* [PATCH v2 1/4] dt-bindings: memory: Add LPDDR2 binding
2021-10-03 0:35 [PATCH v2 0/4] tegra20-emc: Identify memory chip by LPDDR configuration Dmitry Osipenko
@ 2021-10-03 0:35 ` Dmitry Osipenko
2021-10-03 0:35 ` [PATCH v2 2/4] dt-bindings: memory: tegra20: emc: Document new LPDDR2 sub-node Dmitry Osipenko
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Dmitry Osipenko @ 2021-10-03 0:35 UTC (permalink / raw)
To: Thierry Reding, Jonathan Hunter, Krzysztof Kozlowski, Rob Herring
Cc: devicetree, linux-kernel, linux-tegra
Add binding for standard LPDDR2 memory chip properties.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
.../memory-controllers/jedec,lpddr2.yaml | 80 +++++++++++++++++++
include/dt-bindings/memory/lpddr2.h | 25 ++++++
2 files changed, 105 insertions(+)
create mode 100644 Documentation/devicetree/bindings/memory-controllers/jedec,lpddr2.yaml
create mode 100644 include/dt-bindings/memory/lpddr2.h
diff --git a/Documentation/devicetree/bindings/memory-controllers/jedec,lpddr2.yaml b/Documentation/devicetree/bindings/memory-controllers/jedec,lpddr2.yaml
new file mode 100644
index 000000000000..ef227eba1e4a
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/jedec,lpddr2.yaml
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/jedec,lpddr2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: JEDEC LPDDR2 SDRAM
+
+maintainers:
+ - Krzysztof Kozlowski <krzk@kernel.org>
+
+properties:
+ jedec,lpddr2-manufacturer-id:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ maximum: 255
+ description: |
+ Unique manufacturer ID of SDRAM chip. See MR5 description in JESD209-2.
+
+ jedec,lpddr2-revision-id1:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ maximum: 255
+ description: |
+ Revision 1 value of SDRAM chip.
+ See MR6 description in chip vendor specification.
+
+ jedec,lpddr2-revision-id2:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ maximum: 255
+ description: |
+ Revision 2 value of SDRAM chip.
+ See MR7 description in chip vendor specification.
+
+ jedec,lpddr2-density-mbits:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Density in megabits of SDRAM chip. See MR8 description in JESD209-2.
+ enum:
+ - 64
+ - 128
+ - 256
+ - 512
+ - 1024
+ - 2048
+ - 4096
+ - 8192
+ - 16384
+ - 32768
+
+ jedec,lpddr2-io-width-bits:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ IO bus width in bits of SDRAM chip. See MR8 description in JESD209-2.
+ enum:
+ - 32
+ - 16
+ - 8
+
+ jedec,lpddr2-type:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ LPDDR type which corresponds to a number of words SDRAM pre-fetches
+ per column request. See MR8 description in JESD209-2.
+ enum:
+ - 0 # S4 (4 words prefetch architecture)
+ - 1 # S2 (2 words prefetch architecture)
+ - 2 # NVM (Non-volatile memory)
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/memory/lpddr2.h>
+
+ lpddr2 {
+ jedec,lpddr2-manufacturer-id = <LPDDR2_MANID_ELPIDA>;
+ jedec,lpddr2-revision-id1 = <1>;
+ jedec,lpddr2-density-mbits = <2048>;
+ jedec,lpddr2-io-width-bits = <16>;
+ jedec,lpddr2-type = <LPDDR2_TYPE_S4>;
+ };
diff --git a/include/dt-bindings/memory/lpddr2.h b/include/dt-bindings/memory/lpddr2.h
new file mode 100644
index 000000000000..e837b0d8a11e
--- /dev/null
+++ b/include/dt-bindings/memory/lpddr2.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
+#ifndef _DT_BINDINGS_LPDDR2_H
+#define _DT_BINDINGS_LPDDR2_H
+
+#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
+
+#endif /*_DT_BINDINGS_LPDDR2_H */
--
2.32.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2 3/4] memory: Add LPDDR2 configuration helpers
2021-10-03 0:35 [PATCH v2 0/4] tegra20-emc: Identify memory chip by LPDDR configuration Dmitry Osipenko
2021-10-03 0:35 ` [PATCH v2 1/4] dt-bindings: memory: Add LPDDR2 binding Dmitry Osipenko
2021-10-03 0:35 ` [PATCH v2 2/4] dt-bindings: memory: tegra20: emc: Document new LPDDR2 sub-node Dmitry Osipenko
@ 2021-10-03 0:35 ` Dmitry Osipenko
2021-10-03 0:35 ` [PATCH v2 4/4] memory: tegra20-emc: Support matching timings by LPDDR2 configuration Dmitry Osipenko
3 siblings, 0 replies; 6+ messages in thread
From: Dmitry Osipenko @ 2021-10-03 0:35 UTC (permalink / raw)
To: Thierry Reding, Jonathan Hunter, Krzysztof Kozlowski, Rob Herring
Cc: devicetree, linux-kernel, linux-tegra
Add helpers for reading and parsing standard LPDDR2 properties.
