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* powerpc/serial: Use saner flags when creating legacy portsBenjamin Herrenschmidt2014-06-051-6/+9
| | | | | | | | | | | | | | | | | | We had a mix & match of flags used when creating legacy ports depending on where we found them in the device-tree. Among others we were missing UPF_SKIP_TEST for some kind of ISA ports which is a problem as quite a few UARTs out there don't support the loopback test (such as a lot of BMCs). Let's pick the set of flags used by the SoC code and generalize it which means autoconf, no loopback test, irq maybe shared and fixed port. Sending to stable as the lack of UPF_SKIP_TEST is breaking serial on some machines so I want this back into distros Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> CC: stable@vger.kernel.org
* powerpc/legacy_serial: Support MVME5100 UARTS with shifted registersStephen Chivers2014-04-281-6/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds support to legacy serial for UARTS with shifted registers. The MVME5100 Single Board Computer is a PowerPC platform that has 16550 style UARTS with register addresses that are 16 bytes apart (shifted by 4). Commit 309257484cc1a592e8ac5fbdd8cd661be2b80bf8 "powerpc: Cleanup udbg_16550 and add support for LPC PIO-only UARTs" added support to udbg_16550 for shifted registers by adding a "stride" parameter to the initialisation operations for Programmed IO and Memory Mapped IO. As a consequence it is now possible to use the services of legacy serial to provide early serial console messages for the MVME5100. An added benefit of this is that the serial console will always be "ttyS0" irrespective of whether the computer is fitted with extra PCI 8250 interface boards or not. I have tested this patch using the four PowerPC platforms available to me: MVME5100 - shifted registers, SAM440EP - unshifted registers, MPC8349 - unshifted registers, MVME4100 - unshifted registers. Signed-off-by: Stephen Chivers <schivers@csc.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc/legacy_serial: Fix incorrect placement of __initdata tagBartlomiej Zolnierkiewicz2013-10-111-1/+1
| | | | | | | | | __initdata tag should be placed between the variable name and equal sign for the variable to be placed in the intended .init.data section. Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Little endian fixes for legacy_serial.cAlistair Popple2013-08-141-3/+3
| | | | | Signed-off-by: Alistair Popple <alistair@popple.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Check "status" property before adding legacy ISA serial portsBenjamin Herrenschmidt2013-08-141-3/+5
| | | | Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Cleanup udbg_16550 and add support for LPC PIO-only UARTsBenjamin Herrenschmidt2013-08-141-14/+32
| | | | | | | | | | | | | | | | | The udbg_16550 code, which we use for our early consoles and debug backends was fairly messy. Especially for the debug consoles, it would re-implement the "high level" getc/putc/poll functions for each access method. It also had code to configure the UART but only for the straight MMIO method. This changes it to instead abstract at the register accessor level, and have the various functions and configuration routines use these. The result is simpler and slightly smaller code, and free support for non-MMIO mapped PIO UARTs, which such as the ones that can be present on a POWER 8 LPC bus. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Fix a number of sparse warningsAnton Blanchard2013-08-141-1/+1
| | | | | | | Address some of the trivial sparse warnings in arch/powerpc. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* Fix misspellings of "whether" in comments.Adam Buchbinder2012-11-191-1/+1
| | | | | | | | "Whether" is misspelled in various comments across the tree; this fixes them. No code changes. Signed-off-by: Adam Buchbinder <adam.buchbinder@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* powerpc: Fix build on some non-freescale platformsBenjamin Herrenschmidt2012-01-251-0/+2
| | | | | | | | | Commit 9deaa53ac7fa373623123aa4f18828dd62292b1a broke build on platforms that use legacy_serial.c without also having CONFIG_SERIAL_8250_FSL enabled due to an unconditional code to a routine in that module. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* serial: add irq handler for Freescale 16550 errata.Paul Gortmaker2011-12-091-0/+3
| | | | | | | | | | | | | | | | | | | | | | | Sending a break on the SOC UARTs found in some MPC83xx/85xx/86xx chips seems to cause a short lived IRQ storm (/proc/interrupts typically shows somewhere between 300 and 1500 events). Unfortunately this renders SysRQ over the serial console completely inoperable. The suggested workaround in the errata is to read the Rx register, wait one character period, and then read the Rx register again. We achieve this by tracking the old LSR value, and on the subsequent interrupt event after a break, we don't read LSR, instead we just read the RBR again and return immediately. The "fsl,ns16550" is used in the compatible field of the serial device to mark UARTs known to have this issue. Thanks to Scott Wood for providing the errata data which led to a much cleaner fix. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* serial/8250: Move UPIO_TSI to powerpcArnd Bergmann2011-09-201-0/+25
