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linux/drivers/clk/rockchip/clk-cpu.c

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clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
/*
* Copyright (c) 2014 MundoReader S.L.
* Author: Heiko Stuebner <heiko@sntech.de>
*
* based on clk/samsung/clk-cpu.c
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
* Author: Thomas Abraham <thomas.ab@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* A CPU clock is defined as a clock supplied to a CPU or a group of CPUs.
* The CPU clock is typically derived from a hierarchy of clock
* blocks which includes mux and divider blocks. There are a number of other
* auxiliary clocks supplied to the CPU domain such as the debug blocks and AXI
* clock for CPU domain. The rates of these auxiliary clocks are related to the
* CPU clock rate and this relation is usually specified in the hardware manual
* of the SoC or supplied after the SoC characterization.
*
* The below implementation of the CPU clock allows the rate changes of the CPU
* clock and the corresponding rate changes of the auxillary clocks of the CPU
* domain. The platform clock driver provides a clock register configuration
* for each configurable rate which is then used to program the clock hardware
* registers to acheive a fast co-oridinated rate change for all the CPU domain
* clocks.
*
* On a rate change request for the CPU clock, the rate change is propagated
* upto the PLL supplying the clock to the CPU domain clock blocks. While the
* CPU domain PLL is reconfigured, the CPU domain clocks are driven using an
* alternate clock source. If required, the alternate clock source is divided
* down in order to keep the output clock rate within the previous OPP limits.
*/
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/io.h>
clk: rockchip: Properly include clk.h Clock provider drivers generally shouldn't include clk.h because it's the consumer API. Only include clk.h if it's actually used. Cc: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2015-06-20 01:00:46 +03:00
#include <linux/clk.h>
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
#include <linux/clk-provider.h>
#include "clk.h"
/**
* struct rockchip_cpuclk: information about clock supplied to a CPU core.
* @hw: handle between ccf and cpu clock.
* @alt_parent: alternate parent clock to use when switching the speed
* of the primary parent clock.
* @reg_base: base register for cpu-clock values.
* @clk_nb: clock notifier registered for changes in clock speed of the
* primary parent clock.
* @rate_count: number of rates in the rate_table
* @rate_table: pll-rates and their associated dividers
* @reg_data: cpu-specific register settings
* @lock: clock lock
*/
struct rockchip_cpuclk {
struct clk_hw hw;
struct clk_mux cpu_mux;
const struct clk_ops *cpu_mux_ops;
struct clk *alt_parent;
void __iomem *reg_base;
struct notifier_block clk_nb;
unsigned int rate_count;
struct rockchip_cpuclk_rate_table *rate_table;
const struct rockchip_cpuclk_reg_data *reg_data;
spinlock_t *lock;
};
#define to_rockchip_cpuclk_hw(hw) container_of(hw, struct rockchip_cpuclk, hw)
#define to_rockchip_cpuclk_nb(nb) \
container_of(nb, struct rockchip_cpuclk, clk_nb)
static const struct rockchip_cpuclk_rate_table *rockchip_get_cpuclk_settings(
struct rockchip_cpuclk *cpuclk, unsigned long rate)
{
const struct rockchip_cpuclk_rate_table *rate_table =
cpuclk->rate_table;
int i;
for (i = 0; i < cpuclk->rate_count; i++) {
if (rate == rate_table[i].prate)
return &rate_table[i];
}
return NULL;
}
static unsigned long rockchip_cpuclk_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct rockchip_cpuclk *cpuclk = to_rockchip_cpuclk_hw(hw);
const struct rockchip_cpuclk_reg_data *reg_data = cpuclk->reg_data;
u32 clksel0 = readl_relaxed(cpuclk->reg_base + reg_data->core_reg);
clksel0 >>= reg_data->div_core_shift;
clksel0 &= reg_data->div_core_mask;
return parent_rate / (clksel0 + 1);
}
static const struct clk_ops rockchip_cpuclk_ops = {
.recalc_rate = rockchip_cpuclk_recalc_rate,
};
static void rockchip_cpuclk_set_dividers(struct rockchip_cpuclk *cpuclk,
