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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
149 lines
3.5 KiB
C
149 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_RGCR_UPDATE BIT(0)
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/* Update clock command via CMD_RGCR */
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void clk_bcr_update(phys_addr_t apps_cmd_rgcr)
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{
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setbits_le32(apps_cmd_rgcr, APPS_CMD_RGCR_UPDATE);
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/* Wait for frequency to be updated. */
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while (readl(apps_cmd_rgcr) & APPS_CMD_RGCR_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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