[MTD] [NAND] driver extension to support NAND on TQM85xx modules

This patch extends the FSL UPM NAND driver from Anton Vorontsov to
support hardware which does not have the R/B pin of the NAND chip
connected, like the TQM8548 module:

- The OF_GPIO dependency has been removed from the Kconfig option
  because GPIO is not needed. The relevant gpio_* function are then
  stubbed out in <linux/gpio.h>.

- It re-introduces the chip-delay property to define an appropriate
  maximum delay time (tR) required for read operations. The binding
  will be documented in a separate patch.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

2 files changed, 14 insertions, 5 deletions

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 7153854eb83a..18b9ffeabc98 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -401,7 +401,7 @@ config MTD_NAND_FSL_ELBC
 
 config MTD_NAND_FSL_UPM
         tristate "Support for NAND on Freescale UPM"
-        depends on MTD_NAND && OF_GPIO && (PPC_83xx || PPC_85xx)
+        depends on MTD_NAND && (PPC_83xx || PPC_85xx)
         select FSL_LBC
         help
           Enables support for NAND Flash chips wired onto Freescale PowerPC
diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c
index 3af5ef399a0f..024e3fffd4bb 100644
--- a/drivers/mtd/nand/fsl_upm.c
+++ b/drivers/mtd/nand/fsl_upm.c
@@ -13,6 +13,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/delay.h>
 #include <linux/mtd/nand.h>
 #include <linux/mtd/nand_ecc.h>
 #include <linux/mtd/partitions.h>
@@ -36,6 +37,7 @@ struct fsl_upm_nand {
         uint8_t upm_cmd_offset;
         void __iomem *io_base;
         int rnb_gpio;
+        int chip_delay;
 };
 
 #define to_fsl_upm_nand(mtd) container_of(mtd, struct fsl_upm_nand, mtd)
@@ -58,10 +60,11 @@ static void fun_wait_rnb(struct fsl_upm_nand *fun)
         if (fun->rnb_gpio >= 0) {
                 while (--cnt && !fun_chip_ready(&fun->mtd))
                         cpu_relax();
+                if (!cnt)
+                        dev_err(fun->dev, "tired waiting for RNB\n");
+        } else {
+                ndelay(100);
         }
-
-        if (!cnt)
-                dev_err(fun->dev, "tired waiting for RNB\n");
 }
 
 static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
@@ -129,7 +132,7 @@ static int __devinit fun_chip_init(struct fsl_upm_nand *fun,
         fun->chip.IO_ADDR_R = fun->io_base;
         fun->chip.IO_ADDR_W = fun->io_base;
         fun->chip.cmd_ctrl = fun_cmd_ctrl;
-        fun->chip.chip_delay = 50;
+        fun->chip.chip_delay = fun->chip_delay;
         fun->chip.read_byte = fun_read_byte;
         fun->chip.read_buf = fun_read_buf;
         fun->chip.write_buf = fun_write_buf;
@@ -228,6 +231,12 @@ static int __devinit fun_probe(struct of_device *ofdev,
                 goto err2;
         }
 
+        prop = of_get_property(ofdev->node, "chip-delay", NULL);
+        if (prop)
+                fun->chip_delay = *prop;
+        else
+                fun->chip_delay = 50;
+
         fun->io_base = devm_ioremap_nocache(&ofdev->dev, io_res.start,
                                           io_res.end - io_res.start + 1);
         if (!fun->io_base) {