arch/arm/plat-s5p/sysmmu.c

   1 /* linux/arch/arm/plat-s5p/sysmmu.c
   2  *
   3  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/io.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/platform_device.h>
  14
  15 #include <mach/map.h>
  16 #include <mach/regs-sysmmu.h>
  17 #include <mach/sysmmu.h>
  18
  19 struct sysmmu_controller s5p_sysmmu_cntlrs[S5P_SYSMMU_TOTAL_IPNUM];
  20
  21 void s5p_sysmmu_register(struct sysmmu_controller *sysmmuconp)
  22 {
  23         unsigned int reg_mmu_ctrl;
  24         unsigned int reg_mmu_status;
  25         unsigned int reg_pt_base_addr;
  26         unsigned int reg_int_status;
  27         unsigned int reg_page_ft_addr;
  28
  29         reg_int_status = __raw_readl(sysmmuconp->regs + S5P_INT_STATUS);
  30         reg_mmu_ctrl = __raw_readl(sysmmuconp->regs + S5P_MMU_CTRL);
  31         reg_mmu_status = __raw_readl(sysmmuconp->regs + S5P_MMU_STATUS);
  32         reg_pt_base_addr = __raw_readl(sysmmuconp->regs + S5P_PT_BASE_ADDR);
  33         reg_page_ft_addr = __raw_readl(sysmmuconp->regs + S5P_PAGE_FAULT_ADDR);
  34
  35         printk(KERN_INFO "%s: ips:%s\n", __func__, sysmmuconp->name);
  36         printk(KERN_INFO "%s: MMU_CTRL:0x%X, ", __func__, reg_mmu_ctrl);
  37         printk(KERN_INFO "MMU_STATUS:0x%X, PT_BASE_ADDR:0x%X\n", reg_mmu_status, reg_pt_base_addr);
  38         printk(KERN_INFO "%s: INT_STATUS:0x%X, PAGE_FAULT_ADDR:0x%X\n", __func__, reg_int_status, reg_page_ft_addr);
  39
  40         switch (reg_int_status & 0xFF) {
  41         case 0x1:
  42                 printk(KERN_INFO "%s: Page fault\n", __func__);
  43                 printk(KERN_INFO "%s: Virtual address causing last page fault or bus error : 0x%x\n", __func__ , reg_page_ft_addr);
  44                 break;
  45         case 0x2:
  46                 printk(KERN_INFO "%s: AR multi-hit fault\n", __func__);
  47                 break;
  48         case 0x4:
  49                 printk(KERN_INFO "%s: AW multi-hit fault\n", __func__);
  50                 break;
  51         case 0x8:
  52                 printk(KERN_INFO "%s: Bus error\n", __func__);
  53                 break;
  54         case 0x10:
  55                 printk(KERN_INFO "%s: AR Security protection fault\n", __func__);
  56                 break;
  57         case 0x20:
  58                 printk(KERN_INFO "%s: AR Access protection fault\n", __func__);
  59                 break;
  60         case 0x40:
  61                 printk(KERN_INFO "%s: AW Security protection fault\n", __func__);
  62                 break;
  63         case 0x80:
  64                 printk(KERN_INFO "%s: AW Access protection fault\n", __func__);
  65                 break;
  66         }
  67 }
  68
  69 static irqreturn_t s5p_sysmmu_irq(int irq, void *dev_id)
  70 {
  71         unsigned int i;
  72         unsigned int reg_int_status;
  73         struct sysmmu_controller *sysmmuconp;
  74
  75         for (i = 0; i < S5P_SYSMMU_TOTAL_IPNUM; i++) {
  76                 sysmmuconp = &s5p_sysmmu_cntlrs[i];
  77
  78                 if (sysmmuconp->enable == true) {
  79                         reg_int_status = __raw_readl(sysmmuconp->regs + S5P_INT_STATUS);
  80
  81                         if (reg_int_status & 0xFF)
  82                                 s5p_sysmmu_register(sysmmuconp);
  83                 }
  84         }
  85         return IRQ_HANDLED;
  86 }
  87
