I'm working on an MPC52xx SPI device driver using one of the PSC.
However, when I call driver_register() I get a failure (-17, EEXISTS)
with a traceback (posted below).
I've tracked it down to failing when trying to create a sysfs entry
for the driver. It fails because sysfs tries to create a directory
that already exists (mpc52xx_psc). The directory was already created
when the psc serial port device driver was registered.
>From what I can tell, I should be able to register more than one
driver for a particular device name (mpc52xx_psc). Otherwise I would
need to change arch/ppc/syslib/mpc52xx_devices.c to have a different
name for each psc. If I change the sysfs code to ignore the failure
to create a directory then the driver seems to register fine.
I've attached a simple patch that reproduces the problem with stock
linux-2.6.12-rc6. Am I doing something wrong here or is this a bug in
the sysfs code for the platform bus?
Thanks in advance,
g.
----------------------------------------------------------
Patch follows:
----------------------------------------------------------
diff -ruN linux-2.6.11.orig/.config linux-2.6.11/.config
--- linux-2.6.11.orig/.config 2005-06-08 17:22:48.000000000 -0600
+++ linux-2.6.11/.config 2005-06-08 17:29:56.000000000 -0600
@@ -1,7 +1,7 @@
#
# Automatically generated make config: don't edit
# Linux kernel version: 2.6.12-rc6
-# Wed Jun 8 17:22:48 2005
+# Wed Jun 8 17:29:56 2005
#
CONFIG_MMU=y
CONFIG_GENERIC_HARDIRQS=y
@@ -460,6 +460,12 @@
# CONFIG_INFINIBAND is not set
#
+# SPI support
+#
+CONFIG_SPI=y
+CONFIG_SPI_MPC52XX_PSC=y
+
+#
# File systems
#
# CONFIG_EXT2_FS is not set
diff -ruN linux-2.6.11.orig/.config.old linux-2.6.11/.config.old
--- linux-2.6.11.orig/.config.old 2005-06-08 17:22:31.000000000 -0600
+++ linux-2.6.11/.config.old 2005-06-08 17:22:48.000000000 -0600
@@ -1,7 +1,7 @@
#
# Automatically generated make config: don't edit
-# Linux kernel version: 2.6.12-rc2
-# Thu May 19 12:30:43 2005
+# Linux kernel version: 2.6.12-rc6
+# Wed Jun 8 17:22:48 2005
#
CONFIG_MMU=y
CONFIG_GENERIC_HARDIRQS=y
@@ -11,6 +11,7 @@
CONFIG_PPC=y
CONFIG_PPC32=y
CONFIG_GENERIC_NVRAM=y
+CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
#
# Code maturity level options
@@ -35,6 +36,8 @@
CONFIG_KALLSYMS=y
# CONFIG_KALLSYMS_ALL is not set
# CONFIG_KALLSYMS_EXTRA_PASS is not set
+CONFIG_PRINTK=y
+CONFIG_BUG=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
@@ -62,6 +65,7 @@
# CONFIG_POWER4 is not set
# CONFIG_8xx is not set
# CONFIG_E500 is not set
+CONFIG_PPC_FPU=y
# CONFIG_ALTIVEC is not set
# CONFIG_TAU is not set
# CONFIG_CPU_FREQ is not set
@@ -110,6 +114,7 @@
CONFIG_BINFMT_ELF=y
# CONFIG_BINFMT_MISC is not set
# CONFIG_CMDLINE_BOOL is not set
+CONFIG_ISA_DMA_API=y
#
# Bus options
@@ -347,7 +352,6 @@
# CONFIG_SERIO_LIBPS2 is not set
# CONFIG_SERIO_RAW is not set
# CONFIG_GAMEPORT is not set
-CONFIG_SOUND_GAMEPORT=y
#
# Character devices
diff -ruN linux-2.6.11.orig/.version linux-2.6.11/.version
--- linux-2.6.11.orig/.version 2005-06-08 17:24:33.000000000 -0600
+++ linux-2.6.11/.version 2005-06-08 17:30:04.000000000 -0600
@@ -1 +1 @@
-1
+2
Files linux-2.6.11.orig/arch/ppc/boot/images/uImage and
linux-2.6.11/arch/ppc/boot/images/uImage differ
Files linux-2.6.11.orig/arch/ppc/boot/images/vmlinux.bin and
linux-2.6.11/arch/ppc/boot/images/vmlinux.bin differ
Files linux-2.6.11.orig/arch/ppc/boot/images/vmlinux.gz and
