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Groups > linux.kernel > #1373241
| From | Roger Quadros <rogerq@ti.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v6 17/17] mtd: nand: omap2: Implement NAND ready using gpiolib |
| Date | 2016-04-07 12:20 +0200 |
| Message-ID | <rlfcC-2gO-33@gated-at.bofh.it> (permalink) |
| References | <rlfcB-2gO-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
The GPMC WAIT pin status are now available over gpiolib.
Update the omap_dev_ready() function to use gpio instead of
directly accessing GPMC register space.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
.../devicetree/bindings/mtd/gpmc-nand.txt | 2 ++
drivers/mtd/nand/omap2.c | 29 ++++++++++++++--------
include/linux/platform_data/mtd-nand-omap2.h | 2 +-
3 files changed, 21 insertions(+), 12 deletions(-)
diff --git a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
index ff3215d2..3ee7e20 100644
--- a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
@@ -48,6 +48,7 @@ Optional properties:
locating ECC errors for BCHx algorithms. SoC devices which have
ELM hardware engines should specify this device node in .dtsi
Using ELM for ECC error correction frees some CPU cycles.
+ - rb-gpios: GPIO specifier for the ready/busy# pin.
For inline partition table parsing (optional):
@@ -78,6 +79,7 @@ Example for an AM33xx board:
nand-bus-width = <16>;
ti,nand-ecc-opt = "bch8";
ti,nand-xfer-type = "polled";
+ rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 */
gpmc,sync-clk-ps = <0>;
gpmc,cs-on-ns = <0>;
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 35b8f33..e0b2b2f 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -12,6 +12,7 @@
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
@@ -182,6 +183,8 @@ struct omap_nand_info {
struct nand_ecclayout oobinfo;
/* fields specific for BCHx_HW ECC scheme */
struct device *elm_dev;
+ /* NAND ready gpio */
+ struct gpio_desc *ready_gpiod;
};
static inline struct omap_nand_info *mtd_to_omap(struct mtd_info *mtd)
@@ -1023,21 +1026,16 @@ static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip)
}
/**
- * omap_dev_ready - calls the platform specific dev_ready function
+ * omap_dev_ready - checks the NAND Ready GPIO line
* @mtd: MTD device structure
+ *
+ * Returns true if ready and false if busy.
*/
static int omap_dev_ready(struct mtd_info *mtd)
{
- unsigned int val = 0;
struct omap_nand_info *info = mtd_to_omap(mtd);
- val = readl(info->reg.gpmc_status);
-
- if ((val & 0x100) == 0x100) {
- return 1;
- } else {
- return 0;
- }
+ return gpiod_get_value(info->ready_gpiod);
}
/**
@@ -1755,7 +1753,9 @@ static int omap_nand_probe(struct platform_device *pdev)
info->gpmc_cs = pdata->cs;
info->reg = pdata->reg;
info->ecc_opt = pdata->ecc_opt;
- info->dev_ready = pdata->dev_ready;
+ if (pdata->dev_ready)
+ dev_info(&pdev->dev, "pdata->dev_ready is deprecated\n");
+
info->xfer_type = pdata->xfer_type;
info->devsize = pdata->devsize;
info->elm_of_node = pdata->elm_of_node;
@@ -1787,6 +1787,13 @@ static int omap_nand_probe(struct platform_device *pdev)
nand_chip->IO_ADDR_W = nand_chip->IO_ADDR_R;
nand_chip->cmd_ctrl = omap_hwcontrol;
+ info->ready_gpiod = devm_gpiod_get_optional(&pdev->dev, "rb",
+ GPIOD_IN);
+ if (IS_ERR(info->ready_gpiod)) {
+ dev_err(dev, "failed to get ready gpio\n");
+ return PTR_ERR(info->ready_gpiod);
+ }
+
/*
* If RDY/BSY line is connected to OMAP then use the omap ready
* function and the generic nand_wait function which reads the status
@@ -1794,7 +1801,7 @@ static int omap_nand_probe(struct platform_device *pdev)
* chip delay which is slightly more than tR (AC Timing) of the NAND
* device and read status register until you get a failure or success
*/
- if (info->dev_ready) {
+ if (info->ready_gpiod) {
nand_chip->dev_ready = omap_dev_ready;
nand_chip->chip_delay = 0;
} else {
diff --git a/include/linux/platform_data/mtd-nand-omap2.h b/include/linux/platform_data/mtd-nand-omap2.h
index 7f6de53..17d57a1 100644
--- a/include/linux/platform_data/mtd-nand-omap2.h
+++ b/include/linux/platform_data/mtd-nand-omap2.h
@@ -71,7 +71,6 @@ struct omap_nand_platform_data {
int cs;
struct mtd_partition *parts;
int nr_parts;
- bool dev_ready;
bool flash_bbt;
enum nand_io xfer_type;
int devsize;
@@ -82,5 +81,6 @@ struct omap_nand_platform_data {
/* deprecated */
