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path: root/drivers/clk/qcom/clk-rcg.c
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Diffstat (limited to 'drivers/clk/qcom/clk-rcg.c')
-rw-r--r--drivers/clk/qcom/clk-rcg.c188
1 files changed, 150 insertions, 38 deletions
diff --git a/drivers/clk/qcom/clk-rcg.c b/drivers/clk/qcom/clk-rcg.c
index 0039bd7d3965..7b3d62674203 100644
--- a/drivers/clk/qcom/clk-rcg.c
+++ b/drivers/clk/qcom/clk-rcg.c
@@ -47,15 +47,20 @@ static u8 clk_rcg_get_parent(struct clk_hw *hw)
struct clk_rcg *rcg = to_clk_rcg(hw);
int num_parents = __clk_get_num_parents(hw->clk);
u32 ns;
- int i;
+ int i, ret;
- regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
+ ret = regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
+ if (ret)
+ goto err;
ns = ns_to_src(&rcg->s, ns);
for (i = 0; i < num_parents; i++)
- if (ns == rcg->s.parent_map[i])
+ if (ns == rcg->s.parent_map[i].cfg)
return i;
- return -EINVAL;
+err:
+ pr_debug("%s: Clock %s has invalid parent, using default.\n",
+ __func__, __clk_get_name(hw->clk));
+ return 0;
}
static int reg_to_bank(struct clk_dyn_rcg *rcg, u32 bank)
@@ -70,21 +75,28 @@ static u8 clk_dyn_rcg_get_parent(struct clk_hw *hw)
int num_parents = __clk_get_num_parents(hw->clk);
u32 ns, reg;
int bank;
- int i;
+ int i, ret;
struct src_sel *s;
- regmap_read(rcg->clkr.regmap, rcg->bank_reg, &reg);
+ ret = regmap_read(rcg->clkr.regmap, rcg->bank_reg, &reg);
+ if (ret)
+ goto err;
bank = reg_to_bank(rcg, reg);
s = &rcg->s[bank];
- regmap_read(rcg->clkr.regmap, rcg->ns_reg[bank], &ns);
+ ret = regmap_read(rcg->clkr.regmap, rcg->ns_reg[bank], &ns);
+ if (ret)
+ goto err;
ns = ns_to_src(s, ns);
for (i = 0; i < num_parents; i++)
- if (ns == s->parent_map[i])
+ if (ns == s->parent_map[i].cfg)
return i;
- return -EINVAL;
+err:
+ pr_debug("%s: Clock %s has invalid parent, using default.\n",
+ __func__, __clk_get_name(hw->clk));
+ return 0;
}
static int clk_rcg_set_parent(struct clk_hw *hw, u8 index)
@@ -93,7 +105,7 @@ static int clk_rcg_set_parent(struct clk_hw *hw, u8 index)
u32 ns;
regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
- ns = src_to_ns(&rcg->s, rcg->s.parent_map[index], ns);
+ ns = src_to_ns(&rcg->s, rcg->s.parent_map[index].cfg, ns);
regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns);
return 0;
@@ -191,10 +203,10 @@ static u32 mn_to_reg(struct mn *mn, u32 m, u32 n, u32 val)
return val;
}
-static void configure_bank(struct clk_dyn_rcg *rcg, const struct freq_tbl *f)
+static int configure_bank(struct clk_dyn_rcg *rcg, const struct freq_tbl *f)
{
u32 ns, md, reg;
- int bank, new_bank;
+ int bank, new_bank, ret, index;
struct mn *mn;
struct pre_div *p;
struct src_sel *s;
@@ -206,38 +218,56 @@ static void configure_bank(struct clk_dyn_rcg *rcg, const struct freq_tbl *f)
enabled = __clk_is_enabled(hw->clk);
- regmap_read(rcg->clkr.regmap, rcg->bank_reg, &reg);
+ ret = regmap_read(rcg->clkr.regmap, rcg->bank_reg, &reg);
+ if (ret)
+ return ret;
bank = reg_to_bank(rcg, reg);
new_bank = enabled ? !bank : bank;
ns_reg = rcg->ns_reg[new_bank];
- regmap_read(rcg->clkr.regmap, ns_reg, &ns);
+ ret = regmap_read(rcg->clkr.regmap, ns_reg, &ns);
+ if (ret)
+ return ret;
if (banked_mn) {
mn = &rcg->mn[new_bank];
md_reg = rcg->md_reg[new_bank];
ns |= BIT(mn->mnctr_reset_bit);
- regmap_write(rcg->clkr.regmap, ns_reg, ns);
+ ret = regmap_write(rcg->clkr.regmap, ns_reg, ns);
+ if (ret)
+ return ret;
- regmap_read(rcg->clkr.regmap, md_reg, &md);
+ ret = regmap_read(rcg->clkr.regmap, md_reg, &md);
