arch/arm/mach-shmobile/setup-rcar-gen2.c - arm/linux - Git at Google

 /*
  * R-Car Generation 2 support
  *
  * Copyright (C) 2013  Renesas Solutions Corp.
  * Copyright (C) 2013  Magnus Damm
  * Copyright (C) 2014  Ulrich Hecht
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; version 2 of the License.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/clk-provider.h>
 #include <linux/clocksource.h>
 #include <linux/device.h>
 #include <linux/dma-contiguous.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/memblock.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/of_platform.h>
 #include <asm/mach/arch.h>
 #include "common.h"
 #include "rcar-gen2.h"

 static const struct of_device_id cpg_matches[] __initconst = {
 	{ .compatible = "renesas,rcar-gen2-cpg-clocks", },
 	{ .compatible = "renesas,r8a7743-cpg-mssr", .data = "extal" },
 	{ .compatible = "renesas,r8a7790-cpg-mssr", .data = "extal" },
 	{ .compatible = "renesas,r8a7791-cpg-mssr", .data = "extal" },
 	{ .compatible = "renesas,r8a7793-cpg-mssr", .data = "extal" },
 	{ /* sentinel */ }
 };

 static unsigned int __init get_extal_freq(void)
 {
 	const struct of_device_id *match;
 	struct device_node *cpg, *extal;
 	u32 freq = 20000000;
 	int idx = 0;

 	cpg = of_find_matching_node_and_match(NULL, cpg_matches, &match);
 	if (!cpg)
 		return freq;

 	if (match->data)
 		idx = of_property_match_string(cpg, "clock-names", match->data);
 	extal = of_parse_phandle(cpg, "clocks", idx);
 	of_node_put(cpg);
 	if (!extal)
 		return freq;

 	of_property_read_u32(extal, "clock-frequency", &freq);
 	of_node_put(extal);
 	return freq;
 }

 #define CNTCR 0
 #define CNTFID0 0x20

 void __init rcar_gen2_timer_init(void)
 {
 #ifdef CONFIG_ARM_ARCH_TIMER
 	void __iomem *base;
 	u32 freq;

 	if (of_machine_is_compatible("renesas,r8a7745") ||
 	    of_machine_is_compatible("renesas,r8a7792") ||
 	    of_machine_is_compatible("renesas,r8a7794")) {
 		freq = 260000000 / 8;	/* ZS / 8 */
 		/* CNTVOFF has to be initialized either from non-secure
 		 * Hypervisor mode or secure Monitor mode with SCR.NS==1.
 		 * If TrustZone is enabled then it should be handled by the
 		 * secure code.
 		 */
 		asm volatile(
 		"	cps	0x16\n"
 		"	mrc	p15, 0, r1, c1, c1, 0\n"
 		"	orr	r0, r1, #1\n"
 		"	mcr	p15, 0, r0, c1, c1, 0\n"
 		"	isb\n"
 		"	mov	r0, #0\n"
 		"	mcrr	p15, 4, r0, r0, c14\n"
 		"	isb\n"
 		"	mcr	p15, 0, r1, c1, c1, 0\n"
 		"	isb\n"
 		"	cps	0x13\n"
 			: : : "r0", "r1");
 	} else {
 		/* At Linux boot time the r8a7790 arch timer comes up
 		 * with the counter disabled. Moreover, it may also report
 		 * a potentially incorrect fixed 13 MHz frequency. To be
 		 * correct these registers need to be updated to use the
 		 * frequency EXTAL / 2.
 		 */
 		freq = get_extal_freq() / 2;
 	}

 	/* Remap "armgcnt address map" space */
 	base = ioremap(0xe6080000, PAGE_SIZE);

 	/*
 	 * Update the timer if it is either not running, or is not at the
 	 * right frequency. The timer is only configurable in secure mode
 	 * so this avoids an abort if the loader started the timer and
 	 * entered the kernel in non-secure mode.
 	 */

 	if ((ioread32(base + CNTCR) & 1) == 0 ||
 	    ioread32(base + CNTFID0) != freq) {
 		/* Update registers with correct frequency */
 		iowrite32(freq, base + CNTFID0);
 		asm volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));

 		/* make sure arch timer is started by setting bit 0 of CNTCR */
 		iowrite32(1, base + CNTCR);
 	}

 	iounmap(base);
 #endif /* CONFIG_ARM_ARCH_TIMER */

 	of_clk_init(NULL);
 	timer_probe();
 }

 struct memory_reserve_config {
 	u64 reserved;
 	u64 base, size;
 };

 static int __init rcar_gen2_scan_mem(unsigned long node, const char *uname,
 				     int depth, void *data)
 {
 	const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 	const __be32 *reg, *endp;
 	int l;
 	struct memory_reserve_config *mrc = data;
 	u64 lpae_start = 1ULL << 32;

