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authorHuang Shijie <b32955@freescale.com>2012-09-13 14:57:57 +0800
committerDavid Woodhouse <David.Woodhouse@intel.com>2012-09-29 15:55:54 +0100
commitc50d35a9fdb628c5fcce5c2d4ab5ad9bedb2edb9 (patch)
tree12f5fca644d4dff62f43186240a6f1825e97f3e8 /drivers/mtd
parentd37e02d8f3a892b57738f1c1431779d5939214d1 (diff)
mtd: gpmi: simplify the DLL setting code
The setting DLL code is a little mess. Just simplify the code and the comments. Signed-off-by: Huang Shijie <b32955@freescale.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/gpmi-nand/gpmi-lib.c22
1 files changed, 9 insertions, 13 deletions
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
index 2d1f77c0527..010665ca631 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
@@ -779,30 +779,26 @@ void gpmi_begin(struct gpmi_nand_data *this)
writel(BM_GPMI_CTRL1_DLL_ENABLE, gpmi_regs + HW_GPMI_CTRL1_CLR);
/* Clear out the DLL control fields. */
- writel(BM_GPMI_CTRL1_RDN_DELAY, gpmi_regs + HW_GPMI_CTRL1_CLR);
- writel(BM_GPMI_CTRL1_HALF_PERIOD, gpmi_regs + HW_GPMI_CTRL1_CLR);
+ reg = BM_GPMI_CTRL1_RDN_DELAY | BM_GPMI_CTRL1_HALF_PERIOD;
+ writel(reg, gpmi_regs + HW_GPMI_CTRL1_CLR);
/* If no sample delay is called for, return immediately. */
if (!hw.sample_delay_factor)
return;
- /* Configure the HALF_PERIOD flag. */
- if (hw.use_half_periods)
- writel(BM_GPMI_CTRL1_HALF_PERIOD,
- gpmi_regs + HW_GPMI_CTRL1_SET);
+ /* Set RDN_DELAY or HALF_PERIOD. */
+ reg = ((hw.use_half_periods) ? BM_GPMI_CTRL1_HALF_PERIOD : 0)
+ | BF_GPMI_CTRL1_RDN_DELAY(hw.sample_delay_factor);
- /* Set the delay factor. */
- writel(BF_GPMI_CTRL1_RDN_DELAY(hw.sample_delay_factor),
- gpmi_regs + HW_GPMI_CTRL1_SET);
+ writel(reg, gpmi_regs + HW_GPMI_CTRL1_SET);
- /* Enable the DLL. */
+ /* At last, we enable the DLL. */
writel(BM_GPMI_CTRL1_DLL_ENABLE, gpmi_regs + HW_GPMI_CTRL1_SET);
/*
* After we enable the GPMI DLL, we have to wait 64 clock cycles before
- * we can use the GPMI.
- *
- * Calculate the amount of time we need to wait, in microseconds.
+ * we can use the GPMI. Calculate the amount of time we need to wait,
+ * in microseconds.
*/
clock_period_in_ns = NSEC_PER_SEC / clk_get_rate(r->clock[0]);
dll_wait_time_in_us = (clock_period_in_ns * 64) / 1000;