diff options
| author | Jeff Westfahl <jeff.westfahl@ni.com> | 2017-11-06 00:34:46 -0800 |
|---|---|---|
| committer | Michal Simek <michal.simek@xilinx.com> | 2017-11-28 15:53:07 +0100 |
| commit | 8000d6ea3fc99fba43e84d870632ebde3117bb35 (patch) | |
| tree | d466e8db0fc284982f1a8b32cd93d5266dfca7a9 /drivers/mtd/nand | |
| parent | 413ab5b0e1b88057e472ea63eb05b00eee9cf6b1 (diff) | |
mtd: nand: zynq: Add a config option to use 1st stage bootloader timing
In legacy method, 1st stage bootloader was used to configure the HW
setting such as NAND timing. Hence, adding a config option in Zynq
NAND driver for the compatibility of device that using 1st stage
bootloder instead of U-boot SPL.
This commit is to add config option
CONFIG_NAND_ZYNQ_USE_BOOTLOADER1_TIMINGS that allow NAND driver use
timing values set by the 1st stage bootloader, instead of the hard-coded
values in the Zynq NAND driver.
Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com>
Signed-off-by: Wilson Lee <wilson.lee@ni.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Keng Soon Cheah <keng.soon.cheah@ni.com>
Cc: Chen Yee Chew <chen.yee.chew@ni.com>
Cc: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Scott Wood <oss@buserror.net>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'drivers/mtd/nand')
| -rw-r--r-- | drivers/mtd/nand/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/mtd/nand/zynq_nand.c | 5 |
2 files changed, 12 insertions, 0 deletions
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig index ca9819344e..75023dc06b 100644 --- a/drivers/mtd/nand/Kconfig +++ b/drivers/mtd/nand/Kconfig @@ -165,6 +165,13 @@ config NAND_ZYNQ This enables Nand driver support for Nand flash controller found on Zynq SoC. +config NAND_ZYNQ_USE_BOOTLOADER1_TIMINGS + bool "Enable use of 1st stage bootloader timing for NAND" + depends on NAND_ZYNQ + help + This flag prevent U-boot reconfigure NAND flash controller and reuse + the NAND timing from 1st stage bootloader. + comment "Generic NAND options" # Enhance depends when converting drivers to Kconfig which use this config diff --git a/drivers/mtd/nand/zynq_nand.c b/drivers/mtd/nand/zynq_nand.c index 948f05984c..8d6a663d72 100644 --- a/drivers/mtd/nand/zynq_nand.c +++ b/drivers/mtd/nand/zynq_nand.c @@ -35,6 +35,8 @@ (0x1 << 4) | /* Clear interrupt */ \ (0x1 << 6)) /* Disable ECC interrupt */ +#ifndef CONFIG_NAND_ZYNQ_USE_BOOTLOADER1_TIMINGS + /* Assuming 50MHz clock (20ns cycle time) and 3V operation */ #define ZYNQ_NAND_SET_CYCLES ((0x2 << 20) | /* t_rr from nand_cycles */ \ (0x2 << 17) | /* t_ar from nand_cycles */ \ @@ -43,6 +45,7 @@ (0x2 << 8) | /* t_rea from nand_cycles */ \ (0x5 << 4) | /* t_wc from nand_cycles */ \ (0x5 << 0)) /* t_rc from nand_cycles */ +#endif #define ZYNQ_NAND_DIRECT_CMD ((0x4 << 23) | /* Chip 0 from interface 1 */ \ @@ -245,8 +248,10 @@ static int zynq_nand_init_nand_flash(int option) /* disable interrupts */ writel(ZYNQ_NAND_CLR_CONFIG, &zynq_nand_smc_base->cfr); +#ifndef CONFIG_NAND_ZYNQ_USE_BOOTLOADER1_TIMINGS /* Initialize the NAND interface by setting cycles and operation mode */ writel(ZYNQ_NAND_SET_CYCLES, &zynq_nand_smc_base->scr); +#endif if (option & NAND_BUSWIDTH_16) writel(ZYNQ_NAND_SET_OPMODE_16BIT, &zynq_nand_smc_base->sor); else |