[U-Boot] [PATCH v7 04/10] usb: phy: Add STi USB2 PHY
Patrice CHOTARD
patrice.chotard at st.com
Mon Jun 5 06:58:12 UTC 2017
Hi Marek
On 06/03/2017 08:08 AM, Marek Vasut wrote:
> On 06/01/2017 02:05 PM, patrice.chotard at st.com wrote:
>> From: Patrice Chotard <patrice.chotard at st.com>
>>
>> This is the generic phy driver for the picoPHY ports
>> used by USB2/1.1 controllers. It is found on STiH407 SoC
>> family from STMicroelectronics.
>>
>> Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
>> Reviewed-by: Marek Vasut <marex at denx.de>
>> ---
>> v7: _ replace fdtdec_parse_phandle_with_args() by dev_read_phandle_with_args()
>> _ replace uclass_get_device_by_of_offset() by uclass_get_device_by_ofnode()
>>
>
> You should drop RB if you do significant changes.
>
>>
>> v5: _ add Reviewed-by: Marek Vasut <marex at denx.de>
>>
>> v4: _ update to use the new PHY uclass currently available on dm-next branch
>>
>> v3: _ convert driver to USB PHY uclass
>>
>> v2: _ replace bitfield_replace() by clrsetbits_le32()
>>
>> doc/device-tree-bindings/phy/phy-stih407-usb.txt | 24 +++
>> drivers/phy/Kconfig | 8 +
>> drivers/phy/Makefile | 1 +
>> drivers/phy/sti_usb_phy.c | 181 +++++++++++++++++++++++
>> 4 files changed, 214 insertions(+)
>> create mode 100644 doc/device-tree-bindings/phy/phy-stih407-usb.txt
>> create mode 100644 drivers/phy/sti_usb_phy.c
>>
>> diff --git a/doc/device-tree-bindings/phy/phy-stih407-usb.txt b/doc/device-tree-bindings/phy/phy-stih407-usb.txt
>> new file mode 100644
>> index 0000000..de6a706
>> --- /dev/null
>> +++ b/doc/device-tree-bindings/phy/phy-stih407-usb.txt
>> @@ -0,0 +1,24 @@
>> +ST STiH407 USB PHY controller
>> +
>> +This file documents the dt bindings for the usb picoPHY driver which is the PHY for both USB2 and USB3
>> +host controllers (when controlling usb2/1.1 devices) available on STiH407 SoC family from STMicroelectronics.
>> +
>> +Required properties:
>> +- compatible : should be "st,stih407-usb2-phy"
>> +- st,syscfg : phandle of sysconfig bank plus integer array containing phyparam and phyctrl register offsets
>> +- resets : list of phandle and reset specifier pairs. There should be two entries, one
>> + for the whole phy and one for the port
>> +- reset-names : list of reset signal names. Should be "global" and "port"
>> +See: Documentation/devicetree/bindings/reset/st,sti-powerdown.txt
>> +See: Documentation/devicetree/bindings/reset/reset.txt
>> +
>> +Example:
>> +
>> +usb2_picophy0: usbpicophy at f8 {
>
> This example uses address, but has no reg property ?
Agree, but following advices from Arnd Bergman about not mixing address
space and sysconfig registers int the reg property, the reg property was
removed.
For more details, see https://patches.linaro.org/patch/44081/
>
>> + compatible = "st,stih407-usb2-phy";
>> + #phy-cells = <0>;
>> + st,syscfg = <&syscfg_core 0x100 0xf4>;
>> + resets = <&softreset STIH407_PICOPHY_SOFTRESET>,
>> + <&picophyreset STIH407_PICOPHY0_RESET>;
>> + reset-names = "global", "port";
>> +};
>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> index a91a694..4330b36 100644
>> --- a/drivers/phy/Kconfig
>> +++ b/drivers/phy/Kconfig
>> @@ -59,4 +59,12 @@ config SPL_PIPE3_PHY
>> This PHY is found on omap devices supporting SATA such as dra7, am57x
>> and omap5
>>
>> +config STI_USB_PHY
>> + bool "STMicroelectronics USB2 picoPHY driver for STiH407 family"
>> + depends on PHY && ARCH_STI
>> + help
>> + This is the generic phy driver for the picoPHY ports
>> + used by USB2 and USB3 Host controllers available on
>> + STiH407 SoC families.
