diff options
Diffstat (limited to 'arch/arc/plat-arcfpga/platform.c')
| -rw-r--r-- | arch/arc/plat-arcfpga/platform.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/arch/arc/plat-arcfpga/platform.c b/arch/arc/plat-arcfpga/platform.c new file mode 100644 index 00000000000..61c7e599738 --- /dev/null +++ b/arch/arc/plat-arcfpga/platform.c @@ -0,0 +1,184 @@ +/* + * 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/io.h> +#include <linux/console.h> +#include <linux/of_platform.h> +#include <asm/setup.h> +#include <asm/clk.h> +#include <asm/mach_desc.h> +#include <plat/memmap.h> +#include <plat/smp.h> +#include <plat/irq.h> + +/*----------------------- Platform Devices -----------------------------*/ + +#if IS_ENABLED(CONFIG_SERIAL_ARC) +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 /* CONFIG_SERIAL_ARC_CONSOLE */ + +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 (build time) as an early platform driver + * of class "earlyprintk". However it needs explicit cmdline toggle + * "earlyprintk=ttyARC0" to be successfuly runtime registered. + * Otherwise the early probe below fails to find the driver + */ + 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 /* CONFIG_SERIAL_ARC_CONSOLE */ +} +#else /* !IS_ENABLED(CONFIG_SERIAL_ARC) */ +static void arc_fpga_serial_init(void) +{ +} +#endif + +static void __init plat_fpga_early_init(void) +{ + pr_info("[plat-arcfpga]: registering early dev resources\n"); + + arc_fpga_serial_init(); + +#ifdef CONFIG_ISS_SMP_EXTN + iss_model_init_early_smp(); +#endif +} + +static struct of_dev_auxdata plat_auxdata_lookup[] __initdata = { +#if IS_ENABLED(CONFIG_SERIAL_ARC) + OF_DEV_AUXDATA("snps,arc-uart", UART0_BASE, "arc-uart", arc_uart_info), +#endif + {} +}; + +static void __init plat_fpga_populate_dev(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); +} + +/*----------------------- Machine Descriptions ------------------------------ + * + * Machine description is simply a set of platform/board specific callbacks + * This is not directly related to DeviceTree based dynamic device creation, + * however as part of early device tree scan, we also select the right + * callback set, by matching the DT compatible name. + */ + +static const char *aa4_compat[] __initconst = { + "snps,arc-angel4", + NULL, +}; + +MACHINE_START(ANGEL4, "angel4") + .dt_compat = aa4_compat, + .init_early = plat_fpga_early_init, + .init_machine = plat_fpga_populate_dev, + .init_irq = plat_fpga_init_IRQ, +#ifdef CONFIG_ISS_SMP_EXTN + .init_smp = iss_model_init_smp, +#endif +MACHINE_END + +static const char *ml509_compat[] __initconst = { + "snps,arc-ml509", + NULL, +}; + +MACHINE_START(ML509, "ml509") + .dt_compat = ml509_compat, + .init_early = plat_fpga_early_init, + .init_machine = plat_fpga_populate_dev, + .init_irq = plat_fpga_init_IRQ, +#ifdef CONFIG_SMP + .init_smp = iss_model_init_smp, +#endif +MACHINE_END + +static const char *nsimosci_compat[] __initconst = { + "snps,nsimosci", + NULL, +}; + +MACHINE_START(NSIMOSCI, "nsimosci") + .dt_compat = nsimosci_compat, + .init_early = NULL, + .init_machine = plat_fpga_populate_dev, + .init_irq = NULL, +MACHINE_END |