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[93.34.88.225]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-442d67ee275sm100615165e9.19.2025.05.11.13.13.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 May 2025 13:13:28 -0700 (PDT) From: Christian Marangi To: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Lorenzo Bianconi , Heiner Kallweit , Russell King , Philipp Zabel , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Christian Marangi , Daniel Golle , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, llvm@lists.linux.dev Subject: [net-next PATCH v4 05/11] net: pcs: implement Firmware node support for PCS driver Date: Sun, 11 May 2025 22:12:31 +0200 Message-ID: <20250511201250.3789083-6-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250511201250.3789083-1-ansuelsmth@gmail.com> References: <20250511201250.3789083-1-ansuelsmth@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Implement the foundation of Firmware node support for PCS driver. To support this, implement a simple Provider API where a PCS driver can expose multiple PCS with an xlate .get function. PCS driver will have to call fwnode_pcs_add_provider() and pass the firmware node pointer and a xlate function to return the correct PCS for the passed #pcs-cells. This will register the PCS in a global list of providers so that consumer can access it. The consumer will then use fwnode_pcs_get() to get the actual PCS by passing the firmware node pointer and the index for #pcs-cells. For a simple implementation where #pcs-cells is 0 and the PCS driver expose a single PCS, the xlate function fwnode_pcs_simple_get() is provided. For an advanced implementation a custom xlate function is required. One removal the PCS driver should first delete itself from the provider list using fwnode_pcs_del_provider() and then call phylink_release_pcs() on every PCS the driver provides. A generic function fwnode_phylink_pcs_parse() is provided for MAC driver that will declare PCS in DT (or ACPI). This function will parse "pcs-handle" property and fill the passed array with the parsed PCS in availabel_pcs up to the passed num_pcs value. It's also possible to pass NULL as array to only parse the PCS and update the num_pcs value with the count of scanned PCS. Co-developed-by: Daniel Golle Signed-off-by: Daniel Golle Signed-off-by: Christian Marangi --- drivers/net/pcs/Kconfig | 6 + drivers/net/pcs/Makefile | 1 + drivers/net/pcs/pcs.c | 201 +++++++++++++++++++++++++++++++ include/linux/pcs/pcs-provider.h | 41 +++++++ include/linux/pcs/pcs.h | 56 +++++++++ 5 files changed, 305 insertions(+) create mode 100644 drivers/net/pcs/pcs.c create mode 100644 include/linux/pcs/pcs-provider.h create mode 100644 include/linux/pcs/pcs.h diff --git a/drivers/net/pcs/Kconfig b/drivers/net/pcs/Kconfig index f6aa437473de..0d54bea1f663 100644 --- a/drivers/net/pcs/Kconfig +++ b/drivers/net/pcs/Kconfig @@ -5,6 +5,12 @@ =20 menu "PCS device drivers" =20 +config FWNODE_PCS + tristate + depends on (ACPI || OF) + help + Firmware node PCS accessors + config PCS_XPCS tristate "Synopsys DesignWare Ethernet XPCS" select PHYLINK diff --git a/drivers/net/pcs/Makefile b/drivers/net/pcs/Makefile index 4f7920618b90..3005cdd89ab7 100644 --- a/drivers/net/pcs/Makefile +++ b/drivers/net/pcs/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 # Makefile for Linux PCS drivers =20 +obj-$(CONFIG_FWNODE_PCS) +=3D pcs.o pcs_xpcs-$(CONFIG_PCS_XPCS) :=3D pcs-xpcs.o pcs-xpcs-plat.o \ pcs-xpcs-nxp.o pcs-xpcs-wx.o =20 diff --git a/drivers/net/pcs/pcs.c b/drivers/net/pcs/pcs.c new file mode 100644 index 000000000000..26d07a2edfce --- /dev/null +++ b/drivers/net/pcs/pcs.c @@ -0,0 +1,201 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include +#include +#include + +MODULE_DESCRIPTION("PCS library"); +MODULE_AUTHOR("Christian Marangi "); +MODULE_LICENSE("GPL"); + +struct fwnode_pcs_provider { + struct list_head link; + + struct fwnode_handle *fwnode; + struct phylink_pcs *(*get)(struct fwnode_reference_args *pcsspec, + void *data); + + void *data; +}; + +static LIST_HEAD(fwnode_pcs_providers); +static DEFINE_MUTEX(fwnode_pcs_mutex); + +struct phylink_pcs *fwnode_pcs_simple_get(struct fwnode_reference_args *pc= sspec, + void *data) +{ + return data; +} +EXPORT_SYMBOL_GPL(fwnode_pcs_simple_get); + +int fwnode_pcs_add_provider(struct fwnode_handle *fwnode, + struct phylink_pcs *(*get)(struct fwnode_reference_args *pcsspec, + void *data), + void *data) +{ + struct fwnode_pcs_provider *pp; + + if (!fwnode) + return 0; + + pp =3D kzalloc(sizeof(*pp), GFP_KERNEL); + if (!pp) + return -ENOMEM; + + pp->fwnode =3D fwnode_handle_get(fwnode); + pp->data =3D data; + pp->get =3D get; + + mutex_lock(&fwnode_pcs_mutex); + list_add(&pp->link, &fwnode_pcs_providers); + mutex_unlock(&fwnode_pcs_mutex); + pr_debug("Added pcs provider from %pfwf\n", fwnode); + + fwnode_dev_initialized(fwnode, true); + + return 0; +} +EXPORT_SYMBOL_GPL(fwnode_pcs_add_provider); + +void fwnode_pcs_del_provider(struct fwnode_handle *fwnode) +{ + struct fwnode_pcs_provider *pp; + + if (!fwnode) + return; + + mutex_lock(&fwnode_pcs_mutex); + list_for_each_entry(pp, &fwnode_pcs_providers, link) { + if (pp->fwnode =3D=3D fwnode) { + list_del(&pp->link); + fwnode_dev_initialized(pp->fwnode, false); + fwnode_handle_put(pp->fwnode); + kfree(pp); + break; + } + } + mutex_unlock(&fwnode_pcs_mutex); +} +EXPORT_SYMBOL_GPL(fwnode_pcs_del_provider); + +static int fwnode_parse_pcsspec(const struct fwnode_handle *fwnode, int in= dex, + const char *name, + struct fwnode_reference_args *out_args) +{ + int ret; + + if (!fwnode) + return -ENOENT; + + if (name) + index =3D fwnode_property_match_string(fwnode, "pcs-names", + name); + + ret =3D fwnode_property_get_reference_args(fwnode, "pcs-handle", + "#pcs-cells", + -1, index, out_args); + if (ret || (name && index < 0)) + return ret; + + return 0; +} + +static struct phylink_pcs * +fwnode_pcs_get_from_pcsspec(struct fwnode_reference_args *pcsspec) +{ + struct fwnode_pcs_provider *provider; + struct phylink_pcs *pcs =3D ERR_PTR(-EPROBE_DEFER); + + if (!pcsspec) + return ERR_PTR(-EINVAL); + + mutex_lock(&fwnode_pcs_mutex); + list_for_each_entry(provider, &fwnode_pcs_providers, link) { + if (provider->fwnode =3D=3D pcsspec->fwnode) { + pcs =3D provider->get(pcsspec, provider->data); + if (!IS_ERR(pcs)) + break; + } + } + mutex_unlock(&fwnode_pcs_mutex); + + return pcs; +} + +static struct phylink_pcs *__fwnode_pcs_get(struct fwnode_handle *fwnode, + int index, const char *con_id) +{ + struct fwnode_reference_args pcsspec; + struct phylink_pcs *pcs; + int ret; + + ret =3D fwnode_parse_pcsspec(fwnode, index, con_id, &pcsspec); + if (ret) + return ERR_PTR(ret); + + pcs =3D fwnode_pcs_get_from_pcsspec(&pcsspec); + fwnode_handle_put(pcsspec.fwnode); + + return pcs; +} + +struct phylink_pcs *fwnode_pcs_get(struct fwnode_handle *fwnode, int index) +{ + return __fwnode_pcs_get(fwnode, index, NULL); +} +EXPORT_SYMBOL_GPL(fwnode_pcs_get); + +static int fwnode_phylink_pcs_count(struct fwnode_handle *fwnode, + unsigned int *num_pcs) +{ + struct fwnode_reference_args out_args; + int index =3D 0; + int ret; + + while (true) { + ret =3D fwnode_property_get_reference_args(fwnode, "pcs-handle", + "#pcs-cells", + -1, index, &out_args); + /* We expect to reach an -ENOENT error while counting */ + if (ret) + break; + + fwnode_handle_put(out_args.fwnode); + index++; + } + + /* Update num_pcs with parsed PCS */ + *num_pcs =3D index; + + /* Return error if we didn't found any PCS */ + return index > 0 ? 