forked from Minki/linux
memory: Add LPDDR2-info helpers
Add common helpers for reading and parsing standard LPDDR2 configuration properties. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Link: https://lore.kernel.org/r/20211006224659.21434-9-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
This commit is contained in:
Dmitry Osipenko
Krzysztof Kozlowski
parent
ce004ae6c5
commit
38322cf423
@ -112,6 +112,26 @@
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#define NUM_DDR_ADDR_TABLE_ENTRIES 11
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#define NUM_DDR_TIMING_TABLE_ENTRIES 4
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#define LPDDR2_MANID_SAMSUNG 1
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#define LPDDR2_MANID_QIMONDA 2
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#define LPDDR2_MANID_ELPIDA 3
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#define LPDDR2_MANID_ETRON 4
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#define LPDDR2_MANID_NANYA 5
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#define LPDDR2_MANID_HYNIX 6
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#define LPDDR2_MANID_MOSEL 7
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#define LPDDR2_MANID_WINBOND 8
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#define LPDDR2_MANID_ESMT 9
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#define LPDDR2_MANID_SPANSION 11
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#define LPDDR2_MANID_SST 12
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#define LPDDR2_MANID_ZMOS 13
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#define LPDDR2_MANID_INTEL 14
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#define LPDDR2_MANID_NUMONYX 254
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#define LPDDR2_MANID_MICRON 255
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#define LPDDR2_TYPE_S4 0
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#define LPDDR2_TYPE_S2 1
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#define LPDDR2_TYPE_NVM 2
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/* Structure for DDR addressing info from the JEDEC spec */
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struct lpddr2_addressing {
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u32 num_banks;
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@ -170,6 +190,33 @@ extern const struct lpddr2_timings
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lpddr2_jedec_timings[NUM_DDR_TIMING_TABLE_ENTRIES];
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extern const struct lpddr2_min_tck lpddr2_jedec_min_tck;
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/* Structure of MR8 */
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union lpddr2_basic_config4 {
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u32 value;
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struct {
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unsigned int arch_type : 2;
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unsigned int density : 4;
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unsigned int io_width : 2;
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} __packed;
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};
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/*
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* Structure for information about LPDDR2 chip. All parameters are
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* matching raw values of standard mode register bitfields or set to
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* -ENOENT if info unavailable.
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*/
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struct lpddr2_info {
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int arch_type;
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int density;
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int io_width;
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int manufacturer_id;
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int revision_id1;
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int revision_id2;
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};
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const char *lpddr2_jedec_manufacturer(unsigned int manufacturer_id);
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/*
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* Structure for timings for LPDDR3 based on LPDDR2 plus additional fields.
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* All parameters are in pico seconds(ps) excluding max_freq, min_freq which
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@ -131,3 +131,44 @@ const struct lpddr2_min_tck lpddr2_jedec_min_tck = {
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.tFAW = 8
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};
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EXPORT_SYMBOL_GPL(lpddr2_jedec_min_tck);
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const char *lpddr2_jedec_manufacturer(unsigned int manufacturer_id)
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{
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switch (manufacturer_id) {
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case LPDDR2_MANID_SAMSUNG:
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return "Samsung";
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case LPDDR2_MANID_QIMONDA:
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return "Qimonda";
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case LPDDR2_MANID_ELPIDA:
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return "Elpida";
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case LPDDR2_MANID_ETRON:
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return "Etron";
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case LPDDR2_MANID_NANYA:
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return "Nanya";
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case LPDDR2_MANID_HYNIX:
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return "Hynix";
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case LPDDR2_MANID_MOSEL:
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return "Mosel";
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case LPDDR2_MANID_WINBOND:
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return "Winbond";
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case LPDDR2_MANID_ESMT:
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return "ESMT";
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case LPDDR2_MANID_SPANSION:
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return "Spansion";
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case LPDDR2_MANID_SST:
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return "SST";
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case LPDDR2_MANID_ZMOS:
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return "ZMOS";
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case LPDDR2_MANID_INTEL:
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return "Intel";
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case LPDDR2_MANID_NUMONYX:
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return "Numonyx";
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case LPDDR2_MANID_MICRON:
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return "Micron";
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default:
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break;
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}
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return "invalid";
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}
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EXPORT_SYMBOL_GPL(lpddr2_jedec_manufacturer);
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@ -298,3 +298,90 @@ default_timings:
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return NULL;
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}
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EXPORT_SYMBOL(of_lpddr3_get_ddr_timings);
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/**
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* of_lpddr2_get_info() - extracts information about the lpddr2 chip.
