tegra-hsp.c
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/*
* Copyright (c) 2016, NVIDIA CORPORATION.
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <asm/io.h>
#include <dm.h>
#include <mailbox-uclass.h>
#include <dt-bindings/mailbox/tegra186-hsp.h>
#define TEGRA_HSP_INT_DIMENSIONING 0x380
#define TEGRA_HSP_INT_DIMENSIONING_NSI_SHIFT 16
#define TEGRA_HSP_INT_DIMENSIONING_NSI_MASK 0xf
#define TEGRA_HSP_INT_DIMENSIONING_NDB_SHIFT 12
#define TEGRA_HSP_INT_DIMENSIONING_NDB_MASK 0xf
#define TEGRA_HSP_INT_DIMENSIONING_NAS_SHIFT 8
#define TEGRA_HSP_INT_DIMENSIONING_NAS_MASK 0xf
#define TEGRA_HSP_INT_DIMENSIONING_NSS_SHIFT 4
#define TEGRA_HSP_INT_DIMENSIONING_NSS_MASK 0xf
#define TEGRA_HSP_INT_DIMENSIONING_NSM_SHIFT 0
#define TEGRA_HSP_INT_DIMENSIONING_NSM_MASK 0xf
#define TEGRA_HSP_DB_REG_TRIGGER 0x0
#define TEGRA_HSP_DB_REG_ENABLE 0x4
#define TEGRA_HSP_DB_REG_RAW 0x8
#define TEGRA_HSP_DB_REG_PENDING 0xc
#define TEGRA_HSP_DB_ID_CCPLEX 1
#define TEGRA_HSP_DB_ID_BPMP 3
#define TEGRA_HSP_DB_ID_NUM 7
struct tegra_hsp {
fdt_addr_t regs;
uint32_t db_base;
};
DECLARE_GLOBAL_DATA_PTR;
static uint32_t *tegra_hsp_reg(struct tegra_hsp *thsp, uint32_t db_id,
uint32_t reg)
{
return (uint32_t *)(thsp->regs + thsp->db_base + (db_id * 0x100) + reg);
}
static uint32_t tegra_hsp_readl(struct tegra_hsp *thsp, uint32_t db_id,
uint32_t reg)
{
uint32_t *r = tegra_hsp_reg(thsp, db_id, reg);
return readl(r);
}
static void tegra_hsp_writel(struct tegra_hsp *thsp, uint32_t val,
uint32_t db_id, uint32_t reg)
{
uint32_t *r = tegra_hsp_reg(thsp, db_id, reg);
writel(val, r);
readl(r);
}
static int tegra_hsp_db_id(ulong chan_id)
{
switch (chan_id) {
case (HSP_MBOX_TYPE_DB << 16) | HSP_DB_MASTER_BPMP:
return TEGRA_HSP_DB_ID_BPMP;
default:
debug("Invalid channel ID\n");
return -EINVAL;
}
}
static int tegra_hsp_of_xlate(struct mbox_chan *chan,
struct ofnode_phandle_args *args)
{
debug("%s(chan=%p)\n", __func__, chan);
if (args->args_count != 2) {
debug("Invaild args_count: %d\n", args->args_count);
return -EINVAL;
}
chan->id = (args->args[0] << 16) | args->args[1];
return 0;
}
static int tegra_hsp_request(struct mbox_chan *chan)
{
int db_id;
debug("%s(chan=%p)\n", __func__, chan);
db_id = tegra_hsp_db_id(chan->id);
if (db_id < 0) {
debug("tegra_hsp_db_id() failed: %d\n", db_id);
return -EINVAL;
}
return 0;
}
static int tegra_hsp_free(struct mbox_chan *chan)
{
debug("%s(chan=%p)\n", __func__, chan);
return 0;
}
static int tegra_hsp_send(struct mbox_chan *chan, const void *data)
{
struct tegra_hsp *thsp = dev_get_priv(chan->dev);
int db_id;
debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
db_id = tegra_hsp_db_id(chan->id);
tegra_hsp_writel(thsp, 1, db_id, TEGRA_HSP_DB_REG_TRIGGER);
return 0;
}
static int tegra_hsp_recv(struct mbox_chan *chan, void *data)
{
struct tegra_hsp *thsp = dev_get_priv(chan->dev);
uint32_t db_id = TEGRA_HSP_DB_ID_CCPLEX;
uint32_t val;
debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
val = tegra_hsp_readl(thsp, db_id, TEGRA_HSP_DB_REG_RAW);
if (!(val & BIT(chan->id)))
return -ENODATA;
tegra_hsp_writel(thsp, BIT(chan->id), db_id, TEGRA_HSP_DB_REG_RAW);
return 0;
}
static int tegra_hsp_bind(struct udevice *dev)
{
debug("%s(dev=%p)\n", __func__, dev);
return 0;
}
static int tegra_hsp_probe(struct udevice *dev)
{
struct tegra_hsp *thsp = dev_get_priv(dev);
u32 val;
int nr_sm, nr_ss, nr_as;
debug("%s(dev=%p)\n", __func__, dev);
thsp->regs = devfdt_get_addr(dev);
if (thsp->regs == FDT_ADDR_T_NONE)
return -ENODEV;
val = readl(thsp->regs + TEGRA_HSP_INT_DIMENSIONING);
nr_sm = (val >> TEGRA_HSP_INT_DIMENSIONING_NSM_SHIFT) &
TEGRA_HSP_INT_DIMENSIONING_NSM_MASK;
nr_ss = (val >> TEGRA_HSP_INT_DIMENSIONING_NSS_SHIFT) &
TEGRA_HSP_INT_DIMENSIONING_NSS_MASK;
nr_as = (val >> TEGRA_HSP_INT_DIMENSIONING_NAS_SHIFT) &
TEGRA_HSP_INT_DIMENSIONING_NAS_MASK;
thsp->db_base = (1 + (nr_sm >> 1) + nr_ss + nr_as) << 16;
return 0;
}
static const struct udevice_id tegra_hsp_ids[] = {
{ .compatible = "nvidia,tegra186-hsp" },
{ }
};
struct mbox_ops tegra_hsp_mbox_ops = {
.of_xlate = tegra_hsp_of_xlate,
.request = tegra_hsp_request,
.free = tegra_hsp_free,
.send = tegra_hsp_send,
.recv = tegra_hsp_recv,
};
U_BOOT_DRIVER(tegra_hsp) = {
.name = "tegra-hsp",
.id = UCLASS_MAILBOX,
.of_match = tegra_hsp_ids,
.bind = tegra_hsp_bind,
.probe = tegra_hsp_probe,
.priv_auto_alloc_size = sizeof(struct tegra_hsp),
.ops = &tegra_hsp_mbox_ops,
};