The CPU clock provider supplies the clock to the CPU clock domain. The
composition and organization of the CPU clock provider could vary among
Exynos SoCs. A CPU clock provider can be composed of clock mux, dividers
and gates. This patch defines a new clock type for CPU clock provider and
adds infrastructure to register the CPU clock providers for Samsung
platforms.

Signed-off-by: Thomas Abraham <thomas...@samsung.com>
Reviewed-by: Tomasz Figa <tomasz.f...@gmail.com>
Acked-by: Mike Turquette <mturque...@linaro.org>
Tested-by: Javier Martinez Canillas <javier.marti...@collabora.co.uk>
Tested-by: Chander Kashyap <k.chan...@samsung.com>
---
 drivers/clk/samsung/Makefile  |    2 +-
 drivers/clk/samsung/clk-cpu.c |  335 +++++++++++++++++++++++++++++++++++++++++
 drivers/clk/samsung/clk-cpu.h |   91 +++++++++++
 3 files changed, 427 insertions(+), 1 deletions(-)
 create mode 100644 drivers/clk/samsung/clk-cpu.c
 create mode 100644 drivers/clk/samsung/clk-cpu.h

diff --git a/drivers/clk/samsung/Makefile b/drivers/clk/samsung/Makefile
index 6fb4bc6..8909c93 100644
--- a/drivers/clk/samsung/Makefile
+++ b/drivers/clk/samsung/Makefile
@@ -2,7 +2,7 @@
 # Samsung Clock specific Makefile
 #
 
-obj-$(CONFIG_COMMON_CLK)       += clk.o clk-pll.o
+obj-$(CONFIG_COMMON_CLK)       += clk.o clk-pll.o clk-cpu.o
 obj-$(CONFIG_SOC_EXYNOS3250)   += clk-exynos3250.o
 obj-$(CONFIG_ARCH_EXYNOS4)     += clk-exynos4.o
 obj-$(CONFIG_SOC_EXYNOS5250)   += clk-exynos5250.o
diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c
new file mode 100644
index 0000000..009a21b
--- /dev/null
+++ b/drivers/clk/samsung/clk-cpu.c
@@ -0,0 +1,335 @@
+/*
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ * Author: Thomas Abraham <thomas...@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This file contains the utility function to register CPU clock for Samsung
+ * Exynos platforms. A CPU clock is defined as a clock supplied to a CPU or a
+ * group of CPUs. The CPU clock is typically derived from a hierarchy of clock
+ * blocks which includes mux and divider blocks. There are a number of other
+ * auxiliary clocks supplied to the CPU domain such as the debug blocks and AXI
+ * clock for CPU domain. The rates of these auxiliary clocks are related to the
+ * CPU clock rate and this relation is usually specified in the hardware manual
+ * of the SoC or supplied after the SoC characterization.
+ *
+ * The below implementation of the CPU clock allows the rate changes of the CPU
+ * clock and the corresponding rate changes of the auxillary clocks of the CPU
+ * domain. The platform clock driver provides a clock register configuration
+ * for each configurable rate which is then used to program the clock hardware
+ * registers to acheive a fast co-oridinated rate change for all the CPU domain
+ * clocks.
+ *
+ * On a rate change request for the CPU clock, the rate change is propagated
+ * upto the PLL supplying the clock to the CPU domain clock blocks. While the
+ * CPU domain PLL is reconfigured, the CPU domain clocks are driven using an
+ * alternate clock source. If required, the alternate clock source is divided
+ * down in order to keep the output clock rate within the previous OPP limits.
