arch/arc/plat-arcfpga/platform.c - linux - Git at Google

 /*
  * 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>

 /*-----------------------BVCI Latency Unit -----------------------------*/

 #ifdef CONFIG_ARC_HAS_BVCI_LAT_UNIT

 int lat_cycles = CONFIG_BVCI_LAT_CYCLES;

 /* BVCI Bus Profiler: Latency Unit */
 static void __init setup_bvci_lat_unit(void)
 {
 #define MAX_BVCI_UNITS 12

 	unsigned int i;
 	unsigned int *base = (unsigned int *)BVCI_LAT_UNIT_BASE;
 	const unsigned long units_req = CONFIG_BVCI_LAT_UNITS;
 	const unsigned int REG_UNIT = 21;
 	const unsigned int REG_VAL = 22;

 	/*
 	 * There are multiple Latency Units corresponding to the many
 	 * interfaces of the system bus arbiter (both CPU side as well as
 	 * the peripheral side).
 	 *
 	 * Unit  0 - System Arb and Mem Controller - adds latency to all
 	 *	    memory trasactions
 	 * Unit  1 - I$ and System Bus
 	 * Unit  2 - D$ and System Bus
 	 * ..
 	 * Unit 12 - IDE Disk controller and System Bus
 	 *
 	 * The programmers model requires writing to lat_unit reg first
 	 * and then the latency value (cycles) to lat_value reg
 	 */

 	if (CONFIG_BVCI_LAT_UNITS == 0) {
 		writel(0, base + REG_UNIT);
 		writel(lat_cycles, base + REG_VAL);
 		pr_info("BVCI Latency for all Memory Transactions %d cycles\n",
 			lat_cycles);
 	} else {
 		for_each_set_bit(i, &units_req, MAX_BVCI_UNITS) {
 			writel(i + 1, base + REG_UNIT); /* loop is 0 based */
 			writel(lat_cycles, base + REG_VAL);
 			pr_info("BVCI Latency for Unit[%d] = %d cycles\n",
 				(i + 1), lat_cycles);
 		}
 	}
 }
 #else
 static void __init setup_bvci_lat_unit(void)
 {
 }
 #endif

 /*----------------------- 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 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	/* 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");

 	setup_bvci_lat_unit();

 	arc_fpga_serial_init();

 #ifdef CONFIG_SMP
 	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[] __initdata = {
 	"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_SMP
 	.init_smp	= iss_model_init_smp,
 #endif
 MACHINE_END

 static const char *ml509_compat[] __initdata = {
 	"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[] __initdata = {
 	"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
	/*
	* 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>

	/-----------------------BVCI Latency Unit -----------------------------/

	#ifdef CONFIG_ARC_HAS_BVCI_LAT_UNIT

	int lat_cycles = CONFIG_BVCI_LAT_CYCLES;

	/* BVCI Bus Profiler: Latency Unit */
	static void __init setup_bvci_lat_unit(void)
	{
	#define MAX_BVCI_UNITS 12

	unsigned int i;
	unsigned int base = (unsigned int )BVCI_LAT_UNIT_BASE;
	const unsigned long units_req = CONFIG_BVCI_LAT_UNITS;
	const unsigned int REG_UNIT = 21;
	const unsigned int REG_VAL = 22;

	/*
	* There are multiple Latency Units corresponding to the many
	* interfaces of the system bus arbiter (both CPU side as well as
	* the peripheral side).
	*
	* Unit 0 - System Arb and Mem Controller - adds latency to all
	* memory trasactions
	* Unit 1 - I$ and System Bus
	* Unit 2 - D$ and System Bus
	* ..
	* Unit 12 - IDE Disk controller and System Bus
	*
	* The programmers model requires writing to lat_unit reg first
	* and then the latency value (cycles) to lat_value reg
	*/

	if (CONFIG_BVCI_LAT_UNITS == 0) {
	writel(0, base + REG_UNIT);
	writel(lat_cycles, base + REG_VAL);
	pr_info("BVCI Latency for all Memory Transactions %d cycles\n",
	lat_cycles);
	} else {
	for_each_set_bit(i, &units_req, MAX_BVCI_UNITS) {
	writel(i + 1, base + REG_UNIT); /* loop is 0 based */
	writel(lat_cycles, base + REG_VAL);
	pr_info("BVCI Latency for Unit[%d] = %d cycles\n",
	(i + 1), lat_cycles);
	}
	}
	}
	#else
	static void __init setup_bvci_lat_unit(void)
	{
	}
	#endif

	/----------------------- 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 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 /* 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");

	setup_bvci_lat_unit();

	arc_fpga_serial_init();

	#ifdef CONFIG_SMP
	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[] __initdata = {
	"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_SMP
	.init_smp = iss_model_init_smp,
	#endif
	MACHINE_END

	static const char *ml509_compat[] __initdata = {
	"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[] __initdata = {
	"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