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Wed, 17 Apr 2019 01:41:48 -0500 Received: from DFLE105.ent.ti.com (10.64.6.26) by DFLE112.ent.ti.com (10.64.6.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Wed, 17 Apr 2019 01:41:47 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE105.ent.ti.com (10.64.6.26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Wed, 17 Apr 2019 01:41:47 -0500 Received: from [172.24.190.89] (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id x3H6fg96060951; Wed, 17 Apr 2019 01:41:43 -0500 Subject: Re: [PATCH v3 3/5] mtd: Add support for HyperBus memory devices To: Sergei Shtylyov , David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Rob Herring References: <20190412092923.24919-1-vigneshr@ti.com> <20190412092923.24919-4-vigneshr@ti.com> <53a92396-2535-ace7-3a31-1daf719ff323@cogentembedded.com> From: Vignesh Raghavendra Message-ID: Date: Wed, 17 Apr 2019 12:12:41 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <53a92396-2535-ace7-3a31-1daf719ff323@cogentembedded.com> Content-Language: en-US X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190416_234159_660236_EB7FB42A X-CRM114-Status: GOOD ( 25.71 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Tudor Ambarus , nsekhar@ti.com, linux-kernel@vger.kernel.org, Joakim Tjernlund , linux-mtd@lists.infradead.org, Miquel Raynal , Mason Yang , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org Hi, On 14/04/19 11:21 PM, Sergei Shtylyov wrote: > Hello! > > On 04/12/2019 12:29 PM, Vignesh Raghavendra wrote: > >> Cypress' HyperBus is Low Signal Count, High Performance Double Data Rate >> Bus interface between a host system master and one or more slave >> interfaces. HyperBus is used to connect microprocessor, microcontroller, >> or ASIC devices with random access NOR flash memory (called HyperFlash) >> or self refresh DRAM (called HyperRAM). >> >> Its a 8-bit data bus (DQ[7:0]) with Read-Write Data Strobe (RWDS) >> signal and either Single-ended clock(3.0V parts) or Differential clock >> (1.8V parts). It uses ChipSelect lines to select b/w multiple slaves. >> At bus level, it follows a separate protocol described in HyperBus >> specification[1]. >> >> HyperFlash follows CFI AMD/Fujitsu Extended Command Set (0x0002) similar >> to that of existing parallel NORs. Since HyperBus is x8 DDR bus, >> its equivalent to x16 parallel NOR flash wrt bits per clock cycle. But >> HyperBus operates at >166MHz frequencies. >> HyperRAM provides direct random read/write access to flash memory >> array. >> >> But, HyperBus memory controllers seem to abstract implementation details >> and expose a simple MMIO interface to access connected flash. >> >> Add support for registering HyperFlash devices with MTD framework. MTD >> maps framework along with CFI chip support framework are used to support >> communicating with flash. >> >> Framework is modelled along the lines of spi-nor framework. HyperBus >> memory controller (HBMC) drivers calls hyperbus_register_device() to >> register a single HyperFlash device. HyperFlash core parses MMIO access >> information from DT, sets up the map_info struct, probes CFI flash and >> registers it with MTD framework. >> >> Some HBMC masters need calibration/training sequence[3] to be carried >> out, in order for DLL inside the controller to lock, by reading a known >> string/pattern. This is done by repeatedly reading CFI Query >> Identification String. Calibration needs to be done before trying to detect >> flash as part of CFI flash