linux/drivers/tc/tc.c

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/*
* TURBOchannel bus services.
*
* Copyright (c) Harald Koerfgen, 1998
TC: Set DMA masks for devices Fix a TURBOchannel support regression with commit 205e1b7f51e4 ("dma-mapping: warn when there is no coherent_dma_mask") that caused coherent DMA allocations to produce a warning such as: defxx: v1.11 2014/07/01 Lawrence V. Stefani and others tc1: DEFTA at MMIO addr = 0x1e900000, IRQ = 20, Hardware addr = 08-00-2b-a3-a3-29 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1 at ./include/linux/dma-mapping.h:516 dfx_dev_register+0x670/0x678 Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 4.19.0-rc6 #2 Stack : ffffffff8009ffc0 fffffffffffffec0 0000000000000000 ffffffff80647650 0000000000000000 0000000000000000 ffffffff806f5f80 ffffffffffffffff 0000000000000000 0000000000000000 0000000000000001 ffffffff8065d4e8 98000000031b6300 ffffffff80563478 ffffffff805685b0 ffffffffffffffff 0000000000000000 ffffffff805d6720 0000000000000204 ffffffff80388df8 0000000000000000 0000000000000009 ffffffff8053efd0 ffffffff806657d0 0000000000000000 ffffffff803177f8 0000000000000000 ffffffff806d0000 9800000003078000 980000000307b9e0 000000001e900000 ffffffff80067940 0000000000000000 ffffffff805d6720 0000000000000204 ffffffff80388df8 ffffffff805176c0 ffffffff8004dc78 0000000000000000 ffffffff80067940 ... Call Trace: [<ffffffff8004dc78>] show_stack+0xa0/0x130 [<ffffffff80067940>] __warn+0x128/0x170 ---[ end trace b1d1e094f67f3bb2 ]--- This is because the TURBOchannel bus driver fails to set the coherent DMA mask for devices enumerated. Set the regular and coherent DMA masks for TURBOchannel devices then, observing that the bus protocol supports a 34-bit (16GiB) DMA address space, by interpreting the value presented in the address cycle across the 32 `ad' lines as a 32-bit word rather than byte address[1]. The architectural size of the TURBOchannel DMA address space exceeds the maximum amount of RAM any actual TURBOchannel system in existence may have, hence both masks are the same. This removes the warning shown above. References: [1] "TURBOchannel Hardware Specification", EK-369AA-OD-007B, Digital Equipment Corporation, January 1993, Section "DMA", pp. 1-15 -- 1-17 Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Paul Burton <paul.burton@mips.com> Patchwork: https://patchwork.linux-mips.org/patch/20835/ Fixes: 205e1b7f51e4 ("dma-mapping: warn when there is no coherent_dma_mask") Cc: stable@vger.kernel.org # 4.16+ Cc: Ralf Baechle <ralf@linux-mips.org>
2018-10-03 14:21:07 +02:00
* Copyright (c) 2001, 2003, 2005, 2006, 2018 Maciej W. Rozycki
* Copyright (c) 2005 James Simmons
*
* This file is subject to the terms and conditions of the GNU
* General Public License. See the file "COPYING" in the main
* directory of this archive for more details.
*/
#include <linux/compiler.h>
TC: Set DMA masks for devices Fix a TURBOchannel support regression with commit 205e1b7f51e4 ("dma-mapping: warn when there is no coherent_dma_mask") that caused coherent DMA allocations to produce a warning such as: defxx: v1.11 2014/07/01 Lawrence V. Stefani and others tc1: DEFTA at MMIO addr = 0x1e900000, IRQ = 20, Hardware addr = 08-00-2b-a3-a3-29 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1 at ./include/linux/dma-mapping.h:516 dfx_dev_register+0x670/0x678 Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 4.19.0-rc6 #2 Stack : ffffffff8009ffc0 fffffffffffffec0 0000000000000000 ffffffff80647650 0000000000000000 0000000000000000 ffffffff806f5f80 ffffffffffffffff 0000000000000000 0000000000000000 0000000000000001 ffffffff8065d4e8 98000000031b6300 ffffffff80563478 ffffffff805685b0 ffffffffffffffff 0000000000000000 ffffffff805d6720 0000000000000204 ffffffff80388df8 0000000000000000 0000000000000009 ffffffff8053efd0 ffffffff806657d0 0000000000000000 ffffffff803177f8 0000000000000000 ffffffff806d0000 9800000003078000 980000000307b9e0 000000001e900000 ffffffff80067940 0000000000000000 ffffffff805d6720 0000000000000204 ffffffff80388df8 ffffffff805176c0 ffffffff8004dc78 0000000000000000 ffffffff80067940 ... Call Trace: [<ffffffff8004dc78>] show_stack+0xa0/0x130 [<ffffffff80067940>] __warn+0x128/0x170 ---[ end trace b1d1e094f67f3bb2 ]--- This is because the TURBOchannel bus driver fails to set the coherent DMA mask for devices enumerated. Set the regular and coherent DMA masks for TURBOchannel devices then, observing that the bus protocol supports a 34-bit (16GiB) DMA address space, by interpreting the value presented in the address cycle across the 32 `ad' lines as a 32-bit word rather than byte address[1]. The architectural size of the TURBOchannel DMA address space exceeds the maximum amount of RAM any actual TURBOchannel system in existence may have, hence both masks are the same. This removes the warning shown above. References: [1] "TURBOchannel Hardware Specification", EK-369AA-OD-007B, Digital Equipment Corporation, January 1993, Section "DMA", pp. 1-15 -- 1-17 Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Paul Burton <paul.burton@mips.com> Patchwork: https://patchwork.linux-mips.org/patch/20835/ Fixes: 205e1b7f51e4 ("dma-mapping: warn when there is no coherent_dma_mask") Cc: stable@vger.kernel.org # 4.16+ Cc: Ralf Baechle <ralf@linux-mips.org>
2018-10-03 14:21:07 +02:00
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tc.h>
#include <linux/types.h>
#include <asm/io.h>
static struct tc_bus tc_bus = {
.name = "TURBOchannel",
};
/*
* Probing for TURBOchannel modules.
