From: Janusz Krzysztofik <jmkrzyszt@gmail.com>
To: Boris Brezillon <boris.brezillon@bootlin.com>,
Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>,
David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
Marek Vasut <marek.vasut@gmail.com>,
linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
Janusz Krzysztofik <jmkrzyszt@gmail.com>
Subject: [PATCH v3 1/3] mtd: rawnand: Provide helper for polling GPIO R/B pin
Date: Mon, 15 Oct 2018 21:41:28 +0200 [thread overview]
Message-ID: <20181015194130.21764-1-jmkrzyszt@gmail.com> (raw)
In-Reply-To: <20181012204101.26274-1-jmkrzyszt@gmail.com>
Each controller driver having access to NAND R/B pin over GPIO would
have to reimplement the polling loop otherwise.
Suggested-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
---
Changelog:
v3:
- don't surround added code with #ifdef CONFIG_GPIOLIB - sugeested by
Boris Brezillon - thanks,
- drop inadequate comment on calling ->exec_op() recursively - catched
by Boris Brezillon, thanks,
- drop redundant commend from header file - suggensted by Boris
Brezillon - thanks,
- update comment on waiting for R/B pin rather than command completion
v2:
New patch - v1 consisted of only one patch reusing legacy helper
drivers/mtd/nand/raw/nand_base.c | 31 +++++++++++++++++++++++++++++++
include/linux/mtd/rawnand.h | 4 ++++
2 files changed, 35 insertions(+)
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 05bd0779fe9b..0d5a2dc59b8d 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -45,6 +45,7 @@
#include <linux/io.h>
#include <linux/mtd/partitions.h>
#include <linux/of.h>
+#include <linux/gpio/consumer.h>
#include "internals.h"
@@ -531,6 +532,36 @@ int nand_soft_waitrdy(struct nand_chip *chip, unsigned long timeout_ms)
};
EXPORT_SYMBOL_GPL(nand_soft_waitrdy);
+/**
+ * nand_gpio_waitrdy - Poll R/B GPIO pin until ready
+ * @chip: NAND chip structure
+ * @gpiod: GPIO descriptor of R/B pin
+ * @timeout_ms: Timeout in ms
+ *
+ * Poll the R/B GPIO pin until it becomes ready. If that does not happen
+ * whitin the specified timeout, -ETIMEDOUT is returned.
+ *
+ * This helper is intended to be used when the controller has access to the
+ * NAND R/B pin over GPIO.
+ *
+ * Return 0 if the R/B pin indicates chip is ready, a negative error otherwise.
+ */
+int nand_gpio_waitrdy(struct nand_chip *chip, struct gpio_desc *gpiod,
+ unsigned long timeout_ms)
+{
+ /* Wait until R/B pin indicates chip is ready or timeout occurs */
+ timeout_ms = jiffies + msecs_to_jiffies(timeout_ms);
+ do {
+ if (gpiod_get_value_cansleep(gpiod))
+ return 0;
+
+ cond_resched();
+ } while (time_before(jiffies, timeout_ms));
+
+ return gpiod_get_value_cansleep(gpiod) ? 0 : -ETIMEDOUT;
+};
+EXPORT_SYMBOL_GPL(nand_gpio_waitrdy);
+
/**
* panic_nand_get_device - [GENERIC] Get chip for selected access
* @chip: the nand chip descriptor
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index e10b126e148f..4e91a70ede10 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1346,4 +1346,8 @@ void nand_release(struct nand_chip *chip);
*/
int nand_soft_waitrdy(struct nand_chip *chip, unsigned long timeout_ms);
