[PATCH v3 2/3] clk: qcom: clk-alpha-pll: Add support for Trion PLLs

Vinod Koul
2019-06-25T06:35:13Z

From: Deepak Katragadda <dkatraga@codeaurora.org>

Add programming sequence support for managing the Trion
PLLs.

Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>
Signed-off-by: Taniya Das <tdas@codeaurora.org>
[vkoul: port to upstream and tidy-up]
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---
drivers/clk/qcom/clk-alpha-pll.c | 228 +++++++++++++++++++++++++++++++
drivers/clk/qcom/clk-alpha-pll.h | 7 +
2 files changed, 235 insertions(+)

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 2c6773188761..30210f5c6726 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -32,6 +32,7 @@
# define PLL_LOCK_DET BIT(31)

#define PLL_L_VAL(p) ((p)->offset + (p)->regs[PLL_OFF_L_VAL])
+#define PLL_CAL_L_VAL(p) ((p)->offset + (p)->regs[PLL_OFF_CAL_L_VAL])
#define PLL_ALPHA_VAL(p) ((p)->offset + (p)->regs[PLL_OFF_ALPHA_VAL])
#define PLL_ALPHA_VAL_U(p) ((p)->offset + (p)->regs[PLL_OFF_ALPHA_VAL_U])

@@ -44,14 +45,17 @@
# define PLL_VCO_MASK 0x3

#define PLL_USER_CTL_U(p) ((p)->offset + (p)->regs[PLL_OFF_USER_CTL_U])
+#define PLL_USER_CTL_U1(p) ((p)->offset + (p)->regs[PLL_OFF_USER_CTL_U1])

#define PLL_CONFIG_CTL(p) ((p)->offset + (p)->regs[PLL_OFF_CONFIG_CTL])
#define PLL_CONFIG_CTL_U(p) ((p)->offset + (p)->regs[PLL_OFF_CONFIG_CTL_U])
+#define PLL_CONFIG_CTL_U1(p) ((p)->offset + (p)->regs[PLL_OFF_CONFIG_CTL_U11])
#define PLL_TEST_CTL(p) ((p)->offset + (p)->regs[PLL_OFF_TEST_CTL])
#define PLL_TEST_CTL_U(p) ((p)->offset + (p)->regs[PLL_OFF_TEST_CTL_U])
#define PLL_STATUS(p) ((p)->offset + (p)->regs[PLL_OFF_STATUS])
#define PLL_OPMODE(p) ((p)->offset + (p)->regs[PLL_OFF_OPMODE])
#define PLL_FRAC(p) ((p)->offset + (p)->regs[PLL_OFF_FRAC])
+#define PLL_CAL_VAL(p) ((p)->offset + (p)->regs[PLL_OFF_CAL_VAL])

const u8 clk_alpha_pll_regs[][PLL_OFF_MAX_REGS] = {
[CLK_ALPHA_PLL_TYPE_DEFAULT] = {
@@ -96,6 +100,22 @@ const u8 clk_alpha_pll_regs[][PLL_OFF_MAX_REGS] = {
[PLL_OFF_OPMODE] = 0x2c,
[PLL_OFF_FRAC] = 0x38,
},
+ [CLK_ALPHA_PLL_TYPE_TRION] = {
+ [PLL_OFF_L_VAL] = 0x04,
+ [PLL_OFF_CAL_L_VAL] = 0x08,
+ [PLL_OFF_USER_CTL] = 0x0c,
+ [PLL_OFF_USER_CTL_U] = 0x10,
+ [PLL_OFF_USER_CTL_U1] = 0x14,
+ [PLL_OFF_CONFIG_CTL] = 0x18,
+ [PLL_OFF_CONFIG_CTL_U] = 0x1c,
+ [PLL_OFF_CONFIG_CTL_U1] = 0x20,
+ [PLL_OFF_TEST_CTL] = 0x24,
+ [PLL_OFF_TEST_CTL_U] = 0x28,
+ [PLL_OFF_STATUS] = 0x30,
+ [PLL_OFF_OPMODE] = 0x38,
+ [PLL_OFF_ALPHA_VAL] = 0x40,
+ [PLL_OFF_CAL_VAL] = 0x44,
+ },
};
EXPORT_SYMBOL_GPL(clk_alpha_pll_regs);

@@ -120,6 +140,10 @@ EXPORT_SYMBOL_GPL(clk_alpha_pll_regs);
#define FABIA_PLL_OUT_MASK 0x7
#define FABIA_PLL_RATE_MARGIN 500

