From: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
To: agross@kernel.org, bjorn.andersson@linaro.org,
mturquette@baylibre.com, sboyd@kernel.org, robh+dt@kernel.org,
mark.rutland@arm.com, vinod.koul@linaro.org,
psodagud@codeaurora.org, tsoni@codeaurora.org,
jshriram@codeaurora.org, tdas@codeaurora.org,
vnkgutta@codeaurora.org, linux-arm-msm@vger.kernel.org,
linux-clk@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 4/7] clk: qcom: clk-alpha-pll: Add support for controlling Lucid PLLs
Date: Fri, 24 Jan 2020 14:32:24 -0800 [thread overview]
Message-ID: <1579905147-12142-5-git-send-email-vnkgutta@codeaurora.org> (raw)
In-Reply-To: <1579905147-12142-1-git-send-email-vnkgutta@codeaurora.org>
From: Taniya Das <tdas@codeaurora.org>
Add programming sequence support for managing the Lucid PLLs.
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
---
drivers/clk/qcom/clk-alpha-pll.c | 190 +++++++++++++++++++++++++++++++++++++++
drivers/clk/qcom/clk-alpha-pll.h | 12 +++
2 files changed, 202 insertions(+)
diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 1b073b2..4258ab0 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -52,6 +52,7 @@
#define PLL_CONFIG_CTL_U1(p) ((p)->offset + (p)->regs[PLL_OFF_CONFIG_CTL_U1])
#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_TEST_CTL_U1(p) ((p)->offset + (p)->regs[PLL_OFF_TEST_CTL_U1])
#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])
@@ -116,6 +117,22 @@
[PLL_OFF_ALPHA_VAL] = 0x40,
[PLL_OFF_CAL_VAL] = 0x44,
},
+ [CLK_ALPHA_PLL_TYPE_LUCID] = {
+ [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_TEST_CTL_U1] = 0x2c,
+ [PLL_OFF_STATUS] = 0x30,
+ [PLL_OFF_OPMODE] = 0x38,
+ [PLL_OFF_ALPHA_VAL] = 0x40,
+ },
};
EXPORT_SYMBOL_GPL(clk_alpha_pll_regs);
@@ -139,6 +156,10 @@
#define PLL_OUT_MASK 0x7
#define PLL_RATE_MARGIN 500
+/* LUCID PLL specific settings and offsets */
+#define LUCID_PLL_CAL_VAL 0x44
+#define LUCID_PCAL_DONE BIT(26)
+
#define pll_alpha_width(p) \
((PLL_ALPHA_VAL_U(p) - PLL_ALPHA_VAL(p) == 4) ? \
ALPHA_REG_BITWIDTH : ALPHA_REG_16BIT_WIDTH)
@@ -1367,3 +1388,172 @@ static int clk_alpha_pll_postdiv_fabia_set_rate(struct clk_hw *hw,
.set_rate = clk_alpha_pll_postdiv_fabia_set_rate,
};
EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_fabia_ops);
+
+void clk_lucid_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
+ const struct alpha_pll_config *config)
+{
+ if (config->l)
+ regmap_write(regmap, PLL_L_VAL(pll), config->l);
+
+ regmap_write(regmap, PLL_CAL_L_VAL(pll), LUCID_PLL_CAL_VAL);
+
+ if (config->alpha)
+ regmap_write(regmap, PLL_ALPHA_VAL(pll), config->alpha);
+
+ if (config->config_ctl_val)
+ regmap_write(regmap, PLL_CONFIG_CTL(pll),
+ config->config_ctl_val);
+
+ if (config->config_ctl_hi_val)
+ regmap_write(regmap, PLL_CONFIG_CTL_U(pll),
+ config->config_ctl_hi_val);
+
+ if (config->config_ctl_hi1_val)
+ regmap_write(regmap, PLL_CONFIG_CTL_U1(pll),
+ config->config_ctl_hi1_val);
+
+ if (config->user_ctl_val)
+ regmap_write(regmap, PLL_USER_CTL(pll),
+ config->user_ctl_val);
+
+ if (config->user_ctl_hi_val)
+ regmap_write(regmap, PLL_USER_CTL_U(pll),
+ config->user_ctl_hi_val);
+
+ if (config->user_ctl_hi1_val)
