mirror of
https://github.com/brain-hackers/u-boot-brain
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8729b1ae2c
At present these functions return 0 on success. For some devices we want to know how many bytes were transferred. It seems useful to adjust the API to be more like the POSIX read() and write() functions. Update these two methods, a test and all users. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrick Delaunay <patrick.delaunay@st.com>
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018 Arm Ltd
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* Author: Liviu Dudau <liviu.dudau@foss.arm.com>
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*
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*/
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#define DEBUG
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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 <dm/lists.h>
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#include <errno.h>
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#include <misc.h>
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#define CLK_FUNCTION BIT(20)
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struct vexpress_osc_clk_priv {
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u8 osc;
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ulong rate_min;
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ulong rate_max;
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};
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static ulong vexpress_osc_clk_get_rate(struct clk *clk)
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{
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int err;
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u32 data;
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struct udevice *vexpress_cfg = dev_get_parent(clk->dev);
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struct vexpress_osc_clk_priv *priv = dev_get_priv(clk->dev);
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data = CLK_FUNCTION | priv->osc;
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err = misc_read(vexpress_cfg, 0, &data, sizeof(data));
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if (err < 0)
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return err;
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return data;
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}
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#ifndef CONFIG_SPL_BUILD
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static ulong vexpress_osc_clk_set_rate(struct clk *clk, ulong rate)
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{
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int err;
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u32 buffer[2];
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struct udevice *vexpress_cfg = dev_get_parent(clk->dev);
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struct vexpress_osc_clk_priv *priv = dev_get_priv(clk->dev);
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if (rate < priv->rate_min || rate > priv->rate_max)
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return -EINVAL;
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/*
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* we are sending the parent the info about the oscillator
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* and the value we want to set
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*/
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buffer[0] = CLK_FUNCTION | priv->osc;
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buffer[1] = rate;
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err = misc_write(vexpress_cfg, 0, buffer, 2 * sizeof(u32));
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if (err < 0)
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return err;
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return rate;
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}
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#endif
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static struct clk_ops vexpress_osc_clk_ops = {
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.get_rate = vexpress_osc_clk_get_rate,
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#ifndef CONFIG_SPL_BUILD
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.set_rate = vexpress_osc_clk_set_rate,
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#endif
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};
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static int vexpress_osc_clk_probe(struct udevice *dev)
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{
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struct vexpress_osc_clk_priv *priv = dev_get_priv(dev);
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u32 values[2];
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int err;
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err = dev_read_u32_array(dev, "freq-range", values, 2);
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if (err)
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return err;
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priv->rate_min = values[0];
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priv->rate_max = values[1];
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err = dev_read_u32_array(dev, "arm,vexpress-sysreg,func", values, 2);
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if (err)
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return err;
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if (values[0] != 1) {
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dev_err(dev, "Invalid VExpress function for clock, must be '1'");
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return -EINVAL;
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}
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priv->osc = values[1];
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debug("clk \"%s%d\", min freq %luHz, max freq %luHz\n", dev->name,
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priv->osc, priv->rate_min, priv->rate_max);
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return 0;
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}
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static const struct udevice_id vexpress_osc_clk_ids[] = {
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{ .compatible = "arm,vexpress-osc", },
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{}
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};
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U_BOOT_DRIVER(vexpress_osc_clk) = {
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.name = "vexpress_osc_clk",
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.id = UCLASS_CLK,
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.of_match = vexpress_osc_clk_ids,
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.ops = &vexpress_osc_clk_ops,
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.priv_auto_alloc_size = sizeof(struct vexpress_osc_clk_priv),
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.probe = vexpress_osc_clk_probe,
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};
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