0 : -ENOENT; +} + +int fwnode_phylink_pcs_parse(struct fwnode_handle *fwnode, + struct phylink_pcs **available_pcs, + unsigned int *num_pcs) +{ + int i; + + if (!fwnode_property_present(fwnode, "pcs-handle")) + return -ENODEV; + + /* With available_pcs NULL, only count the PCS */ + if (!available_pcs) + return fwnode_phylink_pcs_count(fwnode, num_pcs); + + for (i =3D 0; i < *num_pcs; i++) { + struct phylink_pcs *pcs; + + pcs =3D fwnode_pcs_get(fwnode, i); + if (IS_ERR(pcs)) + return PTR_ERR(pcs); + + available_pcs[i] =3D pcs; + } + + return 0; +} +EXPORT_SYMBOL_GPL(fwnode_phylink_pcs_parse); diff --git a/include/linux/pcs/pcs-provider.h b/include/linux/pcs/pcs-provi= der.h new file mode 100644 index 000000000000..ae51c108147e --- /dev/null +++ b/include/linux/pcs/pcs-provider.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __LINUX_PCS_PROVIDER_H +#define __LINUX_PCS_PROVIDER_H + +/** + * fwnode_pcs_simple_get - Simple xlate function to retrieve PCS + * @pcsspec: reference arguments + * @data: Context data (assumed assigned to the single PCS) + * + * Returns: the PCS pointed by data. + */ +struct phylink_pcs *fwnode_pcs_simple_get(struct fwnode_reference_args *pc= sspec, + void *data); + +/** + * fwnode_pcs_add_provider - Registers a new PCS provider + * @fwnode: Firmware node + * @get: xlate function to retrieve the PCS + * @data: Context data + * + * Register and add a new PCS to the global providers list + * for the firmware node. A function to get the PCS from + * firmware node with the use fwnode reference arguments. + * To the get function is also passed the interface type + * requested for the PHY. PCS driver will use the passed + * interface to understand if the PCS can support it or not. + * + * Returns: 0 on success or -ENOMEM on allocation failure. + */ +int fwnode_pcs_add_provider(struct fwnode_handle *fwnode, + struct phylink_pcs *(*get)(struct fwnode_reference_args *pcsspec, + void *data), + void *data); + +/** + * fwnode_pcs_del_provider - Removes a PCS provider + * @fwnode: Firmware node + */ +void fwnode_pcs_del_provider(struct fwnode_handle *fwnode); + +#endif /* __LINUX_PCS_PROVIDER_H */ diff --git a/include/linux/pcs/pcs.h b/include/linux/pcs/pcs.h new file mode 100644 index 000000000000..33244e3a442b --- /dev/null +++ b/include/linux/pcs/pcs.h @@ -0,0 +1,56 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __LINUX_PCS_H +#define __LINUX_PCS_H + +#include + +#if IS_ENABLED(CONFIG_FWNODE_PCS) +/** + * fwnode_pcs_get - Retrieves a PCS from a firmware node + * @fwnode: firmware node + * @index: index fwnode PCS handle in firmware node + * + * Get a PCS from the firmware node at index. + * + * Returns: a pointer to the phylink_pcs or a negative + * error pointer. Can return -EPROBE_DEFER if the PCS is not + * present in global providers list (either due to driver + * still needs to be probed or it failed to probe/removed) + */ +struct phylink_pcs *fwnode_pcs_get(struct fwnode_handle *fwnode, + int index); + +/** + * fwnode_phylink_pcs_parse - generic PCS parse for fwnode PCS provider + * @fwnode: firmware node + * @available_pcs: pointer to preallocated array of PCS + * @num_pcs: where to store count of parsed PCS + * + * Generic helper function to fill available_pcs array with PCS parsed + * from a "pcs-handle" fwnode property defined in firmware node up to + * passed num_pcs. + * + * If available_pcs is NULL, num_pcs is updated with the count of the + * parsed PCS. + * + * Returns: 0 or a negative error. + */ +int fwnode_phylink_pcs_parse(struct fwnode_handle *fwnode, + struct phylink_pcs **available_pcs, + unsigned int *num_pcs); +#else +static inline struct phylink_pcs *fwnode_pcs_get(struct fwnode_handle *fwn= ode, + int index) +{ + return ERR_PTR(-ENOENT); +} + +static inline int fwnode_phylink_pcs_parse(struct fwnode_handle *fwnode, + struct phylink_pcs **available_pcs, + unsigned int *num_pcs) +{ + return -EOPNOTSUPP; +} +#endif + +#endif /* __LINUX_PCS_H */ --=20 2.48.1