diff options
author | Ulf Hansson <ulf.hansson@linaro.org> | 2013-04-03 14:26:57 +0200 |
---|---|---|
committer | Mike Turquette <mturquette@linaro.org> | 2013-04-10 11:27:56 -0700 |
commit | 5b82d03b74cadb681377e1c2494c477185bf6619 (patch) | |
tree | c6342e1461c7a35a098c236b3ee5e307472712fe /drivers/clk/ux500 | |
parent | 4cb24e68a5af427651b3529cd3fe382fb9ba1544 (diff) | |
download | op-kernel-dev-5b82d03b74cadb681377e1c2494c477185bf6619.zip op-kernel-dev-5b82d03b74cadb681377e1c2494c477185bf6619.tar.gz |
clk: ux500: Add support for sysctrl clocks
The abx500 sysctrl clocks are using the ab8500 sysctrl driver to
modify the clock hardware. Sysctrl clocks are represented by a
ab8500 sysctrl register and with a corresponding bitmask.
The sysctrl clocks are slow path clocks, which means clk_prepare
and clk_unprepare will be used to gate|ungate these clocks.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/clk/ux500')
-rw-r--r-- | drivers/clk/ux500/Makefile | 1 | ||||
-rw-r--r-- | drivers/clk/ux500/clk-sysctrl.c | 221 | ||||
-rw-r--r-- | drivers/clk/ux500/clk.h | 29 |
3 files changed, 251 insertions, 0 deletions
diff --git a/drivers/clk/ux500/Makefile b/drivers/clk/ux500/Makefile index bcc0c11..c6a806e 100644 --- a/drivers/clk/ux500/Makefile +++ b/drivers/clk/ux500/Makefile @@ -5,6 +5,7 @@ # Clock types obj-y += clk-prcc.o obj-y += clk-prcmu.o +obj-y += clk-sysctrl.o # Clock definitions obj-y += u8500_clk.o diff --git a/drivers/clk/ux500/clk-sysctrl.c b/drivers/clk/ux500/clk-sysctrl.c new file mode 100644 index 0000000..bc7e9bd --- /dev/null +++ b/drivers/clk/ux500/clk-sysctrl.c @@ -0,0 +1,221 @@ +/* + * Sysctrl clock implementation for ux500 platform. + * + * Copyright (C) 2013 ST-Ericsson SA + * Author: Ulf Hansson <ulf.hansson@linaro.org> + * + * License terms: GNU General Public License (GPL) version 2 + */ + +#include <linux/clk-provider.h> +#include <linux/mfd/abx500/ab8500-sysctrl.h> +#include <linux/device.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/err.h> +#include "clk.h" + +#define SYSCTRL_MAX_NUM_PARENTS 4 + +#define to_clk_sysctrl(_hw) container_of(_hw, struct clk_sysctrl, hw) + +struct clk_sysctrl { + struct clk_hw hw; + struct device *dev; + u8 parent_index; + u16 reg_sel[SYSCTRL_MAX_NUM_PARENTS]; + u8 reg_mask[SYSCTRL_MAX_NUM_PARENTS]; + u8 reg_bits[SYSCTRL_MAX_NUM_PARENTS]; + unsigned long rate; + unsigned long enable_delay_us; +}; + +/* Sysctrl clock operations. */ + +static int clk_sysctrl_prepare(struct clk_hw *hw) +{ + int ret; + struct clk_sysctrl *clk = to_clk_sysctrl(hw); + + ret = ab8500_sysctrl_write(clk->reg_sel[0], clk->reg_mask[0], + clk->reg_bits[0]); + + if (!ret && clk->enable_delay_us) + usleep_range(clk->enable_delay_us, clk->enable_delay_us); + + return ret; +} + +static void clk_sysctrl_unprepare(struct clk_hw *hw) +{ + struct clk_sysctrl *clk = to_clk_sysctrl(hw); + if (ab8500_sysctrl_clear(clk->reg_sel[0], clk->reg_mask[0])) + dev_err(clk->dev, "clk_sysctrl: %s fail to clear %s.\n", + __func__, __clk_get_name(hw->clk)); +} + +static unsigned long clk_sysctrl_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_sysctrl *clk = to_clk_sysctrl(hw); + return clk->rate; +} + +static int clk_sysctrl_set_parent(struct clk_hw *hw, u8 index) +{ + struct clk_sysctrl *clk = to_clk_sysctrl(hw); + u8 old_index = clk->parent_index; + int ret = 0; + + if (clk->reg_sel[old_index]) { + ret = ab8500_sysctrl_clear(clk->reg_sel[old_index], + clk->reg_mask[old_index]); + if (ret) + return ret; + } + + if (clk->reg_sel[index]) { + ret = ab8500_sysctrl_write(clk->reg_sel[index], + clk->reg_mask[index], + clk->reg_bits[index]); + if (ret) { + if (clk->reg_sel[old_index]) + ab8500_sysctrl_write(clk->reg_sel[old_index], + clk->reg_mask[old_index], + clk->reg_bits[old_index]); + return ret; + } + } + clk->parent_index = index; + + return ret; +} + +static u8 clk_sysctrl_get_parent(struct clk_hw *hw) +{ + struct clk_sysctrl *clk = to_clk_sysctrl(hw); + return clk->parent_index; +} + +static struct clk_ops clk_sysctrl_gate_ops = { + .prepare = clk_sysctrl_prepare, + .unprepare = clk_sysctrl_unprepare, +}; + +static struct clk_ops