struct gpmc_nand_regs reg;
struct device_node *of_node;
+ bool dev_ready;
};
#endif
--
2.5.0
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[PATCH v6 00/17] memory: omap-gpmc: mtd: nand: Support GPMC NAND on non-OMAP platforms Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 10/17] mtd: nand: omap: Update DT binding documentation Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 16/17] memory: omap-gpmc: Prevent GPMC_STATUS from being accessed via gpmc_regs Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 09/17] mtd: nand: omap: Clean up device tree support Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 14/17] memory: omap-gpmc: Reserve WAITPIN if needed for WAIT monitoring Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 03/17] memory: omap-gpmc: Introduce GPMC to NAND interface Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 05/17] memory: omap-gpmc: Implement IRQ domain for NAND IRQs Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
Re: [PATCH v6 05/17] memory: omap-gpmc: Implement IRQ domain for NAND IRQs Rob Herring <robh@kernel.org> - 2016-04-11 17:00 +0200
[PATCH v6 06/17] mtd: nand: omap: Use gpmc_omap_get_nand_ops() to get NAND registers Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 13/17] memory: omap-gpmc: Support general purpose input for WAITPINs Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
Re: [PATCH v6 13/17] memory: omap-gpmc: Support general purpose input for WAITPINs Rob Herring <robh@kernel.org> - 2016-04-11 17:10 +0200
[PATCH v6 17/17] mtd: nand: omap2: Implement NAND ready using gpiolib Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
Re: [PATCH v6 17/17] mtd: nand: omap2: Implement NAND ready using gpiolib Rob Herring <robh@kernel.org> - 2016-04-11 17:10 +0200
[PATCH v6 07/17] mtd: nand: omap: Switch to using GPMC-NAND ops for writebuffer empty check Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 11/17] memory: omap-gpmc: Prevent mapping into 1st 16MB Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 08/17] mtd: nand: omap: Copy platform data parameters to omap_nand_info data Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 01/17] ARM: OMAP2+: gpmc: Add platform data Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 04/17] memory: omap-gpmc: Add GPMC-NAND ops to get writebufferempty status Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 15/17] memory: omap-gpmc: Support WAIT pin edge interrupts Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
Re: [PATCH v6 15/17] memory: omap-gpmc: Support WAIT pin edge interrupts Rob Herring <robh@kernel.org> - 2016-04-11 17:10 +0200
[PATCH v6 02/17] ARM: OMAP2+: gpmc: Add gpmc timings and settings to platform data Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
[PATCH v6 12/17] memory: omap-gpmc: Move device tree binding to correct location Roger Quadros <rogerq@ti.com> - 2016-04-07 12:20 +0200
Re: [PATCH v6 00/17] memory: omap-gpmc: mtd: nand: Support GPMC NAND on non-OMAP platforms Tony Lindgren <tony@atomide.com> - 2016-04-13 23:30 +0200
Re: [PATCH v6 00/17] memory: omap-gpmc: mtd: nand: Support GPMC NAND on non-OMAP platforms Roger Quadros <rogerq@ti.com> - 2016-04-15 11:40 +0200
Re: [PATCH v6 00/17] memory: omap-gpmc: mtd: nand: Support GPMC NAND on non-OMAP platforms Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-04-15 12:10 +0200
Re: [PATCH v6 00/17] memory: omap-gpmc: mtd: nand: Support GPMC NAND on non-OMAP platforms Roger Quadros <rogerq@ti.com> - 2016-04-15 13:00 +0200
Re: [PATCH v6 00/17] memory: omap-gpmc: mtd: nand: Support GPMC NAND on non-OMAP platforms Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-04-15 13:20 +0200
Re: [PATCH v6 00/17] memory: omap-gpmc: mtd: nand: Support GPMC NAND on non-OMAP platforms Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-04-15 14:00 +0200
Re: [PATCH v6 00/17] memory: omap-gpmc: mtd: nand: Support GPMC NAND on non-OMAP platforms Tony Lindgren <tony@atomide.com> - 2016-04-15 17:50 +0200
Re: [PATCH v6 00/17] memory: omap-gpmc: mtd: nand: Support GPMC NAND on non-OMAP platforms Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-04-15 18:10 +0200
Re: [PATCH v6 00/17] memory: omap-gpmc: mtd: nand: Support GPMC NAND on non-OMAP platforms Tony Lindgren <tony@atomide.com> - 2016-04-15 18:30 +0200
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