+#define TRION_PLL_STANDBY 0x0
+#define TRION_PLL_RUN 0x1
+#define TRION_PLL_OUT_MASK 0x7
+
#define pll_alpha_width(p) \
((PLL_ALPHA_VAL_U(p) - PLL_ALPHA_VAL(p) == 4) ? \
ALPHA_REG_BITWIDTH : ALPHA_REG_16BIT_WIDTH)
@@ -730,6 +754,130 @@ static long alpha_pll_huayra_round_rate(struct clk_hw *hw, unsigned long rate,
return alpha_huayra_pll_round_rate(rate, *prate, &l, &a);
}

+static int trion_pll_is_enabled(struct clk_alpha_pll *pll,
+ struct regmap *regmap)
+{
+ u32 mode_regval, opmode_regval;
+ int ret;
+
+ ret = regmap_read(regmap, PLL_MODE(pll), &mode_regval);
+ ret |= regmap_read(regmap, PLL_OPMODE(pll), &opmode_regval);
+ if (ret)
+ return 0;
+
+ return ((opmode_regval & TRION_PLL_RUN) && (mode_regval & PLL_OUTCTRL));
+}
+
+static int clk_trion_pll_is_enabled(struct clk_hw *hw)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+
+ return trion_pll_is_enabled(pll, pll->clkr.regmap);
+}
+
+static int clk_trion_pll_enable(struct clk_hw *hw)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ struct regmap *regmap = pll->clkr.regmap;
+ u32 val;
+ int ret;
+
+ ret = regmap_read(regmap, PLL_MODE(pll), &val);
+ if (ret)
+ return ret;
+
+ /* If in FSM mode, just vote for it */
+ if (val & PLL_VOTE_FSM_ENA) {
+ ret = clk_enable_regmap(hw);
+ if (ret)
+ return ret;
+ return wait_for_pll_enable_active(pll);
+ }
+
+ /* Set operation mode to RUN */
+ regmap_write(regmap, PLL_OPMODE(pll), TRION_PLL_RUN);
+
+ ret = wait_for_pll_enable_lock(pll);
+ if (ret)
+ return ret;
+
+ /* Enable the PLL outputs */
+ ret = regmap_update_bits(regmap, PLL_USER_CTL(pll),
+ TRION_PLL_OUT_MASK, TRION_PLL_OUT_MASK);
+ if (ret)
+ return ret;
+
+ /* Enable the global PLL outputs */
+ return regmap_update_bits(regmap, PLL_MODE(pll),
+ PLL_OUTCTRL, PLL_OUTCTRL);
+}
+
+static void clk_trion_pll_disable(struct clk_hw *hw)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ struct regmap *regmap = pll->clkr.regmap;
+ u32 val;
+ int ret;
+
+ ret = regmap_read(regmap, PLL_MODE(pll), &val);
+ if (ret)
+ return;
+
+ /* If in FSM mode, just unvote it */
+ if (val & PLL_VOTE_FSM_ENA) {
+ clk_disable_regmap(hw);
+ return;
+ }
+
+ /* Disable the global PLL output */
+ ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, 0);
+ if (ret)
+ return;
+
+ /* Disable the PLL outputs */
+ ret = regmap_update_bits(regmap, PLL_USER_CTL(pll),
+ TRION_PLL_OUT_MASK, 0);
+ if (ret)
+ return;
+
+ /* Place the PLL mode in STANDBY */
+ regmap_write(regmap, PLL_OPMODE(pll), TRION_PLL_STANDBY);
+ regmap_update_bits(regmap, PLL_MODE(pll), PLL_RESET_N, PLL_RESET_N);
+}
+
+static unsigned long
+clk_trion_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ struct regmap *regmap = pll->clkr.regmap;
+ u32 l, frac;
+ u64 prate = parent_rate;
+
+ regmap_read(regmap, PLL_L_VAL(pll), &l);
+ regmap_read(regmap, PLL_ALPHA_VAL(pll), &frac);
+
+ return alpha_pll_calc_rate(prate, l, frac, ALPHA_REG_16BIT_WIDTH);
+}
+
+static long clk_trion_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ unsigned long min_freq, max_freq;
+ u32 l;
+ u64 a;
+
+ rate = alpha_pll_round_rate(rate, *prate,
+ &l, &a, ALPHA_REG_16BIT_WIDTH);
+ if (!pll->vco_table || alpha_pll_find_vco(pll, rate))
+ return rate;
+
+ min_freq = pll->vco_table[0].min_freq;
+ max_freq = pll->vco_table[pll->num_vco - 1].max_freq;
+
+ return clamp(rate, min_freq, max_freq);
+}
+
const struct clk_ops clk_alpha_pll_ops = {
.enable = clk_alpha_pll_enable,
.disable = clk_alpha_pll_disable,
@@ -760,6 +908,15 @@ const struct clk_ops clk_alpha_pll_hwfsm_ops = {
};
EXPORT_SYMBOL_GPL(clk_alpha_pll_hwfsm_ops);

