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mtd: nand: Add a few more timings to nand_sdr_timings

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Add the tR_max, tBERS_max, tPROG_max and tCCS_min timings to the
nand_sdr_timings struct.
Assign default/safe values for the statically defined timings, and
extract them from the ONFI parameter table if the NAND is ONFI
compliant.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
[Linux commit: 204e7ecd47e26cc12d9e8e8a7e7a2eeb9573f0ba
 Fixup commit: 6d29231000bbe0fb9e4893a9c68151ffdd3b5469]
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Boris Brezillon 2017-11-22 02:38:21 +09:00 committed by Masahiro Yamada
parent 3d841b3214
commit 6f84b26b53
2 changed files with 33 additions and 1 deletions
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26
drivers/mtd/nand/nand_timings.c
View File

@ -17,6 +17,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
{
.type = NAND_SDR_IFACE,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tADL_min = 400000,
.tALH_min = 20000,
.tALS_min = 50000,
@ -57,6 +59,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
{
.type = NAND_SDR_IFACE,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tADL_min = 400000,
.tALH_min = 10000,
.tALS_min = 25000,
@ -97,6 +101,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
{
.type = NAND_SDR_IFACE,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tADL_min = 400000,
.tALH_min = 10000,
.tALS_min = 15000,
@ -137,6 +143,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
{
.type = NAND_SDR_IFACE,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tADL_min = 400000,
.tALH_min = 5000,
.tALS_min = 10000,
@ -177,6 +185,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
{
.type = NAND_SDR_IFACE,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tADL_min = 400000,
.tALH_min = 5000,
.tALS_min = 10000,
@ -217,6 +227,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
{
.type = NAND_SDR_IFACE,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tADL_min = 400000,
.tALH_min = 5000,
.tALS_min = 10000,
@ -289,10 +301,22 @@ int onfi_init_data_interface(struct nand_chip *chip,
*iface = onfi_sdr_timings[timing_mode];
/*
* TODO: initialize timings that cannot be deduced from timing mode:
* Initialize timings that cannot be deduced from timing mode:
* tR, tPROG, tCCS, ...
* These information are part of the ONFI parameter page.
*/
if (chip->onfi_version) {
struct nand_onfi_params *params = &chip->onfi_params;
struct nand_sdr_timings *timings = &iface->timings.sdr;
/* microseconds -> picoseconds */
timings->tPROG_max = 1000000ULL * le16_to_cpu(params->t_prog);
timings->tBERS_max = 1000000ULL * le16_to_cpu(params->t_bers);
timings->tR_max = 1000000ULL * le16_to_cpu(params->t_r);
/* nanoseconds -> picoseconds */
timings->tCCS_min = 1000UL * le16_to_cpu(params->t_ccs);
}
return 0;
}

8
include/linux/mtd/nand.h
View File

@ -595,6 +595,10 @@ struct nand_buffers {
*
* All these timings are expressed in picoseconds.
*
* @tBERS_max: Block erase time
* @tCCS_min: Change column setup time
* @tPROG_max: Page program time
* @tR_max: Page read time
* @tALH_min: ALE hold time
* @tADL_min: ALE to data loading time
* @tALS_min: ALE setup time
@ -632,6 +636,10 @@ struct nand_buffers {
* @tWW_min: WP# transition to WE# low
*/
struct nand_sdr_timings {
u64 tBERS_max;
u32 tCCS_min;
u64 tPROG_max;
u64 tR_max;
u32 tALH_min;
u32 tADL_min;
u32 tALS_min;