linux/arch/arm/mach-s3c24xx/s3c2412.c
Linus Torvalds 0195c00244 Disintegrate and delete asm/system.h
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Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system

Pull "Disintegrate and delete asm/system.h" from David Howells:
 "Here are a bunch of patches to disintegrate asm/system.h into a set of
  separate bits to relieve the problem of circular inclusion
  dependencies.

  I've built all the working defconfigs from all the arches that I can
  and made sure that they don't break.

  The reason for these patches is that I recently encountered a circular
  dependency problem that came about when I produced some patches to
  optimise get_order() by rewriting it to use ilog2().

  This uses bitops - and on the SH arch asm/bitops.h drags in
  asm-generic/get_order.h by a circuituous route involving asm/system.h.

  The main difficulty seems to be asm/system.h.  It holds a number of
  low level bits with no/few dependencies that are commonly used (eg.
  memory barriers) and a number of bits with more dependencies that
  aren't used in many places (eg.  switch_to()).

  These patches break asm/system.h up into the following core pieces:

    (1) asm/barrier.h

        Move memory barriers here.  This already done for MIPS and Alpha.

    (2) asm/switch_to.h

        Move switch_to() and related stuff here.

    (3) asm/exec.h

        Move arch_align_stack() here.  Other process execution related bits
        could perhaps go here from asm/processor.h.

    (4) asm/cmpxchg.h

        Move xchg() and cmpxchg() here as they're full word atomic ops and
        frequently used by atomic_xchg() and atomic_cmpxchg().

    (5) asm/bug.h

        Move die() and related bits.

    (6) asm/auxvec.h

        Move AT_VECTOR_SIZE_ARCH here.

  Other arch headers are created as needed on a per-arch basis."

Fixed up some conflicts from other header file cleanups and moving code
around that has happened in the meantime, so David's testing is somewhat
weakened by that.  We'll find out anything that got broken and fix it..

* tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits)
  Delete all instances of asm/system.h
  Remove all #inclusions of asm/system.h
  Add #includes needed to permit the removal of asm/system.h
  Move all declarations of free_initmem() to linux/mm.h
  Disintegrate asm/system.h for OpenRISC
  Split arch_align_stack() out from asm-generic/system.h
  Split the switch_to() wrapper out of asm-generic/system.h
  Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h
  Create asm-generic/barrier.h
  Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h
  Disintegrate asm/system.h for Xtensa
  Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt]
  Disintegrate asm/system.h for Tile
  Disintegrate asm/system.h for Sparc
  Disintegrate asm/system.h for SH
  Disintegrate asm/system.h for Score
  Disintegrate asm/system.h for S390
  Disintegrate asm/system.h for PowerPC
  Disintegrate asm/system.h for PA-RISC
  Disintegrate asm/system.h for MN10300
  ...
2012-03-28 15:58:21 -07:00

