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linux-next/drivers/memory/of_memory.c

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memory: emif: add device tree support to emif driver Device tree support for the EMIF driver. LPDDR2 generic timings extraction from device is managed using couple of helper functions which can be used by other memory controller drivers. Reviewed-by: Benoit Cousson <b-cousson@ti.com> Reviewed-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Aneesh V <aneesh@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-17 16:35:15 +08:00
/*
* 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>
fix:memory:of_memory:add missing header dependencies We get 2 warnings when biuld kernel with W=1: drivers/memory/of_memory.c:30:30: warning: no previous prototype for 'of_get_min_tck' [-Wmissing-prototypes] drivers/memory/of_memory.c:106:30: warning: no previous prototype for 'of_get_ddr_timings' [-Wmissing-prototypes] In fact, these functions are declared in drivers/memory/of_memory.h so this patch add missing header dependencies. Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-08-28 01:31:28 +08:00
#include "of_memory.h"
memory: emif: add device tree support to emif driver Device tree support for the EMIF driver. LPDDR2 generic timings extraction from device is managed using couple of helper functions which can be used by other memory controller drivers. Reviewed-by: Benoit Cousson <b-cousson@ti.com> Reviewed-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Aneesh V <aneesh@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-17 16:35:15 +08:00
/**
* 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;
}
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;
memory: of_memory: Silence uninitialized variable warning Presumably we never use the default: case statement which prints a warning message. But my static checker complains that if we do, we will hit an uninitialized variable warning. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-04-15 22:50:32 +08:00
char *tim_compat = NULL;
memory: emif: add device tree support to emif driver Device tree support for the EMIF driver. LPDDR2 generic timings extraction from device is managed using couple of helper functions which can be used by other memory controller drivers. Reviewed-by: Benoit Cousson <b-cousson@ti.com> Reviewed-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Aneesh V <aneesh@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-17 16:35:15 +08:00
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)
treewide: devm_kzalloc() -> devm_kcalloc() The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc(). This patch replaces cases of: devm_kzalloc(handle, a * b, gfp) with: devm_kcalloc(handle, a * b, gfp) as well as handling cases of: devm_kzalloc(handle, a * b * c, gfp) with: devm_kzalloc(handle, array3_size(a, b, c), gfp) as it's slightly less ugly than: devm_kcalloc(handle, array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: devm_kzalloc(handle, 4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. Some manual whitespace fixes were needed in this patch, as Coccinelle really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...". The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ expression HANDLE; type TYPE; expression THING, E; @@ ( devm_kzalloc(HANDLE, - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | devm_kzalloc(HANDLE, - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression HANDLE; expression COUNT; typedef u8; typedef __u8; @@ ( devm_kzalloc(HANDLE, - sizeof(u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ expression HANDLE; type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ expression HANDLE; identifier SIZE, COUNT; @@ - devm_kzalloc + devm_kcalloc (HANDLE, - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression HANDLE; expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression HANDLE; expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ expression HANDLE; identifier STRIDE, SIZE, COUNT; @@ ( devm_kzalloc(HANDLE, - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression HANDLE; expression E1, E2, E3; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression HANDLE; expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, sizeof(THING) * C2, ...) | devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...) | devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, C1 * C2, ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * E2 + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * (E2) + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-13 05:07:58 +08:00
timings = devm_kcalloc(dev, arr_sz, sizeof(*timings),
GFP_KERNEL);
memory: emif: add device tree support to emif driver Device tree support for the EMIF driver. LPDDR2 generic timings extraction from device is managed using couple of helper functions which can be used by other memory controller drivers. Reviewed-by: Benoit Cousson <b-cousson@ti.com> Reviewed-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Aneesh V <aneesh@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-17 16:35:15 +08:00
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;
}
EXPORT_SYMBOL(of_get_ddr_timings);
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