- kernelnewbies@kernelnewbies.org - Kernelnewbies Mailing Lists

Re: DTS: clock not found
by Matthias Brugger Feb. 7, 2014

Feb. 7, 2014

Hi Javier, 2014-02-06 Javier Martinez Canillas <martinez.javier(a)gmail.com>: > Hello Matthias, > > On Wed, Feb 5, 2014 at 6:02 PM, Matthias Brugger <matthias.bgg(a)gmail.com> wrote: >> Hi, >> >> I'm stuck with dts problem. Whenever I try to find a clock for my >> device, the of_get_clk returns an error "Kernel panic - not syncing: >> Can't get timer clock" >> >> My DTS looks like this (reduced to relevant parts for easier reading): >> > > Could you give more details about your platform? > > I would take a look to Documentation/devicetree/bindings/clock/<your > platform>-clock.txt to be sure that you are using the bindings > correctly. > This is part of some effort to port Linux to a new SoC, so no documentation up to now... Anyway I found the error. I forgot to add my SoC to arch/arm/Makefile so that my SoC specific init funtion weren't called. So my device tree wasn't populated and therefore the clock had no properties. >> #include <dt-bindings/interrupt-controller/irq.h> >> #include <dt-bindings/interrupt-controller/arm-gic.h> >> #include "skeleton.dtsi" >> >> / { >> >> [...] >> >> soc { >> #address-cells = <1>; >> #size-cells = <1>; >> compatible = "simple-bus"; >> ranges; >> >> gic: interrupt-controller@10212000 { >> compatible = "arm,cortex-a9-gic"; >> interrupt-controller; >> #interrupt-cells = <3>; >> reg = <0x10211000 0x1000>, >> <0x10212000 0x1000>; >> }; >> >> osc: oscillator { >> compatible = "fixed-clock"; >> #clock-cells = <1>; > > Looking at Documentation/devicetree/bindings/clock/fixed-clock.txt it says: > > #clock-cells : from common clock binding; shall be set to 0 Yes, you are right. > > while your are setting your clock-cells to 1. > >> clock-frequency = <15000000>; >> clock-output-names = "osc"; >> }; >> >> timer: timer-mysoc { >> compatible = "mysoc,mysoc-timer"; >> reg = <0x10008000 0x30>; >> interrupts = <GIC_SPI 113 IRQ_TYPE_EDGE_RISING>; >> clocks = <&osc 0>; >> clock-names = "system15m"; >> }; >> }; > > Documentation/devicetree/bindings/clock/clock-bindings.txt also says: > > ==Clock consumers== > > Required properties: > clocks: List of phandle and clock specifier pairs, one pair > for each clock input to the device. Note: if the > clock provider specifies '0' for #clock-cells, then > only the phandle portion of the pair will appear. > > So my educated guess is that you should use #clock-cells = <0>; your > your clock provider device node and clocks = <&osc> on your clock > consumer device node. Thats true. > > By looking at DTS and DTSI that uses the fixed-clock binding I see > that all platforms don't have their clocks providers device nodes > under soc {} but on a separate clocks {} node. I didn't find on the > clock-bindings.txt DT bindings documentation that this is a > requirement so probably that is not issue in your case but still > something to keep in mind. > The code I posted is nearly similar to the example in Documentation/devicetree/bindings/clock/clock-bindings.txt. Anyway it seems that of_clk_get searches for the "#clock-cells" cells in the list "clocks". I suppose that the "clocks" list is populated by the node present under clocks {}. Thanks a lot for your hints. Matthias >> }; >> >> >> my /drivers/clocksource/mysoc-timer.c looks like this (reduced to >> relevant parts for easier reading): >> >> [...] >> >> static void __init mysoc_timer_init(struct device_node *node) >> { >> unsigned long rate = 0; >> struct clk *clk; >> int ret, irq; >> u32 val; >> >> gpt_base = of_iomap(node, 0); >> if (!gpt_base) >> panic("Can't map registers"); >> >> irq = irq_of_parse_and_map(node, 0); >> if (irq <= 0) >> panic("Can't parse IRQ"); >> >> clk = of_clk_get(node, 0); >> if (IS_ERR(clk)) >> panic("Can't get timer clock"); >> clk_prepare_enable(clk); >> >> rate = clk_get_rate(clk); >> >> } >> CLOCKSOURCE_OF_DECLARE(mtk_mt6589, "mysoc,mysoc-timer", >> mysoc_timer_init); >> >> >> What I'm missing? I seems as if the clock "osc" is not found in the >> device tree. Any idea why. Building the DTB works without errors, but >> I suppose that doesn't mean too much anyway. >> >> Cheers, >> Matthias >> >> -- >> motzblog.wordpress.com > > Hope it helps, > > Javier -- motzblog.wordpress.com

