redonkable/remarkable-linux
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remoteproc: st: add reserved memory support

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ST remote processor needs some specified memory regions for
firmware and IPC.
Memory regions are defined as reserved memory and should
be registered in remoteproc core thanks to rproc_add_carveout
function before rproc_start. For this, st rproc driver implements
prepare ops.

Signed-off-by: Loic Pallardy <loic.pallardy@st.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Loic Pallardy 2019-01-10 14:50:50 +01:00 committed by Bjorn Andersson
parent 086d08725d
commit 3df52ed7f2
1 changed files with 80 additions and 11 deletions
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91
drivers/remoteproc/st_remoteproc.c
View file

@ -19,6 +19,7 @@
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
@ -91,6 +92,77 @@ static void st_rproc_kick(struct rproc *rproc, int vqid)
dev_err(dev, "failed to send message via mbox: %d\n", ret);
}
static int st_rproc_mem_alloc(struct rproc *rproc,
struct rproc_mem_entry *mem)
{
struct device *dev = rproc->dev.parent;
void *va;
va = ioremap_wc(mem->dma, mem->len);
if (!va) {
dev_err(dev, "Unable to map memory region: %pa+%zx\n",
&mem->dma, mem->len);
return -ENOMEM;
}
/* Update memory entry va */
mem->va = va;
return 0;
}
static int st_rproc_mem_release(struct rproc *rproc,
struct rproc_mem_entry *mem)
{
iounmap(mem->va);
return 0;
}
static int st_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
{
struct device *dev = rproc->dev.parent;
struct device_node *np = dev->of_node;
struct rproc_mem_entry *mem;
struct reserved_mem *rmem;
struct of_phandle_iterator it;
int index = 0;
of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
while (of_phandle_iterator_next(&it) == 0) {
rmem = of_reserved_mem_lookup(it.node);
if (!rmem) {
dev_err(dev, "unable to acquire memory-region\n");
return -EINVAL;
}
/* No need to map vdev buffer */
if (strcmp(it.node->name, "vdev0buffer")) {
/* Register memory region */
mem = rproc_mem_entry_init(dev, NULL,
(dma_addr_t)rmem->base,
rmem->size, rmem->base,
st_rproc_mem_alloc,
st_rproc_mem_release,
it.node->name);
} else {
/* Register reserved memory for vdev buffer allocation */
mem = rproc_of_resm_mem_entry_init(dev, index,
rmem->size,
rmem->base,
it.node->name);
}
if (!mem)
return -ENOMEM;
rproc_add_carveout(rproc, mem);
index++;
}
return rproc_elf_load_rsc_table(rproc, fw);
}
static int st_rproc_start(struct rproc *rproc)
{
struct st_rproc *ddata = rproc->priv;
@ -158,9 +230,14 @@ static int st_rproc_stop(struct rproc *rproc)
}
static const struct rproc_ops st_rproc_ops = {
.kick = st_rproc_kick,
.start = st_rproc_start,
.stop = st_rproc_stop,
.kick = st_rproc_kick,
.start = st_rproc_start,
.stop = st_rproc_stop,
.parse_fw = st_rproc_parse_fw,
.load = rproc_elf_load_segments,
.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
.sanity_check = rproc_elf_sanity_check,
.get_boot_addr = rproc_elf_get_boot_addr,
};
/*
@ -254,12 +331,6 @@ static int st_rproc_parse_dt(struct platform_device *pdev)
return -EINVAL;
}
err = of_reserved_mem_device_init(dev);
if (err) {
dev_err(dev, "Failed to obtain shared memory\n");
return err;
}
err = clk_prepare(ddata->clk);
if (err)
dev_err(dev, "failed to get clock\n");
@ -387,8 +458,6 @@ static int st_rproc_remove(struct platform_device *pdev)
clk_disable_unprepare(ddata->clk);
of_reserved_mem_device_release(&pdev->dev);
for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
mbox_free_channel(ddata->mbox_chan[i]);