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path: root/drivers/clk/sunxi/clk-mod0.c
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-rw-r--r--drivers/clk/sunxi/clk-mod0.c283
1 files changed, 283 insertions, 0 deletions
diff --git a/drivers/clk/sunxi/clk-mod0.c b/drivers/clk/sunxi/clk-mod0.c
new file mode 100644
index 000000000000..4a563850ee6e
--- /dev/null
+++ b/drivers/clk/sunxi/clk-mod0.c
@@ -0,0 +1,283 @@
+/*
+ * Copyright 2013 Emilio López
+ *
+ * Emilio López <emilio@elopez.com.ar>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#include "clk-factors.h"
+
+/**
+ * sun4i_get_mod0_factors() - calculates m, n factors for MOD0-style clocks
+ * MOD0 rate is calculated as follows
+ * rate = (parent_rate >> p) / (m + 1);
+ */
+
+static void sun4i_a10_get_mod0_factors(u32 *freq, u32 parent_rate,
+ u8 *n, u8 *k, u8 *m, u8 *p)
+{
+ u8 div, calcm, calcp;
+
+ /* These clocks can only divide, so we will never be able to achieve
+ * frequencies higher than the parent frequency */
+ if (*freq > parent_rate)
+ *freq = parent_rate;
+
+ div = DIV_ROUND_UP(parent_rate, *freq);
+
+ if (div < 16)
+ calcp = 0;
+ else if (div / 2 < 16)
+ calcp = 1;
+ else if (div / 4 < 16)
+ calcp = 2;
+ else
+ calcp = 3;
+
+ calcm = DIV_ROUND_UP(div, 1 << calcp);
+
+ *freq = (parent_rate >> calcp) / calcm;
+
+ /* we were called to round the frequency, we can now return */
+ if (n == NULL)
+ return;
+
+ *m = calcm - 1;
+ *p = calcp;
+}
+
+/* user manual says "n" but it's really "p" */
+static struct clk_factors_config sun4i_a10_mod0_config = {
+ .mshift = 0,
+ .mwidth = 4,
+ .pshift = 16,
+ .pwidth = 2,
+};
+
+static const struct factors_data sun4i_a10_mod0_data __initconst = {
+ .enable = 31,
+ .mux = 24,
+ .table = &sun4i_a10_mod0_config,
+ .getter = sun4i_a10_get_mod0_factors,
+};
+
+static DEFINE_SPINLOCK(sun4i_a10_mod0_lock);
+
+static void __init sun4i_a10_mod0_setup(struct device_node *node)
+{
+ sunxi_factors_register(node, &sun4i_a10_mod0_data, &sun4i_a10_mod0_lock);
+}
+CLK_OF_DECLARE(sun4i_a10_mod0, "allwinner,sun4i-a10-mod0-clk", sun4i_a10_mod0_setup);
+
+static DEFINE_SPINLOCK(sun5i_a13_mbus_lock);
+
+static void __init sun5i_a13_mbus_setup(struct device_node *node)
+{
+ struct clk *mbus = sunxi_factors_register(node, &sun4i_a10_mod0_data, &sun5i_a13_mbus_lock);
+
+ /* The MBUS clocks needs to be always enabled */
+ __clk_get(mbus);
+ clk_prepare_enable(mbus);
+}
+CLK_OF_DECLARE(sun5i_a13_mbus, "allwinner,sun5i-a13-mbus-clk", sun5i_a13_mbus_setup);
+
+struct mmc_phase_data {
+ u8 offset;
+};
+
+struct mmc_phase {
+ struct clk_hw hw;
+ void __iomem *reg;
+ struct mmc_phase_data *data;
+ spinlock_t *lock;
+};
+
+#define to_mmc_phase(_hw) container_of(_hw, struct mmc_phase, hw)
+
+static int mmc_get_phase(struct clk_hw *hw)
+{
+ struct clk *mmc, *mmc_parent, *clk = hw->clk;
+ struct mmc_phase *phase = to_mmc_phase(hw);
+ unsigned int mmc_rate, mmc_parent_rate;
+ u16 step, mmc_div;
+ u32 value;
+ u8 delay;
+
+ value = readl(phase->reg);
+ delay = (value >> phase->data->offset) & 0x3;
+
+ if (!delay)
+ return 180;
+
+ /* Get the main MMC clock */
+ mmc = clk_get_parent(clk);
+ if (!mmc)
+ return -EINVAL;
+
+ /* And its rate */
+ mmc_rate = clk_get_rate(mmc);
+ if (!mmc_rate)
+ return -EINVAL;
+
+ /* Now, get the MMC parent (most likely some PLL) */
+ mmc_parent = clk_get_parent(mmc);
+ if (!mmc_parent)
+ return -EINVAL;
+
+ /* And its rate */
