Contributors: 59
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Arnd Bergmann |
479 |
26.96% |
2 |
2.41% |
| Andy Shevchenko |
174 |
9.79% |
6 |
7.23% |
| Bastien Curutchet |
156 |
8.78% |
1 |
1.20% |
| Jingchang Lu |
143 |
8.05% |
2 |
2.41% |
| Franklin S Cooper Jr |
77 |
4.33% |
1 |
1.20% |
| Ishizaki Kou |
71 |
4.00% |
1 |
1.20% |
| Joel Stanley |
62 |
3.49% |
2 |
2.41% |
| John Garry |
62 |
3.49% |
2 |
2.41% |
| Grant C. Likely |
61 |
3.43% |
9 |
10.84% |
| Murali Karicheri |
50 |
2.81% |
1 |
1.20% |
| Thor Thayer |
39 |
2.19% |
1 |
1.20% |
| Heikki Krogerus |
37 |
2.08% |
1 |
1.20% |
| Scott Wood |
28 |
1.58% |
1 |
1.20% |
| Ley Foon Tan |
24 |
1.35% |
1 |
1.20% |
| Darwin Dingel |
19 |
1.07% |
1 |
1.20% |
| Ilpo Järvinen |
17 |
0.96% |
2 |
2.41% |
| Rob Herring |
16 |
0.90% |
2 |
2.41% |
| Jim Quinlan |
16 |
0.90% |
1 |
1.20% |
| John Crispin |
15 |
0.84% |
1 |
1.20% |
| Lukas Wunner |
15 |
0.84% |
2 |
2.41% |
| Alan Cox |
13 |
0.73% |
1 |
1.20% |
| Wei Yongjun |
12 |
0.68% |
1 |
1.20% |
| David Lechner |
11 |
0.62% |
1 |
1.20% |
| Dmitry Safonov |
11 |
0.62% |
1 |
1.20% |
| Jamie Iles |
11 |
0.62% |
1 |
1.20% |
| Peter Hurley |
10 |
0.56% |
1 |
1.20% |
| Yinghai Lu |
10 |
0.56% |
1 |
1.20% |
| Måns Rullgård |
10 |
0.56% |
1 |
1.20% |
| Robert Hancock |
9 |
0.51% |
1 |
1.20% |
| Eric Tremblay |
8 |
0.45% |
1 |
1.20% |
| Russell King |
8 |
0.45% |
2 |
2.41% |
| Matthias Fuchs |
8 |
0.45% |
1 |
1.20% |
| Michal Simek |
8 |
0.45% |
1 |
1.20% |
| Sean Wang |
8 |
0.45% |
1 |
1.20% |
| Greg Kroah-Hartman |
7 |
0.39% |
3 |
3.61% |
| Luis de Bethencourt |
7 |
0.39% |
1 |
1.20% |
| Dongsheng Wang |
6 |
0.34% |
1 |
1.20% |
| Alexey Khoroshilov |
5 |
0.28% |
1 |
1.20% |
| Heiko Schocher |
5 |
0.28% |
1 |
1.20% |
| Masahiro Yamada |
5 |
0.28% |
1 |
1.20% |
| Max Asbock |
5 |
0.28% |
1 |
1.20% |
| Dan J Williams |
5 |
0.28% |
1 |
1.20% |
| Lubomir Rintel |
4 |
0.23% |
1 |
1.20% |
| Jonathan Neuschäfer |
4 |
0.23% |
1 |
1.20% |
| Roland Stigge |
4 |
0.23% |
1 |
1.20% |
| Benjamin Herrenschmidt |
3 |
0.17% |
1 |
1.20% |
| Uwe Kleine-König |
3 |
0.17% |
2 |
2.41% |
| Benjamin Krill |
2 |
0.11% |
1 |
1.20% |
| Christoph Hellwig |
2 |
0.11% |
1 |
1.20% |
| Jingoo Han |
2 |
0.11% |
1 |
1.20% |
| Linus Torvalds (pre-git) |
2 |
0.11% |
1 |
1.20% |
| Linus Torvalds |
1 |
0.06% |
1 |
1.20% |
| Sergei Shtylyov |
1 |
0.06% |
1 |
1.20% |
| Linus Walleij |
1 |
0.06% |
1 |
1.20% |
| Fabian Frederick |
1 |
0.06% |
1 |
1.20% |
| Stephen Warren |
1 |
0.06% |
1 |
1.20% |
| Alexander Sverdlin |
1 |
0.06% |
1 |
1.20% |
| John Linn |
1 |
0.06% |
1 |
1.20% |
| Peter Ujfalusi |
1 |
0.06% |
1 |
1.20% |
| Total |
1777 |
|
83 |
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Serial Port driver for Open Firmware platform devices
*
* Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>, IBM Corp.
