u-boot/arch/powerpc/cpu/mpc512x/serial.c

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/*
* (C) Copyright 2000 - 2010
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*
* Based ont the MPC5200 PSC driver.
* Adapted for MPC512x by Jan Wrobel <wrr@semihalf.com>
*/
/*
* Minimal serial functions needed to use one of the PSC ports
* as serial console interface.
*/
#include <common.h>
#include <linux/compiler.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <serial.h>
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_PSC_CONSOLE)
static void fifo_init (volatile psc512x_t *psc)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
u32 tfsize, rfsize;
/* reset Rx & Tx fifo slice */
out_be32(&psc->rfcmd, PSC_FIFO_RESET_SLICE);
out_be32(&psc->tfcmd, PSC_FIFO_RESET_SLICE);
/* disable Tx & Rx FIFO interrupts */
out_be32(&psc->rfintmask, 0);
out_be32(&psc->tfintmask, 0);
switch (((u32)psc & 0xf00) >> 8) {
case 0:
tfsize = FIFOC_PSC0_TX_SIZE | (FIFOC_PSC0_TX_ADDR << 16);
rfsize = FIFOC_PSC0_RX_SIZE | (FIFOC_PSC0_RX_ADDR << 16);
break;
case 1:
tfsize = FIFOC_PSC1_TX_SIZE | (FIFOC_PSC1_TX_ADDR << 16);
rfsize = FIFOC_PSC1_RX_SIZE | (FIFOC_PSC1_RX_ADDR << 16);
break;
case 2:
tfsize = FIFOC_PSC2_TX_SIZE | (FIFOC_PSC2_TX_ADDR << 16);
rfsize = FIFOC_PSC2_RX_SIZE | (FIFOC_PSC2_RX_ADDR << 16);
break;
case 3:
tfsize = FIFOC_PSC3_TX_SIZE | (FIFOC_PSC3_TX_ADDR << 16);
rfsize = FIFOC_PSC3_RX_SIZE | (FIFOC_PSC3_RX_ADDR << 16);
break;
case 4:
tfsize = FIFOC_PSC4_TX_SIZE | (FIFOC_PSC4_TX_ADDR << 16);
rfsize = FIFOC_PSC4_RX_SIZE | (FIFOC_PSC4_RX_ADDR << 16);
break;
case 5:
tfsize = FIFOC_PSC5_TX_SIZE | (FIFOC_PSC5_TX_ADDR << 16);
rfsize = FIFOC_PSC5_RX_SIZE | (FIFOC_PSC5_RX_ADDR << 16);
break;
case 6:
tfsize = FIFOC_PSC6_TX_SIZE | (FIFOC_PSC6_TX_ADDR << 16);
rfsize = FIFOC_PSC6_RX_SIZE | (FIFOC_PSC6_RX_ADDR << 16);
break;
case 7:
tfsize = FIFOC_PSC7_TX_SIZE | (FIFOC_PSC7_TX_ADDR << 16);
rfsize = FIFOC_PSC7_RX_SIZE | (FIFOC_PSC7_RX_ADDR << 16);
break;
case 8:
tfsize = FIFOC_PSC8_TX_SIZE | (FIFOC_PSC8_TX_ADDR << 16);
rfsize = FIFOC_PSC8_RX_SIZE | (FIFOC_PSC8_RX_ADDR << 16);
break;
case 9:
tfsize = FIFOC_PSC9_TX_SIZE | (FIFOC_PSC9_TX_ADDR << 16);
rfsize = FIFOC_PSC9_RX_SIZE | (FIFOC_PSC9_RX_ADDR << 16);
break;
case 10:
tfsize = FIFOC_PSC10_TX_SIZE | (FIFOC_PSC10_TX_ADDR << 16);
rfsize = FIFOC_PSC10_RX_SIZE | (FIFOC_PSC10_RX_ADDR << 16);
break;
case 11:
tfsize = FIFOC_PSC11_TX_SIZE | (FIFOC_PSC11_TX_ADDR << 16);
rfsize = FIFOC_PSC11_RX_SIZE | (FIFOC_PSC11_RX_ADDR << 16);
break;
default:
return;
}
out_be32(&psc->tfsize, tfsize);
out_be32(&psc->rfsize, rfsize);
/* enable Tx & Rx FIFO slice */
out_be32(&psc->rfcmd, PSC_FIFO_ENABLE_SLICE);
out_be32(&psc->tfcmd, PSC_FIFO_ENABLE_SLICE);
out_be32(&im->fifoc.fifoc_cmd, FIFOC_DISABLE_CLOCK_GATE);
__asm__ volatile ("sync");
}
void serial_setbrg_dev(unsigned int idx)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
unsigned long baseclk, div;
unsigned long baudrate;
char buf[16];
char *br_env;
baudrate = gd->baudrate;
if (idx != CONFIG_PSC_CONSOLE) {
/* Allows setting baudrate for other serial devices
* on PSCx using environment. If not specified, use
* the same baudrate as for console.
