diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/ddr_spd.c | 45 | ||||
| -rw-r--r-- | common/fdt_support.c | 132 |
2 files changed, 170 insertions, 7 deletions
diff --git a/common/ddr_spd.c b/common/ddr_spd.c index 7a388bb..438e71a 100644 --- a/common/ddr_spd.c +++ b/common/ddr_spd.c @@ -1,5 +1,5 @@ /* - * Copyright 2008 Freescale Semiconductor, Inc. + * Copyright 2008-2014 Freescale Semiconductor, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License @@ -116,3 +116,46 @@ ddr3_spd_check(const ddr3_spd_eeprom_t *spd) return 1; } } + +unsigned int ddr4_spd_check(const struct ddr4_spd_eeprom_s *spd) +{ + char *p = (char *)spd; + int csum16; + int len; + char crc_lsb; /* byte 126 */ + char crc_msb; /* byte 127 */ + + len = 126; + csum16 = crc16(p, len); + + crc_lsb = (char) (csum16 & 0xff); + crc_msb = (char) (csum16 >> 8); + + if (spd->crc[0] != crc_lsb || spd->crc[1] != crc_msb) { + printf("SPD checksum unexpected.\n" + "Checksum lsb in SPD = %02X, computed SPD = %02X\n" + "Checksum msb in SPD = %02X, computed SPD = %02X\n", + spd->crc[0], crc_lsb, spd->crc[1], crc_msb); + return 1; + } + + p = (char *)((ulong)spd + 128); + len = 126; + csum16 = crc16(p, len); + + crc_lsb = (char) (csum16 & 0xff); + crc_msb = (char) (csum16 >> 8); + + if (spd->mod_section.uc[126] != crc_lsb || + spd->mod_section.uc[127] != crc_msb) { + printf("SPD checksum unexpected.\n" + "Checksum lsb in SPD = %02X, computed SPD = %02X\n" + "Checksum msb in SPD = %02X, computed SPD = %02X\n", + spd->mod_section.uc[126], + crc_lsb, spd->mod_section.uc[127], + crc_msb); + return 1; + } + + return 0; +} diff --git a/common/fdt_support.c b/common/fdt_support.c index f9f358e..fcd2523 100644 --- a/common/fdt_support.c +++ b/common/fdt_support.c @@ -50,6 +50,37 @@ static void write_cell(u8 *addr, u64 val, int size) } /** + * fdt_getprop_u32_default_node - Return a node's property or a default + * + * @fdt: ptr to device tree + * @off: offset of node + * @cell: cell offset in property + * @prop: property name + * @dflt: default value if the property isn't found + * + * Convenience function to return a node's property or a default value if + * the property doesn't exist. + */ +u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell, + const char *prop, const u32 dflt) +{ + const fdt32_t *val; + int len; + + val = fdt_getprop(fdt, off, prop, &len); + + /* Check if property exists */ + if (!val) + return dflt; + + /* Check if property is long enough */ + if (len < ((cell + 1) * sizeof(uint32_t))) + return dflt; + + return fdt32_to_cpu(*val); +} + +/** * fdt_getprop_u32_default - Find a node and return it's property or a default * * @fdt: ptr to device tree @@ -63,18 +94,13 @@ static void write_cell(u8 *addr, u64 val, int size) u32 fdt_getprop_u32_default(const void *fdt, const char *path, const char *prop, const u32 dflt) { - const fdt32_t *val; int off; off = fdt_path_offset(fdt, path); if (off < 0) return dflt; - val = fdt_getprop(fdt, off, prop, NULL); - if (val) - return fdt32_to_cpu(*val); - else - return dflt; + return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt); } /** @@ -1409,3 +1435,97 @@ u64 fdt_get_base_address(void *fdt, int node) return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0; } + +/* + * Read a property of size <prop_len>. Currently only supports 1 or 2 cells. + */ +static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off, + uint64_t *val, int cells) +{ + const fdt32_t *prop32 = &prop[cell_off]; + const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off]; + + if ((cell_off + cells) > prop_len) + return -FDT_ERR_NOSPACE; + + switch (cells) { + case 1: + *val = fdt32_to_cpu(*prop32); + break; + case 2: + *val = fdt64_to_cpu(*prop64); + break; + default: + return -FDT_ERR_NOSPACE; + } + + return 0; +} + +/** + * fdt_read_range - Read a node's n'th range property + * + * @fdt: ptr to device tree + * @node: offset of node + * @n: range index + * @child_addr: pointer to storage for the "child address" field + * @addr: pointer to storage for the CPU view translated physical start + * @len: pointer to storage for the range length + * + * Convenience function that reads and interprets a specific range out of + * a number of the "ranges" property array. + */ +int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr, + uint64_t *addr, uint64_t *len) +{ + int pnode = fdt_parent_offset(fdt, node); + const fdt32_t *ranges; + int pacells; + int acells; + int scells; + int ranges_len; + int cell = 0; + int r = 0; + + /* + * The "ranges" property is an array of + * { <child address> <parent address> <size in child address space> } + * + * All 3 elements can span a diffent number of cells. Fetch their size. + */ + pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1); + acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1); + scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1); + + /* Now try to get the ranges property */ + ranges = fdt_getprop(fdt, node, "ranges", &ranges_len); + if (!ranges) + return -FDT_ERR_NOTFOUND; + ranges_len /= sizeof(uint32_t); + + /* Jump to the n'th entry */ + cell = n * (pacells + acells + scells); + + /* Read <child address> */ + if (child_addr) { + r = fdt_read_prop(ranges, ranges_len, cell, child_addr, + acells); + if (r) + return r; + } + cell += acells; + + /* Read <parent address> */ + if (addr) + *addr = fdt_translate_address(fdt, node, ranges + cell); + cell += pacells; + + /* Read <size in child address space> */ + if (len) { + r = fdt_read_prop(ranges, ranges_len, cell, len, scells); + if (r) + return r; + } + + return 0; +} |