| | | | | | | | | | | | | | This iotype is only used by the legacy_serial code in powerpc, so the code should live there, rather than be compiled in for every 8250 driver. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: Greg Kroah-Hartman <gregkh@suse.de> Cc: linux-serial@vger.kernel.org Acked-by: David Daney <david.daney@cavium.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Check device status before adding serial devicePrabhakar Kushwaha2011-04-121-3/+5
| | | | | | | | serial port nodes with the property status="disabled" are not usable and so avoid adding "disabled" port with the system. Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
* powerpc, of_serial: Endianness issues setting up the serial portsIan Munsie2010-10-071-11/+11
| | | | | | | | | | | | The speed and clock of the serial ports is retrieved from the device tree in both the PowerPC legacy serial code and the Open Firmware serial driver, therefore they need to handle the fact that the device tree is always big endian, while the CPU may not be. Also fix other device tree references in the legacy serial code. Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
* of/address: Clean up function declarationsGrant Likely2010-08-011-0/+1
| | | | | | | | | | | | This patch moves the declaration of of_get_address(), of_get_pci_address(), and of_pci_address_to_resource() out of arch code and into the common linux/of_address header file. This patch also fixes some of the asm/prom.h ordering issues. It still includes some header files that it ideally shouldn't be, but at least the ordering is consistent now so that of_* overrides work. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
* Fix spelling of 'platform' in comments and docStefan Weil2010-02-051-1/+1
| | | | | | | | | Replace platfrom -> platform. This is a frequent spelling bug. Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* powerpc/powermac: Fixup default serial port device for pmac_zilogBenjamin Herrenschmidt2008-07-281-27/+17
| | | | | | | | This removes the non-working code in legacy_serial that tried to handle the powermac SCC ports, and instead add a (now working) function to the powermac platform code to find the default serial console if any. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* powerpc: Fix unterminated of_device_id array in legacy_serial.cBenjamin Herrenschmidt2008-07-071-2/+3
| | | | | | | | | | | | A recent patch to legacy_serial.c factored out some code by using the of_match_node() facility to match a node against an array of possible matches. However, the patch didn't properly terminate the array causing potential crashes in cases where no match is found. In addition, the name of the array was poorly chosen for a static symbol making debugging harder. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* powerpc/legacy_serial: Bail if reg-offset/shift properties are presentJohn Linn2008-07-011-0/+5
| | | | | | | | | The legacy serial driver does not work with an 8250 type UART that is described in the device tree with the reg-offset and reg-shift properties. This change makes legacy_serial ignore these devices. Signed-off-by: John Linn <john.linn@xilinx.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
* [POWERPC] Fix legacy serial search for opb bus portsMichael Ellerman2008-02-061-1/+2
| | | | | | | | | | | | | | | | | | | The patch to legacy_serial.c (1a7507c7da2df6856e085e0fbb0c9ea8c12ac4e, Reduce code duplication in legacy_serial, add UART parent types) changed the semantics for opb ports from type = "opb" || compatible = "ibm,opb" to type = "opb" && compatible = "ibm,opb". The result is serial ports on our QS21s (Cell blades) don't get found, and for some reason the machine doesn't boot at all - possibly it's panicking due to lack of a console? The fix is to add two entries to the of_device_id table, one that looks for type = "opb" and the other compatible = "ibm,opb". Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Acked-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] Reduce code duplication in legacy_serial, add UART parent typesPaul Gortmaker2008-01-281-28/+17
| | | | | | | | | | | The legacy_serial was treating each UART parent in a separate code block. Rather than continue this trend for the new parent IDs, this condenses all (soc, tsi, opb, plus two more new types) into one of_device_id array. The new types are wrs,epld-localbus for the Wind River sbc8560, and a more generic "simple-bus" as requested by Scott Wood. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
* [POWERPC] Use for_each macros in arch/powerpc/kernelCyrill Gorcunov2008-01-171-4/+4
| | | | | Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] arch/powerpc/: Spelling fixesjoe@perches.com2007-12-201-1/+1
| | | | | Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] Add legacy serial support for OPB with flattened device treeValentine Barshak2007-10-121-2/+3
| | | | | | | | | | | | | | | Currently find_legacy_serial_ports() can find no serial ports on the OPB with flattened device tree. Thus no legacy boot console can be initialized. Just the early udbg console works, which is initialized with udbg_init_44x_as1 on the UART's physical address specified in kernel config. This happens because we look for ns16750 serial devices only and expect opb node to have a device type property. This patch makes it look for ns16550-compatible devices and use of_device_is_compatible() for opb in case device type is not specified. Signed-off-by: Valentine Barshak <vbarshak@ru.mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] Move serial_dev_init to device_initcall()Olof Johansson2007-09-131-1/+1
