From 8000d6ea3fc99fba43e84d870632ebde3117bb35 Mon Sep 17 00:00:00 2001 From: Jeff Westfahl Date: Mon, 6 Nov 2017 00:34:46 -0800 Subject: [PATCH] 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 Signed-off-by: Wilson Lee Cc: Joe Hershberger Cc: Keng Soon Cheah Cc: Chen Yee Chew Cc: Siva Durga Prasad Paladugu Cc: Michal Simek Cc: Scott Wood Signed-off-by: Michal Simek --- drivers/mtd/nand/Kconfig | 7 +++++++ drivers/mtd/nand/zynq_nand.c | 5 +++++ 2 files changed, 12 insertions(+) diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig index ca98193..75023dc 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 948f059..8d6a663 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 -- 2.7.4