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Date: Wed, 6 Oct 2021 02:00:08 +0300
From: Dmitry Osipenko <digetx@...il.com>
To: Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
Rob Herring <robh+dt@...nel.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-tegra@...r.kernel.org
Subject: [PATCH v4 6/7] memory: Add LPDDR2 configuration helpers
Add common helpers for reading and parsing standard LPDDR2 configuration
properties.
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
drivers/memory/jedec_ddr.h | 46 +++++++++++++++++
drivers/memory/jedec_ddr_data.c | 41 +++++++++++++++
drivers/memory/of_memory.c | 88 +++++++++++++++++++++++++++++++++
drivers/memory/of_memory.h | 9 ++++
4 files changed, 184 insertions(+)
diff --git a/drivers/memory/jedec_ddr.h b/drivers/memory/jedec_ddr.h
index e59ccbd982d0..6bc617ee2e5c 100644
--- a/drivers/memory/jedec_ddr.h
+++ b/drivers/memory/jedec_ddr.h
@@ -112,6 +112,26 @@
#define NUM_DDR_ADDR_TABLE_ENTRIES 11
#define NUM_DDR_TIMING_TABLE_ENTRIES 4
+#define LPDDR2_MANID_SAMSUNG 1
+#define LPDDR2_MANID_QIMONDA 2
+#define LPDDR2_MANID_ELPIDA 3
+#define LPDDR2_MANID_ETRON 4
+#define LPDDR2_MANID_NANYA 5
+#define LPDDR2_MANID_HYNIX 6
+#define LPDDR2_MANID_MOSEL 7
+#define LPDDR2_MANID_WINBOND 8
+#define LPDDR2_MANID_ESMT 9
+#define LPDDR2_MANID_SPANSION 11
+#define LPDDR2_MANID_SST 12
+#define LPDDR2_MANID_ZMOS 13
+#define LPDDR2_MANID_INTEL 14
+#define LPDDR2_MANID_NUMONYX 254
+#define LPDDR2_MANID_MICRON 255
+
+#define LPDDR2_TYPE_S4 0
+#define LPDDR2_TYPE_S2 1
+#define LPDDR2_TYPE_NVM 2
+
/* Structure for DDR addressing info from the JEDEC spec */
struct lpddr2_addressing {
u32 num_banks;
@@ -170,6 +190,32 @@ extern const struct lpddr2_timings
lpddr2_jedec_timings[NUM_DDR_TIMING_TABLE_ENTRIES];
extern const struct lpddr2_min_tck lpddr2_jedec_min_tck;
+/* Structure of MR8 */
+union lpddr2_basic_config4 {
+ u32 value;
+
+ struct {
+ unsigned int arch_type : 2;
+ unsigned int density : 4;
+ unsigned int io_width : 2;
+ } __packed;
+};
+
+/*
+ * Structure for information about LPDDR2 chip. All parameters are matching
+ * raw values of mode register bitfields or negative if info unavailable.
+ */
+struct lpddr2_info {
+ int arch_type;
+ int density;
+ int io_width;
+ int manufacturer_id;
+ int revision_id1;
+ int revision_id2;
+};
+
+const char *lpddr2_jedec_manufacturer(unsigned int manufacturer_id);
+
/*
* Structure for timings for LPDDR3 based on LPDDR2 plus additional fields.
* All parameters are in pico seconds(ps) excluding max_freq, min_freq which
diff --git a/drivers/memory/jedec_ddr_data.c b/drivers/memory/jedec_ddr_data.c
index ed601d813175..2cca4fa188f9 100644
--- a/drivers/memory/jedec_ddr_data.c
+++ b/drivers/memory/jedec_ddr_data.c
@@ -131,3 +131,44 @@ const struct lpddr2_min_tck lpddr2_jedec_min_tck = {
.tFAW = 8
};
EXPORT_SYMBOL_GPL(lpddr2_jedec_min_tck);
+
+const char *lpddr2_jedec_manufacturer(unsigned int manufacturer_id)
+{
+ switch (manufacturer_id) {
+ case LPDDR2_MANID_SAMSUNG:
+ return "Samsung";
+ case LPDDR2_MANID_QIMONDA:
+ return "Qimonda";
+ case LPDDR2_MANID_ELPIDA:
+ return "Elpida";
+ case LPDDR2_MANID_ETRON:
+ return "Etron";
+ case LPDDR2_MANID_NANYA:
+ return "Nanya";
+ case LPDDR2_MANID_HYNIX:
+ return "Hynix";
+ case LPDDR2_MANID_MOSEL:
+ return "Mosel";
+ case LPDDR2_MANID_WINBOND:
+ return "Winbond";
+ case LPDDR2_MANID_ESMT:
+ return "ESMT";
+ case LPDDR2_MANID_SPANSION:
+ return "Spansion";
+ case LPDDR2_MANID_SST:
+ return "SST";
+ case LPDDR2_MANID_ZMOS:
+ return "ZMOS";
+ case LPDDR2_MANID_INTEL:
+ return "Intel";
+ case LPDDR2_MANID_NUMONYX:
+ return "Numonyx";
+ case LPDDR2_MANID_MICRON:
+ return "Micron";
+ default:
+ break;
+ }
+
+ return "invalid";
+}
+EXPORT_SYMBOL_GPL(lpddr2_jedec_manufacturer);
diff --git a/drivers/memory/of_memory.c b/drivers/memory/of_memory.c
index d9f5437d3bce..60ecd52680a8 100644
--- a/drivers/memory/of_memory.c
+++ b/drivers/memory/of_memory.c
@@ -298,3 +298,91 @@ const struct lpddr3_timings
return NULL;
}
EXPORT_SYMBOL(of_lpddr3_get_ddr_timings);
+
+/**
+ * of_lpddr2_get_info() - extracts information about the lpddr2 chip.