>> +
>> endmenu
>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>> index 6ce96d2..22d92d3 100644
>> --- a/drivers/phy/Makefile
>> +++ b/drivers/phy/Makefile
>> @@ -8,3 +8,4 @@
>> obj-$(CONFIG_$(SPL_)PHY) += phy-uclass.o
>> obj-$(CONFIG_PHY_SANDBOX) += sandbox-phy.o
>> obj-$(CONFIG_$(SPL_)PIPE3_PHY) += ti-pipe3-phy.o
>> +obj-$(CONFIG_STI_USB_PHY) += sti_usb_phy.o
>> diff --git a/drivers/phy/sti_usb_phy.c b/drivers/phy/sti_usb_phy.c
>> new file mode 100644
>> index 0000000..0e0b1c0
>> --- /dev/null
>> +++ b/drivers/phy/sti_usb_phy.c
>> @@ -0,0 +1,181 @@
>> +/*
>> + * Copyright (c) 2017
>> + * Patrice Chotard <patrice.chotard at st.com>
>> + *
>> + * SPDX-License-Identifier: GPL-2.0+
>> + */
>> +
>> +#include <common.h>
>> +#include <asm/io.h>
>> +#include <bitfield.h>
>> +#include <dm.h>
>> +#include <errno.h>
>> +#include <fdtdec.h>
>> +#include <generic-phy.h>
>> +#include <libfdt.h>
>> +#include <regmap.h>
>> +#include <reset-uclass.h>
>> +#include <syscon.h>
>> +#include <wait_bit.h>
>> +
>> +#include <linux/bitops.h>
>> +#include <linux/compat.h>
>> +
>> +DECLARE_GLOBAL_DATA_PTR;
>> +
>> +/* Default PHY_SEL and REFCLKSEL configuration */
>> +#define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6
>> +
>> +/* ports parameters overriding */
>> +#define STIH407_USB_PICOPHY_PARAM_DEF 0x39a4dc
>> +
>> +#define PHYPARAM_REG 1
>> +#define PHYCTRL_REG 2
>> +#define PHYPARAM_NB 3
>> +
>> +struct sti_usb_phy {
>> + struct regmap *regmap;
>> + struct reset_ctl global_ctl;
>> + struct reset_ctl port_ctl;
>> + int param;
>> + int ctrl;
>> +};
>> +
>> +static int sti_usb_phy_deassert(struct sti_usb_phy *phy)
>> +{
>> + int ret;
>> +
>> + ret = reset_deassert(&phy->global_ctl);
>> + if (ret < 0) {
>> + error("PHY global deassert failed: %d", ret);
>> + return ret;
>> + }
>> +
>> + ret = reset_deassert(&phy->port_ctl);
>> + if (ret < 0)
>> + error("PHY port deassert failed: %d", ret);
>> +
>> + return ret;
>> +}
>> +
>> +static int sti_usb_phy_init(struct phy *usb_phy)
>> +{
>> + struct udevice *dev = usb_phy->dev;
>> + struct sti_usb_phy *phy = dev_get_priv(dev);
>> + void __iomem *reg;
>> +
>> + /* set ctrl picophy value */
>> + reg = (void __iomem *)phy->regmap->base + phy->ctrl;
>> + /* CTRL_PORT mask is 0x1f */
>> + clrsetbits_le32(reg, 0x1f, STIH407_USB_PICOPHY_CTRL_PORT_CONF);
>> +
>> + /* set ports parameters overriding */
>> + reg = (void __iomem *)phy->regmap->base + phy->param;
>> + /* PARAM_DEF mask is 0xffffffff */
>> + clrsetbits_le32(reg, 0xffffffff, STIH407_USB_PICOPHY_PARAM_DEF);
>> +
>> + return sti_usb_phy_deassert(phy);
>> +}
>> +
>> +static int sti_usb_phy_exit(struct phy *usb_phy)
>> +{
