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![Tejun Heo](/assets/img/avatar_default.png)
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>
412 lines
10 KiB
C
412 lines
10 KiB
C
/*
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* AVR32 SMC/CFC PATA Driver
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*
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* Copyright (C) 2007 Atmel Norway
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*/
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#define DEBUG
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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#include <scsi/scsi_host.h>
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#include <linux/ata.h>
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#include <linux/libata.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <mach/board.h>
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#include <mach/smc.h>
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#define DRV_NAME "pata_at32"
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#define DRV_VERSION "0.0.3"
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/*
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* CompactFlash controller memory layout relative to the base address:
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*
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* Attribute memory: 0000 0000 -> 003f ffff
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* Common memory: 0040 0000 -> 007f ffff
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* I/O memory: 0080 0000 -> 00bf ffff
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* True IDE Mode: 00c0 0000 -> 00df ffff
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* Alt IDE Mode: 00e0 0000 -> 00ff ffff
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*
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* Only True IDE and Alt True IDE mode are needed for this driver.
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*
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* True IDE mode => CS0 = 0, CS1 = 1 (cmd, error, stat, etc)
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* Alt True IDE mode => CS0 = 1, CS1 = 0 (ctl, alt_stat)
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*/
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#define CF_IDE_OFFSET 0x00c00000
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#define CF_ALT_IDE_OFFSET 0x00e00000
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#define CF_RES_SIZE 2048
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/*
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* Define DEBUG_BUS if you are doing debugging of your own EBI -> PATA
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* adaptor with a logic analyzer or similar.
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*/
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#undef DEBUG_BUS
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/*
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* ATA PIO modes
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*
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* Name | Mb/s | Min cycle time | Mask
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* --------+-------+----------------+--------
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* Mode 0 | 3.3 | 600 ns | 0x01
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* Mode 1 | 5.2 | 383 ns | 0x03
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* Mode 2 | 8.3 | 240 ns | 0x07
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* Mode 3 | 11.1 | 180 ns | 0x0f
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* Mode 4 | 16.7 | 120 ns | 0x1f
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*
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* Alter PIO_MASK below according to table to set maximal PIO mode.
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*/
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enum {
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PIO_MASK = ATA_PIO4,
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};
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/*
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* Struct containing private information about device.
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*/
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struct at32_ide_info {
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unsigned int irq;
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struct resource res_ide;
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struct resource res_alt;
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void __iomem *ide_addr;
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void __iomem *alt_addr;
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unsigned int cs;
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struct smc_config smc;
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};
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/*
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* Setup SMC for the given ATA timing.
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*/
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static int pata_at32_setup_timing(struct device *dev,
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struct at32_ide_info *info,
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const struct ata_timing *ata)
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{
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struct smc_config *smc = &info->smc;
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struct smc_timing timing;
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int active;
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int recover;
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memset(&timing, 0, sizeof(struct smc_timing));
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/* Total cycle time */
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timing.read_cycle = ata->cyc8b;
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/* DIOR <= CFIOR timings */
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timing.nrd_setup = ata->setup;
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timing.nrd_pulse = ata->act8b;
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timing.nrd_recover = ata->rec8b;
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/* Convert nanosecond timing to clock cycles */
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smc_set_timing(smc, &timing);
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/* Add one extra cycle setup due to signal ring */
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smc->nrd_setup = smc->nrd_setup + 1;
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active = smc->nrd_setup + smc->nrd_pulse;
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recover = smc->read_cycle - active;
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/* Need at least two cycles recovery */
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if (recover < 2)
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smc->read_cycle = active + 2;
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/* (CS0, CS1, DIR, OE) <= (CFCE1, CFCE2, CFRNW, NCSX) timings */
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smc->ncs_read_setup = 1;
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smc->ncs_read_pulse = smc->read_cycle - 2;
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/* Write timings same as read timings */
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smc->write_cycle = smc->read_cycle;
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smc->nwe_setup = smc->nrd_setup;
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smc->nwe_pulse = smc->nrd_pulse;
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smc->ncs_write_setup = smc->ncs_read_setup;
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smc->ncs_write_pulse = smc->ncs_read_pulse;
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/* Do some debugging output of ATA and SMC timings */
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dev_dbg(dev, "ATA: C=%d S=%d P=%d R=%d\n",
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ata->cyc8b, ata->setup, ata->act8b, ata->rec8b);
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dev_dbg(dev, "SMC: C=%d S=%d P=%d NS=%d NP=%d\n",
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smc->read_cycle, smc->nrd_setup, smc->nrd_pulse,
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smc->ncs_read_setup, smc->ncs_read_pulse);
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/* Finally, configure the SMC */
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return smc_set_configuration(info->cs, smc);
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}
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/*
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* Procedures for libATA.
