[linux-2.6-block.git] / drivers / firmware / trusted_foundations.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Trusted Foundations support for ARM CPUs
 *
 * Copyright (c) 2013, NVIDIA Corporation.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of.h>

#include <linux/firmware/trusted_foundations.h>

#include <asm/firmware.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/outercache.h>

#define TF_CACHE_MAINT		0xfffff100

#define TF_CACHE_ENABLE		1
#define TF_CACHE_DISABLE	2

#define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200

#define TF_CPU_PM		0xfffffffc
#define TF_CPU_PM_S3		0xffffffe3
#define TF_CPU_PM_S2		0xffffffe6
#define TF_CPU_PM_S2_NO_MC_CLK	0xffffffe5
#define TF_CPU_PM_S1		0xffffffe4
#define TF_CPU_PM_S1_NOFLUSH_L2	0xffffffe7

static unsigned long cpu_boot_addr;

static void tf_generic_smc(u32 type, u32 arg1, u32 arg2)
{
	register u32 r0 asm("r0") = type;
	register u32 r1 asm("r1") = arg1;
	register u32 r2 asm("r2") = arg2;

	asm volatile(
		".arch_extension	sec\n\t"
		"stmfd	sp!, {r4 - r11}\n\t"
		__asmeq("%0", "r0")
		__asmeq("%1", "r1")
		__asmeq("%2", "r2")
		"mov	r3, #0\n\t"
		"mov	r4, #0\n\t"
		"smc	#0\n\t"
		"ldmfd	sp!, {r4 - r11}\n\t"
		:
		: "r" (r0), "r" (r1), "r" (r2)
		: "memory", "r3", "r12", "lr");
}

static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
{
	cpu_boot_addr = boot_addr;
	tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, cpu_boot_addr, 0);

	return 0;
}

static int tf_prepare_idle(unsigned long mode)
{
	switch (mode) {
	case TF_PM_MODE_LP0:
		tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S3, cpu_boot_addr);
		break;

	case TF_PM_MODE_LP1:
		tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S2, cpu_boot_addr);
		break;

	case TF_PM_MODE_LP1_NO_MC_CLK:
		tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S2_NO_MC_CLK,
			       cpu_boot_addr);
		break;

	case TF_PM_MODE_LP2:
		tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S1, cpu_boot_addr);
		break;

	case TF_PM_MODE_LP2_NOFLUSH_L2:
		tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S1_NOFLUSH_L2,
			       cpu_boot_addr);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

#ifdef CONFIG_CACHE_L2X0
static void tf_cache_write_sec(unsigned long val, unsigned int reg)
{
	u32 l2x0_way_mask = 0xff;

	switch (reg) {
	case L2X0_CTRL:
		if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_ASSOCIATIVITY_16)
			l2x0_way_mask = 0xffff;

		if (val == L2X0_CTRL_EN)
			tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_ENABLE,
				       l2x0_saved_regs.aux_ctrl);
		else
			tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_DISABLE,
				       l2x0_way_mask);
		break;

	default:
		break;
	}
}

static int tf_init_cache(void)
{
	outer_cache.write_sec = tf_cache_write_sec;

	return 0;
}
#endif /* CONFIG_CACHE_L2X0 */

static const struct firmware_ops trusted_foundations_ops = {
	.set_cpu_boot_addr = tf_set_cpu_boot_addr,
	.prepare_idle = tf_prepare_idle,
#ifdef CONFIG_CACHE_L2X0
	.l2x0_init = tf_init_cache,
#endif
};

void register_trusted_foundations(struct trusted_foundations_platform_data *pd)
{
	/*
	 * we are not using version information for now since currently
	 * supported SMCs are compatible with all TF releases
	 */
	register_firmware_ops(&trusted_foundations_ops);
}

void of_register_trusted_foundations(void)
{
	struct device_node *node;
	struct trusted_foundations_platform_data pdata;
	int err;

	node = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations");
	if (!node)
		return;

	err = of_property_read_u32(node, "tlm,version-major",
				   &pdata.version_major);
	if (err != 0)
		panic("Trusted Foundation: missing version-major property\n");
	err = of_property_read_u32(node, "tlm,version-minor",
				   &pdata.version_minor);
	if (err != 0)
		panic("Trusted Foundation: missing version-minor property\n");
	register_trusted_foundations(&pdata);
}

