u-boot/drivers/remoteproc/k3_rproc.c
Lokesh Vutla c365ed7d4b remoteproc: Introduce K3 remoteproc driver
Add support for K3 based remoteproc driver that
communicates with TISCI to start start a remote processor.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
2018-09-11 08:32:55 -04:00

244 lines
5.7 KiB
C

// 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),
};