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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Texas Instruments' K3 Remoteproc driver
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+ *
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+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
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+ * Lokesh Vutla <lokeshvutla@ti.com>
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+ *
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+ */
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+
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+#include <common.h>
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+#include <dm.h>
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+#include <remoteproc.h>
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+#include <errno.h>
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+#include <clk.h>
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+#include <reset.h>
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+#include <asm/io.h>
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+#include <power-domain.h>
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+#include <linux/soc/ti/ti_sci_protocol.h>
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+
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+#define INVALID_ID 0xffff
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+
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+#define GTC_CNTCR_REG 0x0
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+#define GTC_CNTR_EN 0x3
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+
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+/**
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+ * struct k3_rproc_privdata - Structure representing Remote processor data.
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+ * @rproc_pwrdmn: rproc power domain data
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+ * @rproc_rst: rproc reset control data
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+ * @sci: Pointer to TISCI handle
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+ * @gtc_base: Timer base address.
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+ * @proc_id: TISCI processor ID
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+ * @host_id: TISCI host id to which the processor gets assigned to.
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+ */
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+struct k3_rproc_privdata {
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+ struct power_domain rproc_pwrdmn;
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+ struct power_domain gtc_pwrdmn;
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+ struct reset_ctl rproc_rst;
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+ const struct ti_sci_handle *sci;
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+ void *gtc_base;
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+ u16 proc_id;
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+ u16 host_id;
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+};
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+
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+/**
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+ * k3_rproc_load() - Load up the Remote processor image
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+ * @dev: rproc device pointer
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+ * @addr: Address at which image is available
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+ * @size: size of the image
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+ *
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+ * Return: 0 if all goes good, else appropriate error message.
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+ */
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+static int k3_rproc_load(struct udevice *dev, ulong addr, ulong size)
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+{
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+ struct k3_rproc_privdata *rproc = dev_get_priv(dev);
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+ const struct ti_sci_proc_ops *pops = &rproc->sci->ops.proc_ops;
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+ int ret;
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+
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+ dev_dbg(dev, "%s addr = 0x%lx, size = 0x%lx\n", __func__, addr, size);
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+
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+ /* request for the processor */
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+ ret = pops->proc_request(rproc->sci, rproc->proc_id);
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+ if (ret) {
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+ dev_err(dev, "Requesting processor failed %d\n", ret);
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+ return ret;
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+ }
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+
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+ ret = pops->set_proc_boot_cfg(rproc->sci, rproc->proc_id, addr, 0, 0);
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+ if (ret) {
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+ dev_err(dev, "set_proc_boot_cfg failed %d\n", ret);
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+ return ret;
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+ }
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+
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+ dev_dbg(dev, "%s: rproc successfully loaded\n", __func__);
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+
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+ return 0;
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+}
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+
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+/**
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+ * k3_rproc_start() - Start the remote processor
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+ * @dev: rproc device pointer
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+ *
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+ * Return: 0 if all went ok, else return appropriate error
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+ */
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+static int k3_rproc_start(struct udevice *dev)
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+{
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+ struct k3_rproc_privdata *rproc = dev_get_priv(dev);
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+ const struct ti_sci_proc_ops *pops = &rproc->sci->ops.proc_ops;
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+ int ret;
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+
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+ dev_dbg(dev, "%s\n", __func__);
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+
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+ ret = power_domain_on(&rproc->gtc_pwrdmn);
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+ if (ret) {
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+ dev_err(dev, "power_domain_on() failed: %d\n", ret);
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+ return ret;
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+ }
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+
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+ /* Enable the timer before starting remote core */
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+ writel(GTC_CNTR_EN, rproc->gtc_base + GTC_CNTCR_REG);
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+
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+ /*
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+ * Setting the right clock frequency would have taken care by
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+ * assigned-clock-rates during the device probe. So no need to
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+ * set the frequency again here.
