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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
*/
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <soc/qcom/cmd-db.h>
#include <soc/qcom/rpmh.h>
#include <soc/qcom/tcs.h>
#include <dt-bindings/clock/qcom,rpmh.h>
#define CLK_RPMH_ARC_EN_OFFSET 0
#define CLK_RPMH_VRM_EN_OFFSET 4
/**
* struct bcm_db - Auxiliary data pertaining to each Bus Clock Manager(BCM)
* @unit: divisor used to convert Hz value to an RPMh msg
* @width: multiplier used to convert Hz value to an RPMh msg
* @vcd: virtual clock domain that this bcm belongs to
* @reserved: reserved to pad the struct
*/
struct bcm_db {
__le32 unit;
__le16 width;
u8 vcd;
u8 reserved;
};
/**
* struct clk_rpmh - individual rpmh clock data structure
* @hw: handle between common and hardware-specific interfaces
* @res_name: resource name for the rpmh clock
* @div: clock divider to compute the clock rate
* @res_addr: base address of the rpmh resource within the RPMh
* @res_on_val: rpmh clock enable value
* @state: rpmh clock requested state
* @aggr_state: rpmh clock aggregated state
* @last_sent_aggr_state: rpmh clock last aggr state sent to RPMh
* @valid_state_mask: mask to determine the state of the rpmh clock
* @unit: divisor to convert rate to rpmh msg in magnitudes of Khz
* @dev: device to which it is attached
* @peer: pointer to the clock rpmh sibling
*/
struct clk_rpmh {
struct clk_hw hw;
const char *res_name;
u8 div;
u32 res_addr;
u32 res_on_val;
u32 state;
u32 aggr_state;
u32 last_sent_aggr_state;
u32 valid_state_mask;
u32 unit;
struct device *dev;
struct clk_rpmh *peer;
};
struct clk_rpmh_desc {
struct clk_hw **clks;
size_t num_clks;
};
static DEFINE_MUTEX(rpmh_clk_lock);
#define __DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \
_res_en_offset, _res_on, _div) \
static struct clk_rpmh _platform##_##_name_active; \
static struct clk_rpmh _platform##_##_name = { \
.res_name = _res_name, \
.res_addr = _res_en_offset, \
.res_on_val = _res_on, \
.div = _div, \
.peer = &_platform##_##_name_active, \
.valid_state_mask = (BIT(RPMH_WAKE_ONLY_STATE) | \
BIT(RPMH_ACTIVE_ONLY_STATE) | \
BIT(RPMH_SLEEP_STATE)), \
.hw.init = &(struct clk_init_data){ \
.ops = &clk_rpmh_ops, \
.name = #_name, \
.parent_data = &(const struct clk_parent_data){ \
.fw_name = "xo", \
.name = "xo_board", \
}, \
.num_parents = 1, \
}, \
}; \
static struct clk_rpmh _platform##_##_name_active = { \
.res_name = _res_name, \
.res_addr = _res_en_offset, \
.res_on_val = _res_on, \
.div = _div, \
.peer = &_platform##_##_name, \
.valid_state_mask = (BIT(RPMH_WAKE_ONLY_STATE) | \
BIT(RPMH_ACTIVE_ONLY_STATE)), \
.hw.init = &(struct clk_init_data){ \
.ops = &clk_rpmh_ops, \
.name = #_name_active, \
.parent_data = &(const struct clk_parent_data){ \
.fw_name = "xo", \
.name = "xo_board", \
}, \
.num_parents = 1, \
}, \
}
#define DEFINE_CLK_RPMH_ARC(_platform, _name, _name_active, _res_name, \
_res_on, _div) \
__DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \
CLK_RPMH_ARC_EN_OFFSET, _res_on, _div)
#define DEFINE_CLK_RPMH_VRM(_platform, _name, _name_active, _res_name, \
_div) \
__DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \
CLK_RPMH_VRM_EN_OFFSET, 1, _div)
#define DEFINE_CLK_RPMH_BCM(_platform, _name, _res_name) \
static struct clk_rpmh _platform##_##_name = { \
