git.sur5r.net Git - u-boot/blob - drivers/clk/at91/clk-peripheral.c

   1 /*
   2  * Copyright (C) 2016 Atmel Corporation
   3  *               Wenyou.Yang <wenyou.yang@atmel.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <clk-uclass.h>
  10 #include <dm/device.h>
  11 #include <linux/io.h>
  12 #include <mach/at91_pmc.h>
  13 #include "pmc.h"
  14
  15 #define PERIPHERAL_ID_MIN       2
  16 #define PERIPHERAL_ID_MAX       31
  17 #define PERIPHERAL_MASK(id)     (1 << ((id) & PERIPHERAL_ID_MAX))
  18
  19 static int sam9x5_periph_clk_enable(struct clk *clk)
  20 {
  21         struct pmc_platdata *plat = dev_get_platdata(clk->dev);
  22         struct at91_pmc *pmc = plat->reg_base;
  23
  24         if (clk->id < PERIPHERAL_ID_MIN)
  25                 return -1;
  26
  27         writel(clk->id & AT91_PMC_PCR_PID_MASK, &pmc->pcr);
  28         setbits_le32(&pmc->pcr, AT91_PMC_PCR_CMD_WRITE | AT91_PMC_PCR_EN);
  29
  30         return 0;
  31 }
  32
  33 static struct clk_ops sam9x5_periph_clk_ops = {
  34         .enable = sam9x5_periph_clk_enable,
  35 };
  36
  37 static int sam9x5_periph_clk_bind(struct udevice *dev)
  38 {
  39         return at91_pmc_clk_node_bind(dev);
  40 }
  41
  42 static int sam9x5_periph_clk_probe(struct udevice *dev)
  43 {
  44         return at91_pmc_core_probe(dev);
  45 }
  46
  47 static const struct udevice_id sam9x5_periph_clk_match[] = {
  48         { .compatible = "atmel,at91sam9x5-clk-peripheral" },
  49         {}
  50 };
  51
  52 U_BOOT_DRIVER(sam9x5_periph_clk) = {
  53         .name = "sam9x5-periph-clk",
  54         .id = UCLASS_CLK,
  55         .of_match = sam9x5_periph_clk_match,
  56         .bind = sam9x5_periph_clk_bind,
  57         .probe = sam9x5_periph_clk_probe,
  58         .platdata_auto_alloc_size = sizeof(struct pmc_platdata),
  59         .ops = &sam9x5_periph_clk_ops,
  60 };