+const struct clk_ops clk_trion_fixed_pll_ops = {
+ .enable = clk_trion_pll_enable,
+ .disable = clk_trion_pll_disable,
+ .is_enabled = clk_trion_pll_is_enabled,
+ .recalc_rate = clk_trion_pll_recalc_rate,
+ .round_rate = clk_trion_pll_round_rate,
+};
+EXPORT_SYMBOL_GPL(clk_trion_fixed_pll_ops);
+
static unsigned long
clk_alpha_pll_postdiv_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
{
@@ -1053,6 +1210,77 @@ static unsigned long clk_alpha_pll_postdiv_fabia_recalc_rate(struct clk_hw *hw,
return (parent_rate / div);
}

+static unsigned long
+clk_trion_pll_postdiv_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+ struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw);
+ struct regmap *regmap = pll->clkr.regmap;
+ u32 i, div = 1, val;
+
+ regmap_read(regmap, PLL_USER_CTL(pll), &val);
+
+ val >>= pll->post_div_shift;
+ val &= PLL_POST_DIV_MASK(pll);
+
+ for (i = 0; i < pll->num_post_div; i++) {
+ if (pll->post_div_table[i].val == val) {
+ div = pll->post_div_table[i].div;
+ break;
+ }
+ }
+
+ return (parent_rate / div);
+}
+
+static long
+clk_trion_pll_postdiv_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw);
+
+ return divider_round_rate(hw, rate, prate, pll->post_div_table,
+ pll->width, CLK_DIVIDER_ROUND_CLOSEST);
+};
+
+static int
+clk_trion_pll_postdiv_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw);
+ struct regmap *regmap = pll->clkr.regmap;
+ int i, val = 0, div, ret;
+
+ /*
+ * If the PLL is in FSM mode, then treat the set_rate callback
+ * as a no-operation.
+ */
+ ret = regmap_read(regmap, PLL_MODE(pll), &val);
+ if (ret)
+ return ret;
+
+ if (val & PLL_VOTE_FSM_ENA)
+ return 0;
+
+ div = DIV_ROUND_UP_ULL(parent_rate, rate);
+ for (i = 0; i < pll->num_post_div; i++) {
+ if (pll->post_div_table[i].div == div) {
+ val = pll->post_div_table[i].val;
+ break;
+ }
+ }
+
+ return regmap_update_bits(regmap, PLL_USER_CTL(pll),
+ PLL_POST_DIV_MASK(pll) << PLL_POST_DIV_SHIFT,
+ val << PLL_POST_DIV_SHIFT);
+}
+
+const struct clk_ops clk_trion_pll_postdiv_ops = {
+ .recalc_rate = clk_trion_pll_postdiv_recalc_rate,
+ .round_rate = clk_trion_pll_postdiv_round_rate,
+ .set_rate = clk_trion_pll_postdiv_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_trion_pll_postdiv_ops);
+
static long clk_alpha_pll_postdiv_fabia_round_rate(struct clk_hw *hw,
unsigned long rate, unsigned long *prate)
{
diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
index 66755f0f84fc..15f27f4b06df 100644
--- a/drivers/clk/qcom/clk-alpha-pll.h
+++ b/drivers/clk/qcom/clk-alpha-pll.h
@@ -13,22 +13,27 @@ enum {
CLK_ALPHA_PLL_TYPE_HUAYRA,
CLK_ALPHA_PLL_TYPE_BRAMMO,
CLK_ALPHA_PLL_TYPE_FABIA,
+ CLK_ALPHA_PLL_TYPE_TRION,
CLK_ALPHA_PLL_TYPE_MAX,
};

enum {
PLL_OFF_L_VAL,
+ PLL_OFF_CAL_L_VAL,
PLL_OFF_ALPHA_VAL,
PLL_OFF_ALPHA_VAL_U,
PLL_OFF_USER_CTL,
PLL_OFF_USER_CTL_U,
+ PLL_OFF_USER_CTL_U1,
PLL_OFF_CONFIG_CTL,
PLL_OFF_CONFIG_CTL_U,
+ PLL_OFF_CONFIG_CTL_U1,
PLL_OFF_TEST_CTL,
PLL_OFF_TEST_CTL_U,
PLL_OFF_STATUS,
PLL_OFF_OPMODE,
PLL_OFF_FRAC,
+ PLL_OFF_CAL_VAL,
PLL_OFF_MAX_REGS
};

@@ -117,5 +122,7 @@ void clk_alpha_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
const struct alpha_pll_config *config);
void clk_fabia_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
const struct alpha_pll_config *config);
+extern const struct clk_ops clk_trion_fixed_pll_ops;
+extern const struct clk_ops clk_trion_pll_postdiv_ops;

#endif
--
2.20.1