const struct rockchip_cpuclk_rate_table *rate)
{
int i;
/* alternate parent is active now. set the dividers */
for (i = 0; i < ARRAY_SIZE(rate->divs); i++) {
const struct rockchip_cpuclk_clksel *clksel = &rate->divs[i];
if (!clksel->reg)
continue;
pr_debug("%s: setting reg 0x%x to 0x%x\n",
__func__, clksel->reg, clksel->val);
clk: rockchip: fix coding style for clk-cpu.c Fix the issue reported by checkpatch: ERROR: space prohibited before that ',' (ctx:WxW) + writel(clksel->val , cpuclk->reg_base + clksel->reg); Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-02-15 06:33:50 +03:00
writel(clksel->val, cpuclk->reg_base + clksel->reg);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
}
}
static int rockchip_cpuclk_pre_rate_change(struct rockchip_cpuclk *cpuclk,
struct clk_notifier_data *ndata)
{
const struct rockchip_cpuclk_reg_data *reg_data = cpuclk->reg_data;
clk: rockchip: validity should be checked prior to cpu clock rate change If validity is not checked prior to clock rate change, clk_set_rate( cpu_clk, unsupported_rate) will return success, but the real clock rate change operation is prohibited in post clock change event. Alough post clock change event will report error due to unsupported clock rate is set, but this error message is ignored by clock framework. Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com> Tested-by: Rocky Hao <rocky.hao@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-11-08 12:10:14 +03:00
const struct rockchip_cpuclk_rate_table *rate;
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
unsigned long alt_prate, alt_div;
clk: rockchip: fix deadlock possibility in cpuclk Lockdep reported a possible deadlock between the cpuclk lock and for example the i2c driver. CPU0 CPU1 ---- ---- lock(clk_lock); local_irq_disable(); lock(&(&i2c->lock)->rlock); lock(clk_lock); <Interrupt> lock(&(&i2c->lock)->rlock); *** DEADLOCK *** The generic clock-types of the core ccf already use spin_lock_irqsave when touching clock registers, so do the same for the cpuclk. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Michael Turquette <mturquette@linaro.org> [mturquette@linaro.org: removed initialization of "flags"]
2015-01-16 19:52:44 +03:00
unsigned long flags;
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
clk: rockchip: validity should be checked prior to cpu clock rate change If validity is not checked prior to clock rate change, clk_set_rate( cpu_clk, unsupported_rate) will return success, but the real clock rate change operation is prohibited in post clock change event. Alough post clock change event will report error due to unsupported clock rate is set, but this error message is ignored by clock framework. Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com> Tested-by: Rocky Hao <rocky.hao@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-11-08 12:10:14 +03:00
/* check validity of the new rate */
rate = rockchip_get_cpuclk_settings(cpuclk, ndata->new_rate);
if (!rate) {
pr_err("%s: Invalid rate : %lu for cpuclk\n",
__func__, ndata->new_rate);
return -EINVAL;
}
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
alt_prate = clk_get_rate(cpuclk->alt_parent);
clk: rockchip: fix deadlock possibility in cpuclk Lockdep reported a possible deadlock between the cpuclk lock and for example the i2c driver. CPU0 CPU1 ---- ---- lock(clk_lock); local_irq_disable(); lock(&(&i2c->lock)->rlock); lock(clk_lock); <Interrupt> lock(&(&i2c->lock)->rlock); *** DEADLOCK *** The generic clock-types of the core ccf already use spin_lock_irqsave when touching clock registers, so do the same for the cpuclk. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Michael Turquette <mturquette@linaro.org> [mturquette@linaro.org: removed initialization of "flags"]
2015-01-16 19:52:44 +03:00
spin_lock_irqsave(cpuclk->lock, flags);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
/*
* If the old parent clock speed is less than the clock speed
* of the alternate parent, then it should be ensured that at no point
* the armclk speed is more than the old_rate until the dividers are
* set.
