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// SPDX-License-Identifier: GPL-2.0
/*
* R-Car Generation 2 support
*
* Copyright (C) 2013 Renesas Solutions Corp.
* Copyright (C) 2013 Magnus Damm
* Copyright (C) 2014 Ulrich Hecht
*/
#include <linux/clocksource.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/of_clk.h>
#include <linux/psci.h>
#include <asm/mach/arch.h>
#include <asm/secure_cntvoff.h>
#include "common.h"
static const struct of_device_id cpg_matches[] __initconst = {
{ .compatible = "renesas,r8a7742-cpg-mssr", .data = "extal" },
{ .compatible = "renesas,r8a7743-cpg-mssr", .data = "extal" },
{ .compatible = "renesas,r8a7744-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
static void __init rcar_gen2_timer_init(void)
{
bool need_update = true;
void __iomem *base;
u32 freq;
/*
* If PSCI is available then most likely we are running on PSCI-enabled
* U-Boot which, we assume, has already taken care of resetting CNTVOFF
* and updating counter module before switching to non-secure mode
* and we don't need to.
*/
#ifdef CONFIG_ARM_PSCI_FW
if (psci_ops.cpu_on)
need_update = false;
#endif
if (need_update == false)
goto skip_update;
secure_cntvoff_init();
if (of_machine_is_compatible("renesas,r8a7745") ||
of_machine_is_compatible("renesas,r8a77470") ||
of_machine_is_compatible("renesas,r8a7792") ||
of_machine_is_compatible("renesas,r8a7794")) {
freq = 260000000 / 8; /* ZS / 8 */
} 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);
skip_update:
of_clk_init(NULL);
timer_probe();
}
static const char * const rcar_gen2_boards_compat_dt[] __initconst = {
"renesas,r8a7790",
"renesas,r8a7791",
"renesas,r8a7792",
"renesas,r8a7793",
"renesas,r8a7794",
NULL
};
DT_MACHINE_START(RCAR_GEN2_DT, "Generic R-Car Gen2 (Flattened Device Tree)")
.init_late = shmobile_init_late,
.init_time = rcar_gen2_timer_init,
.dt_compat = rcar_gen2_boards_compat_dt,
MACHINE_END
static const char * const rz_g1_boards_compat_dt[] __initconst = {
"renesas,r8a7742",
"renesas,r8a7743",
"renesas,r8a7744",
"renesas,r8a7745",
"renesas,r8a77470",
NULL
};
DT_MACHINE_START(RZ_G1_DT, "Generic RZ/G1 (Flattened Device Tree)")
.init_late = shmobile_init_late,
.init_time = rcar_gen2_timer_init,
.dt_compat = rz_g1_boards_compat_dt,
MACHINE_END
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