| | | | | | | | | | | | | | With the I/O space rewrite by BenH, the legacy_serial serial_dev_init() initcall is now called before I/O space is setup, but it's dependent on it being available. Since there's no way to make dependencies between initcalls, we'll just have to move it to device_initcall(). Yes, it's suboptimal but I'm not aware of any better solution at this time, and it fixes a regression from 2.6.22. Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Paul Mackerras <paulus@samba.org>
* Merge branch 'linux-2.6'Paul Mackerras2007-05-081-1/+2
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| * serial: define FIXED_PORT flag for serial_coreDavid Gibson2007-05-071-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | At present, the serial core always allows setserial in userspace to change the port address, irq and base clock of any serial port. That makes sense for legacy ISA ports, but not for (say) embedded ns16550 compatible serial ports at peculiar addresses. In these cases, the kernel code configuring the ports must know exactly where they are, and their clocking arrangements (which can be unusual on embedded boards). It doesn't make sense for userspace to change these settings. Therefore, this patch defines a UPF_FIXED_PORT flag for the uart_port structure. If this flag is set when the serial port is configured, any attempts to alter the port's type, io address, irq or base clock with setserial are ignored. In addition this patch uses the new flag for on-chip serial ports probed in arch/powerpc/kernel/legacy_serial.c, and for other hard-wired serial ports probed by drivers/serial/of_serial.c. Signed-off-by: David Gibson <dwg@au1.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | [POWERPC] Rename device_is_compatible to of_device_is_compatibleStephen Rothwell2007-05-071-7/+7
|/ | | | | | | | | | | for consistency with other Open Firmware interfaces (and Sparc). This is just a straight replacement. This leaves the compatibility define in place. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] Rename get_property to of_get_property: arch/powerpcStephen Rothwell2007-04-131-12/+12
| | | | | | Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] Open Firmware serial port driverArnd Bergmann2007-02-141-0/+15
| | | | | | | | | | | | | | | | | This can be used for serial ports that are connected to an OF platform bus but are not autodetected by the lecacy serial support. It will automatically take over devices that come from the legacy serial detection, which usually is only one device. In some cases, rtas may be set up to use the serial port in the firmware, which allows easier debugging before probing the serial ports. In this case, the "used-by-rtas" property must be set by the firmware. This patch also adds code to the legacy serial driver to check for this. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] Dynamic kernel command-line: powerpcAlon Bar-Lev2007-02-121-1/+1
| | | | | | | | | | Rename saved_command_line into boot_command_line. Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'merge'Paul Mackerras2006-08-251-2/+6
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| * [POWERPC] Pass UPIO_TSI flag to 8259 serial driverZang Roy-r619112006-08-231-2/+6
| | | | | | | | | | | | | | The patch passes the UPIO_TSI flag to general 8259 serial driver Signed-off-by: Roy Zang <tie-fei.zang@freescale.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * [POWERPC] Fix legacy_serial.c error handling on 32 bitsBenjamin Herrenschmidt2006-07-261-5/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | The code in legacy_serial.c wouldn't properly compare OF translation results against OF_BAD_ADDR as it's using a phys_addr_t which is 32 bits on some 32-bit powerpc platforms. This fixes it by always using a u64 which is what is returned by the OF parsing routines. It also makes translation failure harmless for ISA serial ports. If they can't translate, we can't use the UART early, but we can still let the 8250 driver use it later on by using IO port accessors. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* | [POWERPC] Constify & voidify get_property()Jeremy Kerr2006-07-311-17/+18
| | | | | | | | | | | | | | | | | | | | | | Now that get_property() returns a void *, there's no need to cast its return value. Also, treat the return value as const, so we can constify get_property later. powerpc core changes. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* | [POWERPC] Fix legacy_serial.c error handling on 32 bitsBenjamin Herrenschmidt2006-07-071-5/+8
|/ | | | | | | | | | | | | The code in legacy_serial.c wouldn't properly compare OF translation results against OF_BAD_ADDR as it's using a phys_addr_t which is 32 bits on some 32-bit powerpc platforms. This fixes it by always using a u64 which is what is returned by the OF parsing routines. It also makes translation failure harmless for ISA serial ports. If they can't translate, we can't use the UART early, but we can still let the 8250 driver use it later on by using IO port accessors. