On new rockchip platform(rk3399 etc), there have dcf controller to do ddr frequency scaling, and this controller will implement in arm-trust-firmware. We add a special clock-type to handle that.
Signed-off-by: Lin Huang hl@rock-chips.com ---
Changes in v2: - use GENMASK instead val_mask - use divider_recalc_rate() instead DIV_ROUND_UP_ULL - cleanup code
Changes in v1: - None
drivers/clk/rockchip/Makefile | 1 + drivers/clk/rockchip/clk-ddr.c | 145 +++++++++++++++++++++++++++++++++++++++++ drivers/clk/rockchip/clk.c | 9 +++ drivers/clk/rockchip/clk.h | 27 ++++++++ 4 files changed, 182 insertions(+) create mode 100644 drivers/clk/rockchip/clk-ddr.c
diff --git a/drivers/clk/rockchip/Makefile b/drivers/clk/rockchip/Makefile index f47a2fa..b5f2c8e 100644 --- a/drivers/clk/rockchip/Makefile +++ b/drivers/clk/rockchip/Makefile @@ -8,6 +8,7 @@ obj-y += clk-pll.o obj-y += clk-cpu.o obj-y += clk-inverter.o obj-y += clk-mmc-phase.o +obj-y += clk-ddr.o obj-$(CONFIG_RESET_CONTROLLER) += softrst.o
obj-y += clk-rk3036.o diff --git a/drivers/clk/rockchip/clk-ddr.c b/drivers/clk/rockchip/clk-ddr.c new file mode 100644 index 0000000..b2ad57f --- /dev/null +++ b/drivers/clk/rockchip/clk-ddr.c @@ -0,0 +1,145 @@ +/* + * Copyright (c) 2016 Rockchip Electronics Co. Ltd. + * Author: Lin Huang hl@rock-chips.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/slab.h> +#include "clk.h" + +struct rockchip_ddrclk { + struct clk_hw hw; + void __iomem *reg_base; + int mux_offset; + int mux_shift; + int mux_width; + int mux_flag; + int div_shift; + int div_width; + int div_flag; + spinlock_t *lock; +}; + +#define to_rockchip_ddrclk_hw(hw) container_of(hw, struct rockchip_ddrclk, hw) + +static int rockchip_ddrclk_set_rate(struct clk_hw *hw, unsigned long drate, + unsigned long prate) +{ + struct rockchip_ddrclk *ddrclk = to_rockchip_ddrclk_hw(hw); + unsigned long flags; + + spin_lock_irqsave(ddrclk->lock, flags); + + /* TODO: set ddr rate in bl31 */ + + spin_unlock_irqrestore(ddrclk->lock, flags); + + return 0; +} + +static unsigned long +rockchip_ddrclk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct rockchip_ddrclk *ddrclk = to_rockchip_ddrclk_hw(hw); + int val; + + val = clk_readl(ddrclk->reg_base + + ddrclk->mux_offset) >> ddrclk->div_shift; + val &= GENMASK(ddrclk->div_width - 1, 0); + return divider_recalc_rate(hw, parent_rate, val, NULL, + ddrclk->div_flag); +} + +static long clk_ddrclk_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + return rate; +} + +static u8 rockchip_ddrclk_get_parent(struct clk_hw *hw) +{ + struct rockchip_ddrclk *ddrclk = to_rockchip_ddrclk_hw(hw); + int num_parents = clk_hw_get_num_parents(hw); + u32 val; + + val = clk_readl(ddrclk->reg_base + + ddrclk->mux_offset) >> ddrclk->mux_shift; + val &= GENMASK(ddrclk->mux_width - 1, 0); + + if (val >= num_parents) + return -EINVAL; + + return val; +} + +static const struct clk_ops rockchip_ddrclk_ops = { + .recalc_rate = rockchip_ddrclk_recalc_rate, + .set_rate = rockchip_ddrclk_set_rate, + .round_rate = clk_ddrclk_round_rate, + .get_parent = rockchip_ddrclk_get_parent, +}; + +struct clk *rockchip_clk_register_ddrclk(const char *name, int flags, + const char *const *parent_names, + u8 num_parents, int mux_offset, + int mux_shift, int mux_width, + int mux_flag, int div_shift, + int div_width, int div_flag, + void __iomem *reg_base, + spinlock_t *lock) +{ + struct rockchip_ddrclk *ddrclk; + struct clk_init_data init; + struct clk *clk; + + ddrclk = kzalloc(sizeof(*ddrclk), GFP_KERNEL); + if (!ddrclk) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.parent_names = parent_names; + init.num_parents = num_parents; + init.ops = &rockchip_ddrclk_ops; + + init.flags = flags; + init.flags |= CLK_SET_RATE_NO_REPARENT; + init.flags |= CLK_GET_RATE_NOCACHE; + + ddrclk->reg_base = reg_base; + ddrclk->lock = lock; + ddrclk->hw.init = &init; + ddrclk->mux_offset = mux_offset; + ddrclk->mux_shift = mux_shift; + ddrclk->mux_width = mux_width; + ddrclk->mux_flag = mux_flag; + ddrclk->div_shift = div_shift; + ddrclk->div_width = div_width; + ddrclk->div_flag = div_flag; + + clk = clk_register(NULL, &ddrclk->hw); + if (IS_ERR(clk)) { + pr_err("%s: could not register ddrclk %s\n", __func__, name); + goto free_ddrclk; + } + + return clk; + +free_ddrclk: + kfree(ddrclk); + + return NULL; +} diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c index 7ffd134..6ac1aa5 100644 --- a/drivers/clk/rockchip/clk.c +++ b/drivers/clk/rockchip/clk.c @@ -484,6 +484,15 @@ void __init rockchip_clk_register_branches( list->gate_offset, list->gate_shift, list->gate_flags, flags, &ctx->lock); break; + case branch_ddrc: + clk = rockchip_clk_register_ddrclk( + list->name, list->flags, + list->parent_names, list->num_parents, + list->muxdiv_offset, list->mux_shift, + list->mux_width, list->mux_flags, + list->div_shift, list->div_width, + list->div_flags, ctx->reg_base, &ctx->lock); + break; }
/* none of the cases above matched */ diff --git a/drivers/clk/rockchip/clk.h b/drivers/clk/rockchip/clk.h index 2194ffa..4033fe4 100644 --- a/drivers/clk/rockchip/clk.h +++ b/drivers/clk/rockchip/clk.h @@ -281,6 +281,13 @@ struct clk *rockchip_clk_register_mmc(const char *name, const char *const *parent_names, u8 num_parents, void __iomem *reg, int shift);
+struct clk *rockchip_clk_register_ddrclk(const char *name, int flags, + const char *const *parent_names, u8 num_parents, + int mux_offset, int mux_shift, int mux_width, + int mux_flag, int div_shift, int div_width, + int div_flag, void __iomem *reg_base, + spinlock_t *lock); + #define ROCKCHIP_INVERTER_HIWORD_MASK BIT(0)
struct clk *rockchip_clk_register_inverter(const char *name, @@ -299,6 +306,7 @@ enum rockchip_clk_branch_type { branch_mmc, branch_inverter, branch_factor, + branch_ddrc, };
struct rockchip_clk_branch { @@ -488,6 +496,25 @@ struct rockchip_clk_branch { .child = ch, \ }
+#define COMPOSITE_DDRC(_id, cname, pnames, f, mo, ms, mw, mf, \ + ds, dw, df) \ + { \ + .id = _id, \ + .branch_type = branch_ddrc, \ + .name = cname, \ + .parent_names = pnames, \ + .num_parents = ARRAY_SIZE(pnames), \ + .flags = f, \ + .muxdiv_offset = mo, \ + .mux_shift = ms, \ + .mux_width = mw, \ + .mux_flags = mf, \ + .div_shift = ds, \ + .div_width = dw, \ + .div_flags = df, \ + .gate_offset = -1, \ + } + #define MUX(_id, cname, pnames, f, o, s, w, mf) \ { \ .id = _id, \