diff options
Diffstat (limited to 'kernel/drivers/clk/ti/gate.c')
| -rw-r--r-- | kernel/drivers/clk/ti/gate.c | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/kernel/drivers/clk/ti/gate.c b/kernel/drivers/clk/ti/gate.c new file mode 100644 index 000000000..0c6fdfcd5 --- /dev/null +++ b/kernel/drivers/clk/ti/gate.c @@ -0,0 +1,352 @@ +/* + * OMAP gate clock support + * + * Copyright (C) 2013 Texas Instruments, Inc. + * + * Tero Kristo <t-kristo@ti.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 program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; 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/slab.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/clk/ti.h> + +#include "clock.h" + +#define to_clk_divider(_hw) container_of(_hw, struct clk_divider, hw) + +#undef pr_fmt +#define pr_fmt(fmt) "%s: " fmt, __func__ + +static int omap36xx_gate_clk_enable_with_hsdiv_restore(struct clk_hw *clk); + +static const struct clk_ops omap_gate_clkdm_clk_ops = { + .init = &omap2_init_clk_clkdm, + .enable = &omap2_clkops_enable_clkdm, + .disable = &omap2_clkops_disable_clkdm, +}; + +static const struct clk_ops omap_gate_clk_ops = { + .init = &omap2_init_clk_clkdm, + .enable = &omap2_dflt_clk_enable, + .disable = &omap2_dflt_clk_disable, + .is_enabled = &omap2_dflt_clk_is_enabled, +}; + +static const struct clk_ops omap_gate_clk_hsdiv_restore_ops = { + .init = &omap2_init_clk_clkdm, + .enable = &omap36xx_gate_clk_enable_with_hsdiv_restore, + .disable = &omap2_dflt_clk_disable, + .is_enabled = &omap2_dflt_clk_is_enabled, +}; + +/** + * omap36xx_gate_clk_enable_with_hsdiv_restore - enable clocks suffering + * from HSDivider PWRDN problem Implements Errata ID: i556. + * @clk: DPLL output struct clk + * + * 3630 only: dpll3_m3_ck, dpll4_m2_ck, dpll4_m3_ck, dpll4_m4_ck, + * dpll4_m5_ck & dpll4_m6_ck dividers gets loaded with reset + * valueafter their respective PWRDN bits are set. Any dummy write + * (Any other value different from the Read value) to the + * corresponding CM_CLKSEL register will refresh the dividers. + */ +static int omap36xx_gate_clk_enable_with_hsdiv_restore(struct clk_hw *clk) +{ + struct clk_divider *parent; + struct clk_hw *parent_hw; + u32 dummy_v, orig_v; + int ret; + + /* Clear PWRDN bit of HSDIVIDER */ + ret = omap2_dflt_clk_enable(clk); + + /* Parent is the x2 node, get parent of parent for the m2 div */ + parent_hw = __clk_get_hw(__clk_get_parent(__clk_get_parent(clk->clk))); + parent = to_clk_divider(parent_hw); + + /* Restore the dividers */ + if (!ret) { + orig_v = ti_clk_ll_ops->clk_readl(parent->reg); + dummy_v = orig_v; + + /* Write any other value different from the Read value */ + dummy_v ^= (1 << parent->shift); + ti_clk_ll_ops->clk_writel(dummy_v, parent->reg); + + /* Write the original divider */ + ti_clk_ll_ops->clk_writel(orig_v, parent->reg); + } + + return ret; +} + +static struct clk *_register_gate(struct device *dev, const char *name, + const char *parent_name, unsigned long flags, + void __iomem *reg, u8 bit_idx, + u8 clk_gate_flags, const struct clk_ops *ops, + const struct clk_hw_omap_ops *hw_ops) +{ + struct clk_init_data init = { NULL }; + struct clk_hw_omap *clk_hw; + struct