cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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of_memory.c (12651B)


      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * OpenFirmware helpers for memory drivers
      4 *
      5 * Copyright (C) 2012 Texas Instruments, Inc.
      6 * Copyright (C) 2019 Samsung Electronics Co., Ltd.
      7 * Copyright (C) 2020 Krzysztof Kozlowski <krzk@kernel.org>
      8 */
      9
     10#include <linux/device.h>
     11#include <linux/of.h>
     12#include <linux/gfp.h>
     13#include <linux/export.h>
     14
     15#include "jedec_ddr.h"
     16#include "of_memory.h"
     17
     18/**
     19 * of_get_min_tck() - extract min timing values for ddr
     20 * @np: pointer to ddr device tree node
     21 * @dev: device requesting for min timing values
     22 *
     23 * Populates the lpddr2_min_tck structure by extracting data
     24 * from device tree node. Returns a pointer to the populated
     25 * structure. If any error in populating the structure, returns
     26 * default min timings provided by JEDEC.
     27 */
     28const struct lpddr2_min_tck *of_get_min_tck(struct device_node *np,
     29					    struct device *dev)
     30{
     31	int			ret = 0;
     32	struct lpddr2_min_tck	*min;
     33
     34	min = devm_kzalloc(dev, sizeof(*min), GFP_KERNEL);
     35	if (!min)
     36		goto default_min_tck;
     37
     38	ret |= of_property_read_u32(np, "tRPab-min-tck", &min->tRPab);
     39	ret |= of_property_read_u32(np, "tRCD-min-tck", &min->tRCD);
     40	ret |= of_property_read_u32(np, "tWR-min-tck", &min->tWR);
     41	ret |= of_property_read_u32(np, "tRASmin-min-tck", &min->tRASmin);
     42	ret |= of_property_read_u32(np, "tRRD-min-tck", &min->tRRD);
     43	ret |= of_property_read_u32(np, "tWTR-min-tck", &min->tWTR);
     44	ret |= of_property_read_u32(np, "tXP-min-tck", &min->tXP);
     45	ret |= of_property_read_u32(np, "tRTP-min-tck", &min->tRTP);
     46	ret |= of_property_read_u32(np, "tCKE-min-tck", &min->tCKE);
     47	ret |= of_property_read_u32(np, "tCKESR-min-tck", &min->tCKESR);
     48	ret |= of_property_read_u32(np, "tFAW-min-tck", &min->tFAW);
     49
     50	if (ret) {
     51		devm_kfree(dev, min);
     52		goto default_min_tck;
     53	}
     54
     55	return min;
     56
     57default_min_tck:
     58	dev_warn(dev, "Using default min-tck values\n");
     59	return &lpddr2_jedec_min_tck;
     60}
     61EXPORT_SYMBOL(of_get_min_tck);
     62
     63static int of_do_get_timings(struct device_node *np,
     64			     struct lpddr2_timings *tim)
     65{
     66	int ret;
     67
     68	ret = of_property_read_u32(np, "max-freq", &tim->max_freq);
     69	ret |= of_property_read_u32(np, "min-freq", &tim->min_freq);
     70	ret |= of_property_read_u32(np, "tRPab", &tim->tRPab);
     71	ret |= of_property_read_u32(np, "tRCD", &tim->tRCD);
     72	ret |= of_property_read_u32(np, "tWR", &tim->tWR);
     73	ret |= of_property_read_u32(np, "tRAS-min", &tim->tRAS_min);
     74	ret |= of_property_read_u32(np, "tRRD", &tim->tRRD);
     75	ret |= of_property_read_u32(np, "tWTR", &tim->tWTR);
     76	ret |= of_property_read_u32(np, "tXP", &tim->tXP);
     77	ret |= of_property_read_u32(np, "tRTP", &tim->tRTP);
     78	ret |= of_property_read_u32(np, "tCKESR", &tim->tCKESR);
     79	ret |= of_property_read_u32(np, "tDQSCK-max", &tim->tDQSCK_max);
     80	ret |= of_property_read_u32(np, "tFAW", &tim->tFAW);
     81	ret |= of_property_read_u32(np, "tZQCS", &tim->tZQCS);
     82	ret |= of_property_read_u32(np, "tZQCL", &tim->tZQCL);
     83	ret |= of_property_read_u32(np, "tZQinit", &tim->tZQinit);
     84	ret |= of_property_read_u32(np, "tRAS-max-ns", &tim->tRAS_max_ns);
     85	ret |= of_property_read_u32(np, "tDQSCK-max-derated",
     86				    &tim->tDQSCK_max_derated);
     87
     88	return ret;
     89}
     90
     91/**
     92 * of_get_ddr_timings() - extracts the ddr timings and updates no of
     93 * frequencies available.