*/
if (alt_prate > ndata->old_rate) {
/* calculate dividers */
alt_div = DIV_ROUND_UP(alt_prate, ndata->old_rate) - 1;
if (alt_div > reg_data->div_core_mask) {
pr_warn("%s: limiting alt-divider %lu to %d\n",
__func__, alt_div, reg_data->div_core_mask);
alt_div = reg_data->div_core_mask;
}
/*
* Change parents and add dividers in a single transaction.
*
* NOTE: we do this in a single transaction so we're never
* dividing the primary parent by the extra dividers that were
* needed for the alt.
*/
pr_debug("%s: setting div %lu as alt-rate %lu > old-rate %lu\n",
__func__, alt_div, alt_prate, ndata->old_rate);
writel(HIWORD_UPDATE(alt_div, reg_data->div_core_mask,
reg_data->div_core_shift) |
clk: rockchip: allow varying mux parameters for cpuclk pll-sources Thers are only two parent PLLs that APLL and GPLL for core on the previous SoCs (RK3066/RK3188/RK3288/RK3368). Hence, we set fixed GPLL as alternate parent when core is switching freq. Since RK3399 big.LITTLE architecture, we need to select and adapt more PLLs (ALPLL/ABPLL/DPLL/GPLL) sources. Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-03-09 05:37:03 +03:00
HIWORD_UPDATE(reg_data->mux_core_alt,
reg_data->mux_core_mask,
reg_data->mux_core_shift),
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
cpuclk->reg_base + reg_data->core_reg);
} else {
/* select alternate parent */
clk: rockchip: allow varying mux parameters for cpuclk pll-sources Thers are only two parent PLLs that APLL and GPLL for core on the previous SoCs (RK3066/RK3188/RK3288/RK3368). Hence, we set fixed GPLL as alternate parent when core is switching freq. Since RK3399 big.LITTLE architecture, we need to select and adapt more PLLs (ALPLL/ABPLL/DPLL/GPLL) sources. Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-03-09 05:37:03 +03:00
writel(HIWORD_UPDATE(reg_data->mux_core_alt,
reg_data->mux_core_mask,
reg_data->mux_core_shift),
cpuclk->reg_base + reg_data->core_reg);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
}
clk: rockchip: fix deadlock possibility in cpuclk Lockdep reported a possible deadlock between the cpuclk lock and for example the i2c driver. CPU0 CPU1 ---- ---- lock(clk_lock); local_irq_disable(); lock(&(&i2c->lock)->rlock); lock(clk_lock); <Interrupt> lock(&(&i2c->lock)->rlock); *** DEADLOCK *** The generic clock-types of the core ccf already use spin_lock_irqsave when touching clock registers, so do the same for the cpuclk. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Michael Turquette <mturquette@linaro.org> [mturquette@linaro.org: removed initialization of "flags"]
2015-01-16 19:52:44 +03:00
spin_unlock_irqrestore(cpuclk->lock, flags);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
return 0;
}
static int rockchip_cpuclk_post_rate_change(struct rockchip_cpuclk *cpuclk,
struct clk_notifier_data *ndata)
{
const struct rockchip_cpuclk_reg_data *reg_data = cpuclk->reg_data;
const struct rockchip_cpuclk_rate_table *rate;
clk: rockchip: fix deadlock possibility in cpuclk Lockdep reported a possible deadlock between the cpuclk lock and for example the i2c driver. CPU0 CPU1 ---- ---- lock(clk_lock); local_irq_disable(); lock(&(&i2c->lock)->rlock); lock(clk_lock); <Interrupt> lock(&(&i2c->lock)->rlock); *** DEADLOCK *** The generic clock-types of the core ccf already use spin_lock_irqsave when touching clock registers, so do the same for the cpuclk. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Michael Turquette <mturquette@linaro.org> [mturquette@linaro.org: removed initialization of "flags"]
