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/*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <serial.h>
#include <watchdog.h>
#include <asm/cpm_8xx.h>
#include <linux/compiler.h>
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_8xx_CONS_SMC1) /* Console on SMC1 */
#define SMC_INDEX 0
#define PROFF_SMC PROFF_SMC1
#define CPM_CR_CH_SMC CPM_CR_CH_SMC1
#define IOPINS 0xc0
#elif defined(CONFIG_8xx_CONS_SMC2) /* Console on SMC2 */
#define SMC_INDEX 1
#define PROFF_SMC PROFF_SMC2
#define CPM_CR_CH_SMC CPM_CR_CH_SMC2
#define IOPINS 0xc00
#endif /* CONFIG_8xx_CONS_SMCx */
struct serialbuffer {
cbd_t rxbd; /* Rx BD */
cbd_t txbd; /* Tx BD */
uint rxindex; /* index for next character to read */
uchar rxbuf[CONFIG_SYS_SMC_RXBUFLEN];/* rx buffers */
uchar txbuf; /* tx buffers */
};
static void serial_setdivisor(cpm8xx_t __iomem *cp)
{
int divisor = (gd->cpu_clk + 8 * gd->baudrate) / 16 / gd->baudrate;
if (divisor / 16 > 0x1000) {
/* bad divisor, assume 50MHz clock and 9600 baud */
divisor = (50 * 1000 * 1000 + 8 * 9600) / 16 / 9600;
}
divisor /= CONFIG_SYS_BRGCLK_PRESCALE;
if (divisor <= 0x1000)
out_be32(&cp->cp_brgc1, ((divisor - 1) << 1) | CPM_BRG_EN);
else
out_be32(&cp->cp_brgc1, ((divisor / 16 - 1) << 1) | CPM_BRG_EN |
CPM_BRG_DIV16);
}
/*
* Minimal serial functions needed to use one of the SMC ports
* as serial console interface.
*/
static void smc_setbrg(void)
{
immap_t __iomem *im = (immap_t __iomem *)CONFIG_SYS_IMMR;
cpm8xx_t __iomem *cp = &(im->im_cpm);
/* Set up the baud rate generator.
* See 8xx_io/commproc.c for details.
*
* Wire BRG1 to SMCx
*/
out_be32(&cp->cp_simode, 0);
serial_setdivisor(cp);
}
static int smc_init(void)
{
immap_t __iomem *im = (immap_t __iomem *)CONFIG_SYS_IMMR;
smc_t __iomem *sp;
smc_uart_t __iomem *up;
cpm8xx_t __iomem *cp = &(im->im_cpm);
struct serialbuffer __iomem *rtx;
/* initialize pointers to SMC */
sp = cp->cp_smc + SMC_INDEX;
up = (smc_uart_t __iomem *)&cp->cp_dparam[PROFF_SMC];
/* Disable relocation */
out_be16(&up->smc_rpbase, 0);
/* Disable transmitter/receiver. */
clrbits_be16(&sp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
/* Enable SDMA. */
out_be32(&im->im_siu_conf.sc_sdcr, 1);
/* clear error conditions */
out_8(&im->im_sdma.sdma_sdsr, CONFIG_SYS_SDSR);
/* clear SDMA interrupt mask */
out_8(&im->im_sdma.sdma_sdmr, CONFIG_SYS_SDMR);
/* Use Port B for SMCx instead of other functions. */
setbits_be32(&cp->cp_pbpar, IOPINS);
clrbits_be32(&cp->cp_pbdir, IOPINS);
clrbits_be16(&cp->cp_pbodr, IOPINS);
/* Set the physical address of the host memory buffers in
* the buffer descriptors.
*/
rtx = (struct serialbuffer __iomem *)&cp->cp_dpmem[CPM_SERIAL_BASE];
/* 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
*/
out_be32(&rtx->rxbd.cbd_bufaddr, (__force uint)&rtx->rxbuf);
out_be16(&rtx->rxbd.cbd_sc, 0);
out_be32(&rtx->txbd.cbd_bufaddr, (__force uint)&rtx->txbuf);
out_be16(&rtx->txbd.cbd_sc, 0);
/* Set up the uart parameters in the parameter ram. */
out_be16(&up->smc_rbase, CPM_SERIAL_BASE);
out_be16(&up->smc_tbase, CPM_SERIAL_BASE + sizeof(cbd_t));
out_8(&up->smc_rfcr, SMC_EB);
out_8(&up->smc_tfcr, SMC_EB);
/* Set UART mode, 8 bit, no parity, one stop.
