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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * OpenFirmware helpers for memory drivers
- *
- * Copyright (C) 2012 Texas Instruments, Inc.
- * Copyright (C) 2019 Samsung Electronics Co., Ltd.
- * Copyright (C) 2020 Krzysztof Kozlowski <[email protected]>
- */
- #include <linux/device.h>
- #include <linux/of.h>
- #include <linux/gfp.h>
- #include <linux/export.h>
- #include "jedec_ddr.h"
- #include "of_memory.h"
- /**
- * of_get_min_tck() - extract min timing values for ddr
- * @np: pointer to ddr device tree node
- * @dev: device requesting for min timing values
- *
- * Populates the lpddr2_min_tck structure by extracting data
- * from device tree node. Returns a pointer to the populated
- * structure. If any error in populating the structure, returns
- * default min timings provided by JEDEC.
- */
- const struct lpddr2_min_tck *of_get_min_tck(struct device_node *np,
- struct device *dev)
- {
- int ret = 0;
- struct lpddr2_min_tck *min;
- min = devm_kzalloc(dev, sizeof(*min), GFP_KERNEL);
- if (!min)
- goto default_min_tck;
- ret |= of_property_read_u32(np, "tRPab-min-tck", &min->tRPab);
- ret |= of_property_read_u32(np, "tRCD-min-tck", &min->tRCD);
- ret |= of_property_read_u32(np, "tWR-min-tck", &min->tWR);
- ret |= of_property_read_u32(np, "tRASmin-min-tck", &min->tRASmin);
- ret |= of_property_read_u32(np, "tRRD-min-tck", &min->tRRD);
- ret |= of_property_read_u32(np, "tWTR-min-tck", &min->tWTR);
- ret |= of_property_read_u32(np, "tXP-min-tck", &min->tXP);
- ret |= of_property_read_u32(np, "tRTP-min-tck", &min->tRTP);
- ret |= of_property_read_u32(np, "tCKE-min-tck", &min->tCKE);
- ret |= of_property_read_u32(np, "tCKESR-min-tck", &min->tCKESR);
- ret |= of_property_read_u32(np, "tFAW-min-tck", &min->tFAW);
- if (ret) {
- devm_kfree(dev, min);
- goto default_min_tck;
- }
- return min;
- default_min_tck:
- dev_warn(dev, "Using default min-tck values\n");
- return &lpddr2_jedec_min_tck;
- }
- EXPORT_SYMBOL(of_get_min_tck);
- static int of_do_get_timings(struct device_node *np,
- struct lpddr2_timings *tim)
- {
- int ret;
- ret = of_property_read_u32(np, "max-freq", &tim->max_freq);
- ret |= of_property_read_u32(np, "min-freq", &tim->min_freq);
- ret |= of_property_read_u32(np, "tRPab", &tim->tRPab);
- ret |= of_property_read_u32(np, "tRCD", &tim->tRCD);
- ret |= of_property_read_u32(np, "tWR", &tim->tWR);
- ret |= of_property_read_u32(np, "tRAS-min", &tim->tRAS_min);
- ret |= of_property_read_u32(np, "tRRD", &tim->tRRD);
- ret |= of_property_read_u32(np, "tWTR", &tim->tWTR);
- ret |= of_property_read_u32(np, "tXP", &tim->tXP);
- ret |= of_property_read_u32(np, "tRTP", &tim->tRTP);
- ret |= of_property_read_u32(np, "tCKESR", &tim->tCKESR);
- ret |= of_property_read_u32(np, "tDQSCK-max", &tim->tDQSCK_max);
- ret |= of_property_read_u32(np, "tFAW", &tim->tFAW);
- ret |= of_property_read_u32(np, "tZQCS", &tim->tZQCS);
- ret |= of_property_read_u32(np, "tZQCL", &tim->tZQCL);
- ret |= of_property_read_u32(np, "tZQinit", &tim->tZQinit);
- ret |= of_property_read_u32(np, "tRAS-max-ns", &tim->tRAS_max_ns);
- ret |= of_property_read_u32(np, "tDQSCK-max-derated",
- &tim->tDQSCK_max_derated);
- return ret;
- }
- /**
- * of_get_ddr_timings() - extracts the ddr timings and updates no of
- * frequencies available.
