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// SPDX-License-Identifier: BSD-3-Clause
/*
* Clock drivers for Qualcomm APQ8096
*
* (C) Copyright 2017 Jorge Ramirez Ortiz <jorge.ramirez-ortiz@linaro.org>
*
* Based on Little Kernel driver, simplified
*/
#include <clk-uclass.h>
#include <dm.h>
#include <errno.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include <dt-bindings/clock/qcom,gcc-msm8996.h>
#include "clock-qcom.h"
/* Clocks: (from CLK_CTL_BASE) */
#define GPLL0_STATUS (0x0000)
#define APCS_GPLL_ENA_VOTE (0x52000)
#define APCS_CLOCK_BRANCH_ENA_VOTE (0x52004)
#define SDCC2_BCR (0x14000) /* block reset */
#define SDCC2_APPS_CBCR (0x14004) /* branch control */
#define SDCC2_AHB_CBCR (0x14008)
#define SDCC2_CMD_RCGR (0x14010)
#define BLSP2_AHB_CBCR (0x25004)
#define BLSP2_UART2_APPS_CBCR (0x29004)
#define BLSP2_UART2_APPS_CMD_RCGR (0x2900C)
/* GPLL0 clock control registers */
#define GPLL0_STATUS_ACTIVE BIT(30)
#define APCS_GPLL_ENA_VOTE_GPLL0 BIT(0)
static const struct pll_vote_clk gpll0_vote_clk = {
.status = GPLL0_STATUS,
.status_bit = GPLL0_STATUS_ACTIVE,
.ena_vote = APCS_GPLL_ENA_VOTE,
.vote_bit = APCS_GPLL_ENA_VOTE_GPLL0,
};
static struct vote_clk gcc_blsp2_ahb_clk = {
.cbcr_reg = BLSP2_AHB_CBCR,
.ena_vote = APCS_CLOCK_BRANCH_ENA_VOTE,
.vote_bit = BIT(15),
};
static int clk_init_sdc(struct msm_clk_priv *priv, uint rate)
{
int div = 5;
clk_enable_cbc(priv->base + SDCC2_AHB_CBCR);
clk_rcg_set_rate_mnd(priv->base, SDCC2_CMD_RCGR, div, 0, 0,
CFG_CLK_SRC_GPLL0, 8);
clk_enable_gpll0(priv->base, &gpll0_vote_clk);
clk_enable_cbc(priv->base + SDCC2_APPS_CBCR);
return rate;
}
static int clk_init_uart(struct msm_clk_priv *priv)
{
/* Enable AHB clock */
clk_enable_vote_clk(priv->base, &gcc_blsp2_ahb_clk);
/* 7372800 uart block clock @ GPLL0 */
clk_rcg_set_rate_mnd(priv->base, BLSP2_UART2_APPS_CMD_RCGR, 1, 192, 15625,
CFG_CLK_SRC_GPLL0, 16);
/* Vote for gpll0 clock */
clk_enable_gpll0(priv->base, &gpll0_vote_clk);
/* Enable core clk */
clk_enable_cbc(priv->base + BLSP2_UART2_APPS_CBCR);
return 0;
}
static ulong apq8096_clk_set_rate(struct clk *clk, ulong rate)
{
struct msm_clk_priv *priv = dev_get_priv(clk->dev);
switch (clk->id) {
case GCC_SDCC1_APPS_CLK: /* SDC1 */
return clk_init_sdc(priv, rate);
break;
case GCC_BLSP2_UART2_APPS_CLK: /*UART2*/
return clk_init_uart(priv);
default:
return 0;
}
}
static struct msm_clk_data apq8096_clk_data = {
.set_rate = apq8096_clk_set_rate,
};
static const struct udevice_id gcc_apq8096_of_match[] = {
{
.compatible = "qcom,gcc-msm8996",
.data = (ulong)&apq8096_clk_data,
},
{ }
};
U_BOOT_DRIVER(gcc_apq8096) = {
.name = "gcc_apq8096",
.id = UCLASS_NOP,
.of_match = gcc_apq8096_of_match,
.bind = qcom_cc_bind,
.flags = DM_FLAG_PRE_RELOC,
};
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