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+ */
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+ ret = power_domain_on(&rproc->rproc_pwrdmn);
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+ if (ret) {
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+ dev_err(dev, "power_domain_on() failed: %d\n", ret);
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+ return ret;
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+ }
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+
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+ if (rproc->host_id != INVALID_ID) {
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+ ret = pops->proc_handover(rproc->sci, rproc->proc_id,
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+ rproc->host_id);
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+ if (ret) {
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+ dev_err(dev, "Handover processor failed %d\n", ret);
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+ return ret;
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+ }
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+ } else {
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+ ret = pops->proc_release(rproc->sci, rproc->proc_id);
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+ if (ret) {
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+ dev_err(dev, "Processor release failed %d\n", ret);
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+ return ret;
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+ }
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+ }
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+
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+ dev_dbg(dev, "%s: rproc successfully started\n", __func__);
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+
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+ return 0;
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+}
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+
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+/**
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+ * k3_rproc_init() - Initialize the remote processor
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+ * @dev: rproc device pointer
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+ *
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+ * Return: 0 if all went ok, else return appropriate error
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+ */
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+static int k3_rproc_init(struct udevice *dev)
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+{
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+ dev_dbg(dev, "%s\n", __func__);
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+
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+ /* Enable the module */
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+ dev_dbg(dev, "%s: rproc successfully initialized\n", __func__);
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+
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+ return 0;
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+}
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+
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+static const struct dm_rproc_ops k3_rproc_ops = {
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+ .init = k3_rproc_init,
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+ .load = k3_rproc_load,
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+ .start = k3_rproc_start,
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+};
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+
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+/**
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+ * k3_of_to_priv() - generate private data from device tree
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+ * @dev: corresponding k3 remote processor device
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+ * @priv: pointer to driver specific private data
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+ *
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+ * Return: 0 if all goes good, else appropriate error message.
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+ */
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+static int k3_rproc_of_to_priv(struct udevice *dev,
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+ struct k3_rproc_privdata *rproc)
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+{
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+ int ret;
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+
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+ dev_dbg(dev, "%s\n", __func__);
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+
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+ ret = power_domain_get_by_index(dev, &rproc->rproc_pwrdmn, 1);
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+ if (ret) {
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+ dev_err(dev, "power_domain_get() failed: %d\n", ret);
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+ return ret;
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+ }
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+
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+ ret = power_domain_get_by_index(dev, &rproc->gtc_pwrdmn, 0);
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+ if (ret) {
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+ dev_err(dev, "power_domain_get() failed: %d\n", ret);
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+ return ret;
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+ }
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+
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+ ret = reset_get_by_index(dev, 0, &rproc->rproc_rst);
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+ if (ret) {
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+ dev_err(dev, "reset_get() failed: %d\n", ret);
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+ return ret;
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+ }
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+
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+ rproc->sci = ti_sci_get_by_phandle(dev, "ti,sci");
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+ if (IS_ERR(rproc->sci)) {
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+ dev_err(dev, "ti_sci get failed: %d\n", ret);
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+ return PTR_ERR(rproc->sci);
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+ }
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+
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+ rproc->gtc_base = dev_read_addr_ptr(dev);
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+ if (!rproc->gtc_base) {
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+ dev_err(dev, "Get address failed\n");
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+ return -ENODEV;
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+ }
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+
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+ rproc->proc_id = dev_read_u32_default(dev, "ti,sci-proc-id",
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+ INVALID_ID);
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+ rproc->host_id = dev_read_u32_default(dev, "ti,sci-host-id",
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+ INVALID_ID);
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+
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+ return 0;
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+}
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+
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+/**
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+ * k3_rproc_probe() - Basic probe
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+ * @dev: corresponding k3 remote processor device
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+ *
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+ * Return: 0 if all goes good, else appropriate error message.
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+ */
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+static int k3_rproc_probe(struct udevice *dev)
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+{
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+ struct k3_rproc_privdata *priv;
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+ int ret;
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+
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+ dev_dbg(dev, "%s\n", __func__);
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+
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+ priv = dev_get_priv(dev);
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+
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+ ret = k3_rproc_of_to_priv(dev, priv);
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+ if (ret) {
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+ dev_dbg(dev, "%s: Probe failed with error %d\n", __func__, ret);
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+ return ret;
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+ }
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+
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+ dev_dbg(dev, "Remoteproc successfully probed\n");
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+
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+ return 0;
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+}
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+
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+static const struct udevice_id k3_rproc_ids[] = {
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+ { .compatible = "ti,am654-rproc"},
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+ {}
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+};
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+
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+U_BOOT_DRIVER(k3_rproc) = {
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+ .name = "k3_rproc",
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+ .of_match = k3_rproc_ids,
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+ .id = UCLASS_REMOTEPROC,
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+ .ops = &k3_rproc_ops,
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+ .probe = k3_rproc_probe,
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+ .priv_auto_alloc_size = sizeof(struct k3_rproc_privdata),
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+};
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