clk *clk; + + clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL); + if (!clk_hw) + return ERR_PTR(-ENOMEM); + + clk_hw->hw.init = &init; + + init.name = name; + init.ops = ops; + + clk_hw->enable_reg = reg; + clk_hw->enable_bit = bit_idx; + clk_hw->ops = hw_ops; + + clk_hw->flags = MEMMAP_ADDRESSING | clk_gate_flags; + + init.parent_names = &parent_name; + init.num_parents = 1; + + init.flags = flags; + + clk = clk_register(NULL, &clk_hw->hw); + + if (IS_ERR(clk)) + kfree(clk_hw); + + return clk; +} + +#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_ATAGS) +struct clk *ti_clk_register_gate(struct ti_clk *setup) +{ + const struct clk_ops *ops = &omap_gate_clk_ops; + const struct clk_hw_omap_ops *hw_ops = NULL; + u32 reg; + struct clk_omap_reg *reg_setup; + u32 flags = 0; + u8 clk_gate_flags = 0; + struct ti_clk_gate *gate; + + gate = setup->data; + + if (gate->flags & CLKF_INTERFACE) + return ti_clk_register_interface(setup); + + reg_setup = (struct clk_omap_reg *)® + + if (gate->flags & CLKF_SET_RATE_PARENT) + flags |= CLK_SET_RATE_PARENT; + + if (gate->flags & CLKF_SET_BIT_TO_DISABLE) + clk_gate_flags |= INVERT_ENABLE; + + if (gate->flags & CLKF_HSDIV) { + ops = &omap_gate_clk_hsdiv_restore_ops; + hw_ops = &clkhwops_wait; + } + + if (gate->flags & CLKF_DSS) + hw_ops = &clkhwops_omap3430es2_dss_usbhost_wait; + + if (gate->flags & CLKF_WAIT) + hw_ops = &clkhwops_wait; + + if (gate->flags & CLKF_CLKDM) + ops = &omap_gate_clkdm_clk_ops; + + if (gate->flags & CLKF_AM35XX) + hw_ops = &clkhwops_am35xx_ipss_module_wait; + + reg_setup->index = gate->module; + reg_setup->offset = gate->reg; + + return _register_gate(NULL, setup->name, gate->parent, flags, + (void __iomem *)reg, gate->bit_shift, + clk_gate_flags, ops, hw_ops); +} + +struct clk_hw *ti_clk_build_component_gate(struct ti_clk_gate *setup) +{ + struct clk_hw_omap *gate; + struct clk_omap_reg *reg; + const struct clk_hw_omap_ops *ops = &clkhwops_wait; + + if (!setup) + return NULL; + + gate = kzalloc(sizeof(*gate), GFP_KERNEL); + if (!gate) + return ERR_PTR(-ENOMEM); + + reg = (struct clk_omap_reg *)&gate->enable_reg; + reg->index = setup->module; + reg->offset = setup->reg; + + gate->enable_bit = setup->bit_shift; + + if (setup->flags & CLKF_NO_WAIT) + ops = NULL; + + if (setup->flags & CLKF_INTERFACE) + ops = &clkhwops_iclk_wait; + + gate->ops = ops; + gate->flags = MEMMAP_ADDRESSING; + + return &gate->hw; +} +#endif + +static void __init _of_ti_gate_clk_setup(struct device_node *node, + const struct clk_ops *ops, + const struct clk_hw_omap_ops *hw_ops) +{ + struct clk *clk; + const char *parent_name; + void __iomem *reg = NULL; + u8 enable_bit = 0; + u32 val; + u32 flags = 0; + u8 clk_gate_flags = 0; + + if (ops != &omap_gate_clkdm_clk_ops) { + reg = ti_clk_get_reg_addr(node, 0); + if (IS_ERR(reg)) + return; + + if (!of_property_read_u32(node, "ti,bit-shift", &val)) + enable_bit = val; + } + + if (of_clk_get_parent_count(node) != 1) { + pr_err("%s must have 1 parent\n", node->name); + return; + } + + parent_name = of_clk_get_parent_name(node, 0); + + if (of_property_read_bool(node, "ti,set-rate-parent")) + flags |= CLK_SET_RATE_PARENT; + + if (of_property_read_bool(node, "ti,set-bit-to-disable")) + clk_gate_flags |= INVERT_ENABLE; + + clk = _register_gate(NULL, node->name, parent_name, flags, reg, + enable_bit, clk_gate_flags, ops, hw_ops); + + if (!IS_ERR(clk)) + of_clk_add_provider(node, of_clk_src_simple_get, clk); +} + +static void __init +_of_ti_composite_gate_clk_setup(struct device_node *node, + const struct clk_hw_omap_ops *hw_ops) +{ + struct clk_hw_omap *gate; + u32 val = 0; + + gate = kzalloc(sizeof(*gate), GFP_KERNEL); + if (!gate) + return; + + gate->enable_reg = ti_clk_get_reg_addr(node, 0); + if (IS_ERR(gate->enable_reg)) + goto cleanup; + + of_property_read_u32(node, "ti,bit-shift", &val); + + gate->enable_bit = val; + gate->ops = hw_ops; + gate->flags = MEMMAP_ADDRESSING; + + if (!ti_clk_add_component(node, &gate->hw, CLK_COMPONENT_TYPE_GATE)) + return; + +cleanup: + kfree(gate); +} + +static void __init +of_ti_composite_no_wait_gate_clk_setup(struct device_node *node) +{ + _of_ti_composite_gate_clk_setup(node, NULL); +} +CLK_OF_DECLARE(ti_composite_no_wait_gate_clk, "ti,composite-no-wait-gate-clock", + of_ti_composite_no_wait_gate_clk_setup); + +#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) +static void __init of_ti_composite_interface_clk_setup(struct device_node *node) +{ + _of_ti_composite_gate_clk_setup(node, &clkhwops_iclk_wait); +} +CLK_OF_DECLARE(ti_composite_interface_clk, "ti,composite-interface-clock", + of_ti_composite_interface_clk_setup); +#endif + +static void __init of_ti_composite_gate_clk_setup(struct device_node *node) +{ + _of_ti_composite_gate_clk_setup(node, &clkhwops_wait); +} +CLK_OF_DECLARE(ti_composite_gate_clk, "ti,composite-gate-clock", + of_ti_composite_gate_clk_setup); + + +static void __init of_ti_clkdm_gate_clk_setup(struct device_node *node) +{ + _of_ti_gate_clk_setup(node, &omap_gate_clkdm_clk_ops, NULL); +} +CLK_OF_DECLARE(ti_clkdm_gate_clk, "ti,clkdm-gate-clock", + of_ti_clkdm_gate_clk_setup); + +static void __init of_ti_hsdiv_gate_clk_setup(struct device_node *node) +{ + _of_ti_gate_clk_setup(node, &omap_gate_clk_hsdiv_restore_ops, + &clkhwops_wait); +} +CLK_OF_DECLARE(ti_hsdiv_gate_clk, "ti,hsdiv-gate-clock", + of_ti_hsdiv_gate_clk_setup); + +static void __init of_ti_gate_clk_setup(struct device_node *node) +{ + _of_ti_gate_clk_setup(node, &omap_gate_clk_ops, NULL); +} +CLK_OF_DECLARE(ti_gate_clk, "ti,gate-clock", of_ti_gate_clk_setup); + +static void __init of_ti_wait_gate_clk_setup(struct device_node *node) +{ + _of_ti_gate_clk_setup(node, &omap_gate_clk_ops, &clkhwops_wait); +} +CLK_OF_DECLARE(ti_wait_gate_clk, "ti,wait-gate-clock", + of_ti_wait_gate_clk_setup); + +#ifdef CONFIG_ARCH_OMAP3 +static void __init of_ti_am35xx_gate_clk_setup(struct device_node *node) +{ + _of_ti_gate_clk_setup(node, &omap_gate_clk_ops, + &clkhwops_am35xx_ipss_module_wait); +} +CLK_OF_DECLARE(ti_am35xx_gate_clk, "ti,am35xx-gate-clock", + of_ti_am35xx_gate_clk_setup); + +static void __init of_ti_dss_gate_clk_setup(struct device_node *node) +{ + _of_ti_gate_clk_setup(node, &omap_gate_clk_ops, + &clkhwops_omap3430es2_dss_usbhost_wait); +} +CLK_OF_DECLARE(ti_dss_gate_clk, "ti,dss-gate-clock", + of_ti_dss_gate_clk_setup); +#endif |