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// SPDX-License-Identifier: BSD-3-Clause
/*
* Clock drivers for Qualcomm APQ8016
*
* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
*
* Based on Little Kernel driver, simplified
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <errno.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include <dt-bindings/clock/qcom,gcc-msm8916.h>
#include "clock-qcom.h"
/* Clocks: (from CLK_CTL_BASE) */
#define GPLL0_STATUS (0x2101C)
#define APCS_GPLL_ENA_VOTE (0x45000)
#define APCS_CLOCK_BRANCH_ENA_VOTE (0x45004)
#define SDCC_BCR(n) ((n * 0x1000) + 0x41000)
#define SDCC_CMD_RCGR(n) (((n + 1) * 0x1000) + 0x41004)
#define SDCC_APPS_CBCR(n) ((n * 0x1000) + 0x41018)
#define SDCC_AHB_CBCR(n) ((n * 0x1000) + 0x4101C)
/* BLSP1 AHB clock (root clock for BLSP) */
#define BLSP1_AHB_CBCR 0x1008
/* Uart clock control registers */
#define BLSP1_UART2_BCR (0x3028)
#define BLSP1_UART2_APPS_CBCR (0x302C)
#define BLSP1_UART2_APPS_CMD_RCGR (0x3034)
/* GPLL0 clock control registers */
#define GPLL0_STATUS_ACTIVE BIT(17)
static struct pll_vote_clk gpll0_vote_clk = {
.status = GPLL0_STATUS,
.status_bit = GPLL0_STATUS_ACTIVE,
.ena_vote = APCS_GPLL_ENA_VOTE,
.vote_bit = BIT(0),
};
static struct vote_clk gcc_blsp1_ahb_clk = {
.cbcr_reg = BLSP1_AHB_CBCR,
.ena_vote = APCS_CLOCK_BRANCH_ENA_VOTE,
.vote_bit = BIT(10),
};
/* SDHCI */
static int clk_init_sdc(struct msm_clk_priv *priv, int slot, uint rate)
{
int div = 15; /* 100MHz default */
if (rate == 200000000)
div = 4;
clk_enable_cbc(priv->base + SDCC_AHB_CBCR(slot));
/* 800Mhz/div, gpll0 */
clk_rcg_set_rate_mnd(priv->base, SDCC_CMD_RCGR(slot), div, 0, 0,
CFG_CLK_SRC_GPLL0, 8);
clk_enable_gpll0(priv->base, &gpll0_vote_clk);
clk_enable_cbc(priv->base + SDCC_APPS_CBCR(slot));
return rate;
}
/* UART: 115200 */
int apq8016_clk_init_uart(phys_addr_t base)
{
/* Enable AHB clock */
clk_enable_vote_clk(base, &gcc_blsp1_ahb_clk);
/* 7372800 uart block clock @ GPLL0 */
clk_rcg_set_rate_mnd(base, BLSP1_UART2_APPS_CMD_RCGR, 1, 144, 15625,
CFG_CLK_SRC_GPLL0, 16);
/* Vote for gpll0 clock */
clk_enable_gpll0(base, &gpll0_vote_clk);
/* Enable core clk */
clk_enable_cbc(base + BLSP1_UART2_APPS_CBCR);
return 0;
}
static ulong apq8016_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, 0, rate);
break;
case GCC_SDCC2_APPS_CLK: /* SDC2 */
return clk_init_sdc(priv, 1, rate);
break;
case GCC_BLSP1_UART2_APPS_CLK: /* UART2 */
return apq8016_clk_init_uart(priv->base);
break;
default:
return 0;
}
}
static struct msm_clk_data apq8016_clk_data = {
.set_rate = apq8016_clk_set_rate,
};
static const struct udevice_id gcc_apq8016_of_match[] = {
{
.compatible = "qcom,gcc-msm8916",
.data = (ulong)&apq8016_clk_data,
},
{ }
};
U_BOOT_DRIVER(gcc_apq8016) = {
.name = "gcc_apq8016",
.id = UCLASS_NOP,
.of_match = gcc_apq8016_of_match,
.bind = qcom_cc_bind,
.flags = DM_FLAG_PRE_RELOC,
};
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