*/
sprintf(buf, "psc%d_baudrate", idx);
br_env = getenv(buf);
if (br_env)
baudrate = simple_strtoul(br_env, NULL, 10);
debug("%s: idx %d, baudrate %ld\n", __func__, idx, baudrate);
}
/* calculate divisor for setting PSC CTUR and CTLR registers */
baseclk = (gd->arch.ips_clk + 8) / 16;
div = (baseclk + (baudrate / 2)) / baudrate;
out_8(&psc->ctur, (div >> 8) & 0xff);
out_8(&psc->ctlr, div & 0xff); /* set baudrate */
}
int serial_init_dev(unsigned int idx)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
u32 reg;
reg = in_be32(&im->clk.sccr[0]);
out_be32(&im->clk.sccr[0], reg | CLOCK_SCCR1_PSC_EN(idx));
fifo_init (psc);
/* set MR register to point to MR1 */
out_8(&psc->command, PSC_SEL_MODE_REG_1);
/* disable Tx/Rx */
out_8(&psc->command, PSC_TX_DISABLE | PSC_RX_DISABLE);
/* choose the prescaler by 16 for the Tx/Rx clock generation */
out_be16(&psc->psc_clock_select, 0xdd00);
/* switch to UART mode */
out_be32(&psc->sicr, 0);
/* mode register points to mr1 */
/* configure parity, bit length and so on in mode register 1*/
out_8(&psc->mode, PSC_MODE_8_BITS | PSC_MODE_PARNONE);
/* now, mode register points to mr2 */
out_8(&psc->mode, PSC_MODE_1_STOPBIT);
/* set baudrate */
serial_setbrg_dev(idx);
/* disable all interrupts */
out_be16(&psc->psc_imr, 0);
/* reset and enable Rx/Tx */
out_8(&psc->command, PSC_RST_RX);
out_8(&psc->command, PSC_RST_TX);
out_8(&psc->command, PSC_RX_ENABLE | PSC_TX_ENABLE);
return 0;
}
int serial_uninit_dev(unsigned int idx)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
u32 reg;
out_8(&psc->command, PSC_RX_DISABLE | PSC_TX_DISABLE);
reg = in_be32(&im->clk.sccr[0]);
reg &= ~CLOCK_SCCR1_PSC_EN(idx);
out_be32(&im->clk.sccr[0], reg);
return 0;
}
void serial_putc_dev(unsigned int idx, const char c)
{
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
if (c == '\n')
serial_putc_dev(idx, '\r');
/* Wait for last character to go. */
while (!(in_be16(&psc->psc_status) & PSC_SR_TXEMP))
;
out_8(&psc->tfdata_8, c);
}
void serial_puts_dev(unsigned int idx, const char *s)
{
while (*s)
serial_putc_dev(idx, *s++);
}
int serial_getc_dev(unsigned int idx)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
/* Wait for a character to arrive. */
while (in_be32(&psc->rfstat) & PSC_FIFO_EMPTY)
;
return in_8(&psc->rfdata_8);
}
int serial_tstc_dev(unsigned int idx)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
return !(in_be32(&psc->rfstat) & PSC_FIFO_EMPTY);
}
void serial_setrts_dev(unsigned int idx, int s)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
if (s) {
/* Assert RTS (become LOW) */
out_8(&psc->op1, 0x1);
}
else {
/* Negate RTS (become HIGH) */
out_8(&psc->op0, 0x1);
}
}
int serial_getcts_dev(unsigned int idx)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
return (in_8(&psc->ip) & 0x1) ? 0 : 1;
}
#endif /* CONFIG_PSC_CONSOLE */
#define DECLARE_PSC_SERIAL_FUNCTIONS(port) \
int serial##port##_init(void) \
{ \
return serial_init_dev(port); \
} \
int serial##port##_uninit(void) \
{ \
return serial_uninit_dev(port); \
