arch/arm/mach-snapdragon/clock-apq8096.c

   1 /*
   2  * Clock drivers for Qualcomm APQ8096
   3  *
   4  * (C) Copyright 2017 Jorge Ramirez Ortiz <jorge.ramirez-ortiz@linaro.org>
   5  *
   6  * Based on Little Kernel driver, simplified
   7  *
   8  * SPDX-License-Identifier:     BSD-3-Clause
   9  */
  10
  11 #include <common.h>
  12 #include <clk-uclass.h>
  13 #include <dm.h>
  14 #include <errno.h>
  15 #include <asm/io.h>
  16 #include <linux/bitops.h>
  17 #include "clock-snapdragon.h"
  18
  19 /* GPLL0 clock control registers */
  20 #define GPLL0_STATUS_ACTIVE             BIT(30)
  21 #define APCS_GPLL_ENA_VOTE_GPLL0        BIT(0)
  22
  23 static const struct bcr_regs sdc_regs = {
  24         .cfg_rcgr = SDCC2_CFG_RCGR,
  25         .cmd_rcgr = SDCC2_CMD_RCGR,
  26         .M = SDCC2_M,
  27         .N = SDCC2_N,
  28         .D = SDCC2_D,
  29 };
  30
  31 static const struct gpll0_ctrl gpll0_ctrl = {
  32         .status = GPLL0_STATUS,
  33         .status_bit = GPLL0_STATUS_ACTIVE,
  34         .ena_vote = APCS_GPLL_ENA_VOTE,
  35         .vote_bit = APCS_GPLL_ENA_VOTE_GPLL0,
  36 };
  37
  38 static int clk_init_sdc(struct msm_clk_priv *priv, uint rate)
  39 {
  40         int div = 3;
  41
  42         clk_enable_cbc(priv->base + SDCC2_AHB_CBCR);
  43         clk_rcg_set_rate_mnd(priv->base, &sdc_regs, div, 0, 0,
  44                              CFG_CLK_SRC_GPLL0);
  45         clk_enable_gpll0(priv->base, &gpll0_ctrl);
  46         clk_enable_cbc(priv->base + SDCC2_APPS_CBCR);
  47
  48         return rate;
  49 }
  50
  51 ulong msm_set_rate(struct clk *clk, ulong rate)
  52 {
  53         struct msm_clk_priv *priv = dev_get_priv(clk->dev);
  54
  55         switch (clk->id) {
  56         case 0: /* SDC1 */
  57                 return clk_init_sdc(priv, rate);
  58                 break;
  59         default:
  60                 return 0;
  61         }
  62 }