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io.c

/*
 * linux/arch/arm/mach-omap2/io.c
 *
 * OMAP2 I/O mapping code
 *
 * Copyright (C) 2005 Nokia Corporation
 * Copyright (C) 2007-2009 Texas Instruments
 *
 * Author:
 *    Juha Yrjola <juha.yrjola@nokia.com>
 *    Syed Khasim <x0khasim@ti.com>
 *
 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
 *
 * 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/omapfb.h>

#include <asm/tlb.h>

#include <asm/mach/map.h>

#include <plat/sram.h>
#include <plat/sdrc.h>
#include <plat/gpmc.h>
#include <plat/serial.h>

#include "clock2xxx.h"
#include "clock3xxx.h"
#include "clock44xx.h"
#include "io.h"

#include <plat/omap-pm.h>
#include "powerdomain.h"

#include "clockdomain.h"
#include <plat/omap_hwmod.h>
#include <plat/multi.h>

/*
 * The machine specific code may provide the extra mapping besides the
 * default mapping provided here.
 */

#ifdef CONFIG_ARCH_OMAP2
static struct map_desc omap24xx_io_desc[] __initdata = {
      {
            .virtual    = L3_24XX_VIRT,
            .pfn        = __phys_to_pfn(L3_24XX_PHYS),
            .length           = L3_24XX_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = L4_24XX_VIRT,
            .pfn        = __phys_to_pfn(L4_24XX_PHYS),
            .length           = L4_24XX_SIZE,
            .type       = MT_DEVICE
      },
};

#ifdef CONFIG_ARCH_OMAP2420
static struct map_desc omap242x_io_desc[] __initdata = {
      {
            .virtual    = DSP_MEM_2420_VIRT,
            .pfn        = __phys_to_pfn(DSP_MEM_2420_PHYS),
            .length           = DSP_MEM_2420_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = DSP_IPI_2420_VIRT,
            .pfn        = __phys_to_pfn(DSP_IPI_2420_PHYS),
            .length           = DSP_IPI_2420_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = DSP_MMU_2420_VIRT,
            .pfn        = __phys_to_pfn(DSP_MMU_2420_PHYS),
            .length           = DSP_MMU_2420_SIZE,
            .type       = MT_DEVICE
      },
};

#endif

#ifdef CONFIG_ARCH_OMAP2430
static struct map_desc omap243x_io_desc[] __initdata = {
      {
            .virtual    = L4_WK_243X_VIRT,
            .pfn        = __phys_to_pfn(L4_WK_243X_PHYS),
            .length           = L4_WK_243X_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = OMAP243X_GPMC_VIRT,
            .pfn        = __phys_to_pfn(OMAP243X_GPMC_PHYS),
            .length           = OMAP243X_GPMC_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = OMAP243X_SDRC_VIRT,
            .pfn        = __phys_to_pfn(OMAP243X_SDRC_PHYS),
            .length           = OMAP243X_SDRC_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = OMAP243X_SMS_VIRT,
            .pfn        = __phys_to_pfn(OMAP243X_SMS_PHYS),
            .length           = OMAP243X_SMS_SIZE,
            .type       = MT_DEVICE
      },
};
#endif
#endif