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] Add new interrupt mapping core and change platforms to use itBenjamin Herrenschmidt2006-07-031-24/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds the new irq remapper core and removes the old one. Because there are some fundamental conflicts with the old code, like the value of NO_IRQ which I'm now setting to 0 (as per discussions with Linus), etc..., this commit also changes the relevant platform and driver code over to use the new remapper (so as not to cause difficulties later in bisecting). This patch removes the old pre-parsing of the open firmware interrupt tree along with all the bogus assumptions it made to try to renumber interrupts according to the platform. This is all to be handled by the new code now. For the pSeries XICS interrupt controller, a single remapper host is created for the whole machine regardless of how many interrupt presentation and source controllers are found, and it's set to match any device node that isn't a 8259. That works fine on pSeries and avoids having to deal with some of the complexities of split source controllers vs. presentation controllers in the pSeries device trees. The powerpc i8259 PIC driver now always requests the legacy interrupt range. It also has the feature of being able to match any device node (including NULL) if passed no device node as an input. That will help porting over platforms with broken device-trees like Pegasos who don't have a proper interrupt tree. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [POWERPC] Fix error handling in detecting legacy serial portsBenjamin Herrenschmidt2006-07-031-1/+12
| | | | | | | | Previously we weren't checking for failures in translating device addresses from the firmware. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* Remove obsolete #include <linux/config.h>Jörn Engel2006-06-301-1/+0
| | | | | Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
* [POWERPC] Add general support for mpc7448hpc2 (Taiga) platformZang Roy-r619112006-06-291-0/+11
| | | | | | | Add support for Freescale mpc7448 (Taiga) board support Signed-off-by: Roy Zang <tie-fei.zang@freescale.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: legacy_serial loop cleanupMichael Neuling2006-03-271-19/+19
| | | | | | | | We only ever execute the loop once, so let's move it to a function making it more readable. Cleanup patch, no functional change. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: fix various sparse warningsStephen Rothwell2006-03-271-2/+2
| | | | | Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] CONFIG_ISA does not make sense for CONFIG_PPC_PSERIESOlaf Hering2006-02-011-4/+0
| | | | | | | | | | | | Older pSeries systems with serial ports dont get any console output after recent changes. CONFIG_ISA does not make sense for CONFIG_PPC_PSERIES because it enables lots of old drivers. Instead, remove the dependency on CONFIG_ISA from the serial port discovery code. Signed-off-by: Olaf Hering <olh@suse.de> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] powerpc: fixing compile issue with !CONFIG_PCI in legacy_serial.cKumar Gala2006-01-091-1/+11
| | | | | | | | | Only build in support for ISA and PCI cases if we have enabled CONFIG_ISA and CONFIG_PCI. Additionally, isa_bridge is a global so we shouldn't use it a parameter name since it gets redefined to NULL when !CONFIG_PCI. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Add the ability to handle SOC ports in legacy_serialKumar Gala2006-01-091-10/+52
| | | | | | | | | Add the ability to configure and initialize legacy 8250 serials ports on an SOC bus. Also, fixed an issue that we would not configure any serial ports if "linux,stdout-path" was not found. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Update OF address parsersBenjamin Herrenschmidt2006-01-091-2/+3
| | | | | | | | | | | This updates the OF address parsers to return the IO flags indicating the type of address obtained. It also adds a PCI call for converting physical addresses that hit IO space into into IO tokens, and add routines that return the translated addresses into struct resource Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: More serial probe fixes (#2)Benjamin Herrenschmidt2006-01-091-11/+34
| | | | | | | | This fixes the new serial probe code with some PCI MMIO UARTs, and fixes CHRP build with ARCH=powerpc. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: serial port discovery: cope with broken firmwareDavid Woodhouse2006-01-091-1/+4
| | | | | | | | | | | | | | | On Tue, 2005-11-22 at 15:49 +1100, Benjamin Herrenschmidt wrote: > This moves the discovery of legacy serial ports to a separate file, > makes it common to ppc32 and ppc64, and reworks it to use the new OF > address translators to get to the ports early. This new version can also > detect some PCI serial cards using legacy chips and will probably match > those discovered port with the default console choice. This makes it deal with the fact that the Pegasos firmware reports that its clock frequency is zero... Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: serial port discovery (#2)Benjamin Herrenschmidt2006-01-091-0/+478
This moves the discovery of legacy serial ports to a separate file, makes it common to ppc32 and ppc64, and reworks it to use the new OF address translators to get to the ports early. This new version can also detect some PCI serial cards using legacy chips and will probably match those discovered port with the default console choice. Only ppc64 gets udbg still yet, unifying udbg isn't finished yet. It also adds some speed-probing code to udbg so that the default console can come up at the same speed it was set to by the firmware. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
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