Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399// 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 <krzk@kernel.org> */
#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);