+struct gpio_desc;
+int nand_gpio_waitrdy(struct nand_chip *chip, struct gpio_desc *gpiod,
+ unsigned long timeout_ms);
+
#endif /* __LINUX_MTD_RAWNAND_H */
--
2.16.4
next prev parent reply other threads:[~2018-10-15 19:40 UTC|newest]
Thread overview: 206+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-18 23:57 [RFC PATCH 0/8] mtd: rawnand: ams-delta: Use gpio-omap accessors for data I/O Janusz Krzysztofik
2018-07-18 23:57 ` [RFC PATCH 1/8] mtd: rawnand: ams-delta: Use private structure Janusz Krzysztofik
2018-07-19 6:17 ` Boris Brezillon
2018-07-20 17:57 ` Janusz Krzysztofik
2018-07-18 23:57 ` [RFC PATCH 2/8] mtd: rawnand: ams-delta: Write protect device during probe Janusz Krzysztofik
2018-07-19 6:22 ` Boris Brezillon
2018-07-20 18:02 ` Janusz Krzysztofik
2018-07-18 23:57 ` [RFC PATCH 3/8] mtd: rawnand: ams-delta: Set port direction once per transfer Janusz Krzysztofik
2018-07-19 6:23 ` Boris Brezillon
2018-07-20 18:12 ` Janusz Krzysztofik
2018-07-20 19:29 ` Boris Brezillon
2018-07-18 23:57 ` [RFC PATCH 4/8] mtd: rawnand: ams-delta: Optimize pointer resolution on read/write Janusz Krzysztofik
2018-07-19 6:25 ` Boris Brezillon
2018-07-20 18:14 ` Janusz Krzysztofik
2018-07-20 19:29 ` Boris Brezillon
2018-07-18 23:57 ` [RFC PATCH 5/8] mtd: rawnand: ams-delta: Request data port GPIO resource Janusz Krzysztofik
2018-07-19 6:28 ` Boris Brezillon
2018-07-18 23:57 ` [RFC PATCH 6/8] gpio: omap: Add get/set_multiple() callbacks Janusz Krzysztofik
2018-07-29 20:29 ` Linus Walleij
2018-08-03 1:52 ` Grygorii Strashko
2018-08-03 16:47 ` Linus Walleij
2018-07-18 23:57 ` [RFC PATCH 7/8] mtd: rawnand: ams-delta: Check sanity of data GPIO resource Janusz Krzysztofik
2018-07-19 6:44 ` Boris Brezillon
2018-07-29 20:36 ` Linus Walleij
2018-07-29 21:16 ` Boris Brezillon
2018-07-29 20:33 ` Linus Walleij
2018-07-18 23:57 ` [RFC PATCH 8/8] mtd: rawnand: ams-delta: Use GPIO callbacks for data I/O Janusz Krzysztofik
2018-07-19 6:47 ` Boris Brezillon
2018-07-20 18:38 ` Janusz Krzysztofik
2018-07-20 19:48 ` Boris Brezillon
2018-07-19 6:15 ` [RFC PATCH 0/8] mtd: rawnand: ams-delta: Use gpio-omap accessors " Boris Brezillon
2018-07-20 17:55 ` Janusz Krzysztofik
2018-07-20 19:25 ` Boris Brezillon
2018-10-03 12:00 ` [RFC PATCH] mtd: rawnand: ams-delta: use ->exec_op() Janusz Krzysztofik
2018-10-03 12:30 ` Boris Brezillon
2018-10-03 13:55 ` Janusz Krzysztofik
2018-10-03 14:06 ` Boris Brezillon
2018-10-04 13:52 ` Janusz Krzysztofik
2018-10-04 13:59 ` Boris Brezillon
2018-10-04 14:11 ` Janusz Krzysztofik
2018-10-04 14:22 ` Boris Brezillon
2018-10-12 20:41 ` [PATCH v2 1/2] mtd: rawnand: Provide helper for polling GPIO R/B pin Janusz Krzysztofik
2018-10-12 20:41 ` [PATCH v2 2/2] mtd: rawnand: ams-delta: Use ->exec_op() Janusz Krzysztofik
2018-10-13 6:05 ` Boris Brezillon
2018-10-13 5:55 ` [PATCH v2 1/2] mtd: rawnand: Provide helper for polling GPIO R/B pin Boris Brezillon
2018-10-15 19:41 ` Janusz Krzysztofik [this message]
2018-10-15 19:41 ` [PATCH v3 2/3] mtd: rawnand: ams-delta: Stop using legacy .IOADDR_R/W Janusz Krzysztofik
