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sysmmu.c

/* linux/arch/arm/plat-s5p/sysmmu.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *          http://www.samsung.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/io.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>

#include <mach/map.h>
#include <mach/regs-sysmmu.h>
#include <mach/sysmmu.h>

#include <plat/sysmmu.h>

struct sysmmu_controller s5p_sysmmu_cntlrs[S5P_SYSMMU_TOTAL_IPNUM];

void s5p_sysmmu_register(struct sysmmu_controller *sysmmuconp)
{
      unsigned int reg_mmu_ctrl;
      unsigned int reg_mmu_status;
      unsigned int reg_pt_base_addr;
      unsigned int reg_int_status;
      unsigned int reg_page_ft_addr;

      reg_int_status = __raw_readl(sysmmuconp->regs + S5P_INT_STATUS);
      reg_mmu_ctrl = __raw_readl(sysmmuconp->regs + S5P_MMU_CTRL);
      reg_mmu_status = __raw_readl(sysmmuconp->regs + S5P_MMU_STATUS);
      reg_pt_base_addr = __raw_readl(sysmmuconp->regs + S5P_PT_BASE_ADDR);
      reg_page_ft_addr = __raw_readl(sysmmuconp->regs + S5P_PAGE_FAULT_ADDR);

      printk(KERN_INFO "%s: ips:%s\n", __func__, sysmmuconp->name);
      printk(KERN_INFO "%s: MMU_CTRL:0x%X, ", __func__, reg_mmu_ctrl);
      printk(KERN_INFO "MMU_STATUS:0x%X, PT_BASE_ADDR:0x%X\n", reg_mmu_status, reg_pt_base_addr);
      printk(KERN_INFO "%s: INT_STATUS:0x%X, PAGE_FAULT_ADDR:0x%X\n", __func__, reg_int_status, reg_page_ft_addr);

      switch (reg_int_status & 0xFF) {
      case 0x1:
            printk(KERN_INFO "%s: Page fault\n", __func__);
            printk(KERN_INFO "%s: Virtual address causing last page fault or bus error : 0x%x\n", __func__ , reg_page_ft_addr);
            break;
      case 0x2:
            printk(KERN_INFO "%s: AR multi-hit fault\n", __func__);
            break;
      case 0x4:
            printk(KERN_INFO "%s: AW multi-hit fault\n", __func__);
            break;
      case 0x8:
            printk(KERN_INFO "%s: Bus error\n", __func__);
            break;
      case 0x10:
            printk(KERN_INFO "%s: AR Security protection fault\n", __func__);
            break;
      case 0x20:
            printk(KERN_INFO "%s: AR Access protection fault\n", __func__);
            break;
      case 0x40:
            printk(KERN_INFO "%s: AW Security protection fault\n", __func__);
            break;
      case 0x80:
            printk(KERN_INFO "%s: AW Access protection fault\n", __func__);
            break;
      }
}

static irqreturn_t s5p_sysmmu_irq(int irq, void *dev_id)
{
      unsigned int i;
      unsigned int reg_int_status;
      struct sysmmu_controller *sysmmuconp;

      for (i = 0; i < S5P_SYSMMU_TOTAL_IPNUM; i++) {
            sysmmuconp = &s5p_sysmmu_cntlrs[i];

            if (sysmmuconp->enable == true) {
                  reg_int_status = __raw_readl(sysmmuconp->regs + S5P_INT_STATUS);

                  if (reg_int_status & 0xFF)
                        s5p_sysmmu_register(sysmmuconp);
            }
      }
      return IRQ_HANDLED;
}

int s5p_sysmmu_set_tablebase_pgd(sysmmu_ips ips, unsigned long pgd)
{
      struct sysmmu_controller *sysmmuconp = NULL;

      sysmmuconp = &s5p_sysmmu_cntlrs[ips];

      if (sysmmuconp == NULL) {
            printk(KERN_ERR "failed to get ip's sysmmu info\n");
            return 1;
      }

      /* Set sysmmu page table base address */
      __raw_writel(pgd, sysmmuconp->regs + S5P_PT_BASE_ADDR);

      if (s5p_sysmmu_tlb_invalidate(ips) != 0)
            printk(KERN_ERR "failed s5p_sysmmu_tlb_invalidate\n");

      return 0;
}

static int s5p_sysmmu_set_tablebase(sysmmu_ips ips)
{
      unsigned int pg;
      struct sysmmu_controller *sysmmuconp;

      sysmmuconp = &s5p_sysmmu_cntlrs[ips];

      if (sysmmuconp == NULL) {
            printk(KERN_ERR "failed to get ip's sysmmu info\n");
            return 1;
      }

      __asm__("mrc      p15, 0, %0, c2, c0, 0"  \
            : "=r" (pg) : : "cc");        \
            pg &= ~0x3fff;

      sysmmu_debug("CP15 TTBR0 : 0x%x\n", pg);

      /* Set sysmmu page table base address */
      __raw_writel(pg, sysmmuconp->regs + S5P_PT_BASE_ADDR);

      return 0;
}

int s5p_sysmmu_enable(sysmmu_ips ips)
{
      unsigned int reg;

      struct sysmmu_controller *sysmmuconp;

      sysmmuconp = &s5p_sysmmu_cntlrs[ips];

      if (sysmmuconp == NULL) {
            printk(KERN_ERR "failed to get ip's sysmmu info\n");
            return 1;
      }

      s5p_sysmmu_set_tablebase(ips);

