Hi, On Mon, 8 Aug 2016 23:24:03 +0200 Linus Walleij wrote: > This adds a driver for the Qualcomm External Bus Interface EBI2 > found in the MSM8660 and APQ8060 SoCs (at least). > > This was tested with the SMSC9112 ethernet on the APQ8060 > Dragonboard sitting on top of the SLOW CS2. > > Some of my understanding if very vague and based on guesses and > extrapolations: the documentation in APQ8060 Qualcomm Application > Processor User Guide 80-N7150-14 Rev. A describes select features but > does not document the register bit fields. > > However I had to do something like this to provide a serious driver, > I have marked the guesses with /* GUESS */ > > Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> > --- > drivers/soc/qcom/Kconfig | 8 + > drivers/soc/qcom/Makefile | 1 + > drivers/soc/qcom/ebi2.c | 371 ++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 380 insertions(+) > create mode 100644 drivers/soc/qcom/ebi2.c > > diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig > index 461b387d03cc..1f56baa30807 100644 > --- a/drivers/soc/qcom/Kconfig > +++ b/drivers/soc/qcom/Kconfig > @@ -76,3 +76,11 @@ config QCOM_WCNSS_CTRL > help > Client driver for the WCNSS_CTRL SMD channel, used to download nv > firmware to a newly booted WCNSS chip. > + > +config QCOM_EBI2 > + bool "Qualcomm External Bus Interface 2 (EBI2)" > + default y if ARCH_MSM8X60 > + help > + Say y here to enable support for the Qualcomm External Bus > + Interface 2, which can be used to connect things like NAND Flash, > + SRAM, ethernet adapters, FPGAs and LCD displays. > diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile > index fdd664edf0bd..8d5a8d738d0a 100644 > --- a/drivers/soc/qcom/Makefile > +++ b/drivers/soc/qcom/Makefile > @@ -7,3 +7,4 @@ obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o > obj-$(CONFIG_QCOM_SMP2P) += smp2p.o > obj-$(CONFIG_QCOM_SMSM) += smsm.o > obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o > +obj-$(CONFIG_QCOM_EBI2) += ebi2.o > diff --git a/drivers/soc/qcom/ebi2.c b/drivers/soc/qcom/ebi2.c > new file mode 100644 > index 000000000000..f90c5d13fb5a > --- /dev/null > +++ b/drivers/soc/qcom/ebi2.c > @@ -0,0 +1,371 @@ > +/* > + * Qualcomm External Bus Interface 2 (EBI2) driver > + * an older version of the Qualcomm Parallel Interface Controller (QPIC) > + * > + * Copyright (C) 2016 Linaro Ltd. > + * > + * Author: Linus Walleij <linus.walleij@xxxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2, as > + * published by the Free Software Foundation. > + * > + * See the device tree bindings for this block for more details on the > + * hardware. > + */ > + > +#include <linux/clk.h> > +#include <linux/err.h> > +#include <linux/io.h> > +#include <linux/of.h> > +#include <linux/of_platform.h> > +#include <linux/init.h> > +#include <linux/io.h> > +#include <linux/slab.h> > +#include <linux/platform_device.h> > +#include <linux/bitops.h> > + > +/* Guessed bit placement CS2 and CS3 are certain */ > +/* What about CS1A, CS1B, CS2A, CS2B? */ > +#define EBI2_CS0_ENABLE BIT(2) /* GUESS */ > +#define EBI2_CS1_ENABLE BIT(3) /* GUESS */ > +#define EBI2_CS2_ENABLE BIT(4) > +#define EBI2_CS3_ENABLE BIT(5) > +#define EBI2_CS4_ENABLE BIT(6) /* GUESS */ > +#define EBI2_CS5_ENABLE BIT(7) /* GUESS */ > +#define EBI2_CSN_MASK BIT(2)|BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7) > + missing '()' around expression, otherwise... > + csval &= ~EBI2_CSN_MASK; ...this will be '~BIT(2) | BIT(3) | BIT(4) | BIT(5) | BIT(6) | BIT(7)' which is most likely NOT what's intended. (Also spaces around the '|' operator would improve readability) Lothar Waßmann -- To unsubscribe from this list: send the line "unsubscribe linux-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
