[PATCH v2 4/9] clk: msm: Add support for phase locked loops (PLLs)

Stephen Boyd
2013-10-02T19:07:19Z

Add support for MSM's PLLs (phase locked loops). This is
sufficient enough to be able to determine the rate the PLL is
running at. We can add rate setting support later when it's
needed.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
drivers/clk/Kconfig | 2 +
drivers/clk/Makefile | 1 +
drivers/clk/msm/Kconfig | 5 ++
drivers/clk/msm/Makefile | 3 +
drivers/clk/msm/clk-pll.c | 147 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/clk/msm/clk-pll.h | 45 ++++++++++++++
6 files changed, 203 insertions(+)
create mode 100644 drivers/clk/msm/Kconfig
create mode 100644 drivers/clk/msm/Makefile
create mode 100644 drivers/clk/msm/clk-pll.c
create mode 100644 drivers/clk/msm/clk-pll.h

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 279407a..efb7606 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -93,6 +93,8 @@ config CLK_PPC_CORENET
This adds the clock driver support for Freescale PowerPC corenet
platforms using common clock framework.

+source "drivers/clk/msm/Kconfig"
+
endmenu

source "drivers/clk/mvebu/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 7b11106..6838b07 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_PLAT_SPEAR) += spear/
obj-$(CONFIG_ARCH_U300) += clk-u300.o
obj-$(CONFIG_COMMON_CLK_VERSATILE) += versatile/
obj-$(CONFIG_ARCH_SIRF) += clk-prima2.o
+obj-$(CONFIG_COMMON_CLK_MSM) += msm/
obj-$(CONFIG_PLAT_ORION) += mvebu/
ifeq ($(CONFIG_COMMON_CLK), y)
obj-$(CONFIG_ARCH_MMP) += mmp/
diff --git a/drivers/clk/msm/Kconfig b/drivers/clk/msm/Kconfig
new file mode 100644
index 0000000..91558ce
--- /dev/null
+++ b/drivers/clk/msm/Kconfig
@@ -0,0 +1,5 @@
+config COMMON_CLK_MSM
+ tristate "Support for Qualcomm's MSM designs"
+ depends on OF
+ select REGMAP_MMIO
+
diff --git a/drivers/clk/msm/Makefile b/drivers/clk/msm/Makefile
new file mode 100644
index 0000000..16b750f
--- /dev/null
+++ b/drivers/clk/msm/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_COMMON_CLK_MSM) += clk-msm.o
+
+clk-msm-$(CONFIG_COMMON_CLK_MSM) += clk-pll.o
diff --git a/drivers/clk/msm/clk-pll.c b/drivers/clk/msm/clk-pll.c
new file mode 100644
index 0000000..7470bdd
--- /dev/null
+++ b/drivers/clk/msm/clk-pll.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/bitops.h>
+#include <linux/err.h>
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/clk-provider.h>
+#include <linux/regmap.h>
+
+#include <asm/div64.h>
+
+#include "clk-pll.h"
+
+#define to_clk_pll(_hw) container_of(_hw, struct clk_pll, hw)
+
+#define PLL_OUTCTRL BIT(0)
+#define PLL_BYPASSNL BIT(1)
+#define PLL_RESET_N BIT(2)
+
+static int clk_pll_enable(struct clk_hw *hw)
+{
+ struct clk_pll *pll = to_clk_pll(hw);
+ int ret;
+
+ /* Disable PLL bypass mode. */
+ ret = regmap_update_bits(hw->regmap, pll->mode_reg, PLL_BYPASSNL,
+ PLL_BYPASSNL);
+ if (ret)
+ return ret;
+
+ /*
+ * H/W requires a 5us delay between disabling the bypass and
+ * de-asserting the reset. Delay 10us just to be safe.
