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| author | Soren Brinkmann <soren.brinkmann@xilinx.com> | 2014-04-17 20:40:52 +0200 |
|---|---|---|
| committer | Michal Simek <michal.simek@xilinx.com> | 2014-04-22 13:10:18 +0200 |
| commit | 9268beb5c2301b6651f0cc78734a1c0d15b3fcb1 (patch) | |
| tree | f0466b0b0a258996642c4a5d6b1967de8c2cc6ed /drivers/clk/zynq/clkc.c | |
| parent | Linux 3.15-rc1 (diff) | |
| download | linux-9268beb5c2301b6651f0cc78734a1c0d15b3fcb1.tar.xz linux-9268beb5c2301b6651f0cc78734a1c0d15b3fcb1.zip | |
clk: zynq: Leave debug clocks in bootup state
Make sure debug clocks stay enabled if the bootloader enabled them.
Otherwise debug HW may crash due to bus-hangs caused by stopped clocks.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'drivers/clk/zynq/clkc.c')
| -rw-r--r-- | drivers/clk/zynq/clkc.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/clk/zynq/clkc.c b/drivers/clk/zynq/clkc.c index 52c09afdcfb7..246cf1226eaa 100644 --- a/drivers/clk/zynq/clkc.c +++ b/drivers/clk/zynq/clkc.c @@ -53,6 +53,9 @@ static void __iomem *zynq_clkc_base; #define NUM_MIO_PINS 54 +#define DBG_CLK_CTRL_CLKACT_TRC BIT(0) +#define DBG_CLK_CTRL_CPU_1XCLKACT BIT(1) + enum zynq_clk { armpll, ddrpll, iopll, cpu_6or4x, cpu_3or2x, cpu_2x, cpu_1x, @@ -499,6 +502,15 @@ static void __init zynq_clk_setup(struct device_node *np) clk_output_name[cpu_1x], 0, SLCR_DBG_CLK_CTRL, 1, 0, &dbgclk_lock); + /* leave debug clocks in the state the bootloader set them up to */ + tmp = clk_readl(SLCR_DBG_CLK_CTRL); + if (tmp & DBG_CLK_CTRL_CLKACT_TRC) + if (clk_prepare_enable(clks[dbg_trc])) + pr_warn("%s: trace clk enable failed\n", __func__); + if (tmp & DBG_CLK_CTRL_CPU_1XCLKACT) + if (clk_prepare_enable(clks[dbg_apb])) + pr_warn("%s: debug APB clk enable failed\n", __func__); + /* One gated clock for all APER clocks. */ clks[dma] = clk_register_gate(NULL, clk_output_name[dma], clk_output_name[cpu_2x], 0, SLCR_APER_CLK_CTRL, 0, 0, |