Logo Search packages:      
Sourcecode: linux version File versions

cpm_common.c

/*
 * Common CPM code
 *
 * Author: Scott Wood <scottwood@freescale.com>
 *
 * Copyright 2007 Freescale Semiconductor, Inc.
 *
 * Some parts derived from commproc.c/cpm2_common.c, which is:
 * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
 * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
 * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
 * 2006 (c) MontaVista Software, Inc.
 * Vitaly Bordug <vbordug@ru.mvista.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/of_device.h>
#include <linux/spinlock.h>
#include <linux/of.h>

#include <asm/udbg.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/rheap.h>
#include <asm/cpm.h>

#include <mm/mmu_decl.h>

#if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
#include <linux/of_gpio.h>
#endif

#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
static u32 __iomem *cpm_udbg_txdesc =
      (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;

static void udbg_putc_cpm(char c)
{
      u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);

      if (c == '\n')
            udbg_putc_cpm('\r');

      while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
            ;

      out_8(txbuf, c);
      out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
}

void __init udbg_init_cpm(void)
{
      if (cpm_udbg_txdesc) {
#ifdef CONFIG_CPM2
            setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO);
#endif
            udbg_putc = udbg_putc_cpm;
      }
}
#endif

static spinlock_t cpm_muram_lock;
static rh_block_t cpm_boot_muram_rh_block[16];
static rh_info_t cpm_muram_info;
static u8 __iomem *muram_vbase;
static phys_addr_t muram_pbase;

/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS     4

int __init cpm_muram_init(void)
{
      struct device_node *np;
      struct resource r;
      u32 zero[OF_MAX_ADDR_CELLS] = {};
      resource_size_t max = 0;
      int i = 0;
      int ret = 0;

      spin_lock_init(&cpm_muram_lock);
      /* initialize the info header */
      rh_init(&cpm_muram_info, 1,
              sizeof(cpm_boot_muram_rh_block) /
              sizeof(cpm_boot_muram_rh_block[0]),
              cpm_boot_muram_rh_block);

      np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
      if (!np) {
            /* try legacy bindings */
            np = of_find_node_by_name(NULL, "data-only");
            if (!np) {
                  printk(KERN_ERR "Cannot find CPM muram data node");
                  ret = -ENODEV;
                  goto out;
            }
      }

      muram_pbase = of_translate_address(np, zero);
      if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
            printk(KERN_ERR "Cannot translate zero through CPM muram node");
            ret = -ENODEV;
            goto out;
      }

      while (of_address_to_resource(np, i++, &r) == 0) {
            if (r.end > max)
                  max = r.end;

            rh_attach_region(&cpm_muram_info, r.start - muram_pbase,
                             r.end - r.start + 1);
      }

      muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
      if (!muram_vbase) {
            printk(KERN_ERR "Cannot map CPM muram");
            ret = -ENOMEM;
      }

out:
      of_node_put(np);
      return ret;
}

/**
 * cpm_muram_alloc - allocate the requested size worth of multi-user ram
 * @size: number of bytes to allocate
 * @align: requested alignment, in bytes
 *
 * This function returns an offset into the muram area.
 * Use cpm_dpram_addr() to get the virtual address of the area.
 * Use cpm_muram_free() to free the allocation.
 */
unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
{
      unsigned long start;
      unsigned long flags;

      spin_lock_irqsave(&cpm_muram_lock, flags);
      cpm_muram_info.alignment = align;
      start = rh_alloc(&cpm_muram_info, size, "commproc");
      spin_unlock_irqrestore(&cpm_muram_lock, flags);

      return start;
}
EXPORT_SYMBOL(cpm_muram_alloc);

/**
 * cpm_muram_free - free a chunk of multi-user ram
 * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
 */
int cpm_muram_free(unsigned long offset)
{
      int ret;
      unsigned long flags;

      spin_lock_irqsave(&cpm_muram_lock, flags);
      ret = rh_free(&cpm_muram_info, offset);
      spin_unlock_irqrestore(&cpm_muram_lock, flags);

      return ret;
}
EXPORT_SYMBOL(cpm_muram_free);

/**
 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
 * @offset: the offset into the muram area to reserve
 * @size: the number of bytes to reserve
 *
 * This function returns "start" on success, -ENOMEM on failure.
 * Use cpm_dpram_addr() to get the virtual address of the area.
 * Use cpm_muram_free() to free the allocation.
 */
unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
{
      unsigned long start;
      unsigned long flags;

      spin_lock_irqsave(&cpm_muram_lock, flags);
      cpm_muram_info.alignment = 1;
      start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc");
      spin_unlock_irqrestore(&cpm_muram_lock, flags);

      return start;
}
EXPORT_SYMBOL(cpm_muram_alloc_fixed);