>> + struct udevice *dev = usb_phy->dev;
>> + struct sti_usb_phy *phy = dev_get_priv(dev);
>> + int ret;
>> +
>> + ret = reset_assert(&phy->port_ctl);
>> + if (ret < 0) {
>> + error("PHY port assert failed: %d", ret);
>> + return ret;
>> + }
>> +
>> + ret = reset_assert(&phy->global_ctl);
>> + if (ret < 0)
>> + error("PHY global assert failed: %d", ret);
>> +
>> + return ret;
>> +}
>> +
>> +struct phy_ops sti_usb_phy_ops = {
>> + .init = sti_usb_phy_init,
>> + .exit = sti_usb_phy_exit,
>> +};
>> +
>> +int sti_usb_phy_probe(struct udevice *dev)
>> +{
>> + struct sti_usb_phy *priv = dev_get_priv(dev);
>> + struct udevice *syscon;
>> + struct ofnode_phandle_args syscfg_phandle;
>> + u32 cells[PHYPARAM_NB];
>> + int ret, count;
>> +
>> + /* get corresponding syscon phandle */
>> + ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
>> + &syscfg_phandle);
>> +
>> + if (ret < 0) {
>> + error("Can't get syscfg phandle: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + ret = uclass_get_device_by_ofnode(UCLASS_SYSCON, syscfg_phandle.node,
>> + &syscon);
>> + if (ret) {
>> + error("unable to find syscon device (%d)\n", ret);
>> + return ret;
>> + }
>> +
>> + priv->regmap = syscon_get_regmap(syscon);
>> + if (!priv->regmap) {
>> + error("unable to find regmap\n");
>> + return -ENODEV;
>> + }
>> +
>> + /* get phy param offset */
>> + count = fdtdec_get_int_array_count(gd->fdt_blob, dev_of_offset(dev),
>> + "st,syscfg", cells,
>> + ARRAY_SIZE(cells));
>> +
>> + if (count < 0) {
>> + error("Bad PHY st,syscfg property %d\n", count);
>> + return -EINVAL;
>> + }
>> +
>> + if (count > PHYPARAM_NB) {
>> + error("Unsupported PHY param count %d\n", count);
>> + return -EINVAL;
>> + }
>> +
>> + priv->param = cells[PHYPARAM_REG];
>> + priv->ctrl = cells[PHYCTRL_REG];
>> +
>> + /* get global reset control */
>> + ret = reset_get_by_name(dev, "global", &priv->global_ctl);
>> + if (ret) {
>> + error("can't get global reset for %s (%d)", dev->name, ret);
>> + return ret;
>> + }
>> +
>> + /* get port reset control */
>> + ret = reset_get_by_name(dev, "port", &priv->port_ctl);
>> + if (ret) {
>> + error("can't get port reset for %s (%d)", dev->name, ret);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static const struct udevice_id sti_usb_phy_ids[] = {
>> + { .compatible = "st,stih407-usb2-phy" },
>> + { }
>> +};
>> +
>> +U_BOOT_DRIVER(sti_usb_phy) = {
>> + .name = "sti_usb_phy",
>> + .id = UCLASS_PHY,
>> + .of_match = sti_usb_phy_ids,
>> + .probe = sti_usb_phy_probe,
>> + .ops = &sti_usb_phy_ops,
>> + .priv_auto_alloc_size = sizeof(struct sti_usb_phy),
>> +};
>>
>
>
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