- * @np_ddr: Pointer to ddr device tree node
- * @dev: Device requesting for ddr timings
- * @device_type: Type of ddr(LPDDR2 S2/S4)
- * @nr_frequencies: No of frequencies available for ddr
- * (updated by this function)
- *
- * Populates lpddr2_timings structure by extracting data from device
- * tree node. Returns pointer to populated structure. If any error
- * while populating, returns default timings provided by JEDEC.
- */
- const struct lpddr2_timings *of_get_ddr_timings(struct device_node *np_ddr,
- struct device *dev,
- u32 device_type,
- u32 *nr_frequencies)
- {
- struct lpddr2_timings *timings = NULL;
- u32 arr_sz = 0, i = 0;
- struct device_node *np_tim;
- char *tim_compat = NULL;
- switch (device_type) {
- case DDR_TYPE_LPDDR2_S2:
- case DDR_TYPE_LPDDR2_S4:
- tim_compat = "jedec,lpddr2-timings";
- break;
- default:
- dev_warn(dev, "Unsupported memory type\n");
- }
- for_each_child_of_node(np_ddr, np_tim)
- if (of_device_is_compatible(np_tim, tim_compat))
- arr_sz++;
- if (arr_sz)
- timings = devm_kcalloc(dev, arr_sz, sizeof(*timings),
- GFP_KERNEL);
- if (!timings)
- goto default_timings;
- for_each_child_of_node(np_ddr, np_tim) {
- if (of_device_is_compatible(np_tim, tim_compat)) {
- if (of_do_get_timings(np_tim, &timings[i])) {
- of_node_put(np_tim);
- devm_kfree(dev, timings);
- goto default_timings;
- }
- i++;
- }
- }
- *nr_frequencies = arr_sz;
- return timings;
- default_timings:
- dev_warn(dev, "Using default memory timings\n");
- *nr_frequencies = ARRAY_SIZE(lpddr2_jedec_timings);
- return lpddr2_jedec_timings;
- }
- EXPORT_SYMBOL(of_get_ddr_timings);
- /**
- * of_lpddr3_get_min_tck() - extract min timing values for lpddr3
- * @np: pointer to ddr device tree node
- * @dev: device requesting for min timing values
- *
- * Populates the lpddr3_min_tck structure by extracting data
- * from device tree node. Returns a pointer to the populated
- * structure. If any error in populating the structure, returns NULL.
- */
- const struct lpddr3_min_tck *of_lpddr3_get_min_tck(struct device_node *np,
- struct device *dev)
- {
- int ret = 0;
- struct lpddr3_min_tck *min;
- min = devm_kzalloc(dev, sizeof(*min), GFP_KERNEL);
- if (!min)
- goto default_min_tck;
- ret |= of_property_read_u32(np, "tRFC-min-tck", &min->tRFC);
- ret |= of_property_read_u32(np, "tRRD-min-tck", &min->tRRD);
- ret |= of_property_read_u32(np, "tRPab-min-tck", &min->tRPab);
- ret |= of_property_read_u32(np, "tRPpb-min-tck", &min->tRPpb);
- ret |= of_property_read_u32(np, "tRCD-min-tck", &min->tRCD);
- ret |= of_property_read_u32(np, "tRC-min-tck", &min->tRC);
- ret |= of_property_read_u32(np, "tRAS-min-tck", &min->tRAS);
- ret |= of_property_read_u32(np, "tWTR-min-tck", &min->tWTR);
- ret |= of_property_read_u32(np, "tWR-min-tck", &min->tWR);
- ret |= of_property_read_u32(np, "tRTP-min-tck", &min->tRTP);
- ret |= of_property_read_u32(np, "tW2W-C2C-min-tck", &min->tW2W_C2C);
- ret |= of_property_read_u32(np, "tR2R-C2C-min-tck", &min->tR2R_C2C);
- ret |= of_property_read_u32(np, "tWL-min-tck", &min->tWL);
- ret |= of_property_read_u32(np, "tDQSCK-min-tck", &min->tDQSCK);
- ret |= of_property_read_u32(np, "tRL-min-tck", &min->tRL);
- ret |= of_property_read_u32(np, "tFAW-min-tck", &min->tFAW);
- ret |= of_property_read_u32(np, "tXSR-min-tck", &min->tXSR);
- ret |= of_property_read_u32(np, "tXP-min-tck", &min->tXP);
- ret |= of_property_read_u32(np, "tCKE-min-tck", &min->tCKE);
- ret |= of_property_read_u32(np, "tCKESR-min-tck", &min->tCKESR);
- ret |= of_property_read_u32(np, "tMRD-min-tck", &min->tMRD);
