diff options
Diffstat (limited to 'drivers/clk/rockchip/clk-cpu.c')
| -rw-r--r-- | drivers/clk/rockchip/clk-cpu.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/drivers/clk/rockchip/clk-cpu.c b/drivers/clk/rockchip/clk-cpu.c index dcc9dcb597ae..6e91a3041a03 100644 --- a/drivers/clk/rockchip/clk-cpu.c +++ b/drivers/clk/rockchip/clk-cpu.c @@ -396,3 +396,168 @@ free_cpuclk: kfree(cpuclk); return ERR_PTR(ret); } + +static int rockchip_cpuclk_multi_pll_pre_rate_change(struct rockchip_cpuclk *cpuclk, + struct clk_notifier_data *ndata) +{ + unsigned long new_rate = roundup(ndata->new_rate, 1000); + const struct rockchip_cpuclk_rate_table *rate; + unsigned long flags; + + rate = rockchip_get_cpuclk_settings(cpuclk, new_rate); + if (!rate) { + pr_err("%s: Invalid rate : %lu for cpuclk\n", + __func__, new_rate); + return -EINVAL; + } + + if (new_rate > ndata->old_rate) { + spin_lock_irqsave(cpuclk->lock, flags); + rockchip_cpuclk_set_dividers(cpuclk, rate); + spin_unlock_irqrestore(cpuclk->lock, flags); + } + + return 0; +} + +static int rockchip_cpuclk_multi_pll_post_rate_change(struct rockchip_cpuclk *cpuclk, + struct clk_notifier_data *ndata) +{ + unsigned long new_rate = roundup(ndata->new_rate, 1000); + const struct rockchip_cpuclk_rate_table *rate; + unsigned long flags; + + rate = rockchip_get_cpuclk_settings(cpuclk, new_rate); + if (!rate) { + pr_err("%s: Invalid rate : %lu for cpuclk\n", + __func__, new_rate); + return -EINVAL; + } + + if (new_rate < ndata->old_rate) { + spin_lock_irqsave(cpuclk->lock, flags); + rockchip_cpuclk_set_dividers(cpuclk, rate); + spin_unlock_irqrestore(cpuclk->lock, flags); + } + + return 0; +} + +static int rockchip_cpuclk_multi_pll_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_multi_pll_pre_rate_change(cpuclk, ndata); + else if (event == POST_RATE_CHANGE) + ret = rockchip_cpuclk_multi_pll_post_rate_change(cpuclk, ndata); + + return notifier_from_errno(ret); +} + +struct clk *rockchip_clk_register_cpuclk_multi_pll(const char *name, + const char *const *parent_names, + u8 num_parents, void __iomem *base, + int muxdiv_offset, u8 mux_shift, + u8 mux_width, u8 mux_flags, + int div_offset, u8 div_shift, + u8 div_width, u8 div_flags, + unsigned long flags, spinlock_t *lock, + const struct rockchip_cpuclk_rate_table *rates, + int nrates) +{ + struct rockchip_cpuclk *cpuclk; + struct clk_hw *hw; + struct clk_mux *mux = NULL; + struct clk_divider *div = NULL; + const struct clk_ops *mux_ops = NULL, *div_ops = NULL; + int ret; + + if (num_parents > 1) { + mux = kzalloc(sizeof(*mux), GFP_KERNEL); + if (!mux) + return ERR_PTR(-ENOMEM); + + mux->reg = base + muxdiv_offset; + mux->shift = mux_shift; + mux->mask = BIT(mux_width) - 1; + mux->flags = mux_flags; + mux->lock = lock; + mux_ops = (mux_flags & CLK_MUX_READ_ONLY) ? &clk_mux_ro_ops + : &clk_mux_ops; + } + + if (div_width > 0) { + div = kzalloc(sizeof(*div), GFP_KERNEL); + if (!div) { + ret = -ENOMEM; + goto free_mux; + } + + div->flags = div_flags; + if (div_offset) + div->reg = base + div_offset; + else + div->reg = base + muxdiv_offset; + div->shift = div_shift; + div->width = div_width; + div->lock = lock; + div_ops = (div_flags & CLK_DIVIDER_READ_ONLY) + ? &clk_divider_ro_ops + : &clk_divider_ops; + } + + hw = clk_hw_register_composite(NULL, name, parent_names, num_parents, + mux ? &mux->hw : NULL, mux_ops, + div ? &div->hw : NULL, div_ops, + NULL, NULL, flags); + if (IS_ERR(hw)) { + ret = PTR_ERR(hw); + goto free_div; + } + + cpuclk = kzalloc(sizeof(*cpuclk), GFP_KERNEL); + if (!cpuclk) { + ret = -ENOMEM; + goto unregister_clk; + } + + cpuclk->reg_base = base; + cpuclk->lock = lock; + cpuclk->clk_nb.notifier_call = rockchip_cpuclk_multi_pll_notifier_cb; + ret = clk_notifier_register(hw->clk, &cpuclk->clk_nb); + if (ret) { + pr_err("%s: failed to register clock notifier for %s\n", + __func__, name); + goto free_cpuclk; + } + + if (nrates > 0) { + cpuclk->rate_count = nrates; + cpuclk->rate_table = kmemdup(rates, + sizeof(*rates) * nrates, + GFP_KERNEL); + if (!cpuclk->rate_table) { + ret = -ENOMEM; + goto free_cpuclk; + } + } + + return hw->clk; + +free_cpuclk: + kfree(cpuclk); +unregister_clk: + clk_hw_unregister_composite(hw); +free_div: + kfree(div); +free_mux: + kfree(mux); + + return ERR_PTR(ret); +} |