fba69a5a30
This adds support for RTL839x SoCs in the ethernet and switch drivers of the rtl838x architecture. Reviewed-by: Andreas Oberritter <obi@saftware.de> Signed-off-by: Birger Koblitz <git@birger-koblitz.de>
101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* 8250 serial console setup for the Realtek RTL838X SoC
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*
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* based on the original BSP by
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* Copyright (C) 2006-2012 Tony Wu (tonywu@realtek.com)
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*
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* Copyright (C) 2020 B. Koblitz
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*
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*/
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#include <linux/types.h>
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#include <linux/ctype.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/version.h>
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#include <linux/serial.h>
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#include <linux/serial_core.h>
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#include <linux/serial_8250.h>
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#include <linux/serial_reg.h>
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#include <linux/tty.h>
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#include <linux/clk.h>
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#include <asm/mach-rtl838x/mach-rtl838x.h>
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extern char arcs_cmdline[];
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int __init rtl838x_serial_init(void)
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{
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#ifdef CONFIG_SERIAL_8250
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int ret;
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struct uart_port p;
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unsigned long baud = 0;
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int err;
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char parity = '\0', bits = '\0', flow = '\0';
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char *s;
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struct device_node *dn;
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dn = of_find_compatible_node(NULL, NULL, "ns16550a");
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if (dn) {
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pr_info("Found NS16550a: %s (%s)\n", dn->name, dn->full_name);
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dn = of_find_compatible_node(dn, NULL, "ns16550a");
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if (dn && of_device_is_available(dn) && soc_info.family == RTL8380_FAMILY_ID) {
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/* Enable UART1 on RTL838x */
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pr_info("Enabling uart1\n");
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sw_w32(0x10, RTL838X_GMII_INTF_SEL);
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}
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} else {
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pr_err("No NS16550a UART found!");
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return -ENODEV;
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}
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s = strstr(arcs_cmdline, "console=ttyS0,");
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if (s) {
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s += 14;
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err = kstrtoul(s, 10, &baud);
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if (err)
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baud = 0;
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while (isdigit(*s))
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s++;
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if (*s == ',')
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s++;
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if (*s)
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parity = *s++;
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if (*s == ',')
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s++;
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if (*s)
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bits = *s++;
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if (*s == ',')
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s++;
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if (*s == 'h')
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flow = 'r';
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}
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if (baud == 0) {
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baud = 38400;
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pr_warn("Using default baud rate: %lu\n", baud);
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}
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if (parity != 'n' && parity != 'o' && parity != 'e')
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parity = 'n';
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if (bits != '7' && bits != '8')
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bits = '8';
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memset(&p, 0, sizeof(p));
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p.type = PORT_16550A;
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p.membase = (unsigned char *) RTL838X_UART0_BASE;
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p.irq = RTL838X_UART0_IRQ;
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p.uartclk = SYSTEM_FREQ - (24 * baud);
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p.flags = UPF_SKIP_TEST | UPF_LOW_LATENCY | UPF_FIXED_TYPE;
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p.iotype = UPIO_MEM;
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p.regshift = 2;
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p.fifosize = 1;
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/* Call early_serial_setup() here, to set up 8250 console driver */
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if (early_serial_setup(&p) != 0)
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ret = 1;
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#endif
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return 0;
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}
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