1 0

QorIQ P1020 dual core - driver initialization duplication
by Maxime Moge Feb. 7, 2014

Feb. 7, 2014

Hi guys, I m struggling to get rid of double kernel log while the kernel is booting. Here a part of the kernel messages: WARNING: adjusting available memory to 30000000 ## Booting kernel from Legacy Image at 01000000 ... Image Name: Linux-3.0.34-rt55-02405-ge33c5eb Created: 2014-02-06 8:45:28 UTC Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2559447 Bytes = 2.4 MiB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK ## Loading init Ramdisk from Legacy Image at 02000000 ... Image Name: Myrootfs Created: 2014-02-06 8:37:18 UTC Image Type: PowerPC Linux RAMDisk Image (gzip compressed) Data Size: 27623382 Bytes = 26.3 MiB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK ## Flattened Device Tree blob at 00c00000 Booting using the fdt blob at 0x00c00000 Uncompressing Kernel Image ... OK Loading Ramdisk to 2e5a8000, end 2fffffd6 ... OK Loading Device Tree to 03ffb000, end 03ffff85 ... OK WARNING: could not find compatible node fsl-usb2-mph or fsl-usb2-dr: FDT_ERR_NOTFOUND. WARNING: could not find compatible nodefsl-usb2-dr: FDT_ERR_NOTFOUND. [ 0.000000] Using P1021 RDB-PC machine description [ 0.000000] Memory CAM mapping: 1024 Mb, residual: 0Mb [ 0.000000] Linux version 3.0.34-rt55-02405-ge33c5eb-dirty (freescale@freescale-sdk) (gcc version 4.7.2 (GCC) ) #369 SMP PREEMPT RT Thu Feb 6 16:44:45 CST 2014 [ 0.000000] CPU maps initialized for 1 thread per core setup_arch: bootmem mpc85xx_rdb_setup_arch() arch: exit [ 0.000000] MPC85xx RDB board from Freescale Semiconductor [ 0.000000] MMU: Allocated 1088 bytes of context maps for 255 contexts [ 0.000000] PERCPU: Embedded 7 pages/cpu @80d13000 s5536 r8192 d14944 u32768 [ 0.000000] Kernel command line: root=/dev/ram rw console=ttyS0,115200 ramdisk_size=120000 [ 0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes) [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) [ 0.000000] Memory: 1007244k/1048576k available (4840k kernel code, 41332k reserved, 184k data, 118k bss, 212k init) [ 0.000000] Kernel virtual memory layout: [ 0.000000] * 0xfffdf000..0xfffff000 : fixmap [ 0.000000] * 0xfdffe000..0xfe000000 : early ioremap [ 0.000000] * 0xc1000000..0xfdffe000 : vmalloc & ioremap [ 0.000000] Preemptible hierarchical RCU implementation. [ 0.000000] NR_IRQS:512 nr_irqs:512 16 [ 0.000000] mpic: Setting up MPIC " OpenPIC " version 1.2 at ffe40000, max 2 CPUs [ 0.000000] mpic: ISU size: 256, shift: 8, mask: ff [ 0.000000] mpic: Initializing for 256 sources [ 0.000000] clocksource: timebase mult[5000000] shift[22] registered [ 0.000000] Console: colour dummy device 80x25 [ 0.113973] pid_max: default: 32768 minimum: 301 [ 0.114260] Mount-cache hash table entries: 512 [ 0.116845] mpic: requesting IPIs... [ 0.116962] e500 family performance monitor hardware support registered [ 0.299317] Brought up 2 CPUs [ 0.301369] NET: Registered protocol family 16 [ 0.305380] No RSTCR register, warm reboot won't work [ 0.305748] /soc@ffe00000/gpio-controller@f000: registered as generic GPIO chip, base is 0x000000e0 [ 0.326128] bio: create slab <bio-0> at 0 [ 0.328607] SCSI subsystem initialized [ 0.333035] Switching to clocksource timebase [ 0.335427] Switched to NOHz mode on CPU #1 [ 0.335436] Switched to NOHz mode on CPU #0 [ 0.356165] NET: Registered protocol family 2 [ 0.356590] IP route cache hash table entries: 32768 (order: 5, 131072 