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Diffstat (limited to '')
| -rw-r--r-- | plat/rockchip/common/drivers/parameter/ddr_parameter.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/plat/rockchip/common/drivers/parameter/ddr_parameter.c b/plat/rockchip/common/drivers/parameter/ddr_parameter.c new file mode 100644 index 0000000..e89fe1e --- /dev/null +++ b/plat/rockchip/common/drivers/parameter/ddr_parameter.c @@ -0,0 +1,135 @@ +/* + * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <string.h> + +#include <platform_def.h> + +#include <arch_helpers.h> +#include <common/debug.h> +#include <drivers/console.h> +#include <drivers/delay_timer.h> +#include <lib/mmio.h> + +#include <plat_private.h> +#include <soc.h> + +#include "ddr_parameter.h" + +/* + * The miniloader delivers the parameters about ddr usage info from address + * 0x02000000 and the data format is defined as below figure. It tells ATF the + * areas of ddr that are used by platform, we treat them as non-secure regions + * by default. Then we should parse the other part regions and configurate them + * as secure regions to avoid illegal access. + * + * [ddr usage info data format] + * 0x02000000 + * ----------------------------------------------------------------------------- + * | <name> | <size> | <description> | + * ----------------------------------------------------------------------------- + * | count | 4byte | the array numbers of the | + * | | | 'addr_array' and 'size_array' | + * ----------------------------------------------------------------------------- + * | reserved | 4byte | just for 'addr_array' 8byte aligned | + * ----------------------------------------------------------------------------- + * | addr_array[count] | per 8byte | memory region base address | + * ----------------------------------------------------------------------------- + * | size_array[count] | per 8byte | memory region size (byte) | + * ----------------------------------------------------------------------------- + */ + +/* + * function: read parameters info(ns-regions) and try to parse s-regions info + * + * @addr: head address to the ddr usage struct from miniloader + * @max_mb: the max ddr capacity(MB) that the platform support + */ +struct param_ddr_usage ddr_region_usage_parse(uint64_t addr, uint64_t max_mb) +{ + uint64_t base, top; + uint32_t i, addr_offset, size_offset; + struct param_ddr_usage p; + + memset(&p, 0, sizeof(p)); + + /* read how many blocks of ns-regions, read from offset: 0x0 */ + p.ns_nr = mmio_read_32(addr + REGION_NR_OFFSET); + if ((p.ns_nr > DDR_REGION_NR_MAX) || (p.ns_nr == 0)) { + ERROR("over or zero region, nr=%d, max=%d\n", + p.ns_nr, DDR_REGION_NR_MAX); + return p; + } + + /* whole ddr regions boundary, it will be used when parse s-regions */ + p.boundary = max_mb; + + /* calculate ns-region base addr and size offset */ + addr_offset = REGION_ADDR_OFFSET; + size_offset = REGION_ADDR_OFFSET + p.ns_nr * REGION_DATA_PER_BYTES; + + /* read all ns-regions base and top address */ + for (i = 0; i < p.ns_nr; i++) { + base = mmio_read_64(addr + addr_offset); + top = base + mmio_read_64(addr + size_offset); + /* + * translate byte to MB and store info, + * Miniloader will promise every ns-region is MB aligned. + */ + p.ns_base[i] = RG_SIZE_MB(base); + p.ns_top[i] = RG_SIZE_MB(top); + + addr_offset += REGION_DATA_PER_BYTES; + size_offset += REGION_DATA_PER_BYTES; + } + + /* + * a s-region's base starts from previous ns-region's top, and a + * s-region's top ends with next ns-region's base. maybe like this: + * + * case1: ns-regison start from 0MB + * ----------------------------------------------- + * | ns0 | S0 | ns1 | S1 | ns2 | + * 0----------------------------------------------- max_mb + * + * + * case2: ns-regison not start from 0MB + * ----------------------------------------------- + * | S0 | ns0 | ns1 | ns2 | S1 | + * 0----------------------------------------------- max_mb + */ + + /* like above case2 figure, ns-region is not start from 0MB */ + if (p.ns_base[0] != 0) { + p.s_base[p.s_nr] = 0; + p.s_top[p.s_nr] = p.ns_base[0]; + p.s_nr++; + } + + /* + * notice: if ns-regions not start from 0MB, p.s_nr = 1 now, otherwise 0 + */ + for (i = 0; i < p.ns_nr; i++) { + /* + * if current ns-regions top covers boundary, + * that means s-regions are all parsed yet, so finsh. + */ + if (p.ns_top[i] == p.boundary) + goto out; + + /* s-region's base starts from previous ns-region's top */ + p.s_base[p.s_nr] = p.ns_top[i]; + + /* s-region's top ends with next ns-region's base */ + if (i + 1 < p.ns_nr) + p.s_top[p.s_nr] = p.ns_base[i + 1]; + else + p.s_top[p.s_nr] = p.boundary; + p.s_nr++; + } +out: + return p; +} |