clk_sysctrl_gate_fixed_rate_ops = { + .prepare = clk_sysctrl_prepare, + .unprepare = clk_sysctrl_unprepare, + .recalc_rate = clk_sysctrl_recalc_rate, +}; + +static struct clk_ops clk_sysctrl_set_parent_ops = { + .set_parent = clk_sysctrl_set_parent, + .get_parent = clk_sysctrl_get_parent, +}; + +static struct clk *clk_reg_sysctrl(struct device *dev, + const char *name, + const char **parent_names, + u8 num_parents, + u16 *reg_sel, + u8 *reg_mask, + u8 *reg_bits, + unsigned long rate, + unsigned long enable_delay_us, + unsigned long flags, + struct clk_ops *clk_sysctrl_ops) +{ + struct clk_sysctrl *clk; + struct clk_init_data clk_sysctrl_init; + struct clk *clk_reg; + int i; + + if (!dev) + return ERR_PTR(-EINVAL); + + if (!name || (num_parents > SYSCTRL_MAX_NUM_PARENTS)) { + dev_err(dev, "clk_sysctrl: invalid arguments passed\n"); + return ERR_PTR(-EINVAL); + } + + clk = devm_kzalloc(dev, sizeof(struct clk_sysctrl), GFP_KERNEL); + if (!clk) { + dev_err(dev, "clk_sysctrl: could not allocate clk\n"); + return ERR_PTR(-ENOMEM); + } + + for (i = 0; i < num_parents; i++) { + clk->reg_sel[i] = reg_sel[i]; + clk->reg_bits[i] = reg_bits[i]; + clk->reg_mask[i] = reg_mask[i]; + } + + clk->parent_index = 0; + clk->rate = rate; + clk->enable_delay_us = enable_delay_us; + clk->dev = dev; + + clk_sysctrl_init.name = name; + clk_sysctrl_init.ops = clk_sysctrl_ops; + clk_sysctrl_init.flags = flags; + clk_sysctrl_init.parent_names = parent_names; + clk_sysctrl_init.num_parents = num_parents; + clk->hw.init = &clk_sysctrl_init; + + clk_reg = devm_clk_register(clk->dev, &clk->hw); + if (IS_ERR(clk_reg)) + dev_err(dev, "clk_sysctrl: clk_register failed\n"); + + return clk_reg; +} + +struct clk *clk_reg_sysctrl_gate(struct device *dev, + const char *name, + const char *parent_name, + u16 reg_sel, + u8 reg_mask, + u8 reg_bits, + unsigned long enable_delay_us, + unsigned long flags) +{ + const char **parent_names = (parent_name ? &parent_name : NULL); + u8 num_parents = (parent_name ? 1 : 0); + + return clk_reg_sysctrl(dev, name, parent_names, num_parents, + ®_sel, ®_mask, ®_bits, 0, enable_delay_us, + flags, &clk_sysctrl_gate_ops); +} + +struct clk *clk_reg_sysctrl_gate_fixed_rate(struct device *dev, + const char *name, + const char *parent_name, + u16 reg_sel, + u8 reg_mask, + u8 reg_bits, + unsigned long rate, + unsigned long enable_delay_us, + unsigned long flags) +{ + const char **parent_names = (parent_name ? &parent_name : NULL); + u8 num_parents = (parent_name ? 1 : 0); + + return clk_reg_sysctrl(dev, name, parent_names, num_parents, + ®_sel, ®_mask, ®_bits, + rate, enable_delay_us, flags, + &clk_sysctrl_gate_fixed_rate_ops); +} + +struct clk *clk_reg_sysctrl_set_parent(struct device *dev, + const char *name, + const char **parent_names, + u8 num_parents, + u16 *reg_sel, + u8 *reg_mask, + u8 *reg_bits, + unsigned long flags) +{ + return clk_reg_sysctrl(dev, name, parent_names, num_parents, + reg_sel, reg_mask, reg_bits, 0, 0, flags, + &clk_sysctrl_set_parent_ops); +} diff --git a/drivers/clk/ux500/clk.h b/drivers/clk/ux500/clk.h index c3e4491..3d2dfdc 100644 --- a/drivers/clk/ux500/clk.h +++ b/drivers/clk/ux500/clk.h @@ -11,6 +11,7 @@ #define __UX500_CLK_H #include <linux/clk.h> +#include <linux/device.h> struct clk *clk_reg_prcc_pclk(const char *name, const char *parent_name, @@ -57,4 +58,32 @@ struct clk *clk_reg_prcmu_opp_volt_scalable(const char *name, unsigned long rate, unsigned long flags); +struct clk *clk_reg_sysctrl_gate(struct device *dev, + const char *name, + const char *parent_name, + u16 reg_sel, + u8 reg_mask, + u8 reg_bits, + unsigned long enable_delay_us, + unsigned long flags); + +struct clk *clk_reg_sysctrl_gate_fixed_rate(struct device *dev, + const char *name, + const char *parent_name, + u16 reg_sel, + u8 reg_mask, + u8 reg_bits, + unsigned long rate, + unsigned long enable_delay_us, + unsigned long flags); + +struct clk *clk_reg_sysctrl_set_parent(struct device *dev, + const char *name, + const char **parent_names, + u8 num_parents, + u16 *reg_sel, + u8 *reg_mask, + u8 *reg_bits, + unsigned long flags); + #endif /* __UX500_CLK_H */ |