From patchwork Fri Sep 16 16:02:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Russell King \(Oracle\)" X-Patchwork-Id: 606566 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 36E47C54EE9 for ; Fri, 16 Sep 2022 16:03:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230159AbiIPQDJ (ORCPT ); Fri, 16 Sep 2022 12:03:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38218 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230088AbiIPQCx (ORCPT ); Fri, 16 Sep 2022 12:02:53 -0400 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [IPv6:2001:4d48:ad52:32c8:5054:ff:fe00:142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D7516B56F1; Fri, 16 Sep 2022 09:02:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Date:Sender:Message-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References: In-Reply-To:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=q2B4e2Yl5JI9c7GcwkHC7CEN29XU0TUjbG9EmvqhnvM=; b=oQixZ3YVrRF9z4yMCiLM+eSC6u pxRtUj71H7UE4YwG9YubCZhX5QeXZ2nXtO8mNMPFVi2d7EpFumG64akrIKUzF47g/v74bRSdNiZrk ynkPoFHy3QySuDf7Cow7P/crkkYSPqSOIdkUhWgoYZFlTS+nNTyb1dhWNEkIfvMlNybyolQEQ/0ls Ora7Kg6czuwadi+jGXsh7p3yguLLj8A0/Xc/XAdPGeEDsbHKg5Os7JgVE7qOG+MHULtZAbimONrTc BuCnnYmx39/RjxkIUA1iQDEgGdrx+5kk42FHcnPMezRRI0in0OXo/n0eXX8v8AhTfmcp6lkAHAeaI jVeOA+Tw==; Received: from e0022681537dd.dyn.armlinux.org.uk ([fd8f:7570:feb6:1:222:68ff:fe15:37dd]:40116 helo=rmk-PC.armlinux.org.uk) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1oZDnj-0006uJ-7X; Fri, 16 Sep 2022 17:02:47 +0100 Received: from rmk by rmk-PC.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1oZDni-0077aM-I6; Fri, 16 Sep 2022 17:02:46 +0100 In-Reply-To: References: From: Russell King (Oracle) To: Arend van Spriel , Franky Lin , Hante Meuleman Cc: Alyssa Rosenzweig , asahi@lists.linux.dev, brcm80211-dev-list.pdl@broadcom.com, "David S. Miller" , devicetree@vger.kernel.org, Eric Dumazet , Hector Martin , Jakub Kicinski , Kalle Valo , Krzysztof Kozlowski , linux-arm-kernel@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, Paolo Abeni , "Rafa__ Mi__ecki" , Rob Herring , SHA-cyfmac-dev-list@infineon.com, Sven Peter Subject: [PATCH wireless-next v3 05/12] brcmfmac: pcie: Read Apple OTP information MIME-Version: 1.0 Content-Disposition: inline Message-Id: Sender: Russell King Date: Fri, 16 Sep 2022 17:02:46 +0100 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Hector Martin On Apple platforms, the One Time Programmable ROM in the Broadcom chips contains information about the specific board design (module, vendor, version) that is required to select the correct NVRAM file. Parse this OTP ROM and extract the required strings. Note that the user OTP offset/size is per-chip. This patch does not add any chips yet. Reviewed-by: Arend van Spriel Signed-off-by: Hector Martin Signed-off-by: Russell King (Oracle) --- .../broadcom/brcm80211/brcmfmac/pcie.c | 218 ++++++++++++++++++ include/linux/bcma/bcma_driver_chipcommon.h | 1 + 2 files changed, 219 insertions(+) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c index 2a74c9d8d46a..76ca835378bb 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c @@ -256,6 +256,15 @@ struct brcmf_pcie_core_info { u32 wrapbase; }; +#define BRCMF_OTP_MAX_PARAM_LEN 16 + +struct brcmf_otp_params { + char module[BRCMF_OTP_MAX_PARAM_LEN]; + char