linux-2.6.11/arch/ppc/boot/images/vmlinux.gz differ
diff -ruN linux-2.6.11.orig/drivers/Kconfig linux-2.6.11/drivers/Kconfig
--- linux-2.6.11.orig/drivers/Kconfig 2005-03-02 00:38:26.000000000 -0700
+++ linux-2.6.11/drivers/Kconfig 2005-06-08 17:27:23.000000000 -0600
@@ -58,4 +58,6 @@
source "drivers/infiniband/Kconfig"
+source "drivers/spi/Kconfig"
+
endmenu
diff -ruN linux-2.6.11.orig/drivers/Makefile linux-2.6.11/drivers/Makefile
--- linux-2.6.11.orig/drivers/Makefile 2005-06-08 17:22:08.000000000 -0600
+++ linux-2.6.11/drivers/Makefile 2005-06-08 17:27:13.000000000 -0600
@@ -64,3 +64,4 @@
obj-$(CONFIG_BLK_DEV_SGIIOC4) += sn/
obj-y += firmware/
obj-$(CONFIG_CRYPTO) += crypto/
+obj-$(CONFIG_SPI) += spi/
diff -ruN linux-2.6.11.orig/drivers/spi/Kconfig
linux-2.6.11/drivers/spi/Kconfig---
linux-2.6.11.orig/drivers/spi/Kconfig 1969-12-31
17:00:00.000000000 -0700
+++ linux-2.6.11/drivers/spi/Kconfig 2005-06-08 17:29:37.000000000 -0600
@@ -0,0 +1,19 @@
+#
+# Character device configuration
+#
+
+menu "SPI support"
+
+config SPI
+ tristate "SPI support"
+ ---help---
+ SPI is a serial bus protocol for connecting between ICs
+
+config SPI_MPC52XX_PSC
+ tristate "SPI bus via MPC5xxx PSC port"
+ depends on SPI
+ help
+ Say Y here if you want SPI via an MPC5xxx PSC port.
+
+endmenu
+
diff -ruN linux-2.6.11.orig/drivers/spi/Makefile
linux-2.6.11/drivers/spi/Makefile
--- linux-2.6.11.orig/drivers/spi/Makefile 1969-12-31
17:00:00.000000000 -0700
+++ linux-2.6.11/drivers/spi/Makefile 2005-06-08 17:29:17.000000000 -0600
@@ -0,0 +1,6 @@
+#
+# Makefile for the spi core.
+#
+
+obj-$(CONFIG_SPI_MPC52XX_PSC) += spi-mpc5xxx-psc.o
+
diff -ruN linux-2.6.11.orig/drivers/spi/spi-mpc5xxx-psc.c
linux-2.6.11/drivers/spi/spi-mpc5xxx-psc.c
--- linux-2.6.11.orig/drivers/spi/spi-mpc5xxx-psc.c 1969-12-31
17:00:00.000000000 -0700
+++ linux-2.6.11/drivers/spi/spi-mpc5xxx-psc.c 2005-06-08
17:29:07.000000000 -0600
@@ -0,0 +1,60 @@
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+
+#include <asm/mpc52xx.h>
+#include <asm/mpc52xx_psc.h>
+
+MODULE_LICENSE("Dual BSD/GPL");
+
+static int __devinit
+spi_mpc52xx_psc_probe(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ /*struct resource *res = pdev->resource;*/
+ int idx = pdev->id;
+
+ printk(KERN_ALERT "spi-mpc52xx-psc: probing idx=%i\n", idx);
+
+ if (!mpc52xx_match_psc_function(idx, "spi"))
+ {
+ printk(KERN_ALERT "function not matched!\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int
+spi_mpc52xx_psc_remove(struct device *dev)
+{
+ return 0;
+}
+
+static struct device_driver spi_mpc52xx_psc_platform_driver = {
+ .name = "mpc52xx-psc",
+ .bus = &platform_bus_type,
+ .probe = spi_mpc52xx_psc_probe,
+ .remove = spi_mpc52xx_psc_remove,
+};
+
+static int __init spi_mpc52xx_psc_init(void)
+{
+ int ret;
+
+ printk(KERN_ALERT "spi_mpc52xx_psc: initializing\n");
+
+ ret = driver_register(&spi_mpc52xx_psc_platform_driver);
+ return ret;
+}
+
+static void __exit spi_mpc52xx_psc_exit(void)
+{
+ driver_unregister(&spi_mpc52xx_psc_platform_driver);
+ printk(KERN_ALERT "spi_mpc52xx_psc: exiting\n");
+}
+
+module_init(spi_mpc52xx_psc_init);
+module_exit(spi_mpc52xx_psc_exit);
diff -ruN linux-2.6.11.orig/include/config/spi/mpc52xx/psc.h
linux-2.6.11/include/config/spi/mpc52xx/psc.h
--- linux-2.6.11.orig/include/config/spi/mpc52xx/psc.h 1969-12-31
17:00:00.000000000 -0700
+++ linux-2.6.11/include/config/spi/mpc52xx/psc.h 2005-06-08
17:29:56.000000000 -0600
