diff options
| author | Huang Shijie <b32955@freescale.com> | 2010-11-25 13:56:41 +0800 |
|---|---|---|
| committer | Huang Shijie <b32955@freescale.com> | 2010-11-30 14:56:49 +0800 |
| commit | 3f067c53b2bad6f5a64f3fa2dcdf978c21ea0157 (patch) | |
| tree | d5a13da021f005d12bedc2976c4ba753c76b661f /drivers | |
| parent | 89d6eeb323002990ed28d723634ed2e277d8ed47 (diff) | |
ENGR00134048 GPMI: Need more clocks in LPM mode on MX508
In the low power mode, we need to enable the apbh_dma_clk and
ahb_max_clk which are needed by DMA module
Signed-off-by: Huang Shijie <b32955@freescale.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/nand/gpmi-nfc/gpmi-nfc-hal-v2.c | 38 |
1 files changed, 32 insertions, 6 deletions
diff --git a/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-hal-v2.c b/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-hal-v2.c index 0a9c3d62b07b..2c4fb264ba34 100644 --- a/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-hal-v2.c +++ b/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-hal-v2.c @@ -33,11 +33,19 @@ static int onfi_ddr_mode; /* - * In low-power mode, the system will shutdown the ddr_clk which is needed - * by the DMA. + * How many clocks do we need in low power mode? + * We try to list them : + * GMPI : gpmi_apb_clk, gpmi_io_clk + * BCH : bch_clk, bch_apb_clk + * DMA(RAM) : apbh_dma_clk, ddr_clk(RAM), ahb_max_clk(RAM) + * (APBHDMA fetches DMA descriptors from DDR + * through AHB-MAX/PL301) + * NAND : + * ONFI NAND : pll1_main_clk */ static struct clk *ddr_clk; - +static struct clk *apbh_dma_clk; +static struct clk *ahb_max_clk; static void setup_ddr_timing(struct gpmi_nfc_data *this) { @@ -206,9 +214,22 @@ static int extra_init(struct gpmi_nfc_data *this) ddr_clk = NULL; return -ENOENT; } + apbh_dma_clk = clk_get(NULL, "apbh_dma_clk"); + if (IS_ERR(apbh_dma_clk)) { + printk(KERN_ERR "The APBH_DMA clock is gone!"); + apbh_dma_clk = NULL; + return -ENOENT; + } + ahb_max_clk = clk_get(NULL, "ahb_max_clk"); + if (IS_ERR(ahb_max_clk)) { + printk(KERN_ERR "The APBH_DMA clock is gone!"); + ahb_max_clk = NULL; + return -ENOENT; + } if (is_onfi_nand(&this->device_info)) return enable_micron_ddr(this); + return 0; } @@ -455,6 +476,10 @@ static void begin(struct gpmi_nfc_data *this) if (ddr_clk) clk_enable(ddr_clk); + if (apbh_dma_clk) + clk_enable(apbh_dma_clk); + if (ahb_max_clk) + clk_enable(ahb_max_clk); clk_enable(resources->clock); /* Get the timing information we need. */ @@ -477,12 +502,13 @@ static void end(struct gpmi_nfc_data *this) { struct resources *resources = &this->resources; - /* Disable the clock. */ - clk_disable(resources->clock); + if (ahb_max_clk) + clk_disable(ahb_max_clk); + if (apbh_dma_clk) + clk_disable(apbh_dma_clk); if (ddr_clk) clk_disable(ddr_clk); - } /** |