mirror of
https://github.com/AsahiLinux/u-boot
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148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
// SPDX-License-Identifier: BSD-3-Clause
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/*
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* Clock drivers for Qualcomm APQ8016, APQ8096
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*
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* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
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*
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* Based on Little Kernel driver, simplified
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*/
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#include <common.h>
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#include <clk-uclass.h>
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#include <dm.h>
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#include <errno.h>
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#include <asm/io.h>
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#include <linux/bitops.h>
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#include "clock-snapdragon.h"
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/* CBCR register fields */
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#define CBCR_BRANCH_ENABLE_BIT BIT(0)
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#define CBCR_BRANCH_OFF_BIT BIT(31)
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extern ulong msm_set_rate(struct clk *clk, ulong rate);
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/* Enable clock controlled by CBC soft macro */
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void clk_enable_cbc(phys_addr_t cbcr)
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{
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setbits_le32(cbcr, CBCR_BRANCH_ENABLE_BIT);
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while (readl(cbcr) & CBCR_BRANCH_OFF_BIT)
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;
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}
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void clk_enable_gpll0(phys_addr_t base, const struct pll_vote_clk *gpll0)
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{
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if (readl(base + gpll0->status) & gpll0->status_bit)
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return; /* clock already enabled */
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setbits_le32(base + gpll0->ena_vote, gpll0->vote_bit);
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while ((readl(base + gpll0->status) & gpll0->status_bit) == 0)
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;
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}
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#define BRANCH_ON_VAL (0)
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#define BRANCH_NOC_FSM_ON_VAL BIT(29)
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#define BRANCH_CHECK_MASK GENMASK(31, 28)
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void clk_enable_vote_clk(phys_addr_t base, const struct vote_clk *vclk)
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{
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u32 val;
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setbits_le32(base + vclk->ena_vote, vclk->vote_bit);
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do {
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val = readl(base + vclk->cbcr_reg);
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val &= BRANCH_CHECK_MASK;
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} while ((val != BRANCH_ON_VAL) && (val != BRANCH_NOC_FSM_ON_VAL));
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}
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#define APPS_CMD_RCGR_UPDATE BIT(0)
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/* Update clock command via CMD_RCGR */
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void clk_bcr_update(phys_addr_t apps_cmd_rcgr)
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{
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setbits_le32(apps_cmd_rcgr, APPS_CMD_RCGR_UPDATE);
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/* Wait for frequency to be updated. */
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while (readl(apps_cmd_rcgr) & APPS_CMD_RCGR_UPDATE)
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;
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}
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#define CFG_MODE_DUAL_EDGE (0x2 << 12) /* Counter mode */
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#define CFG_MASK 0x3FFF
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#define CFG_DIVIDER_MASK 0x1F
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/* root set rate for clocks with half integer and MND divider */
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void clk_rcg_set_rate_mnd(phys_addr_t base, const struct bcr_regs *regs,
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int div, int m, int n, int source)
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{
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u32 cfg;
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/* M value for MND divider. */
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u32 m_val = m;
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/* NOT(N-M) value for MND divider. */
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u32 n_val = ~((n) - (m)) * !!(n);
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/* NOT 2D value for MND divider. */
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u32 d_val = ~(n);
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/* Program MND values */
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writel(m_val, base + regs->M);
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writel(n_val, base + regs->N);
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writel(d_val, base + regs->D);
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/* setup src select and divider */
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cfg = readl(base + regs->cfg_rcgr);
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cfg &= ~CFG_MASK;
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cfg |= source & CFG_CLK_SRC_MASK; /* Select clock source */
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/* Set the divider; HW permits fraction dividers (+0.5), but
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for simplicity, we will support integers only */
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if (div)
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cfg |= (2 * div - 1) & CFG_DIVIDER_MASK;
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if (n_val)
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cfg |= CFG_MODE_DUAL_EDGE;
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writel(cfg, base + regs->cfg_rcgr); /* Write new clock configuration */
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/* Inform h/w to start using the new config. */
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clk_bcr_update(base + regs->cmd_rcgr);
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}
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static int msm_clk_probe(struct udevice *dev)
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{
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struct msm_clk_priv *priv = dev_get_priv(dev);
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priv->base = dev_read_addr(dev);
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if (priv->base == FDT_ADDR_T_NONE)
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return -EINVAL;
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return 0;
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}
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static ulong msm_clk_set_rate(struct clk *clk, ulong rate)
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{
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return msm_set_rate(clk, rate);
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}
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static struct clk_ops msm_clk_ops = {
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.set_rate = msm_clk_set_rate,
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};
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static const struct udevice_id msm_clk_ids[] = {
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{ .compatible = "qcom,gcc-msm8916" },
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{ .compatible = "qcom,gcc-apq8016" },
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{ .compatible = "qcom,gcc-msm8996" },
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{ .compatible = "qcom,gcc-apq8096" },
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{ }
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};
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U_BOOT_DRIVER(clk_msm) = {
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.name = "clk_msm",
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.id = UCLASS_CLK,
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.of_match = msm_clk_ids,
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.ops = &msm_clk_ops,
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.priv_auto = sizeof(struct msm_clk_priv),
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.probe = msm_clk_probe,
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};
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