/**
 * cpm_muram_addr - turn a muram offset into a virtual address
 * @offset: muram offset to convert
 */
void __iomem *cpm_muram_addr(unsigned long offset)
{
      return muram_vbase + offset;
}
EXPORT_SYMBOL(cpm_muram_addr);

unsigned long cpm_muram_offset(void __iomem *addr)
{
      return addr - (void __iomem *)muram_vbase;
}
EXPORT_SYMBOL(cpm_muram_offset);

/**
 * cpm_muram_dma - turn a muram virtual address into a DMA address
 * @offset: virtual address from cpm_muram_addr() to convert
 */
dma_addr_t cpm_muram_dma(void __iomem *addr)
{
      return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
}
EXPORT_SYMBOL(cpm_muram_dma);

#if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)

struct cpm2_ioports {
      u32 dir, par, sor, odr, dat;
      u32 res[3];
};

struct cpm2_gpio32_chip {
      struct of_mm_gpio_chip mm_gc;
      spinlock_t lock;

      /* shadowed data register to clear/set bits safely */
      u32 cpdata;
};

static inline struct cpm2_gpio32_chip *
to_cpm2_gpio32_chip(struct of_mm_gpio_chip *mm_gc)
{
      return container_of(mm_gc, struct cpm2_gpio32_chip, mm_gc);
}

static void cpm2_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc)
{
      struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
      struct cpm2_ioports __iomem *iop = mm_gc->regs;

      cpm2_gc->cpdata = in_be32(&iop->dat);
}

static int cpm2_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct cpm2_ioports __iomem *iop = mm_gc->regs;
      u32 pin_mask;

      pin_mask = 1 << (31 - gpio);

      return !!(in_be32(&iop->dat) & pin_mask);
}

static void __cpm2_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask,
      int value)
{
      struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
      struct cpm2_ioports __iomem *iop = mm_gc->regs;

      if (value)
            cpm2_gc->cpdata |= pin_mask;
      else
            cpm2_gc->cpdata &= ~pin_mask;

      out_be32(&iop->dat, cpm2_gc->cpdata);
}

static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
      unsigned long flags;
      u32 pin_mask = 1 << (31 - gpio);

      spin_lock_irqsave(&cpm2_gc->lock, flags);

      __cpm2_gpio32_set(mm_gc, pin_mask, value);

      spin_unlock_irqrestore(&cpm2_gc->lock, flags);
}

static int cpm2_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
      struct cpm2_ioports __iomem *iop = mm_gc->regs;
      unsigned long flags;
      u32 pin_mask = 1 << (31 - gpio);

      spin_lock_irqsave(&cpm2_gc->lock, flags);

      setbits32(&iop->dir, pin_mask);
      __cpm2_gpio32_set(mm_gc, pin_mask, val);

      spin_unlock_irqrestore(&cpm2_gc->lock, flags);

      return 0;
}

static int cpm2_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
      struct cpm2_ioports __iomem *iop = mm_gc->regs;
      unsigned long flags;
      u32 pin_mask = 1 << (31 - gpio);

      spin_lock_irqsave(&cpm2_gc->lock, flags);

      clrbits32(&iop->dir, pin_mask);

      spin_unlock_irqrestore(&cpm2_gc->lock, flags);

      return 0;
}

int cpm2_gpiochip_add32(struct device_node *np)
{
      struct cpm2_gpio32_chip *cpm2_gc;
      struct of_mm_gpio_chip *mm_gc;
      struct of_gpio_chip *of_gc;
      struct gpio_chip *gc;

      cpm2_gc = kzalloc(sizeof(*cpm2_gc), GFP_KERNEL);
      if (!cpm2_gc)
            return -ENOMEM;

      spin_lock_init(&cpm2_gc->lock);

      mm_gc = &cpm2_gc->mm_gc;
      of_gc = &mm_gc->of_gc;
      gc = &of_gc->gc;

      mm_gc->save_regs = cpm2_gpio32_save_regs;
      of_gc->gpio_cells = 2;
      gc->ngpio = 32;
      gc->direction_input = cpm2_gpio32_dir_in;
      gc->direction_output = cpm2_gpio32_dir_out;
      gc->get = cpm2_gpio32_get;
      gc->set = cpm2_gpio32_set;

      return of_mm_gpiochip_add(np, mm_gc);
}
#endif /* CONFIG_CPM2 || CONFIG_8xx_GPIO */

Generated by  Doxygen 1.6.0   Back to index