diff options
Diffstat (limited to 'drivers/clk/imx/clk-composite-7ulp.c')
| -rw-r--r-- | drivers/clk/imx/clk-composite-7ulp.c | 88 |
1 files changed, 84 insertions, 4 deletions
diff --git a/drivers/clk/imx/clk-composite-7ulp.c b/drivers/clk/imx/clk-composite-7ulp.c index d85ba78abbb1..4eedd45dbaa8 100644 --- a/drivers/clk/imx/clk-composite-7ulp.c +++ b/drivers/clk/imx/clk-composite-7ulp.c @@ -8,6 +8,7 @@ #include <linux/bits.h> #include <linux/clk-provider.h> #include <linux/err.h> +#include <linux/io.h> #include <linux/slab.h> #include "../clk-fractional-divider.h" @@ -23,17 +24,61 @@ #define PCG_PCD_WIDTH 3 #define PCG_PCD_MASK 0x7 -struct clk_hw *imx7ulp_clk_hw_composite(const char *name, +#define SW_RST BIT(28) + +static int pcc_gate_enable(struct clk_hw *hw) +{ + struct clk_gate *gate = to_clk_gate(hw); + unsigned long flags; + u32 val; + int ret; + + ret = clk_gate_ops.enable(hw); + if (ret) + return ret; + + spin_lock_irqsave(gate->lock, flags); + /* + * release the sw reset for peripherals associated with + * with this pcc clock. + */ + val = readl(gate->reg); + val |= SW_RST; + writel(val, gate->reg); + + spin_unlock_irqrestore(gate->lock, flags); + + return 0; +} + +static void pcc_gate_disable(struct clk_hw *hw) +{ + clk_gate_ops.disable(hw); +} + +static int pcc_gate_is_enabled(struct clk_hw *hw) +{ + return clk_gate_ops.is_enabled(hw); +} + +static const struct clk_ops pcc_gate_ops = { + .enable = pcc_gate_enable, + .disable = pcc_gate_disable, + .is_enabled = pcc_gate_is_enabled, +}; + +static struct clk_hw *imx_ulp_clk_hw_composite(const char *name, const char * const *parent_names, int num_parents, bool mux_present, bool rate_present, bool gate_present, - void __iomem *reg) + void __iomem *reg, bool has_swrst) { struct clk_hw *mux_hw = NULL, *fd_hw = NULL, *gate_hw = NULL; struct clk_fractional_divider *fd = NULL; struct clk_gate *gate = NULL; struct clk_mux *mux = NULL; struct clk_hw *hw; + u32 val; if (mux_present) { mux = kzalloc(sizeof(*mux), GFP_KERNEL); @@ -43,6 +88,8 @@ struct clk_hw *imx7ulp_clk_hw_composite(const char *name, mux->reg = reg; mux->shift = PCG_PCS_SHIFT; mux->mask = PCG_PCS_MASK; + if (has_swrst) + mux->lock = &imx_ccm_lock; } if (rate_present) { @@ -60,6 +107,8 @@ struct clk_hw *imx7ulp_clk_hw_composite(const char *name, fd->nwidth = PCG_PCD_WIDTH; fd->nmask = PCG_PCD_MASK; fd->flags = CLK_FRAC_DIVIDER_ZERO_BASED; + if (has_swrst) + fd->lock = &imx_ccm_lock; } if (gate_present) { @@ -72,13 +121,27 @@ struct clk_hw *imx7ulp_clk_hw_composite(const char *name, gate_hw = &gate->hw; gate->reg = reg; gate->bit_idx = PCG_CGC_SHIFT; + if (has_swrst) + gate->lock = &imx_ccm_lock; + /* + * make sure clock is gated during clock tree initialization, + * the HW ONLY allow clock parent/rate changed with clock gated, + * during clock tree initialization, clocks could be enabled + * by bootloader, so the HW status will mismatch with clock tree + * prepare count, then clock core driver will allow parent/rate + * change since the prepare count is zero, but HW actually + * prevent the parent/rate change due to the clock is enabled. + */ + val = readl_relaxed(reg); + val &= ~(1 << PCG_CGC_SHIFT); + writel_relaxed(val, reg); } hw = clk_hw_register_composite(NULL, name, parent_names, num_parents, mux_hw, &clk_mux_ops, fd_hw, &clk_fractional_divider_ops, gate_hw, - &clk_gate_ops, CLK_SET_RATE_GATE | - CLK_SET_PARENT_GATE); + has_swrst ? &pcc_gate_ops : &clk_gate_ops, CLK_SET_RATE_GATE | + CLK_SET_PARENT_GATE | CLK_SET_RATE_NO_REPARENT); if (IS_ERR(hw)) { kfree(mux); kfree(fd); @@ -87,3 +150,20 @@ struct clk_hw *imx7ulp_clk_hw_composite(const char *name, return hw; } + +struct clk_hw *imx7ulp_clk_hw_composite(const char *name, const char * const *parent_names, + int num_parents, bool mux_present, bool rate_present, + bool gate_present, void __iomem *reg) +{ + return imx_ulp_clk_hw_composite(name, parent_names, num_parents, mux_present, rate_present, + gate_present, reg, false); +} + +struct clk_hw *imx8ulp_clk_hw_composite(const char *name, const char * const *parent_names, + int num_parents, bool mux_present, bool rate_present, + bool gate_present, void __iomem *reg, bool has_swrst) +{ + return imx_ulp_clk_hw_composite(name, parent_names, num_parents, mux_present, rate_present, + gate_present, reg, has_swrst); +} +EXPORT_SYMBOL_GPL(imx8ulp_clk_hw_composite); |