diff options
| author | Rahul Tanwar <rtanwar@maxlinear.com> | 2022-10-13 14:48:30 +0800 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2022-10-17 14:17:37 -0700 |
| commit | 036177310bac5534de44ff6a7b60a4d2c0b6567c (patch) | |
| tree | 88d7f7c9efc47a6c0001dddb4e28597c39adb7ad /drivers/clk/x86/clk-cgu.h | |
| parent | 9abf2313adc1ca1b6180c508c25f22f9395cc780 (diff) | |
clk: mxl: Switch from direct readl/writel based IO to regmap based IO
Earlier version of driver used direct io remapped register read
writes using readl/writel. But we need secure boot access which
is only possible when registers are read & written using regmap.
This is because the security bus/hook is written & coupled only
with regmap layer.
Switch the driver from direct readl/writel based register accesses
to regmap based register accesses.
Additionally, update the license headers to latest status.
Reviewed-by: Yi xin Zhu <yzhu@maxlinear.com>
Signed-off-by: Rahul Tanwar <rtanwar@maxlinear.com>
Link: https://lore.kernel.org/r/2610331918206e0e3bd18babb39393a558fb34f9.1665642720.git.rtanwar@maxlinear.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/x86/clk-cgu.h')
| -rw-r--r-- | drivers/clk/x86/clk-cgu.h | 38 |
1 files changed, 21 insertions, 17 deletions
diff --git a/drivers/clk/x86/clk-cgu.h b/drivers/clk/x86/clk-cgu.h index 4e22bfb22312..dbcb66468797 100644 --- a/drivers/clk/x86/clk-cgu.h +++ b/drivers/clk/x86/clk-cgu.h @@ -1,18 +1,19 @@ /* SPDX-License-Identifier: GPL-2.0 */ /* - * Copyright(c) 2020 Intel Corporation. - * Zhu YiXin <yixin.zhu@intel.com> - * Rahul Tanwar <rahul.tanwar@intel.com> + * Copyright (C) 2020-2022 MaxLinear, Inc. + * Copyright (C) 2020 Intel Corporation. + * Zhu Yixin <yzhu@maxlinear.com> + * Rahul Tanwar <rtanwar@maxlinear.com> */ #ifndef __CLK_CGU_H #define __CLK_CGU_H -#include <linux/io.h> +#include <linux/regmap.h> struct lgm_clk_mux { struct clk_hw hw; - void __iomem *membase; + struct regmap *membase; unsigned int reg; u8 shift; u8 width; @@ -22,7 +23,7 @@ struct lgm_clk_mux { struct lgm_clk_divider { struct clk_hw hw; - void __iomem *membase; + struct regmap *membase; unsigned int reg; u8 shift; u8 width; @@ -35,7 +36,7 @@ struct lgm_clk_divider { struct lgm_clk_ddiv { struct clk_hw hw; - void __iomem *membase; + struct regmap *membase; unsigned int reg; u8 shift0; u8 width0; @@ -53,7 +54,7 @@ struct lgm_clk_ddiv { struct lgm_clk_gate { struct clk_hw hw; - void __iomem *membase; + struct regmap *membase; unsigned int reg; u8 shift; unsigned long flags; @@ -77,7 +78,7 @@ enum lgm_clk_type { * @clk_data: array of hw clocks and clk number. */ struct lgm_clk_provider { - void __iomem *membase; + struct regmap *membase; struct device_node *np; struct device *dev; struct clk_hw_onecell_data clk_data; @@ -92,7 +93,7 @@ enum pll_type { struct lgm_clk_pll { struct clk_hw hw; - void __iomem *membase; + struct regmap *membase; unsigned int reg; unsigned long flags; enum pll_type type; @@ -300,29 +301,32 @@ struct lgm_clk_branch { .div = _d, \ } -static inline void lgm_set_clk_val(void __iomem *membase, u32 reg, +static inline void lgm_set_clk_val(struct regmap *membase, u32 reg, u8 shift, u8 width, u32 set_val) { u32 mask = (GENMASK(width - 1, 0) << shift); - u32 regval; - regval = readl(membase + reg); - regval = (regval & ~mask) | ((set_val << shift) & mask); - writel(regval, membase + reg); + regmap_update_bits(membase, reg, mask, set_val << shift); } -static inline u32 lgm_get_clk_val(void __iomem *membase, u32 reg, +static inline u32 lgm_get_clk_val(struct regmap *membase, u32 reg, u8 shift, u8 width) { u32 mask = (GENMASK(width - 1, 0) << shift); u32 val; - val = readl(membase + reg); + if (regmap_read(membase, reg, &val)) { + WARN_ONCE(1, "Failed to read clk reg: 0x%x\n", reg); + return 0; + } + val = (val & mask) >> shift; return val; } + + int lgm_clk_register_branches(struct lgm_clk_provider *ctx, const struct lgm_clk_branch *list, unsigned int nr_clk); |