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![Simon Glass](/assets/img/avatar_default.png)
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>
182 lines
4.0 KiB
C
182 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
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* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
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*/
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#include <common.h>
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#include <log.h>
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#include <asm/io.h>
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#include <bitfield.h>
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#include <dm.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <generic-phy.h>
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#include <linux/libfdt.h>
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#include <regmap.h>
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#include <reset-uclass.h>
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#include <syscon.h>
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#include <wait_bit.h>
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#include <linux/bitops.h>
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#include <linux/compat.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Default PHY_SEL and REFCLKSEL configuration */
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#define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6
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/* ports parameters overriding */
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#define STIH407_USB_PICOPHY_PARAM_DEF 0x39a4dc
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#define PHYPARAM_REG 1
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#define PHYCTRL_REG 2
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#define PHYPARAM_NB 3
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struct sti_usb_phy {
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struct regmap *regmap;
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struct reset_ctl global_ctl;
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struct reset_ctl port_ctl;
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int param;
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int ctrl;
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};
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static int sti_usb_phy_deassert(struct sti_usb_phy *phy)
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{
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int ret;
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ret = reset_deassert(&phy->global_ctl);
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if (ret < 0) {
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pr_err("PHY global deassert failed: %d", ret);
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return ret;
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}
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ret = reset_deassert(&phy->port_ctl);
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if (ret < 0)
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pr_err("PHY port deassert failed: %d", ret);
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return ret;
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}
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static int sti_usb_phy_init(struct phy *usb_phy)
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{
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struct udevice *dev = usb_phy->dev;
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struct sti_usb_phy *phy = dev_get_priv(dev);
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void __iomem *reg;
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/* set ctrl picophy value */
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reg = (void __iomem *)phy->regmap->ranges[0].start + phy->ctrl;
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/* CTRL_PORT mask is 0x1f */
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clrsetbits_le32(reg, 0x1f, STIH407_USB_PICOPHY_CTRL_PORT_CONF);
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/* set ports parameters overriding */
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reg = (void __iomem *)phy->regmap->ranges[0].start + phy->param;
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/* PARAM_DEF mask is 0xffffffff */
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clrsetbits_le32(reg, 0xffffffff, STIH407_USB_PICOPHY_PARAM_DEF);
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return sti_usb_phy_deassert(phy);
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}
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static int sti_usb_phy_exit(struct phy *usb_phy)
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{
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struct udevice *dev = usb_phy->dev;
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struct sti_usb_phy *phy = dev_get_priv(dev);
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int ret;
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ret = reset_assert(&phy->port_ctl);
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if (ret < 0) {
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pr_err("PHY port assert failed: %d", ret);
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return ret;
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}
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ret = reset_assert(&phy->global_ctl);
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if (ret < 0)
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pr_err("PHY global assert failed: %d", ret);
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return ret;
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}
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struct phy_ops sti_usb_phy_ops = {
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.init = sti_usb_phy_init,
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.exit = sti_usb_phy_exit,
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};
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int sti_usb_phy_probe(struct udevice *dev)
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{
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struct sti_usb_phy *priv = dev_get_priv(dev);
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struct udevice *syscon;
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struct ofnode_phandle_args syscfg_phandle;
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u32 cells[PHYPARAM_NB];
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int ret, count;
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/* get corresponding syscon phandle */
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ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
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&syscfg_phandle);
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if (ret < 0) {
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pr_err("Can't get syscfg phandle: %d\n", ret);
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return ret;
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}
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ret = uclass_get_device_by_ofnode(UCLASS_SYSCON, syscfg_phandle.node,
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&syscon);
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if (ret) {
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pr_err("unable to find syscon device (%d)\n", ret);
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return ret;
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}
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priv->regmap = syscon_get_regmap(syscon);
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if (!priv->regmap) {
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pr_err("unable to find regmap\n");
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return -ENODEV;
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}
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/* get phy param offset */
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count = fdtdec_get_int_array_count(gd->fdt_blob, dev_of_offset(dev),
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"st,syscfg", cells,
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ARRAY_SIZE(cells));
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if (count < 0) {
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pr_err("Bad PHY st,syscfg property %d\n", count);
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return -EINVAL;
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}
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if (count > PHYPARAM_NB) {
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pr_err("Unsupported PHY param count %d\n", count);
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return -EINVAL;
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}
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priv->param = cells[PHYPARAM_REG];
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priv->ctrl = cells[PHYCTRL_REG];
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/* get global reset control */
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ret = reset_get_by_name(dev, "global", &priv->global_ctl);
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if (ret) {
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pr_err("can't get global reset for %s (%d)", dev->name, ret);
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return ret;
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}
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/* get port reset control */
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ret = reset_get_by_name(dev, "port", &priv->port_ctl);
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if (ret) {
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pr_err("can't get port reset for %s (%d)", dev->name, ret);
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return ret;
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}
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return 0;
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}
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static const struct udevice_id sti_usb_phy_ids[] = {
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{ .compatible = "st,stih407-usb2-phy" },
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{ }
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};
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U_BOOT_DRIVER(sti_usb_phy) = {
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.name = "sti_usb_phy",
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.id = UCLASS_PHY,
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.of_match = sti_usb_phy_ids,
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.probe = sti_usb_phy_probe,
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.ops = &sti_usb_phy_ops,
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.priv_auto = sizeof(struct sti_usb_phy),
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};
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