diff options
| author | Andrew Lunn <andrew@lunn.ch> | 2012-03-09 00:45:59 +0400 |
|---|---|---|
| committer | Mike Turquette <mturquette@linaro.org> | 2012-05-09 03:34:02 +0400 |
| commit | 27e53cfbce493bb062212263aa24bbbc5a1077f4 (patch) | |
| tree | a017e6bcfa6f5ebeb152475c8b3b19fefd73b902 /arch/arm/mach-kirkwood/pcie.c | |
| parent | c510182b1c68e2f2bf61e69f6c65bcf61a188809 (diff) | |
| download | linux-27e53cfbce493bb062212263aa24bbbc5a1077f4.tar.xz | |
ARM: Orion: PCIE: Add support for clk
Prepare and enable the clocks when the board indicates the pcie buses
will be used.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'arch/arm/mach-kirkwood/pcie.c')
| -rw-r--r-- | arch/arm/mach-kirkwood/pcie.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm/mach-kirkwood/pcie.c b/arch/arm/mach-kirkwood/pcie.c index f56a0118c1bb..881933a0b5eb 100644 --- a/arch/arm/mach-kirkwood/pcie.c +++ b/arch/arm/mach-kirkwood/pcie.c @@ -11,6 +11,7 @@ #include <linux/kernel.h> #include <linux/pci.h> #include <linux/slab.h> +#include <linux/clk.h> #include <video/vga.h> #include <asm/irq.h> #include <asm/mach/pci.h> @@ -19,6 +20,23 @@ #include <plat/addr-map.h> #include "common.h" +static void kirkwood_enable_pcie_clk(const char *port) +{ + struct clk *clk; + + clk = clk_get_sys("pcie", port); + if (IS_ERR(clk)) { + printk(KERN_ERR "PCIE clock %s missing\n", port); + return; + } + clk_prepare_enable(clk); + clk_put(clk); +} + +/* This function is called very early in the boot when probing the + hardware to determine what we actually are, and what rate tclk is + ticking at. Hence calling kirkwood_enable_pcie_clk() is not + possible since the clk tree has not been created yet. */ void kirkwood_enable_pcie(void) { u32 curr = readl(CLOCK_GATING_CTRL); @@ -183,10 +201,12 @@ static int __init kirkwood_pcie_setup(int nr, struct pci_sys_data *sys) switch (index) { case 0: kirkwood_clk_ctrl |= CGC_PEX0; + kirkwood_enable_pcie_clk("0"); pcie0_ioresources_init(pp); break; case 1: kirkwood_clk_ctrl |= CGC_PEX1; + kirkwood_enable_pcie_clk("1"); pcie1_ioresources_init(pp); break; default: |