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[217.226.151.187]) by smtp.gmail.com with ESMTPSA id u5sm7349201wrr.94.2021.08.20.18.09.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Aug 2021 18:09:15 -0700 (PDT) Received: from chuck by debian64.daheim with local (Exim 4.94.2) (envelope-from ) id 1mHFVb-0046Wz-9A; Sat, 21 Aug 2021 03:09:15 +0200 From: Christian Lamparter To: linux-wireless@vger.kernel.org, devicetree@vger.kernel.org, ath9k-devel@qca.qualcomm.com Subject: [RFC PATCH v1 3/3] ath9k: owl-loader: fetch pci init values through nvmem Date: Sat, 21 Aug 2021 03:09:15 +0200 Message-Id: X-Mailer: git-send-email 2.33.0 In-Reply-To: <91e68ca7f65bee7197ed5829ef91bc526df16e8a.1629508039.git.chunkeey@gmail.com> References: <91e68ca7f65bee7197ed5829ef91bc526df16e8a.1629508039.git.chunkeey@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org extends the owl loader to fetch important pci initialization values - which are stored together with the calibration data - through the nvmem subsystem. This allows for much faster WIFI/ath9k initializations on devices that do not require to perform any post-processing (like XOR'ing/ reversal or unpacking) since no userspace helper is required. Signed-off-by: Christian Lamparter --- .../wireless/ath/ath9k/ath9k_pci_owl_loader.c | 105 +++++++++++++----- 1 file changed, 76 insertions(+), 29 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/ath9k_pci_owl_loader.c b/drivers/net/wireless/ath/ath9k/ath9k_pci_owl_loader.c index 56d1a7764b9f..708c8969b503 100644 --- a/drivers/net/wireless/ath/ath9k/ath9k_pci_owl_loader.c +++ b/drivers/net/wireless/ath/ath9k/ath9k_pci_owl_loader.c @@ -19,9 +19,14 @@ #include #include #include +#include +#include struct owl_ctx { + struct pci_dev *pdev; struct completion eeprom_load; + struct work_struct work; + struct nvmem_cell *cell; }; #define EEPROM_FILENAME_LEN 100 @@ -42,6 +47,12 @@ static int ath9k_pci_fixup(struct pci_dev *pdev, const u16 *cal_data, u32 bar0; bool swap_needed = false; + /* also note that we are doing *u16 operations on the file */ + if (cal_len > 4096 || cal_len < 0x200 || (cal_len & 1) == 1) { + dev_err(&pdev->dev, "eeprom has an invalid size.\n"); + return -EINVAL; + } + if (*cal_data != AR5416_EEPROM_MAGIC) { if (*cal_data != swab16(AR5416_EEPROM_MAGIC)) { dev_err(&pdev->dev, "invalid calibration data\n"); @@ -99,38 +110,31 @@ static int ath9k_pci_fixup(struct pci_dev *pdev, const u16 *cal_data, return 0; } -static void owl_fw_cb(const struct firmware *fw, void *context) +static void owl_rescan(struct pci_dev *pdev) { - struct pci_dev *pdev = (struct pci_dev *)context; - struct owl_ctx *ctx = (struct owl_ctx *)pci_get_drvdata(pdev); - struct pci_bus *bus; - - complete(&ctx->eeprom_load); - - if (!fw) { - dev_err(&pdev->dev, "no eeprom data received.\n"); - goto release; - } - - /* also note that we are doing *u16 operations on the file */ - if (fw->size > 4096 || fw->size < 0x200 || (fw->size & 1) == 1) { - dev_err(&pdev->dev, "eeprom file has an invalid size.\n"); - goto release; - } - - if (ath9k_pci_fixup(pdev, (const u16 *)fw->data, fw->size)) - goto release; + struct pci_bus *bus = pdev->bus; pci_lock_rescan_remove(); - bus = pdev->bus; pci_stop_and_remove_bus_device(pdev); /* the device should come back with the proper * ProductId. But we have to initiate a rescan. */ pci_rescan_bus(bus); pci_unlock_rescan_remove(); +} + +static void owl_fw_cb(const struct firmware *fw, void *context) +{ + struct owl_ctx *ctx = (struct owl_ctx *)context; + + complete(&ctx->eeprom_load); -release: + if (fw) { + ath9k_pci_fixup(ctx->pdev, (const u16 *)fw->data, fw->size); + owl_rescan(ctx->pdev); + } else { + dev_err(&ctx->pdev->dev, "no eeprom data received.\n"); + } release_firmware(fw); } @@ -152,6 +156,43 @@ static const char *owl_get_eeprom_name(struct pci_dev *pdev) return eeprom_name; } +static void owl_nvmem_work(struct work_struct *work) +{ + struct owl_ctx *ctx = container_of(work, struct owl_ctx, work); + void *buf; + size_t len; + + complete(&ctx->eeprom_load); + + buf = nvmem_cell_read(ctx->cell, &len); + if (!IS_ERR(buf)) { + ath9k_pci_fixup(ctx->pdev, buf, len); + kfree(buf); + owl_rescan(ctx->pdev); + } else { + dev_err(&ctx->pdev->dev, "no nvmem data received.\n"); + } +} + +static int owl_nvmem_probe(struct owl_ctx *ctx) +{ + int err; + + ctx->cell = devm_nvmem_cell_get(&ctx->pdev->dev, "calibration"); + if (IS_ERR(ctx->cell)) { + err = PTR_ERR(ctx->cell); + if (err == -ENOENT || err == -EOPNOTSUPP) + return 1; /* not present, try firmware_request */ + + return err; + } + + INIT_WORK(&ctx->work, owl_nvmem_work); + schedule_work(&ctx->work); + + return 0; +} + static int owl_probe(struct pci_dev *pdev, const struct pci_device_id *id) { @@ -164,21 +205,27 @@ static int owl_probe(struct pci_dev *pdev, pcim_pin_device(pdev); - eeprom_name = owl_get_eeprom_name(pdev); - if (!eeprom_name) { - dev_err(&pdev->dev, "no eeprom filename found.\n"); - return -ENODEV; - } - ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); if (!ctx) return -ENOMEM; init_completion(&ctx->eeprom_load); + ctx->pdev = pdev; pci_set_drvdata(pdev, ctx); + + err = owl_nvmem_probe(ctx); + if (err <= 0) + return err; + + eeprom_name = owl_get_eeprom_name(pdev); + if (!eeprom_name) { + dev_err(&pdev->dev, "no eeprom filename found.\n"); + return -ENODEV; + } + err = request_firmware_nowait(THIS_MODULE, true, eeprom_name, - &pdev->dev, GFP_KERNEL, pdev, owl_fw_cb); + &pdev->dev, GFP_KERNEL, ctx, owl_fw_cb); if (err) dev_err(&pdev->dev, "failed to request caldata (%d).\n", err);