diff options
| author | Laxman Dewangan <ldewangan@nvidia.com> | 2013-04-23 21:17:14 +0530 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2013-09-14 13:17:40 -0700 |
| commit | 930099077848ffa494f397287bf3d407fc8a71c3 (patch) | |
| tree | 0ab7fcdf652a979cbac890d6a36ba4d27188712d /drivers/dma | |
| parent | f374ab92a58b03835fc09d9d7aaba1b8161e13e8 (diff) | |
dma: tegra: implement suspend/resume callbacks
Implement suspend/resume callbacks to store channel register
on suspend and restore channel register on resume.
bug 1323103
Change-Id: I55548701d08d4325f661502c62815747264e7196
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/222118
(cherry picked from commit 2d0f1556f16688ab7a4bd5d1b99034dee6d1321c)
Signed-off-by: Ajay Nandakumar <anandakumarm@nvidia.com>
Reviewed-on: http://git-master/r/247131
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Dan Willemsen <dwillemsen@nvidia.com>
Tested-by: Dan Willemsen <dwillemsen@nvidia.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/tegra20-apb-dma.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index a2a1700ffe0d..f6b7e356c1a3 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -30,6 +30,7 @@ #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> +#include <linux/pm.h> #include <linux/pm_runtime.h> #include <linux/slab.h> #include <linux/clk/tegra.h> @@ -200,6 +201,7 @@ struct tegra_dma_channel { /* Channel-slave specific configuration */ struct dma_slave_config dma_sconfig; + struct tegra_dma_channel_regs channel_reg; }; /* tegra_dma: Tegra DMA specific information */ @@ -1450,11 +1452,74 @@ static int tegra_dma_runtime_resume(struct device *dev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int tegra_dma_pm_suspend(struct device *dev) +{ + struct tegra_dma *tdma = dev_get_drvdata(dev); + int i; + int ret; + + ret = tegra_dma_runtime_resume(dev); + if (ret < 0) + return ret; + + tdma->reg_gen = tdma_read(tdma, TEGRA_APBDMA_GENERAL); + for (i = 0; i < tdma->chip_data->nr_channels; i++) { + struct tegra_dma_channel *tdc = &tdma->channels[i]; + struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg; + + ch_reg->csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR); + ch_reg->ahb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBPTR); + ch_reg->apb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBPTR); + ch_reg->ahb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBSEQ); + ch_reg->apb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBSEQ); + if (tdc->tdma->chip_data->support_separate_wcount_reg) + ch_reg->wcount = + tdc_read(tdc, TEGRA_APBDMA_CHAN_WCOUNT); + } + tegra_dma_runtime_suspend(dev); + return 0; +} + +static int tegra_dma_pm_resume(struct device *dev) +{ + struct tegra_dma *tdma = dev_get_drvdata(dev); + int i; + int ret; + + ret = tegra_dma_runtime_resume(dev); + if (ret < 0) + return ret; + + tdma_write(tdma, TEGRA_APBDMA_GENERAL, tdma->reg_gen); + tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0); + tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFFul); + + for (i = 0; i < tdma->chip_data->nr_channels; i++) { + struct tegra_dma_channel *tdc = &tdma->channels[i]; + struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg; + + if (tdc->tdma->chip_data->support_separate_wcount_reg) + tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT, + ch_reg->wcount); + tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_reg->apb_seq); + tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_reg->apb_ptr); + tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_reg->ahb_seq); + tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, ch_reg->ahb_ptr); + tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, + (ch_reg->csr & ~TEGRA_APBDMA_CSR_ENB)); + } + tegra_dma_runtime_suspend(dev); + return 0; +} +#endif + static const struct dev_pm_ops tegra_dma_dev_pm_ops = { #ifdef CONFIG_PM_RUNTIME .runtime_suspend = tegra_dma_runtime_suspend, .runtime_resume = tegra_dma_runtime_resume, #endif + SET_SYSTEM_SLEEP_PM_OPS(tegra_dma_pm_suspend, tegra_dma_pm_resume) }; static struct platform_driver tegra_dmac_driver = { |