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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 2021-10-07 01:46:58 +03:00 committed by Krzysztof Kozlowski
parent ce004ae6c5
commit 38322cf423
4 changed files with 184 additions and 0 deletions
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47
drivers/memory/jedec_ddr.h
View File

@ -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 +190,33 @@ 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 standard mode register bitfields or set to
* -ENOENT 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

41
drivers/memory/jedec_ddr_data.c
View File

@ -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);

87
drivers/memory/of_memory.c
View File

@ -298,3 +298,90 @@ default_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_VENDOR_CMP(compat, ID) \
if (!of_compat_cmp(cp, compat ",", strlen(compat ","))) { \
info.manufacturer_id = LPDDR2_MANID_##ID; \
break; \
}
OF_LPDDR2_VENDOR_CMP("samsung", SAMSUNG)
OF_LPDDR2_VENDOR_CMP("qimonda", QIMONDA)
OF_LPDDR2_VENDOR_CMP("elpida", ELPIDA)
OF_LPDDR2_VENDOR_CMP("etron", ETRON)
OF_LPDDR2_VENDOR_CMP("nanya", NANYA)
OF_LPDDR2_VENDOR_CMP("hynix", HYNIX)
OF_LPDDR2_VENDOR_CMP("mosel", MOSEL)
OF_LPDDR2_VENDOR_CMP("winbond", WINBOND)
OF_LPDDR2_VENDOR_CMP("esmt", ESMT)
OF_LPDDR2_VENDOR_CMP("spansion", SPANSION)
OF_LPDDR2_VENDOR_CMP("sst", SST)
OF_LPDDR2_VENDOR_CMP("zmos", ZMOS)
OF_LPDDR2_VENDOR_CMP("intel", INTEL)
OF_LPDDR2_VENDOR_CMP("numonyx", NUMONYX)
OF_LPDDR2_VENDOR_CMP("micron", MICRON)
#undef OF_LPDDR2_VENDOR_CMP
}
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);

9
drivers/memory/of_memory.h
View File

@ -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_ */