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![Masahiro Yamada](/assets/img/avatar_default.png)
Putting zero length array at the end of struct is a common technique to embed arbitrary length of members. There is no good reason to let regmap_alloc_count() branch by "if (count <= 1)". As far as I understood the code, regmap->base is an alias of regmap->ranges[0].start, but it is not helpful but make the code just ugly. Rename regmap_alloc_count() to regmap_alloc() because the _count suffix seems pointless. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Simon Glass <sjg@chromium.org> [trini: fixup cpu_info-rcar.c] Signed-off-by: Tom Rini <trini@konsulko.com>
181 lines
4.0 KiB
C
181 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 <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_alloc_size = sizeof(struct sti_usb_phy),
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};
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