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rockchip: rk3399-puma: add code to allow forcing a power-on reset
The reset circuitry in the RK3399 only resets 'almost all logic' when a software reset is performed. To make our software maintenance easier in the future, we want to have the option (controlled by a DTS property) to force all reset causes other than a power-on reset to trigger a power-on reset via a GPIO trigger. This adds the necessary support to the rk3399-puma (i.e. RK3399-Q7) board-support and the documentation for the new property (sysreset-gpio) within the /config-node. Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com> Reviewed-by: Simon Glass <sjg@chromium.org>
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@ -11,7 +11,10 @@
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#include <usb.h>
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#include <dm/pinctrl.h>
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#include <dm/uclass-internal.h>
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#include <asm/gpio.h>
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#include <asm/setup.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/cru_rk3399.h>
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#include <asm/arch/periph.h>
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#include <power/regulator.h>
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#include <u-boot/sha256.h>
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@ -33,9 +36,50 @@ int board_init(void)
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return 0;
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}
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static void rk3399_force_power_on_reset(void)
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{
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ofnode node;
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struct gpio_desc sysreset_gpio;
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debug("%s: trying to force a power-on reset\n", __func__);
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node = ofnode_path("/config");
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if (!ofnode_valid(node)) {
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debug("%s: no /config node?\n", __func__);
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return;
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}
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if (gpio_request_by_name_nodev(node, "sysreset-gpio", 0,
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&sysreset_gpio, GPIOD_IS_OUT)) {
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debug("%s: could not find a /config/sysreset-gpio\n", __func__);
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return;
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}
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dm_gpio_set_value(&sysreset_gpio, 1);
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}
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void spl_board_init(void)
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{
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int ret;
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struct rk3399_cru *cru = rockchip_get_cru();
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/*
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* The RK3399 resets only 'almost all logic' (see also in the TRM
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* "3.9.4 Global software reset"), when issuing a software reset.
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* This may cause issues during boot-up for some configurations of
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* the application software stack.
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*
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* To work around this, we test whether the last reset reason was
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* a power-on reset and (if not) issue an overtemp-reset to reset
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* the entire module.
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*
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* While this was previously fixed by modifying the various places
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* that could generate a software reset (e.g. U-Boot's sysreset
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* driver, the ATF or Linux), we now have it here to ensure that
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* we no longer have to track this through the various components.
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*/
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if (cru->glb_rst_st != 0)
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rk3399_force_power_on_reset();
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/*
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* Turning the eMMC and SPI back on (if disabled via the Qseven
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@ -46,3 +46,9 @@ u-boot,spl-payload-offset
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If present (and SPL is controlled by the device-tree), this allows
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to override the CONFIG_SYS_SPI_U_BOOT_OFFS setting using a value
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from the device-tree.
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sysreset-gpio
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If present (and supported by the specific board), indicates a
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GPIO that can be set to trigger a system reset. It is assumed
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that such a system reset will effect a complete platform reset,
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being roughly equivalent to a power-on reset.
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