 	/* We are scanning "memory" nodes only */
 	if (type == NULL || strcmp(type, "memory"))
 		return 0;

 	reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
 	if (reg == NULL)
 		reg = of_get_flat_dt_prop(node, "reg", &l);
 	if (reg == NULL)
 		return 0;

 	endp = reg + (l / sizeof(__be32));
 	while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
 		u64 base, size;

 		base = dt_mem_next_cell(dt_root_addr_cells, &reg);
 		size = dt_mem_next_cell(dt_root_size_cells, &reg);

 		if (base >= lpae_start)
 			continue;

 		if ((base + size) >= lpae_start)
 			size = lpae_start - base;

 		if (size < mrc->reserved)
 			continue;

 		if (base < mrc->base)
 			continue;

 		/* keep the area at top near the 32-bit legacy limit */
 		mrc->base = base + size - mrc->reserved;
 		mrc->size = mrc->reserved;
 	}

 	return 0;
 }

 void __init rcar_gen2_reserve(void)
 {
 	struct memory_reserve_config mrc;

 	/* reserve 256 MiB at the top of the physical legacy 32-bit space */
 	memset(&mrc, 0, sizeof(mrc));
 	mrc.reserved = SZ_256M;

 	of_scan_flat_dt(rcar_gen2_scan_mem, &mrc);
 #ifdef CONFIG_DMA_CMA
 	if (mrc.size && memblock_is_region_memory(mrc.base, mrc.size)) {
 		static struct cma *rcar_gen2_dma_contiguous;

 		dma_contiguous_reserve_area(mrc.size, mrc.base, 0,
 					    &rcar_gen2_dma_contiguous, true);
 	}
 #endif
 }

 static const char * const rcar_gen2_boards_compat_dt[] __initconst = {
 	/*
 	 * R8A7790 and R8A7791 can't be handled here as long as they need SMP
 	 * initialization fallback.
 	 */
 	"renesas,r8a7792",
 	"renesas,r8a7793",
 	"renesas,r8a7794",
 	NULL,
 };

 DT_MACHINE_START(RCAR_GEN2_DT, "Generic R-Car Gen2 (Flattened Device Tree)")
 	.init_early	= shmobile_init_delay,
 	.init_late	= shmobile_init_late,
 	.init_time	= rcar_gen2_timer_init,
 	.reserve	= rcar_gen2_reserve,
 	.dt_compat	= rcar_gen2_boards_compat_dt,
 MACHINE_END

 static const char * const rz_g1_boards_compat_dt[] __initconst = {
 	"renesas,r8a7743",
 	"renesas,r8a7745",
 	NULL,
 };

 DT_MACHINE_START(RZ_G1_DT, "Generic RZ/G1 (Flattened Device Tree)")
 	.init_early	= shmobile_init_delay,
 	.init_late	= shmobile_init_late,
 	.init_time	= rcar_gen2_timer_init,
 	.reserve	= rcar_gen2_reserve,
 	.dt_compat	= rz_g1_boards_compat_dt,
 MACHINE_END
	/*
	* R-Car Generation 2 support
	*
	* Copyright (C) 2013 Renesas Solutions Corp.
	* Copyright (C) 2013 Magnus Damm
	* Copyright (C) 2014 Ulrich Hecht
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; version 2 of the License.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/clk-provider.h>
	#include <linux/clocksource.h>
	#include <linux/device.h>
	#include <linux/dma-contiguous.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/memblock.h>
	#include <linux/of.h>
	#include <linux/of_fdt.h>
	#include <linux/of_platform.h>
	#include <asm/mach/arch.h>
	#include "common.h"
	#include "rcar-gen2.h"

	static const struct of_device_id cpg_matches[] __initconst = {
	{ .compatible = "renesas,rcar-gen2-cpg-clocks", },
	{ .compatible = "renesas,r8a7743-cpg-mssr", .data = "extal" },
	{ .compatible = "renesas,r8a7790-cpg-mssr", .data = "extal" },
	{ .compatible = "renesas,r8a7791-cpg-mssr", .data = "extal" },
	{ .compatible = "renesas,r8a7793-cpg-mssr", .data = "extal" },
	{ /* sentinel */ }
	};

	static unsigned int __init get_extal_freq(void)
	{
	const struct of_device_id *match;
	struct device_node cpg, extal;
	u32 freq = 20000000;
	int idx = 0;

	cpg = of_find_matching_node_and_match(NULL, cpg_matches, &match);
	if (!cpg)
	return freq;

	if (match->data)
	idx = of_property_match_string(cpg, "clock-names", match->data);
	extal = of_parse_phandle(cpg, "clocks", idx);
	of_node_put(cpg);
	if (!extal)
	return freq;

	of_property_read_u32(extal, "clock-frequency", &freq);
	of_node_put(extal);
	return freq;
	}