+ if (ret)
+ return ret;
md = mn_to_md(mn, f->m, f->n, md);
- regmap_write(rcg->clkr.regmap, md_reg, md);
-
+ ret = regmap_write(rcg->clkr.regmap, md_reg, md);
+ if (ret)
+ return ret;
ns = mn_to_ns(mn, f->m, f->n, ns);
- regmap_write(rcg->clkr.regmap, ns_reg, ns);
+ ret = regmap_write(rcg->clkr.regmap, ns_reg, ns);
+ if (ret)
+ return ret;
/* Two NS registers means mode control is in NS register */
if (rcg->ns_reg[0] != rcg->ns_reg[1]) {
ns = mn_to_reg(mn, f->m, f->n, ns);
- regmap_write(rcg->clkr.regmap, ns_reg, ns);
+ ret = regmap_write(rcg->clkr.regmap, ns_reg, ns);
+ if (ret)
+ return ret;
} else {
reg = mn_to_reg(mn, f->m, f->n, reg);
- regmap_write(rcg->clkr.regmap, rcg->bank_reg, reg);
+ ret = regmap_write(rcg->clkr.regmap, rcg->bank_reg,
+ reg);
+ if (ret)
+ return ret;
}
ns &= ~BIT(mn->mnctr_reset_bit);
- regmap_write(rcg->clkr.regmap, ns_reg, ns);
+ ret = regmap_write(rcg->clkr.regmap, ns_reg, ns);
+ if (ret)
+ return ret;
}
if (banked_p) {
@@ -246,14 +276,24 @@ static void configure_bank(struct clk_dyn_rcg *rcg, const struct freq_tbl *f)
}
s = &rcg->s[new_bank];
- ns = src_to_ns(s, s->parent_map[f->src], ns);
- regmap_write(rcg->clkr.regmap, ns_reg, ns);
+ index = qcom_find_src_index(hw, s->parent_map, f->src);
+ if (index < 0)
+ return index;
+ ns = src_to_ns(s, s->parent_map[index].cfg, ns);
+ ret = regmap_write(rcg->clkr.regmap, ns_reg, ns);
+ if (ret)
+ return ret;
if (enabled) {
- regmap_read(rcg->clkr.regmap, rcg->bank_reg, &reg);
+ ret = regmap_read(rcg->clkr.regmap, rcg->bank_reg, &reg);
+ if (ret)
+ return ret;
reg ^= BIT(rcg->mux_sel_bit);
- regmap_write(rcg->clkr.regmap, rcg->bank_reg, reg);
+ ret = regmap_write(rcg->clkr.regmap, rcg->bank_reg, reg);
+ if (ret)
+ return ret;
}
+ return 0;
}
static int clk_dyn_rcg_set_parent(struct clk_hw *hw, u8 index)
@@ -279,10 +319,8 @@ static int clk_dyn_rcg_set_parent(struct clk_hw *hw, u8 index)
if (banked_p)
f.pre_div = ns_to_pre_div(&rcg->p[bank], ns) + 1;
- f.src = index;
- configure_bank(rcg, &f);
-
- return 0;
+ f.src = qcom_find_src_index(hw, rcg->s[bank].parent_map, index);
+ return configure_bank(rcg, &f);
}
/*
@@ -369,17 +407,23 @@ clk_dyn_rcg_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
static long _freq_tbl_determine_rate(struct clk_hw *hw,
const struct freq_tbl *f, unsigned long rate,
unsigned long min_rate, unsigned long max_rate,
- unsigned long *p_rate, struct clk_hw **p_hw)
+ unsigned long *p_rate, struct clk_hw **p_hw,
+ const struct parent_map *parent_map)
{
unsigned long clk_flags;
struct clk *p;
+ int index;
f = qcom_find_freq(f, rate);
if (!f)
return -EINVAL;
+ index = qcom_find_src_index(hw, parent_map, f->src);
+ if (index < 0)
+ return index;
+
clk_flags = __clk_get_flags(hw->clk);
- p = clk_get_parent_by_index(hw->clk, f->src);
+ p = clk_get_parent_by_index(hw->clk, index);
if (clk_flags & CLK_SET_RATE_PARENT) {
rate = rate * f->pre_div;
if (f->n) {
@@ -404,7 +448,7 @@ static long clk_rcg_determine_rate(struct clk_hw *hw, unsigned long rate,
struct clk_rcg *rcg = to_clk_rcg(hw);
return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, min_rate,
- max_rate, p_rate, p);
+ max_rate, p_rate, p, rcg->s.parent_map);
}
static long clk_dyn_rcg_determine_rate(struct clk_hw *hw, unsigned long rate,
@@ -412,9 +456,16 @@ static long clk_dyn_rcg_determine_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *p_rate, struct clk_hw **p)
{
struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
+ u32 reg;
+ int bank;
+ struct src_sel *s;
+
+ regmap_read(rcg->clkr.regmap, rcg->bank_reg, &reg);