      /* replacement policy : LRU */
      reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CFG);
      reg |= 0x1;
      __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CFG);

      /* Enable interrupt, Enable MMU */
      reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CTRL);
      reg |= (0x1 << 2) | (0x1 << 0);

      __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CTRL);

      sysmmuconp->enable = true;

      return 0;
}

int s5p_sysmmu_disable(sysmmu_ips ips)
{
      unsigned int reg;

      struct sysmmu_controller *sysmmuconp = NULL;

      if (ips > S5P_SYSMMU_TOTAL_IPNUM)
            printk(KERN_ERR "failed to get ips parameter\n");

      sysmmuconp = &s5p_sysmmu_cntlrs[ips];

      if (sysmmuconp == NULL) {
            printk(KERN_ERR "failed to get ip's sysmmu info\n");
            return 1;
      }

      reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CFG);

      /* replacement policy : LRU */
      reg |= 0x1;
      __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CFG);

      reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CTRL);

      /* Disable MMU */
      reg &= ~0x1;
      __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CTRL);

      sysmmuconp->enable = false;

      return 0;
}

int s5p_sysmmu_tlb_invalidate(sysmmu_ips ips)
{
      unsigned int reg;
      struct sysmmu_controller *sysmmuconp = NULL;

      sysmmuconp = &s5p_sysmmu_cntlrs[ips];

      if (sysmmuconp == NULL) {
            printk(KERN_ERR "failed to get ip's sysmmu info\n");
            return 1;
      }

      /* set Block MMU for flush TLB */
      reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CTRL);
      reg |= 0x1 << 1;
      __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CTRL);

      /* flush all TLB entry */
      __raw_writel(0x1, sysmmuconp->regs + S5P_MMU_FLUSH);

      /* set Un-block MMU after flush TLB */
      reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CTRL);
      reg &= ~(0x1 << 1);
      __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CTRL);

      return 0;
}

static int s5p_sysmmu_probe(struct platform_device *pdev)
{
      int i;
      int ret;
      struct resource *res;
      struct sysmmu_controller *sysmmuconp;
      sysmmu_ips ips;

      for (i = 0; i < S5P_SYSMMU_TOTAL_IPNUM; i++) {
            sysmmuconp = &s5p_sysmmu_cntlrs[i];
            if (sysmmuconp == NULL) {
                  printk(KERN_ERR "failed to get ip's sysmmu info\n");
                  ret = -ENOENT;
                  goto err_res;
            }

            sysmmuconp->name = sysmmu_ips_name[i];

            res = platform_get_resource(pdev, IORESOURCE_MEM, i);
            if (!res) {
                  printk(KERN_ERR "failed to get sysmmu resource\n");
                  ret = -ENODEV;
                  goto err_res;
            }

            sysmmuconp->mem = request_mem_region(res->start,
                        ((res->end) - (res->start)) + 1, pdev->name);
            if (!sysmmuconp->mem) {
                  pr_err("failed to request sysmmu memory region\n");
                  ret = -EBUSY;
                  goto err_res;
            }

            sysmmuconp->regs = ioremap(res->start, res->end - res->start + 1);
            if (!sysmmuconp->regs) {
                  pr_err("failed to sysmmu ioremap\n");
                  ret = -ENXIO;
                  goto err_reg;
            }

            sysmmuconp->irq = platform_get_irq(pdev, i);
            if (sysmmuconp->irq <= 0) {
                  pr_err("failed to get sysmmu irq resource\n");
                  ret = -ENOENT;
                  goto err_map;
            }

            ret = request_irq(sysmmuconp->irq, s5p_sysmmu_irq, IRQF_DISABLED, pdev->name, sysmmuconp);
            if (ret) {
                  pr_err("failed to request irq\n");
                  ret = -ENOENT;
                  goto err_map;
            }

            ips = (sysmmu_ips)i;

            sysmmuconp->ips = ips;
      }

      return 0;

err_reg:
      release_mem_region((resource_size_t)sysmmuconp->mem, (resource_size_t)((res->end) - (res->start) + 1));
err_map:
      iounmap(sysmmuconp->regs);
err_res:
      return ret;
}

static int s5p_sysmmu_remove(struct platform_device *pdev)
{
      return 0;
}
int s5p_sysmmu_runtime_suspend(struct device *dev)
{
      return 0;
}

int s5p_sysmmu_runtime_resume(struct device *dev)
{
      return 0;
}

const struct dev_pm_ops s5p_sysmmu_pm_ops = {
      .runtime_suspend  = s5p_sysmmu_runtime_suspend,
      .runtime_resume         = s5p_sysmmu_runtime_resume,
};

static struct platform_driver s5p_sysmmu_driver = {
      .probe            = s5p_sysmmu_probe,
      .remove           = s5p_sysmmu_remove,
      .driver           = {
            .owner            = THIS_MODULE,
            .name       = "s5p-sysmmu",
            .pm         = &s5p_sysmmu_pm_ops,
      }
};

static int __init s5p_sysmmu_init(void)
{
      return platform_driver_register(&s5p_sysmmu_driver);
}
arch_initcall(s5p_sysmmu_init);

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