From: Roger Quadros <rogerq@ti.com>
To: tony@atomide.com, dwmw2@infradead.org, computersforpeace@gmail.com
Cc: devicetree@vger.kernel.org, nsekhar@ti.com,
linux-kernel@vger.kernel.org, kyungmin.park@samsung.com,
linux-mtd@lists.infradead.org, pekon@ti.com,
ezequiel.garcia@free-electrons.com, javier@dowhile0.org,
linux-omap@vger.kernel.org, Roger Quadros <rogerq@ti.com>
Subject: [PATCH 15/36] ARM: OMAP2+: gpmc: Allow drivers to query GPMC_CLK period
Date: Wed, 11 Jun 2014 11:56:20 +0300 [thread overview]
Message-ID: <1402477001-31132-16-git-send-email-rogerq@ti.com> (raw)
In-Reply-To: <1402477001-31132-1-git-send-email-rogerq@ti.com>
GPMC_CLK is the external clock output pin that is used for syncronous
accesses.
Device drivers need to know the fastest possible GPMC_CLK period in order
to calculate the most optimal device timings. Add the function
omap_gpmc_get_clk_period() to allow drivers to get the nearset possible
(equal to or greater than) GPMC_CLK period given the minimum
clock period supported by the attached device.
This is especially needed by the onenand driver as it calculates
device timings on the fly for various onenand speed grades.
Signed-off-by: Roger Quadros <rogerq@ti.com>
---
arch/arm/mach-omap2/gpmc.c | 38 +++++++++++++++++++++++++++++++++
include/linux/platform_data/gpmc-omap.h | 8 +++++++
2 files changed, 46 insertions(+)
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 90b7686..50ef1a9 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -1578,6 +1578,44 @@ int omap_gpmc_retime(int cs, struct gpmc_settings *gpmc_s,
}
EXPORT_SYMBOL_GPL(omap_gpmc_retime);
+/**
+ * omap_gpmc_get_clk_period - Get the nearest possible (equal to or higer) GPMC
+ * synchronous clock (GPMC_CLK) period.
+ *
+ * @cs Chip select number
+ * @min_ps Minimum synchronous clock period supporded by the device
+ *
+ * Returns the nearest possible GPMC clock period in picoseconds, equal to or
+ * higher than the requested period. 0 in case of error.
+ */
+unsigned long omap_gpmc_get_clk_period(int cs,
+ unsigned long min_ps)
+{
+ int div;
+ unsigned long clk_ps;
+ struct device *dev = gpmc_dev;
+
+ if (!gpmc_dev)
+ return 0;
+
+ if (cs < 0 || cs >= gpmc_cs_num) {
+ dev_err(dev, "%s: Invalid Chip Select\n", __func__);
+ return cs;
+ }
+
+ div = gpmc_calc_divider(min_ps);
+ if (div < 0) {
+ dev_err(dev, "%s: Can't support requested clock period %lu ps\n",
+ __func__, min_ps);
+ return 0;
+ }
+
+ clk_ps = gpmc_get_fclk_period() * div;
+
+ return clk_ps;
+}
+EXPORT_SYMBOL_GPL(omap_gpmc_get_clk_period);
+
static struct omap3_gpmc_regs gpmc_context;
void omap3_gpmc_save_context(void)
diff --git a/include/linux/platform_data/gpmc-omap.h b/include/linux/platform_data/gpmc-omap.h
index 0d40c2a..05e4b6f 100644
--- a/include/linux/platform_data/gpmc-omap.h
+++ b/include/linux/platform_data/gpmc-omap.h
@@ -169,6 +169,8 @@ struct gpmc_omap_platform_data {
#ifdef CONFIG_ARCH_OMAP2PLUS
int omap_gpmc_retime(int cs, struct gpmc_settings *gpmc_s,
struct gpmc_device_timings *dev_t);
+unsigned long omap_gpmc_get_clk_period(int cs,
