* Copyright (c) 2014 MundoReader S.L.
* Author: Heiko Stuebner <heiko@sntech.de>
*
+ * Copyright (c) 2016 Rockchip Electronics Co. Ltd.
+ * Author: Xing Zheng <zhengxing@rock-chips.com>
+ *
* based on
*
* samsung/clk.c
div->width = div_width;
div->lock = lock;
div->table = div_table;
- div_ops = &clk_divider_ops;
+ div_ops = (div_flags & CLK_DIVIDER_READ_ONLY)
+ ? &clk_divider_ro_ops
+ : &clk_divider_ops;
}
clk = clk_register_composite(NULL, name, parent_names, num_parents,
return clk;
}
-static struct clk *rockchip_clk_register_frac_branch(const char *name,
+struct rockchip_clk_frac {
+ struct notifier_block clk_nb;
+ struct clk_fractional_divider div;
+ struct clk_gate gate;
+
+ struct clk_mux mux;
+ const struct clk_ops *mux_ops;
+ int mux_frac_idx;
+
+ bool rate_change_remuxed;
+ int rate_change_idx;
+};
+
+#define to_rockchip_clk_frac_nb(nb) \
+ container_of(nb, struct rockchip_clk_frac, clk_nb)
+
+static int rockchip_clk_frac_notifier_cb(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct clk_notifier_data *ndata = data;
+ struct rockchip_clk_frac *frac = to_rockchip_clk_frac_nb(nb);
+ struct clk_mux *frac_mux = &frac->mux;
+ 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) {
+ frac->rate_change_idx = frac->mux_ops->get_parent(&frac_mux->hw);
+ if (frac->rate_change_idx != frac->mux_frac_idx) {
+ frac->mux_ops->set_parent(&frac_mux->hw, frac->mux_frac_idx);
+ frac->rate_change_remuxed = 1;
+ }
+ } else if (event == POST_RATE_CHANGE) {
+ /*
+ * The POST_RATE_CHANGE notifier runs directly after the
+ * divider clock is set in clk_change_rate, so we'll have
+ * remuxed back to the original parent before clk_change_rate
+ * reaches the mux itself.
+ */
+ if (frac->rate_change_remuxed) {
+ frac->mux_ops->set_parent(&frac_mux->hw, frac->rate_change_idx);
+ frac->rate_change_remuxed = 0;
+ }
+ }
+
+ return notifier_from_errno(ret);
+}
+
+static struct clk *rockchip_clk_register_frac_branch(
+ struct rockchip_clk_provider *ctx, const char *name,
const char *const *parent_names, u8 num_parents,
void __iomem *base, int muxdiv_offset, u8 div_flags,
int gate_offset, u8 gate_shift, u8 gate_flags,
- unsigned long flags, spinlock_t *lock)
+ unsigned long flags, struct rockchip_clk_branch *child,
+ spinlock_t *lock)
{
+ struct rockchip_clk_frac *frac;
struct clk *clk;
struct clk_gate *gate = NULL;
struct clk_fractional_divider *div = NULL;
const struct clk_ops *div_ops = NULL, *gate_ops = NULL;
- if (gate_offset >= 0) {
- gate = kzalloc(sizeof(*gate), GFP_KERNEL);
- if (!gate)
- return ERR_PTR(-ENOMEM);
+ if (muxdiv_offset < 0)
+ return ERR_PTR(-EINVAL);
+
+ if (child && child->branch_type != branch_mux) {
+ pr_err("%s: fractional child clock for %s can only be a mux\n",
+ __func__, name);
+ return ERR_PTR(-EINVAL);
+ }
+
+ frac = kzalloc(sizeof(*frac), GFP_KERNEL);
+ if (!frac)
+ return ERR_PTR(-ENOMEM);
+ if (gate_offset >= 0) {
+ gate = &frac->gate;
gate->flags = gate_flags;
gate->reg = base + gate_offset;
gate->bit_idx = gate_shift;
gate_ops = &clk_gate_ops;
}
- if (muxdiv_offset < 0)
- return ERR_PTR(-EINVAL);
-
- div = kzalloc(sizeof(*div), GFP_KERNEL);
- if (!div)
- return ERR_PTR(-ENOMEM);
-
+ div = &frac->div;
div->flags = div_flags;
div->reg = base + muxdiv_offset;
div->mshift = 16;
NULL, NULL,
&div->hw, div_ops,
gate ? &gate->hw : NULL, gate_ops,
- flags);
+ flags | CLK_SET_RATE_UNGATE);
+ if (IS_ERR(clk)) {
+ kfree(frac);
+ return clk;
+ }