+*/
+
+#include <linux/errno.h>
+#include "clk-cpu.h"
+
+#define E4210_SRC_CPU          0x0
+#define E4210_STAT_CPU         0x200
+#define E4210_DIV_CPU0         0x300
+#define E4210_DIV_CPU1         0x304
+#define E4210_DIV_STAT_CPU0    0x400
+#define E4210_DIV_STAT_CPU1    0x404
+
+#define E4210_DIV0_RATIO0_MASK 0x7
+#define E4210_DIV1_HPM_MASK    (0x7 << 4)
+#define E4210_DIV1_COPY_MASK   (0x7 << 0)
+#define E4210_MUX_HPM_MASK     (1 << 20)
+#define E4210_DIV0_ATB_SHIFT   16
+#define E4210_DIV0_ATB_MASK    (DIV_MASK << E4210_DIV0_ATB_SHIFT)
+
+#define MAX_DIV                        8
+#define DIV_MASK               7
+#define DIV_MASK_ALL           0xffffffff
+#define MUX_MASK               7
+
+/*
+ * Helper function to wait until divider(s) have stabilized after the divider
+ * value has changed.
+ */
+static void wait_until_divider_stable(void __iomem *div_reg, unsigned long 
mask)
+{
+       unsigned long timeout = jiffies + msecs_to_jiffies(10);
+
+       do {
+               if (!(readl(div_reg) & mask))
+                       return;
+       } while (time_before(jiffies, timeout));
+
+       pr_err("%s: timeout in divider stablization\n", __func__);
+}
+
+/*
+ * Helper function to wait until mux has stabilized after the mux selection
+ * value was changed.
+ */
+static void wait_until_mux_stable(void __iomem *mux_reg, u32 mux_pos,
+                                       unsigned long mux_value)
+{
+       unsigned long timeout = jiffies + msecs_to_jiffies(10);
+
+       do {
+               if (((readl(mux_reg) >> mux_pos) & MUX_MASK) == mux_value)
+                       return;
+       } while (time_before(jiffies, timeout));
+
+       pr_err("%s: re-parenting mux timed-out\n", __func__);
+}
+
+/* common round rate callback useable for all types of CPU clocks */
+static long exynos_cpuclk_round_rate(struct clk_hw *hw,
+                       unsigned long drate, unsigned long *prate)
+{
+       struct clk *parent = __clk_get_parent(hw->clk);
+       *prate = __clk_round_rate(parent, drate);
+       return *prate;
+}
+
+/* common recalc rate callback useable for all types of CPU clocks */
+static unsigned long exynos_cpuclk_recalc_rate(struct clk_hw *hw,
+                       unsigned long parent_rate)
+{
+       /*
+        * The CPU clock output (armclk) rate is the same as its parent
+        * rate. Although there exist certain dividers inside the CPU
+        * clock block that could be used to divide the parent clock,
+        * the driver does not make use of them currently, except during
+        * frequency transitions.
+        */
+       return parent_rate;
+}
+
+static const struct clk_ops exynos_cpuclk_clk_ops = {
+       .recalc_rate = exynos_cpuclk_recalc_rate,
+       .round_rate = exynos_cpuclk_round_rate,
+};
+
+/*
+ * Helper function to set the 'safe' dividers for the CPU clock. The parameters
+ * div and mask contain the divider value and the register bit mask of the
+ * dividers to be programmed.
+ */
+static void exynos_set_safe_div(void __iomem *base, unsigned long div,
+                                       unsigned long mask)
+{
+       unsigned long div0;
+
+       div0 = readl(base + E4210_DIV_CPU0);
+       div0 = (div0 & ~mask) | (div & mask);
+       writel(div0, base + E4210_DIV_CPU0);
+       wait_until_divider_stable(base + E4210_DIV_STAT_CPU0, mask);
+}
+
+/* handler for pre-rate change notification from parent clock */
+static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
+                       struct exynos_cpuclk *cpuclk, void __iomem *base)
+{
+       const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
+       unsigned long alt_prate = clk_get_rate(cpuclk->alt_parent);
+       unsigned long alt_div = 0, alt_div_mask = DIV_MASK;
+       unsigned long div0, div1 = 0, mux_reg;
+
+       /* find out the divider values to use for clock data */
+       while ((cfg_data->prate * 1000) != ndata->new_rate) {
+               if (cfg_data->prate == 0)
+                       return -EINVAL;
+               cfg_data++;
+       }
+
+       /*
+        * For the selected PLL clock frequency, get the pre-defined divider
+        * values. If the clock for sclk_hpm is not sourced from apll, then
+        * the values for DIV_COPY and DIV_HPM dividers need not be set.