2015-01-16 19:52:44 +03:00
unsigned long flags;
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
rate = rockchip_get_cpuclk_settings(cpuclk, ndata->new_rate);
if (!rate) {
pr_err("%s: Invalid rate : %lu for cpuclk\n",
__func__, ndata->new_rate);
return -EINVAL;
}
clk: rockchip: fix deadlock possibility in cpuclk Lockdep reported a possible deadlock between the cpuclk lock and for example the i2c driver. CPU0 CPU1 ---- ---- lock(clk_lock); local_irq_disable(); lock(&(&i2c->lock)->rlock); lock(clk_lock); <Interrupt> lock(&(&i2c->lock)->rlock); *** DEADLOCK *** The generic clock-types of the core ccf already use spin_lock_irqsave when touching clock registers, so do the same for the cpuclk. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Michael Turquette <mturquette@linaro.org> [mturquette@linaro.org: removed initialization of "flags"]
2015-01-16 19:52:44 +03:00
spin_lock_irqsave(cpuclk->lock, flags);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
if (ndata->old_rate < ndata->new_rate)
rockchip_cpuclk_set_dividers(cpuclk, rate);
/*
* post-rate change event, re-mux to primary parent and remove dividers.
*
* NOTE: we do this in a single transaction so we're never dividing the
* primary parent by the extra dividers that were needed for the alt.
*/
writel(HIWORD_UPDATE(0, reg_data->div_core_mask,
reg_data->div_core_shift) |
clk: rockchip: allow varying mux parameters for cpuclk pll-sources Thers are only two parent PLLs that APLL and GPLL for core on the previous SoCs (RK3066/RK3188/RK3288/RK3368). Hence, we set fixed GPLL as alternate parent when core is switching freq. Since RK3399 big.LITTLE architecture, we need to select and adapt more PLLs (ALPLL/ABPLL/DPLL/GPLL) sources. Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-03-09 05:37:03 +03:00
HIWORD_UPDATE(reg_data->mux_core_main,
reg_data->mux_core_mask,
reg_data->mux_core_shift),
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
cpuclk->reg_base + reg_data->core_reg);
if (ndata->old_rate > ndata->new_rate)
rockchip_cpuclk_set_dividers(cpuclk, rate);
clk: rockchip: fix deadlock possibility in cpuclk Lockdep reported a possible deadlock between the cpuclk lock and for example the i2c driver. CPU0 CPU1 ---- ---- lock(clk_lock); local_irq_disable(); lock(&(&i2c->lock)->rlock); lock(clk_lock); <Interrupt> lock(&(&i2c->lock)->rlock); *** DEADLOCK *** The generic clock-types of the core ccf already use spin_lock_irqsave when touching clock registers, so do the same for the cpuclk. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Michael Turquette <mturquette@linaro.org> [mturquette@linaro.org: removed initialization of "flags"]
2015-01-16 19:52:44 +03:00
spin_unlock_irqrestore(cpuclk->lock, flags);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
return 0;
}
/*
* This clock notifier is called when the frequency of the parent clock
* of cpuclk is to be changed. This notifier handles the setting up all
* the divider clocks, remux to temporary parent and handling the safe
* frequency levels when using temporary parent.