253 lines
5.9 KiB
C

/* linux/arch/arm/mach-s3c2412/s3c2412.c
*
* Copyright (c) 2006 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* http://armlinux.simtec.co.uk/.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/syscore_ops.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <mach/hardware.h>
#include <asm/proc-fns.h>
#include <asm/irq.h>
#include <asm/system_misc.h>
#include <plat/cpu-freq.h>
#include <mach/regs-clock.h>
#include <plat/regs-serial.h>
#include <mach/regs-power.h>
#include <mach/regs-gpio.h>
#include <mach/regs-gpioj.h>
#include <mach/regs-dsc.h>
#include <plat/regs-spi.h>
#include <mach/regs-s3c2412.h>
#include <plat/s3c2412.h>
#include <plat/cpu.h>
#include <plat/devs.h>
#include <plat/clock.h>
#include <plat/pm.h>
#include <plat/pll.h>
#include <plat/nand-core.h>
#ifndef CONFIG_CPU_S3C2412_ONLY
void __iomem *s3c24xx_va_gpio2 = S3C24XX_VA_GPIO;
static inline void s3c2412_init_gpio2(void)
{
s3c24xx_va_gpio2 = S3C24XX_VA_GPIO + 0x10;
}
#else
#define s3c2412_init_gpio2() do { } while(0)
#endif
/* Initial IO mappings */
static struct map_desc s3c2412_iodesc[] __initdata = {
IODESC_ENT(CLKPWR),
IODESC_ENT(TIMER),
IODESC_ENT(WATCHDOG),
{
.virtual = (unsigned long)S3C2412_VA_SSMC,
.pfn = __phys_to_pfn(S3C2412_PA_SSMC),
.length = SZ_1M,
.type = MT_DEVICE,
},
{
.virtual = (unsigned long)S3C2412_VA_EBI,
.pfn = __phys_to_pfn(S3C2412_PA_EBI),
.length = SZ_1M,
.type = MT_DEVICE,
},
};
/* uart registration process */
void __init s3c2412_init_uarts(struct s3c2410_uartcfg *cfg, int no)
{
s3c24xx_init_uartdevs("s3c2412-uart", s3c2410_uart_resources, cfg, no);
/* rename devices that are s3c2412/s3c2413 specific */
s3c_device_sdi.name = "s3c2412-sdi";
s3c_device_lcd.name = "s3c2412-lcd";
s3c_nand_setname("s3c2412-nand");
/* alter IRQ of SDI controller */
s3c_device_sdi.resource[1].start = IRQ_S3C2412_SDI;
s3c_device_sdi.resource[1].end = IRQ_S3C2412_SDI;
/* spi channel related changes, s3c2412/13 specific */
s3c_device_spi0.name = "s3c2412-spi";
s3c_device_spi0.resource[0].end = S3C24XX_PA_SPI + 0x24;
s3c_device_spi1.name = "s3c2412-spi";
s3c_device_spi1.resource[0].start = S3C24XX_PA_SPI + S3C2412_SPI1;
s3c_device_spi1.resource[0].end = S3C24XX_PA_SPI + S3C2412_SPI1 + 0x24;
}
/* s3c2412_idle
*
* use the standard idle call by ensuring the idle mode
* in power config, then issuing the idle co-processor
* instruction
*/
static void s3c2412_idle(void)
{
unsigned long tmp;
/* ensure our idle mode is to go to idle */
tmp = __raw_readl(S3C2412_PWRCFG);
tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
__raw_writel(tmp, S3C2412_PWRCFG);
cpu_do_idle();
}
void s3c2412_restart(char mode, const char *cmd)
{
if (mode == 's')
soft_restart(0);
/* errata "Watch-dog/Software Reset Problem" specifies that
* this reset must be done with the SYSCLK sourced from
* EXTCLK instead of FOUT to avoid a glitch in the reset
* mechanism.
*
* See the watchdog section of the S3C2412 manual for more
* information on this fix.
*/
__raw_writel(0x00, S3C2412_CLKSRC);
__raw_writel(S3C2412_SWRST_RESET, S3C2412_SWRST);
mdelay(1);
}
/* s3c2412_map_io
*
* register the standard cpu IO areas, and any passed in from the
* machine specific initialisation.
*/
void __init s3c2412_map_io(void)
{
/* move base of IO */
s3c2412_init_gpio2();
/* set our idle function */
arm_pm_idle = s3c2412_idle;
/* register our io-tables */
iotable_init(s3c2412_iodesc, ARRAY_SIZE(s3c2412_iodesc));
}
void __init_or_cpufreq s3c2412_setup_clocks(void)
{
struct clk *xtal_clk;
unsigned long tmp;
unsigned long xtal;
unsigned long fclk;
unsigned long hclk;
unsigned long pclk;
xtal_clk = clk_get(NULL, "xtal");
xtal = clk_get_rate(xtal_clk);
clk_put(xtal_clk);
/* now we've got our machine bits initialised, work out what
* clocks we've got */
fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal * 2);
clk_mpll.rate = fclk;
tmp = __raw_readl(S3C2410_CLKDIVN);
/* work out clock scalings */
hclk = fclk / ((tmp & S3C2412_CLKDIVN_HDIVN_MASK) + 1);
hclk /= ((tmp & S3C2412_CLKDIVN_ARMDIVN) ? 2 : 1);
pclk = hclk / ((tmp & S3C2412_CLKDIVN_PDIVN) ? 2 : 1);
/* print brieft summary of clocks, etc */
printk("S3C2412: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
s3c24xx_setup_clocks(fclk, hclk, pclk);
}
void __init s3c2412_init_clocks(int xtal)
{
/* initialise the clocks here, to allow other things like the
* console to use them
*/
s3c24xx_register_baseclocks(xtal);
s3c2412_setup_clocks();
s3c2412_baseclk_add();
}
/* need to register the subsystem before we actually register the device, and
* we also need to ensure that it has been initialised before any of the
* drivers even try to use it (even if not on an s3c2412 based system)
* as a driver which may support both 2410 and 2440 may try and use it.
*/
struct bus_type s3c2412_subsys = {
.name = "s3c2412-core",
.dev_name = "s3c2412-core",
};
static int __init s3c2412_core_init(void)
{
return subsys_system_register(&s3c2412_subsys, NULL);
}
core_initcall(s3c2412_core_init);
static struct device s3c2412_dev = {
.bus = &s3c2412_subsys,
};
int __init s3c2412_init(void)
{
printk("S3C2412: Initialising architecture\n");
#ifdef CONFIG_PM
register_syscore_ops(&s3c2412_pm_syscore_ops);
#endif
register_syscore_ops(&s3c24xx_irq_syscore_ops);
return device_register(&s3c2412_dev);
}