misc: k3_esm: Add support for Texas Instruments K3 ESM driver

The ESM (Error Signaling Module) is used to route error signals within
the K3 SoCs somewhat similar to interrupts. The handling for these is
different though, and can be routed for hardware error handling, to
be handled by safety processor or just as error interrupts handled
by the main processor. The u-boot level ESM driver is just used to
configure the ESM signals so that they get routed to proper destination.

Signed-off-by: Tero Kristo <t-kristo@ti.com>

diff --git a/doc/device-tree-bindings/misc/esm-k3.txt b/doc/device-tree-bindings/misc/esm-k3.txt
new file mode 100644 (file)
index 0000000..01c8b6b
--- /dev/null
+++ b/doc/device-tree-bindings/misc/esm-k3.txt
@@ -0,0 +1,25 @@
+Texas Instruments K3 ESM Binding
+======================
+
+ESM (Error Signaling Module) is an IP block on TI K3 devices that allows
+handling of safety events somewhat similar to what interrupt controller
+would do. The safety signals have their separate paths within the SoC,
+and they are handled by the ESM, which routes them to the proper
+destination, which can be system reset, interrupt controller, etc. In
+the simplest configuration the signals are just routed to reset the
+SoC.
+
+Required properties :
+- compatible   : "ti,j721e-esm"
+- ti,esm-pins  : integer array of esm events IDs to route to external event
+                 pin which can be used to reset the SoC. The array can
+                 have arbitrary amount of event IDs listed on it.
+
+Example
+=======
+
+       main_esm: esm@700000 {
+               compatible = "ti,j721e-esm";
+               reg = <0x0 0x700000 0x0 0x1000>;
+               ti,esm-pins = <344>, <345>;
+       };

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index f18aa8f7ba930e5ae256e9c88e7cda49f5eff4a0..38588b2cbd8b5eb85bc82ec3b37a4669639c56b5 100644 (file)
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -462,6 +462,11 @@ config IHS_FPGA
          gdsys devices, which supply the majority of the functionality offered
          by the devices. This driver supports both CON and CPU variants of the
          devices, depending on the device tree entry.
+config ESM_K3
+       bool "Enable K3 ESM driver"
+       depends on ARCH_K3
+       help
+         Support ESM (Error Signaling Module) on TI K3 SoCs.
 
 config MICROCHIP_FLEXCOM
        bool "Enable Microchip Flexcom driver"

diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 2b843de93ceb823eef41b70ef43207b7c5909387..60406c3e0a309e3d65088b24ba60d9fff9e38d5e 100644 (file)
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -72,3 +72,4 @@ obj-$(CONFIG_WINBOND_W83627) += winbond_w83627.o
 obj-$(CONFIG_JZ4780_EFUSE) += jz4780_efuse.o
 obj-$(CONFIG_MICROCHIP_FLEXCOM) += microchip_flexcom.o
 obj-$(CONFIG_K3_AVS0) += k3_avs.o
+obj-$(CONFIG_ESM_K3) += k3_esm.o

diff --git a/drivers/misc/k3_esm.c b/drivers/misc/k3_esm.c
new file mode 100644 (file)
index 0000000..8f270f3
--- /dev/null
+++ b/drivers/misc/k3_esm.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Texas Instruments' K3 Error Signalling Module driver
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
+ *      Tero Kristo <t-kristo@ti.com>
+ *
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <dm/device_compat.h>
+
+#define ESM_SFT_RST                    0x0c
+#define ESM_SFT_RST_KEY                        0x0f
+
+#define ESM_STS(i)                     (0x404 + (i) / 32 * 0x20)
+#define ESM_PIN_EN_SET_OFFSET(i)       (0x414 + (i) / 32 * 0x20)
+#define ESM_PIN_MASK(i)                        BIT((i) & 0x1f)
+
+static void esm_pin_enable(void __iomem *base, int pin)
+{
+       /* Enable event */
+       writel(ESM_PIN_MASK(pin), base + ESM_PIN_EN_SET_OFFSET(pin));
+}
+
+/**
+ * k3_esm_probe: configures ESM based on DT data
+ *
+ * Parses ESM info from device tree, and configures the module accordingly.
+ */
+static int k3_esm_probe(struct udevice *dev)
+{
+       int ret;
+       void __iomem *base;
+       int num_pins;
+       u32 *pins;
+       int i;
+
+       base = dev_remap_addr_index(dev, 0);
+       if (!base)
+               return -ENODEV;
+
+       num_pins = dev_read_size(dev, "ti,esm-pins");
+       if (num_pins < 0) {
+               dev_err(dev, "ti,esm-pins property missing or invalid: %d\n",
+                       num_pins);
+               return num_pins;
+       }
+
+       num_pins /= sizeof(u32);
+
+       pins = kmalloc(num_pins * sizeof(u32), __GFP_ZERO);
+       if (!pins)
+               return -ENOMEM;
+
+       ret = dev_read_u32_array(dev, "ti,esm-pins", pins, num_pins);
+       if (ret < 0) {
+               dev_err(dev, "failed to read ti,esm-pins property: %d\n",
+                       ret);
+               goto free_pins;
+       }
+
+       /* Clear any pending events */
+       writel(ESM_SFT_RST_KEY, base + ESM_SFT_RST);
+
+       for (i = 0; i < num_pins; i++)
+               esm_pin_enable(base, pins[i]);
+
+free_pins:
+       kfree(pins);
+       return ret;
+}
+
+static const struct udevice_id k3_esm_ids[] = {
+       { .compatible = "ti,j721e-esm" },
+       {}
+};
+
+U_BOOT_DRIVER(k3_esm) = {
+       .name = "k3_esm",
+       .of_match = k3_esm_ids,
+       .id = UCLASS_MISC,
+       .probe = k3_esm_probe,
+};