Contributors: 26
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Peter Hurley |
598 |
40.65% |
14 |
29.79% |
| Rob Herring |
582 |
39.56% |
5 |
10.64% |
| Ricardo Ribalda Delgado |
47 |
3.20% |
1 |
2.13% |
| Michael Walle |
39 |
2.65% |
2 |
4.26% |
| Aleksey Makarov |
25 |
1.70% |
1 |
2.13% |
| Masahiro Yamada |
24 |
1.63% |
1 |
2.13% |
| Noam Camus |
21 |
1.43% |
1 |
2.13% |
| Hsin-Yi, Wang |
17 |
1.16% |
1 |
2.13% |
| Geert Uytterhoeven |
16 |
1.09% |
1 |
2.13% |
| Laura Abbott |
12 |
0.82% |
1 |
2.13% |
| Kevin Cernekee |
12 |
0.82% |
1 |
2.13% |
| Linus Torvalds (pre-git) |
12 |
0.82% |
2 |
4.26% |
| Kumar Gala |
10 |
0.68% |
1 |
2.13% |
| John Ogness |
8 |
0.54% |
1 |
2.13% |
| Eugeniy Paltsev |
7 |
0.48% |
1 |
2.13% |
| Stephen Neuendorffer |
6 |
0.41% |
1 |
2.13% |
| Grant C. Likely |
6 |
0.41% |
2 |
4.26% |
| Jeffy Chen |
5 |
0.34% |
1 |
2.13% |
| Michal Simek |
4 |
0.27% |
1 |
2.13% |
| Alexander Sverdlin |
4 |
0.27% |
1 |
2.13% |
| Prarit Bhargava |
4 |
0.27% |
1 |
2.13% |
| Johan Hovold |
4 |
0.27% |
1 |
2.13% |
| Wolfram Sang |
3 |
0.20% |
1 |
2.13% |
| Leif Lindholm |
2 |
0.14% |
1 |
2.13% |
| Greg Kroah-Hartman |
2 |
0.14% |
2 |
4.26% |
| Jeremy Kerr |
1 |
0.07% |
1 |
2.13% |
| Total |
1471 |
|
47 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2014 Linaro Ltd.
* Author: Rob Herring <robh@kernel.org>
*
* Based on 8250 earlycon:
* (c) Copyright 2004 Hewlett-Packard Development Company, L.P.
* Bjorn Helgaas <bjorn.helgaas@hp.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/console.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/serial_core.h>
#include <linux/sizes.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/acpi.h>
#ifdef CONFIG_FIX_EARLYCON_MEM
#include <asm/fixmap.h>
#endif
#include <asm/serial.h>
static struct console early_con = {
.name = "uart", /* fixed up at earlycon registration */
.flags = CON_PRINTBUFFER | CON_BOOT,
.index = 0,
};
static struct earlycon_device early_console_dev = {
.con = &early_con,
};
static void __iomem * __init earlycon_map(resource_size_t paddr, size_t size)
{
void __iomem *base;
#ifdef CONFIG_FIX_EARLYCON_MEM
set_fixmap_io(FIX_EARLYCON_MEM_BASE, paddr & PAGE_MASK);
base = (void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
base += paddr & ~PAGE_MASK;
#else
base = ioremap(paddr, size);
#endif
if (!base)
pr_err("%s: Couldn't map %pa\n", __func__, &paddr);
return base;
}
static void __init earlycon_init(struct earlycon_device *device,
const char *name)
{
struct console *earlycon = device->con;
const char *s;
size_t len;
/* scan backwards from end of string for first non-numeral */
for (s = name + strlen(name);
s > name && s[-1] >= '0' && s[-1] <= '9';
s--)
;
if (*s)
earlycon->index = simple_strtoul(s, NULL, 10);
len = s - name;
strscpy(earlycon->name, name, min(len + 1, sizeof(earlycon->name)));
earlycon->data = &early_console_dev;
}
static void __init earlycon_print_info(struct earlycon_device *device)
{
struct console *earlycon = device->con;
struct uart_port *port = &device->port;
if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM16 ||
port->iotype == UPIO_MEM32 || port->iotype == UPIO_MEM32BE)
pr_info("%s%d at MMIO%s %pa (options '%s')\n",
earlycon->name, earlycon->index,
(port->iotype == UPIO_MEM) ? "" :
(port->iotype == UPIO_MEM16) ? "16" :
(port->iotype == UPIO_MEM32) ? "32" : "32be",
&port->mapbase, device->options);
else
pr_info("%s%d at I/O port 0x%lx (options '%s')\n",
earlycon->name, earlycon->index,
port->iobase, device->options);
}
static int __init parse_options(struct earlycon_device *device, char *options)
{
struct uart_port *port = &device->port;
int length;
resource_size_t addr;
if (uart_parse_earlycon(options, &port->iotype, &addr, &options))
return -EINVAL;
switch (port->iotype) {
case UPIO_MEM:
port->mapbase = addr;
break;
case UPIO_MEM16:
port->regshift = 1;
port->mapbase = addr;
break;
case UPIO_MEM32:
case UPIO_MEM32BE:
port->regshift = 2;
port->mapbase = addr;
break;
case UPIO_PORT:
port->iobase = addr;
break;
default:
return -EINVAL;
}
if (options) {
char *uartclk;
device->baud = simple_strtoul(options, NULL, 0);
uartclk = strchr(options, ',');
if (uartclk && kstrtouint(uartclk + 1, 0, &port->uartclk) < 0)
pr_warn("[%s] unsupported earlycon uart clkrate option\n",
options);
length = min(strcspn(options, " ") + 1,
(size_t)(sizeof(device->options)));
strscpy(device->options, options, length);
}
return 0;
}
static int __init register_earlycon(char *buf, const struct earlycon_id *match)
{
int err;
struct uart_port *port = &early_console_dev.port;
/* On parsing error, pass the options buf to the setup function */
if (buf && !parse_options(&early_console_dev, buf))
buf = NULL;
spin_lock_init(&port->lock);
if (!port->uartclk)
port->uartclk = BASE_BAUD * 16;
if (port->mapbase)
port->membase = earlycon_map(port->mapbase, 64);
earlycon_init(&early_console_dev, match->name);
err = match->setup(&early_console_dev, buf);
earlycon_print_info(&early_console_dev);
if (err < 0)
return err;
if (!early_console_dev.con->write)
return -ENODEV;
register_console(early_console_dev.con);
return 0;
}
/**
* setup_earlycon - match and register earlycon console
* @buf: earlycon param string
*
* Registers the earlycon console matching the earlycon specified
* in the param string @buf. Acceptable param strings are of the form
* <name>,io|mmio|mmio32|mmio32be,<addr>,<options>
* <name>,0x<addr>,<options>
* <name>,<options>
* <name>
*
* Only for the third form does the earlycon setup() method receive the
* <options> string in the 'options' parameter; all other forms set
* the parameter to NULL.