bytes) [ 0.358539] TCP established hash table entries: 131072 (order: 8, 1048576 bytes) [ 0.361071] TCP bind hash table entries: 65536 (order: 9, 2097152 bytes) [ 0.366245] TCP: Hash tables configured (established 131072 bind 65536) [ 0.366255] TCP reno registered [ 0.366287] UDP hash table entries: 512 (order: 3, 40960 bytes) [ 0.366394] UDP-Lite hash table entries: 512 (order: 3, 40960 bytes) [ 0.366976] NET: Registered protocol family 1 [ 0.367316] Trying to unpack rootfs image as initramfs... [ 0.368051] rootfs image is not initramfs (no cpio magic); looks like an initrd [ 0.469005] Freeing initrd memory: 26976k freed [ 0.487340] Freescale PowerQUICC MII Bus: probed [ 0.487980] mdio_bus mdio@ffe24000: error probing PHY at address 0 [ 0.489284] mdio_bus mdio@ffe24000: error probing PHY at address 17 [ 0.489913] mdio_bus mdio@ffe24000: error probing PHY at address 2 [ 0.490583] Freescale PowerQUICC MII Bus: probed [ 0.494156] fsl-l2ctlr ffe20000.l2-cache-controller: Entire L2 as cache, provide valid sram address and size [ 0.494180] fsl-l2ctlr: probe of ffe20000.l2-cache-controller failed with error -22 [ 0.497185] Freescale PMC driver [ 0.498443] audit: initializing netlink socket (disabled) [ 0.498506] type=2000 audit(0.468:1): initialized [ 0.511598] NTFS driver 2.1.30 [Flags: R/O]. [ 0.511820] msgmni has been set to 2019 [ 0.513589] io scheduler noop registered [ 0.513598] io scheduler deadline registered [ 0.513718] io scheduler cfq registered (default) [ 0.000000] Using P1021 RDB-PC machine description [ 0.000000] Memory CAM mapping: 1024 Mb, residual: 0Mb [ 0.000000] Linux version 3.0.34-rt55-02405-ge33c5eb-dirty (freescale@freescale-sdk) (gcc version 4.7.2 (GCC) ) #369 SMP PREEMPT RT Thu Feb 6 16:44:45 CST 2014 [ 0.000000] CPU maps initialized for 1 thread per core [ 0.000000] MPC85xx RDB board from Freescale Semiconductor [ 0.000000] MMU: Allocated 1088 bytes of context maps for 255 contexts [ 0.000000] PERCPU: Embedded 7 pages/cpu @80d13000 s5536 r8192 d14944 u32768 [ 0.000000] Kernel command line: root=/dev/ram rw console=ttyS0,115200 ramdisk_size=120000 [ 0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes) [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) [ 0.000000] Memory: 1007244k/1048576k available (4840k kernel code, 41332k reserved, 184k data, 118k bss, 212k init) [ 0.000000] Kernel virtual memory layout: [ 0.000000] * 0xfffdf000..0xfffff000 : fixmap [ 0.000000] * 0xfdffe000..0xfe000000 : early ioremap [ 0.000000] * 0xc1000000..0xfdffe000 : vmalloc & ioremap [ 0.000000] Preemptible hierarchical RCU implementation. [ 0.000000] NR_IRQS:512 nr_irqs:512 16 [ 0.000000] mpic: Setting up MPIC " OpenPIC " version 1.2 at ffe40000, max 2 CPUs [ 0.000000] mpic: ISU size: 256, shift: 8, mask: ff [ 0.000000] mpic: Initializing for 256 sources [ 0.000000] clocksource: timebase mult[5000000] shift[22] registered [ 0.000000] Console: colour dummy device 80x25 [ 0.113973] pid_max: default: 32768 minimum: 301 [ 0.114260] Mount-cache hash table entries: 512 [ 0.116845] mpic: requesting IPIs... [ 0.116962] e500 family performance monitor hardware support registered [ 0.299317] Brought up 2 CPUs [ 0.301369] NET: Registered protocol family 16 [ 0.305380] No RSTCR register, warm reboot won't work [ 0.305748] /soc@ffe00000/gpio-controller@f000: registered as generic GPIO chip, base is 0x000000e0 [ 0.326128] bio: create slab <bio-0> at 0 [ 0.328607] SCSI subsystem