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Message-ID: <CACh+v5MiqKVQA7mt8CjMGwmwuO45P2udX5a0ctvuyCAZ1UBKAA@mail.gmail.com> Date: Wed, 5 Nov 2014 18:05:07 +0100 From: Jean-Jacques Hiblot <jjhiblot@...phandler.com> To: Boris Brezillon <boris.brezillon@...e-electrons.com> Cc: Jean-Jacques Hiblot <jjhiblot@...phandler.com>, Samuel Ortiz <sameo@...ux.intel.com>, Lee Jones <lee.jones@...aro.org>, Nicolas Ferre <nicolas.ferre@...el.com>, Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>, Alexandre Belloni <alexandre.belloni@...e-electrons.com>, Andrew Victor <linux@...im.org.za>, Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>, Mark Rutland <mark.rutland@....com>, Ian Campbell <ijc+devicetree@...lion.org.uk>, Kumar Gala <galak@...eaurora.org>, devicetree <devicetree@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v2 05/11] memory: add Atmel EBI (External Bus Interface) driver 2014-11-05 17:59 GMT+01:00 Boris Brezillon <boris.brezillon@...e-electrons.com>: > On Wed, 5 Nov 2014 17:53:42 +0100 > Jean-Jacques Hiblot <jjhiblot@...phandler.com> wrote: > >> 2014-11-05 17:01 GMT+01:00 Boris Brezillon <boris.brezillon@...e-electrons.com>: >> > The EBI (External Bus Interface) is used to access external peripherals >> > (NOR, SRAM, NAND, and other specific devices like ethernet controllers). >> > Each device is assigned a CS line and an address range and can have its >> > own configuration (timings, access mode, bus width, ...). >> > This driver provides a generic DT binding to configure a device according >> > to its requirements. >> > For specific device controllers (like the NAND one) the SMC timings >> > should be configured by the controller driver through the matrix and >> > smc syscon regmaps. >> > >> > Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com> >> > Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com> >> > --- >> > drivers/memory/Kconfig | 11 + >> > drivers/memory/Makefile | 1 + >> > drivers/memory/atmel-ebi.c | 615 +++++++++++++++++++++++++++++++++++++++++++++ >> > 3 files changed, 627 insertions(+) >> > create mode 100644 drivers/memory/atmel-ebi.c >> > >> > diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig >> > index 6d91c27..dfe24a2 100644 >> > --- a/drivers/memory/Kconfig >> > +++ b/drivers/memory/Kconfig >> > @@ -17,6 +17,17 @@ config ATMEL_SDRAMC >> > Starting with the at91sam9g45, this controller supports SDR, DDR and >> > LP-DDR memories. >> > >> > +config ATMEL_EBI >> > + bool "Atmel EBI driver" >> > + default y >> > + depends on ARCH_AT91 && OF >> > + select MFD_SYSCON >> > + help >> > + Driver for Atmel EBI controller. >> > + Used to configure the EBI (external bus interface) when the device- >> > + tree is used. This bus supports NANDs, external ethernet controller, >> > + SRAMs, ATA devices, etc. >> > + >> > config TI_AEMIF >> > tristate "Texas Instruments AEMIF driver" >> > depends on (ARCH_DAVINCI || ARCH_KEYSTONE) && OF >> > diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile >> > index c32d319..7ca2c19 100644 >> > --- a/drivers/memory/Makefile >> > +++ b/drivers/memory/Makefile >> > @@ -6,6 +6,7 @@ ifeq ($(CONFIG_DDR),y) >> > obj-$(CONFIG_OF) += of_memory.o >> > endif >> > obj-$(CONFIG_ATMEL_SDRAMC) += atmel-sdramc.o >> > +obj-$(CONFIG_ATMEL_EBI) += atmel-ebi.o >> > obj-$(CONFIG_TI_AEMIF) += ti-aemif.o >> > obj-$(CONFIG_TI_EMIF) += emif.o >> > obj-$(CONFIG_FSL_CORENET_CF) += fsl-corenet-cf.o >> > diff --git a/drivers/memory/atmel-ebi.c b/drivers/memory/atmel-ebi.c >> > new file mode 100644 >> > index 0000000..41bc893 >> > --- /dev/null >> > +++ b/drivers/memory/atmel-ebi.c >> > @@ -0,0 +1,615 @@ >> > +/* >> > + * EBI driver for Atmel SAM9 chips >> > + * inspired by the fsl weim bus driver >> > + * >> > + * Copyright (C) 2013 JJ Hiblot. >> > + * >> > + * This file is licensed under the terms of the GNU General Public >> > + * License version 2. This program is licensed "as is" without any >> > + * warranty of any kind, whether express or implied. >> > + */ >> > + >> > +#include <linux/clk.h> >> > +#include <linux/io.h> >> > +#include <linux/mfd/syscon.h> >> > +#include <linux/mfd/syscon/atmel-matrix.h> >> > +#include <linux/mfd/syscon/atmel-smc.h> >> > +#include <linux/module.h> >> > +#include <linux/of_device.h> >> > +#include <linux/regmap.h> >> > + >> > +#define AT91SAM9_SMC_READ_MODE_MSK BIT(0) >> > +#define AT91SAM9_SMC_READ_NCS_MODE 0 >> > +#define AT91SAM9_SMC_READ_NRD_MODE 1 >> > +#define AT91SAM9_SMC_WRITE_MODE_MSK BIT(1) >> > +#define AT91SAM9_SMC_WRITE_NCS_MODE (0 << 1) >> > +#define AT91SAM9_SMC_WRITE_NWE_MODE (1 << 1) >> > +#define AT91SAM9_SMC_EXNW_MODE_MSK GENMASK(5, 4) >> > +#define AT91SAM9_SMC_EXNW_DIS (0 << 4) >> > +#define AT91SAM9_SMC_EXNW_FROZEN (2 << 4) >> > +#define AT91SAM9_SMC_EXNW_READY (3 << 4) >> > +#define AT91SAM9_SMC_BAT_MSK BIT(8) >> > +#define AT91SAM9_SMC_BAT_SELECT (0 << 8) >> > +#define AT91SAM9_SMC_BAT_WRITE (1 << 8) >> > +#define AT91SAM9_SMC_DBW_MSK GENMASK(13, 12) >> > +#define AT91SAM9_SMC_DBW(x) ((((x) / 16) & 0x3) << 12) >> > +#define AT91SAM9_SMC_TDF_CYCLES_MSK GENMASK(19, 16) >> > +#define AT91SAM9_SMC_TDF_CYCLES(x) (((x) & 0xf) << 16) >> > +#define AT91SAM9_SMC_TDF_MODE_MSK BIT(20) >> > +#define AT91SAM9_SMC_TDF_OPTIMIZED (1 << 20) >> > +#define AT91SAM9_SMC_PMEN BIT(24) >> > +#define AT91SAM9_SMC_PS(x) ((((x) / 4) & 0x3) << 28) >> >> Those definitions are now also available in >> linux/mfd/syscon/atmel-smc.h.For consistency sake, this driver should >> probably use the new ones. > > That was my intention, I just forgot to cleanup this part... > >> BTW this patch should probably be applied after patch 3 "mfd: syscon: >> Add atmel-smc registers definition" and patch 1 "mfd: syscon: Add >> atmel-matrix registers definition" >> > > And it is: patch 05/11 :-) Damn gmail again for showing it under [Patch 00/11] ! It's definitely not the ideal review tool :-) > > -- > Boris Brezillon, Free Electrons > Embedded Linux and Kernel engineering > http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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