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| author | Mike Rapoport <mike@compulab.co.il> | 2011-03-02 13:34:05 +0100 |
|---|---|---|
| committer | Colin Cross <ccross@android.com> | 2011-03-03 22:57:07 +0100 |
| commit | b96cc7fe190b9356633c70afae61ee0637b000ee (patch) | |
| tree | 096c2873246959cda73578485fba22297c2d9daf /arch/arm/mach-tegra/pcie.c | |
| parent | ARM: tegra: PCIE minor code refactoring (diff) | |
| download | linux-b96cc7fe190b9356633c70afae61ee0637b000ee.tar.xz linux-b96cc7fe190b9356633c70afae61ee0637b000ee.zip | |
ARM: tegra: add PCI Express power gating
Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Colin Cross <ccross@android.com>
Diffstat (limited to 'arch/arm/mach-tegra/pcie.c')
| -rw-r--r-- | arch/arm/mach-tegra/pcie.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/arch/arm/mach-tegra/pcie.c b/arch/arm/mach-tegra/pcie.c index 6de5ef47c027..2941212b853c 100644 --- a/arch/arm/mach-tegra/pcie.c +++ b/arch/arm/mach-tegra/pcie.c @@ -39,6 +39,7 @@ #include <mach/pinmux.h> #include <mach/iomap.h> #include <mach/clk.h> +#include <mach/powergate.h> /* register definitions */ #define AFI_OFFSET 0x3800 @@ -688,13 +689,30 @@ static void tegra_pcie_power_off(void) tegra_periph_reset_assert(tegra_pcie.afi_clk); tegra_periph_reset_assert(tegra_pcie.pex_clk); + tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); tegra_pcie_xclk_clamp(true); } -static int tegra_pcie_power_on(void) +static int tegra_pcie_power_regate(void) { + int err; + + tegra_pcie_power_off(); + tegra_pcie_xclk_clamp(true); + tegra_periph_reset_assert(tegra_pcie.pcie_xclk); + tegra_periph_reset_assert(tegra_pcie.afi_clk); + + err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE, + tegra_pcie.pex_clk); + if (err) { + pr_err("PCIE: powerup sequence failed: %d\n", err); + return err; + } + + tegra_periph_reset_deassert(tegra_pcie.afi_clk); + tegra_pcie_xclk_clamp(false); clk_enable(tegra_pcie.afi_clk); @@ -759,7 +777,7 @@ static int __init tegra_pcie_get_resources(void) return err; } - err = tegra_pcie_power_on(); + err = tegra_pcie_power_regate(); if (err) { pr_err("PCIE: failed to power up: %d\n", err); goto err_pwr_on; |