Signed-off-by: Dmitry Osipenko <digetx@gmail.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@ti.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
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2 4/4] memory: tegra20-emc: Support matching timings by LPDDR2 configuration
2021-10-03 0:35 [PATCH v2 0/4] tegra20-emc: Identify memory chip by LPDDR configuration Dmitry Osipenko
` (2 preceding siblings ...)
2021-10-03 0:35 ` [PATCH v2 3/4] memory: Add LPDDR2 configuration helpers Dmitry Osipenko
@ 2021-10-03 0:35 ` Dmitry Osipenko
3 siblings, 0 replies; 6+ messages in thread
From: Dmitry Osipenko @ 2021-10-03 0:35 UTC (permalink / raw)
To: Thierry Reding, Jonathan Hunter, Krzysztof Kozlowski, Rob Herring
Cc: devicetree, linux-kernel, linux-tegra
Asus Transformer TF101 doesn't provide RAM code and in this case memory
timings should be selected based on identity information read out from
SDRAM chip. Support matching timings by LPDDR2 configuration.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/memory/tegra/Kconfig | 1 +
drivers/memory/tegra/tegra20-emc.c | 191 +++++++++++++++++++++++++++--
2 files changed, 179 insertions(+), 13 deletions(-)
diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig
index f9bae36c03a3..7951764b4efe 100644
--- a/drivers/memory/tegra/Kconfig
+++ b/drivers/memory/tegra/Kconfig
@@ -16,6 +16,7 @@ config TEGRA20_EMC
depends on ARCH_TEGRA_2x_SOC || COMPILE_TEST
select DEVFREQ_GOV_SIMPLE_ONDEMAND
select PM_DEVFREQ
+ select DDR
help
This driver is for the External Memory Controller (EMC) found on
Tegra20 chips. The EMC controls the external DRAM on the board.
diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
index c3462dbc8c22..8965cdff43b9 100644
--- a/drivers/memory/tegra/tegra20-emc.c
+++ b/drivers/memory/tegra/tegra20-emc.c
@@ -5,6 +5,7 @@
* Author: Dmitry Osipenko <digetx@gmail.com>
*/
+#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/clk/tegra.h>
#include <linux/debugfs.h>
@@ -27,11 +28,15 @@
#include <soc/tegra/common.h>
#include <soc/tegra/fuse.h>
+#include "../jedec_ddr.h"
+#include "../of_memory.h"
+
#include "mc.h"
#define EMC_INTSTATUS 0x000
#define EMC_INTMASK 0x004
#define EMC_DBG 0x008
+#define EMC_ADR_CFG_0 0x010
#define EMC_TIMING_CONTROL 0x028
#define EMC_RC 0x02c
#define EMC_RFC 0x030
@@ -68,6 +73,7 @@
#define EMC_QUSE_EXTRA 0x0ac
#define EMC_ODT_WRITE 0x0b0
#define EMC_ODT_READ 0x0b4
+#define EMC_MRR 0x0ec
#define EMC_FBIO_CFG5 0x104
#define EMC_FBIO_CFG6 0x114
#define EMC_STAT_CONTROL 0x160
@@ -94,6 +100,7 @@
#define EMC_REFRESH_OVERFLOW_INT BIT(3)
#define EMC_CLKCHANGE_COMPLETE_INT BIT(4)
+#define EMC_MRR_DIVLD_INT BIT(5)
#define EMC_DBG_READ_MUX_ASSEMBLY BIT(0)
#define EMC_DBG_WRITE_MUX_ACTIVE BIT(1)
@@ -102,11 +109,25 @@
#define EMC_DBG_CFG_PRIORITY BIT(24)
#define EMC_FBIO_CFG5_DRAM_WIDTH_X16 BIT(4)
+#define EMC_FBIO_CFG5_DRAM_TYPE GENMASK(1, 0)
+
+#define EMC_MRR_DEV_SELECTN GENMASK(31, 30)
+#define EMC_MRR_MRR_MA GENMASK(23, 16)
+#define EMC_MRR_MRR_DATA GENMASK(15, 0)
+
+#define EMC_ADR_CFG_0_EMEM_NUMDEV GENMASK(25, 24)
#define EMC_PWR_GATHER_CLEAR (1 << 8)
#define EMC_PWR_GATHER_DISABLE (2 << 8)
#define EMC_PWR_GATHER_ENABLE (3 << 8)
+enum emc_dram_type {
+ DRAM_TYPE_RESERVED,
+ DRAM_TYPE_DDR1,
+ DRAM_TYPE_LPDDR2,
