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zynq: slcr: Disable all level shifters

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Disable all level shifters before enabling
the PS-to-PL level shifters as it would
be good to disable all level shifters before
enabling the PS-to-PL in order to ensure that
it is in proper state

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Siva Durga Prasad Paladugu 2015-03-02 16:03:46 +05:30 committed by Michal Simek
parent e7fa7d5c73
commit f25f552aab
1 changed files with 7 additions and 0 deletions
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7
arch/arm/cpu/armv7/zynq/slcr.c
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@ -129,11 +129,18 @@ out:
void zynq_slcr_devcfg_disable(void)
{
u32 reg_val;
zynq_slcr_unlock();
/* Disable AXI interface by asserting FPGA resets */
writel(0xF, &slcr_base->fpga_rst_ctrl);
/* Disable Level shifters before setting PS-PL */
reg_val = readl(&slcr_base->lvl_shftr_en);
reg_val &= ~0xF;
writel(reg_val, &slcr_base->lvl_shftr_en);
/* Set Level Shifters DT618760 */
writel(0xA, &slcr_base->lvl_shftr_en);