initialized [ 0.333035] Switching to clocksource timebase [ 0.335427] Switched to NOHz mode on CPU #1 [ 0.335436] Switched to NOHz mode on CPU #0 [ 0.356165] NET: Registered protocol family 2 [ 0.356590] IP route cache hash table entries: 32768 (order: 5, 131072 bytes) [ 0.358539] TCP established hash table entries: 131072 (order: 8, 1048576 bytes) [ 0.361071] TCP bind hash table entries: 65536 (order: 9, 2097152 bytes) [ 0.366245] TCP: Hash tables configured (established 131072 bind 65536) [ 0.366255] TCP reno registered [ 0.366287] UDP hash table entries: 512 (order: 3, 40960 bytes) [ 0.366394] UDP-Lite hash table entries: 512 (order: 3, 40960 bytes) [ 0.366976] NET: Registered protocol family 1 [ 0.367316] Trying to unpack rootfs image as initramfs... [ 0.368051] rootfs image is not initramfs (no cpio magic); looks like an initrd [ 0.469005] Freeing initrd memory: 26976k freed [ 0.487340] Freescale PowerQUICC MII Bus: probed [ 0.487980] mdio_bus mdio@ffe24000: error probing PHY at address 0 [ 0.489284] mdio_bus mdio@ffe24000: error probing PHY at address 17 [ 0.489913] mdio_bus mdio@ffe24000: error probing PHY at address 2 [ 0.490583] Freescale PowerQUICC MII Bus: probed [ 0.494156] fsl-l2ctlr ffe20000.l2-cache-controller: Entire L2 as cache, provide valid sram address and size [ 0.494180] fsl-l2ctlr: probe of ffe20000.l2-cache-controller failed with error -22 [ 0.497185] Freescale PMC driver [ 0.498443] audit: initializing netlink socket (disabled) [ 0.498506] type=2000 audit(0.468:1): initialized [ 0.511598] NTFS driver 2.1.30 [Flags: R/O]. [ 0.511820] msgmni has been set to 2019 [ 0.513589] io scheduler noop registered [ 0.513598] io scheduler deadline registered [ 0.513718] io scheduler cfq registered (default) [ 0.723505] Freescale DIU driver [ 0.951694] Serial: 8250/16550 driver, 2 ports, IRQ sharing enabled [ 0.974326] serial8250.0: ttyS0 at MMIO 0xffe04500 (irq = 42) is a 16550A [ 1.354250] serial8250.0: ttyS1 at MMIO 0xffe04600 (irq = 42) is a 16550A [ 1.354250] serial8250.0: ttyS1 at MMIO 0xffe04600 (irq = 42) is a 16550A [ 1.369442] Generic non-volatile memory driver v1.1 [ 1.369442] Generic non-volatile memory driver v1.1 [ 1.382020] brd: module loaded [ 1.382020] brd: module loaded [ 1.388215] loop: module loaded [ 1.388215] loop: module loaded [ 1.388225] st: Version 20101219, fixed bufsize 32768, s/g segs 256 [ 1.388225] st: Version 20101219, fixed bufsize 32768, s/g segs 256 [ 1.394798] m25p80 spi32766.0: s25fl129p1 (16384 Kbytes) [ 1.394798] m25p80 spi32766.0: s25fl129p1 (16384 Kbytes) [ 1.394817] Creating 2 MTD partitions on "spi32766.0": [ 1.394817] Creating 2 MTD partitions on "spi32766.0": [ 1.394831] 0x000000000000-0x000000500000 : "SPI Flash U-Boot Image" [ 1.394831] 0x000000000000-0x000000500000 : "SPI Flash U-Boot Image" [ 1.410261] ftl_cs: FTL header not found. [ 1.410261] ftl_cs: FTL header not found. [ 1.411378] 0x000000500000-0x000001000000 : "SPI Flash utilities" [ 1.411378] 0x000000500000-0x000001000000 : "SPI Flash utilities" Do you have any idea how to resolve this issue? How do I eventually configure the kernel in order to get it resolved? Thank you very much in advance SICK AG - Sitz: Waldkirch i. Br. - Handelsregister: Freiburg i. Br. HRB 280355 Vorstand: Dr. Robert Bauer (Vorsitzender) - Reinhard Bösl - Dr. Mats Gökstorp - Dr. Martin Krämer - Markus Vatter Aufsichtsrat: Gisela Sick (Ehrenvorsitzende) - Klaus M. Bukenberger (Vorsitzender)