+ mmc_parent_rate = clk_get_rate(mmc_parent);
+ if (!mmc_parent_rate)
+ return -EINVAL;
+
+ /* Get MMC clock divider */
+ mmc_div = mmc_parent_rate / mmc_rate;
+
+ step = DIV_ROUND_CLOSEST(360, mmc_div);
+ return delay * step;
+}
+
+static int mmc_set_phase(struct clk_hw *hw, int degrees)
+{
+ struct clk *mmc, *mmc_parent, *clk = hw->clk;
+ struct mmc_phase *phase = to_mmc_phase(hw);
+ unsigned int mmc_rate, mmc_parent_rate;
+ unsigned long flags;
+ u32 value;
+ u8 delay;
+
+ /* Get the main MMC clock */
+ mmc = clk_get_parent(clk);
+ if (!mmc)
+ return -EINVAL;
+
+ /* And its rate */
+ mmc_rate = clk_get_rate(mmc);
+ if (!mmc_rate)
+ return -EINVAL;
+
+ /* Now, get the MMC parent (most likely some PLL) */
+ mmc_parent = clk_get_parent(mmc);
+ if (!mmc_parent)
+ return -EINVAL;
+
+ /* And its rate */
+ mmc_parent_rate = clk_get_rate(mmc_parent);
+ if (!mmc_parent_rate)
+ return -EINVAL;
+
+ if (degrees != 180) {
+ u16 step, mmc_div;
+
+ /* Get MMC clock divider */
+ mmc_div = mmc_parent_rate / mmc_rate;
+
+ /*
+ * We can only outphase the clocks by multiple of the
+ * PLL's period.
+ *
+ * Since the MMC clock in only a divider, and the
+ * formula to get the outphasing in degrees is deg =
+ * 360 * delta / period
+ *
+ * If we simplify this formula, we can see that the
+ * only thing that we're concerned about is the number
+ * of period we want to outphase our clock from, and
+ * the divider set by the MMC clock.
+ */
+ step = DIV_ROUND_CLOSEST(360, mmc_div);
+ delay = DIV_ROUND_CLOSEST(degrees, step);
+ } else {
+ delay = 0;
+ }
+
+ spin_lock_irqsave(phase->lock, flags);
+ value = readl(phase->reg);
+ value &= ~GENMASK(phase->data->offset + 3, phase->data->offset);
+ value |= delay << phase->data->offset;
+ writel(value, phase->reg);
+ spin_unlock_irqrestore(phase->lock, flags);
+
+ return 0;
+}
+
+static const struct clk_ops mmc_clk_ops = {
+ .get_phase = mmc_get_phase,
+ .set_phase = mmc_set_phase,
+};
+
+static void __init sun4i_a10_mmc_phase_setup(struct device_node *node,
+ struct mmc_phase_data *data)
+{
+ const char *parent_names[1] = { of_clk_get_parent_name(node, 0) };
+ struct clk_init_data init = {
+ .num_parents = 1,
+ .parent_names = parent_names,
+ .ops = &mmc_clk_ops,
+ };
+
+ struct mmc_phase *phase;
+ struct clk *clk;
+
+ phase = kmalloc(sizeof(*phase), GFP_KERNEL);
+ if (!phase)
+ return;
+
+ phase->hw.init = &init;
+
+ phase->reg = of_iomap(node, 0);
+ if (!phase->reg)
+ goto err_free;
+
+ phase->data = data;
+ phase->lock = &sun4i_a10_mod0_lock;
+
+ if (of_property_read_string(node, "clock-output-names", &init.name))
+ init.name = node->name;
+
+ clk = clk_register(NULL, &phase->hw);
+ if (IS_ERR(clk))
+ goto err_unmap;
+
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+
+ return;
+
+err_unmap:
+ iounmap(phase->reg);
+err_free:
+ kfree(phase);
+}
+
+
+static struct mmc_phase_data mmc_output_clk = {
+ .offset = 8,
+};
+
+static struct mmc_phase_data mmc_sample_clk = {
+ .offset = 20,
+};
+
+static void __init sun4i_a10_mmc_output_setup(struct device_node *node)
+{
+ sun4i_a10_mmc_phase_setup(node, &mmc_output_clk);
+}
+CLK_OF_DECLARE(sun4i_a10_mmc_output, "allwinner,sun4i-a10-mmc-output-clk", sun4i_a10_mmc_output_setup);
+
+static void __init sun4i_a10_mmc_sample_setup(struct device_node *node)
+{
+ sun4i_a10_mmc_phase_setup(node, &mmc_sample_clk);
+}
+CLK_OF_DECLARE(sun4i_a10_mmc_sample, "allwinner,sun4i-a10-mmc-sample-clk", sun4i_a10_mmc_sample_setup);