+
+ if (child) {
+ struct clk_mux *frac_mux = &frac->mux;
+ struct clk_init_data init;
+ struct clk *mux_clk;
+ int i, ret;
+
+ frac->mux_frac_idx = -1;
+ for (i = 0; i < child->num_parents; i++) {
+ if (!strcmp(name, child->parent_names[i])) {
+ pr_debug("%s: found fractional parent in mux at pos %d\n",
+ __func__, i);
+ frac->mux_frac_idx = i;
+ break;
+ }
+ }
+
+ frac->mux_ops = &clk_mux_ops;
+ frac->clk_nb.notifier_call = rockchip_clk_frac_notifier_cb;
+
+ frac_mux->reg = base + child->muxdiv_offset;
+ frac_mux->shift = child->mux_shift;
+ frac_mux->mask = BIT(child->mux_width) - 1;
+ frac_mux->flags = child->mux_flags;
+ frac_mux->lock = lock;
+ frac_mux->hw.init = &init;
+
+ init.name = child->name;
+ init.flags = child->flags | CLK_SET_RATE_PARENT;
+ init.ops = frac->mux_ops;
+ init.parent_names = child->parent_names;
+ init.num_parents = child->num_parents;
+
+ mux_clk = clk_register(NULL, &frac_mux->hw);
+ if (IS_ERR(mux_clk))
+ return clk;
+
+ rockchip_clk_add_lookup(ctx, mux_clk, child->id);
+
+ /* notifier on the fraction divider to catch rate changes */
+ if (frac->mux_frac_idx >= 0) {
+ ret = clk_notifier_register(clk, &frac->clk_nb);
+ if (ret)
+ pr_err("%s: failed to register clock notifier for %s\n",
+ __func__, name);
+ } else {
+ pr_warn("%s: could not find %s as parent of %s, rate changes may not work\n",
+ __func__, name, child->name);
+ }
+ }
return clk;
}
-static DEFINE_SPINLOCK(clk_lock);
-static struct clk **clk_table;
-static void __iomem *reg_base;
-static struct clk_onecell_data clk_data;
-static struct device_node *cru_node;
-static struct regmap *grf;
+static struct clk *rockchip_clk_register_factor_branch(const char *name,
+ const char *const *parent_names, u8 num_parents,
+ void __iomem *base, unsigned int mult, unsigned int div,
+ int gate_offset, u8 gate_shift, u8 gate_flags,
+ unsigned long flags, spinlock_t *lock)
+{
+ struct clk *clk;
+ struct clk_gate *gate = NULL;
+ struct clk_fixed_factor *fix = NULL;
+
+ /* without gate, register a simple factor clock */
+ if (gate_offset == 0) {
+ return clk_register_fixed_factor(NULL, name,
+ parent_names[0], flags, mult,
+ div);
+ }
+
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate)
+ return ERR_PTR(-ENOMEM);
+
+ gate->flags = gate_flags;
+ gate->reg = base + gate_offset;
+ gate->bit_idx = gate_shift;
+ gate->lock = lock;
+
+ fix = kzalloc(sizeof(*fix), GFP_KERNEL);
+ if (!fix) {
+ kfree(gate);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ fix->mult = mult;
+ fix->div = div;
+
+ clk = clk_register_composite(NULL, name, parent_names, num_parents,
+ NULL, NULL,
+ &fix->hw, &clk_fixed_factor_ops,
+ &gate->hw, &clk_gate_ops, flags);
+ if (IS_ERR(clk)) {
+ kfree(fix);
+ kfree(gate);
+ }
-void __init rockchip_clk_init(struct device_node *np, void __iomem *base,
- unsigned long nr_clks)
+ return clk;
+}
+
+struct rockchip_clk_provider * __init rockchip_clk_init(struct device_node *np,
+ void __iomem *base, unsigned long nr_clks)
{
- reg_base = base;
- cru_node = np;
- grf = ERR_PTR(-EPROBE_DEFER);
+ struct rockchip_clk_provider *ctx;
+ struct clk **clk_table;
+ int i;
+
+ ctx = kzalloc(sizeof(struct rockchip_clk_provider), GFP_KERNEL);
+ if (!ctx) {
+ pr_err("%s: Could not allocate clock provider context\n",
+ __func__);
+ return ERR_PTR(-ENOMEM);
+ }
clk_table = kcalloc(nr_clks, sizeof(struct clk *), GFP_KERNEL);
- if (!clk_table)
- pr_err("%s: could not allocate clock lookup table\n", __func__);