*/
static void __init tc_bus_add_devices(struct tc_bus *tbus)
{
resource_size_t slotsize = tbus->info.slot_size << 20;
resource_size_t extslotsize = tbus->ext_slot_size;
resource_size_t slotaddr;
resource_size_t extslotaddr;
resource_size_t devsize;
void __iomem *module;
struct tc_dev *tdev;
int i, slot, err;
u8 pattern[4];
long offset;
for (slot = 0; slot < tbus->num_tcslots; slot++) {
slotaddr = tbus->slot_base + slot * slotsize;
extslotaddr = tbus->ext_slot_base + slot * extslotsize;
module = ioremap_nocache(slotaddr, slotsize);
BUG_ON(!module);
offset = TC_OLDCARD;
err = 0;
err |= tc_preadb(pattern + 0, module + offset + TC_PATTERN0);
err |= tc_preadb(pattern + 1, module + offset + TC_PATTERN1);
err |= tc_preadb(pattern + 2, module + offset + TC_PATTERN2);
err |= tc_preadb(pattern + 3, module + offset + TC_PATTERN3);
if (err)
goto out_err;
if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
pattern[2] != 0xaa || pattern[3] != 0xff) {
offset = TC_NEWCARD;
err = 0;
err |= tc_preadb(pattern + 0,
module + offset + TC_PATTERN0);
err |= tc_preadb(pattern + 1,
module + offset + TC_PATTERN1);
err |= tc_preadb(pattern + 2,
module + offset + TC_PATTERN2);
err |= tc_preadb(pattern + 3,
module + offset + TC_PATTERN3);
if (err)
goto out_err;
}
if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
pattern[2] != 0xaa || pattern[3] != 0xff)
goto out_err;
/* Found a board, allocate it an entry in the list */
tdev = kzalloc(sizeof(*tdev), GFP_KERNEL);
if (!tdev) {
pr_err("tc%x: unable to allocate tc_dev\n", slot);
goto out_err;
}
dev_set_name(&tdev->dev, "tc%x", slot);
tdev->bus = tbus;
tdev->dev.parent = &tbus->dev;
tdev->dev.bus = &tc_bus_type;
tdev->slot = slot;
TC: Set DMA masks for devices Fix a TURBOchannel support regression with commit 205e1b7f51e4 ("dma-mapping: warn when there is no coherent_dma_mask") that caused coherent DMA allocations to produce a warning such as: defxx: v1.11 2014/07/01 Lawrence V. Stefani and others tc1: DEFTA at MMIO addr = 0x1e900000, IRQ = 20, Hardware addr = 08-00-2b-a3-a3-29 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1 at ./include/linux/dma-mapping.h:516 dfx_dev_register+0x670/0x678 Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 4.19.0-rc6 #2 Stack : ffffffff8009ffc0 fffffffffffffec0 0000000000000000 ffffffff80647650 0000000000000000 0000000000000000 ffffffff806f5f80 ffffffffffffffff 0000000000000000 0000000000000000 0000000000000001 ffffffff8065d4e8 98000000031b6300 ffffffff80563478 ffffffff805685b0 ffffffffffffffff 0000000000000000 ffffffff805d6720 0000000000000204 ffffffff80388df8 0000000000000000 0000000000000009 ffffffff8053efd0 ffffffff806657d0 0000000000000000 ffffffff803177f8 0000000000000000 ffffffff806d0000 9800000003078000 980000000307b9e0 000000001e900000 ffffffff80067940 0000000000000000 ffffffff805d6720 0000000000000204 ffffffff80388df8 ffffffff805176c0 ffffffff8004dc78 0000000000000000 ffffffff80067940 ... Call Trace: [<ffffffff8004dc78>] show_stack+0xa0/0x130 [<ffffffff80067940>] __warn+0x128/0x170 ---[ end trace b1d1e094f67f3bb2 ]--- This is because the TURBOchannel bus driver fails to set the coherent DMA mask for devices enumerated. Set the regular and coherent DMA masks for TURBOchannel devices then, observing that the bus protocol supports a 34-bit (16GiB) DMA address space, by interpreting the value presented in the address cycle across the 32 `ad' lines as a 32-bit word rather than byte address[1]. The