vendor[BRCMF_OTP_MAX_PARAM_LEN]; + char version[BRCMF_OTP_MAX_PARAM_LEN]; + bool valid; +}; + struct brcmf_pciedev_info { enum brcmf_pcie_state state; bool in_irq; @@ -283,6 +292,7 @@ struct brcmf_pciedev_info { void (*write_ptr)(struct brcmf_pciedev_info *devinfo, u32 mem_offset, u16 value); struct brcmf_mp_device *settings; + struct brcmf_otp_params otp; }; struct brcmf_pcie_ringbuf { @@ -354,6 +364,14 @@ static void brcmf_pcie_setup(struct device *dev, int ret, static struct brcmf_fw_request * brcmf_pcie_prepare_fw_request(struct brcmf_pciedev_info *devinfo); +static u16 +brcmf_pcie_read_reg16(struct brcmf_pciedev_info *devinfo, u32 reg_offset) +{ + void __iomem *address = devinfo->regs + reg_offset; + + return ioread16(address); +} + static u32 brcmf_pcie_read_reg32(struct brcmf_pciedev_info *devinfo, u32 reg_offset) { @@ -499,6 +517,8 @@ brcmf_pcie_copy_dev_tomem(struct brcmf_pciedev_info *devinfo, u32 mem_offset, } +#define READCC32(devinfo, reg) brcmf_pcie_read_reg32(devinfo, \ + CHIPCREGOFFS(reg)) #define WRITECC32(devinfo, reg, value) brcmf_pcie_write_reg32(devinfo, \ CHIPCREGOFFS(reg), value) @@ -1734,6 +1754,198 @@ static const struct brcmf_buscore_ops brcmf_pcie_buscore_ops = { .write32 = brcmf_pcie_buscore_write32, }; +#define BRCMF_OTP_SYS_VENDOR 0x15 +#define BRCMF_OTP_BRCM_CIS 0x80 + +#define BRCMF_OTP_VENDOR_HDR 0x00000008 + +static int +brcmf_pcie_parse_otp_sys_vendor(struct brcmf_pciedev_info *devinfo, + u8 *data, size_t size) +{ + int idx = 4; + const char *chip_params; + const char *board_params; + const char *p; + + /* 4-byte header and two empty strings */ + if (size < 6) + return -EINVAL; + + if (get_unaligned_le32(data) != BRCMF_OTP_VENDOR_HDR) + return -EINVAL; + + chip_params = &data[idx]; + + /* Skip first string, including terminator */ + idx += strnlen(chip_params, size - idx) + 1; + if (idx >= size) + return -EINVAL; + + board_params = &data[idx]; + + /* Skip to terminator of second string */ + idx += strnlen(board_params, size - idx); + if (idx >= size) + return -EINVAL; + + /* At this point both strings are guaranteed NUL-terminated */ + brcmf_dbg(PCIE, "OTP: chip_params='%s' board_params='%s'\n", + chip_params, board_params); + + p = skip_spaces(board_params); + while (*p) { + char tag = *p++; + const char *end; + size_t len; + + if (*p++ != '=') /* implicit NUL check */ + return -EINVAL; + + /* *p might be NUL here, if so end == p and len == 0 */ + end = strchrnul(p, ' '); + len = end - p; + + /* leave 1 byte for NUL in destination string */ + if (len > (BRCMF_OTP_MAX_PARAM_LEN - 1)) + return -EINVAL; + + /* Copy len characters plus a NUL terminator */ + switch (tag) { + case 'M': + strscpy(devinfo->otp.module, p, len + 1); + break; + case 'V': + strscpy(devinfo->otp.vendor, p, len + 1); + break; + case 'm': + strscpy(devinfo->otp.version, p, len + 1); + break; + } + + /* Skip to next arg, if any */ + p = skip_spaces(end); + } + + brcmf_dbg(PCIE, "OTP: module=%s vendor=%s version=%s\n", + devinfo->otp.module, devinfo->otp.vendor, + devinfo->otp.version); + + if (!devinfo->otp.module[0] || + !devinfo->otp.vendor[0] || + !devinfo->otp.version[0]) + return -EINVAL; + + devinfo->otp.valid = true; + return 0; +} + +static int +brcmf_pcie_parse_otp(struct brcmf_pciedev_info *devinfo, u8 *otp, size_t size) +{ + int p = 0; + int ret = -EINVAL; + + brcmf_dbg(PCIE, "parse_otp size=%zd\n", size); + + while (p < (size - 1)) { + u8 type = otp[p]; + u8 length = otp[p + 1]; + + if (type == 0) + break; + + if ((p + 2 + length) > size) + break; + + switch (type) { + case BRCMF_OTP_SYS_VENDOR: + brcmf_dbg(PCIE, "OTP @ 0x%x (%d): SYS_VENDOR\n", + p, length); + ret = brcmf_pcie_parse_otp_sys_vendor(devinfo, + &otp[p + 2], + length); + break; + case BRCMF_OTP_BRCM_CIS: + brcmf_dbg(PCIE, "OTP @ 0x%x (%d): BRCM_CIS\n", + p, length); + break; + default: + brcmf_dbg(PCIE, "OTP @ 0x%x (%d): Unknown type 0x%x\n", + p, length, type); + break; + } + + p += 2 + length; + } + + return ret; +} + +static int brcmf_pcie_read_otp(struct brcmf_pciedev_info *devinfo) +{ + const struct pci_dev *pdev = devinfo->pdev; + struct brcmf_bus *bus = dev_get_drvdata(&pdev->dev); + u32 coreid, base, words, idx, sromctl; + u16 *otp; + struct brcmf_core *core; + int ret; + + switch (devinfo->ci->chip) { + default: + /* OTP not supported on this chip */ + return 0; + } + + core = brcmf_chip_get_core(devinfo->ci, coreid); + if (!core) { + brcmf_err(bus, "No OTP core\n"); + return -ENODEV; + } + + if (coreid == BCMA_CORE_CHIPCOMMON) { + /* Chips with OTP accessed via ChipCommon need additional + * handling to access the OTP + */ + brcmf_pcie_select_core(devinfo, coreid); + sromctl = READCC32(devinfo, sromcontrol); + + if (!(sromctl & BCMA_CC_SROM_CONTROL_OTP_PRESENT)) { + /* Chip lacks OTP, try without it... */ + brcmf_err(bus, + "OTP unavailable, using default firmware\n"); + return 0; + } + + /* Map OTP to shadow area */ + WRITECC32(devinfo, sromcontrol, + sromctl | BCMA_CC_SROM_CONTROL_OTPSEL); + } + + otp = kcalloc(words, sizeof(u16), GFP_KERNEL); + if (!otp) + return -ENOMEM; + + /* Map bus window to SROM/OTP shadow area in core */ + base = brcmf_pcie_buscore_prep_addr(devinfo->pdev, base + core->base); + + brcmf_dbg(PCIE, "OTP data:\n"); + for (idx = 0; idx < words; idx++) { + otp[idx] = brcmf_pcie_read_reg16(devinfo, base + 2 * idx); + brcmf_dbg(PCIE, "[%8x] 0x%04x\n", base + 2 * idx, otp[idx]); + } + + if (coreid == BCMA_CORE_CHIPCOMMON) { + brcmf_pcie_select_core(devinfo, coreid); + WRITECC32(devinfo, sromcontrol, sromctl); + } + + ret = brcmf_pcie_parse_otp(devinfo, (u8 *)otp, 2 * words); + kfree(otp); + + return ret; +} + #define BRCMF_PCIE_FW_CODE 0 #define BRCMF_PCIE_FW_NVRAM 1 #define BRCMF_PCIE_FW_CLM 2 @@ -1930,6 +2142,12 @@ brcmf_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (ret) goto fail_bus; + ret = brcmf_pcie_read_otp(devinfo); + if (ret) { + brcmf_err(bus, "failed to parse OTP\n"); + goto fail_brcmf; + } + fwreq = brcmf_pcie_prepare_fw_request(devinfo); if (!fwreq) { ret = -ENOMEM; diff --git a/include/linux/bcma/bcma_driver_chipcommon.h b/include/linux/bcma/bcma_driver_chipcommon.h index e3314f746bfa..2d94c30ed439 100644 --- a/include/linux/bcma/bcma_driver_chipcommon.h +++ b/include/linux/bcma/bcma_driver_chipcommon.h @@ -271,6 +271,7 @@ #define BCMA_CC_SROM_CONTROL_OP_WRDIS 0x40000000 #define BCMA_CC_SROM_CONTROL_OP_WREN 0x60000000 #define BCMA_CC_SROM_CONTROL_OTPSEL 0x00000010 +#define BCMA_CC_SROM_CONTROL_OTP_PRESENT 0x00000020 #define BCMA_CC_SROM_CONTROL_LOCK 0x00000008 #define BCMA_CC_SROM_CONTROL_SIZE_MASK 0x00000006 #define BCMA_CC_SROM_CONTROL_SIZE_1K 0x00000000