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*/
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static void pata_at32_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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struct ata_timing timing;
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struct at32_ide_info *info = ap->host->private_data;
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int ret;
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/* Compute ATA timing */
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ret = ata_timing_compute(adev, adev->pio_mode, &timing, 1000, 0);
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if (ret) {
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dev_warn(ap->dev, "Failed to compute ATA timing %d\n", ret);
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return;
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}
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/* Setup SMC to ATA timing */
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ret = pata_at32_setup_timing(ap->dev, info, &timing);
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if (ret) {
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dev_warn(ap->dev, "Failed to setup ATA timing %d\n", ret);
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return;
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}
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}
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static struct scsi_host_template at32_sht = {
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ATA_PIO_SHT(DRV_NAME),
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};
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static struct ata_port_operations at32_port_ops = {
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.inherits = &ata_sff_port_ops,
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.cable_detect = ata_cable_40wire,
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.set_piomode = pata_at32_set_piomode,
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};
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static int __init pata_at32_init_one(struct device *dev,
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struct at32_ide_info *info)
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{
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struct ata_host *host;
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struct ata_port *ap;
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host = ata_host_alloc(dev, 1);
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if (!host)
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return -ENOMEM;
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ap = host->ports[0];
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/* Setup ATA bindings */
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ap->ops = &at32_port_ops;
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ap->pio_mask = PIO_MASK;
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ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_SLAVE_POSS;
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/*
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* Since all 8-bit taskfile transfers has to go on the lower
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* byte of the data bus and there is a bug in the SMC that
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* makes it impossible to alter the bus width during runtime,
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* we need to hardwire the address signals as follows:
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*
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* A_IDE(2:0) <= A_EBI(3:1)
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*
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* This makes all addresses on the EBI even, thus all data
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* will be on the lower byte of the data bus. All addresses
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* used by libATA need to be altered according to this.
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*/
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ap->ioaddr.altstatus_addr = info->alt_addr + (0x06 << 1);
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ap->ioaddr.ctl_addr = info->alt_addr + (0x06 << 1);
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ap->ioaddr.data_addr = info->ide_addr + (ATA_REG_DATA << 1);
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ap->ioaddr.error_addr = info->ide_addr + (ATA_REG_ERR << 1);
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ap->ioaddr.feature_addr = info->ide_addr + (ATA_REG_FEATURE << 1);
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ap->ioaddr.nsect_addr = info->ide_addr + (ATA_REG_NSECT << 1);
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ap->ioaddr.lbal_addr = info->ide_addr + (ATA_REG_LBAL << 1);
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ap->ioaddr.lbam_addr = info->ide_addr + (ATA_REG_LBAM << 1);
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ap->ioaddr.lbah_addr = info->ide_addr + (ATA_REG_LBAH << 1);
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ap->ioaddr.device_addr = info->ide_addr + (ATA_REG_DEVICE << 1);
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ap->ioaddr.status_addr = info->ide_addr + (ATA_REG_STATUS << 1);
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ap->ioaddr.command_addr = info->ide_addr + (ATA_REG_CMD << 1);
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/* Set info as private data of ATA host */
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host->private_data = info;
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/* Register ATA device and return */
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return ata_host_activate(host, info->irq, ata_sff_interrupt,
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IRQF_SHARED | IRQF_TRIGGER_RISING,
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&at32_sht);
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}
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/*
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* This function may come in handy for people analyzing their own
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* EBI -> PATA adaptors.