bool trusted_foundations_registered(void)
{
	return firmware_ops == &trusted_foundations_ops;
}
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
d9a1beaa AC	2	/*
	3	* Trusted Foundations support for ARM CPUs
	4	*
	5	* Copyright (c) 2013, NVIDIA Corporation.
d9a1beaa AC	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/init.h>
	10	#include <linux/of.h>
4cb5d9ec TR	11
	12	#include <linux/firmware/trusted_foundations.h>
	13
d9a1beaa	14	#include <asm/firmware.h>
ebca2a6e DO	15	#include <asm/hardware/cache-l2x0.h>
ebca2a6e DO	16	#include <asm/outercache.h>
d9a1beaa	17
ebca2a6e DO	18	#define TF_CACHE_MAINT 0xfffff100
	19
	20	#define TF_CACHE_ENABLE 1
	21	#define TF_CACHE_DISABLE 2
	22
d9a1beaa AC	23	#define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200
d9a1beaa AC	24
b77b6e88 AC	25	#define TF_CPU_PM 0xfffffffc
	26	#define TF_CPU_PM_S3 0xffffffe3
	27	#define TF_CPU_PM_S2 0xffffffe6
	28	#define TF_CPU_PM_S2_NO_MC_CLK 0xffffffe5
	29	#define TF_CPU_PM_S1 0xffffffe4
	30	#define TF_CPU_PM_S1_NOFLUSH_L2 0xffffffe7
	31
	32	static unsigned long cpu_boot_addr;
	33
4ea7bdc6	34	static void tf_generic_smc(u32 type, u32 arg1, u32 arg2)
d9a1beaa	35	{
4ea7bdc6 SA	36	register u32 r0 asm("r0") = type;
	37	register u32 r1 asm("r1") = arg1;
	38	register u32 r2 asm("r2") = arg2;
	39
d9a1beaa AC	40	asm volatile(
d9a1beaa AC	41	".arch_extension sec\n\t"
4ea7bdc6	42	"stmfd sp!, {r4 - r11}\n\t"
d9a1beaa AC	43	__asmeq("%0", "r0")
	44	__asmeq("%1", "r1")
	45	__asmeq("%2", "r2")
	46	"mov r3, #0\n\t"
	47	"mov r4, #0\n\t"
	48	"smc #0\n\t"
4ea7bdc6	49	"ldmfd sp!, {r4 - r11}\n\t"
d9a1beaa	50	:
4ea7bdc6 SA	51	: "r" (r0), "r" (r1), "r" (r2)
4ea7bdc6 SA	52	: "memory", "r3", "r12", "lr");
d9a1beaa AC	53	}
	54
	55	static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
	56	{
b77b6e88 AC	57	cpu_boot_addr = boot_addr;
	58	tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, cpu_boot_addr, 0);
	59
	60	return 0;
	61	}
	62
96446e21	63	static int tf_prepare_idle(unsigned long mode)
b77b6e88	64	{
96446e21 DO	65	switch (mode) {
	66	case TF_PM_MODE_LP0:
	67	tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S3, cpu_boot_addr);
	68	break;
	69
	70	case TF_PM_MODE_LP1:
	71	tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S2, cpu_boot_addr);
	72	break;
	73
	74	case TF_PM_MODE_LP1_NO_MC_CLK:
	75	tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S2_NO_MC_CLK,
	76	cpu_boot_addr);
	77	break;
	78
	79	case TF_PM_MODE_LP2:
	80	tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S1, cpu_boot_addr);
	81	break;
	82
	83	case TF_PM_MODE_LP2_NOFLUSH_L2:
	84	tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S1_NOFLUSH_L2,
	85	cpu_boot_addr);
	86	break;
	87
	88	default:
	89	return -EINVAL;
	90	}
d9a1beaa AC	91
	92	return 0;
	93	}
	94
ebca2a6e DO	95	#ifdef CONFIG_CACHE_L2X0
	96	static void tf_cache_write_sec(unsigned long val, unsigned int reg)
	97	{
	98	u32 l2x0_way_mask = 0xff;
	99
	100	switch (reg) {
	101	case L2X0_CTRL:
	102	if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_ASSOCIATIVITY_16)
	103	l2x0_way_mask = 0xffff;
	104
	105	if (val == L2X0_CTRL_EN)
	106	tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_ENABLE,
	107	l2x0_saved_regs.aux_ctrl);
	108	else
	109	tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_DISABLE,
	110	l2x0_way_mask);
	111	break;
	112
	113	default:
	114	break;
	115	}
	116	}
	117
	118	static int tf_init_cache(void)
	119	{
	120	outer_cache.write_sec = tf_cache_write_sec;
	121
	122	return 0;
	123	}
	124	#endif /* CONFIG_CACHE_L2X0 */
	125
d9a1beaa AC	126	static const struct firmware_ops trusted_foundations_ops = {
d9a1beaa AC	127	.set_cpu_boot_addr = tf_set_cpu_boot_addr,
b77b6e88	128	.prepare_idle = tf_prepare_idle,
ebca2a6e DO	129	#ifdef CONFIG_CACHE_L2X0
	130	.l2x0_init = tf_init_cache,
	131	#endif
d9a1beaa AC	132	};
	133
	134	void register_trusted_foundations(struct trusted_foundations_platform_data *pd)
	135	{
	136	/*
	137	* we are not using version information for now since currently
	138	* supported SMCs are compatible with all TF releases
	139	*/
	140	register_firmware_ops(&trusted_foundations_ops);
	141	}
	142
	143	void of_register_trusted_foundations(void)
	144	{
	145	struct device_node *node;
	146	struct trusted_foundations_platform_data pdata;
	147	int err;
	148
	149	node = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations");
	150	if (!node)
	151	return;
	152
	153	err = of_property_read_u32(node, "tlm,version-major",
	154	&pdata.version_major);
	155	if (err != 0)
	156	panic("Trusted Foundation: missing version-major property\n");
	157	err = of_property_read_u32(node, "tlm,version-minor",
	158	&pdata.version_minor);
	159	if (err != 0)
	160	panic("Trusted Foundation: missing version-minor property\n");
	161	register_trusted_foundations(&pdata);
	162	}
ebc7c1a2 DO	163
	164	bool trusted_foundations_registered(void)
	165	{
	166	return firmware_ops == &trusted_foundations_ops;
	167	}