	#define CNTCR 0
	#define CNTFID0 0x20

	void __init rcar_gen2_timer_init(void)
	{
	#ifdef CONFIG_ARM_ARCH_TIMER
	void __iomem *base;
	u32 freq;

	if (of_machine_is_compatible("renesas,r8a7745") \|\|
	of_machine_is_compatible("renesas,r8a7792") \|\|
	of_machine_is_compatible("renesas,r8a7794")) {
	freq = 260000000 / 8; /* ZS / 8 */
	/* CNTVOFF has to be initialized either from non-secure
	* Hypervisor mode or secure Monitor mode with SCR.NS==1.
	* If TrustZone is enabled then it should be handled by the
	* secure code.
	*/
	asm volatile(
	" cps 0x16\n"
	" mrc p15, 0, r1, c1, c1, 0\n"
	" orr r0, r1, #1\n"
	" mcr p15, 0, r0, c1, c1, 0\n"
	" isb\n"
	" mov r0, #0\n"
	" mcrr p15, 4, r0, r0, c14\n"
	" isb\n"
	" mcr p15, 0, r1, c1, c1, 0\n"
	" isb\n"
	" cps 0x13\n"
	: : : "r0", "r1");
	} else {
	/* At Linux boot time the r8a7790 arch timer comes up
	* with the counter disabled. Moreover, it may also report
	* a potentially incorrect fixed 13 MHz frequency. To be
	* correct these registers need to be updated to use the
	* frequency EXTAL / 2.
	*/
	freq = get_extal_freq() / 2;
	}

	/* Remap "armgcnt address map" space */
	base = ioremap(0xe6080000, PAGE_SIZE);

	/*
	* Update the timer if it is either not running, or is not at the
	* right frequency. The timer is only configurable in secure mode
	* so this avoids an abort if the loader started the timer and
	* entered the kernel in non-secure mode.
	*/

	if ((ioread32(base + CNTCR) & 1) == 0 \|\|
	ioread32(base + CNTFID0) != freq) {
	/* Update registers with correct frequency */
	iowrite32(freq, base + CNTFID0);
	asm volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));

	/* make sure arch timer is started by setting bit 0 of CNTCR */
	iowrite32(1, base + CNTCR);
	}

	iounmap(base);
	#endif /* CONFIG_ARM_ARCH_TIMER */

	of_clk_init(NULL);
	timer_probe();
	}

	struct memory_reserve_config {
	u64 reserved;
	u64 base, size;
	};

	static int __init rcar_gen2_scan_mem(unsigned long node, const char *uname,
	int depth, void *data)
	{
	const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
	const __be32 reg, endp;
	int l;
	struct memory_reserve_config *mrc = data;
	u64 lpae_start = 1ULL << 32;

	/* We are scanning "memory" nodes only */
	if (type == NULL \|\| strcmp(type, "memory"))
	return 0;

	reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
	if (reg == NULL)
	reg = of_get_flat_dt_prop(node, "reg", &l);
	if (reg == NULL)
	return 0;

	endp = reg + (l / sizeof(__be32));
	while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
	u64 base, size;

	base = dt_mem_next_cell(dt_root_addr_cells, &reg);
	size = dt_mem_next_cell(dt_root_size_cells, &reg);

	if (base >= lpae_start)
	continue;

	if ((base + size) >= lpae_start)
	size = lpae_start - base;

	if (size < mrc->reserved)
	continue;

	if (base < mrc->base)
	continue;

	/* keep the area at top near the 32-bit legacy limit */
	mrc->base = base + size - mrc->reserved;
	mrc->size = mrc->reserved;
	}

	return 0;
	}

	void __init rcar_gen2_reserve(void)
	{
	struct memory_reserve_config mrc;

	/* reserve 256 MiB at the top of the physical legacy 32-bit space */
	memset(&mrc, 0, sizeof(mrc));
	mrc.reserved = SZ_256M;

	of_scan_flat_dt(rcar_gen2_scan_mem, &mrc);
	#ifdef CONFIG_DMA_CMA
	if (mrc.size && memblock_is_region_memory(mrc.base, mrc.size)) {
	static struct cma *rcar_gen2_dma_contiguous;

	dma_contiguous_reserve_area(mrc.size, mrc.base, 0,
	&rcar_gen2_dma_contiguous, true);
	}
	#endif
	}

	static const char * const rcar_gen2_boards_compat_dt[] __initconst = {
	/*
	* R8A7790 and R8A7791 can't be handled here as long as they need SMP
	* initialization fallback.
	*/
	"renesas,r8a7792",
	"renesas,r8a7793",
	"renesas,r8a7794",
	NULL,
	};

	DT_MACHINE_START(RCAR_GEN2_DT, "Generic R-Car Gen2 (Flattened Device Tree)")
	.init_early = shmobile_init_delay,
	.init_late = shmobile_init_late,
	.init_time = rcar_gen2_timer_init,
	.reserve = rcar_gen2_reserve,
	.dt_compat = rcar_gen2_boards_compat_dt,
	MACHINE_END

	static const char * const rz_g1_boards_compat_dt[] __initconst = {
	"renesas,r8a7743",
	"renesas,r8a7745",
	NULL,
	};

	DT_MACHINE_START(RZ_G1_DT, "Generic RZ/G1 (Flattened Device Tree)")
	.init_early = shmobile_init_delay,
	.init_late = shmobile_init_late,
	.init_time = rcar_gen2_timer_init,
	.reserve = rcar_gen2_reserve,
	.dt_compat = rz_g1_boards_compat_dt,
	MACHINE_END