diff options
Diffstat (limited to 'drivers/clk/ti/gate.c')
| -rw-r--r-- | drivers/clk/ti/gate.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/drivers/clk/ti/gate.c b/drivers/clk/ti/gate.c new file mode 100644 index 0000000000..8e477d50d0 --- /dev/null +++ b/drivers/clk/ti/gate.c @@ -0,0 +1,263 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * OMAP gate clock support + * + * Copyright (C) 2013 Texas Instruments, Inc. + * + * Tero Kristo <t-kristo@ti.com> + */ + +#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" + +#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, + .restore_context = clk_gate_restore_context, +}; + +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, + .restore_context = clk_gate_restore_context, +}; + +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, + .restore_context = clk_gate_restore_context, +}; + +/** + * omap36xx_gate_clk_enable_with_hsdiv_restore - enable clocks suffering + * from HSDivider PWRDN problem Implements Errata ID: i556. + * @hw: DPLL output struct clk_hw + * + * 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 *hw) +{ + struct clk_omap_divider *parent; + struct clk_hw *parent_hw; + u32 dummy_v, orig_v; + int ret; + + /* Clear PWRDN bit of HSDIVIDER */ + ret = omap2_dflt_clk_enable(hw); + + /* Parent is the x2 node, get parent of parent for the m2 div */ + parent_hw = clk_hw_get_parent(clk_hw_get_parent(hw)); + parent = to_clk_omap_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_node *node, const char *name, + const char *parent_name, unsigned long flags, + struct clk_omap_reg *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; + + memcpy(&clk_hw->enable_reg, reg, sizeof(*reg)); + clk_hw->enable_bit = bit_idx; + clk_hw->ops = hw_ops; + + clk_hw->flags = clk_gate_flags; + + init.parent_names = &parent_name; + init.num_parents = 1; + + init.flags = flags; + + clk = of_ti_clk_register_omap_hw(node, &clk_hw->hw, name); + + if (IS_ERR(clk)) + kfree(clk_hw); + + return clk; +} + +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; + struct clk_omap_reg reg; + const char *name; + u8 enable_bit = 0; + u32 val; + u32 flags = 0; + u8 clk_gate_flags = 0; + + if (ops != &omap_gate_clkdm_clk_ops) { + if (ti_clk_get_reg_addr(node, 0, ®)) + return; + + if (!of_property_read_u32(node, "ti,bit-shift", &val)) + enable_bit = val; + } + + if (of_clk_get_parent_count(node) != 1) { + pr_err("%pOFn must have 1 parent\n", node); + 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; + + name = ti_dt_clk_name(node); + clk = _register_gate(node, name, parent_name, flags, ®, + 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; + + if (ti_clk_get_reg_addr(node, 0, &gate->enable_reg)) + goto cleanup; + + of_property_read_u32(node, "ti,bit-shift", &val); + + gate->enable_bit = val; + gate->ops = hw_ops; + + 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 |