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Message-Id: <20211003013235.2357-4-digetx@gmail.com>
Date: Sun, 3 Oct 2021 04:32:34 +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 v3 3/4] memory: Add LPDDR2 configuration helpers
Add helpers for reading and parsing standard LPDDR2 properties.
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
drivers/memory/jedec_ddr.h | 21 +++++++++++++++++
drivers/memory/jedec_ddr_data.c | 42 +++++++++++++++++++++++++++++++++
drivers/memory/of_memory.c | 34 ++++++++++++++++++++++++++
drivers/memory/of_memory.h | 9 +++++++
4 files changed, 106 insertions(+)
diff --git a/drivers/memory/jedec_ddr.h b/drivers/memory/jedec_ddr.h
index e59ccbd982d0..14cef272559e 100644
--- a/drivers/memory/jedec_ddr.h
+++ b/drivers/memory/jedec_ddr.h
@@ -230,4 +230,25 @@ struct lpddr3_min_tck {
u32 tMRD;
};
+union lpddr2_basic_config4 {
+ u32 value;
+
+ struct {
+ unsigned int arch_type : 2;
+ unsigned int density : 4;
+ unsigned int io_width : 2;
+ } __packed;
+};
+
+struct lpddr2_configuration {
+ 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);
+
#endif /* __JEDEC_DDR_H */
diff --git a/drivers/memory/jedec_ddr_data.c b/drivers/memory/jedec_ddr_data.c
index ed601d813175..1f214716ac45 100644
--- a/drivers/memory/jedec_ddr_data.c
+++ b/drivers/memory/jedec_ddr_data.c
@@ -7,6 +7,7 @@
* Aneesh V <aneesh@...com>
*/
+#include <dt-bindings/memory/lpddr2.h>
#include <linux/export.h>
#include "jedec_ddr.h"
@@ -131,3 +132,44 @@ 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..8aa777f2a090 100644
--- a/drivers/memory/of_memory.c
+++ b/drivers/memory/of_memory.c
@@ -298,3 +298,37 @@ const struct lpddr3_timings
return NULL;
}
EXPORT_SYMBOL(of_lpddr3_get_ddr_timings);
+
+/**
+ * of_lpddr2_get_config() - extracts the lpddr2 chip configuration.
+ * @np: Pointer to device tree node containing configuration
+ * @conf: Configuration updated by this function
+ *
+ * Populates lpddr2_configuration structure by extracting data from device
+ * tree node. Returns 0 on success or error code on failure. If property
+ * is missing in device-tree, then the corresponding @conf value is set to
+ * -ENOENT.
+ */
+int of_lpddr2_get_config(struct device_node *np,
+ struct lpddr2_configuration *conf)
+{
+ int err, ret = -ENOENT;
+
+#define OF_LPDDR2_READ_U32(prop, dtprop) \
+ err = of_property_read_u32(np, dtprop, &conf->prop); \
+ if (err) \
+ conf->prop = -ENOENT; \
+ else \
+ ret = 0
+
+ /* at least one property should be parsed */
+ OF_LPDDR2_READ_U32(manufacturer_id, "jedec,lpddr2-manufacturer-id");
+ OF_LPDDR2_READ_U32(revision_id1, "jedec,lpddr2-revision-id1");
+ OF_LPDDR2_READ_U32(revision_id2, "jedec,lpddr2-revision-id2");
+ OF_LPDDR2_READ_U32(io_width, "jedec,lpddr2-io-width-bits");
+ OF_LPDDR2_READ_U32(density, "jedec,lpddr2-density-mbits");
+ OF_LPDDR2_READ_U32(arch_type, "jedec,lpddr2-type");
+
+ return ret;
+}
+EXPORT_SYMBOL(of_lpddr2_get_config);
diff --git a/drivers/memory/of_memory.h b/drivers/memory/of_memory.h
index 4a99b232ab0a..95eccc251b04 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);
+
+int of_lpddr2_get_config(struct device_node *np,
+ struct lpddr2_configuration *conf);
#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 int of_lpddr2_get_config(struct device_node *np,
+ struct lpddr2_configuration *conf)
+{
+ return -ENOENT;
+}
#endif /* CONFIG_OF && CONFIG_DDR */
#endif /* __LINUX_MEMORY_OF_REG_ */
--
2.32.0
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