+ regmap_write(regmap, PLL_USER_CTL_U1(pll),
+ config->user_ctl_hi1_val);
+
+ if (config->test_ctl_val)
+ regmap_write(regmap, PLL_TEST_CTL(pll),
+ config->test_ctl_val);
+
+ if (config->test_ctl_hi_val)
+ regmap_write(regmap, PLL_TEST_CTL_U(pll),
+ config->test_ctl_hi_val);
+
+ if (config->test_ctl_hi1_val)
+ regmap_write(regmap, PLL_TEST_CTL_U1(pll),
+ config->test_ctl_hi1_val);
+
+ regmap_update_bits(regmap, PLL_MODE(pll), PLL_UPDATE_BYPASS,
+ PLL_UPDATE_BYPASS);
+
+ /* Disable PLL output */
+ regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, 0);
+
+ /* Set operation mode to OFF */
+ regmap_write(regmap, PLL_OPMODE(pll), PLL_STANDBY);
+
+ /* PLL should be in OFF mode before continuing */
+ wmb();
+
+ /* Place the PLL in STANDBY mode */
+ regmap_update_bits(regmap, PLL_MODE(pll), PLL_RESET_N, PLL_RESET_N);
+}
+EXPORT_SYMBOL_GPL(clk_lucid_pll_configure);
+
+/*
+ * The Lucid PLL requires a power-on self-calibration which happens when the
+ * PLL comes out of reset. Calibrate in case it is not completed.
+ */
+static int alpha_pll_lucid_prepare(struct clk_hw *hw)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ u32 regval;
+ int ret;
+
+ /* Return early if calibration is not needed. */
+ regmap_read(pll->clkr.regmap, PLL_STATUS(pll), ®val);
+ if (regval & LUCID_PCAL_DONE)
+ return 0;
+
+ ret = clk_trion_pll_enable(hw);
+ if (ret)
+ return ret;
+
+ clk_trion_pll_disable(hw);
+
+ return 0;
+}
+
+static int alpha_pll_lucid_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long prate)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ unsigned long rrate;
+ u32 regval, l, alpha_width = pll_alpha_width(pll);
+ u64 a;
+ int ret;
+
+ rrate = alpha_pll_round_rate(rate, prate, &l, &a, alpha_width);
+
+ /*
+ * Due to a limited number of bits for fractional rate programming, the
+ * rounded up rate could be marginally higher than the requested rate.
+ */
+ if (rrate > (rate + PLL_RATE_MARGIN) || rrate < rate) {
+ pr_err("Call set rate on the PLL with rounded rates!\n");
+ return -EINVAL;
+ }
+
+ regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);
+ regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a);
+
+ /* Latch the PLL input */
+ ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll),
+ PLL_UPDATE, PLL_UPDATE);
+ if (ret)
+ return ret;
+
+ /* Wait for 2 reference cycles before checking the ACK bit. */
+ udelay(1);
+ regmap_read(pll->clkr.regmap, PLL_MODE(pll), ®val);
+ if (!(regval & ALPHA_PLL_ACK_LATCH)) {
+ WARN(1, "PLL latch failed. Output may be unstable!\n");
+ return -EINVAL;
+ }
+
+ /* Return the latch input to 0 */
+ ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll),
+ PLL_UPDATE, 0);
+ if (ret)
+ return ret;
+
+ if (clk_hw_is_enabled(hw)) {
+ ret = wait_for_pll_enable_lock(pll);
+ if (ret)
+ return ret;
+ }
+
+ /* Wait for PLL output to stabilize */
+ udelay(100);
+ return 0;
+}
+
+const struct clk_ops clk_alpha_pll_lucid_ops = {
+ .prepare = alpha_pll_lucid_prepare,
+ .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_alpha_pll_round_rate,
+ .set_rate = alpha_pll_lucid_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_alpha_pll_lucid_ops);
+
