sysreset: Add Atmel/Microchip sysreset driver

This patch adds a sysreset driver for Atmel/Microchip platforms.

Signed-off-by: Sergiu Moga <sergiu.moga@microchip.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>

diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index f6d60038b897307cac940d87de82d6c3bf56c5e8..25dd02c704987af3d976aa1c08bf63cd26db15ba 100644 (file)
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -77,6 +77,21 @@ config SYSRESET_OCTEON
          This enables the system reset driver support for Marvell Octeon
          SoCs.
 
+config SYSRESET_AT91
+       bool "Enable support for Microchip/Atmel reset driver"
+       depends on ARCH_AT91
+       select SYSRESET_SPL_AT91 if SPL && SPL_SYSRESET
+       help
+         This enables the system reset driver support for Microchip/Atmel
+         SoCs.
+
+config SYSRESET_SPL_AT91
+       bool "Enable support for Microchip/Atmel reset driver in SPL"
+       depends on ARCH_AT91
+       help
+         This enables the system reset driver support for Microchip/Atmel
+         SoCs in SPL.
+
 config SYSRESET_PSCI
        bool "Enable support for PSCI System Reset"
        depends on ARM_PSCI_FW

diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile
index 8e00be07794a5f973dc906e7532fb8f82b2ff6a2..0ed3bbf356a35f799e3cf2c27592ad754a8a29eb 100644 (file)
--- a/drivers/sysreset/Makefile
+++ b/drivers/sysreset/Makefile
@@ -20,5 +20,6 @@ obj-$(CONFIG_SYSRESET_TI_SCI) += sysreset-ti-sci.o
 obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o
 obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o
 obj-$(CONFIG_SYSRESET_RESETCTL) += sysreset_resetctl.o
+obj-$(CONFIG_SYSRESET_$(SPL_TPL_)AT91) += sysreset_at91.o
 obj-$(CONFIG_$(SPL_TPL_)SYSRESET_X86) += sysreset_x86.o
 obj-$(CONFIG_TARGET_XTFPGA) += sysreset_xtfpga.o

diff --git a/drivers/sysreset/sysreset_at91.c b/drivers/sysreset/sysreset_at91.c
new file mode 100644 (file)
index 0000000..24b87ee
--- /dev/null
+++ b/drivers/sysreset/sysreset_at91.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries
+ */
+
+#include <asm/arch/hardware.h>
+#include <asm/io.h>
+#include <asm/arch/at91_rstc.h>
+#include <clk.h>
+#include <common.h>
+#include <cpu_func.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <dm/device-internal.h>
+#include <sysreset.h>
+
+static int at91_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+       at91_rstc_t *rstc = (at91_rstc_t *)dev_get_priv(dev);
+
+       writel(AT91_RSTC_KEY
+               | AT91_RSTC_CR_PROCRST  /* Processor Reset */
+               | AT91_RSTC_CR_PERRST   /* Peripheral Reset */
+#ifdef CONFIG_AT91RESET_EXTRST
+               | AT91_RSTC_CR_EXTRST   /* External Reset (assert nRST pin) */
+#endif
+               , &rstc->cr);
+
+       return -EINPROGRESS;
+}
+
+static int at91_sysreset_probe(struct udevice *dev)
+{
+       struct clk slck;
+       void *priv;
+       int ret;
+
+       priv = dev_remap_addr(dev);
+       if (!priv)
+               return -EINVAL;
+
+       dev_set_priv(dev, priv);
+
+       ret = clk_get_by_index(dev, 0, &slck);
+       if (ret)
+               return ret;
+
+       ret = clk_prepare_enable(&slck);
+       if (ret)
+               return ret;
+
+       return 0;
+}
+
+static struct sysreset_ops at91_sysreset = {
+       .request = at91_sysreset_request,
+};
+
+static const struct udevice_id a91_sysreset_ids[] = {
+       { .compatible = "atmel,sama5d3-rstc" },
+       { .compatible = "microchip,sam9x60-rstc" },
+       { }
+};
+
+U_BOOT_DRIVER(sysreset_at91) = {
+       .id     = UCLASS_SYSRESET,
+       .name   = "at91_reset",
+       .ops    = &at91_sysreset,
+       .probe  = at91_sysreset_probe,
+       .of_match = a91_sysreset_ids,
+};