2009-07-31 00:23:37 +02:00
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/* linux/arch/arm/plat-s3c24xx/s3c2412-iotiming.c
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*
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2009-11-13 23:54:14 +01:00
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* Copyright (c) 2006-2008 Simtec Electronics
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2009-07-31 00:23:37 +02:00
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C2412/S3C2443 (PL093 based) IO timing support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/cpufreq.h>
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2009-07-31 00:23:42 +02:00
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#include <linux/seq_file.h>
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2011-12-22 01:26:03 +01:00
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#include <linux/device.h>
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2009-07-31 00:23:37 +02:00
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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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
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#include <linux/slab.h>
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2009-07-31 00:23:37 +02:00
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#include <linux/amba/pl093.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include <mach/regs-s3c2412-mem.h>
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#include <plat/cpu.h>
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#include <plat/cpu-freq-core.h>
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#include <plat/clock.h>
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#define print_ns(x) ((x) / 10), ((x) % 10)
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/**
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* s3c2412_print_timing - print timing infromation via printk.
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* @pfx: The prefix to print each line with.
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* @iot: The IO timing information
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*/
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static void s3c2412_print_timing(const char *pfx, struct s3c_iotimings *iot)
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{
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struct s3c2412_iobank_timing *bt;
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unsigned int bank;
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for (bank = 0; bank < MAX_BANKS; bank++) {
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bt = iot->bank[bank].io_2412;
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if (!bt)
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continue;
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printk(KERN_DEBUG "%s: %d: idcy=%d.%d wstrd=%d.%d wstwr=%d,%d"
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"wstoen=%d.%d wstwen=%d.%d wstbrd=%d.%d\n", pfx, bank,
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print_ns(bt->idcy),
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print_ns(bt->wstrd),
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print_ns(bt->wstwr),
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print_ns(bt->wstoen),
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print_ns(bt->wstwen),
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print_ns(bt->wstbrd));
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}
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}
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/**
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* to_div - turn a cycle length into a divisor setting.
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* @cyc_tns: The cycle time in 10ths of nanoseconds.
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* @clk_tns: The clock period in 10ths of nanoseconds.
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*/
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static inline unsigned int to_div(unsigned int cyc_tns, unsigned int clk_tns)
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{
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return cyc_tns ? DIV_ROUND_UP(cyc_tns, clk_tns) : 0;
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}
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/**
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* calc_timing - calculate timing divisor value and check in range.
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* @hwtm: The hardware timing in 10ths of nanoseconds.
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* @clk_tns: The clock period in 10ths of nanoseconds.
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* @err: Pointer to err variable to update in event of failure.
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*/
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static unsigned int calc_timing(unsigned int hwtm, unsigned int clk_tns,
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unsigned int *err)
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{
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unsigned int ret = to_div(hwtm, clk_tns);
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if (ret > 0xf)
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*err = -EINVAL;
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return ret;
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}
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/**
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* s3c2412_calc_bank - calculate the bank divisor settings.
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* @cfg: The current frequency configuration.
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* @bt: The bank timing.
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*/
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static int s3c2412_calc_bank(struct s3c_cpufreq_config *cfg,
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struct s3c2412_iobank_timing *bt)
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{
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unsigned int hclk = cfg->freq.hclk_tns;
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int err = 0;
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bt->smbidcyr = calc_timing(bt->idcy, hclk, &err);
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bt->smbwstrd = calc_timing(bt->wstrd, hclk, &err);
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bt->smbwstwr = calc_timing(bt->wstwr, hclk, &err);
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bt->smbwstoen = calc_timing(bt->wstoen, hclk, &err);
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bt->smbwstwen = calc_timing(bt->wstwen, hclk, &err);
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bt->smbwstbrd = calc_timing(bt->wstbrd, hclk, &err);
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return err;
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}
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2009-07-31 00:23:42 +02:00
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/**
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* s3c2412_iotiming_debugfs - debugfs show io bank timing information
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* @seq: The seq_file to write output to using seq_printf().
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* @cfg: The current configuration.
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* @iob: The IO bank information to decode.
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*/
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void s3c2412_iotiming_debugfs(struct seq_file *seq,
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struct s3c_cpufreq_config *cfg,
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union s3c_iobank *iob)
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{
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struct s3c2412_iobank_timing *bt = iob->io_2412;
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seq_printf(seq,
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"\tRead: idcy=%d.%d wstrd=%d.%d wstwr=%d,%d"
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"wstoen=%d.%d wstwen=%d.%d wstbrd=%d.%d\n",
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print_ns(bt->idcy),
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print_ns(bt->wstrd),
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print_ns(bt->wstwr),
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print_ns(bt->wstoen),
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print_ns(bt->wstwen),
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print_ns(bt->wstbrd));
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}
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2009-07-31 00:23:37 +02:00
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/**
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* s3c2412_iotiming_calc - calculate all the bank divisor settings.
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* @cfg: The current frequency configuration.
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* @iot: The bank timing information.
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*
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* Calculate the timing information for all the banks that are
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* configured as IO, using s3c2412_calc_bank().