2018-10-15 19:41 ` [PATCH v3 3/3] mtd: rawnand: ams-delta: Convert the driver to ->exec_op() Janusz Krzysztofik
2018-11-11 20:53 ` [PATCH v3 1/3] mtd: rawnand: Provide helper for polling GPIO R/B pin Miquel Raynal
2018-08-06 22:29 ` [RFC PATCH v2] mtd: rawnand: ams-delta: Use GPIO API for data I/O Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 01/12] mtd: rawnand: ams-delta: Assign mtd->dev.parent, not mtd->owner Janusz Krzysztofik
2018-08-06 23:54 ` Marek Vasut
2018-08-07 21:55 ` Janusz Krzysztofik
2018-08-07 16:57 ` Boris Brezillon
2018-08-06 22:29 ` [RFC PATCH v2 02/12] mtd: rawnand: ams-delta: Use private structure Janusz Krzysztofik
2018-08-07 16:59 ` Boris Brezillon
2018-08-06 22:29 ` [RFC PATCH v2 03/12] ARM: OMAP1: ams-delta: Provide GPIO lookup table for NAND data port Janusz Krzysztofik
2018-08-07 16:59 ` Boris Brezillon
2018-08-10 10:10 ` Linus Walleij
2018-08-06 22:29 ` [RFC PATCH v2 04/12] mtd: rawnand: ams-delta: request data port GPIO resource Janusz Krzysztofik
2018-08-07 17:00 ` Boris Brezillon
2018-08-10 10:11 ` Linus Walleij
2018-08-06 22:29 ` [RFC PATCH v2 05/12] mtd: rawnand: ams-delta: use GPIO API for data read/write Janusz Krzysztofik
2018-08-06 23:57 ` Marek Vasut
2018-08-07 17:06 ` Boris Brezillon
2018-08-07 17:11 ` Janusz Krzysztofik
2018-08-10 10:25 ` Linus Walleij
2018-08-06 22:29 ` [RFC PATCH v2 06/12] ARM: OMAP1: ams-delta: drop obsolete NAND resources Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 07/12] mtd: rawnand: ams-delta: Set port direction once per transfer Janusz Krzysztofik
2018-08-07 18:57 ` Boris Brezillon
2018-08-08 16:55 ` Janusz Krzysztofik
2018-08-08 17:42 ` Miquel Raynal
2018-08-06 22:29 ` [RFC PATCH v2 08/12] mtd: rawnand: ams-delta: Simplify pointer resolution on read/write Janusz Krzysztofik
2018-08-07 17:02 ` Boris Brezillon
2018-08-07 17:15 ` Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 09/12] gpiolib: Identify GPIO descriptor arrays with direct mapping Janusz Krzysztofik
2018-08-06 23:29 ` Linus Walleij
2018-08-07 16:50 ` Janusz Krzysztofik
2018-08-07 17:10 ` Boris Brezillon
2018-08-07 17:14 ` Boris Brezillon
2018-08-07 17:19 ` Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 10/12] gpiolib: Introduce bitmap get/set array API extension Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 11/12] mtd: rawnand: ams-delta: Use GPIO API bitmap extension Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 12/12] gpiolib: Add fast processing path to bitmap API functions Janusz Krzysztofik
2018-08-06 23:43 ` Linus Walleij
2018-08-07 17:29 ` Janusz Krzysztofik
2018-08-07 17:47 ` Boris Brezillon
2018-08-10 10:55 ` Linus Walleij
2018-08-13 22:34 ` [PATCH v3 0/7] mtd: rawnand: ams-delta: Use GPIO API for data I/O Janusz Krzysztofik
2018-08-13 22:34 ` [PATCH v3 1/7] mtd: rawnand: ams-delta: show parent device in sysfs Janusz Krzysztofik
2018-08-13 22:34 ` [PATCH v3 2/7] mtd: rawnand: ams-delta: Use private structure Janusz Krzysztofik
2018-08-13 22:34 ` [PATCH v3 3/7] ARM: OMAP1: ams-delta: Provide GPIO lookup table for NAND data port Janusz Krzysztofik
2018-08-13 22:34 ` [PATCH v3 4/7] mtd: rawnand: ams-delta: request data port GPIO resource Janusz Krzysztofik