*
* Returns 0 if an attempt to register the earlycon was made,
* otherwise negative error code
*/
int __init setup_earlycon(char *buf)
{
const struct earlycon_id *match;
bool empty_compatible = true;
if (!buf || !buf[0])
return -EINVAL;
if (console_is_registered(&early_con))
return -EALREADY;
again:
for (match = __earlycon_table; match < __earlycon_table_end; match++) {
size_t len = strlen(match->name);
if (strncmp(buf, match->name, len))
continue;
/* prefer entries with empty compatible */
if (empty_compatible && *match->compatible)
continue;
if (buf[len]) {
if (buf[len] != ',')
continue;
buf += len + 1;
} else
buf = NULL;
return register_earlycon(buf, match);
}
if (empty_compatible) {
empty_compatible = false;
goto again;
}
return -ENOENT;
}
/*
* This defers the initialization of the early console until after ACPI has
* been initialized.
*/
bool earlycon_acpi_spcr_enable __initdata;
/* early_param wrapper for setup_earlycon() */
static int __init param_setup_earlycon(char *buf)
{
int err;
/* Just 'earlycon' is a valid param for devicetree and ACPI SPCR. */
if (!buf || !buf[0]) {
if (IS_ENABLED(CONFIG_ACPI_SPCR_TABLE)) {
earlycon_acpi_spcr_enable = true;
return 0;
} else if (!buf) {
return early_init_dt_scan_chosen_stdout();
}
}
err = setup_earlycon(buf);
if (err == -ENOENT || err == -EALREADY)
return 0;
return err;
}
early_param("earlycon", param_setup_earlycon);
#ifdef CONFIG_OF_EARLY_FLATTREE
int __init of_setup_earlycon(const struct earlycon_id *match,
unsigned long node,
const char *options)
{
int err;
struct uart_port *port = &early_console_dev.port;
const __be32 *val;
bool big_endian;
u64 addr;
if (console_is_registered(&early_con))
return -EALREADY;
spin_lock_init(&port->lock);
port->iotype = UPIO_MEM;
addr = of_flat_dt_translate_address(node);
if (addr == OF_BAD_ADDR) {
pr_warn("[%s] bad address\n", match->name);
return -ENXIO;
}
port->mapbase = addr;
val = of_get_flat_dt_prop(node, "reg-offset", NULL);
if (val)
port->mapbase += be32_to_cpu(*val);
port->membase = earlycon_map(port->mapbase, SZ_4K);
val = of_get_flat_dt_prop(node, "reg-shift", NULL);
if (val)
port->regshift = be32_to_cpu(*val);
big_endian = of_get_flat_dt_prop(node, "big-endian", NULL) != NULL ||
(IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) &&
of_get_flat_dt_prop(node, "native-endian", NULL) != NULL);
val = of_get_flat_dt_prop(node, "reg-io-width", NULL);
if (val) {
switch (be32_to_cpu(*val)) {
case 1:
port->iotype = UPIO_MEM;
break;
case 2:
port->iotype = UPIO_MEM16;
break;
case 4:
port->iotype = (big_endian) ? UPIO_MEM32BE : UPIO_MEM32;
break;
default:
pr_warn("[%s] unsupported reg-io-width\n", match->name);
return -EINVAL;
}
}
val = of_get_flat_dt_prop(node, "current-speed", NULL);
if (val)
early_console_dev.baud = be32_to_cpu(*val);
val = of_get_flat_dt_prop(node, "clock-frequency", NULL);
if (val)
port->uartclk = be32_to_cpu(*val);
if (options) {
early_console_dev.baud = simple_strtoul(options, NULL, 0);
strscpy(early_console_dev.options, options,
sizeof(early_console_dev.options));
}
earlycon_init(&early_console_dev, match->name);
err = match->setup(&early_console_dev, options);
earlycon_print_info(&early_console_dev);
if (err < 0)
return err;
if (!early_console_dev.con->write)
return -ENODEV;
register_console(early_console_dev.con);
return 0;
}
#endif /* CONFIG_OF_EARLY_FLATTREE */