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