*/
#include <linux/bits.h>
#include <linux/console.h>
#include <linux/math.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/clk.h>
#include <linux/reset.h>
#include <linux/notifier.h>
#include "8250.h"
struct of_serial_info {
struct clk *clk;
struct reset_control *rst;
int type;
int line;
struct notifier_block clk_notifier;
};
/* Nuvoton NPCM timeout register */
#define UART_NPCM_TOR 7
#define UART_NPCM_TOIE BIT(7) /* Timeout Interrupt Enable */
static int npcm_startup(struct uart_port *port)
{
/*
* Nuvoton calls the scratch register 'UART_TOR' (timeout
* register). Enable it, and set TIOC (timeout interrupt
* comparator) to be 0x20 for correct operation.
*/
serial_port_out(port, UART_NPCM_TOR, UART_NPCM_TOIE | 0x20);
return serial8250_do_startup(port);
}
/* Nuvoton NPCM UARTs have a custom divisor calculation */
static unsigned int npcm_get_divisor(struct uart_port *port, unsigned int baud,
unsigned int *frac)
{
return DIV_ROUND_CLOSEST(port->uartclk, 16 * baud + 2) - 2;
}
static int npcm_setup(struct uart_port *port)
{
port->get_divisor = npcm_get_divisor;
port->startup = npcm_startup;
return 0;
}
static inline struct of_serial_info *clk_nb_to_info(struct notifier_block *nb)
{
return container_of(nb, struct of_serial_info, clk_notifier);
}
static int of_platform_serial_clk_notifier_cb(struct notifier_block *nb, unsigned long event,
void *data)
{
struct of_serial_info *info = clk_nb_to_info(nb);
struct uart_8250_port *port8250 = serial8250_get_port(info->line);
struct clk_notifier_data *ndata = data;
if (event == POST_RATE_CHANGE) {
serial8250_update_uartclk(&port8250->port, ndata->new_rate);
return NOTIFY_OK;
}
return NOTIFY_DONE;
}
/*
* Fill a struct uart_port for a given device node
*/
static int of_platform_serial_setup(struct platform_device *ofdev,
int type, struct uart_8250_port *up,
struct of_serial_info *info)
{
struct resource resource;
struct device *dev = &ofdev->dev;
struct device_node *np = dev->of_node;
struct uart_port *port = &up->port;
u32 spd;
int ret;
memset(port, 0, sizeof *port);
pm_runtime_enable(&ofdev->dev);
pm_runtime_get_sync(&ofdev->dev);
ret = of_address_to_resource(np, 0, &resource);
if (ret) {
dev_err_probe(dev, ret, "invalid address\n");
goto err_pmruntime;
}
port->dev = &ofdev->dev;
port->flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_FIXED_TYPE;
spin_lock_init(&port->lock);
if (resource_type(&resource) == IORESOURCE_IO) {
port->iotype = UPIO_PORT;
port->iobase = resource.start;
} else {
port->mapbase = resource.start;
port->mapsize = resource_size(&resource);
port->flags |= UPF_IOREMAP;
}
ret = uart_read_and_validate_port_properties(port);
if (ret)
goto err_pmruntime;
/* Get clk rate through clk driver if present */
if (!port->uartclk) {
info->clk = devm_clk_get_enabled(dev, NULL);
if (IS_ERR(info->clk)) {
ret = dev_err_probe(dev, PTR_ERR(info->clk), "failed to get clock\n");
goto err_pmruntime;
}
port->uartclk = clk_get_rate(info->clk);
}
/* If current-speed was set, then try not to change it. */
if (of_property_read_u32(np, "current-speed", &spd) == 0)