+        */
+       div0 = cfg_data->div0;
+       if (test_bit(CLK_CPU_HAS_DIV1, &cpuclk->flags)) {
+               div1 = cfg_data->div1;
+               if (readl(base + E4210_SRC_CPU) & E4210_MUX_HPM_MASK)
+                       div1 = readl(base + E4210_DIV_CPU1) &
+                               (E4210_DIV1_HPM_MASK | E4210_DIV1_COPY_MASK);
+       }
+
+       spin_lock(cpuclk->lock);
+
+       /*
+        * If the new and old parent clock speed is less than the clock speed
+        * of the alternate parent, then it should be ensured that at no point
+        * the armclk speed is more than the old_prate until the dividers are
+        * set.
+        */
+       if (alt_prate > ndata->old_rate) {
+               alt_div =  DIV_ROUND_UP(alt_prate, ndata->old_rate) - 1;
+               WARN_ON(alt_div >= MAX_DIV);
+
+               if (test_bit(CLK_CPU_NEEDS_DEBUG_ALT_DIV, &cpuclk->flags)) {
+                       /*
+                        * In Exynos4210, ATB clock parent is also mout_core. So
+                        * ATB clock also needs to be mantained at safe speed.
+                        */
+                       alt_div |= E4210_DIV0_ATB_MASK;
+                       alt_div_mask |= E4210_DIV0_ATB_MASK;
+               }
+               exynos_set_safe_div(base, alt_div, alt_div_mask);
+               div0 |= alt_div;
+       }
+
+       /* select sclk_mpll as the alternate parent */
+       mux_reg = readl(base + E4210_SRC_CPU);
+       writel(mux_reg | (1 << 16), base + E4210_SRC_CPU);
+       wait_until_mux_stable(base + E4210_STAT_CPU, 16, 2);
+
+       /* alternate parent is active now. set the dividers */
+       writel(div0, base + E4210_DIV_CPU0);
+       wait_until_divider_stable(base + E4210_DIV_STAT_CPU0, DIV_MASK_ALL);
+
+       if (test_bit(CLK_CPU_HAS_DIV1, &cpuclk->flags)) {
+               writel(div1, base + E4210_DIV_CPU1);
+               wait_until_divider_stable(base + E4210_DIV_STAT_CPU1,
+                               DIV_MASK_ALL);
+       }
+
+       spin_unlock(cpuclk->lock);
+       return 0;
+}
+
+/* handler for post-rate change notification from parent clock */
+static int exynos_cpuclk_post_rate_change(struct clk_notifier_data *ndata,
+                       struct exynos_cpuclk *cpuclk, void __iomem *base)
+{
+       const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
+       unsigned long div = 0, div_mask = DIV_MASK;
+       unsigned long mux_reg;
+
+       spin_lock(cpuclk->lock);
+
+       /* select mout_apll as the alternate parent */
+       mux_reg = readl(base + E4210_SRC_CPU);
+       writel(mux_reg & ~(1 << 16), base + E4210_SRC_CPU);
+       wait_until_mux_stable(base + E4210_STAT_CPU, 16, 1);
+
+       if (test_bit(CLK_CPU_NEEDS_DEBUG_ALT_DIV, &cpuclk->flags)) {
+               /* find out the divider values to use for clock data */
+               while ((cfg_data->prate * 1000) != ndata->new_rate) {
+                       if (cfg_data->prate == 0)
+                               return -EINVAL;
+                       cfg_data++;
+               }
+
+               div |= (cfg_data->div0 & E4210_DIV0_ATB_MASK);
+               div_mask |= E4210_DIV0_ATB_MASK;
+       }
+
+       exynos_set_safe_div(base, div, div_mask);
+       spin_unlock(cpuclk->lock);
+       return 0;
+}
+
+/*
+ * This notifier function is called for the pre-rate and post-rate change
+ * notifications of the parent clock of cpuclk.
