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path: root/drivers/tty/serial/pch_uart.c
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* pch_uart: Fix dma channel unallocated issueTomoya MORINAGA2012-04-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | commit af6d17cdc8c89aeb3101f0d27cd32fc0592b40b2 upstream. This driver anticipates pch_uart_verify_port() is not called during installation. However, actually pch_uart_verify_port() is called during installation. As a result, memory access violation occurs like below. 0. initial value: use_dma=0 1. starup() - dma channel is not allocated because use_dma=0 2. pch_uart_verify_port() - Set use_dma=1 3. UART processing acts DMA mode because use_dma=1 - memory access violation occurs! This patch fixes the issue. Solution: Whenever pch_uart_verify_port() is called and then dma channel is not allocated, the channel should be allocated. Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* pch_uart: Set PCIe bus number using probe parameterTomoya MORINAGA2012-04-22
| | | | | | | | | | | | | commit 6c4b47d243112e98811ce0da7bbb32cc3857dd1a upstream. Currently, PCIe bus number is set as fixed value "2". However, PCIe bus number is not always "2". This patch sets bus number using probe() parameter. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* pch_uart: Support new device LAPIS Semiconductor ML7831 IOHTomoya MORINAGA2011-11-26
| | | | | | | | | | | commit 8249f743f732ccbc3056428945ab1d9bd36d46bf upstream. ML7831 is companion chip for Intel Atom E6xx series. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.lapis-semi.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* pch_uart: Fix DMA resource leak issueTomoya MORINAGA2011-11-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit 90f04c2926cfb5bf74533b0a7766bc896f6a0c0e upstream. Changing UART mode PIO->DMA->PIO->DMA like below, pch_uart driver can't get DMA channel resource. setserial /dev/ttyPCH0 ^low_latency setserial /dev/ttyPCH0 low_latency CAUSE: Changing mode using setserial command, ".startup" function which gets DMA channel is called before ".verify_port" function which sets dma-flag(use_dma/use_dma_flag) as 1. PIO->DMA .startup: Since dma-flag is 0, DMA channel is not requested. .verify_port: dma-flag is set as 1. .shutdown: N/A DMA->PIO .startup: Since dma-flag is 1, DMA channel is requested. .verify_port: dma-flag is set as 0. .shutdown: Since dma-flag is 0, DMA channel is not released. This means DMA channel resource leak occurs. Next time, this driver can't get DMA channel resource forever. MODIFICATION: Currently, when release DMA channel resource, this driver checks dma-flag. However, this specification occurs the above issue. This driver must check whether dma_request_channel is executed or not. The values are saved in private data variable "chan_tx/chan_tx". These variables mean if the value is NULL, DMA channel is not requested, if not NULL, DMA channel is requested. This patch fixes the issue. Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* pch_uart: Fix hw-flow control issueTomoya MORINAGA2011-11-26
| | | | | | | | | | | | | commit a1d7cfe29f13cf45f8094929864b9c66bf0cd91b upstream. Using hardware flow control, currently, register of the control-bit(AFE) is not set. This patch fixes the issue. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.lapis-semi.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* drivers/tty/serial/pch_uart.c: don't oops if dmi_get_system_info returns NULLAlexander Stein2011-06-15
| | | | | | | | | | | | | | If dmi_get_system_info() returns NULL, pch_uart_init_port() will dereferencea a zero pointer. This oops was observed on an Atom based board which has no BIOS, but a bootloder which doesn't provide DMI data. Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Cc: Greg KH <gregkh@suse.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/tty/serial/pch_uart.c needs slab.hAndrew Morton2011-05-25
| | | | | | | | | | | | | | | alpha allmodconfig: drivers/tty/serial/pch_uart.c: In function 'dma_handle_tx': drivers/tty/serial/pch_uart.c:873: error: implicit declaration of function 'kzalloc' drivers/tty/serial/pch_uart.c:873: warning: assignment makes pointer from integer without a cast drivers/tty/serial/pch_uart.c: In function 'pch_uart_init_port': drivers/tty/serial/pch_uart.c:1403: warning: assignment makes pointer from integer without a cast Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* pch_uart: Support new device ML7223 IOHTomoya MORINAGA2011-05-10
| | | | | | | | | | | Support new device OKI SEMICONDUCTOR ML7223 IOH(Input/Output Hub). The ML7223 IOH is for MP(Media Phone) use. The ML7223 is companion chip for Intel Atom E6xx series. The ML7223 is completely compatible for Intel EG20T PCH. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Merge branch 'for-linus' of ↵Linus Torvalds2011-03-18