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*/
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int s3c2412_iotiming_calc(struct s3c_cpufreq_config *cfg,
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struct s3c_iotimings *iot)
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{
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struct s3c2412_iobank_timing *bt;
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int bank;
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int ret;
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for (bank = 0; bank < MAX_BANKS; bank++) {
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bt = iot->bank[bank].io_2412;
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if (!bt)
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continue;
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ret = s3c2412_calc_bank(cfg, bt);
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if (ret) {
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printk(KERN_ERR "%s: cannot calculate bank %d io\n",
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__func__, bank);
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goto err;
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}
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}
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return 0;
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err:
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return ret;
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}
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/**
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* s3c2412_iotiming_set - set the timing information
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* @cfg: The current frequency configuration.
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* @iot: The bank timing information.
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*
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* Set the IO bank information from the details calculated earlier from
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* calling s3c2412_iotiming_calc().
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*/
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void s3c2412_iotiming_set(struct s3c_cpufreq_config *cfg,
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struct s3c_iotimings *iot)
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{
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struct s3c2412_iobank_timing *bt;
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void __iomem *regs;
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int bank;
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/* set the io timings from the specifier */
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for (bank = 0; bank < MAX_BANKS; bank++) {
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bt = iot->bank[bank].io_2412;
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if (!bt)
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continue;
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regs = S3C2412_SSMC_BANK(bank);
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__raw_writel(bt->smbidcyr, regs + SMBIDCYR);
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__raw_writel(bt->smbwstrd, regs + SMBWSTRDR);
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__raw_writel(bt->smbwstwr, regs + SMBWSTWRR);
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__raw_writel(bt->smbwstoen, regs + SMBWSTOENR);
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__raw_writel(bt->smbwstwen, regs + SMBWSTWENR);
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__raw_writel(bt->smbwstbrd, regs + SMBWSTBRDR);
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}
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}
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static inline unsigned int s3c2412_decode_timing(unsigned int clock, u32 reg)
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{
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return (reg & 0xf) * clock;
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}
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static void s3c2412_iotiming_getbank(struct s3c_cpufreq_config *cfg,
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struct s3c2412_iobank_timing *bt,
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unsigned int bank)
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{
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unsigned long clk = cfg->freq.hclk_tns; /* ssmc clock??? */
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void __iomem *regs = S3C2412_SSMC_BANK(bank);
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bt->idcy = s3c2412_decode_timing(clk, __raw_readl(regs + SMBIDCYR));
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bt->wstrd = s3c2412_decode_timing(clk, __raw_readl(regs + SMBWSTRDR));
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bt->wstoen = s3c2412_decode_timing(clk, __raw_readl(regs + SMBWSTOENR));
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bt->wstwen = s3c2412_decode_timing(clk, __raw_readl(regs + SMBWSTWENR));
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bt->wstbrd = s3c2412_decode_timing(clk, __raw_readl(regs + SMBWSTBRDR));
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}
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/**
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* bank_is_io - return true if bank is (possibly) IO.
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* @bank: The bank number.
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* @bankcfg: The value of S3C2412_EBI_BANKCFG.
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*/
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static inline bool bank_is_io(unsigned int bank, u32 bankcfg)
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{
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if (bank < 2)
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return true;
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return !(bankcfg & (1 << bank));
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}
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int s3c2412_iotiming_get(struct s3c_cpufreq_config *cfg,
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struct s3c_iotimings *timings)
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{
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struct s3c2412_iobank_timing *bt;
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u32 bankcfg = __raw_readl(S3C2412_EBI_BANKCFG);
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unsigned int bank;
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/* look through all banks to see what is currently set. */
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for (bank = 0; bank < MAX_BANKS; bank++) {
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if (!bank_is_io(bank, bankcfg))
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continue;
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bt = kzalloc(sizeof(struct s3c2412_iobank_timing), GFP_KERNEL);
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if (!bt) {
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printk(KERN_ERR "%s: no memory for bank\n", __func__);
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return -ENOMEM;
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}
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timings->bank[bank].io_2412 = bt;
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s3c2412_iotiming_getbank(cfg, bt, bank);
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}
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s3c2412_print_timing("get", timings);
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return 0;
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}
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/* this is in here as it is so small, it doesn't currently warrant a file
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* to itself. We expect that any s3c24xx needing this is going to also
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* need the iotiming support.
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*/
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void s3c2412_cpufreq_setrefresh(struct s3c_cpufreq_config *cfg)
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{
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struct s3c_cpufreq_board *board = cfg->board;
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u32 refresh;
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WARN_ON(board == NULL);
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/* Reduce both the refresh time (in ns) and the frequency (in MHz)
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* down to ensure that we do not overflow 32 bit numbers.
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*
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* This should work for HCLK up to 133MHz and refresh period up
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* to 30usec.
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*/
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refresh = (cfg->freq.hclk / 100) * (board->refresh / 10);
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refresh = DIV_ROUND_UP(refresh, (1000 * 1000)); /* apply scale */
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refresh &= ((1 << 16) - 1);
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s3c_freq_dbg("%s: refresh value %u\n", __func__, (unsigned int)refresh);
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__raw_writel(refresh, S3C2412_REFRESH);
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}
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