     94 * @np_ddr: Pointer to ddr device tree node
     95 * @dev: Device requesting for ddr timings
     96 * @device_type: Type of ddr(LPDDR2 S2/S4)
     97 * @nr_frequencies: No of frequencies available for ddr
     98 * (updated by this function)
     99 *
    100 * Populates lpddr2_timings structure by extracting data from device
    101 * tree node. Returns pointer to populated structure. If any error
    102 * while populating, returns default timings provided by JEDEC.
    103 */
    104const struct lpddr2_timings *of_get_ddr_timings(struct device_node *np_ddr,
    105						struct device *dev,
    106						u32 device_type,
    107						u32 *nr_frequencies)
    108{
    109	struct lpddr2_timings	*timings = NULL;
    110	u32			arr_sz = 0, i = 0;
    111	struct device_node	*np_tim;
    112	char			*tim_compat = NULL;
    113
    114	switch (device_type) {
    115	case DDR_TYPE_LPDDR2_S2:
    116	case DDR_TYPE_LPDDR2_S4:
    117		tim_compat = "jedec,lpddr2-timings";
    118		break;
    119	default:
    120		dev_warn(dev, "Unsupported memory type\n");
    121	}
    122
    123	for_each_child_of_node(np_ddr, np_tim)
    124		if (of_device_is_compatible(np_tim, tim_compat))
    125			arr_sz++;
    126
    127	if (arr_sz)
    128		timings = devm_kcalloc(dev, arr_sz, sizeof(*timings),
    129				       GFP_KERNEL);
    130
    131	if (!timings)
    132		goto default_timings;
    133
    134	for_each_child_of_node(np_ddr, np_tim) {
    135		if (of_device_is_compatible(np_tim, tim_compat)) {
    136			if (of_do_get_timings(np_tim, &timings[i])) {
    137				devm_kfree(dev, timings);
    138				goto default_timings;
    139			}
    140			i++;
    141		}
    142	}
    143
    144	*nr_frequencies = arr_sz;
    145
    146	return timings;
    147
    148default_timings:
    149	dev_warn(dev, "Using default memory timings\n");
    150	*nr_frequencies = ARRAY_SIZE(lpddr2_jedec_timings);
    151	return lpddr2_jedec_timings;
    152}
    153EXPORT_SYMBOL(of_get_ddr_timings);
    154
    155/**
    156 * of_lpddr3_get_min_tck() - extract min timing values for lpddr3
    157 * @np: pointer to ddr device tree node
    158 * @dev: device requesting for min timing values
    159 *
    160 * Populates the lpddr3_min_tck structure by extracting data
    161 * from device tree node. Returns a pointer to the populated
    162 * structure. If any error in populating the structure, returns NULL.
    163 */
    164const struct lpddr3_min_tck *of_lpddr3_get_min_tck(struct device_node *np,
    165						   struct device *dev)
    166{
    167	int			ret = 0;
    168	struct lpddr3_min_tck	*min;
    169
    170	min = devm_kzalloc(dev, sizeof(*min), GFP_KERNEL);
    171	if (!min)
    172		goto default_min_tck;
    173
    174	ret |= of_property_read_u32(np, "tRFC-min-tck", &min->tRFC);
    175	ret |= of_property_read_u32(np, "tRRD-min-tck", &min->tRRD);
    176	ret |= of_property_read_u32(np, "tRPab-min-tck", &min->tRPab);
    177	ret |= of_property_read_u32(np, "tRPpb-min-tck", &min->tRPpb);
    178	ret |= of_property_read_u32(np, "tRCD-min-tck", &min->tRCD);
    179	ret |= of_property_read_u32(np, "tRC-min-tck", &min->tRC);
    180	ret |= of_property_read_u32(np, "tRAS-min-tck", &min->tRAS);
    181	ret |= of_property_read_u32(np, "tWTR-min-tck", &min->tWTR);
    182	ret |= of_property_read_u32(np, "tWR-min-tck", &min->tWR);
    183	ret |= of_property_read_u32(np, "tRTP-min-tck", &min->tRTP);
    184	ret |= of_property_read_u32(np, "tW2W-C2C-min-tck", &min->tW2W_C2C);
    185	ret |= of_property_read_u32(np, "tR2R-C2C-min-tck", &min->tR2R_C2C);
    186	ret |= of_property_read_u32(np, "tWL-min-tck", &min->tWL);
    187	ret |= of_property_read_u32(np, "tDQSCK-min-tck", &min->tDQSCK);
    188	ret |= of_property_read_u32(np, "tRL-min-tck", &min->tRL);
    189	ret |= of_property_read_u32(np, "tFAW-min-tck", &min->tFAW);
    190	ret |= of_property_read_u32(np, "tXSR-min-tck", &min->tXSR);
    191	ret |= of_property_read_u32(np, "tXP-min-tck", &min->tXP);
    192	ret |= of_property_read_u32(np, "tCKE-min-tck", &min->tCKE);
    193	ret |= of_property_read_u32(np, "tCKESR-min-tck", &min->tCKESR);