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (47 commits) doc: CONFIG_UNEVICTABLE_LRU doesn't exist anymore Update cpuset info & webiste for cgroups dcdbas: force SMI to happen when expected arch/arm/Kconfig: remove one to many l's in the word. asm-generic/user.h: Fix spelling in comment drm: fix printk typo 'sracth' Remove one to many n's in a word Documentation/filesystems/romfs.txt: fixing link to genromfs drivers:scsi Change printk typo initate -> initiate serial, pch uart: Remove duplicate inclusion of linux/pci.h header fs/eventpoll.c: fix spelling mm: Fix out-of-date comments which refers non-existent functions drm: Fix printk typo 'failled' coh901318.c: Change initate to initiate. mbox-db5500.c Change initate to initiate. edac: correct i82975x error-info reported edac: correct i82975x mci initialisation edac: correct commented info fs: update comments to point correct document target: remove duplicate include of target/target_core_device.h from drivers/target/target_core_hba.c ... Trivial conflict in fs/eventpoll.c (spelling vs addition)
| * serial, pch uart: Remove duplicate inclusion of linux/pci.h headerJesper Juhl2011-02-17
| | | | | | | | | | | | | | Only include linux/pci.h once in drivers/tty/serial/pch_uart.c Signed-off-by: Jesper Juhl <jj@chaosbits.net> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | pch_uart: reference clock on CM-iTCDenis Turischev2011-03-14
| | | | | | | | | | | | | | | | | | | | | | | | | | Default clock source for UARTs on Topcliff is external UART_CLK. On CM-iTC USB_48MHz is used instead. After VCO2PLL and DIV manipulations UARTs will receive 192 MHz. Clock manipulations on Topcliff are controlled in pch_phub.c v2: redone against the linux-next tree v3: redone against linux/kernel/git/next/linux-next.git snapshot Signed-off-by: Denis Turischev <denis@compulab.co.il> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | pch_uart: Fix DMA channel miss-setting issue.Tomoya MORINAGA2011-02-22
| | | | | | | | | | Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | pch_uart: fix exclusive access issueTomoya MORINAGA2011-02-22
| | | | | | | | | | Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | pch_uart: fix auto flow control miss-setting issueTomoya MORINAGA2011-02-22
| | | | | | | | | | | | | | | | Currently, auto-flow control setting processing is not set correctly. This patch fixes the issue. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | pch_uart: fix uart clock setting issueTomoya MORINAGA2011-02-22
| | | | | | | | | | | | | | | | Currently, uart clock is not set correctly. This patch fixes the issue. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | pch_uart : Use dev_xxx not pr_xxxTomoya MORINAGA2011-02-22
| | | | | | | | | | | | | | | | For easy to understad which port the message is out, replace pr_xxx with dev_xxx. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | pch_uart : Reduce memcpyTomoya MORINAGA2011-02-22
| | | | | | | | | | | | | | Reduce memcpy for performance improvement. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | pch_uart: add spin_lock_initTomoya MORINAGA2011-02-22
| | | | | | | | | | | | | | | | Currently, spin_lock is not initialized. Thus, add spin_lock_init(). Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | pch_uart: add multi-scatter processingTomoya MORINAGA2011-02-22
| | | | | | | | | | | | | | | | | | | | Currently, this driver can handle only single scatterlist. Thus, it can't send data beyond FIFO size. This patch enables this driver can handle multiple scatter list. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | serial: pch_uart: support new device ML7213Tomoya MORINAGA2011-02-03
|/ | | | | | | | | Support ML7213 device of OKI SEMICONDUCTOR. ML7213 is companion chip of Intel Atom E6xx series for IVI(In-Vehicle Infotainment). ML7213 is completely compatible for Intel EG20T PCH. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* tty: move drivers/serial/ to drivers/tty/serial/Greg Kroah-Hartman2011-01-13
The serial drivers are really just tty drivers, so move them to drivers/tty/ to make things a bit neater overall. This is part of the tty/serial driver movement proceedure as proposed by Arnd Bergmann and approved by everyone involved a number of months ago. Cc: Arnd Bergmann <arnd@arndb.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Rogier Wolff <R.E.Wolff@bitwizard.nl> Cc: Michael H. Warfield <mhw@wittsend.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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