port->custom_divisor = port->uartclk / (16 * spd);
/* Compatibility with the deprecated pxa driver and 8250_pxa drivers. */
if (of_device_is_compatible(np, "mrvl,mmp-uart"))
port->regshift = 2;
info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);
if (IS_ERR(info->rst)) {
ret = PTR_ERR(info->rst);
goto err_pmruntime;
}
ret = reset_control_deassert(info->rst);
if (ret)
goto err_pmruntime;
port->type = type;
port->rs485_config = serial8250_em485_config;
port->rs485_supported = serial8250_em485_supported;
up->rs485_start_tx = serial8250_em485_start_tx;
up->rs485_stop_tx = serial8250_em485_stop_tx;
switch (type) {
case PORT_RT2880:
ret = rt288x_setup(port);
break;
case PORT_NPCM:
ret = npcm_setup(port);
break;
default:
/* Nothing to do */
ret = 0;
break;
}
if (ret)
goto err_pmruntime;
if (IS_REACHABLE(CONFIG_SERIAL_8250_FSL) &&
(of_device_is_compatible(np, "fsl,ns16550") ||
of_device_is_compatible(np, "fsl,16550-FIFO64"))) {
port->handle_irq = fsl8250_handle_irq;
port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);
}
return 0;
err_pmruntime:
pm_runtime_put_sync(&ofdev->dev);
pm_runtime_disable(&ofdev->dev);
return ret;
}
/*
* Try to register a serial port
*/
static int of_platform_serial_probe(struct platform_device *ofdev)
{
struct of_serial_info *info;
struct uart_8250_port port8250;
unsigned int port_type;
u32 tx_threshold;
int ret;
if (IS_ENABLED(CONFIG_SERIAL_8250_BCM7271) &&
of_device_is_compatible(ofdev->dev.of_node, "brcm,bcm7271-uart"))
return -ENODEV;
port_type = (unsigned long)of_device_get_match_data(&ofdev->dev);
if (port_type == PORT_UNKNOWN)
return -EINVAL;
if (of_property_read_bool(ofdev->dev.of_node, "used-by-rtas"))
return -EBUSY;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (info == NULL)
return -ENOMEM;
memset(&port8250, 0, sizeof(port8250));
ret = of_platform_serial_setup(ofdev, port_type, &port8250, info);
if (ret)
goto err_free;
if (port8250.port.fifosize)
port8250.capabilities = UART_CAP_FIFO;
/* Check for TX FIFO threshold & set tx_loadsz */
if ((of_property_read_u32(ofdev->dev.of_node, "tx-threshold",
&tx_threshold) == 0) &&
(tx_threshold < port8250.port.fifosize))
port8250.tx_loadsz = port8250.port.fifosize - tx_threshold;
if (of_property_read_bool(ofdev->dev.of_node, "auto-flow-control"))
port8250.capabilities |= UART_CAP_AFE;
if (of_property_read_u32(ofdev->dev.of_node,
"overrun-throttle-ms",
&port8250.overrun_backoff_time_ms) != 0)
port8250.overrun_backoff_time_ms = 0;
ret = serial8250_register_8250_port(&port8250);
if (ret < 0)
goto err_dispose;
info->type = port_type;
info->line = ret;
platform_set_drvdata(ofdev, info);
if (info->clk) {
info->clk_notifier.notifier_call = of_platform_serial_clk_notifier_cb;
ret = clk_notifier_register(info->clk, &info->clk_notifier);
if (ret) {
dev_err_probe(port8250.port.dev, ret, "Failed to set the clock notifier\n");
goto err_unregister;
}
}
return 0;
err_unregister:
serial8250_unregister_port(info->line);
err_dispose:
pm_runtime_put_sync(&ofdev->dev);
pm_runtime_disable(&ofdev->dev);
err_free:
kfree(info);
return ret;