2018-08-13 22:34 ` [PATCH v3 5/7] mtd: rawnand: ams-delta: Set port direction when needed Janusz Krzysztofik
2018-08-16 7:30 ` Boris Brezillon
2018-08-13 22:34 ` [PATCH v3 6/7] mtd: rawnand: ams-delta: Simplify pointer resolution on read/write Janusz Krzysztofik
2018-08-13 22:34 ` [PATCH v3 7/7] mtd: rawnand: ams-delta: use GPIO API for data I/O Janusz Krzysztofik
2018-08-16 7:39 ` Boris Brezillon
2018-08-20 21:39 ` [PATCH v4 0/3] mtd: rawnand: ams-delta: Cleanups and optimizations Janusz Krzysztofik
2018-08-20 21:39 ` [PATCH v4 1/3] mtd: rawnand: ams-delta: show parent device in sysfs Janusz Krzysztofik
2018-08-20 21:39 ` [PATCH v4 2/3] mtd: rawnand: ams-delta: Use private structure Janusz Krzysztofik
2018-08-20 21:39 ` [PATCH v4 3/3] mtd: rawnand: ams-delta: Set port direction when needed Janusz Krzysztofik
2018-08-24 12:57 ` Boris Brezillon
2018-09-05 6:47 ` [PATCH v4 0/3] mtd: rawnand: ams-delta: Cleanups and optimizations Miquel Raynal
2018-09-05 20:53 ` Janusz Krzysztofik
2018-09-07 16:45 ` Tony Lindgren
2018-09-19 8:46 ` Miquel Raynal
2018-09-19 22:52 ` [PATCH v5 " Janusz Krzysztofik
2018-09-19 22:52 ` [PATCH v5 1/3] mtd: rawnand: ams-delta: show parent device in sysfs Janusz Krzysztofik
2018-09-19 22:52 ` [PATCH v5 2/3] mtd: rawnand: ams-delta: Use private structure Janusz Krzysztofik
2018-09-19 22:52 ` [PATCH v5 3/3] mtd: rawnand: ams-delta: Set port direction when needed Janusz Krzysztofik
2018-09-23 11:35 ` [PATCH v5 0/3] mtd: rawnand: ams-delta: Cleanups and optimizations Miquel Raynal
2018-08-20 23:43 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-08-21 6:49 ` Peter Rosin
2018-08-21 6:52 ` Peter Rosin
2018-08-29 12:03 ` Miguel Ojeda
2018-08-29 18:01 ` Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-08-29 9:06 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Linus Walleij
2018-08-29 18:16 ` Janusz Krzysztofik
2018-08-29 10:19 ` Ulf Hansson
2018-08-29 20:48 ` [PATH v5 " Janusz Krzysztofik
2018-08-29 20:48 ` [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-08-30 4:30 ` Peter Rosin
2018-08-30 7:40 ` Geert Uytterhoeven
2018-08-30 11:10 ` Miguel Ojeda
2018-08-30 15:35 ` David Laight
2018-09-02 10:19 ` Janusz Krzysztofik
2018-08-31 9:14 ` Linus Walleij
2018-08-29 20:48 ` [PATCH v5 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
2018-08-29 20:48 ` [PATCH v5 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-08-29 20:49 ` [PATCH v5 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-08-31 22:56 ` [PATH v6 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-08-31 22:56 ` [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-01 0:23 ` Peter Rosin
2018-09-04 15:28 ` kbuild test robot
2018-09-04 15:28 ` kbuild test robot
2018-08-31 22:56 ` [PATCH v6 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
2018-08-31 22:56 ` [PATCH v6 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-09-04 15:27 ` kbuild test robot
2018-08-31 22:56 ` [PATCH v6 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-02 13:21 ` Lukas Wunner
2018-09-03 4:31 ` Matthew Wilcox
2018-09-03 14:24 ` Geert Uytterhoeven