#ifdef      CONFIG_ARCH_OMAP3
static struct map_desc omap34xx_io_desc[] __initdata = {
      {
            .virtual    = L3_34XX_VIRT,
            .pfn        = __phys_to_pfn(L3_34XX_PHYS),
            .length           = L3_34XX_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = L4_34XX_VIRT,
            .pfn        = __phys_to_pfn(L4_34XX_PHYS),
            .length           = L4_34XX_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = OMAP34XX_GPMC_VIRT,
            .pfn        = __phys_to_pfn(OMAP34XX_GPMC_PHYS),
            .length           = OMAP34XX_GPMC_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = OMAP343X_SMS_VIRT,
            .pfn        = __phys_to_pfn(OMAP343X_SMS_PHYS),
            .length           = OMAP343X_SMS_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = OMAP343X_SDRC_VIRT,
            .pfn        = __phys_to_pfn(OMAP343X_SDRC_PHYS),
            .length           = OMAP343X_SDRC_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = L4_PER_34XX_VIRT,
            .pfn        = __phys_to_pfn(L4_PER_34XX_PHYS),
            .length           = L4_PER_34XX_SIZE,
            .type       = MT_DEVICE
      },
      {
            .virtual    = L4_EMU_34XX_VIRT,
            .pfn        = __phys_to_pfn(L4_EMU_34XX_PHYS),
            .length           = L4_EMU_34XX_SIZE,
            .type       = MT_DEVICE
      },
#if defined(CONFIG_DEBUG_LL) &&                                         \
      (defined(CONFIG_MACH_OMAP_ZOOM2) || defined(CONFIG_MACH_OMAP_ZOOM3))
      {
            .virtual    = ZOOM_UART_VIRT,
            .pfn        = __phys_to_pfn(ZOOM_UART_BASE),
            .length           = SZ_1M,
            .type       = MT_DEVICE
      },
#endif
};
#endif
#ifdef      CONFIG_ARCH_OMAP4
static struct map_desc omap44xx_io_desc[] __initdata = {
      {
            .virtual    = L3_44XX_VIRT,
            .pfn        = __phys_to_pfn(L3_44XX_PHYS),
            .length           = L3_44XX_SIZE,
            .type       = MT_DEVICE,
      },
      {
            .virtual    = L4_44XX_VIRT,
            .pfn        = __phys_to_pfn(L4_44XX_PHYS),
            .length           = L4_44XX_SIZE,
            .type       = MT_DEVICE,
      },
      {
            .virtual    = OMAP44XX_GPMC_VIRT,
            .pfn        = __phys_to_pfn(OMAP44XX_GPMC_PHYS),
            .length           = OMAP44XX_GPMC_SIZE,
            .type       = MT_DEVICE,
      },
      {
            .virtual    = OMAP44XX_EMIF1_VIRT,
            .pfn        = __phys_to_pfn(OMAP44XX_EMIF1_PHYS),
            .length           = OMAP44XX_EMIF1_SIZE,
            .type       = MT_DEVICE,
      },
      {
            .virtual    = OMAP44XX_EMIF2_VIRT,
            .pfn        = __phys_to_pfn(OMAP44XX_EMIF2_PHYS),
            .length           = OMAP44XX_EMIF2_SIZE,
            .type       = MT_DEVICE,
      },
      {
            .virtual    = OMAP44XX_DMM_VIRT,
            .pfn        = __phys_to_pfn(OMAP44XX_DMM_PHYS),
            .length           = OMAP44XX_DMM_SIZE,
            .type       = MT_DEVICE,
      },
      {
            .virtual    = L4_PER_44XX_VIRT,
            .pfn        = __phys_to_pfn(L4_PER_44XX_PHYS),
            .length           = L4_PER_44XX_SIZE,
            .type       = MT_DEVICE,
      },
      {
            .virtual    = L4_EMU_44XX_VIRT,
            .pfn        = __phys_to_pfn(L4_EMU_44XX_PHYS),
            .length           = L4_EMU_44XX_SIZE,
            .type       = MT_DEVICE,
      },
};
#endif

static void __init _omap2_map_common_io(void)
{
      /* Normally devicemaps_init() would flush caches and tlb after
       * mdesc->map_io(), but we must also do it here because of the CPU
       * revision check below.
       */
      local_flush_tlb_all();
      flush_cache_all();

      omap2_check_revision();
      omap_sram_init();
}

#ifdef CONFIG_ARCH_OMAP2420
void __init omap242x_map_common_io(void)
{
      iotable_init(omap24xx_io_desc, ARRAY_SIZE(omap24xx_io_desc));
      iotable_init(omap242x_io_desc, ARRAY_SIZE(omap242x_io_desc));
      _omap2_map_common_io();
}
#endif

#ifdef CONFIG_ARCH_OMAP2430
void __init omap243x_map_common_io(void)
{
      iotable_init(omap24xx_io_desc, ARRAY_SIZE(omap24xx_io_desc));
      iotable_init(omap243x_io_desc, ARRAY_SIZE(omap243x_io_desc));
      _omap2_map_common_io();
}
#endif

#ifdef CONFIG_ARCH_OMAP3
void __init omap34xx_map_common_io(void)
{
      iotable_init(omap34xx_io_desc, ARRAY_SIZE(omap34xx_io_desc));
      _omap2_map_common_io();
}
#endif

#ifdef CONFIG_ARCH_OMAP4
void __init omap44xx_map_common_io(void)
{
      iotable_init(omap44xx_io_desc, ARRAY_SIZE(omap44xx_io_desc));
      _omap2_map_common_io();
}
#endif

/*
 * omap2_init_reprogram_sdrc - reprogram SDRC timing parameters
 *
 * Sets the CORE DPLL3 M2 divider to the same value that it's at
 * currently.  This has the effect of setting the SDRC SDRAM AC timing
 * registers to the values currently defined by the kernel.  Currently
 * only defined for OMAP3; will return 0 if called on OMAP2.  Returns
 * -EINVAL if the dpll3_m2_ck cannot be found, 0 if called on OMAP2,
 * or passes along the return value of clk_set_rate().
 */
static int __init _omap2_init_reprogram_sdrc(void)
{
      struct clk *dpll3_m2_ck;
      int v = -EINVAL;
      long rate;

      if (!cpu_is_omap34xx())
            return 0;

      dpll3_m2_ck = clk_get(NULL, "dpll3_m2_ck");
      if (IS_ERR(dpll3_m2_ck))
            return -EINVAL;

      rate = clk_get_rate(dpll3_m2_ck);
      pr_info("Reprogramming SDRC clock to %ld Hz\n", rate);
      v = clk_set_rate(dpll3_m2_ck, rate);
      if (v)
            pr_err("dpll3_m2_clk rate change failed: %d\n", v);

      clk_put(dpll3_m2_ck);

      return v;
}

static int _set_hwmod_postsetup_state(struct omap_hwmod *oh, void *data)
{
      return omap_hwmod_set_postsetup_state(oh, *(u8 *)data);
}