}
/*
* Release a line
*/
static void of_platform_serial_remove(struct platform_device *ofdev)
{
struct of_serial_info *info = platform_get_drvdata(ofdev);
if (info->clk)
clk_notifier_unregister(info->clk, &info->clk_notifier);
serial8250_unregister_port(info->line);
reset_control_assert(info->rst);
pm_runtime_put_sync(&ofdev->dev);
pm_runtime_disable(&ofdev->dev);
kfree(info);
}
#ifdef CONFIG_PM_SLEEP
static int of_serial_suspend(struct device *dev)
{
struct of_serial_info *info = dev_get_drvdata(dev);
struct uart_8250_port *port8250 = serial8250_get_port(info->line);
struct uart_port *port = &port8250->port;
serial8250_suspend_port(info->line);
if (!uart_console(port) || console_suspend_enabled) {
pm_runtime_put_sync(dev);
clk_disable_unprepare(info->clk);
}
return 0;
}
static int of_serial_resume(struct device *dev)
{
struct of_serial_info *info = dev_get_drvdata(dev);
struct uart_8250_port *port8250 = serial8250_get_port(info->line);
struct uart_port *port = &port8250->port;
if (!uart_console(port) || console_suspend_enabled) {
pm_runtime_get_sync(dev);
clk_prepare_enable(info->clk);
}
serial8250_resume_port(info->line);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(of_serial_pm_ops, of_serial_suspend, of_serial_resume);
/*
* A few common types, add more as needed.
*/
static const struct of_device_id of_platform_serial_table[] = {
{ .compatible = "ns8250", .data = (void *)PORT_8250, },
{ .compatible = "ns16450", .data = (void *)PORT_16450, },
{ .compatible = "ns16550a", .data = (void *)PORT_16550A, },
{ .compatible = "ns16550", .data = (void *)PORT_16550, },
{ .compatible = "ns16750", .data = (void *)PORT_16750, },
{ .compatible = "ns16850", .data = (void *)PORT_16850, },
{ .compatible = "nxp,lpc3220-uart", .data = (void *)PORT_LPC3220, },
{ .compatible = "ralink,rt2880-uart", .data = (void *)PORT_RT2880, },
{ .compatible = "intel,xscale-uart", .data = (void *)PORT_XSCALE, },
{ .compatible = "altr,16550-FIFO32",
.data = (void *)PORT_ALTR_16550_F32, },
{ .compatible = "altr,16550-FIFO64",
.data = (void *)PORT_ALTR_16550_F64, },
{ .compatible = "altr,16550-FIFO128",
.data = (void *)PORT_ALTR_16550_F128, },
{ .compatible = "fsl,16550-FIFO64",
.data = (void *)PORT_16550A_FSL64, },
{ .compatible = "mediatek,mtk-btif",
.data = (void *)PORT_MTK_BTIF, },
{ .compatible = "mrvl,mmp-uart",
.data = (void *)PORT_XSCALE, },
{ .compatible = "ti,da830-uart", .data = (void *)PORT_DA830, },
{ .compatible = "nuvoton,wpcm450-uart", .data = (void *)PORT_NPCM, },
{ .compatible = "nuvoton,npcm750-uart", .data = (void *)PORT_NPCM, },
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(of, of_platform_serial_table);
static struct platform_driver of_platform_serial_driver = {
.driver = {
.name = "of_serial",
.of_match_table = of_platform_serial_table,
.pm = &of_serial_pm_ops,
},
.probe = of_platform_serial_probe,
.remove_new = of_platform_serial_remove,
};
module_platform_driver(of_platform_serial_driver);
MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Serial Port driver for Open Firmware platform devices");