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authorMike Rapoport <mike@compulab.co.il>2011-03-09 16:31:17 +0200
committerOlof Johansson <olof@lixom.net>2011-03-15 14:28:32 -0700
commitce005cf450b2c1c93e48c45a4cc717e9d104c054 (patch)
tree8d126ded2fe89176c0421cf1bb9ea289bec313ee /arch/arm/mach-tegra/board-harmony-pcie.c
parentc4d9e4a0b9960fbf4d945bdad47ba005abe8813c (diff)
downloadblackbird-op-linux-ce005cf450b2c1c93e48c45a4cc717e9d104c054.tar.gz
blackbird-op-linux-ce005cf450b2c1c93e48c45a4cc717e9d104c054.zip
ARM: tegra: harmony: update PCI-e initialization sequence
On Harmony board PCI-e subsystem can be enabled only after certain voltage regulators are on. One of the regulators is an internal regulator on the PMIC and another one is controlled by a PMIC GPIO. Addition of the voltage control to the Harmony PCI-e initialization allows booting of kernel with CONFIG_TEGRA_PCI even if the PMIC driver is not loaded. In this case the PCI-e initialization will fail gracefully intead of hanging the system. Signed-off-by: Mike Rapoport <mike@compulab.co.il> Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-tegra/board-harmony-pcie.c')
-rw-r--r--arch/arm/mach-tegra/board-harmony-pcie.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/arch/arm/mach-tegra/board-harmony-pcie.c b/arch/arm/mach-tegra/board-harmony-pcie.c
index f7e7d4514b6a..9c27b95b8d86 100644
--- a/arch/arm/mach-tegra/board-harmony-pcie.c
+++ b/arch/arm/mach-tegra/board-harmony-pcie.c
@@ -27,13 +27,29 @@
#ifdef CONFIG_TEGRA_PCI
+/* GPIO 3 of the PMIC */
+#define EN_VDD_1V05_GPIO (TEGRA_NR_GPIOS + 2)
+
static int __init harmony_pcie_init(void)
{
+ struct regulator *regulator = NULL;
int err;
if (!machine_is_harmony())
return 0;
+ err = gpio_request(EN_VDD_1V05_GPIO, "EN_VDD_1V05");
+ if (err)
+ return err;
+
+ gpio_direction_output(EN_VDD_1V05_GPIO, 1);
+
+ regulator = regulator_get(NULL, "pex_clk");
+ if (IS_ERR_OR_NULL(regulator))
+ goto err_reg;
+
+ regulator_enable(regulator);
+
tegra_pinmux_set_tristate(TEGRA_PINGROUP_GPV, TEGRA_TRI_NORMAL);
tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXA, TEGRA_TRI_NORMAL);
tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXK, TEGRA_TRI_NORMAL);
@@ -49,9 +65,15 @@ err_pcie:
tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXA, TEGRA_TRI_TRISTATE);
tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXK, TEGRA_TRI_TRISTATE);
+ regulator_disable(regulator);
+ regulator_put(regulator);
+err_reg:
+ gpio_free(EN_VDD_1V05_GPIO);
+
return err;
}
-subsys_initcall(harmony_pcie_init);
+/* PCI should be initialized after I2C, mfd and regulators */
+subsys_initcall_sync(harmony_pcie_init);
#endif
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