} \
void serial##port##_setbrg(void) \
{ \
serial_setbrg_dev(port); \
} \
int serial##port##_getc(void) \
{ \
return serial_getc_dev(port); \
} \
int serial##port##_tstc(void) \
{ \
return serial_tstc_dev(port); \
} \
void serial##port##_putc(const char c) \
{ \
serial_putc_dev(port, c); \
} \
void serial##port##_puts(const char *s) \
{ \
serial_puts_dev(port, s); \
}
#define INIT_PSC_SERIAL_STRUCTURE(port, __name) { \
.name = __name, \
.start = serial##port##_init, \
.stop = serial##port##_uninit, \
.setbrg = serial##port##_setbrg, \
.getc = serial##port##_getc, \
.tstc = serial##port##_tstc, \
.putc = serial##port##_putc, \
.puts = serial##port##_puts, \
}
#if defined(CONFIG_SYS_PSC1)
DECLARE_PSC_SERIAL_FUNCTIONS(1);
struct serial_device serial1_device =
INIT_PSC_SERIAL_STRUCTURE(1, "psc1");
#endif
#if defined(CONFIG_SYS_PSC3)
DECLARE_PSC_SERIAL_FUNCTIONS(3);
struct serial_device serial3_device =
INIT_PSC_SERIAL_STRUCTURE(3, "psc3");
#endif
#if defined(CONFIG_SYS_PSC4)
DECLARE_PSC_SERIAL_FUNCTIONS(4);
struct serial_device serial4_device =
INIT_PSC_SERIAL_STRUCTURE(4, "psc4");
#endif
#if defined(CONFIG_SYS_PSC6)
DECLARE_PSC_SERIAL_FUNCTIONS(6);
struct serial_device serial6_device =
INIT_PSC_SERIAL_STRUCTURE(6, "psc6");
#endif
__weak struct serial_device *default_serial_console(void)
{
#if (CONFIG_PSC_CONSOLE == 3)
return &serial3_device;
#elif (CONFIG_PSC_CONSOLE == 6)
return &serial6_device;
#else
#error "invalid CONFIG_PSC_CONSOLE"
#endif
}
void mpc512x_serial_initialize(void)
{
#if defined(CONFIG_SYS_PSC1)
serial_register(&serial1_device);
#endif
#if defined(CONFIG_SYS_PSC3)
serial_register(&serial3_device);
#endif
#if defined(CONFIG_SYS_PSC4)
serial_register(&serial4_device);
#endif
#if defined(CONFIG_SYS_PSC6)
serial_register(&serial6_device);
#endif
}
#include <stdio_dev.h>
/*
* Routines for communication with serial devices over PSC
*/
/* Bitfield for initialized PSCs */
static unsigned int initialized;
struct stdio_dev *open_port(int num, int baudrate)
{
struct stdio_dev *port;
char env_var[16];
char env_val[10];
char name[7];
if (num < 0 || num > 11)
return NULL;
sprintf(name, "psc%d", num);
port = stdio_get_by_name(name);
if (!port)
return NULL;
if (!test_bit(num, &initialized)) {
sprintf(env_var, "psc%d_baudrate", num);
sprintf(env_val, "%d", baudrate);
setenv(env_var, env_val);
if (port->start(port))
return NULL;
set_bit(num, &initialized);
}
return port;
}
int close_port(int num)
{
struct stdio_dev *port;
int ret;
char name[7];
if (num < 0 || num > 11)
return -1;
sprintf(name, "psc%d", num);
port = stdio_get_by_name(name);
if (!port)
return -1;
ret = port->stop(port);
clear_bit(num, &initialized);
return ret;
}
int write_port(struct stdio_dev *port, char *buf)
{
if (!port || !buf)
return -1;
port->puts(port, buf);
return 0;
}
int read_port(struct stdio_dev *port, char *buf, int size)
{
int cnt = 0;
if (!port || !buf)
return -1;
if (!size)
return 0;
while (port->tstc(port)) {
buf[cnt++] = port->getc(port);
if (cnt > size)
break;
}
return cnt;
}