diff options
Diffstat (limited to 'arch/arm/plat-s5p/sysmmu.c')
| -rw-r--r-- | arch/arm/plat-s5p/sysmmu.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/arch/arm/plat-s5p/sysmmu.c b/arch/arm/plat-s5p/sysmmu.c new file mode 100644 index 00000000000..d804914dc2e --- /dev/null +++ b/arch/arm/plat-s5p/sysmmu.c @@ -0,0 +1,328 @@ +/* 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); |