From ddab3838aa3332ed2c8ea96accbed5218a2a72b7 Mon Sep 17 00:00:00 2001 From: Huang Shijie Date: Thu, 13 Sep 2012 14:57:54 +0800 Subject: mtd: gpmi: add a new field for HW_GPMI_TIMING1 The gpmi_nfc_compute_hardware_timing{} should contains all the fields setting for gpmi timing registers. It already contains the fields for HW_GPMI_TIMING0 and HW_GPMI_CTRL1. So it is better to add a new field setting for HW_GPMI_TIMING1 in this data structure. This makes the code more clear in logic. This patch also changes some comments to make the code more readable. Signed-off-by: Huang Shijie Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse --- drivers/mtd/nand/gpmi-nand/gpmi-lib.c | 17 +++++++++-------- drivers/mtd/nand/gpmi-nand/gpmi-nand.h | 10 ++++++++++ drivers/mtd/nand/gpmi-nand/gpmi-regs.h | 3 +++ 3 files changed, 22 insertions(+), 8 deletions(-) (limited to 'drivers') diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c index 2289cf8dc35..c95dbe8bb27 100644 --- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c +++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c @@ -728,6 +728,7 @@ return_results: hw->address_setup_in_cycles = address_setup_in_cycles; hw->use_half_periods = dll_use_half_periods; hw->sample_delay_factor = sample_delay_factor; + hw->device_busy_timeout = GPMI_DEFAULT_BUSY_TIMEOUT; /* Return success. */ return 0; @@ -752,26 +753,26 @@ void gpmi_begin(struct gpmi_nand_data *this) goto err_out; } - /* set ready/busy timeout */ - writel(0x500 << BP_GPMI_TIMING1_BUSY_TIMEOUT, - gpmi_regs + HW_GPMI_TIMING1); - /* Get the timing information we need. */ nfc->clock_frequency_in_hz = clk_get_rate(r->clock[0]); clock_period_in_ns = 1000000000 / nfc->clock_frequency_in_hz; gpmi_nfc_compute_hardware_timing(this, &hw); - /* Set up all the simple timing parameters. */ + /* [1] Set HW_GPMI_TIMING0 */ reg = BF_GPMI_TIMING0_ADDRESS_SETUP(hw.address_setup_in_cycles) | BF_GPMI_TIMING0_DATA_HOLD(hw.data_hold_in_cycles) | BF_GPMI_TIMING0_DATA_SETUP(hw.data_setup_in_cycles) ; writel(reg, gpmi_regs + HW_GPMI_TIMING0); - /* - * DLL_ENABLE must be set to 0 when setting RDN_DELAY or HALF_PERIOD. - */ + /* [2] Set HW_GPMI_TIMING1 */ + writel(BF_GPMI_TIMING1_BUSY_TIMEOUT(hw.device_busy_timeout), + gpmi_regs + HW_GPMI_TIMING1); + + /* [3] The following code is to set the HW_GPMI_CTRL1. */ + + /* DLL_ENABLE must be set to 0 when setting RDN_DELAY or HALF_PERIOD. */ writel(BM_GPMI_CTRL1_DLL_ENABLE, gpmi_regs + HW_GPMI_CTRL1_CLR); /* Clear out the DLL control fields. */ diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h index 1f612178233..c814bddaffc 100644 --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h @@ -189,14 +189,24 @@ struct gpmi_nand_data { * @data_setup_in_cycles: The data setup time, in cycles. * @data_hold_in_cycles: The data hold time, in cycles. * @address_setup_in_cycles: The address setup time, in cycles. + * @device_busy_timeout: The timeout waiting for NAND Ready/Busy, + * this value is the number of cycles multiplied + * by 4096. * @use_half_periods: Indicates the clock is running slowly, so the * NFC DLL should use half-periods. * @sample_delay_factor: The sample delay factor. */ struct gpmi_nfc_hardware_timing { + /* for HW_GPMI_TIMING0 */ uint8_t data_setup_in_cycles; uint8_t data_hold_in_cycles; uint8_t address_setup_in_cycles; + + /* for HW_GPMI_TIMING1 */ + uint16_t device_busy_timeout; +#define GPMI_DEFAULT_BUSY_TIMEOUT 0x500 /* default busy timeout value.*/ + + /* for HW_GPMI_CTRL1 */ bool use_half_periods; uint8_t sample_delay_factor; }; diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-regs.h b/drivers/mtd/nand/gpmi-nand/gpmi-regs.h index 83431240e2f..8994e201924 100644 --- a/drivers/mtd/nand/gpmi-nand/gpmi-regs.h +++ b/drivers/mtd/nand/gpmi-nand/gpmi-regs.h @@ -154,6 +154,9 @@ #define HW_GPMI_TIMING1 0x00000080 #define BP_GPMI_TIMING1_BUSY_TIMEOUT 16 +#define BM_GPMI_TIMING1_BUSY_TIMEOUT (0xffff << BP_GPMI_TIMING1_BUSY_TIMEOUT) +#define BF_GPMI_TIMING1_BUSY_TIMEOUT(v) \ + (((v) << BP_GPMI_TIMING1_BUSY_TIMEOUT) & BM_GPMI_TIMING1_BUSY_TIMEOUT) #define HW_GPMI_TIMING2 0x00000090 #define HW_GPMI_DATA 0x000000a0 -- cgit v1.2.3