+ */
+static int exynos_cpuclk_notifier_cb(struct notifier_block *nb,
+                               unsigned long event, void *data)
+{
+       struct clk_notifier_data *ndata = data;
+       struct exynos_cpuclk *cpuclk;
+       void __iomem *base;
+       int err = 0;
+
+       cpuclk = container_of(nb, struct exynos_cpuclk, clk_nb);
+       base = cpuclk->ctrl_base;
+
+       if (event == PRE_RATE_CHANGE)
+               err = exynos_cpuclk_pre_rate_change(ndata, cpuclk, base);
+       else if (event == POST_RATE_CHANGE)
+               err = exynos_cpuclk_post_rate_change(ndata, cpuclk, base);
+
+       return notifier_from_errno(err);
+}
+
+/* helper function to register a CPU clock */
+int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
+               unsigned int lookup_id, const char *name, const char *parent,
+               const char *alt_parent, unsigned long offset,
+               const struct exynos_cpuclk_cfg_data *cfg,
+               unsigned long num_cfgs, unsigned long flags)
+{
+       struct exynos_cpuclk *cpuclk;
+       struct clk_init_data init;
+       struct clk *clk;
+       int ret = 0;
+
+       cpuclk = kzalloc(sizeof(*cpuclk), GFP_KERNEL);
+       if (!cpuclk)
+               return -ENOMEM;
+
+       init.name = name;
+       init.flags = CLK_SET_RATE_PARENT;
+       init.parent_names = &parent;
+       init.num_parents = 1;
+       init.ops = &exynos_cpuclk_clk_ops;
+
+       cpuclk->hw.init = &init;
+       cpuclk->ctrl_base = ctx->reg_base + offset;
+       cpuclk->lock = &ctx->lock;
+       cpuclk->flags = flags;
+       cpuclk->clk_nb.notifier_call = exynos_cpuclk_notifier_cb;
+
+       cpuclk->alt_parent = __clk_lookup(alt_parent);
+       if (!cpuclk->alt_parent) {
+               pr_err("%s: could not lookup alternate parent %s\n",
+                               __func__, alt_parent);
+               ret = -EINVAL;
+               goto free_cpuclk;
+       }
+
+       clk = __clk_lookup(parent);
+       if (!clk) {
+               pr_err("%s: could not lookup parent clock %s\n",
+                               __func__, parent);
+               ret = -EINVAL;
+               goto free_cpuclk;
+       }
+
+       ret = clk_notifier_register(clk, &cpuclk->clk_nb);
+       if (ret) {
+               pr_err("%s: failed to register clock notifier for %s\n",
+                               __func__, name);
+               goto free_cpuclk;
+       }
+
+       cpuclk->cfg = kmemdup(cfg, sizeof(*cfg) * num_cfgs, GFP_KERNEL);
+       if (!cpuclk->cfg) {
+               pr_err("%s: could not allocate memory for cpuclk data\n",
+                               __func__);
+               kfree(cpuclk);
+               ret = -ENOMEM;
+               goto unregister_clk_nb;
+       }
+
+       clk = clk_register(NULL, &cpuclk->hw);
+       if (IS_ERR(clk)) {
+               pr_err("%s: could not register cpuclk %s\n", __func__,  name);
+               ret = PTR_ERR(clk);
+               goto free_cpuclk_data;
+       }
+
+       samsung_clk_add_lookup(ctx, clk, lookup_id);
+       return 0;
+
+free_cpuclk_data:
+       kfree(cpuclk->cfg);
+unregister_clk_nb:
+       clk_notifier_unregister(__clk_lookup(parent), &cpuclk->clk_nb);
+free_cpuclk:
+       kfree(cpuclk);
+       return ret;
+}
diff --git a/drivers/clk/samsung/clk-cpu.h b/drivers/clk/samsung/clk-cpu.h
new file mode 100644
index 0000000..42e1905
--- /dev/null
+++ b/drivers/clk/samsung/clk-cpu.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Common Clock Framework support for all PLL's in Samsung platforms
+*/
+
+#ifndef __SAMSUNG_CLK_CPU_H
+#define __SAMSUNG_CLK_CPU_H
+
+#include "clk.h"
+
