forked from luck/tmp_suning_uos_patched
abe11ddea1
* arc-uart platform device now populated dynamically, using
of_platform_populate() - applies to any other device whatsoever.
* uart in turn requires incore arc-intc to be also present in DT
* A irq-domain needs to be instantiated for IRQ requests by DT probed
device (e.g. arc-uart)
TODO: switch over to linear irq domain once all devs have been
transitioned to DT
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Arnd Bergmann <arnd@arndb.de>
133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/*
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* ARC FPGA Platform support code
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*
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* Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/console.h>
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#include <linux/of_platform.h>
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#include <asm/setup.h>
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#include <asm/irq.h>
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#include <asm/clk.h>
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#include <plat/memmap.h>
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/*----------------------- Platform Devices -----------------------------*/
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static unsigned long arc_uart_info[] = {
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0, /* uart->is_emulated (runtime @running_on_hw) */
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0, /* uart->port.uartclk */
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0, /* uart->baud */
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0
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};
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#if defined(CONFIG_SERIAL_ARC_CONSOLE)
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/*
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* static platform data - but only for early serial
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* TBD: derive this from a special DT node
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*/
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static struct resource arc_uart0_res[] = {
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{
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.start = UART0_BASE,
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.end = UART0_BASE + 0xFF,
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.flags = IORESOURCE_MEM,
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},
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{
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.start = UART0_IRQ,
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.end = UART0_IRQ,
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.flags = IORESOURCE_IRQ,
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},
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};
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static struct platform_device arc_uart0_dev = {
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.name = "arc-uart",
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.id = 0,
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.num_resources = ARRAY_SIZE(arc_uart0_res),
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.resource = arc_uart0_res,
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.dev = {
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.platform_data = &arc_uart_info,
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},
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};
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static struct platform_device *fpga_early_devs[] __initdata = {
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&arc_uart0_dev,
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};
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#endif
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static void arc_fpga_serial_init(void)
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{
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/* To let driver workaround ISS bug: baudh Reg can't be set to 0 */
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arc_uart_info[0] = !running_on_hw;
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arc_uart_info[1] = arc_get_core_freq();
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arc_uart_info[2] = CONFIG_ARC_SERIAL_BAUD;
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#if defined(CONFIG_SERIAL_ARC_CONSOLE)
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early_platform_add_devices(fpga_early_devs,
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ARRAY_SIZE(fpga_early_devs));
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/*
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* ARC console driver registers itself as an early platform driver
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* of class "earlyprintk".
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* Install it here, followed by probe of devices.
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* The installation here doesn't require earlyprintk in command line
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* To do so however, replace the lines below with
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* parse_early_param();
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* early_platform_driver_probe("earlyprintk", 1, 1);
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* ^^
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*/
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early_platform_driver_register_all("earlyprintk");
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early_platform_driver_probe("earlyprintk", 1, 0);
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/*
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* This is to make sure that arc uart would be preferred console
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* despite one/more of following:
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* -command line lacked "console=ttyARC0" or
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* -CONFIG_VT_CONSOLE was enabled (for no reason whatsoever)
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* Note that this needs to be done after above early console is reg,
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* otherwise the early console never gets a chance to run.
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*/
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add_preferred_console("ttyARC", 0, "115200");
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#endif
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}
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/*
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* Early Platform Initialization called from setup_arch()
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*/
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void __init arc_platform_early_init(void)
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{
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pr_info("[plat-arcfpga]: registering early dev resources\n");
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arc_fpga_serial_init();
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}
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static struct of_dev_auxdata plat_auxdata_lookup[] __initdata = {
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#if defined(CONFIG_SERIAL_ARC) || defined(CONFIG_SERIAL_ARC_MODULE)
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OF_DEV_AUXDATA("snps,arc-uart", UART0_BASE, "arc-uart", arc_uart_info),
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#endif
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{}
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};
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int __init fpga_plat_init(void)
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{
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pr_info("[plat-arcfpga]: registering device resources\n");
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/*
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* Traverses flattened DeviceTree - registering platform devices
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* complete with their resources
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*/
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of_platform_populate(NULL, of_default_bus_match_table,
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plat_auxdata_lookup, NULL);
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return 0;
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}
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arch_initcall(fpga_plat_init);
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