* Enable receive and transmit.
*/
out_be16(&sp->smc_smcmr, smcr_mk_clen(9) | SMCMR_SM_UART);
/* Mask all interrupts and remove anything pending.
*/
out_8(&sp->smc_smcm, 0);
out_8(&sp->smc_smce, 0xff);
/* Set up the baud rate generator */
smc_setbrg();
/* Make the first buffer the only buffer. */
setbits_be16(&rtx->txbd.cbd_sc, BD_SC_WRAP);
setbits_be16(&rtx->rxbd.cbd_sc, BD_SC_EMPTY | BD_SC_WRAP);
/* single/multi character receive. */
out_be16(&up->smc_mrblr, CONFIG_SYS_SMC_RXBUFLEN);
out_be16(&up->smc_maxidl, CONFIG_SYS_MAXIDLE);
out_be32(&rtx->rxindex, 0);
/* Initialize Tx/Rx parameters. */
while (in_be16(&cp->cp_cpcr) & CPM_CR_FLG) /* wait if cp is busy */
;
out_be16(&cp->cp_cpcr,
mk_cr_cmd(CPM_CR_CH_SMC, CPM_CR_INIT_TRX) | CPM_CR_FLG);
while (in_be16(&cp->cp_cpcr) & CPM_CR_FLG) /* wait if cp is busy */
;
/* Enable transmitter/receiver. */
setbits_be16(&sp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
return 0;
}
static void smc_putc(const char c)
{
immap_t __iomem *im = (immap_t __iomem *)CONFIG_SYS_IMMR;
cpm8xx_t __iomem *cpmp = &(im->im_cpm);
struct serialbuffer __iomem *rtx;
if (c == '\n')
smc_putc('\r');
rtx = (struct serialbuffer __iomem *)&cpmp->cp_dpmem[CPM_SERIAL_BASE];
/* Wait for last character to go. */
out_8(&rtx->txbuf, c);
out_be16(&rtx->txbd.cbd_datlen, 1);
setbits_be16(&rtx->txbd.cbd_sc, BD_SC_READY);
while (in_be16(&rtx->txbd.cbd_sc) & BD_SC_READY)
WATCHDOG_RESET();
}
static void smc_puts(const char *s)
{
while (*s)
smc_putc(*s++);
}
static int smc_getc(void)
{
immap_t __iomem *im = (immap_t __iomem *)CONFIG_SYS_IMMR;
cpm8xx_t __iomem *cpmp = &(im->im_cpm);
struct serialbuffer __iomem *rtx;
unsigned char c;
uint rxindex;
rtx = (struct serialbuffer __iomem *)&cpmp->cp_dpmem[CPM_SERIAL_BASE];
/* Wait for character to show up. */
while (in_be16(&rtx->rxbd.cbd_sc) & BD_SC_EMPTY)
WATCHDOG_RESET();
/* the characters are read one by one,
* use the rxindex to know the next char to deliver
*/
rxindex = in_be32(&rtx->rxindex);
c = in_8(rtx->rxbuf + rxindex);
rxindex++;
/* check if all char are readout, then make prepare for next receive */
if (rxindex >= in_be16(&rtx->rxbd.cbd_datlen)) {
rxindex = 0;
setbits_be16(&rtx->rxbd.cbd_sc, BD_SC_EMPTY);
}
out_be32(&rtx->rxindex, rxindex);
return c;
}
static int smc_tstc(void)
{
immap_t __iomem *im = (immap_t __iomem *)CONFIG_SYS_IMMR;
cpm8xx_t __iomem *cpmp = &(im->im_cpm);
struct serialbuffer __iomem *rtx;
rtx = (struct serialbuffer __iomem *)&cpmp->cp_dpmem[CPM_SERIAL_BASE];
return !(in_be16(&rtx->rxbd.cbd_sc) & BD_SC_EMPTY);
}
struct serial_device serial_smc_device = {
.name = "serial_smc",
.start = smc_init,
.stop = NULL,
.setbrg = smc_setbrg,
.getc = smc_getc,
.tstc = smc_tstc,
.putc = smc_putc,
.puts = smc_puts,
};
__weak struct serial_device *default_serial_console(void)
{
return &serial_smc_device;
}
void mpc8xx_serial_initialize(void)
{
serial_register(&serial_smc_device);
}
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