go.
*/
buf = (char *)tbdf->cbd_bufaddr;
*buf = c;
tbdf->cbd_datlen = 1;
tbdf->cbd_sc |= BD_SC_READY;
__asm__("eieio");
while (tbdf->cbd_sc & BD_SC_READY) {
WATCHDOG_RESET ();
__asm__("eieio");
}
}
int smc1_getc(void)
{
volatile cbd_t *rbdf;
volatile unsigned char *buf;
volatile smc_uart_t *up;
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile cpm8xx_t *cpmp = &(im->im_cpm);
unsigned char c;
up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_SMC];
rbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase];
/* Wait for character to show up.
*/
buf = (unsigned char *)rbdf->cbd_bufaddr;
while (rbdf->cbd_sc & BD_SC_EMPTY)
WATCHDOG_RESET ();
c = *buf;
rbdf->cbd_sc |= BD_SC_EMPTY;
return(c);
}
int smc1_tstc(void)
{
volatile cbd_t *rbdf;
volatile smc_uart_t *up;
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile cpm8xx_t *cpmp = &(im->im_cpm);
up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_SMC];
rbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase];
return(!(rbdf->cbd_sc & BD_SC_EMPTY));
}
/* search for keyboard and register it if found */
int drv_keyboard_init(void)
{
int error = 0;
struct stdio_dev kbd_dev;
if (0) {
/* register the keyboard */
memset (&kbd_dev, 0, sizeof(struct stdio_dev));
strcpy(kbd_dev.name, "kbd");
kbd_dev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
kbd_dev.putc = NULL;
kbd_dev.puts = NULL;
kbd_dev.getc = smc1_getc;
kbd_dev.tstc = smc1_tstc;
error = stdio_register (&kbd_dev);
} else {
lcd_is_enabled = 0;
lcd_disable();
}
return error;
}
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