2 1

Flush cache for memory allocated by kmalloc
by m silverstri Feb. 7, 2014

Feb. 7, 2014

Hi, I allocate memory in my driver and I passed this address to my HW register to write to. My question is when the HW done writing (my driver get notified by an interrupt). How can I flush the cache so that my driver can see what has been written by the HW? Thank you.

2 1

DTS: clock not found
by Matthias Brugger Feb. 6, 2014

Feb. 6, 2014

Hi, I'm stuck with dts problem. Whenever I try to find a clock for my device, the of_get_clk returns an error "Kernel panic - not syncing: Can't get timer clock" My DTS looks like this (reduced to relevant parts for easier reading): #include <dt-bindings/interrupt-controller/irq.h> #include <dt-bindings/interrupt-controller/arm-gic.h> #include "skeleton.dtsi" / { [...] soc { #address-cells = <1>; #size-cells = <1>; compatible = "simple-bus"; ranges; gic: interrupt-controller@10212000 { compatible = "arm,cortex-a9-gic"; interrupt-controller; #interrupt-cells = <3>; reg = <0x10211000 0x1000>, <0x10212000 0x1000>; }; osc: oscillator { compatible = "fixed-clock"; #clock-cells = <1>; clock-frequency = <15000000>; clock-output-names = "osc"; }; timer: timer-mysoc { compatible = "mysoc,mysoc-timer"; reg = <0x10008000 0x30>; interrupts = <GIC_SPI 113 IRQ_TYPE_EDGE_RISING>; clocks = <&osc 0>; clock-names = "system15m"; }; }; }; my /drivers/clocksource/mysoc-timer.c looks like this (reduced to relevant parts for easier reading): [...] static void __init mysoc_timer_init(struct device_node *node) { unsigned long rate = 0; struct clk *clk; int ret, irq; u32 val; gpt_base = of_iomap(node, 0); if (!gpt_base) panic("Can't map registers"); irq = irq_of_parse_and_map(node, 0); if (irq <= 0) panic("Can't parse IRQ"); clk = of_clk_get(node, 0); if (IS_ERR(clk)) panic("Can't get timer clock"); clk_prepare_enable(clk); rate = clk_get_rate(clk); } CLOCKSOURCE_OF_DECLARE(mtk_mt6589, "mysoc,mysoc-timer", mysoc_timer_init); What I'm missing? I seems as if the clock "osc" is not found in the device tree. Any idea why. Building the DTB works without errors, but I suppose that doesn't mean too much anyway. Cheers, Matthias -- motzblog.wordpress.com

