src/vendorcode/cavium/bdk/libbdk-dram/bdk-dram-config.c

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#include <bdk.h>
#include <string.h>
#include <libbdk-hal/bdk-config.h>
#include <libbdk-hal/bdk-l2c.h>

BDK_REQUIRE_DEFINE(DRAM_CONFIG);

/**
 * Lookup a DRAM configuration by name and initialize DRAM using it
 *
 * @param node   Node to configure
 * @param ddr_clock_override
 *               If non zero, override the DRAM frequency specified
 *               in the config with this value
 *
 * @return Amount of DRAM in MB, or negative on failure
 */
int bdk_dram_config(int node, int ddr_clock_override)
{
    const dram_config_t *config = libdram_config_load(node);
    if (!config)
    {
        printf("N%d: No DRAM config specified, skipping DRAM init\n", node);
        return 0;
    }

    BDK_TRACE(DRAM, "N%d: Starting DRAM init (config=%p, ddr_clock_override=%d)\n", node, config, ddr_clock_override);
    int mbytes = libdram_config(node, config, ddr_clock_override);
    BDK_TRACE(DRAM, "N%d: DRAM init returned %d\n", node, mbytes);
    if (mbytes <= 0)
    {
        printf("ERROR: DDR initialization failed\n");
        return -1;
    }

    return mbytes;
}

/**
 * Do all the DRAM Margin tests
 *
 * @param node   Node to test
 *
 * @return Success or Fail
 */
void bdk_dram_margin(int node)
{
    BDK_TRACE(DRAM, "N%d: Starting DRAM margining\n", node);
    libdram_margin(node);
    BDK_TRACE(DRAM, "N%d: Finished DRAM margining.\n", node);
    return;
}

/**
 * Return the string of the DRAM configuration info at the specified node.
 * If the node is not configured, NULL is returned.
 *
 * @param node   node to retrieve
 *
 * @return string or NULL
 */
const char* bdk_dram_get_info_string(int node)
{
    #define INFO_STRING_LEN 40
    static char info_string[INFO_STRING_LEN];
    static const char *info_ptr = info_string;

    snprintf(info_string, INFO_STRING_LEN,
             " %ld MB, %ld MT/s, %s %s",
             bdk_dram_get_size_mbytes(node),
             libdram_get_freq_from_pll(node, 0) / 1000000,
             (__bdk_dram_is_ddr4(node, 0)) ? "DDR4" : "DDR3",
             (__bdk_dram_is_rdimm(node, 0)) ? "RDIMM" : "UDIMM");

    return info_ptr;
}


/**
 * Return the highest address currently used by the BDK. This address will
 * be about 4MB above the top of the BDK to make sure small growths between the
 * call and its use don't cause corruption. Any call to memory allocation can
 * change this value.
 *
 * @return Size of the BDK in bytes
 */
uint64_t bdk_dram_get_top_of_bdk(void)
{
    /* Make sure the start address is higher that the BDK's active range.
     *
     * As sbrk() returns a node address, mask off the node portion of
     * the address to make it a physical offset. Doing this simplifies the
     * address checks and calculations which only work with physical offsets.
     */
	/* FIXME(dhendrix): we only care about node 0 */
//    uint64_t top_of_bdk = (bdk_ptr_to_phys(sbrk(0)) & bdk_build_mask(40));
    uint64_t top_of_bdk = 0;
    uint64_t l2_size = bdk_l2c_get_cache_size_bytes(bdk_numa_master());
    if (top_of_bdk <= l2_size)
    {
        /* Early BDK code takes care of the first L2 sized area of memory */
        top_of_bdk = l2_size;
    }
    else
    {
        /* Give 4MB of extra so the BDK has room to grow */
        top_of_bdk += 4 << 20;
        /* Align it on a 64KB boundary */
        top_of_bdk >>= 16;
        top_of_bdk <<= 16;
    }
    return top_of_bdk;
}