clk: mmp: add mmp specific clocks

[karo-tx-linux.git] / drivers / clk / mmp / clk-apmu.c

diff --git a/drivers/clk/mmp/clk-apmu.c b/drivers/clk/mmp/clk-apmu.c
new file mode 100644 (file)
index 0000000..abe182b
--- /dev/null
+++ b/drivers/clk/mmp/clk-apmu.c
@@ -0,0 +1,97 @@
+/*
+ * mmp AXI peripharal clock operation source file
+ *
+ * Copyright (C) 2012 Marvell
+ * Chao Xie <xiechao.mail@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+#include "clk.h"
+
+#define to_clk_apmu(clk) (container_of(clk, struct clk_apmu, clk))
+struct clk_apmu {
+       struct clk_hw   hw;
+       void __iomem    *base;
+       u32             rst_mask;
+       u32             enable_mask;
+       spinlock_t      *lock;
+};
+
+static int clk_apmu_enable(struct clk_hw *hw)
+{
+       struct clk_apmu *apmu = to_clk_apmu(hw);
+       unsigned long data;
+       unsigned long flags = 0;
+
+       if (apmu->lock)
+               spin_lock_irqsave(apmu->lock, flags);
+
+       data = readl_relaxed(apmu->base) | apmu->enable_mask;
+       writel_relaxed(data, apmu->base);
+
+       if (apmu->lock)
+               spin_unlock_irqrestore(apmu->lock, flags);
+
+       return 0;
+}
+
+static void clk_apmu_disable(struct clk_hw *hw)
+{
+       struct clk_apmu *apmu = to_clk_apmu(hw);
+       unsigned long data;
+       unsigned long flags = 0;
+
+       if (apmu->lock)
+               spin_lock_irqsave(apmu->lock, flags);
+
+       data = readl_relaxed(apmu->base) & ~apmu->enable_mask;
+       writel_relaxed(data, apmu->base);
+
+       if (apmu->lock)
+               spin_unlock_irqrestore(apmu->lock, flags);
+}
+
+struct clk_ops clk_apmu_ops = {
+       .enable = clk_apmu_enable,
+       .disable = clk_apmu_disable,
+};
+
+struct clk *mmp_clk_register_apmu(const char *name, const char *parent_name,
+               void __iomem *base, u32 enable_mask, spinlock_t *lock)
+{
+       struct clk_apmu *apmu;
+       struct clk *clk;
+       struct clk_init_data init;
+
+       apmu = kzalloc(sizeof(*apmu), GFP_KERNEL);
+       if (!apmu)
+               return NULL;
+
+       init.name = name;
+       init.ops = &clk_apmu_ops;
+       init.flags = CLK_SET_RATE_PARENT;
+       init.parent_names = (parent_name ? &parent_name : NULL);
+       init.num_parents = (parent_name ? 1 : 0);
+
+       apmu->base = base;
+       apmu->enable_mask = enable_mask;
+       apmu->lock = lock;
+       apmu->hw.init = &init;
+
+       clk = clk_register(NULL, &apmu->hw);
+
+       if (IS_ERR(clk))
+               kfree(apmu);
+
+       return clk;
+}