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// SPDX-License-Identifier: GPL-2.0+
/*
* Texas Instruments' K3 ARM64 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 <dm/device_compat.h>
#include <linux/err.h>
#include <linux/soc/ti/ti_sci_protocol.h>
#include "ti_sci_proc.h"
#define INVALID_ID 0xffff
#define GTC_CNTCR_REG 0x0
#define GTC_CNTR_EN 0x3
/**
* struct k3_arm64_privdata - Structure representing Remote processor data.
* @rproc_pwrdmn: rproc power domain data
* @rproc_rst: rproc reset control data
* @sci: Pointer to TISCI handle
* @tsp: TISCI processor control helper structure
* @gtc_base: Timer base address.
*/
struct k3_arm64_privdata {
struct power_domain rproc_pwrdmn;
struct power_domain gtc_pwrdmn;
struct reset_ctl rproc_rst;
struct ti_sci_proc tsp;
void *gtc_base;
};
/**
* k3_arm64_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_arm64_load(struct udevice *dev, ulong addr, ulong size)
{
struct k3_arm64_privdata *rproc = dev_get_priv(dev);
int ret;
dev_dbg(dev, "%s addr = 0x%lx, size = 0x%lx\n", __func__, addr, size);
/* request for the processor */
ret = ti_sci_proc_request(&rproc->tsp);
if (ret)
return ret;
return ti_sci_proc_set_config(&rproc->tsp, addr, 0, 0);
}
/**
* k3_arm64_start() - Start the remote processor
* @dev: rproc device pointer
*
* Return: 0 if all went ok, else return appropriate error
*/
static int k3_arm64_start(struct udevice *dev)
{
struct k3_arm64_privdata *rproc = dev_get_priv(dev);
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;
}
return ti_sci_proc_release(&rproc->tsp);
}
/**
* k3_arm64_init() - Initialize the remote processor
* @dev: rproc device pointer
*
* Return: 0 if all went ok, else return appropriate error
*/
static int k3_arm64_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_arm64_ops = {
.init = k3_arm64_init,
.load = k3_arm64_load,
.start = k3_arm64_start,
};
static int ti_sci_proc_of_to_priv(struct udevice *dev, struct ti_sci_proc *tsp)
{
dev_dbg(dev, "%s\n", __func__);
tsp->sci = ti_sci_get_by_phandle(dev, "ti,sci");
if (IS_ERR(tsp->sci)) {
dev_err(dev, "ti_sci get failed: %ld\n", PTR_ERR(tsp->sci));
return PTR_ERR(tsp->sci);
}
tsp->proc_id = dev_read_u32_default(dev, "ti,sci-proc-id", INVALID_ID);
if (tsp->proc_id == INVALID_ID) {
dev_err(dev, "proc id not populated\n");
return -ENOENT;
}
tsp->host_id = dev_read_u32_default(dev, "ti,sci-host-id", INVALID_ID);
tsp->ops = &tsp->sci->ops.proc_ops;
return 0;
}
/**
* 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_arm64_of_to_priv(struct udevice *dev,
struct k3_arm64_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;
}
ret = ti_sci_proc_of_to_priv(dev, &rproc->tsp);
if (ret)
return ret;
rproc->gtc_base = dev_read_addr_ptr(dev);
if (!rproc->gtc_base) {
dev_err(dev, "Get address failed\n");
return -ENODEV;
}
return 0;
}
/**
* k3_arm64_probe() - Basic probe
* @dev: corresponding k3 remote processor device
*
* Return: 0 if all goes good, else appropriate error message.
*/
static int k3_arm64_probe(struct udevice *dev)
{
struct k3_arm64_privdata *priv;
int ret;
dev_dbg(dev, "%s\n", __func__);
priv = dev_get_priv(dev);
ret = k3_arm64_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_arm64_ids[] = {
{ .compatible = "ti,am654-arm64"},
{ .compatible = "ti,am654-rproc"},
{}
};
U_BOOT_DRIVER(k3_arm64) = {
.name = "k3_arm64",
.of_match = k3_arm64_ids,
.id = UCLASS_REMOTEPROC,
.ops = &k3_arm64_ops,
.probe = k3_arm64_probe,
.priv_auto = sizeof(struct k3_arm64_privdata),
.flags = DM_FLAG_DEFAULT_PD_CTRL_OFF,
};
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