On Wed, 5 Nov 2014 17:53:42 +0100 Jean-Jacques Hiblot <jjhiblot@xxxxxxxxxxxxxxx> wrote: > 2014-11-05 17:01 GMT+01:00 Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>: > > 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@xxxxxxxxxxxxxxx> > > Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx> > > --- > > 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 :-) -- Boris Brezillon, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
