234 lines
6.2 KiB
C
234 lines
6.2 KiB
C
/*
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* R-Car Generation 2 support
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*
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* Copyright (C) 2013 Renesas Solutions Corp.
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* Copyright (C) 2013 Magnus Damm
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* Copyright (C) 2014 Ulrich Hecht
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk-provider.h>
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#include <linux/clocksource.h>
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#include <linux/device.h>
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#include <linux/dma-contiguous.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/memblock.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/of_platform.h>
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#include <asm/mach/arch.h>
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#include "common.h"
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#include "rcar-gen2.h"
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static const struct of_device_id cpg_matches[] __initconst = {
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{ .compatible = "renesas,rcar-gen2-cpg-clocks", },
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{ .compatible = "renesas,r8a7743-cpg-mssr", .data = "extal" },
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{ .compatible = "renesas,r8a7790-cpg-mssr", .data = "extal" },
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{ .compatible = "renesas,r8a7791-cpg-mssr", .data = "extal" },
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{ .compatible = "renesas,r8a7793-cpg-mssr", .data = "extal" },
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{ /* sentinel */ }
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};
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static unsigned int __init get_extal_freq(void)
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{
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const struct of_device_id *match;
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struct device_node *cpg, *extal;
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u32 freq = 20000000;
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int idx = 0;
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cpg = of_find_matching_node_and_match(NULL, cpg_matches, &match);
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if (!cpg)
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return freq;
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if (match->data)
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idx = of_property_match_string(cpg, "clock-names", match->data);
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extal = of_parse_phandle(cpg, "clocks", idx);
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of_node_put(cpg);
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if (!extal)
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return freq;
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of_property_read_u32(extal, "clock-frequency", &freq);
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of_node_put(extal);
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return freq;
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}
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#define CNTCR 0
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#define CNTFID0 0x20
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void __init rcar_gen2_timer_init(void)
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{
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#ifdef CONFIG_ARM_ARCH_TIMER
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void __iomem *base;
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u32 freq;
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if (of_machine_is_compatible("renesas,r8a7745") ||
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of_machine_is_compatible("renesas,r8a7792") ||
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of_machine_is_compatible("renesas,r8a7794")) {
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freq = 260000000 / 8; /* ZS / 8 */
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/* CNTVOFF has to be initialized either from non-secure
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* Hypervisor mode or secure Monitor mode with SCR.NS==1.
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* If TrustZone is enabled then it should be handled by the
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* secure code.
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*/
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asm volatile(
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" cps 0x16\n"
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" mrc p15, 0, r1, c1, c1, 0\n"
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" orr r0, r1, #1\n"
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" mcr p15, 0, r0, c1, c1, 0\n"
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" isb\n"
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" mov r0, #0\n"
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" mcrr p15, 4, r0, r0, c14\n"
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" isb\n"
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" mcr p15, 0, r1, c1, c1, 0\n"
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" isb\n"
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" cps 0x13\n"
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: : : "r0", "r1");
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} else {
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/* At Linux boot time the r8a7790 arch timer comes up
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* with the counter disabled. Moreover, it may also report
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* a potentially incorrect fixed 13 MHz frequency. To be
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* correct these registers need to be updated to use the
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* frequency EXTAL / 2.
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*/
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freq = get_extal_freq() / 2;
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}
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/* Remap "armgcnt address map" space */
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base = ioremap(0xe6080000, PAGE_SIZE);
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/*
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* Update the timer if it is either not running, or is not at the
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* right frequency. The timer is only configurable in secure mode
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* so this avoids an abort if the loader started the timer and
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* entered the kernel in non-secure mode.
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*/
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if ((ioread32(base + CNTCR) & 1) == 0 ||
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ioread32(base + CNTFID0) != freq) {
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/* Update registers with correct frequency */
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iowrite32(freq, base + CNTFID0);
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asm volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));
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/* make sure arch timer is started by setting bit 0 of CNTCR */
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iowrite32(1, base + CNTCR);
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}
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iounmap(base);
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#endif /* CONFIG_ARM_ARCH_TIMER */
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of_clk_init(NULL);
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timer_probe();
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}
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struct memory_reserve_config {
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u64 reserved;
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u64 base, size;
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};
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static int __init rcar_gen2_scan_mem(unsigned long node, const char *uname,
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int depth, void *data)
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{
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const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
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const __be32 *reg, *endp;
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int l;
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struct memory_reserve_config *mrc = data;
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u64 lpae_start = 1ULL << 32;
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/* We are scanning "memory" nodes only */
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if (type == NULL || strcmp(type, "memory"))
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return 0;
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reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
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if (reg == NULL)
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reg = of_get_flat_dt_prop(node, "reg", &l);
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if (reg == NULL)
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return 0;
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endp = reg + (l / sizeof(__be32));
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while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
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u64 base, size;
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base = dt_mem_next_cell(dt_root_addr_cells, ®);
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size = dt_mem_next_cell(dt_root_size_cells, ®);
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if (base >= lpae_start)
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continue;
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if ((base + size) >= lpae_start)
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size = lpae_start - base;
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if (size < mrc->reserved)
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continue;
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if (base < mrc->base)
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continue;
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/* keep the area at top near the 32-bit legacy limit */
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mrc->base = base + size - mrc->reserved;
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mrc->size = mrc->reserved;
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}
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return 0;
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}
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void __init rcar_gen2_reserve(void)
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{
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struct memory_reserve_config mrc;
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/* reserve 256 MiB at the top of the physical legacy 32-bit space */
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memset(&mrc, 0, sizeof(mrc));
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mrc.reserved = SZ_256M;
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of_scan_flat_dt(rcar_gen2_scan_mem, &mrc);
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#ifdef CONFIG_DMA_CMA
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if (mrc.size && memblock_is_region_memory(mrc.base, mrc.size)) {
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static struct cma *rcar_gen2_dma_contiguous;
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dma_contiguous_reserve_area(mrc.size, mrc.base, 0,
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&rcar_gen2_dma_contiguous, true);
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}
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#endif
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}
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static const char * const rcar_gen2_boards_compat_dt[] __initconst = {
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/*
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* R8A7790 and R8A7791 can't be handled here as long as they need SMP
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* initialization fallback.
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*/
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"renesas,r8a7792",
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"renesas,r8a7793",
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"renesas,r8a7794",
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NULL,
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};
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DT_MACHINE_START(RCAR_GEN2_DT, "Generic R-Car Gen2 (Flattened Device Tree)")
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.init_early = shmobile_init_delay,
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.init_late = shmobile_init_late,
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.init_time = rcar_gen2_timer_init,
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.reserve = rcar_gen2_reserve,
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.dt_compat = rcar_gen2_boards_compat_dt,
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MACHINE_END
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static const char * const rz_g1_boards_compat_dt[] __initconst = {
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"renesas,r8a7743",
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"renesas,r8a7745",
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NULL,
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};
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DT_MACHINE_START(RZ_G1_DT, "Generic RZ/G1 (Flattened Device Tree)")
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.init_early = shmobile_init_delay,
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.init_late = shmobile_init_late,
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.init_time = rcar_gen2_timer_init,
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.reserve = rcar_gen2_reserve,
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.dt_compat = rz_g1_boards_compat_dt,
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MACHINE_END
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