*/
static int rockchip_cpuclk_notifier_cb(struct notifier_block *nb,
unsigned long event, void *data)
{
struct clk_notifier_data *ndata = data;
struct rockchip_cpuclk *cpuclk = to_rockchip_cpuclk_nb(nb);
int ret = 0;
pr_debug("%s: event %lu, old_rate %lu, new_rate: %lu\n",
__func__, event, ndata->old_rate, ndata->new_rate);
if (event == PRE_RATE_CHANGE)
ret = rockchip_cpuclk_pre_rate_change(cpuclk, ndata);
else if (event == POST_RATE_CHANGE)
ret = rockchip_cpuclk_post_rate_change(cpuclk, ndata);
return notifier_from_errno(ret);
}
struct clk *rockchip_clk_register_cpuclk(const char *name,
clk: make several parent names const Since commit 2893c379461a ("clk: make strings in parent name arrays const") the name of parent clocks can be const. So add more const in several clock drivers. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2015-05-28 11:45:51 +03:00
const char *const *parent_names, u8 num_parents,
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
const struct rockchip_cpuclk_reg_data *reg_data,
const struct rockchip_cpuclk_rate_table *rates,
int nrates, void __iomem *reg_base, spinlock_t *lock)
{
struct rockchip_cpuclk *cpuclk;
struct clk_init_data init;
struct clk *clk, *cclk;
int ret;
clk: rockchip: allow more than 2 parents for cpuclk RK3228's armclk has 3 parents, so allow cpuclk to have more than 2 parents. Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2015-12-09 12:04:10 +03:00
if (num_parents < 2) {
pr_err("%s: needs at least two parent clocks\n", __func__);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
return ERR_PTR(-EINVAL);
}
cpuclk = kzalloc(sizeof(*cpuclk), GFP_KERNEL);
if (!cpuclk)
return ERR_PTR(-ENOMEM);
init.name = name;
clk: rockchip: allow varying mux parameters for cpuclk pll-sources Thers are only two parent PLLs that APLL and GPLL for core on the previous SoCs (RK3066/RK3188/RK3288/RK3368). Hence, we set fixed GPLL as alternate parent when core is switching freq. Since RK3399 big.LITTLE architecture, we need to select and adapt more PLLs (ALPLL/ABPLL/DPLL/GPLL) sources. Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-03-09 05:37:03 +03:00
init.parent_names = &parent_names[reg_data->mux_core_main];
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
init.num_parents = 1;
init.ops = &rockchip_cpuclk_ops;
/* only allow rate changes when we have a rate table */
init.flags = (nrates > 0) ? CLK_SET_RATE_PARENT : 0;
/* disallow automatic parent changes by ccf */
init.flags |= CLK_SET_RATE_NO_REPARENT;
init.flags |= CLK_GET_RATE_NOCACHE;
cpuclk->reg_base = reg_base;
cpuclk->lock = lock;
cpuclk->reg_data = reg_data;
cpuclk->clk_nb.notifier_call = rockchip_cpuclk_notifier_cb;
cpuclk->hw.init = &init;
clk: rockchip: allow varying mux parameters for cpuclk pll-sources Thers are only two parent PLLs that APLL and GPLL for core on the previous SoCs (RK3066/RK3188/RK3288/RK3368). Hence, we set fixed GPLL as alternate parent when core is switching freq. Since RK3399 big.LITTLE architecture, we need to select and adapt more PLLs (ALPLL/ABPLL/DPLL/GPLL) sources. Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-03-09 05:37:03 +03:00
cpuclk->alt_parent = __clk_lookup(parent_names[reg_data->mux_core_alt]);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
if (!cpuclk->alt_parent) {
clk: rockchip: allow varying mux parameters for cpuclk pll-sources Thers are only two parent PLLs that APLL and GPLL for core on the previous SoCs (RK3066/RK3188/RK3288/RK3368). Hence, we set fixed GPLL as alternate parent when core is switching freq. Since RK3399 big.LITTLE architecture, we need to select and adapt more PLLs (ALPLL/ABPLL/DPLL/GPLL) sources. Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-03-09 05:37:03 +03:00
pr_err("%s: could not lookup alternate parent: (%d)\n",
__func__, reg_data->mux_core_alt);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
ret = -EINVAL;
goto free_cpuclk;
}
ret = clk_prepare_enable(cpuclk->alt_parent);
if (ret) {
pr_err("%s: could not enable alternate parent\n",
__func__);
goto free_cpuclk;
}
