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/drivers/misc/k3_esm.c b/drivers/misc/k3_esm.c
new file mode 100644
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,
+};