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* @np: Pointer to device tree node containing lpddr2 info
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* @dev: Device requesting info
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*
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* Populates lpddr2_info structure by extracting data from device
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* tree node. Returns pointer to populated structure. If error
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* happened while populating, returns NULL. If property is missing
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* in a device-tree, then the corresponding value is set to -ENOENT.
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*/
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const struct lpddr2_info
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*of_lpddr2_get_info(struct device_node *np, struct device *dev)
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{
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struct lpddr2_info *ret_info, info = {};
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struct property *prop;
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const char *cp;
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int err;
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err = of_property_read_u32(np, "revision-id1", &info.revision_id1);
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if (err)
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info.revision_id1 = -ENOENT;
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err = of_property_read_u32(np, "revision-id2", &info.revision_id2);
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if (err)
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info.revision_id2 = -ENOENT;
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err = of_property_read_u32(np, "io-width", &info.io_width);
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if (err)
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return NULL;
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info.io_width = 32 / info.io_width - 1;
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err = of_property_read_u32(np, "density", &info.density);
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if (err)
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return NULL;
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info.density = ffs(info.density) - 7;
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if (of_device_is_compatible(np, "jedec,lpddr2-s4"))
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info.arch_type = LPDDR2_TYPE_S4;
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else if (of_device_is_compatible(np, "jedec,lpddr2-s2"))
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info.arch_type = LPDDR2_TYPE_S2;
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else if (of_device_is_compatible(np, "jedec,lpddr2-nvm"))
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info.arch_type = LPDDR2_TYPE_NVM;
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else
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return NULL;
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prop = of_find_property(np, "compatible", NULL);
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for (cp = of_prop_next_string(prop, NULL); cp;
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cp = of_prop_next_string(prop, cp)) {
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#define OF_LPDDR2_VENDOR_CMP(compat, ID) \
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if (!of_compat_cmp(cp, compat ",", strlen(compat ","))) { \
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info.manufacturer_id = LPDDR2_MANID_##ID; \
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break; \
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}
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OF_LPDDR2_VENDOR_CMP("samsung", SAMSUNG)
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OF_LPDDR2_VENDOR_CMP("qimonda", QIMONDA)
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OF_LPDDR2_VENDOR_CMP("elpida", ELPIDA)
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OF_LPDDR2_VENDOR_CMP("etron", ETRON)
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OF_LPDDR2_VENDOR_CMP("nanya", NANYA)
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OF_LPDDR2_VENDOR_CMP("hynix", HYNIX)
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OF_LPDDR2_VENDOR_CMP("mosel", MOSEL)
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OF_LPDDR2_VENDOR_CMP("winbond", WINBOND)
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OF_LPDDR2_VENDOR_CMP("esmt", ESMT)
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OF_LPDDR2_VENDOR_CMP("spansion", SPANSION)
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OF_LPDDR2_VENDOR_CMP("sst", SST)
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OF_LPDDR2_VENDOR_CMP("zmos", ZMOS)
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OF_LPDDR2_VENDOR_CMP("intel", INTEL)
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OF_LPDDR2_VENDOR_CMP("numonyx", NUMONYX)
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OF_LPDDR2_VENDOR_CMP("micron", MICRON)
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#undef OF_LPDDR2_VENDOR_CMP
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}
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if (!info.manufacturer_id)
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info.manufacturer_id = -ENOENT;
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ret_info = devm_kzalloc(dev, sizeof(*ret_info), GFP_KERNEL);
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if (ret_info)
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*ret_info = info;
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return ret_info;
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}
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EXPORT_SYMBOL(of_lpddr2_get_info);
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@ -20,6 +20,9 @@ const struct lpddr3_min_tck *of_lpddr3_get_min_tck(struct device_node *np,
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const struct lpddr3_timings *
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of_lpddr3_get_ddr_timings(struct device_node *np_ddr,
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struct device *dev, u32 device_type, u32 *nr_frequencies);
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const struct lpddr2_info *of_lpddr2_get_info(struct device_node *np,
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struct device *dev);
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#else
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static inline const struct lpddr2_min_tck
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*of_get_min_tck(struct device_node *np, struct device *dev)
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@ -46,6 +49,12 @@ static inline const struct lpddr3_timings
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{
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return NULL;
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}
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static inline const struct lpddr2_info
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*of_lpddr2_get_info(struct device_node *np, struct device *dev)
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{
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return NULL;
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}
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#endif /* CONFIG_OF && CONFIG_DDR */
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#endif /* __LINUX_MEMORY_OF_REG_ */
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