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| author | Michal Simek <michal.simek@xilinx.com> | 2013-03-20 11:42:15 +0100 |
|---|---|---|
| committer | Michal Simek <michal.simek@xilinx.com> | 2013-04-04 09:22:29 +0200 |
| commit | 96790f0a283976bc59f68657237293fe97b02334 (patch) | |
| tree | 9d15142ec7d3c6b7acecabcd2a686051cf733af0 /arch/arm/mach-zynq/slcr.c | |
| parent | arm: zynq: Move slcr initialization to separate file (diff) | |
| download | linux-96790f0a283976bc59f68657237293fe97b02334.tar.xz linux-96790f0a283976bc59f68657237293fe97b02334.zip | |
arm: zynq: Add support for system reset
Do system reset via slcr registers.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'arch/arm/mach-zynq/slcr.c')
| -rw-r--r-- | arch/arm/mach-zynq/slcr.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/arm/mach-zynq/slcr.c b/arch/arm/mach-zynq/slcr.c index f9f33496cee9..d58c9964e883 100644 --- a/arch/arm/mach-zynq/slcr.c +++ b/arch/arm/mach-zynq/slcr.c @@ -32,9 +32,36 @@ #define SLCR_UNLOCK_MAGIC 0xDF0D #define SLCR_UNLOCK 0x8 /* SCLR unlock register */ +#define SLCR_PS_RST_CTRL_OFFSET 0x200 /* PS Software Reset Control */ +#define SLCR_REBOOT_STATUS 0x258 /* PS Reboot Status */ + void __iomem *zynq_slcr_base; /** + * zynq_slcr_system_reset - Reset the entire system. + */ +void zynq_slcr_system_reset(void) +{ + u32 reboot; + + /* + * Unlock the SLCR then reset the system. + * Note that this seems to require raw i/o + * functions or there's a lockup? + */ + writel(SLCR_UNLOCK_MAGIC, zynq_slcr_base + SLCR_UNLOCK); + + /* + * Clear 0x0F000000 bits of reboot status register to workaround + * the FSBL not loading the bitstream after soft-reboot + * This is a temporary solution until we know more. + */ + reboot = readl(zynq_slcr_base + SLCR_REBOOT_STATUS); + writel(reboot & 0xF0FFFFFF, zynq_slcr_base + SLCR_REBOOT_STATUS); + writel(1, zynq_slcr_base + SLCR_PS_RST_CTRL_OFFSET); +} + +/** * zynq_slcr_init * Returns 0 on success, negative errno otherwise. * |