@@ -0,0 +1 @@
+#define CONFIG_SPI_MPC52XX_PSC 1
diff -ruN linux-2.6.11.orig/include/config/spi.h
linux-2.6.11/include/config/spi.h
--- linux-2.6.11.orig/include/config/spi.h 1969-12-31
17:00:00.000000000 -0700
+++ linux-2.6.11/include/config/spi.h 2005-06-08 17:29:56.000000000 -0600
@@ -0,0 +1 @@
+#define CONFIG_SPI 1
diff -ruN linux-2.6.11.orig/include/linux/autoconf.h
linux-2.6.11/include/linux/autoconf.h
--- linux-2.6.11.orig/include/linux/autoconf.h 2005-06-08
17:22:48.000000000 -0600
+++ linux-2.6.11/include/linux/autoconf.h 2005-06-08
17:29:56.000000000 -0600
@@ -1,7 +1,7 @@
/*
* Automatically generated C config: don't edit
* Linux kernel version: 2.6.12-rc6
- * Wed Jun 8 17:22:48 2005
+ * Wed Jun 8 17:29:56 2005
*/
#define AUTOCONF_INCLUDED
#define CONFIG_MMU 1
@@ -461,6 +461,12 @@
#undef CONFIG_INFINIBAND
/*
+ * SPI support
+ */
+#define CONFIG_SPI 1
+#define CONFIG_SPI_MPC52XX_PSC 1
+
+/*
* File systems
*/
#undef CONFIG_EXT2_FS
----------------------------------------------------------
Boot log follows:
----------------------------------------------------------
## Booting image at 00100000 ...
Image Name: Linux-2.6.12-rc6-lite5200
Created: 2005-06-08 23:30:09 UTC
Image Type: PowerPC Linux Kernel Image (gzip compressed)
Data Size: 571225 Bytes = 557.8 kB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
Uncompressing Kernel Image ... OK
id mach(): done
MMU:enter
MMU:hw init
MMU:mapin
MMU:setio
MMU:exit
setup_arch: enter
setup_arch: bootmem
arch: exit
Linux version 2.6.12-rc6-lite5200 (glikely at trillian) (gcc version 3.4.3) #2
Wed
Jun 8 17:30:04 MDT 2005
Built 1 zonelists
Kernel command line: console=ttyS0,115200
mtdparts=phys_mapped_flash:14M(jffs2),1M(kernel),1M(boot)
root=/dev/mtdblock0 rootfstype=jffs2 rw
PID hash table entries: 512 (order: 9, 8192 bytes)
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 63616k available (908k kernel code, 256k data, 72k init, 0k highmem)
Mount-cache hash table entries: 512
Linux NoNET1.0 for Linux 2.6
PCI: Probing PCI hardware
JFFS2 version 2.2. (C) 2001-2003 Red Hat, Inc.
Serial: MPC52xx PSC driver
ttyS0 at MMIO 0xf0002000 (irq = 39) is a MPC52xx PSC
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
physmap flash device: 1000000 at ff000000
phys_mapped_flash: Found 1 x8 devices at 0x0 in 8-bit bank
phys_mapped_flash: Found 1 x8 devices at 0x800000 in 8-bit bank
Amd/Fujitsu Extended Query Table at 0x0040
phys_mapped_flash: CFI does not contain boot bank location. Assuming top.
number of CFI chips: 2
cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.
3 cmdlinepart partitions found on MTD device phys_mapped_flash
Creating 3 MTD partitions on "phys_mapped_flash":
0x00000000-0x00e00000 : "jffs2"
0x00e00000-0x00f00000 : "kernel"
0x00f00000-0x01000000 : "boot"
mice: PS/2 mouse device common for all mice
spi_mpc52xx_psc: initializing
kobject_register failed for mpc52xx-psc (-17)
Call trace:
[c0099128] kobject_register+0x60/0x78
[c00bc5ac] bus_add_driver+0x78/0x178
[c00bccc8] driver_register+0x30/0x40
[c0125b90] spi_mpc52xx_psc_init+0x24/0x34
[c0003944] init+0x7c/0x22c
[c0006a04] kernel_thread+0x44/0x60
VFS: Mounted root (jffs2 filesystem).
Freeing unused kernel memory: 72k init
ifconfig: socket: Function not implemented
route: socket: Function not implemented
/etc/rcS: 7: /usr/sbin/telnetd: not f\uffff
BusyBox v1.00 (2005.05.19-06:22+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.
/ #
