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/*
* Clock drivers for Qualcomm APQ8016
*
* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
*
* Based on Little Kernel driver, simplified
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <errno.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include "clock-snapdragon.h"
/* GPLL0 clock control registers */
#define GPLL0_STATUS_ACTIVE BIT(17)
#define APCS_GPLL_ENA_VOTE_GPLL0 BIT(0)
static const struct bcr_regs sdc_regs[] = {
{
.cfg_rcgr = SDCC_CFG_RCGR(1),
.cmd_rcgr = SDCC_CMD_RCGR(1),
.M = SDCC_M(1),
.N = SDCC_N(1),
.D = SDCC_D(1),
},
{
.cfg_rcgr = SDCC_CFG_RCGR(2),
.cmd_rcgr = SDCC_CMD_RCGR(2),
.M = SDCC_M(2),
.N = SDCC_N(2),
.D = SDCC_D(2),
}
};
static struct gpll0_ctrl gpll0_ctrl = {
.status = GPLL0_STATUS,
.status_bit = GPLL0_STATUS_ACTIVE,
.ena_vote = APCS_GPLL_ENA_VOTE,
.vote_bit = APCS_GPLL_ENA_VOTE_GPLL0,
};
/* SDHCI */
static int clk_init_sdc(struct msm_clk_priv *priv, int slot, uint rate)
{
int div = 8; /* 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, &sdc_regs[slot], div, 0, 0,
CFG_CLK_SRC_GPLL0);
clk_enable_gpll0(priv->base, &gpll0_ctrl);
clk_enable_cbc(priv->base + SDCC_APPS_CBCR(slot));
return rate;
}
static const struct bcr_regs uart2_regs = {
.cfg_rcgr = BLSP1_UART2_APPS_CFG_RCGR,
.cmd_rcgr = BLSP1_UART2_APPS_CMD_RCGR,
.M = BLSP1_UART2_APPS_M,
.N = BLSP1_UART2_APPS_N,
.D = BLSP1_UART2_APPS_D,
};
/* UART: 115200 */
static int clk_init_uart(struct msm_clk_priv *priv)
{
/* Enable iface clk */
clk_enable_cbc(priv->base + BLSP1_AHB_CBCR);
/* 7372800 uart block clock @ GPLL0 */
clk_rcg_set_rate_mnd(priv->base, &uart2_regs, 1, 144, 15625,
CFG_CLK_SRC_GPLL0);
clk_enable_gpll0(priv->base, &gpll0_ctrl);
/* Enable core clk */
clk_enable_cbc(priv->base + BLSP1_UART2_APPS_CBCR);
return 0;
}
ulong msm_set_rate(struct clk *clk, ulong rate)
{
struct msm_clk_priv *priv = dev_get_priv(clk->dev);
switch (clk->id) {
case 0: /* SDC1 */
return clk_init_sdc(priv, 0, rate);
break;
case 1: /* SDC2 */
return clk_init_sdc(priv, 1, rate);
break;
case 4: /* UART2 */
return clk_init_uart(priv);
break;
default:
return 0;
}
}
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