+ bank = reg_to_bank(rcg, reg);
+ s = &rcg->s[bank];
return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, min_rate,
- max_rate, p_rate, p);
+ max_rate, p_rate, p, s->parent_map);
}
static long clk_rcg_bypass_determine_rate(struct clk_hw *hw, unsigned long rate,
@@ -424,8 +475,9 @@ static long clk_rcg_bypass_determine_rate(struct clk_hw *hw, unsigned long rate,
struct clk_rcg *rcg = to_clk_rcg(hw);
const struct freq_tbl *f = rcg->freq_tbl;
struct clk *p;
+ int index = qcom_find_src_index(hw, rcg->s.parent_map, f->src);
- p = clk_get_parent_by_index(hw->clk, f->src);
+ p = clk_get_parent_by_index(hw->clk, index);
*p_hw = __clk_get_hw(p);
*p_rate = __clk_round_rate(p, rate);
@@ -495,6 +547,57 @@ static int clk_rcg_bypass_set_rate(struct clk_hw *hw, unsigned long rate,
return __clk_rcg_set_rate(rcg, rcg->freq_tbl);
}
+/*
+ * This type of clock has a glitch-free mux that switches between the output of
+ * the M/N counter and an always on clock source (XO). When clk_set_rate() is
+ * called we need to make sure that we don't switch to the M/N counter if it
+ * isn't clocking because the mux will get stuck and the clock will stop
+ * outputting a clock. This can happen if the framework isn't aware that this
+ * clock is on and so clk_set_rate() doesn't turn on the new parent. To fix
+ * this we switch the mux in the enable/disable ops and reprogram the M/N
+ * counter in the set_rate op. We also make sure to switch away from the M/N
+ * counter in set_rate if software thinks the clock is off.
+ */
+static int clk_rcg_lcc_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_rcg *rcg = to_clk_rcg(hw);
+ const struct freq_tbl *f;
+ int ret;
+ u32 gfm = BIT(10);
+
+ f = qcom_find_freq(rcg->freq_tbl, rate);
+ if (!f)
+ return -EINVAL;
+
+ /* Switch to XO to avoid glitches */
+ regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, 0);
+ ret = __clk_rcg_set_rate(rcg, f);
+ /* Switch back to M/N if it's clocking */
+ if (__clk_is_enabled(hw->clk))
+ regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, gfm);
+
+ return ret;
+}
+
+static int clk_rcg_lcc_enable(struct clk_hw *hw)
+{
+ struct clk_rcg *rcg = to_clk_rcg(hw);
+ u32 gfm = BIT(10);
+
+ /* Use M/N */
+ return regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, gfm);
+}
+
+static void clk_rcg_lcc_disable(struct clk_hw *hw)
+{
+ struct clk_rcg *rcg = to_clk_rcg(hw);
+ u32 gfm = BIT(10);
+
+ /* Use XO */
+ regmap_update_bits(rcg->clkr.regmap, rcg->ns_reg, gfm, 0);
+}
+
static int __clk_dyn_rcg_set_rate(struct clk_hw *hw, unsigned long rate)
{
struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
@@ -504,9 +607,7 @@ static int __clk_dyn_rcg_set_rate(struct clk_hw *hw, unsigned long rate)
if (!f)
return -EINVAL;
- configure_bank(rcg, f);
-
- return 0;
+ return configure_bank(rcg, f);
}
static int clk_dyn_rcg_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -543,6 +644,17 @@ const struct clk_ops clk_rcg_bypass_ops = {
};
EXPORT_SYMBOL_GPL(clk_rcg_bypass_ops);
+const struct clk_ops clk_rcg_lcc_ops = {
+ .enable = clk_rcg_lcc_enable,
+ .disable = clk_rcg_lcc_disable,
+ .get_parent = clk_rcg_get_parent,
+ .set_parent = clk_rcg_set_parent,
+ .recalc_rate = clk_rcg_recalc_rate,
+ .determine_rate = clk_rcg_determine_rate,
+ .set_rate = clk_rcg_lcc_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_rcg_lcc_ops);
+
const struct clk_ops clk_dyn_rcg_ops = {
.enable = clk_enable_regmap,
.is_enabled = clk_is_enabled_regmap,
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.