+ if (!clk_table) {
+ pr_err("%s: Could not allocate clock lookup table\n",
+ __func__);
+ goto err_free;
+ }
+
+ for (i = 0; i < nr_clks; ++i)
+ clk_table[i] = ERR_PTR(-ENOENT);
+
+ ctx->reg_base = base;
+ ctx->clk_data.clks = clk_table;
+ ctx->clk_data.clk_num = nr_clks;
+ ctx->cru_node = np;
+ ctx->grf = ERR_PTR(-EPROBE_DEFER);
+ spin_lock_init(&ctx->lock);
- clk_data.clks = clk_table;
- clk_data.clk_num = nr_clks;
- of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
+ return ctx;
+
+err_free:
+ kfree(ctx);
+ return ERR_PTR(-ENOMEM);
}
-struct regmap *rockchip_clk_get_grf(void)
+void __init rockchip_clk_of_add_provider(struct device_node *np,
+ struct rockchip_clk_provider *ctx)
{
- if (IS_ERR(grf))
- grf = syscon_regmap_lookup_by_phandle(cru_node, "rockchip,grf");
- return grf;
+ if (of_clk_add_provider(np, of_clk_src_onecell_get,
+ &ctx->clk_data))
+ pr_err("%s: could not register clk provider\n", __func__);
}
-void rockchip_clk_add_lookup(struct clk *clk, unsigned int id)
+struct regmap *rockchip_clk_get_grf(struct rockchip_clk_provider *ctx)
{
- if (clk_table && id)
- clk_table[id] = clk;
+ if (IS_ERR(ctx->grf))
+ ctx->grf = syscon_regmap_lookup_by_phandle(ctx->cru_node, "rockchip,grf");
+ return ctx->grf;
}
-void __init rockchip_clk_register_plls(struct rockchip_pll_clock *list,
+void rockchip_clk_add_lookup(struct rockchip_clk_provider *ctx,
+ struct clk *clk, unsigned int id)
+{
+ if (ctx->clk_data.clks && id)
+ ctx->clk_data.clks[id] = clk;
+}
+
+void __init rockchip_clk_register_plls(struct rockchip_clk_provider *ctx,
+ struct rockchip_pll_clock *list,
unsigned int nr_pll, int grf_lock_offset)
{
struct clk *clk;
int idx;
for (idx = 0; idx < nr_pll; idx++, list++) {
- clk = rockchip_clk_register_pll(list->type, list->name,
+ clk = rockchip_clk_register_pll(ctx, list->type, list->name,
list->parent_names, list->num_parents,
- reg_base, list->con_offset, grf_lock_offset,
+ list->con_offset, grf_lock_offset,
list->lock_shift, list->mode_offset,
list->mode_shift, list->rate_table,
- list->pll_flags, &clk_lock);
+ list->pll_flags);
if (IS_ERR(clk)) {
pr_err("%s: failed to register clock %s\n", __func__,
list->name);
continue;
}
- rockchip_clk_add_lookup(clk, list->id);
+ rockchip_clk_add_lookup(ctx, clk, list->id);
}
}
void __init rockchip_clk_register_branches(
+ struct rockchip_clk_provider *ctx,
struct rockchip_clk_branch *list,
unsigned int nr_clk)
{
case branch_mux:
clk = clk_register_mux(NULL, list->name,
list->parent_names, list->num_parents,
- flags, reg_base + list->muxdiv_offset,
+ flags, ctx->reg_base + list->muxdiv_offset,
list->mux_shift, list->mux_width,
- list->mux_flags, &clk_lock);
+ list->mux_flags, &ctx->lock);
break;
case branch_divider:
if (list->div_table)
clk = clk_register_divider_table(NULL,
list->name, list->parent_names[0],
- flags, reg_base + list->muxdiv_offset,
+ flags, ctx->reg_base + list->muxdiv_offset,
list->div_shift, list->div_width,
list->div_flags, list->div_table,
- &clk_lock);
+ &ctx->lock);
else
clk = clk_register_divider(NULL, list->name,
list->parent_names[0], flags,
- reg_base + list->muxdiv_offset,
+ ctx->reg_base + list->muxdiv_offset,
list->div_shift, list->div_width,
- list->div_flags, &clk_lock);
+ list->div_flags, &ctx->lock);
break;
case branch_fraction_divider:
- clk = rockchip_clk_register_frac_branch(list->name,
+ clk = rockchip_clk_register_frac_branch(ctx, list->name,