+ */
+ udelay(10);
+
+ /* De-assert active-low PLL reset. */
+ ret = regmap_update_bits(hw->regmap, pll->mode_reg, PLL_RESET_N,
+ PLL_RESET_N);
+ if (ret)
+ return ret;
+
+ /* Wait until PLL is locked. */
+ udelay(50);
+
+ /* Enable PLL output. */
+ ret = regmap_update_bits(hw->regmap, pll->mode_reg, PLL_OUTCTRL,
+ PLL_OUTCTRL);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void clk_pll_disable(struct clk_hw *hw)
+{
+ struct clk_pll *pll = to_clk_pll(hw);
+ u32 mask;
+
+ mask = PLL_OUTCTRL | PLL_RESET_N | PLL_BYPASSNL;
+ regmap_update_bits(hw->regmap, pll->mode_reg, mask, 0);
+}
+
+static unsigned long
+clk_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+ struct clk_pll *pll = to_clk_pll(hw);
+ u32 l, m, n;
+ unsigned long rate;
+ u64 tmp;
+
+ regmap_read(hw->regmap, pll->l_reg, &l);
+ regmap_read(hw->regmap, pll->m_reg, &m);
+ regmap_read(hw->regmap, pll->n_reg, &n);
+
+ l &= 0x3ff;
+ m &= 0x7ffff;
+ n &= 0x7ffff;
+
+ rate = parent_rate * l;
+ if (n) {
+ tmp = parent_rate;
+ tmp *= m;
+ do_div(tmp, n);
+ rate += tmp;
+ }
+ return rate;
+}
+
+const struct clk_ops clk_pll_ops = {
+ .enable = clk_pll_enable,
+ .disable = clk_pll_disable,
+ .recalc_rate = clk_pll_recalc_rate,
+};
+EXPORT_SYMBOL_GPL(clk_pll_ops);
+
+static int wait_for_pll(struct clk_pll *pll)
+{
+ u32 val;
+ int count;
+ int ret;
+ const char *name = __clk_get_name(pll->hw.clk);
+
+ /* Wait for pll to enable. */
+ for (count = 200; count > 0; count--) {
+ ret = regmap_read(pll->hw.regmap, pll->status_reg, &val);
+ if (ret)
+ return ret;
+ if (val & BIT(pll->status_bit))
+ return 0;
+ udelay(1);
+ }
+
+ WARN("%s didn't enable after voting for it!\n", name);
+ return -ETIMEDOUT;
+}
+
+static int clk_pll_vote_enable(struct clk_hw *hw)
+{
+ int ret;
+ struct clk_pll *p = to_clk_pll(__clk_get_hw(__clk_get_parent(hw->clk)));
+
+ ret = clk_enable_regmap(hw);
+ if (ret)
+ return ret;
+
+ return wait_for_pll(p);
+}
+
+const struct clk_ops clk_pll_vote_ops = {
+ .enable = clk_pll_vote_enable,
+ .disable = clk_disable_regmap,
+};
+EXPORT_SYMBOL_GPL(clk_pll_vote_ops);
diff --git a/drivers/clk/msm/clk-pll.h b/drivers/clk/msm/clk-pll.h
new file mode 100644
index 0000000..a15125c
--- /dev/null
+++ b/drivers/clk/msm/clk-pll.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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 __MSM_CLK_PLL_H__
+#define __MSM_CLK_PLL_H__
+
+#include <linux/clk-provider.h>
+
+/**
+ * struct clk_pll - phase locked loop (PLL)
+ * @l_reg: L register
+ * @m_reg: M register
+ * @n_reg: N register
+ * @config_reg: config register
+ * @mode_reg: mode register
+ * @status_reg: status register
+ * @status_bit: ANDed with @status_reg to determine if PLL is enabled
+ * @hw: handle between common and hardware-specific interfaces
+ */
+struct clk_pll {
+ u32 l_reg;
+ u32 m_reg;
+ u32 n_reg;
+ u32 config_reg;
+ u32 mode_reg;
+ u32 status_reg;
+ u8 status_bit;
+
+ struct clk_hw hw;
+};
+
+extern const struct clk_ops clk_pll_ops;
+extern const struct clk_ops clk_pll_vote_ops;