2 1

How to allocate memory and get the physical address in kernel
by m silverstri Feb. 6, 2014

Feb. 6, 2014

Hi, I am developing a kernel driver. I need to allocate buffer in the kernel driver and pass the physical address of the buffer to the Chip register so that it can generate output there. I tried using kmalloc() but I don' get any output from the chip. Is there a better way to achieve what I want?

4 3

16-Byte aligned memory allocated in user space and then
by m silverstri Feb. 5, 2014

Feb. 5, 2014

Hi, If I allocated memory in user space and make it 16 byte aligned memory, and then pass it to kernel and setup DMA for my kernel driver, will my kernel driver still see the memory in 16-Byte aligned memory? The hard that my kernel driver takes to need 16-Byte aligned memory. Thank you.

2 1

How to map more than 1 page of buffer to kernel address?
by m silverstri Feb. 5, 2014

Feb. 5, 2014

Hi, I need to map an buffer object to kernel address. What should I buffer is more than 1 page and I want to map the whole buffer to the kernel address? https://www.kernel.org/doc/htmldocs/device-drivers/API-dma-buf-kmap.html dma_buf_kmap -- Map a page of the buffer object into kernel address space. The same restrictions as for kmap and friends apply. Thanks.

2 1

Where to find USB VID and PID?
by Eric Fowler Feb. 4, 2014

Feb. 4, 2014

I have an Emcraft SmartFusion2 board with a USB interface, running ucLinux. When I plug the board to a Windows machine, said Win machine sees an 'unknown device', which usually (always) means VID_0000 and PID_0000. This is separate and independent of the USB and JTAG interfaces that are used for programming, network access, and debugging, which are all working as expected. How do I: - Find the device on the linux side that maps to that endpoint, if it exists (I have already found the device object for the root hub) - Interrogate for the VID & PID that a given USB device presents to the connecting host - Manipulate the VID & PID on a USB device on ucLinux -- cc:NSA

2 1

GSoc
by David kiarie Feb. 4, 2014

Feb. 4, 2014

Hi everybody. I am College student and I happen to be following a couple of open-source mailing lists.I have noted that threads related to the GSoc projects have come up again. Now could anyone have any ideas on some nice GSoc Projects for Linux?

2 2

Question about using spinlock to synchronize between kernel driver and an interrupt handler
by m silverstri Feb. 4, 2014

Feb. 4, 2014

Hi, I read this article http://www.linuxjournal.com/article/5833 to learn about spinlock. I try this to use it in my kernel driver. Here is what my driver code needs to do: In f1(), it will get the spin lock, and caller can call f2() will wait for the lock since the spin lock is not being unlock. The spin lock will be unlock in my interrupt handler (triggered by the HW). void f1() { spin_lock(&mylock); // write hardware REG_ADDR += FLAG_A; } void f2() { spin_lock(&mylock); //... } The hardware will send the application an interrupt and my interrupt handler will call spin_unlock(&mylock); My question is if I call f1() f2() // i want this to block until the interrupt return saying setting REG_ADDR is done. when I run this, I get an exception in kernel saying a deadlock " INFO: possible recursive locking detected" How can I re-write my code so that kernel does not think I have a deadlock? I want my driver code to wait until HW sends me an interrupt saying setting REG_ADDR is done. Thank you.

5 15