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* drivers/fsi/scom: Remove reset before every putscomEdward A. James2017-08-281-6/+4
| | | | | | | | Reset causes problems for operations requiring multiple scoms (e.g. i2c over scom). Instead, reset scom engine during probe. Signed-off-by: Edward A. James <eajames@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: add const to bin_attribute structuresBhumika Goyal2017-08-281-2/+2
| | | | | | | | | Declare bin_attribute structures as const as they are only passed as an argument to the function device_create_bin_file. This argument is of type const, so declare the structure as const. Signed-off-by: Bhumika Goyal <bhumirks@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: fix fsi_slave_mode prototypeArnd Bergmann2017-07-171-1/+1
| | | | | | | | | | | | | | gcc warns about the return type of this function: drivers/fsi/fsi-core.c:535:8: error: type qualifiers ignored on function return type [-Werror=ignored-qualifiers] This removes the 'const' attribute, as suggested by the warning. Fixes: 2b37c3e285f9 ("drivers/fsi: Set slave SMODE to init communication") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* fsi: core: register with postcore_initcallJoel Stanley2017-07-171-3/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | When testing an i2c driver that is a fsi bus driver, I saw the following oops: kernel BUG at drivers/base/driver.c:153! Internal error: Oops - BUG: 0 [#1] ARM [<8027cb1c>] (driver_register) from [<80344e88>] (fsi_driver_register+0x2c/0x38) [<80344e88>] (fsi_driver_register) from [<805f5ebc>] (fsi_i2c_driver_init+0x1c/0x24) [<805f5ebc>] (fsi_i2c_driver_init) from [<805d1f14>] (do_one_initcall+0xb4/0x170) [<805d1f14>] (do_one_initcall) from [<805d20f0>] (kernel_init_freeable+0x120/0x1dc) [<805d20f0>] (kernel_init_freeable) from [<8043f4a8>] (kernel_init+0x18/0x104) [<8043f4a8>] (kernel_init) from [<8000a5e8>] (ret_from_fork+0x14/0x2c) This is because the fsi bus had not been registered. This fix registers the bus with postcore_initcall instead, to ensure it is registered earlier on. When the fsi core is used as a module this should not be a problem as the fsi driver will depend on the fsi bus type symbol, and will therefore load the core before the driver. Fixes: 0508ad1fff11 ("drivers/fsi: Add empty fsi bus definitions") Signed-off-by: Joel Stanley <joel@jms.id.au> Acked-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add module license to core driverChristopher Bostic2017-06-091-0/+1
| | | | | | | Add missing MODULE_LICENSE("GPL") to the core FSI driver. Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Use asynchronous slave modeJeremy Kerr2017-06-093-1/+24
| | | | | | | | | | For slaves that are behind a software-clocked master, we want FSI CFAMs to run asynchronously to the FSI clock, so set up our slaves to be in async mode. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add hub master supportChristopher Bostic2017-06-093-0/+336
| | | | | | | | | | | | | Add an engine driver to expose a "hub" FSI master - which has a set of control registers in the engine address space, and uses a chunk of the slave address space for actual FSI communication. Additional changes from Jeremy Kerr <jk@ozlabs.org>. Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add SCOM FSI client device driverChristopher Bostic2017-06-093-0/+269
| | | | | | | | | | | | | Create a simple SCOM engine device driver that reads and writes its control registers via an FSI bus. Includes changes from Edward A. James <eajames@us.ibm.com>. Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Edward A. James <eajames@us.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi/gpio: Add tracepoints for GPIO masterJeremy Kerr2017-06-091-0/+9
| | | | | | | | Trace low level input/output GPIO operations. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add GPIO based FSI masterChristopher Bostic2017-06-093-0/+607
| | | | | | | | | | | | | | | Implement a FSI master using GPIO. Will generate FSI protocol for read and write commands to particular addresses. Sends master command and waits for and decodes a slave response. Includes changes from Edward A. James <eajames@us.ibm.com> and Jeremy Kerr <jk@ozlabs.org>. Signed-off-by: Edward A. James <eajames@us.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add error handling for slaveJeremy Kerr2017-06-091-7/+114
| | | | | | | | | | This change implements error handling in the FSI core, by cleaining up and retrying failed operations, using the SISC, TERM and BREAK facilities. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add tracepoints for low-level operationsJeremy Kerr2017-06-091-6/+21
| | | | | | | | | Trace low level read and write FSI bus operations. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: expose direct-access slave APIJeremy Kerr2017-06-091-6/+24