/*
 * Initialize asm_irq_base for entry-macro.S
 */
static inline void omap_irq_base_init(void)
{
      extern void __iomem *omap_irq_base;

#ifdef MULTI_OMAP2
      if (cpu_is_omap24xx())
            omap_irq_base = OMAP2_L4_IO_ADDRESS(OMAP24XX_IC_BASE);
      else if (cpu_is_omap34xx())
            omap_irq_base = OMAP2_L4_IO_ADDRESS(OMAP34XX_IC_BASE);
      else if (cpu_is_omap44xx())
            omap_irq_base = OMAP2_L4_IO_ADDRESS(OMAP44XX_GIC_CPU_BASE);
      else
            pr_err("Could not initialize omap_irq_base\n");
#endif
}

void __init omap2_init_common_infrastructure(void)
{
      u8 postsetup_state;

      if (cpu_is_omap242x()) {
            omap2xxx_powerdomains_init();
            omap2_clockdomains_init();
            omap2420_hwmod_init();
      } else if (cpu_is_omap243x()) {
            omap2xxx_powerdomains_init();
            omap2_clockdomains_init();
            omap2430_hwmod_init();
      } else if (cpu_is_omap34xx()) {
            omap3xxx_powerdomains_init();
            omap2_clockdomains_init();
            omap3xxx_hwmod_init();
      } else if (cpu_is_omap44xx()) {
            omap44xx_powerdomains_init();
            omap44xx_clockdomains_init();
            omap44xx_hwmod_init();
      } else {
            pr_err("Could not init hwmod data - unknown SoC\n");
        }

      /* Set the default postsetup state for all hwmods */
#ifdef CONFIG_PM_RUNTIME
      postsetup_state = _HWMOD_STATE_IDLE;
#else
      postsetup_state = _HWMOD_STATE_ENABLED;
#endif
      omap_hwmod_for_each(_set_hwmod_postsetup_state, &postsetup_state);

      /*
       * Set the default postsetup state for unusual modules (like
       * MPU WDT).
       *
       * The postsetup_state is not actually used until
       * omap_hwmod_late_init(), so boards that desire full watchdog
       * coverage of kernel initialization can reprogram the
       * postsetup_state between the calls to
       * omap2_init_common_infra() and omap2_init_common_devices().
       *
       * XXX ideally we could detect whether the MPU WDT was currently
       * enabled here and make this conditional
       */
      postsetup_state = _HWMOD_STATE_DISABLED;
      omap_hwmod_for_each_by_class("wd_timer",
                             _set_hwmod_postsetup_state,
                             &postsetup_state);

      omap_pm_if_early_init();

      if (cpu_is_omap2420())
            omap2420_clk_init();
      else if (cpu_is_omap2430())
            omap2430_clk_init();
      else if (cpu_is_omap34xx())
            omap3xxx_clk_init();
      else if (cpu_is_omap44xx())
            omap4xxx_clk_init();
      else
            pr_err("Could not init clock framework - unknown SoC\n");
}

void __init omap2_init_common_devices(struct omap_sdrc_params *sdrc_cs0,
                              struct omap_sdrc_params *sdrc_cs1)
{
      omap_serial_early_init();

      omap_hwmod_late_init();

      if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
            omap2_sdrc_init(sdrc_cs0, sdrc_cs1);
            _omap2_init_reprogram_sdrc();
      }
      gpmc_init();

      omap_irq_base_init();
}

/*
 * NOTE: Please use ioremap + __raw_read/write where possible instead of these
 */

u8 omap_readb(u32 pa)
{
      return __raw_readb(OMAP2_L4_IO_ADDRESS(pa));
}
EXPORT_SYMBOL(omap_readb);

u16 omap_readw(u32 pa)
{
      return __raw_readw(OMAP2_L4_IO_ADDRESS(pa));
}
EXPORT_SYMBOL(omap_readw);

u32 omap_readl(u32 pa)
{
      return __raw_readl(OMAP2_L4_IO_ADDRESS(pa));
}
EXPORT_SYMBOL(omap_readl);

void omap_writeb(u8 v, u32 pa)
{
      __raw_writeb(v, OMAP2_L4_IO_ADDRESS(pa));
}
EXPORT_SYMBOL(omap_writeb);

void omap_writew(u16 v, u32 pa)
{
      __raw_writew(v, OMAP2_L4_IO_ADDRESS(pa));
}
EXPORT_SYMBOL(omap_writew);

void omap_writel(u32 v, u32 pa)
{
      __raw_writel(v, OMAP2_L4_IO_ADDRESS(pa));
}
EXPORT_SYMBOL(omap_writel);

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