--- /dev/null
+Texas Instruments' K3 Remote processor driver
+=============================================
+
+In K3 generation Socs, loading an image on any processing entity
+cannot be done directly from U-Boot. In order to load an image,
+remoteproc driver should communicate to SYSFW with a specific sequence.
+Also enable the timer required for this remotecore.
+
+Required properties:
+--------------------
+- compatible: Shall be: "ti,am654-rproc"
+- reg: base address of the remoteproc timer.
+- power-domains: Should contain two sets of entries:
+ First set corresponds to pm domain of the
+ remotecore timer. Seconf entry corresponds to the
+ remoteproc to start.
+ This property is as per the binding,
+ doc/device-tree-bindings/power/ti,sci-pm-domain.txt
+- resets: Should contain a phandle to a reset controller node
+ and an args specifier containing the remote code
+ device id and reset mask value. This is as per the
+ doc/device-tree-bindings/reset/ti,sci-reset.txt
+- ti,sci: Phandle to TI-SCI compatible System controller node.
+- ti,sci-proc-id: Processor id as identified by TISCI
+
+Optional properties:
+--------------------
+- assigned-clocks: Should contain a phandle to clock node and an args
+ specifier containing the remote core device id and
+ the clock id within the remote core. This is as per
+ doc/device-tree-bindings/clock/ti,sci-clk.txt
+- assigned-clock-rates: One entry for each entry of assigned-clocks. This is
+ the frequency at which the corresponding clock needs
+ to be assigned.
+- ti,sci-host-id: Host ID to which the processor control is transferred to
+
+Example:
+---------
+
+a53_0: a53@0 {
+ compatible = "ti,am654-rproc";
+ power-domains = <&k3_pds 61>,
+ <&k3_pds 202>;
+ resets = <&k3_reset 202 0>;
+ assigned-clocks = <&k3_clks 202 0>;
+ assigned-clock-rates = <800000000>;
+ ti,sci = <&dmsc>;
+ ti,sci-proc-id = <32>;
+ ti,sci-host-id = <10>;
+};
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Texas Instruments' K3 Remoteproc driver
+ *
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ * Lokesh Vutla <lokeshvutla@ti.com>
+ *
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <remoteproc.h>
+#include <errno.h>
+#include <clk.h>
+#include <reset.h>
+#include <asm/io.h>
+#include <power-domain.h>
+#include <linux/soc/ti/ti_sci_protocol.h>
+
+#define INVALID_ID 0xffff
+
+#define GTC_CNTCR_REG 0x0
+#define GTC_CNTR_EN 0x3
+
+/**
+ * struct k3_rproc_privdata - Structure representing Remote processor data.
+ * @rproc_pwrdmn: rproc power domain data
+ * @rproc_rst: rproc reset control data
+ * @sci: Pointer to TISCI handle
+ * @gtc_base: Timer base address.
+ * @proc_id: TISCI processor ID
+ * @host_id: TISCI host id to which the processor gets assigned to.
+ */
+struct k3_rproc_privdata {
+ struct power_domain rproc_pwrdmn;
+ struct power_domain gtc_pwrdmn;
+ struct reset_ctl rproc_rst;
+ const struct ti_sci_handle *sci;
+ void *gtc_base;
+ u16 proc_id;
+ u16 host_id;
+};
+
+/**
+ * k3_rproc_load() - Load up the Remote processor image
+ * @dev: rproc device pointer
+ * @addr: Address at which image is available
+ * @size: size of the image
+ *
+ * Return: 0 if all goes good, else appropriate error message.
+ */
+static int k3_rproc_load(struct udevice *dev, ulong addr, ulong size)
+{
+ struct k3_rproc_privdata *rproc = dev_get_priv(dev);
+ const struct ti_sci_proc_ops *pops = &rproc->sci->ops.proc_ops;
+ int ret;
+
+ dev_dbg(dev, "%s addr = 0x%lx, size = 0x%lx\n", __func__, addr, size);
+
+ /* request for the processor */
+ ret = pops->proc_request(rproc->sci, rproc->proc_id);
+ if (ret) {
+ dev_err(dev, "Requesting processor failed %d\n", ret);
+ return ret;
+ }
+
+ ret = pops->set_proc_boot_cfg(rproc->sci, rproc->proc_id, addr, 0, 0);
+ if (ret) {
+ dev_err(dev, "set_proc_boot_cfg failed %d\n", ret);
+ return ret;
+ }
+
+ dev_dbg(dev, "%s: rproc successfully loaded\n", __func__);
+
+ return 0;
+}
+
+/**
+ * k3_rproc_start() - Start the remote processor
+ * @dev: rproc device pointer
+ *
+ * Return: 0 if all went ok, else return appropriate error
+ */
+static int k3_rproc_start(struct udevice *dev)
+{
+ struct k3_rproc_privdata *rproc = dev_get_priv(dev);
+ const struct ti_sci_proc_ops *pops = &rproc->sci->ops.proc_ops;
+ int ret;
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ ret = power_domain_on(&rproc->gtc_pwrdmn);
+ if (ret) {
+ dev_err(dev, "power_domain_on() failed: %d\n", ret);
+ return ret;
+ }
+
+ /* Enable the timer before starting remote core */
+ writel(GTC_CNTR_EN, rproc->gtc_base + GTC_CNTCR_REG);
+
+ /*
+ * Setting the right clock frequency would have taken care by
+ * assigned-clock-rates during the device probe. So no need to
+ * set the frequency again here.