| | | | | | | | | Allow drivers to access the slave address ranges. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add sysfs files for FSI master & slave accessesJeremy Kerr2017-06-091-0/+116
| | | | | | | | | | This change adds a 'raw' file for reads & writes, and a 'term' file for the TERM command, and a 'break' file for issuing a BREAK. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add client driver register utilitiesChristopher Bostic2017-06-091-0/+17
| | | | | | | | Add driver_register and driver_unregister wrappers for FSI. Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add master unscanChristopher Bostic2017-06-091-0/+44
| | | | | | | | | | | | | | Allow a master to undo a previous scan. Should a master scan a bus twice it will need to ensure it doesn't double register any previously detected device. Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> ---- v7 - Unscan when unregistering master - Remove leading '__'s from function names - Return fail state for sysfs rescan file Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add device read/write/peek APIJeremy Kerr2017-06-091-1/+49
| | | | | | | | | | | | | | This change introduces the fsi device API: simple read, write and peek accessors for the devices' address spaces. Includes contributions from Christopher Bostic <cbostic@linux.vnet.ibm.com> and Edward A. James <eajames@us.ibm.com>. Signed-off-by: Edward A. James <eajames@us.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: scan slaves & register devicesJeremy Kerr2017-06-091-1/+127
| | | | | | | | | | | | | Now that we have fsi_slave devices, scan each for endpoints, and register them on the fsi bus. Includes contributions from Christopher Bostic <cbostic@linux.vnet.ibm.com>. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Set slave SMODE to init communicationChristopher Bostic2017-06-091-0/+75
| | | | | | | | | | | | Set CFAM to appropriate ID so that the controlling master can manage link memory ranges. Add slave engine register definitions. Includes changes from Jeremy Kerr <jk@ozlabs.org>. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Implement slave initialisationJeremy Kerr2017-06-092-2/+66
| | | | | | | | | | | | Implement fsi_slave_init: if we can read a chip ID, create fsi_slave devices and register with the driver core. Includes changes from Christopher Bostic <cbostic@linux.vnet.ibm.com>. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Set up links for slave communicationChristopher Bostic2017-06-091-2/+35
| | | | | | | | | Enable each link and send a break command, and try to detect a slave by reading from the SMODE register. Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add slave & master read/write APIsJeremy Kerr2017-06-091-0/+92
| | | | | | | | | | | | | Introduce functions to perform reads/writes on the slave address space; these simply pass the request on the slave's master with the correct link and slave ID. We implement these on top of similar helpers for the master. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add empty master scanJeremy Kerr2017-06-091-2/+23
| | | | | | | | | | | | When a new fsi master is added, we will need to scan its links, and slaves attached to those links. This change introduces a little shell to iterate the links, which we will populate with the actual slave scan in a later change. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add slave definitionJeremy Kerr2017-06-091-0/+10
| | | | | | | | | | Add the initial fsi slave device, which is private to the core code. This will be a child of the master, and parent to endpoint devices. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add fsi master definitionJeremy Kerr2017-06-092-0/+76
| | | | | | | | | | | | | | | | Add a `struct fsi_master` to represent a FSI master controller. FSI master drivers register one of these structs to provide device-specific of the standard operations: read/write/term/break and link control. Includes changes from Edward A. James <eajames@us.ibm.com> & Jeremy Kerr <jk@ozlabs.org>. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: add driver to device matchesJeremy Kerr2017-02-101-0/+21
| | | | | | | | Driver bind to devices based on the engine types & (optional) versions. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Chris Bostic <cbostic@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/fsi: Add empty fsi bus definitionsJeremy Kerr2017-02-103-0/+52
This change adds the initial (empty) fsi bus definition, and introduces drivers/fsi/. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Chris Bostic <cbostic@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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