architectural size of the TURBOchannel DMA address space exceeds the maximum amount of RAM any actual TURBOchannel system in existence may have, hence both masks are the same. This removes the warning shown above. References: [1] "TURBOchannel Hardware Specification", EK-369AA-OD-007B, Digital Equipment Corporation, January 1993, Section "DMA", pp. 1-15 -- 1-17 Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Paul Burton <paul.burton@mips.com> Patchwork: https://patchwork.linux-mips.org/patch/20835/ Fixes: 205e1b7f51e4 ("dma-mapping: warn when there is no coherent_dma_mask") Cc: stable@vger.kernel.org # 4.16+ Cc: Ralf Baechle <ralf@linux-mips.org>
2018-10-03 14:21:07 +02:00
/* TURBOchannel has 34-bit DMA addressing (16GiB space). */
tdev->dma_mask = DMA_BIT_MASK(34);
tdev->dev.dma_mask = &tdev->dma_mask;
tdev->dev.coherent_dma_mask = DMA_BIT_MASK(34);
for (i = 0; i < 8; i++) {
tdev->firmware[i] =
readb(module + offset + TC_FIRM_VER + 4 * i);
tdev->vendor[i] =
readb(module + offset + TC_VENDOR + 4 * i);
tdev->name[i] =
readb(module + offset + TC_MODULE + 4 * i);
}
tdev->firmware[8] = 0;
tdev->vendor[8] = 0;
tdev->name[8] = 0;
pr_info("%s: %s %s %s\n", dev_name(&tdev->dev), tdev->vendor,
tdev->name, tdev->firmware);
devsize = readb(module + offset + TC_SLOT_SIZE);
devsize <<= 22;
if (devsize <= slotsize) {
tdev->resource.start = slotaddr;
tdev->resource.end = slotaddr + devsize - 1;
} else if (devsize <= extslotsize) {
tdev->resource.start = extslotaddr;
tdev->resource.end = extslotaddr + devsize - 1;
} else {
pr_err("%s: Cannot provide slot space "
"(%ldMiB required, up to %ldMiB supported)\n",
dev_name(&tdev->dev), (long)(devsize >> 20),
(long)(max(slotsize, extslotsize) >> 20));
kfree(tdev);
goto out_err;
}
tdev->resource.name = tdev->name;
tdev->resource.flags = IORESOURCE_MEM;
tc_device_get_irq(tdev);
if (device_register(&tdev->dev)) {
put_device(&tdev->dev);
goto out_err;
}
list_add_tail(&tdev->node, &tbus->devices);
out_err:
iounmap(module);
}
}
/*
* The main entry.
*/
static int __init tc_init(void)
{
/* Initialize the TURBOchannel bus */
if (tc_bus_get_info(&tc_bus))
goto out_err;
INIT_LIST_HEAD(&tc_bus.devices);
dev_set_name(&tc_bus.dev, "tc");
if (device_register(&tc_bus.dev))
goto out_err_device;
if (tc_bus.info.slot_size) {
unsigned int tc_clock = tc_get_speed(&tc_bus) / 100000;
pr_info("tc: TURBOchannel rev. %d at %d.%d MHz "
"(with%s parity)\n", tc_bus.info.revision,
tc_clock / 10, tc_clock % 10,
tc_bus.info.parity ? "" : "out");
tc_bus.resource[0].start = tc_bus.slot_base;
tc_bus.resource[0].end = tc_bus.slot_base +
(tc_bus.info.slot_size << 20) *
tc_bus.num_tcslots - 1;
tc_bus.resource[0].name = tc_bus.name;
tc_bus.resource[0].flags = IORESOURCE_MEM;
if (request_resource(&iomem_resource,
&tc_bus.resource[0]) < 0) {
pr_err("tc: Cannot reserve resource\n");
goto out_err_device;
}
if (tc_bus.ext_slot_size) {
tc_bus.resource[1].start = tc_bus.ext_slot_base;
tc_bus.resource[1].end = tc_bus.ext_slot_base +
tc_bus.ext_slot_size *
tc_bus.num_tcslots - 1;
tc_bus.resource[1].name = tc_bus.name;
tc_bus.resource[1].flags = IORESOURCE_MEM;
if (request_resource(&iomem_resource,
&tc_bus.resource[1]) < 0) {
pr_err("tc: Cannot reserve resource\n");
goto out_err_resource;
}
}
tc_bus_add_devices(&tc_bus);
}
return 0;
out_err_resource:
release_resource(&tc_bus.resource[0]);
out_err_device:
put_device(&tc_bus.dev);
out_err:
return 0;
}
subsys_initcall(tc_init);