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ARM: tegra: add PCI Express power gating 

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Colin Cross <ccross@android.com>
This commit is contained in:
Mike Rapoport 2011-03-02 14:34:05 +02:00 committed by Colin Cross
parent 1e40a97e6c
commit b96cc7fe19
1 changed files with 20 additions and 2 deletions
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22
arch/arm/mach-tegra/pcie.c
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@ -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;