diff options
author | Peng Fan <peng.fan@nxp.com> | 2022-08-30 06:31:32 +0300 |
---|---|---|
committer | Abel Vesa <abel.vesa@linaro.org> | 2022-09-19 13:06:45 +0300 |
commit | 4a3de5aa7743d1def6fba783c072e41df6b851c5 (patch) | |
tree | 78548dbc68c00732f2e4fd9b8858891a78ccc3e8 /drivers/clk/imx | |
parent | 90e58072b9d89f85283e05131d650d196b3ecfef (diff) | |
download | linux-4a3de5aa7743d1def6fba783c072e41df6b851c5.tar.xz |
clk: imx: clk-composite-93: check slice busy
i.MX93 CCM ROOT STAT register has a SLICE_BUSY bit:
indication for clock generation logic is applying new setting.
0b - Clock generation logic is not busy.
1b - Clock generation logic is applying new setting.
So when set parent/rate/gate, need check this bit.
Introduce specific ops to do the work.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20220830033137.4149542-4-peng.fan@oss.nxp.com
Diffstat (limited to 'drivers/clk/imx')
-rw-r--r-- | drivers/clk/imx/clk-composite-93.c | 163 |
1 files changed, 160 insertions, 3 deletions
diff --git a/drivers/clk/imx/clk-composite-93.c b/drivers/clk/imx/clk-composite-93.c index b44619aa5ca5..19f4037e6cca 100644 --- a/drivers/clk/imx/clk-composite-93.c +++ b/drivers/clk/imx/clk-composite-93.c @@ -9,20 +9,176 @@ #include <linux/errno.h> #include <linux/export.h> #include <linux/io.h> +#include <linux/iopoll.h> #include <linux/slab.h> #include "clk.h" +#define TIMEOUT_US 500U + #define CCM_DIV_SHIFT 0 #define CCM_DIV_WIDTH 8 #define CCM_MUX_SHIFT 8 #define CCM_MUX_MASK 3 #define CCM_OFF_SHIFT 24 +#define CCM_BUSY_SHIFT 28 +#define STAT_OFFSET 0x4 #define AUTHEN_OFFSET 0x30 #define TZ_NS_SHIFT 9 #define TZ_NS_MASK BIT(9) +static int imx93_clk_composite_wait_ready(struct clk_hw *hw, void __iomem *reg) +{ + int ret; + u32 val; + + ret = readl_poll_timeout_atomic(reg + STAT_OFFSET, val, !(val & BIT(CCM_BUSY_SHIFT)), + 0, TIMEOUT_US); + if (ret) + pr_err("Slice[%s] busy timeout\n", clk_hw_get_name(hw)); + + return ret; +} + +static void imx93_clk_composite_gate_endisable(struct clk_hw *hw, int enable) +{ + struct clk_gate *gate = to_clk_gate(hw); + unsigned long flags; + u32 reg; + + if (gate->lock) + spin_lock_irqsave(gate->lock, flags); + + reg = readl(gate->reg); + + if (enable) + reg &= ~BIT(gate->bit_idx); + else + reg |= BIT(gate->bit_idx); + + writel(reg, gate->reg); + + imx93_clk_composite_wait_ready(hw, gate->reg); + + if (gate->lock) + spin_unlock_irqrestore(gate->lock, flags); +} + +static int imx93_clk_composite_gate_enable(struct clk_hw *hw) +{ + imx93_clk_composite_gate_endisable(hw, 1); + + return 0; +} + +static void imx93_clk_composite_gate_disable(struct clk_hw *hw) +{ + imx93_clk_composite_gate_endisable(hw, 0); +} + +static const struct clk_ops imx93_clk_composite_gate_ops = { + .enable = imx93_clk_composite_gate_enable, + .disable = imx93_clk_composite_gate_disable, + .is_enabled = clk_gate_is_enabled, +}; + +static unsigned long +imx93_clk_composite_divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + return clk_divider_ops.recalc_rate(hw, parent_rate); +} + +static long +imx93_clk_composite_divider_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate) +{ + return clk_divider_ops.round_rate(hw, rate, prate); +} + +static int +imx93_clk_composite_divider_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) +{ + return clk_divider_ops.determine_rate(hw, req); +} + +static int imx93_clk_composite_divider_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_divider *divider = to_clk_divider(hw); + int value; + unsigned long flags = 0; + u32 val; + int ret; + + value = divider_get_val(rate, parent_rate, divider->table, divider->width, divider->flags); + if (value < 0) + return value; + + if (divider->lock) + spin_lock_irqsave(divider->lock, flags); + + val = readl(divider->reg); + val &= ~(clk_div_mask(divider->width) << divider->shift); + val |= (u32)value << divider->shift; + writel(val, divider->reg); + + ret = imx93_clk_composite_wait_ready(hw, divider->reg); + + if (divider->lock) + spin_unlock_irqrestore(divider->lock, flags); + + return ret; +} + +static const struct clk_ops imx93_clk_composite_divider_ops = { + .recalc_rate = imx93_clk_composite_divider_recalc_rate, + .round_rate = imx93_clk_composite_divider_round_rate, + .determine_rate = imx93_clk_composite_divider_determine_rate, + .set_rate = imx93_clk_composite_divider_set_rate, +}; + +static u8 imx93_clk_composite_mux_get_parent(struct clk_hw *hw) +{ + return clk_mux_ops.get_parent(hw); +} + +static int imx93_clk_composite_mux_set_parent(struct clk_hw *hw, u8 index) +{ + struct clk_mux *mux = to_clk_mux(hw); + u32 val = clk_mux_index_to_val(mux->table, mux->flags, index); + unsigned long flags = 0; + u32 reg; + int ret; + + if (mux->lock) + spin_lock_irqsave(mux->lock, flags); + + reg = readl(mux->reg); + reg &= ~(mux->mask << mux->shift); + val = val << mux->shift; + reg |= val; + writel(reg, mux->reg); + + ret = imx93_clk_composite_wait_ready(hw, mux->reg); + + if (mux->lock) + spin_unlock_irqrestore(mux->lock, flags); + + return ret; +} + +static int +imx93_clk_composite_mux_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) +{ + return clk_mux_ops.determine_rate(hw, req); +} + +static const struct clk_ops imx93_clk_composite_mux_ops = { + .get_parent = imx93_clk_composite_mux_get_parent, + .set_parent = imx93_clk_composite_mux_set_parent, + .determine_rate = imx93_clk_composite_mux_determine_rate, +}; + struct clk_hw *imx93_clk_composite_flags(const char *name, const char * const *parent_names, int num_parents, void __iomem *reg, unsigned long flags) @@ -74,9 +230,10 @@ struct clk_hw *imx93_clk_composite_flags(const char *name, const char * const *p gate->flags = CLK_GATE_SET_TO_DISABLE; hw = clk_hw_register_composite(NULL, name, parent_names, num_parents, - mux_hw, &clk_mux_ops, div_hw, - &clk_divider_ops, gate_hw, - &clk_gate_ops, flags | CLK_SET_RATE_NO_REPARENT); + mux_hw, &imx93_clk_composite_mux_ops, div_hw, + &imx93_clk_composite_divider_ops, gate_hw, + &imx93_clk_composite_gate_ops, + flags | CLK_SET_RATE_NO_REPARENT); } if (IS_ERR(hw)) |