    194	ret |= of_property_read_u32(np, "tMRD-min-tck", &min->tMRD);
    195
    196	if (ret) {
    197		dev_warn(dev, "Errors while parsing min-tck values\n");
    198		devm_kfree(dev, min);
    199		goto default_min_tck;
    200	}
    201
    202	return min;
    203
    204default_min_tck:
    205	dev_warn(dev, "Using default min-tck values\n");
    206	return NULL;
    207}
    208EXPORT_SYMBOL(of_lpddr3_get_min_tck);
    209
    210static int of_lpddr3_do_get_timings(struct device_node *np,
    211				    struct lpddr3_timings *tim)
    212{
    213	int ret;
    214
    215	ret = of_property_read_u32(np, "max-freq", &tim->max_freq);
    216	if (ret)
    217		/* Deprecated way of passing max-freq as 'reg' */
    218		ret = of_property_read_u32(np, "reg", &tim->max_freq);
    219	ret |= of_property_read_u32(np, "min-freq", &tim->min_freq);
    220	ret |= of_property_read_u32(np, "tRFC", &tim->tRFC);
    221	ret |= of_property_read_u32(np, "tRRD", &tim->tRRD);
    222	ret |= of_property_read_u32(np, "tRPab", &tim->tRPab);
    223	ret |= of_property_read_u32(np, "tRPpb", &tim->tRPpb);
    224	ret |= of_property_read_u32(np, "tRCD", &tim->tRCD);
    225	ret |= of_property_read_u32(np, "tRC", &tim->tRC);
    226	ret |= of_property_read_u32(np, "tRAS", &tim->tRAS);
    227	ret |= of_property_read_u32(np, "tWTR", &tim->tWTR);
    228	ret |= of_property_read_u32(np, "tWR", &tim->tWR);
    229	ret |= of_property_read_u32(np, "tRTP", &tim->tRTP);
    230	ret |= of_property_read_u32(np, "tW2W-C2C", &tim->tW2W_C2C);
    231	ret |= of_property_read_u32(np, "tR2R-C2C", &tim->tR2R_C2C);
    232	ret |= of_property_read_u32(np, "tFAW", &tim->tFAW);
    233	ret |= of_property_read_u32(np, "tXSR", &tim->tXSR);
    234	ret |= of_property_read_u32(np, "tXP", &tim->tXP);
    235	ret |= of_property_read_u32(np, "tCKE", &tim->tCKE);
    236	ret |= of_property_read_u32(np, "tCKESR", &tim->tCKESR);
    237	ret |= of_property_read_u32(np, "tMRD", &tim->tMRD);
    238
    239	return ret;
    240}
    241
    242/**
    243 * of_lpddr3_get_ddr_timings() - extracts the lpddr3 timings and updates no of
    244 * frequencies available.
    245 * @np_ddr: Pointer to ddr device tree node
    246 * @dev: Device requesting for ddr timings
    247 * @device_type: Type of ddr
    248 * @nr_frequencies: No of frequencies available for ddr
    249 * (updated by this function)
    250 *
    251 * Populates lpddr3_timings structure by extracting data from device
    252 * tree node. Returns pointer to populated structure. If any error
    253 * while populating, returns NULL.
    254 */
    255const struct lpddr3_timings
    256*of_lpddr3_get_ddr_timings(struct device_node *np_ddr, struct device *dev,
    257			   u32 device_type, u32 *nr_frequencies)
    258{
    259	struct lpddr3_timings	*timings = NULL;
    260	u32			arr_sz = 0, i = 0;
    261	struct device_node	*np_tim;
    262	char			*tim_compat = NULL;
    263
    264	switch (device_type) {
    265	case DDR_TYPE_LPDDR3:
    266		tim_compat = "jedec,lpddr3-timings";
    267		break;
    268	default:
    269		dev_warn(dev, "Unsupported memory type\n");
    270	}
    271
    272	for_each_child_of_node(np_ddr, np_tim)
    273		if (of_device_is_compatible(np_tim, tim_compat))
    274			arr_sz++;
    275
    276	if (arr_sz)
    277		timings = devm_kcalloc(dev, arr_sz, sizeof(*timings),
    278				       GFP_KERNEL);
    279
    280	if (!timings)
    281		goto default_timings;
    282
    283	for_each_child_of_node(np_ddr, np_tim) {
    284		if (of_device_is_compatible(np_tim, tim_compat)) {
    285			if (of_lpddr3_do_get_timings(np_tim, &timings[i])) {
    286				devm_kfree(dev, timings);
    287				goto default_timings;
    288			}
    289			i++;
    290		}
    291	}
    292
    293	*nr_frequencies = arr_sz;
    294
    295	return timings;
    296
    297default_timings:
    298	dev_warn(dev, "Failed to get timings\n");
    299	*nr_frequencies = 0;
    300	return NULL;
    301}
    302EXPORT_SYMBOL(of_lpddr3_get_ddr_timings);
    303
    304/**
    305 * of_lpddr2_get_info() - extracts information about the lpddr2 chip.
