u-boot/arch/x86/cpu/quark/dram.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

183 lines
5 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*/
#include <common.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <asm/mrccache.h>
#include <asm/mtrr.h>
#include <asm/post.h>
#include <asm/arch/mrc.h>
#include <asm/arch/msg_port.h>
#include <asm/arch/quark.h>
DECLARE_GLOBAL_DATA_PTR;
static __maybe_unused int prepare_mrc_cache(struct mrc_params *mrc_params)
{
struct mrc_data_container *cache;
struct mrc_region entry;
int ret;
ret = mrccache_get_region(NULL, &entry);
if (ret)
return ret;
cache = mrccache_find_current(&entry);
if (!cache)
return -ENOENT;
debug("%s: mrc cache at %p, size %x checksum %04x\n", __func__,
cache->data, cache->data_size, cache->checksum);
/* copy mrc cache to the mrc_params */
memcpy(&mrc_params->timings, cache->data, cache->data_size);
return 0;
}
static int mrc_configure_params(struct mrc_params *mrc_params)
{
const void *blob = gd->fdt_blob;
int node;
int mrc_flags;
node = fdtdec_next_compatible(blob, 0, COMPAT_INTEL_QRK_MRC);
if (node < 0) {
debug("%s: Cannot find MRC node\n", __func__);
return -EINVAL;
}
#ifdef CONFIG_ENABLE_MRC_CACHE
mrc_params->boot_mode = prepare_mrc_cache(mrc_params);
if (mrc_params->boot_mode)
mrc_params->boot_mode = BM_COLD;
else
mrc_params->boot_mode = BM_FAST;
#else
mrc_params->boot_mode = BM_COLD;
#endif
/*
* TODO:
*
* We need determine ECC by pin strap state
*
* Disable ECC by default for now
*/
mrc_params->ecc_enables = 0;
mrc_flags = fdtdec_get_int(blob, node, "flags", 0);
if (mrc_flags & MRC_FLAG_SCRAMBLE_EN)
mrc_params->scrambling_enables = 1;
else
mrc_params->scrambling_enables = 0;
mrc_params->dram_width = fdtdec_get_int(blob, node, "dram-width", 0);
mrc_params->ddr_speed = fdtdec_get_int(blob, node, "dram-speed", 0);
mrc_params->ddr_type = fdtdec_get_int(blob, node, "dram-type", 0);
mrc_params->rank_enables = fdtdec_get_int(blob, node, "rank-mask", 0);
mrc_params->channel_enables = fdtdec_get_int(blob, node,
"chan-mask", 0);
mrc_params->channel_width = fdtdec_get_int(blob, node,
"chan-width", 0);
mrc_params->address_mode = fdtdec_get_int(blob, node, "addr-mode", 0);
mrc_params->refresh_rate = fdtdec_get_int(blob, node,
"refresh-rate", 0);
mrc_params->sr_temp_range = fdtdec_get_int(blob, node,
"sr-temp-range", 0);
mrc_params->ron_value = fdtdec_get_int(blob, node,
"ron-value", 0);
mrc_params->rtt_nom_value = fdtdec_get_int(blob, node,
"rtt-nom-value", 0);
mrc_params->rd_odt_value = fdtdec_get_int(blob, node,
"rd-odt-value", 0);
mrc_params->params.density = fdtdec_get_int(blob, node,
"dram-density", 0);
mrc_params->params.cl = fdtdec_get_int(blob, node, "dram-cl", 0);
mrc_params->params.ras = fdtdec_get_int(blob, node, "dram-ras", 0);
mrc_params->params.wtr = fdtdec_get_int(blob, node, "dram-wtr", 0);
mrc_params->params.rrd = fdtdec_get_int(blob, node, "dram-rrd", 0);
mrc_params->params.faw = fdtdec_get_int(blob, node, "dram-faw", 0);
debug("MRC dram_width %d\n", mrc_params->dram_width);
debug("MRC rank_enables %d\n", mrc_params->rank_enables);
debug("MRC ddr_speed %d\n", mrc_params->ddr_speed);
debug("MRC flags: %s\n",
(mrc_params->scrambling_enables) ? "SCRAMBLE_EN" : "");
debug("MRC density=%d tCL=%d tRAS=%d tWTR=%d tRRD=%d tFAW=%d\n",
mrc_params->params.density, mrc_params->params.cl,
mrc_params->params.ras, mrc_params->params.wtr,
mrc_params->params.rrd, mrc_params->params.faw);
return 0;
}
int dram_init(void)
{
struct mrc_params mrc_params;
#ifdef CONFIG_ENABLE_MRC_CACHE
char *cache;
#endif
int ret;
memset(&mrc_params, 0, sizeof(struct mrc_params));
ret = mrc_configure_params(&mrc_params);
if (ret)
return ret;
/* Set up the DRAM by calling the memory reference code */
mrc_init(&mrc_params);
if (mrc_params.status)
return -EIO;
gd->ram_size = mrc_params.mem_size;
post_code(POST_DRAM);
/* variable range MTRR#2: RAM area */
disable_caches();
msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_VAR_PHYBASE(MTRR_VAR_RAM),
0 | MTRR_TYPE_WRBACK);
msg_port_write(MSG_PORT_HOST_BRIDGE, MTRR_VAR_PHYMASK(MTRR_VAR_RAM),
(~(gd->ram_size - 1)) | MTRR_PHYS_MASK_VALID);
enable_caches();
#ifdef CONFIG_ENABLE_MRC_CACHE
cache = malloc(sizeof(struct mrc_timings));
if (cache) {
memcpy(cache, &mrc_params.timings, sizeof(struct mrc_timings));
gd->arch.mrc_output = cache;
gd->arch.mrc_output_len = sizeof(struct mrc_timings);
}
#endif
return 0;
}
int dram_init_banksize(void)
{
gd->bd->bi_dram[0].start = 0;
gd->bd->bi_dram[0].size = gd->ram_size;
return 0;
}
/*
* This function looks for the highest region of memory lower than 4GB which
* has enough space for U-Boot where U-Boot is aligned on a page boundary.
* It overrides the default implementation found elsewhere which simply
* picks the end of ram, wherever that may be. The location of the stack,
* the relocation address, and how far U-Boot is moved by relocation are
* set in the global data structure.
*/
ulong board_get_usable_ram_top(ulong total_size)
{
return gd->ram_size;
}