diff --git a/drivers/clk/mmp/Makefile b/drivers/clk/mmp/Makefile index 32b5b90c9fa9..2573d7c6198e 100644 --- a/drivers/clk/mmp/Makefile +++ b/drivers/clk/mmp/Makefile @@ -4,6 +4,8 @@ obj-y += clk-apbc.o clk-apmu.o clk-frac.o clk-mix.o clk-gate.o clk.o +obj-$(CONFIG_RESET_CONTROLLER) += reset.o + obj-$(CONFIG_CPU_PXA168) += clk-pxa168.o obj-$(CONFIG_CPU_PXA910) += clk-pxa910.o obj-$(CONFIG_CPU_MMP2) += clk-mmp2.o diff --git a/drivers/clk/mmp/reset.c b/drivers/clk/mmp/reset.c new file mode 100644 index 000000000000..b54da1fe73f0 --- /dev/null +++ b/drivers/clk/mmp/reset.c @@ -0,0 +1,99 @@ +#include +#include +#include +#include +#include + +#include "reset.h" + +#define rcdev_to_unit(rcdev) container_of(rcdev, struct mmp_clk_reset_unit, rcdev) + +static int mmp_of_reset_xlate(struct reset_controller_dev *rcdev, + const struct of_phandle_args *reset_spec) +{ + struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev); + struct mmp_clk_reset_cell *cell; + int i; + + if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells)) + return -EINVAL; + + for (i = 0; i < rcdev->nr_resets; i++) { + cell = &unit->cells[i]; + if (cell->clk_id == reset_spec->args[0]) + break; + } + + if (i == rcdev->nr_resets) + return -EINVAL; + + return i; +} + +static int mmp_clk_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev); + struct mmp_clk_reset_cell *cell; + unsigned long flags = 0; + u32 val; + + cell = &unit->cells[id]; + if (cell->lock) + spin_lock_irqsave(cell->lock, flags); + + val = readl(cell->reg); + val |= cell->bits; + writel(val, cell->reg); + + if (cell->lock) + spin_unlock_irqrestore(cell->lock, flags); + + return 0; +} + +static int mmp_clk_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev); + struct mmp_clk_reset_cell *cell; + unsigned long flags = 0; + u32 val; + + cell = &unit->cells[id]; + if (cell->lock) + spin_lock_irqsave(cell->lock, flags); + + val = readl(cell->reg); + val &= ~cell->bits; + writel(val, cell->reg); + + if (cell->lock) + spin_unlock_irqrestore(cell->lock, flags); + + return 0; +} + +static struct reset_control_ops mmp_clk_reset_ops = { + .assert = mmp_clk_reset_assert, + .deassert = mmp_clk_reset_deassert, +}; + +void mmp_clk_reset_register(struct device_node *np, + struct mmp_clk_reset_cell *cells, int nr_resets) +{ + struct mmp_clk_reset_unit *unit; + + unit = kzalloc(sizeof(*unit), GFP_KERNEL); + if (!unit) + return; + + unit->cells = cells; + unit->rcdev.of_reset_n_cells = 1; + unit->rcdev.nr_resets = nr_resets; + unit->rcdev.ops = &mmp_clk_reset_ops; + unit->rcdev.of_node = np; + unit->rcdev.of_xlate = mmp_of_reset_xlate; + + reset_controller_register(&unit->rcdev); +} diff --git a/drivers/clk/mmp/reset.h b/drivers/clk/mmp/reset.h new file mode 100644 index 000000000000..be8b1a7000f7 --- /dev/null +++ b/drivers/clk/mmp/reset.h @@ -0,0 +1,31 @@ +#ifndef __MACH_MMP_CLK_RESET_H +#define __MACH_MMP_CLK_RESET_H + +#include + +#define MMP_RESET_INVERT 1 + +struct mmp_clk_reset_cell { + unsigned int clk_id; + void __iomem *reg; + u32 bits; + unsigned int flags; + spinlock_t *lock; +}; + +struct mmp_clk_reset_unit { + struct reset_controller_dev rcdev; + struct mmp_clk_reset_cell *cells; +}; + +#ifdef CONFIG_RESET_CONTROLLER +void mmp_clk_reset_register(struct device_node *np, + struct mmp_clk_reset_cell *cells, int nr_resets); +#else +static inline void mmp_clk_reset_register(struct device_node *np, + struct mmp_clk_reset_cell *cells, int nr_resets) +{ +} +#endif + +#endif