clk: rockchip: allow varying mux parameters for cpuclk pll-sources Thers are only two parent PLLs that APLL and GPLL for core on the previous SoCs (RK3066/RK3188/RK3288/RK3368). Hence, we set fixed GPLL as alternate parent when core is switching freq. Since RK3399 big.LITTLE architecture, we need to select and adapt more PLLs (ALPLL/ABPLL/DPLL/GPLL) sources. Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-03-09 05:37:03 +03:00
clk = __clk_lookup(parent_names[reg_data->mux_core_main]);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
if (!clk) {
clk: rockchip: allow varying mux parameters for cpuclk pll-sources Thers are only two parent PLLs that APLL and GPLL for core on the previous SoCs (RK3066/RK3188/RK3288/RK3368). Hence, we set fixed GPLL as alternate parent when core is switching freq. Since RK3399 big.LITTLE architecture, we need to select and adapt more PLLs (ALPLL/ABPLL/DPLL/GPLL) sources. Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-03-09 05:37:03 +03:00
pr_err("%s: could not lookup parent clock: (%d) %s\n",
__func__, reg_data->mux_core_main,
parent_names[reg_data->mux_core_main]);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
ret = -EINVAL;
clk: rockchip: disable alt_parent clk in err cases when registering cpuclk Add clk_disable_unprepare to handle cpuclk->alt_parent if rockchip_clk_register_cpuclk fails. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-02-15 06:33:15 +03:00
goto free_alt_parent;
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
}
ret = clk_notifier_register(clk, &cpuclk->clk_nb);
if (ret) {
pr_err("%s: failed to register clock notifier for %s\n",
__func__, name);
clk: rockchip: disable alt_parent clk in err cases when registering cpuclk Add clk_disable_unprepare to handle cpuclk->alt_parent if rockchip_clk_register_cpuclk fails. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-02-15 06:33:15 +03:00
goto free_alt_parent;
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
}
if (nrates > 0) {
cpuclk->rate_count = nrates;
cpuclk->rate_table = kmemdup(rates,
sizeof(*rates) * nrates,
GFP_KERNEL);
if (!cpuclk->rate_table) {
ret = -ENOMEM;
goto unregister_notifier;
}
}
cclk = clk_register(NULL, &cpuclk->hw);
clk: rockchip: fix cpuclk registration error handling It maybe due to a copy-paste error the error handing should be cclk not clk when checking if the cpuclk registration succeeded. Reported-by: Lin Huang <lin.huang@rock-chips.com> Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-05-26 16:49:08 +03:00
if (IS_ERR(cclk)) {
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
pr_err("%s: could not register cpuclk %s\n", __func__, name);
clk: rockchip: fix cpuclk registration error handling It maybe due to a copy-paste error the error handing should be cclk not clk when checking if the cpuclk registration succeeded. Reported-by: Lin Huang <lin.huang@rock-chips.com> Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-05-26 16:49:08 +03:00
ret = PTR_ERR(cclk);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
goto free_rate_table;
}
return cclk;
free_rate_table:
kfree(cpuclk->rate_table);
unregister_notifier:
clk_notifier_unregister(clk, &cpuclk->clk_nb);
clk: rockchip: disable alt_parent clk in err cases when registering cpuclk Add clk_disable_unprepare to handle cpuclk->alt_parent if rockchip_clk_register_cpuclk fails. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
2016-02-15 06:33:15 +03:00
free_alt_parent:
clk_disable_unprepare(cpuclk->alt_parent);
clk: rockchip: add new clock-type for the cpuclk When changing the armclk on Rockchip SoCs it is supposed to be reparented to an alternate parent before changing the underlying pll and back after the change. Additionally there exist clocks that are very tightly bound to the armclk whose divider values are set according to the armclk rate. Add a special clock-type to handle all that. The rate table and divider values will be supplied from the soc-specific clock controllers. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Doug Anderson <dianders@chromium.org> On a rk3288-board: Tested-by: Doug Anderson <dianders@chromium.org>
2014-09-05 00:10:43 +04:00
free_cpuclk:
kfree(cpuclk);
return ERR_PTR(ret);
}
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