+#define E4210_CPU_DIV0(apll, pclk_dbg, atb, periph, corem1, corem0)    \
+               (((apll) << 24) | ((pclk_dbg) << 20) | ((atb) << 16) |  \
+               ((periph) << 12) | ((corem1) << 8) | ((corem0) <<  4))
+#define E4210_CPU_DIV1(hpm, copy)                                      \
+               (((hpm) << 4) | ((copy) << 0))
+
+#define E5250_CPU_DIV0(apll, pclk_dbg, atb, periph, acp, cpud)         \
+               ((((apll) << 24) | ((pclk_dbg) << 20) | ((atb) << 16) | \
+                ((periph) << 12) | ((acp) << 8) | ((cpud) << 4)))
+#define E5250_CPU_DIV1(hpm, copy)                                      \
+               (((hpm) << 4) | (copy))
+
+#define E5420_EGL_DIV0(apll, pclk_dbg, atb, cpud)                      \
+               ((((apll) << 24) | ((pclk_dbg) << 20) | ((atb) << 16) | \
+                ((cpud) << 4)))
+#define E5420_KFC_DIV(kpll, pclk, aclk)                                        
\
+               ((((kpll) << 24) | ((pclk) << 20) | ((aclk) << 4)))
+
+/**
+ * struct exynos_cpuclk_data: config data to setup cpu clocks.
+ * @prate: frequency of the primary parent clock (in KHz).
+ * @div0: value to be programmed in the div_cpu0 register.
+ * @div1: value to be programmed in the div_cpu1 register.
+ *
+ * This structure holds the divider configuration data for dividers in the CPU
+ * clock domain. The parent frequency at which these divider values are valid 
is
+ * specified in @prate. The @prate is the frequency of the primary parent 
clock.
+ * For CPU clock domains that do not have a DIV1 register, the @div1 member
+ * value is not used.
+ */
+struct exynos_cpuclk_cfg_data {
+       unsigned long   prate;
+       unsigned long   div0;
+       unsigned long   div1;
+};
+
+/**
+ * struct exynos_cpuclk: information about clock supplied to a CPU core.
+ * @hw:        handle between CCF and CPU clock.
+ * @alt_parent: alternate parent clock to use when switching the speed
+ *     of the primary parent clock.
+ * @ctrl_base: base address of the clock controller.
+ * @lock: cpu clock domain register access lock.
+ * @cfg: cpu clock rate configuration data.
+ * @num_cfgs: number of array elements in @cfg array.
+ * @clk_nb: clock notifier registered for changes in clock speed of the
+ *     primary parent clock.
+ * @flags: configuration flags for the CPU clock.
+ *
+ * This structure holds information required for programming the CPU clock for
+ * various clock speeds.
+ */
+struct exynos_cpuclk {
+       struct clk_hw                           hw;
+       struct clk                              *alt_parent;
+       void __iomem                            *ctrl_base;
+       spinlock_t                              *lock;
+       const struct exynos_cpuclk_cfg_data     *cfg;
+       const unsigned long                     num_cfgs;
+       struct notifier_block                   clk_nb;
+       unsigned long                           flags;
+
+/* The CPU clock registers has DIV1 configuration register */
+#define CLK_CPU_HAS_DIV1               (1 << 0)
+/* When ALT parent is active, debug clocks need safe divider values */
+#define CLK_CPU_NEEDS_DEBUG_ALT_DIV    (1 << 1)
+};
+
+extern int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
+                       unsigned int lookup_id, const char *name,
+                       const char *parent, const char *alt_parent,
+                       unsigned long offset,
+                       const struct exynos_cpuclk_cfg_data *cfg,
+                       unsigned long num_cfgs, unsigned long flags);
+
+#endif /* __SAMSUNG_CLK_CPU_H */
-- 
1.6.6.rc2

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