[PATCH V3 12/18] ARM: OMAP2+: Add additional GPMC timing parameters
Jon Hunter
jon-hunter at ti.com
Sat Mar 16 02:21:10 EST 2013
Some of the GPMC timings parameters are currently missing from the GPMC
device-tree binding. Add these parameters to the binding documentation
as well as code to read them.
The existing code in gpmc_read_timings_dt() is checking the value of
of_property_read_u32() and only is successful storing the value read
in the gpmc_timings structure. Checking the return value in this case
is not necessary and we can simply read the value, if present, and
store directly in the gpmc_timings structure. Therefore, simplify the
code by removing these checks.
The comment in the gpmc_read_timings_dt() function, "only for OMAP3430"
is also incorrect as it is applicable to all OMAP3+ devices. So correct
this too.
Signed-off-by: Jon Hunter <jon-hunter at ti.com>
---
Documentation/devicetree/bindings/bus/ti-gpmc.txt | 25 +++++-
arch/arm/mach-omap2/gpmc.c | 93 ++++++++++-----------
2 files changed, 66 insertions(+), 52 deletions(-)
diff --git a/Documentation/devicetree/bindings/bus/ti-gpmc.txt b/Documentation/devicetree/bindings/bus/ti-gpmc.txt
index 6fde1cf..a63bd93 100644
--- a/Documentation/devicetree/bindings/bus/ti-gpmc.txt
+++ b/Documentation/devicetree/bindings/bus/ti-gpmc.txt
@@ -56,10 +56,27 @@ Timing properties for child nodes. All are optional and default to 0.
- gpmc,oe-off: Deassertion time
Access time and cycle time timings corresponding to GPMC_CONFIG5:
- - gpmc,page-burst-access: Multiple access word delay
- - gpmc,access: Start-cycle to first data valid delay
- - gpmc,rd-cycle: Total read cycle time
- - gpmc,wr-cycle: Total write cycle time
+ - gpmc,page-burst-access: Multiple access word delay
+ - gpmc,access: Start-cycle to first data valid delay
+ - gpmc,rd-cycle: Total read cycle time
+ - gpmc,wr-cycle: Total write cycle time
+ - gpmc,bus-turnaround: Turn-around time between successive accesses
+ - gpmc,cycle2cycle-delay: Delay between chip-select pulses
+ - gpmc,clk-activation: GPMC clock activation time
+ - gpmc,wait-monitoring: Start of wait monitoring with regard to valid
+ data
+
+Boolean timing parameters. If property is present parameter enabled and
+disabled if omitted:
+ - gpmc,adv-extra-delay: ADV signal is delayed by half GPMC clock
+ - gpmc,cs-extra-delay: CS signal is delayed by half GPMC clock
+ - gpmc,cycle2cycle-diffcsen: Add "cycle2cycle-delay" between successive
+ accesses to a different CS
+ - gpmc,cycle2cycle-samecsen: Add "cycle2cycle-delay" between successive
+ accesses to the same CS
+ - gpmc,oe-extra-delay: OE signal is delayed by half GPMC clock
+ - gpmc,we-extra-delay: WE signal is delayed by half GPMC clock
+ - gpmc,time-para-granularity: Multiply all access times by 2
The following are only applicable to OMAP3+ and AM335x:
- gpmc,wr-access
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 85b1a35..c928a8c 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -1274,67 +1274,64 @@ void gpmc_read_settings_dt(struct device_node *np, struct gpmc_settings *p)
static void __maybe_unused gpmc_read_timings_dt(struct device_node *np,
struct gpmc_timings *gpmc_t)
{
- u32 val;
-
memset(gpmc_t, 0, sizeof(*gpmc_t));
/* minimum clock period for syncronous mode */
- if (!of_property_read_u32(np, "gpmc,sync-clk", &val))
- gpmc_t->sync_clk = val;
+ of_property_read_u32(np, "gpmc,sync-clk", &gpmc_t->sync_clk);
/* chip select timtings */
- if (!of_property_read_u32(np, "gpmc,cs-on", &val))
- gpmc_t->cs_on = val;
-
- if (!of_property_read_u32(np, "gpmc,cs-rd-off", &val))
- gpmc_t->cs_rd_off = val;