+ * @np: Pointer to device tree node containing lpddr2 info
+ * @dev: Device requesting info
+ *
+ * Populates lpddr2_info structure by extracting data from device
+ * tree node. Returns pointer to populated structure. If error
+ * happened while populating, returns NULL. If property is missing
+ * in a device-tree, then the corresponding value is set to -ENOENT.
+ */
+const struct lpddr2_info
+*of_lpddr2_get_info(struct device_node *np, struct device *dev)
+{
+ struct lpddr2_info *ret_info, info = {};
+ struct property *prop;
+ const char *cp;
+ int err;
+
+ err = of_property_read_u32(np, "revision-id1", &info.revision_id1);
+ if (err)
+ info.revision_id1 = -ENOENT;
+
+ err = of_property_read_u32(np, "revision-id2", &info.revision_id2);
+ if (err)
+ info.revision_id2 = -ENOENT;
+
+ err = of_property_read_u32(np, "io-width", &info.io_width);
+ if (err)
+ return NULL;
+
+ info.io_width = 32 / info.io_width - 1;
+
+ err = of_property_read_u32(np, "density", &info.density);
+ if (err)
+ return NULL;
+
+ info.density = ffs(info.density) - 7;
+
+ if (of_device_is_compatible(np, "jedec,lpddr2-s4"))
+ info.arch_type = LPDDR2_TYPE_S4;
+ else if (of_device_is_compatible(np, "jedec,lpddr2-s2"))
+ info.arch_type = LPDDR2_TYPE_S2;
+ else if (of_device_is_compatible(np, "jedec,lpddr2-nvm"))
+ info.arch_type = LPDDR2_TYPE_NVM;
+ else
+ return NULL;
+
+ prop = of_find_property(np, "compatible", NULL);
+ for (cp = of_prop_next_string(prop, NULL); cp;
+ cp = of_prop_next_string(prop, cp)) {
+
+#define OF_LPDDR2_COMPAT(compat, ID) \
+ /* legacy Elpida compatible starts with a capital letter */ \
+ if (!strncasecmp(cp, compat ",", strlen(compat ","))) { \
+ info.manufacturer_id = LPDDR2_MANID_##ID; \
+ break; \
+ }
+
+ OF_LPDDR2_COMPAT("samsung", SAMSUNG)
+ OF_LPDDR2_COMPAT("qimonda", QIMONDA)
+ OF_LPDDR2_COMPAT("etron", ETRON)
+ OF_LPDDR2_COMPAT("nanya", NANYA)
+ OF_LPDDR2_COMPAT("hynix", HYNIX)
+ OF_LPDDR2_COMPAT("mosel", MOSEL)
+ OF_LPDDR2_COMPAT("winbond", WINBOND)
+ OF_LPDDR2_COMPAT("esmt", ESMT)
+ OF_LPDDR2_COMPAT("spansion", SPANSION)
+ OF_LPDDR2_COMPAT("sst", SST)
+ OF_LPDDR2_COMPAT("zmos", ZMOS)
+ OF_LPDDR2_COMPAT("intel", INTEL)
+ OF_LPDDR2_COMPAT("numonyx", NUMONYX)
+ OF_LPDDR2_COMPAT("micron", MICRON)
+ OF_LPDDR2_COMPAT("elpida", ELPIDA)
+
+#undef OF_LPDDR2_COMPAT
+ }
+
+ if (!info.manufacturer_id)
+ info.manufacturer_id = -ENOENT;
+
+ ret_info = devm_kzalloc(dev, sizeof(*ret_info), GFP_KERNEL);
+ if (ret_info)
+ *ret_info = info;
+
+ return ret_info;
+}
+EXPORT_SYMBOL(of_lpddr2_get_info);
diff --git a/drivers/memory/of_memory.h b/drivers/memory/of_memory.h
index 4a99b232ab0a..1c4e47fede8a 100644
--- a/drivers/memory/of_memory.h
+++ b/drivers/memory/of_memory.h
@@ -20,6 +20,9 @@ const struct lpddr3_min_tck *of_lpddr3_get_min_tck(struct device_node *np,
const struct lpddr3_timings *
of_lpddr3_get_ddr_timings(struct device_node *np_ddr,
struct device *dev, u32 device_type, u32 *nr_frequencies);
+
+const struct lpddr2_info *of_lpddr2_get_info(struct device_node *np,
+ struct device *dev);
#else
static inline const struct lpddr2_min_tck
*of_get_min_tck(struct device_node *np, struct device *dev)
@@ -46,6 +49,12 @@ static inline const struct lpddr3_timings
{
return NULL;
}
+
+static inline const struct lpddr2_info
+ *of_lpddr2_get_info(struct device_node *np, struct device *dev)
+{
+ return NULL;
+}
#endif /* CONFIG_OF && CONFIG_DDR */
#endif /* __LINUX_MEMORY_OF_REG_ */
--
2.32.0
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