+const struct clk_ops clk_alpha_pll_fixed_lucid_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_alpha_pll_round_rate,
+};
+EXPORT_SYMBOL_GPL(clk_alpha_pll_fixed_lucid_ops);
+
+const struct clk_ops clk_alpha_pll_postdiv_lucid_ops = {
+ .recalc_rate = clk_alpha_pll_postdiv_fabia_recalc_rate,
+ .round_rate = clk_alpha_pll_postdiv_fabia_round_rate,
+ .set_rate = clk_alpha_pll_postdiv_fabia_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_lucid_ops);
diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
index fbc1f67..704674a 100644
--- a/drivers/clk/qcom/clk-alpha-pll.h
+++ b/drivers/clk/qcom/clk-alpha-pll.h
@@ -14,6 +14,7 @@ enum {
CLK_ALPHA_PLL_TYPE_BRAMMO,
CLK_ALPHA_PLL_TYPE_FABIA,
CLK_ALPHA_PLL_TYPE_TRION,
+ CLK_ALPHA_PLL_TYPE_LUCID,
CLK_ALPHA_PLL_TYPE_MAX,
};
@@ -30,6 +31,7 @@ enum {
PLL_OFF_CONFIG_CTL_U1,
PLL_OFF_TEST_CTL,
PLL_OFF_TEST_CTL_U,
+ PLL_OFF_TEST_CTL_U1,
PLL_OFF_STATUS,
PLL_OFF_OPMODE,
PLL_OFF_FRAC,
@@ -94,10 +96,13 @@ struct alpha_pll_config {
u32 alpha_hi;
u32 config_ctl_val;
u32 config_ctl_hi_val;
+ u32 config_ctl_hi1_val;
u32 user_ctl_val;
u32 user_ctl_hi_val;
+ u32 user_ctl_hi1_val;
u32 test_ctl_val;
u32 test_ctl_hi_val;
+ u32 test_ctl_hi1_val;
u32 main_output_mask;
u32 aux_output_mask;
u32 aux2_output_mask;
@@ -123,10 +128,17 @@ struct alpha_pll_config {
extern const struct clk_ops clk_alpha_pll_fixed_fabia_ops;
extern const struct clk_ops clk_alpha_pll_postdiv_fabia_ops;
+extern const struct clk_ops clk_alpha_pll_lucid_ops;
+extern const struct clk_ops clk_alpha_pll_fixed_lucid_ops;
+extern const struct clk_ops clk_alpha_pll_postdiv_lucid_ops;
+
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);
+void clk_lucid_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;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-01-24 22:33 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-24 22:32 [PATCH v2 0/7] Add device tree and clock drivers for SM8250 SoC Venkata Narendra Kumar Gutta
2020-01-24 22:32 ` [PATCH v2 1/7] dt-bindings: clock: Add RPMHCC bindings for SM8250 Venkata Narendra Kumar Gutta
2020-02-12 23:05 ` Stephen Boyd
2020-01-24 22:32 ` [PATCH v2 2/7] clk: qcom: rpmh: Add support for RPMH clocks on SM8250 Venkata Narendra Kumar Gutta
2020-02-12 23:05 ` Stephen Boyd
2020-01-24 22:32 ` [PATCH v2 3/7] clk: qcom: clk-alpha-pll: Refactor and cleanup trion PLL Venkata Narendra Kumar Gutta
2020-02-12 23:09 ` Stephen Boyd
2020-01-24 22:32 ` Venkata Narendra Kumar Gutta [this message]
2020-02-05 19:33 ` [PATCH v2 4/7] clk: qcom: clk-alpha-pll: Add support for controlling Lucid PLLs Stephen Boyd
2020-02-10 5:56 ` Vinod Koul
2020-01-24 22:32 ` [PATCH v2 5/7] dt-bindings: clock: Add SM8250 GCC clock bindings Venkata Narendra Kumar Gutta
2020-02-04 7:13 ` Stephen Boyd
2020-01-24 22:32 ` [PATCH v2 7/7] arm64: dts: qcom: sm8250: Add sm8250 dts file Venkata Narendra Kumar Gutta
2020-01-24 22:49 ` Bjorn Andersson
2020-02-05 19:47 ` Stephen Boyd
2020-02-14 13:14 ` Vinod Koul
[not found] ` <1579905147-12142-7-git-send-email-vnkgutta@codeaurora.org>
2020-02-05 19:40 ` [PATCH v2 6/7] clk: qcom: gcc: Add global clock controller driver for SM8250 Stephen Boyd
2020-02-14 13:09 ` Vinod Koul
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