![Vineet Gupta](/assets/img/avatar_default.png)
Earlier CONFIG_SERIAL_ARC_CONSOLE would unconditionally enable the legacy ARC UART based early console even if platform lacked that UART (e.g. nSIM OSCI platform). So a multi-platform image containing the 2 UART drivers won't work. Fix that by probing the driver only if "earlyprintk=ttyARC0" is present in cmdline. Reported-by: Chuck Jordan <cjordan@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
185 lines
4.6 KiB
C
185 lines
4.6 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/io.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/clk.h>
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#include <asm/mach_desc.h>
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#include <plat/memmap.h>
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#include <plat/smp.h>
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#include <plat/irq.h>
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/*----------------------- Platform Devices -----------------------------*/
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#if IS_ENABLED(CONFIG_SERIAL_ARC)
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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 /* CONFIG_SERIAL_ARC_CONSOLE */
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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 (build time) as an early platform driver
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* of class "earlyprintk". However it needs explicit cmdline toggle
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* "earlyprintk=ttyARC0" to be successfuly runtime registered.
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* Otherwise the early probe below fails to find the driver
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*/
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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 /* CONFIG_SERIAL_ARC_CONSOLE */
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}
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#else /* !IS_ENABLED(CONFIG_SERIAL_ARC) */
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static void arc_fpga_serial_init(void)
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{
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}
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#endif
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static void __init plat_fpga_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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#ifdef CONFIG_ISS_SMP_EXTN
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iss_model_init_early_smp();
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#endif
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}
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static struct of_dev_auxdata plat_auxdata_lookup[] __initdata = {
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#if IS_ENABLED(CONFIG_SERIAL_ARC)
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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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static void __init plat_fpga_populate_dev(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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}
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/*----------------------- Machine Descriptions ------------------------------
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*
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* Machine description is simply a set of platform/board specific callbacks
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* This is not directly related to DeviceTree based dynamic device creation,
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* however as part of early device tree scan, we also select the right
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* callback set, by matching the DT compatible name.
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*/
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static const char *aa4_compat[] __initconst = {
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"snps,arc-angel4",
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NULL,
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};
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MACHINE_START(ANGEL4, "angel4")
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.dt_compat = aa4_compat,
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.init_early = plat_fpga_early_init,
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.init_machine = plat_fpga_populate_dev,
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.init_irq = plat_fpga_init_IRQ,
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#ifdef CONFIG_ISS_SMP_EXTN
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.init_smp = iss_model_init_smp,
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#endif
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MACHINE_END
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static const char *ml509_compat[] __initconst = {
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"snps,arc-ml509",
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NULL,
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};
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MACHINE_START(ML509, "ml509")
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.dt_compat = ml509_compat,
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.init_early = plat_fpga_early_init,
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.init_machine = plat_fpga_populate_dev,
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.init_irq = plat_fpga_init_IRQ,
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#ifdef CONFIG_SMP
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.init_smp = iss_model_init_smp,
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#endif
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MACHINE_END
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static const char *nsimosci_compat[] __initconst = {
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"snps,nsimosci",
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NULL,
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};
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MACHINE_START(NSIMOSCI, "nsimosci")
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.dt_compat = nsimosci_compat,
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.init_early = NULL,
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.init_machine = plat_fpga_populate_dev,
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.init_irq = NULL,
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MACHINE_END
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