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/*
* ARC FPGA Platform support code
*
* Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/types.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/console.h>
#include <linux/of_platform.h>
#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/clk.h>
#include <plat/memmap.h>
/*----------------------- Platform Devices -----------------------------*/
static unsigned long arc_uart_info[] = {
0, /* uart->is_emulated (runtime @running_on_hw) */
0, /* uart->port.uartclk */
0, /* uart->baud */
0
};
#if defined(CONFIG_SERIAL_ARC_CONSOLE)
/*
* static platform data - but only for early serial
* TBD: derive this from a special DT node
*/
static struct resource arc_uart0_res[] = {
{
.start = UART0_BASE,
.end = UART0_BASE + 0xFF,
.flags = IORESOURCE_MEM,
},
{
.start = UART0_IRQ,
.end = UART0_IRQ,
.flags = IORESOURCE_IRQ,
},
};
static struct platform_device arc_uart0_dev = {
.name = "arc-uart",
.id = 0,
.num_resources = ARRAY_SIZE(arc_uart0_res),
.resource = arc_uart0_res,
.dev = {
.platform_data = &arc_uart_info,
},
};
static struct platform_device *fpga_early_devs[] __initdata = {
&arc_uart0_dev,
};
#endif
static void arc_fpga_serial_init(void)
{
/* To let driver workaround ISS bug: baudh Reg can't be set to 0 */
arc_uart_info[0] = !running_on_hw;
arc_uart_info[1] = arc_get_core_freq();
arc_uart_info[2] = CONFIG_ARC_SERIAL_BAUD;
#if defined(CONFIG_SERIAL_ARC_CONSOLE)
early_platform_add_devices(fpga_early_devs,
ARRAY_SIZE(fpga_early_devs));
/*
* ARC console driver registers itself as an early platform driver
* of class "earlyprintk".
* Install it here, followed by probe of devices.
* The installation here doesn't require earlyprintk in command line
* To do so however, replace the lines below with
* parse_early_param();
* early_platform_driver_probe("earlyprintk", 1, 1);
* ^^
*/
early_platform_driver_register_all("earlyprintk");
early_platform_driver_probe("earlyprintk", 1, 0);
/*
* This is to make sure that arc uart would be preferred console
* despite one/more of following:
* -command line lacked "console=ttyARC0" or
* -CONFIG_VT_CONSOLE was enabled (for no reason whatsoever)
* Note that this needs to be done after above early console is reg,
* otherwise the early console never gets a chance to run.
*/
add_preferred_console("ttyARC", 0, "115200");
#endif
}
/*
* Early Platform Initialization called from setup_arch()
*/
void __init arc_platform_early_init(void)
{
pr_info("[plat-arcfpga]: registering early dev resources\n");
arc_fpga_serial_init();
}
static struct of_dev_auxdata plat_auxdata_lookup[] __initdata = {
#if defined(CONFIG_SERIAL_ARC) || defined(CONFIG_SERIAL_ARC_MODULE)
OF_DEV_AUXDATA("snps,arc-uart", UART0_BASE, "arc-uart", arc_uart_info),
#endif
{}
};
int __init fpga_plat_init(void)
{
pr_info("[plat-arcfpga]: registering device resources\n");
/*
* Traverses flattened DeviceTree - registering platform devices
* complete with their resources
*/
of_platform_populate(NULL, of_default_bus_match_table,
plat_auxdata_lookup, NULL);
return 0;
}
arch_initcall(fpga_plat_init);
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