+ DRAM_TYPE_DDR2,
+};
+
static const u16 emc_timing_registers[] = {
EMC_RC,
EMC_RFC,
@@ -201,6 +222,12 @@ struct tegra_emc {
struct mutex rate_lock;
struct devfreq_simple_ondemand_data ondemand_data;
+
+ /* memory chip identity information */
+ union lpddr2_basic_config4 basic_conf4;
+ unsigned int manufacturer_id;
+ unsigned int revision_id1;
+ unsigned int revision_id2;
};
static irqreturn_t tegra_emc_isr(int irq, void *data)
@@ -401,6 +428,9 @@ static int tegra_emc_load_timings_from_dt(struct tegra_emc *emc,
timing = emc->timings;
for_each_child_of_node(node, child) {
+ if (of_node_name_eq(child, "lpddr2-configuration"))
+ continue;
+
err = load_one_timing_from_dt(emc, timing++, child);
if (err) {
of_node_put(child);
@@ -422,8 +452,9 @@ static int tegra_emc_load_timings_from_dt(struct tegra_emc *emc,
}
static struct device_node *
-tegra_emc_find_node_by_ram_code(struct device *dev)
+tegra_emc_find_node_by_ram_code(struct tegra_emc *emc)
{
+ struct device *dev = emc->dev;
struct device_node *np;
u32 value, ram_code;
int err;
@@ -442,8 +473,53 @@ tegra_emc_find_node_by_ram_code(struct device *dev)
np = of_find_node_by_name(np, "emc-tables")) {
err = of_property_read_u32(np, "nvidia,ram-code", &value);
if (err || value != ram_code) {
- of_node_put(np);
- continue;
+ struct device_node *lpddr2_np;
+ bool conf_mismatches = false;
+
+ lpddr2_np = of_find_node_by_name(np, "lpddr2-configuration");
+ if (lpddr2_np) {
+ struct lpddr2_configuration cfg;
+
+ err = of_lpddr2_get_config(lpddr2_np, &cfg);
+ if (!err) {
+ if (cfg.manufacturer_id >= 0 &&
+ cfg.manufacturer_id != emc->manufacturer_id)
+ conf_mismatches = true;
+
+ if (cfg.revision_id1 >= 0 &&
+ cfg.revision_id1 != emc->revision_id1)
+ conf_mismatches = true;
+
+ if (cfg.revision_id2 >= 0 &&
+ cfg.revision_id2 != emc->revision_id2)
+ conf_mismatches = true;
+
+ if (cfg.density >= 0 &&
+ cfg.density != 64 << emc->basic_conf4.density)
+ conf_mismatches = true;
+
+ if (cfg.io_width >= 0 &&
+ cfg.io_width != 32 >> emc->basic_conf4.io_width)
+ conf_mismatches = true;
+
+ if (cfg.arch_type >= 0 &&
+ cfg.arch_type != emc->basic_conf4.arch_type)
+ conf_mismatches = true;
+ } else {
+ dev_err(emc->dev, "failed to parse %pOF: %d\n",
+ lpddr2_np, err);
+ conf_mismatches = true;
+ }
+
+ of_node_put(lpddr2_np);
+ } else {
+ conf_mismatches = true;
+ }
+
+ if (conf_mismatches) {
+ of_node_put(np);
+ continue;
+ }
}
return np;
@@ -455,10 +531,70 @@ tegra_emc_find_node_by_ram_code(struct device *dev)
return NULL;
}
+static int emc_read_lpddr_mode_register(struct tegra_emc *emc,
+ unsigned int emem_dev,
+ unsigned int register_addr,
+ unsigned int *register_data)
+{
+ u32 val, memory_dev = emem_dev + 1, mr_mask = 0xff;
+ int err;
+
+ /* clear data-valid interrupt status */
+ writel_relaxed(EMC_MRR_DIVLD_INT, emc->regs + EMC_INTSTATUS);
+
+ /* issue mode register read request */
+ val = FIELD_PREP(EMC_MRR_DEV_SELECTN, memory_dev);
+ val |= FIELD_PREP(EMC_MRR_MRR_MA, register_addr);
+
+ writel_relaxed(val, emc->regs + EMC_MRR);
+
+ /* wait for the LPDDR2 data-valid interrupt */
+ err = readl_relaxed_poll_timeout_atomic(emc->regs + EMC_INTSTATUS, val,
+ val & EMC_MRR_DIVLD_INT,
+ 1, 100);
+ if (err) {
+ dev_err(emc->dev, "mode-register %u read failed: %d\n",