- if (ret) {
- dev_warn(dev, "Errors while parsing min-tck values\n");
- devm_kfree(dev, min);
- goto default_min_tck;
- }
- return min;
- default_min_tck:
- dev_warn(dev, "Using default min-tck values\n");
- return NULL;
- }
- EXPORT_SYMBOL(of_lpddr3_get_min_tck);
- static int of_lpddr3_do_get_timings(struct device_node *np,
- struct lpddr3_timings *tim)
- {
- int ret;
- ret = of_property_read_u32(np, "max-freq", &tim->max_freq);
- if (ret)
- /* Deprecated way of passing max-freq as 'reg' */
- ret = of_property_read_u32(np, "reg", &tim->max_freq);
- ret |= of_property_read_u32(np, "min-freq", &tim->min_freq);
- ret |= of_property_read_u32(np, "tRFC", &tim->tRFC);
- ret |= of_property_read_u32(np, "tRRD", &tim->tRRD);
- ret |= of_property_read_u32(np, "tRPab", &tim->tRPab);
- ret |= of_property_read_u32(np, "tRPpb", &tim->tRPpb);
- ret |= of_property_read_u32(np, "tRCD", &tim->tRCD);
- ret |= of_property_read_u32(np, "tRC", &tim->tRC);
- ret |= of_property_read_u32(np, "tRAS", &tim->tRAS);
- ret |= of_property_read_u32(np, "tWTR", &tim->tWTR);
- ret |= of_property_read_u32(np, "tWR", &tim->tWR);
- ret |= of_property_read_u32(np, "tRTP", &tim->tRTP);
- ret |= of_property_read_u32(np, "tW2W-C2C", &tim->tW2W_C2C);
- ret |= of_property_read_u32(np, "tR2R-C2C", &tim->tR2R_C2C);
- ret |= of_property_read_u32(np, "tFAW", &tim->tFAW);
- ret |= of_property_read_u32(np, "tXSR", &tim->tXSR);
- ret |= of_property_read_u32(np, "tXP", &tim->tXP);
- ret |= of_property_read_u32(np, "tCKE", &tim->tCKE);
- ret |= of_property_read_u32(np, "tCKESR", &tim->tCKESR);
- ret |= of_property_read_u32(np, "tMRD", &tim->tMRD);
- return ret;
- }
- /**
- * of_lpddr3_get_ddr_timings() - extracts the lpddr3 timings and updates no of
- * frequencies available.
- * @np_ddr: Pointer to ddr device tree node
- * @dev: Device requesting for ddr timings
- * @device_type: Type of ddr
- * @nr_frequencies: No of frequencies available for ddr
- * (updated by this function)
- *
- * Populates lpddr3_timings structure by extracting data from device
- * tree node. Returns pointer to populated structure. If any error
- * while populating, returns NULL.
- */
- const struct lpddr3_timings
- *of_lpddr3_get_ddr_timings(struct device_node *np_ddr, struct device *dev,
- u32 device_type, u32 *nr_frequencies)
- {
- struct lpddr3_timings *timings = NULL;
- u32 arr_sz = 0, i = 0;
- struct device_node *np_tim;
- char *tim_compat = NULL;
- switch (device_type) {
- case DDR_TYPE_LPDDR3:
- tim_compat = "jedec,lpddr3-timings";
- break;
- default:
- dev_warn(dev, "Unsupported memory type\n");
- }
- for_each_child_of_node(np_ddr, np_tim)
- if (of_device_is_compatible(np_tim, tim_compat))
- arr_sz++;
- if (arr_sz)
- timings = devm_kcalloc(dev, arr_sz, sizeof(*timings),
- GFP_KERNEL);
- if (!timings)
- goto default_timings;
- for_each_child_of_node(np_ddr, np_tim) {
- if (of_device_is_compatible(np_tim, tim_compat)) {
- if (of_lpddr3_do_get_timings(np_tim, &timings[i])) {
- devm_kfree(dev, timings);
- of_node_put(np_tim);
- goto default_timings;
- }
- i++;
- }
- }
- *nr_frequencies = arr_sz;
- return timings;
- default_timings:
- dev_warn(dev, "Failed to get timings\n");
- *nr_frequencies = 0;
- 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;
- u32 revision_id[2];
- err = of_property_read_u32_array(np, "revision-id", revision_id, 2);
- if (!err) {
- info.revision_id1 = revision_id[0];
- info.revision_id2 = revision_id[1];
- } else {
- 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);
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