drivers/clk/sophgo/clk-cv18xx-common.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2023 Inochi Amaoto <inochiama@outlook.com>
   4  */
   5
   6 #include <linux/io.h>
   7 #include <linux/iopoll.h>
   8 #include <linux/spinlock.h>
   9 #include <linux/bug.h>
  10
  11 #include "clk-cv18xx-common.h"
  12
  13 int cv1800_clk_setbit(struct cv1800_clk_common *common,
  14                       struct cv1800_clk_regbit *field)
  15 {
  16         u32 mask = BIT(field->shift);
  17         u32 value;
  18         unsigned long flags;
  19
  20         spin_lock_irqsave(common->lock, flags);
  21
  22         value = readl(common->base + field->reg);
  23         writel(value | mask, common->base + field->reg);
  24
  25         spin_unlock_irqrestore(common->lock, flags);
  26
  27         return 0;
  28 }
  29
  30 int cv1800_clk_clearbit(struct cv1800_clk_common *common,
  31                         struct cv1800_clk_regbit *field)
  32 {
  33         u32 mask = BIT(field->shift);
  34         u32 value;
  35         unsigned long flags;
  36
  37         spin_lock_irqsave(common->lock, flags);
  38
  39         value = readl(common->base + field->reg);
  40         writel(value & ~mask, common->base + field->reg);
  41
  42         spin_unlock_irqrestore(common->lock, flags);
  43
  44         return 0;
  45 }
  46
  47 int cv1800_clk_checkbit(struct cv1800_clk_common *common,
  48                         struct cv1800_clk_regbit *field)
  49 {
  50         return readl(common->base + field->reg) & BIT(field->shift);
  51 }
  52
  53 #define PLL_LOCK_TIMEOUT_US     (200 * 1000)
  54
  55 void cv1800_clk_wait_for_lock(struct cv1800_clk_common *common,
  56                               u32 reg, u32 lock)
  57 {
  58         void __iomem *addr = common->base + reg;
  59         u32 regval;
  60
  61         if (!lock)
  62                 return;
  63
  64         WARN_ON(readl_relaxed_poll_timeout(addr, regval, regval & lock,
  65                                            100, PLL_LOCK_TIMEOUT_US));
  66 }