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Release 4.14 drivers/memory/of_memory.c

Directory: drivers/memory
/*
 * OpenFirmware helpers for memory drivers
 *
 * Copyright (C) 2012 Texas Instruments, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/of.h>
#include <linux/gfp.h>
#include <memory/jedec_ddr.h>
#include <linux/export.h>
#include "of_memory.h"

/**
 * of_get_min_tck() - extract min timing values for ddr
 * @np: pointer to ddr device tree node
 * @device: 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, "%s: using default min-tck values\n", __func__); return &lpddr2_jedec_min_tck; }

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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; }

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/** * 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, "%s: un-supported memory type\n", __func__); } 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_kzalloc(dev, sizeof(*timings) * arr_sz, 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])) { devm_kfree(dev, timings); goto default_timings; } i++; } } *nr_frequencies = arr_sz; return timings; default_timings: dev_warn(dev, "%s: using default timings\n", __func__); *nr_frequencies = ARRAY_SIZE(lpddr2_jedec_timings); return lpddr2_jedec_timings; }

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EXPORT_SYMBOL(of_get_ddr_timings);

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Directory: drivers/memory
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