From mboxrd@z Thu Jan 1 00:00:00 1970 From: christopher.lee.bostic@gmail.com Subject: [PATCH v2 03/18] drivers/fsi: Add fsi master definition Date: Thu, 12 Jan 2017 16:24:14 -0600 Message-ID: <1484259854-79127-1-git-send-email-christopher.lee.bostic@gmail.com> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk, gregkh@linuxfoundation.org, mturquette@baylibre.com, geert+renesas@glider.be, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, joel@jms.id.au, jk@ozlabs.org, linux-kernel@vger.kernel.org, andrew@aj.id.au, alistair@popple.id.au, benh@kernel.crashing.org Cc: Chris Bostic List-Id: devicetree@vger.kernel.org From: Jeremy Kerr Signed-off-by: Jeremy Kerr Signed-off-by: Chris Bostic --- V2 - Change atomic global keeping track of master number to ida simple interface. - Add valid pointer checks on entry to register and unregister. --- drivers/fsi/fsi-core.c | 28 ++++++++++++++++++++++++++++ drivers/fsi/fsi-master.h | 37 +++++++++++++++++++++++++++++++++++++ 2 files changed, 65 insertions(+) create mode 100644 drivers/fsi/fsi-master.h diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 3d55bd5..c7469fe 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -16,6 +16,34 @@ #include #include #include +#include + +#include "fsi-master.h" + +static DEFINE_IDA(master_ida); + +/* FSI master support */ + +int fsi_master_register(struct fsi_master *master) +{ + if (!master || !master->dev) + return -EINVAL; + + master->idx = ida_simple_get(&master_ida, 0, 0, GFP_KERNEL); + get_device(master->dev); + return 0; +} +EXPORT_SYMBOL_GPL(fsi_master_register); + +void fsi_master_unregister(struct fsi_master *master) +{ + if (!master || !master->dev) + return; + + ida_simple_remove(&master_ida, master->idx); + put_device(master->dev); +} +EXPORT_SYMBOL_GPL(fsi_master_unregister); /* FSI core & Linux bus type definitions */ diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h new file mode 100644 index 0000000..e75a810 --- /dev/null +++ b/drivers/fsi/fsi-master.h @@ -0,0 +1,37 @@ +/* + * FSI master definitions. These comprise the core <--> master interface, + * to allow the core to interact with the (hardware-specific) masters. + * + * Copyright (C) IBM Corporation 2016 + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef DRIVERS_FSI_MASTER_H +#define DRIVERS_FSI_MASTER_H + +#include + +struct fsi_master { + struct device *dev; + int idx; + int n_links; + int (*read)(struct fsi_master *, int link, + uint8_t slave, uint32_t addr, + void *val, size_t size); + int (*write)(struct fsi_master *, int link, + uint8_t slave, uint32_t addr, + const void *val, size_t size); +}; + +extern int fsi_master_register(struct fsi_master *master); +extern void fsi_master_unregister(struct fsi_master *master); + +#endif /* DRIVERS_FSI_MASTER_H */ -- 1.8.2.2