-
- if (!of_property_read_u32(np, "gpmc,cs-wr-off", &val))
- gpmc_t->cs_wr_off = val;
+ of_property_read_u32(np, "gpmc,cs-on", &gpmc_t->cs_on);
+ of_property_read_u32(np, "gpmc,cs-rd-off", &gpmc_t->cs_rd_off);
+ of_property_read_u32(np, "gpmc,cs-wr-off", &gpmc_t->cs_wr_off);
/* ADV signal timings */
- if (!of_property_read_u32(np, "gpmc,adv-on", &val))
- gpmc_t->adv_on = val;
-
- if (!of_property_read_u32(np, "gpmc,adv-rd-off", &val))
- gpmc_t->adv_rd_off = val;
-
- if (!of_property_read_u32(np, "gpmc,adv-wr-off", &val))
- gpmc_t->adv_wr_off = val;
+ of_property_read_u32(np, "gpmc,adv-on", &gpmc_t->adv_on);
+ of_property_read_u32(np, "gpmc,adv-rd-off", &gpmc_t->adv_rd_off);
+ of_property_read_u32(np, "gpmc,adv-wr-off", &gpmc_t->adv_wr_off);
/* WE signal timings */
- if (!of_property_read_u32(np, "gpmc,we-on", &val))
- gpmc_t->we_on = val;
-
- if (!of_property_read_u32(np, "gpmc,we-off", &val))
- gpmc_t->we_off = val;
+ of_property_read_u32(np, "gpmc,we-on", &gpmc_t->we_on);
+ of_property_read_u32(np, "gpmc,we-off", &gpmc_t->we_off);
/* OE signal timings */
- if (!of_property_read_u32(np, "gpmc,oe-on", &val))
- gpmc_t->oe_on = val;
-
- if (!of_property_read_u32(np, "gpmc,oe-off", &val))
- gpmc_t->oe_off = val;
+ of_property_read_u32(np, "gpmc,oe-on", &gpmc_t->oe_on);
+ of_property_read_u32(np, "gpmc,oe-off", &gpmc_t->oe_off);
/* access and cycle timings */
- if (!of_property_read_u32(np, "gpmc,page-burst-access", &val))
- gpmc_t->page_burst_access = val;
-
- if (!of_property_read_u32(np, "gpmc,access", &val))
- gpmc_t->access = val;
-
- if (!of_property_read_u32(np, "gpmc,rd-cycle", &val))
- gpmc_t->rd_cycle = val;
-
- if (!of_property_read_u32(np, "gpmc,wr-cycle", &val))
- gpmc_t->wr_cycle = val;
-
- /* only for OMAP3430 */
- if (!of_property_read_u32(np, "gpmc,wr-access", &val))
- gpmc_t->wr_access = val;
-
- if (!of_property_read_u32(np, "gpmc,wr-data-mux-bus", &val))
- gpmc_t->wr_data_mux_bus = val;
+ of_property_read_u32(np, "gpmc,page-burst-access",
+ &gpmc_t->page_burst_access);
+ of_property_read_u32(np, "gpmc,access", &gpmc_t->access);
+ of_property_read_u32(np, "gpmc,rd-cycle", &gpmc_t->rd_cycle);
+ of_property_read_u32(np, "gpmc,wr-cycle", &gpmc_t->wr_cycle);
+ of_property_read_u32(np, "gpmc,bus-turnaround",
+ &gpmc_t->bus_turnaround);
+ of_property_read_u32(np, "gpmc,cycle2cycle-delay",
+ &gpmc_t->cycle2cycle_delay);
+ of_property_read_u32(np, "gpmc,wait-monitoring",
+ &gpmc_t->wait_monitoring);
+ of_property_read_u32(np, "gpmc,clk-activation",
+ &gpmc_t->clk_activation);
+
+ /* only applicable to OMAP3+ */
+ of_property_read_u32(np, "gpmc,wr-access", &gpmc_t->wr_access);
+ of_property_read_u32(np, "gpmc,wr-data-mux-bus",
+ &gpmc_t->wr_data_mux_bus);
+
+ /* bool timing parameters */
+ if (of_find_property(np, "gpmc,cycle2cycle-diffcsen", NULL))
+ gpmc_t->bool_timings.cycle2cyclediffcsen = true;
+ if (of_find_property(np, "gpmc,cycle2cycle-samecsen", NULL))
+ gpmc_t->bool_timings.cycle2cyclesamecsen = true;
+ if (of_find_property(np, "gpmc,we-extra-delay", NULL))
+ gpmc_t->bool_timings.we_extra_delay = true;
+ if (of_find_property(np, "gpmc,oe-extra-delay", NULL))
+ gpmc_t->bool_timings.oe_extra_delay = true;
+ if (of_find_property(np, "gpmc,adv-extra-delay", NULL))
+ gpmc_t->bool_timings.adv_extra_delay = true;
+ if (of_find_property(np, "gpmc,cs-extra-delay", NULL))
+ gpmc_t->bool_timings.cs_extra_delay = true;
+ if (of_find_property(np, "gpmc,time-para-granularity", NULL))
+ gpmc_t->bool_timings.time_para_granularity = true;
}
#ifdef CONFIG_MTD_NAND
--
1.7.10.4
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