probe. >> >> HyperRAM is not supported at the moment. >> >> HyperBus specification can be found at[1] >> HyperFlash datasheet can be found at[2] >> >> [1] https://www.cypress.com/file/213356/download >> [2] https://www.cypress.com/file/213346/download >> [3] http://www.ti.com/lit/ug/spruid7b/spruid7b.pdf >> Table 12-5741. HyperFlash Access Sequence >> >> Signed-off-by: Vignesh Raghavendra > [...] >> diff --git a/drivers/mtd/hyperbus/Kconfig b/drivers/mtd/hyperbus/Kconfig >> new file mode 100644 >> index 000000000000..98147e28caa0 >> --- /dev/null >> +++ b/drivers/mtd/hyperbus/Kconfig >> @@ -0,0 +1,11 @@ >> +menuconfig MTD_HYPERBUS >> + tristate "HyperBus support" >> + select MTD_CFI >> + select MTD_MAP_BANK_WIDTH_2 >> + select MTD_CFI_AMDSTD >> + select MTD_COMPLEX_MAPPINGS >> + help >> + This is the framework for the HyperBus which can be used by >> + the HyperBus Controller driver to communicate with >> + HyperFlash. See Cypress HyperBus specification for more >> + details >> diff --git a/drivers/mtd/hyperbus/Makefile b/drivers/mtd/hyperbus/Makefile >> new file mode 100644 >> index 000000000000..ca61dedd730d >> --- /dev/null >> +++ b/drivers/mtd/hyperbus/Makefile >> @@ -0,0 +1,3 @@ >> +# SPDX-License-Identifier: GPL-2.0 >> + >> +obj-$(CONFIG_MTD_HYPERBUS) += hyperbus-core.o >> diff --git a/drivers/mtd/hyperbus/hyperbus-core.c b/drivers/mtd/hyperbus/hyperbus-core.c >> new file mode 100644 >> index 000000000000..49aeb59742c6 >> --- /dev/null >> +++ b/drivers/mtd/hyperbus/hyperbus-core.c >> @@ -0,0 +1,192 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +// >> +// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ >> +// Author: Vignesh Raghavendra > [...] >> +/* Default calibration routine for use by HyperBus controller. >> + * Controller is calibrated by repeatedly reading known pattern ("QRY" >> + * string from CFI space) >> + * Lets ensure "QRY" string is read correctly at least 5 times to ensure >> + * stability of the DLL lock. >> + */ >> +int hyperbus_calibrate(struct hyperbus_device *hbdev) >> +{ >> + struct map_info *map = &hbdev->map; >> + struct cfi_private cfi; >> + int count = HYPERBUS_CALIB_COUNT; >> + int pass_count = 0; >> + int ret; >> + >> + cfi.interleave = 1; >> + cfi.device_type = CFI_DEVICETYPE_X16; >> + cfi_send_gen_cmd(0xF0, 0, 0, map, &cfi, cfi.device_type, NULL); >> + cfi_send_gen_cmd(0x98, 0x55, 0, map, &cfi, cfi.device_type, NULL); >> + >> + while (count--) { >> + cfi_qry_present(map, 0, &cfi); >> + ret = cfi_qry_present(map, 0, &cfi); > > Why call it twice in a row? > Oops, will fix in v2 >> + if (ret) >> + pass_count++; >> + else >> + pass_count = 0; >> + if (pass_count == 5) >> + break; >> + } >> + >> + cfi_qry_mode_off(0, map, &cfi); >> + >> + return ret; >> +} >> +EXPORT_SYMBOL_GPL(hyperbus_calibrate); > [...] >> diff --git a/include/linux/mtd/hyperbus.h b/include/linux/mtd/hyperbus.h >> new file mode 100644 >> index 000000000000..19340cc56aa4 >> --- /dev/null >> +++ b/include/linux/mtd/hyperbus.h >> @@ -0,0 +1,91 @@ > [...] >> +/** >> + * hb_unregister_device - deregister HyperBus slave memory device > > You forgot to update the function name in the kernel-doc. :-) > Indeed, thanks for catching this! >> + * @hbdev: hyperbus_device to be unregistered >> + * >> + * Return: 0 for success, others for failure. >> + */ >> +int hyperbus_unregister_device(struct hyperbus_device *hbdev); >> + >> +#endif /* __LINUX_MTD_HYPERBUS_H__ */ > > MBR, Sergei > -- Regards Vignesh ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/