2018-09-03 15:07 ` Geert Uytterhoeven
2018-09-04 15:29 ` kbuild test robot
2018-09-05 6:46 ` kbuild test robot
2018-09-02 12:01 ` [PATCH v7 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-09-03 14:21 ` Geert Uytterhoeven
2018-09-04 15:23 ` kbuild test robot
2018-09-05 7:11 ` kbuild test robot
2018-09-02 12:01 ` [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
[not found] ` <CGME20180920101151eucas1p221f5a1715b8556bb9d99bf08fe09ce6f@eucas1p2.samsung.com>
2018-09-20 10:11 ` Marek Szyprowski
2018-09-20 15:48 ` Janusz Krzysztofik
2018-09-20 16:21 ` Janusz Krzysztofik
2018-09-21 8:18 ` Marek Szyprowski
2018-09-21 10:51 ` Janusz Krzysztofik
2018-09-21 11:26 ` Janusz Krzysztofik
2018-09-21 14:14 ` Marek Szyprowski
2018-09-23 10:43 ` Janusz Krzysztofik
2018-09-23 23:53 ` [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path Janusz Krzysztofik
2018-09-23 23:53 ` [PATCH 1/2] gpiolib: Fix missing updates of bitmap index Janusz Krzysztofik
2018-09-24 8:11 ` Linus Walleij
2018-09-29 12:20 ` [PATCH] gpiolib: Fix incorrect use of find_next_zero_bit() Janusz Krzysztofik
2018-10-01 6:46 ` Marek Szyprowski
2018-10-01 9:37 ` Linus Walleij
2018-09-23 23:53 ` [PATCH 2/2] gpiolib: Fix array members of same chip processed separately Janusz Krzysztofik
2018-09-24 8:13 ` Linus Walleij
2018-09-24 9:43 ` [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path Marek Szyprowski
2018-09-24 11:08 ` Janusz Krzysztofik
2018-09-24 11:38 ` Marek Szyprowski
2018-09-24 14:18 ` Janusz Krzysztofik
2018-09-25 19:24 ` [PATCH] mmc: pwrseq_simple: Fix incorrect handling of GPIO bitmap Janusz Krzysztofik
2018-09-26 7:50 ` Linus Walleij
2018-09-26 8:14 ` Marek Szyprowski
[not found] ` <7a4906d9-ffb1-f2af-07e7-d5815dcd0d8c@samsung.com>
2018-09-26 8:27 ` Marek Szyprowski
2018-10-12 19:09 ` [RFT PATCH] " Janusz Krzysztofik
2018-10-15 8:32 ` Marek Szyprowski
2018-10-15 10:29 ` Ulf Hansson
2018-10-15 14:27 ` Linus Walleij
2018-09-20 18:05 ` [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array Dan Carpenter
2018-09-20 15:49 ` Linus Walleij
2018-09-05 21:50 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-09-13 9:22 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Linus Walleij
2018-09-19 18:08 ` Linus Walleij
2018-11-21 11:08 ` Subject: [PATCH v4 0/4] mtd: rawnand: ams-delta: Use GPIO API for data I/O Janusz Krzysztofik
2018-11-21 11:08 ` [PATCH v4 1/4] ARM: OMAP1: ams-delta: Provide GPIO lookup table for NAND data port Janusz Krzysztofik
2018-11-23 17:02 ` Tony Lindgren
2018-11-21 11:08 ` [PATCH v4 2/4] mtd: rawnand: ams-delta: Request data port GPIO resource Janusz Krzysztofik
2018-11-21 11:08 ` [PATCH v4 3/4] mtd: rawnand: ams-delta: Use GPIO API for data I/O Janusz Krzysztofik
2018-11-21 14:53 ` Boris Brezillon
2018-11-21 11:08 ` [PATCH v4 4/4] ARM: OMAP1: ams-delta: Drop obsolete NAND resources Janusz Krzysztofik
2018-11-21 14:56 ` Subject: [PATCH v4 0/4] mtd: rawnand: ams-delta: Use GPIO API for data I/O Boris Brezillon
2018-11-23 17:03 ` Tony Lindgren
2018-12-07 8:04 ` Miquel Raynal
2018-12-07 16:10 ` Tony Lindgren
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