diff options
| author | Allen Xu <allen.xu@freescale.com> | 2012-04-10 11:37:37 +0800 |
|---|---|---|
| committer | Allen Xu <allen.xu@freescale.com> | 2012-04-11 10:13:00 +0800 |
| commit | 38eaf3e609c028b40c2e364703f6e98e656912c8 (patch) | |
| tree | d6010569a8efaf2b79256f78b80f7db86c9387f8 /drivers/mtd | |
| parent | 3e325954714f21a66fba38816de1c5f76403b47a (diff) | |
ENGR00177241-2 mx6 close APBH DMA clock when no I/O operation
When there is no NAND I/O operation, close all the reference
clock, include GPMI,BCH and APBH clock.
Signed-off-by: Allen Xu <allen.xu@freescale.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/gpmi-nand/gpmi-lib.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c index 698535773ff4..e87b2026fc87 100644 --- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c +++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c @@ -22,11 +22,14 @@ #include <linux/delay.h> #include <linux/clk.h> #include <mach/mxs.h> +#include <mach/clock.h> #include "gpmi-nand.h" #include "gpmi-regs.h" #include "bch-regs.h" +static struct clk *mxs_dma_clk; + struct timing_threshod timing_default_threshold = { .max_data_setup_cycles = (BM_GPMI_TIMING0_DATA_SETUP >> BP_GPMI_TIMING0_DATA_SETUP), @@ -128,6 +131,12 @@ int gpmi_init(struct gpmi_nand_data *this) struct resources *r = &this->resources; int ret; + mxs_dma_clk = clk_get(NULL, "mxs-dma-apbh"); + if (IS_ERR(mxs_dma_clk)) { + pr_err("can not get the dma clock\n"); + ret = -ENOENT; + goto err_out; + } ret = clk_prepare_enable(r->clock); if (ret) goto err_out; @@ -719,6 +728,13 @@ void gpmi_begin(struct gpmi_nand_data *this) pr_err("We failed in enable the clk\n"); goto err_out; } + if (!clk_get_usecount(mxs_dma_clk)) { + ret = clk_prepare_enable(mxs_dma_clk); + if (ret) { + pr_err("We failed in enable the dma clk\n"); + goto err_out; + } + } /* set ready/busy timeout */ writel(0x500 << BP_GPMI_TIMING1_BUSY_TIMEOUT, @@ -784,6 +800,8 @@ void gpmi_end(struct gpmi_nand_data *this) { struct resources *r = &this->resources; clk_disable_unprepare(r->clock); + if (clk_get_usecount(mxs_dma_clk)) + clk_disable_unprepare(mxs_dma_clk); } /* Clears a BCH interrupt. */ |