+ unsigned long min_ps);
#else
static inline int omap_gpmc_retime(int cs,
struct gpmc_settings *gpmc_s,
@@ -176,6 +178,12 @@ static inline int omap_gpmc_retime(int cs,
{
return 0;
}
+
+static inline unsigned long omap_gpmc_get_clk_period(int cs,
+ unsigned long min_ps)
+{
+ return 0;
+}
#endif /* CONFIG_ARCH_OMAP2PLUS */
#endif /* _GPMC_OMAP_H */
--
1.8.3.2
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next prev parent reply other threads:[~2014-06-11 8:56 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-11 8:56 [PATCH 00/36] OMAP: GPMC: Restructure and move OMAP GPMC driver out of mach-omap2 Roger Quadros
2014-06-11 8:56 ` [PATCH 01/36] ARM: OMAP3: hwmod: Fix gpmc memory resource space Roger Quadros
2014-06-13 7:13 ` Tony Lindgren
2014-06-13 7:15 ` Roger Quadros
2014-06-11 8:56 ` [PATCH 02/36] ARM: dts: OMAP2+: Fix GPMC register space size Roger Quadros
2014-06-11 8:56 ` [PATCH 03/36] ARM: OMAP2+: gpmc: Add platform data Roger Quadros
2014-06-11 8:56 ` [PATCH 04/36] ARM: OMAP2+: gpmc: Add gpmc timings and settings to " Roger Quadros
2014-06-11 8:56 ` [PATCH 05/36] mtd: nand: omap: Move IRQ handling from GPMC to NAND driver Roger Quadros
2014-06-13 7:18 ` Tony Lindgren
[not found] ` <20140613071820.GI17845-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2014-06-13 7:38 ` Roger Quadros
[not found] ` <539AAA8C.2070709-l0cyMroinI0@public.gmane.org>
2014-06-13 7:58 ` Tony Lindgren
2014-06-13 8:13 ` Gupta, Pekon
2014-06-13 8:23 ` Roger Quadros
2014-06-13 10:46 ` Tony Lindgren
[not found] ` <20140613104610.GS17845-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2014-06-13 11:42 ` Roger Quadros
[not found] ` <539AE390.4080504-l0cyMroinI0@public.gmane.org>
2014-06-13 12:08 ` Tony Lindgren
2014-07-01 10:11 ` Roger Quadros
2014-07-01 13:16 ` Tony Lindgren
2014-06-11 8:56 ` [PATCH 06/36] mtd: nand: omap: Move gpmc_update_nand_reg to nand driver Roger Quadros
[not found] ` <1402477001-31132-7-git-send-email-rogerq-l0cyMroinI0@public.gmane.org>
2014-06-13 7:19 ` Tony Lindgren
2014-06-11 8:56 ` [PATCH 07/36] mtd: nand: omap: Move NAND write protect code from GPMC to NAND driver Roger Quadros
2014-06-13 7:20 ` Tony Lindgren
2014-06-11 8:56 ` [PATCH 08/36] mtd: nand: omap: Copy platform data parameters to omap_nand_info data Roger Quadros
2014-06-11 8:56 ` [PATCH 09/36] mtd: nand: omap: Clean up device tree support Roger Quadros
2014-06-11 8:56 ` [PATCH 10/36] ARM: dts: OMAP2+: Fix NAND device nodes Roger Quadros
[not found] ` <1402477001-31132-11-git-send-email-rogerq-l0cyMroinI0@public.gmane.org>
2014-06-13 7:21 ` Tony Lindgren
2014-06-11 8:56 ` [PATCH 11/36] mtd: nand: omap: Update DT binding documentation Roger Quadros
2014-06-11 8:56 ` [PATCH 12/36] ARM: dts: omap3-beagle: Add NAND device Roger Quadros
2014-06-11 8:56 ` [PATCH 13/36] ARM: OMAP2+: gpmc.c: sanity check bank-width DT property Roger Quadros
2014-06-11 8:56 ` [PATCH 14/36] ARM: OMAP2+: gpmc: Allow drivers to reconfigure GPMC settings & timings Roger Quadros
2014-06-13 7:25 ` Tony Lindgren
2014-06-13 7:44 ` Roger Quadros
