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https://github.com/brain-hackers/u-boot-brain
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aff151e5b2
Implement DM driver for the Renesas PRR into RCar cpu info and convert all users with DM and OF enabled to this new driver. This means all of the boards with DM and OF enabled can fetch PRR address from DT, which is useful on ie. V3M which has different PRR address than the rest of Gen3 SoCs. Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
93 lines
1.7 KiB
C
93 lines
1.7 KiB
C
/*
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* arch/arm/cpu/armv7/rmobile/cpu_info-rcar.c
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*
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* Copyright (C) 2013,2014 Renesas Electronics Corporation
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <common.h>
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#include <asm/io.h>
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#define PRR_MASK 0x7fff
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#define R8A7796_REV_1_0 0x5200
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#define R8A7796_REV_1_1 0x5210
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static u32 rmobile_get_prr(void);
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u32 rmobile_get_cpu_type(void)
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{
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return (rmobile_get_prr() & 0x00007F00) >> 8;
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}
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u32 rmobile_get_cpu_rev_integer(void)
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{
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const u32 prr = rmobile_get_prr();
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if ((prr & PRR_MASK) == R8A7796_REV_1_1)
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return 1;
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else
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return ((prr & 0x000000F0) >> 4) + 1;
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}
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u32 rmobile_get_cpu_rev_fraction(void)
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{
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const u32 prr = rmobile_get_prr();
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if ((prr & PRR_MASK) == R8A7796_REV_1_1)
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return 1;
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else
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return prr & 0x0000000F;
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}
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#if !CONFIG_IS_ENABLED(DM) || !CONFIG_IS_ENABLED(SYSCON)
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static u32 rmobile_get_prr(void)
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{
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/*
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* On RCar/RMobile Gen2 and older systems, the PRR is always
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* located at the address below. On newer systems, the PRR
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* may be located at different address, but that information
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* is obtained from DT. This code will be removed when all
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* of the older systems get converted to DM and OF control.
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*/
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return readl(0xFF000044);
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}
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#else
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#include <dm.h>
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#include <syscon.h>
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#include <regmap.h>
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struct renesas_prr_priv {
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fdt_addr_t regs;
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};
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enum {
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PRR_RCAR,
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};
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static u32 rmobile_get_prr(void)
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{
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struct regmap *map;
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map = syscon_get_regmap_by_driver_data(PRR_RCAR);
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if (!map) {
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printf("PRR regmap failed!\n");
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hang();
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}
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return readl(map->base);
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}
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static const struct udevice_id renesas_prr_ids[] = {
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{ .compatible = "renesas,prr", .data = PRR_RCAR },
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{ }
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};
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U_BOOT_DRIVER(renesas_prr) = {
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.name = "renesas_prr",
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.id = UCLASS_SYSCON,
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.of_match = renesas_prr_ids,
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.flags = DM_FLAG_PRE_RELOC,
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};
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#endif
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