    306 * @np: Pointer to device tree node containing lpddr2 info
    307 * @dev: Device requesting info
    308 *
    309 * Populates lpddr2_info structure by extracting data from device
    310 * tree node. Returns pointer to populated structure. If error
    311 * happened while populating, returns NULL. If property is missing
    312 * in a device-tree, then the corresponding value is set to -ENOENT.
    313 */
    314const struct lpddr2_info
    315*of_lpddr2_get_info(struct device_node *np, struct device *dev)
    316{
    317	struct lpddr2_info *ret_info, info = {};
    318	struct property *prop;
    319	const char *cp;
    320	int err;
    321	u32 revision_id[2];
    322
    323	err = of_property_read_u32_array(np, "revision-id", revision_id, 2);
    324	if (!err) {
    325		info.revision_id1 = revision_id[0];
    326		info.revision_id2 = revision_id[1];
    327	} else {
    328		err = of_property_read_u32(np, "revision-id1", &info.revision_id1);
    329		if (err)
    330			info.revision_id1 = -ENOENT;
    331
    332		err = of_property_read_u32(np, "revision-id2", &info.revision_id2);
    333		if (err)
    334			info.revision_id2 = -ENOENT;
    335	}
    336
    337	err = of_property_read_u32(np, "io-width", &info.io_width);
    338	if (err)
    339		return NULL;
    340
    341	info.io_width = 32 / info.io_width - 1;
    342
    343	err = of_property_read_u32(np, "density", &info.density);
    344	if (err)
    345		return NULL;
    346
    347	info.density = ffs(info.density) - 7;
    348
    349	if (of_device_is_compatible(np, "jedec,lpddr2-s4"))
    350		info.arch_type = LPDDR2_TYPE_S4;
    351	else if (of_device_is_compatible(np, "jedec,lpddr2-s2"))
    352		info.arch_type = LPDDR2_TYPE_S2;
    353	else if (of_device_is_compatible(np, "jedec,lpddr2-nvm"))
    354		info.arch_type = LPDDR2_TYPE_NVM;
    355	else
    356		return NULL;
    357
    358	prop = of_find_property(np, "compatible", NULL);
    359	for (cp = of_prop_next_string(prop, NULL); cp;
    360	     cp = of_prop_next_string(prop, cp)) {
    361
    362#define OF_LPDDR2_VENDOR_CMP(compat, ID) \
    363		if (!of_compat_cmp(cp, compat ",", strlen(compat ","))) { \
    364			info.manufacturer_id = LPDDR2_MANID_##ID; \
    365			break; \
    366		}
    367
    368		OF_LPDDR2_VENDOR_CMP("samsung", SAMSUNG)
    369		OF_LPDDR2_VENDOR_CMP("qimonda", QIMONDA)
    370		OF_LPDDR2_VENDOR_CMP("elpida", ELPIDA)
    371		OF_LPDDR2_VENDOR_CMP("etron", ETRON)
    372		OF_LPDDR2_VENDOR_CMP("nanya", NANYA)
    373		OF_LPDDR2_VENDOR_CMP("hynix", HYNIX)
    374		OF_LPDDR2_VENDOR_CMP("mosel", MOSEL)
    375		OF_LPDDR2_VENDOR_CMP("winbond", WINBOND)
    376		OF_LPDDR2_VENDOR_CMP("esmt", ESMT)
    377		OF_LPDDR2_VENDOR_CMP("spansion", SPANSION)
    378		OF_LPDDR2_VENDOR_CMP("sst", SST)
    379		OF_LPDDR2_VENDOR_CMP("zmos", ZMOS)
    380		OF_LPDDR2_VENDOR_CMP("intel", INTEL)
    381		OF_LPDDR2_VENDOR_CMP("numonyx", NUMONYX)
    382		OF_LPDDR2_VENDOR_CMP("micron", MICRON)
    383
    384#undef OF_LPDDR2_VENDOR_CMP
    385	}
    386
    387	if (!info.manufacturer_id)
    388		info.manufacturer_id = -ENOENT;
    389
    390	ret_info = devm_kzalloc(dev, sizeof(*ret_info), GFP_KERNEL);
    391	if (ret_info)
    392		*ret_info = info;
    393
    394	return ret_info;
    395}
    396EXPORT_SYMBOL(of_lpddr2_get_info);