[not found] ` <539AABE5.10907-l0cyMroinI0@public.gmane.org>
2014-06-13 8:04 ` Tony Lindgren
2014-06-11 8:56 ` Roger Quadros [this message]
2014-06-13 7:26 ` [PATCH 15/36] ARM: OMAP2+: gpmc: Allow drivers to query GPMC_CLK period Tony Lindgren
2014-06-13 7:48 ` Roger Quadros
2014-06-11 8:56 ` [PATCH 16/36] mtd: onenand: omap: Remove regulator management code Roger Quadros
2014-06-11 8:56 ` [PATCH 17/36] ARM: OMAP2+: gpmc-onenand: Use Async settings/timings by default Roger Quadros
2014-06-11 8:56 ` [PATCH 18/36] ARM: OMAP2+: gpmc-onenand: Move Synchronous setting code to drivers/ Roger Quadros
[not found] ` <1402477001-31132-19-git-send-email-rogerq-l0cyMroinI0@public.gmane.org>
2014-06-13 7:55 ` Tony Lindgren
[not found] ` <20140613075527.GP17845-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2014-06-13 8:30 ` Roger Quadros
2014-06-11 8:56 ` [PATCH 19/36] mtd: onenand: omap: Use devres managed resources Roger Quadros
2014-06-11 8:56 ` [PATCH 20/36] mtd: onenand: omap: Clean up device tree support Roger Quadros
2014-06-11 8:56 ` [PATCH 21/36] ARM: dts: OMAP2+: Fix OneNAND device nodes Roger Quadros
2014-06-11 8:56 ` [PATCH 22/36] ARM: OMAP2+: gmpc: add gpmc_generic_init() Roger Quadros
2014-06-11 8:56 ` [PATCH 23/36] ARM: OMAP2+: gpmc: use platform data to configure CS space and poplulate device Roger Quadros
2014-06-11 8:56 ` [PATCH 24/36] ARM: OMAP2+: gpmc: add NAND specific setup Roger Quadros
2014-06-11 8:56 ` [PATCH 25/36] ARM: OMAP2+: gpmc: Support multiple Chip Selects per device Roger Quadros
2014-06-11 8:56 ` [PATCH 26/36] ARM: OMAP2+: gpmc-smc91x: Get rid of retime() from omap_smc91x_platform_data Roger Quadros
2014-06-11 8:56 ` [PATCH 27/36] ARM: OMAP2+: usb-tusb6010: Use omap_gpmc_retime() Roger Quadros
2014-06-11 8:56 ` [PATCH 28/36] ARM: OMAP2+: nand: Update gpmc_nand_init() to use generic_gpmc_init() Roger Quadros
2014-06-11 8:56 ` [PATCH 29/36] ARM: OMAP2+: gpmc-smc91x: Use gpmc_generic_init() Roger Quadros
2014-06-11 8:56 ` [PATCH 30/36] ARM: OMAP2+: gpmc-smsc911x: " Roger Quadros
2014-06-11 8:56 ` [PATCH 31/36] ARM: OMAP2: usb-tusb6010: " Roger Quadros
2014-06-11 8:56 ` [PATCH 32/36] ARM: OMAP2+: onenand: " Roger Quadros
2014-06-11 8:56 ` [PATCH 33/36] ARM: OMAP2+: board-flash: Use gpmc_generic_init() for NOR Roger Quadros
2014-06-11 8:56 ` [PATCH 34/36] ARM: OMAP2+: gpmc: Make externally unused functions/defines private Roger Quadros
2014-06-11 8:56 ` [PATCH 35/36] ARM: OMAP2+: gpmc: move GPMC driver into drivers/memory Roger Quadros
[not found] ` <1402477001-31132-36-git-send-email-rogerq-l0cyMroinI0@public.gmane.org>
2014-06-11 11:45 ` [resend][PATCH " Roger Quadros
2014-06-11 8:56 ` [PATCH 36/36] ARM: OMAP2+: defconfig: Enable TI GPMC driver Roger Quadros
[not found] ` <1402477001-31132-1-git-send-email-rogerq-l0cyMroinI0@public.gmane.org>
2014-06-11 11:52 ` [PATCH 00/36] OMAP: GPMC: Restructure and move OMAP GPMC driver out of mach-omap2 Javier Martinez Canillas
2014-06-11 11:54 ` Roger Quadros
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