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// SPDX-License-Identifier: GPL-2.0-only
/*
* 8250 serial console setup for the Realtek RTL838X SoC
*
* based on the original BSP by
* Copyright (C) 2006-2012 Tony Wu (tonywu@realtek.com)
*
* Copyright (C) 2020 B. Koblitz
*
*/
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
#include <linux/tty.h>
#include <linux/clk.h>
#include <asm/mach-rtl838x/mach-rtl838x.h>
extern char arcs_cmdline[];
extern struct rtl838x_soc_info soc_info;
int __init rtl838x_serial_init(void)
{
#ifdef CONFIG_SERIAL_8250
int ret;
struct uart_port p;
unsigned long baud = 0;
int err;
char parity = '\0', bits = '\0', flow = '\0';
char *s;
struct device_node *dn;
dn = of_find_compatible_node(NULL, NULL, "ns16550a");
if (dn) {
pr_info("Found NS16550a: %s (%s)\n", dn->name, dn->full_name);
dn = of_find_compatible_node(dn, NULL, "ns16550a");
if (dn && of_device_is_available(dn) && soc_info.family == RTL8380_FAMILY_ID) {
/* Enable UART1 on RTL838x */
pr_info("Enabling uart1\n");
sw_w32(0x10, RTL838X_GMII_INTF_SEL);
}
} else {
pr_err("No NS16550a UART found!");
return -ENODEV;
}
s = strstr(arcs_cmdline, "console=ttyS0,");
if (s) {
s += 14;
baud = kstrtoul(s, 10, &baud);
if (err)
baud = 0;
while (isdigit(*s))
s++;
if (*s == ',')
s++;
if (*s)
parity = *s++;
if (*s == ',')
s++;
if (*s)
bits = *s++;
if (*s == ',')
s++;
if (*s == 'h')
flow = 'r';
}
if (baud == 0) {
baud = 38400;
pr_warn("Using default baud rate: %lu\n", baud);
}
if (parity != 'n' && parity != 'o' && parity != 'e')
parity = 'n';
if (bits != '7' && bits != '8')
bits = '8';
memset(&p, 0, sizeof(p));
p.type = PORT_16550A;
p.membase = (unsigned char *) RTL838X_UART0_BASE;
p.irq = RTL838X_UART0_IRQ;
p.uartclk = SYSTEM_FREQ - (24 * baud);
p.flags = UPF_SKIP_TEST | UPF_LOW_LATENCY | UPF_FIXED_TYPE;
p.iotype = UPIO_MEM;
p.regshift = 2;
p.fifosize = 1;
/* Call early_serial_setup() here, to set up 8250 console driver */
if (early_serial_setup(&p) != 0)
ret = 1;
#endif
return 0;
}
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