+ */
+ ret = power_domain_on(&rproc->rproc_pwrdmn);
+ if (ret) {
+ dev_err(dev, "power_domain_on() failed: %d\n", ret);
+ return ret;
+ }
+
+ if (rproc->host_id != INVALID_ID) {
+ ret = pops->proc_handover(rproc->sci, rproc->proc_id,
+ rproc->host_id);
+ if (ret) {
+ dev_err(dev, "Handover processor failed %d\n", ret);
+ return ret;
+ }
+ } else {
+ ret = pops->proc_release(rproc->sci, rproc->proc_id);
+ if (ret) {
+ dev_err(dev, "Processor release failed %d\n", ret);
+ return ret;
+ }
+ }
+
+ dev_dbg(dev, "%s: rproc successfully started\n", __func__);
+
+ return 0;
+}
+
+/**
+ * k3_rproc_init() - Initialize the remote processor
+ * @dev: rproc device pointer
+ *
+ * Return: 0 if all went ok, else return appropriate error
+ */
+static int k3_rproc_init(struct udevice *dev)
+{
+ dev_dbg(dev, "%s\n", __func__);
+
+ /* Enable the module */
+ dev_dbg(dev, "%s: rproc successfully initialized\n", __func__);
+
+ return 0;
+}
+
+static const struct dm_rproc_ops k3_rproc_ops = {
+ .init = k3_rproc_init,
+ .load = k3_rproc_load,
+ .start = k3_rproc_start,
+};
+
+/**
+ * k3_of_to_priv() - generate private data from device tree
+ * @dev: corresponding k3 remote processor device
+ * @priv: pointer to driver specific private data
+ *
+ * Return: 0 if all goes good, else appropriate error message.
+ */
+static int k3_rproc_of_to_priv(struct udevice *dev,
+ struct k3_rproc_privdata *rproc)
+{
+ int ret;
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ ret = power_domain_get_by_index(dev, &rproc->rproc_pwrdmn, 1);
+ if (ret) {
+ dev_err(dev, "power_domain_get() failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = power_domain_get_by_index(dev, &rproc->gtc_pwrdmn, 0);
+ if (ret) {
+ dev_err(dev, "power_domain_get() failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = reset_get_by_index(dev, 0, &rproc->rproc_rst);
+ if (ret) {
+ dev_err(dev, "reset_get() failed: %d\n", ret);
+ return ret;
+ }
+
+ rproc->sci = ti_sci_get_by_phandle(dev, "ti,sci");
+ if (IS_ERR(rproc->sci)) {
+ dev_err(dev, "ti_sci get failed: %d\n", ret);
+ return PTR_ERR(rproc->sci);
+ }
+
+ rproc->gtc_base = dev_read_addr_ptr(dev);
+ if (!rproc->gtc_base) {
+ dev_err(dev, "Get address failed\n");
+ return -ENODEV;
+ }
+
+ rproc->proc_id = dev_read_u32_default(dev, "ti,sci-proc-id",
+ INVALID_ID);
+ rproc->host_id = dev_read_u32_default(dev, "ti,sci-host-id",
+ INVALID_ID);
+
+ return 0;
+}
+
+/**
+ * k3_rproc_probe() - Basic probe
+ * @dev: corresponding k3 remote processor device
+ *
+ * Return: 0 if all goes good, else appropriate error message.
+ */
+static int k3_rproc_probe(struct udevice *dev)
+{
+ struct k3_rproc_privdata *priv;
+ int ret;
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ priv = dev_get_priv(dev);
+
+ ret = k3_rproc_of_to_priv(dev, priv);
+ if (ret) {
+ dev_dbg(dev, "%s: Probe failed with error %d\n", __func__, ret);
+ return ret;
+ }
+
+ dev_dbg(dev, "Remoteproc successfully probed\n");
+
+ return 0;
+}
+
+static const struct udevice_id k3_rproc_ids[] = {
+ { .compatible = "ti,am654-rproc"},
+ {}
+};
+
+U_BOOT_DRIVER(k3_rproc) = {
+ .name = "k3_rproc",
+ .of_match = k3_rproc_ids,
+ .id = UCLASS_REMOTEPROC,
+ .ops = &k3_rproc_ops,
+ .probe = k3_rproc_probe,
+ .priv_auto_alloc_size = sizeof(struct k3_rproc_privdata),
+};
projects / u-boot.git / commitdiff