diff options
Diffstat (limited to 'target/linux/ipq806x/patches/0166-clk-qcom-Add-support-for-High-Frequency-PLLs-HFPLLs.patch')
-rw-r--r-- | target/linux/ipq806x/patches/0166-clk-qcom-Add-support-for-High-Frequency-PLLs-HFPLLs.patch | 348 |
1 files changed, 0 insertions, 348 deletions
diff --git a/target/linux/ipq806x/patches/0166-clk-qcom-Add-support-for-High-Frequency-PLLs-HFPLLs.patch b/target/linux/ipq806x/patches/0166-clk-qcom-Add-support-for-High-Frequency-PLLs-HFPLLs.patch deleted file mode 100644 index 037c6c4770..0000000000 --- a/target/linux/ipq806x/patches/0166-clk-qcom-Add-support-for-High-Frequency-PLLs-HFPLLs.patch +++ /dev/null @@ -1,348 +0,0 @@ -From 8a51ac2a4e36505e1ff82b0e49fd8b2edd0b7695 Mon Sep 17 00:00:00 2001 -From: Stephen Boyd <sboyd@codeaurora.org> -Date: Wed, 18 Jun 2014 14:15:58 -0700 -Subject: [PATCH 166/182] clk: qcom: Add support for High-Frequency PLLs - (HFPLLs) - -HFPLLs are the main frequency source for Krait CPU clocks. Add -support for changing the rate of these PLLs. - -Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> ---- - drivers/clk/qcom/Makefile | 1 + - drivers/clk/qcom/clk-hfpll.c | 260 ++++++++++++++++++++++++++++++++++++++++++ - drivers/clk/qcom/clk-hfpll.h | 54 +++++++++ - 3 files changed, 315 insertions(+) - create mode 100644 drivers/clk/qcom/clk-hfpll.c - create mode 100644 drivers/clk/qcom/clk-hfpll.h - ---- a/drivers/clk/qcom/Makefile -+++ b/drivers/clk/qcom/Makefile -@@ -7,6 +7,7 @@ clk-qcom-y += clk-rcg.o - clk-qcom-y += clk-rcg2.o - clk-qcom-y += clk-branch.o - clk-qcom-y += clk-generic.o -+clk-qcom-y += clk-hfpll.o - clk-qcom-y += reset.o - - obj-$(CONFIG_IPQ_GCC_806X) += gcc-ipq806x.o ---- /dev/null -+++ b/drivers/clk/qcom/clk-hfpll.c -@@ -0,0 +1,260 @@ -+/* -+ * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 and -+ * only version 2 as published by the Free Software Foundation. -+ * -+ * 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/kernel.h> -+#include <linux/module.h> -+#include <linux/init.h> -+#include <linux/regmap.h> -+#include <linux/delay.h> -+#include <linux/err.h> -+#include <linux/clk-provider.h> -+#include <linux/spinlock.h> -+ -+#include "clk-regmap.h" -+#include "clk-hfpll.h" -+ -+#define PLL_OUTCTRL BIT(0) -+#define PLL_BYPASSNL BIT(1) -+#define PLL_RESET_N BIT(2) -+ -+/* Initialize a HFPLL at a given rate and enable it. */ -+static void __clk_hfpll_init_once(struct clk_hw *hw) -+{ -+ struct clk_hfpll *h = to_clk_hfpll(hw); -+ struct hfpll_data const *hd = h->d; -+ struct regmap *regmap = h->clkr.regmap; -+ -+ if (likely(h->init_done)) -+ return; -+ -+ /* Configure PLL parameters for integer mode. */ -+ if (hd->config_val) -+ regmap_write(regmap, hd->config_reg, hd->config_val); -+ regmap_write(regmap, hd->m_reg, 0); -+ regmap_write(regmap, hd->n_reg, 1); -+ -+ if (hd->user_reg) { -+ u32 regval = hd->user_val; -+ unsigned long rate; -+ -+ rate = __clk_get_rate(hw->clk); -+ -+ /* Pick the right VCO. */ -+ if (hd->user_vco_mask && rate > hd->low_vco_max_rate) -+ regval |= hd->user_vco_mask; -+ regmap_write(regmap, hd->user_reg, regval); -+ } -+ -+ if (hd->droop_reg) -+ regmap_write(regmap, hd->droop_reg, hd->droop_val); -+ -+ h->init_done = true; -+} -+ -+static void __clk_hfpll_enable(struct clk_hw *hw) -+{ -+ struct clk_hfpll *h = to_clk_hfpll(hw); -+ struct hfpll_data const *hd = h->d; -+ struct regmap *regmap = h->clkr.regmap; -+ u32 val; -+ -+ __clk_hfpll_init_once(hw); -+ -+ /* Disable PLL bypass mode. */ -+ regmap_update_bits(regmap, hd->mode_reg, PLL_BYPASSNL, PLL_BYPASSNL); -+ -+ /* -+ * H/W requires a 5us delay between disabling the bypass and -+ * de-asserting the reset. Delay 10us just to be safe. -+ */ -+ mb(); -+ udelay(10); -+ -+ /* De-assert active-low PLL reset. */ -+ regmap_update_bits(regmap, hd->mode_reg, PLL_RESET_N, PLL_RESET_N); -+ -+ /* Wait for PLL to lock. */ -+ if (hd->status_reg) { -+ do { -+ regmap_read(regmap, hd->status_reg, &val); -+ } while (!(val & BIT(hd->lock_bit))); -+ } else { -+ mb(); -+ udelay(60); -+ } -+ -+ /* Enable PLL output. */ -+ regmap_update_bits(regmap, hd->mode_reg, PLL_OUTCTRL, PLL_OUTCTRL); -+ -+ /* Make sure the enable is done before returning. */ -+ mb(); -+} -+ -+/* Enable an already-configured HFPLL. */ -+static int clk_hfpll_enable(struct clk_hw *hw) -+{ -+ unsigned long flags; -+ struct clk_hfpll *h = to_clk_hfpll(hw); -+ struct hfpll_data const *hd = h->d; -+ struct regmap *regmap = h->clkr.regmap; -+ u32 mode; -+ -+ spin_lock_irqsave(&h->lock, flags); -+ regmap_read(regmap, hd->mode_reg, &mode); -+ if (!(mode & (PLL_BYPASSNL | PLL_RESET_N | PLL_OUTCTRL))) -+ __clk_hfpll_enable(hw); -+ spin_unlock_irqrestore(&h->lock, flags); -+ -+ return 0; -+} -+ -+static void __clk_hfpll_disable(struct clk_hw *hw) -+{ -+ struct clk_hfpll *h = to_clk_hfpll(hw); -+ struct hfpll_data const *hd = h->d; -+ struct regmap *regmap = h->clkr.regmap; -+ -+ /* -+ * Disable the PLL output, disable test mode, enable the bypass mode, -+ * and assert the reset. -+ */ -+ regmap_update_bits(regmap, hd->mode_reg, -+ PLL_BYPASSNL | PLL_RESET_N | PLL_OUTCTRL, 0); -+} -+ -+static void clk_hfpll_disable(struct clk_hw *hw) -+{ -+ struct clk_hfpll *h = to_clk_hfpll(hw); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&h->lock, flags); -+ __clk_hfpll_disable(hw); -+ spin_unlock_irqrestore(&h->lock, flags); -+} -+ -+static long clk_hfpll_round_rate(struct clk_hw *hw, unsigned long rate, -+ unsigned long *parent_rate) -+{ -+ struct clk_hfpll *h = to_clk_hfpll(hw); -+ struct hfpll_data const *hd = h->d; -+ unsigned long rrate; -+ -+ rate = clamp(rate, hd->min_rate, hd->max_rate); -+ -+ rrate = DIV_ROUND_UP(rate, *parent_rate) * *parent_rate; -+ if (rrate > hd->max_rate) -+ rrate -= *parent_rate; -+ -+ return rrate; -+} -+ -+/* -+ * For optimization reasons, assumes no downstream clocks are actively using -+ * it. -+ */ -+static int clk_hfpll_set_rate(struct clk_hw *hw, unsigned long rate, -+ unsigned long parent_rate) -+{ -+ struct clk_hfpll *h = to_clk_hfpll(hw); -+ struct hfpll_data const *hd = h->d; -+ struct regmap *regmap = h->clkr.regmap; -+ unsigned long flags; -+ u32 l_val, val; -+ bool enabled; -+ -+ l_val = rate / parent_rate; -+ -+ spin_lock_irqsave(&h->lock, flags); -+ -+ enabled = __clk_is_enabled(hw->clk); -+ if (enabled) -+ __clk_hfpll_disable(hw); -+ -+ /* Pick the right VCO. */ -+ if (hd->user_reg && hd->user_vco_mask) { -+ regmap_read(regmap, hd->user_reg, &val); -+ if (rate <= hd->low_vco_max_rate) -+ val &= ~hd->user_vco_mask; -+ else -+ val |= hd->user_vco_mask; -+ regmap_write(regmap, hd->user_reg, val); -+ } -+ -+ regmap_write(regmap, hd->l_reg, l_val); -+ -+ if (enabled) -+ __clk_hfpll_enable(hw); -+ -+ spin_unlock_irqrestore(&h->lock, flags); -+ -+ return 0; -+} -+ -+static unsigned long clk_hfpll_recalc_rate(struct clk_hw *hw, -+ unsigned long parent_rate) -+{ -+ struct clk_hfpll *h = to_clk_hfpll(hw); -+ struct hfpll_data const *hd = h->d; -+ struct regmap *regmap = h->clkr.regmap; -+ u32 l_val; -+ -+ regmap_read(regmap, hd->l_reg, &l_val); -+ -+ return l_val * parent_rate; -+} -+ -+static void clk_hfpll_init(struct clk_hw *hw) -+{ -+ struct clk_hfpll *h = to_clk_hfpll(hw); -+ struct hfpll_data const *hd = h->d; -+ struct regmap *regmap = h->clkr.regmap; -+ u32 mode, status; -+ -+ regmap_read(regmap, hd->mode_reg, &mode); -+ if (mode != (PLL_BYPASSNL | PLL_RESET_N | PLL_OUTCTRL)) { -+ __clk_hfpll_init_once(hw); -+ return; -+ } -+ -+ if (hd->status_reg) { -+ regmap_read(regmap, hd->status_reg, &status); -+ if (!(status & BIT(hd->lock_bit))) { -+ WARN(1, "HFPLL %s is ON, but not locked!\n", -+ __clk_get_name(hw->clk)); -+ clk_hfpll_disable(hw); -+ __clk_hfpll_init_once(hw); -+ } -+ } -+} -+ -+static int hfpll_is_enabled(struct clk_hw *hw) -+{ -+ struct clk_hfpll *h = to_clk_hfpll(hw); -+ struct hfpll_data const *hd = h->d; -+ struct regmap *regmap = h->clkr.regmap; -+ u32 mode; -+ -+ regmap_read(regmap, hd->mode_reg, &mode); -+ mode &= 0x7; -+ return mode == (PLL_BYPASSNL | PLL_RESET_N | PLL_OUTCTRL); -+} -+ -+const struct clk_ops clk_ops_hfpll = { -+ .enable = clk_hfpll_enable, -+ .disable = clk_hfpll_disable, -+ .is_enabled = hfpll_is_enabled, -+ .round_rate = clk_hfpll_round_rate, -+ .set_rate = clk_hfpll_set_rate, -+ .recalc_rate = clk_hfpll_recalc_rate, -+ .init = clk_hfpll_init, -+}; -+EXPORT_SYMBOL_GPL(clk_ops_hfpll); ---- /dev/null -+++ b/drivers/clk/qcom/clk-hfpll.h -@@ -0,0 +1,54 @@ -+/* -+ * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 and -+ * only version 2 as published by the Free Software Foundation. -+ * -+ * 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. -+ */ -+#ifndef __QCOM_CLK_HFPLL_H__ -+#define __QCOM_CLK_HFPLL_H__ -+ -+#include <linux/clk-provider.h> -+#include <linux/spinlock.h> -+#include "clk-regmap.h" -+ -+struct hfpll_data { -+ u32 mode_reg; -+ u32 l_reg; -+ u32 m_reg; -+ u32 n_reg; -+ u32 user_reg; -+ u32 droop_reg; -+ u32 config_reg; -+ u32 status_reg; -+ u8 lock_bit; -+ -+ u32 droop_val; -+ u32 config_val; -+ u32 user_val; -+ u32 user_vco_mask; -+ unsigned long low_vco_max_rate; -+ -+ unsigned long min_rate; -+ unsigned long max_rate; -+}; -+ -+struct clk_hfpll { -+ struct hfpll_data const *d; -+ int init_done; -+ -+ struct clk_regmap clkr; -+ spinlock_t lock; -+}; -+ -+#define to_clk_hfpll(_hw) \ -+ container_of(to_clk_regmap(_hw), struct clk_hfpll, clkr) -+ -+extern const struct clk_ops clk_ops_hfpll; -+ -+#endif |