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*/
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#ifdef DEBUG_BUS
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static void __init pata_at32_debug_bus(struct device *dev,
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struct at32_ide_info *info)
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{
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const int d1 = 0xff;
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const int d2 = 0x00;
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int i;
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/* Write 8-bit values (registers) */
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iowrite8(d1, info->alt_addr + (0x06 << 1));
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iowrite8(d2, info->alt_addr + (0x06 << 1));
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for (i = 0; i < 8; i++) {
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iowrite8(d1, info->ide_addr + (i << 1));
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iowrite8(d2, info->ide_addr + (i << 1));
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}
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/* Write 16 bit values (data) */
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iowrite16(d1, info->ide_addr);
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iowrite16(d1 << 8, info->ide_addr);
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iowrite16(d1, info->ide_addr);
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iowrite16(d1 << 8, info->ide_addr);
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}
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#endif
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static int __init pata_at32_probe(struct platform_device *pdev)
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{
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const struct ata_timing initial_timing =
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{XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0};
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struct device *dev = &pdev->dev;
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struct at32_ide_info *info;
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struct ide_platform_data *board = pdev->dev.platform_data;
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struct resource *res;
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int irq;
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int ret;
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if (!board)
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return -ENXIO;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENXIO;
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/* Retrive IRQ */
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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/* Setup struct containing private information */
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info = kzalloc(sizeof(struct at32_ide_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->irq = irq;
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info->cs = board->cs;
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/* Request memory resources */
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info->res_ide.start = res->start + CF_IDE_OFFSET;
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info->res_ide.end = info->res_ide.start + CF_RES_SIZE - 1;
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info->res_ide.name = "ide";
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info->res_ide.flags = IORESOURCE_MEM;
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ret = request_resource(res, &info->res_ide);
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if (ret)
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goto err_req_res_ide;
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info->res_alt.start = res->start + CF_ALT_IDE_OFFSET;
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info->res_alt.end = info->res_alt.start + CF_RES_SIZE - 1;
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info->res_alt.name = "alt";
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info->res_alt.flags = IORESOURCE_MEM;
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ret = request_resource(res, &info->res_alt);
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if (ret)
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goto err_req_res_alt;
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/* Setup non-timing elements of SMC */
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info->smc.bus_width = 2; /* 16 bit data bus */
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info->smc.nrd_controlled = 1; /* Sample data on rising edge of NRD */
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info->smc.nwe_controlled = 0; /* Drive data on falling edge of NCS */
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info->smc.nwait_mode = 3; /* NWAIT is in READY mode */
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info->smc.byte_write = 0; /* Byte select access type */
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info->smc.tdf_mode = 0; /* TDF optimization disabled */
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info->smc.tdf_cycles = 0; /* No TDF wait cycles */
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/* Setup SMC to ATA timing */
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ret = pata_at32_setup_timing(dev, info, &initial_timing);
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if (ret)
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goto err_setup_timing;
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/* Map ATA address space */
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ret = -ENOMEM;
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info->ide_addr = devm_ioremap(dev, info->res_ide.start, 16);
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info->alt_addr = devm_ioremap(dev, info->res_alt.start, 16);
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if (!info->ide_addr || !info->alt_addr)
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goto err_ioremap;
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#ifdef DEBUG_BUS
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pata_at32_debug_bus(dev, info);
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#endif
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/* Setup and register ATA device */
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ret = pata_at32_init_one(dev, info);
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if (ret)
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goto err_ata_device;
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return 0;
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err_ata_device:
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err_ioremap:
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err_setup_timing:
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release_resource(&info->res_alt);
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err_req_res_alt:
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release_resource(&info->res_ide);
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err_req_res_ide:
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kfree(info);
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return ret;
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}
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static int __exit pata_at32_remove(struct platform_device *pdev)
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{
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struct ata_host *host = platform_get_drvdata(pdev);
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struct at32_ide_info *info;
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if (!host)
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return 0;
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info = host->private_data;
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ata_host_detach(host);
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if (!info)
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return 0;
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release_resource(&info->res_ide);
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release_resource(&info->res_alt);
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kfree(info);
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return 0;
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}
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/* work with hotplug and coldplug */
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MODULE_ALIAS("platform:at32_ide");
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static struct platform_driver pata_at32_driver = {
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.remove = __exit_p(pata_at32_remove),
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.driver = {
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.name = "at32_ide",
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.owner = THIS_MODULE,
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},
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};
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static int __init pata_at32_init(void)
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{
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return platform_driver_probe(&pata_at32_driver, pata_at32_probe);
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}
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static void __exit pata_at32_exit(void)
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{
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platform_driver_unregister(&pata_at32_driver);
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}
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module_init(pata_at32_init);
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module_exit(pata_at32_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("AVR32 SMC/CFC PATA Driver");
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MODULE_AUTHOR("Kristoffer Nyborg Gregertsen <kngregertsen@norway.atmel.com>");
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MODULE_VERSION(DRV_VERSION);
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