+ register_addr, err);
+ return err;
+ }
+
+ /* read out register data */
+ val = readl_relaxed(emc->regs + EMC_MRR);
+ *register_data = FIELD_GET(EMC_MRR_MRR_DATA, val) & mr_mask;
+
+ return 0;
+}
+
+static void emc_read_lpddr_sdram_info(struct tegra_emc *emc,
+ unsigned int emem_dev,
+ bool print_out)
+{
+ /* these registers are standard for all LPDDR JEDEC memory chips */
+ emc_read_lpddr_mode_register(emc, emem_dev, 5, &emc->manufacturer_id);
+ emc_read_lpddr_mode_register(emc, emem_dev, 6, &emc->revision_id1);
+ emc_read_lpddr_mode_register(emc, emem_dev, 7, &emc->revision_id2);
+ emc_read_lpddr_mode_register(emc, emem_dev, 8, &emc->basic_conf4.value);
+
+ if (!print_out)
+ return;
+
+ dev_info(emc->dev, "SDRAM[dev%u]: manufacturer: 0x%x (%s) rev1: 0x%x rev2: 0x%x prefetch: S%u density: %uMbit iowidth: %ubit\n",
+ emem_dev, emc->manufacturer_id,
+ lpddr2_jedec_manufacturer(emc->manufacturer_id),
+ emc->revision_id1, emc->revision_id2,
+ 4 >> emc->basic_conf4.arch_type,
+ 64 << emc->basic_conf4.density,
+ 32 >> emc->basic_conf4.io_width);
+}
+
static int emc_setup_hw(struct tegra_emc *emc)
{
+ u32 emc_cfg, emc_dbg, emc_fbio, emc_adr_cfg;
u32 intmask = EMC_REFRESH_OVERFLOW_INT;
- u32 emc_cfg, emc_dbg, emc_fbio;
+ static bool print_sdram_info_once;
+ enum emc_dram_type dram_type;
+ const char *dram_type_str;
+ unsigned int emem_numdev;
emc_cfg = readl_relaxed(emc->regs + EMC_CFG_2);
@@ -496,7 +632,36 @@ static int emc_setup_hw(struct tegra_emc *emc)
else
emc->dram_bus_width = 32;
- dev_info_once(emc->dev, "%ubit DRAM bus\n", emc->dram_bus_width);
+ dram_type = FIELD_GET(EMC_FBIO_CFG5_DRAM_TYPE, emc_fbio);
+
+ switch (dram_type) {
+ case DRAM_TYPE_RESERVED:
+ dram_type_str = "INVALID";
+ break;
+ case DRAM_TYPE_DDR1:
+ dram_type_str = "DDR1";
+ break;
+ case DRAM_TYPE_LPDDR2:
+ dram_type_str = "LPDDR2";
+ break;
+ case DRAM_TYPE_DDR2:
+ dram_type_str = "DDR2";
+ break;
+ }
+
+ emc_adr_cfg = readl_relaxed(emc->regs + EMC_ADR_CFG_0);
+ emem_numdev = FIELD_GET(EMC_ADR_CFG_0_EMEM_NUMDEV, emc_adr_cfg) + 1;
+
+ dev_info_once(emc->dev, "%ubit DRAM bus, %u %s %s attached\n",
+ emc->dram_bus_width, emem_numdev, dram_type_str,
+ emem_numdev == 2 ? "devices" : "device");
+
+ if (dram_type == DRAM_TYPE_LPDDR2) {
+ while (emem_numdev--)
+ emc_read_lpddr_sdram_info(emc, emem_numdev,
+ !print_sdram_info_once);
+ print_sdram_info_once = true;
+ }
return 0;
}
@@ -1049,14 +1214,6 @@ static int tegra_emc_probe(struct platform_device *pdev)
emc->clk_nb.notifier_call = tegra_emc_clk_change_notify;
emc->dev = &pdev->dev;
- np = tegra_emc_find_node_by_ram_code(&pdev->dev);
- if (np) {
- err = tegra_emc_load_timings_from_dt(emc, np);
- of_node_put(np);
- if (err)
- return err;
- }
-
emc->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(emc->regs))
return PTR_ERR(emc->regs);
@@ -1065,6 +1222,14 @@ static int tegra_emc_probe(struct platform_device *pdev)
if (err)
return err;
+ np = tegra_emc_find_node_by_ram_code(emc);
+ if (np) {
+ err = tegra_emc_load_timings_from_dt(emc, np);
+ of_node_put(np);
+ if (err)
+ return err;
+ }
+
err = devm_request_irq(&pdev->dev, irq, tegra_emc_isr, 0,
dev_name(&pdev->dev), emc);
if (err) {
--
2.32.0
^ permalink raw reply related [flat|nested] 6+ messages in thread