list->parent_names, list->num_parents,
- reg_base, list->muxdiv_offset, list->div_flags,
+ ctx->reg_base, list->muxdiv_offset, list->div_flags,
list->gate_offset, list->gate_shift,
- list->gate_flags, flags, &clk_lock);
+ list->gate_flags, flags, list->child,
+ &ctx->lock);
break;
case branch_gate:
flags |= CLK_SET_RATE_PARENT;
clk = clk_register_gate(NULL, list->name,
list->parent_names[0], flags,
- reg_base + list->gate_offset,
- list->gate_shift, list->gate_flags, &clk_lock);
+ ctx->reg_base + list->gate_offset,
+ list->gate_shift, list->gate_flags, &ctx->lock);
break;
case branch_composite:
clk = rockchip_clk_register_branch(list->name,
list->parent_names, list->num_parents,
- reg_base, list->muxdiv_offset, list->mux_shift,
+ ctx->reg_base, list->muxdiv_offset, list->mux_shift,
list->mux_width, list->mux_flags,
list->div_shift, list->div_width,
list->div_flags, list->div_table,
list->gate_offset, list->gate_shift,
- list->gate_flags, flags, &clk_lock);
+ list->gate_flags, flags, &ctx->lock);
break;
case branch_mmc:
clk = rockchip_clk_register_mmc(
list->name,
list->parent_names, list->num_parents,
- reg_base + list->muxdiv_offset,
+ ctx->reg_base + list->muxdiv_offset,
list->div_shift
);
break;
clk = rockchip_clk_register_inverter(
list->name, list->parent_names,
list->num_parents,
- reg_base + list->muxdiv_offset,
- list->div_shift, list->div_flags, &clk_lock);
+ ctx->reg_base + list->muxdiv_offset,
+ list->div_shift, list->div_flags, &ctx->lock);
+ break;
+ case branch_factor:
+ clk = rockchip_clk_register_factor_branch(
+ list->name, list->parent_names,
+ list->num_parents, ctx->reg_base,
+ list->div_shift, list->div_width,
+ list->gate_offset, list->gate_shift,
+ list->gate_flags, flags, &ctx->lock);
break;
}
continue;
}
- rockchip_clk_add_lookup(clk, list->id);
+ rockchip_clk_add_lookup(ctx, clk, list->id);
}
}
-void __init rockchip_clk_register_armclk(unsigned int lookup_id,
+void __init rockchip_clk_register_armclk(struct rockchip_clk_provider *ctx,
+ unsigned int lookup_id,
const char *name, const char *const *parent_names,
u8 num_parents,
const struct rockchip_cpuclk_reg_data *reg_data,
struct clk *clk;
clk = rockchip_clk_register_cpuclk(name, parent_names, num_parents,
- reg_data, rates, nrates, reg_base,
- &clk_lock);
+ reg_data, rates, nrates, ctx->reg_base,
+ &ctx->lock);
if (IS_ERR(clk)) {
pr_err("%s: failed to register clock %s: %ld\n",
__func__, name, PTR_ERR(clk));
return;
}
- rockchip_clk_add_lookup(clk, lookup_id);
+ rockchip_clk_add_lookup(ctx, clk, lookup_id);
}
void __init rockchip_clk_protect_critical(const char *const clocks[],
}
}
+static void __iomem *rst_base;
static unsigned int reg_restart;
+static void (*cb_restart)(void);
static int rockchip_restart_notify(struct notifier_block *this,
unsigned long mode, void *cmd)
{
- writel(0xfdb9, reg_base + reg_restart);
+ if (cb_restart)
+ cb_restart();
+
+ writel(0xfdb9, rst_base + reg_restart);
return NOTIFY_DONE;
}
.priority = 128,
};
-void __init rockchip_register_restart_notifier(unsigned int reg)
+void __init rockchip_register_restart_notifier(struct rockchip_clk_provider *ctx,
+ unsigned int reg, void (*cb)(void))
{
int ret;
+ rst_base = ctx->reg_base;
reg_restart = reg;
+ cb_restart = cb;
ret = register_restart_handler(&rockchip_restart_handler);
if (ret)
pr_err("%s: cannot register restart handler, %d\n",
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