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ARM: tegra: export apb dma readl/writel

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Export APB DMA readl and writel. These are needed because we can't
access the fuses directly on Tegra20 without potentially causing a
system hang. Also have the APB DMA readl and writel return an error in
case of a read failure instead of just returning zero or ignore write
failures.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Peter De Schrijver
2014-06-12 18:36:35 +03:00
committed by Thierry Reding
parent 304664eab9
commit 3f394f8064
2 changed files with 45 additions and 20 deletions
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14
include/soc/tegra/fuse.h
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@@ -27,6 +27,20 @@
u32 tegra_read_chipid(void);
u8 tegra_get_chip_id(void);
#if defined(CONFIG_TEGRA20_APB_DMA)
int tegra_apb_readl_using_dma(unsigned long offset, u32 *value);
int tegra_apb_writel_using_dma(u32 value, unsigned long offset);
#else
static inline int tegra_apb_readl_using_dma(unsigned long offset, u32 *value)
{
return -EINVAL;
}
static inline int tegra_apb_writel_using_dma(u32 value, unsigned long offset)
{
return -EINVAL;
}
#endif /* CONFIG_TEGRA20_APB_DMA */
#endif /* __ASSEMBLY__ */
#endif /* __SOC_TEGRA_FUSE_H__ */