.res_name = _res_name, \
.valid_state_mask = BIT(RPMH_ACTIVE_ONLY_STATE), \
.div = 1, \
.hw.init = &(struct clk_init_data){ \
.ops = &clk_rpmh_bcm_ops, \
.name = #_name, \
}, \
}
static inline struct clk_rpmh *to_clk_rpmh(struct clk_hw *_hw)
{
return container_of(_hw, struct clk_rpmh, hw);
}
static inline bool has_state_changed(struct clk_rpmh *c, u32 state)
{
return (c->last_sent_aggr_state & BIT(state))
!= (c->aggr_state & BIT(state));
}
static int clk_rpmh_send(struct clk_rpmh *c, enum rpmh_state state,
struct tcs_cmd *cmd, bool wait)
{
if (wait)
return rpmh_write(c->dev, state, cmd, 1);
return rpmh_write_async(c->dev, state, cmd, 1);
}
static int clk_rpmh_send_aggregate_command(struct clk_rpmh *c)
{
struct tcs_cmd cmd = { 0 };
u32 cmd_state, on_val;
enum rpmh_state state = RPMH_SLEEP_STATE;
int ret;
bool wait;
cmd.addr = c->res_addr;
cmd_state = c->aggr_state;
on_val = c->res_on_val;
for (; state <= RPMH_ACTIVE_ONLY_STATE; state++) {
if (has_state_changed(c, state)) {
if (cmd_state & BIT(state))
cmd.data = on_val;
wait = cmd_state && state == RPMH_ACTIVE_ONLY_STATE;
ret = clk_rpmh_send(c, state, &cmd, wait);
if (ret) {
dev_err(c->dev, "set %s state of %s failed: (%d)\n",
!state ? "sleep" :
state == RPMH_WAKE_ONLY_STATE ?
"wake" : "active", c->res_name, ret);
return ret;
}
}
}
c->last_sent_aggr_state = c->aggr_state;
c->peer->last_sent_aggr_state = c->last_sent_aggr_state;
return 0;
}
/*
* Update state and aggregate state values based on enable value.
*/
static int clk_rpmh_aggregate_state_send_command(struct clk_rpmh *c,
bool enable)
{
int ret;
/* Nothing required to be done if already off or on */
if (enable == c->state)
return 0;
c->state = enable ? c->valid_state_mask : 0;
c->aggr_state = c->state | c->peer->state;
c->peer->aggr_state = c->aggr_state;
ret = clk_rpmh_send_aggregate_command(c);
if (!ret)
return 0;
if (ret && enable)
c->state = 0;
else if (ret)
c->state = c->valid_state_mask;
WARN(1, "clk: %s failed to %s\n", c->res_name,
enable ? "enable" : "disable");
return ret;
}
static int clk_rpmh_prepare(struct clk_hw *hw)
{
struct clk_rpmh *c = to_clk_rpmh(hw);
int ret = 0;
mutex_lock(&rpmh_clk_lock);
ret = clk_rpmh_aggregate_state_send_command(c, true);
mutex_unlock(&rpmh_clk_lock);
return ret;
}
static void clk_rpmh_unprepare(struct clk_hw *hw)
{
struct clk_rpmh *c = to_clk_rpmh(hw);
mutex_lock(&rpmh_clk_lock);
clk_rpmh_aggregate_state_send_command(c, false);
mutex_unlock(&rpmh_clk_lock);
};
static unsigned long clk_rpmh_recalc_rate(struct clk_hw *hw,
unsigned long prate)
{
struct clk_rpmh *r = to_clk_rpmh(hw);
/*
* RPMh clocks have a fixed rate. Return static rate.
*/
return prate / r->div;
}
static const struct clk_ops clk_rpmh_ops = {
.prepare = clk_rpmh_prepare,
.unprepare = clk_rpmh_unprepare,
.recalc_rate = clk_rpmh_recalc_rate,
};
static int clk_rpmh_bcm_send_cmd(struct clk_rpmh *c, bool enable)
{
struct tcs_cmd cmd = { 0 };
u32 cmd_state;
int ret = 0;
mutex_lock(&rpmh_clk_lock);
if (enable) {
cmd_state = 1;
if (c->aggr_state)
cmd_state = c->aggr_state;
} else {
cmd_state = 0;
}
if (c->last_sent_aggr_state != cmd_state) {
cmd.addr = c->res_addr;
cmd.data = BCM_TCS_CMD(1, enable, 0, cmd_state);
ret = clk_rpmh_send(c, RPMH_ACTIVE_ONLY_STATE, &cmd, enable);
if (ret) {
dev_err(
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