227 lines
5.8 KiB
C
227 lines
5.8 KiB
C
// 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/device.h>
|
|
#include <linux/dma-map-ops.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_clk.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/psci.h>
|
|
#include <asm/mach/arch.h>
|
|
#include <asm/secure_cntvoff.h>
|
|
#include "common.h"
|
|
#include "rcar-gen2.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();
|
|
}
|
|
|
|
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, ®);
|
|
size = dt_mem_next_cell(dt_root_size_cells, ®);
|
|
|
|
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;
|
|
}
|
|
|
|
static 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 = {
|
|
"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,
|
|
.reserve = rcar_gen2_reserve,
|
|
.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,
|
|
.reserve = rcar_gen2_reserve,
|
|
.dt_compat = rz_g1_boards_compat_dt,
|
|
MACHINE_END
|