  88 int s5p_sysmmu_set_tablebase_pgd(sysmmu_ips ips, unsigned long pgd)
  89 {
  90         struct sysmmu_controller *sysmmuconp = NULL;
  91
  92         sysmmuconp = &s5p_sysmmu_cntlrs[ips];
  93
  94         if (sysmmuconp == NULL) {
  95                 printk(KERN_ERR "failed to get ip's sysmmu info\n");
  96                 return 1;
  97         }
  98
  99         /* Set sysmmu page table base address */
 100         __raw_writel(pgd, sysmmuconp->regs + S5P_PT_BASE_ADDR);
 101
 102         if (s5p_sysmmu_tlb_invalidate(ips) != 0)
 103                 printk(KERN_ERR "failed s5p_sysmmu_tlb_invalidate\n");
 104
 105         return 0;
 106 }
 107
 108 static int s5p_sysmmu_set_tablebase(sysmmu_ips ips)
 109 {
 110         unsigned int pg;
 111         struct sysmmu_controller *sysmmuconp;
 112
 113         sysmmuconp = &s5p_sysmmu_cntlrs[ips];
 114
 115         if (sysmmuconp == NULL) {
 116                 printk(KERN_ERR "failed to get ip's sysmmu info\n");
 117                 return 1;
 118         }
 119
 120         __asm__("mrc    p15, 0, %0, c2, c0, 0"  \
 121                 : "=r" (pg) : : "cc");          \
 122                 pg &= ~0x3fff;
 123
 124         printk(KERN_INFO "%s: CP15 TTBR0 : 0x%x\n", __func__, pg);
 125
 126         /* Set sysmmu page table base address */
 127         __raw_writel(pg, sysmmuconp->regs + S5P_PT_BASE_ADDR);
 128
 129         return 0;
 130 }
 131
 132 int s5p_sysmmu_enable(sysmmu_ips ips)
 133 {
 134         unsigned int reg;
 135
 136         struct sysmmu_controller *sysmmuconp;
 137
 138         sysmmuconp = &s5p_sysmmu_cntlrs[ips];
 139
 140         if (sysmmuconp == NULL) {
 141                 printk(KERN_ERR "failed to get ip's sysmmu info\n");
 142                 return 1;
 143         }
 144
 145         s5p_sysmmu_set_tablebase(ips);
 146
 147         /* replacement policy : LRU */
 148         reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CFG);
 149         reg |= 0x1;
 150         __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CFG);
 151
 152         /* Enable interrupt, Enable MMU */
 153         reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CTRL);
 154         reg |= (0x1 << 2) | (0x1 << 0);
 155
 156         __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CTRL);
 157
 158         sysmmuconp->enable = true;
 159
 160         return 0;
 161 }
 162
 163 int s5p_sysmmu_disable(sysmmu_ips ips)
 164 {
 165         unsigned int reg;
 166
 167         struct sysmmu_controller *sysmmuconp = NULL;
 168
 169         if (ips > S5P_SYSMMU_TOTAL_IPNUM)
 170                 printk(KERN_ERR "failed to get ips parameter\n");
 171
 172         sysmmuconp = &s5p_sysmmu_cntlrs[ips];
 173
 174         if (sysmmuconp == NULL) {
 175                 printk(KERN_ERR "failed to get ip's sysmmu info\n");
 176                 return 1;
 177         }
 178
 179         reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CFG);
 180
 181         /* replacement policy : LRU */
 182         reg |= 0x1;
 183         __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CFG);
 184
 185         reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CTRL);
 186
 187         /* Disable MMU */
 188         reg &= ~0x1;
 189         __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CTRL);
 190
 191         sysmmuconp->enable = false;
 192
 193         return 0;
 194 }
 195
 196 int s5p_sysmmu_tlb_invalidate(sysmmu_ips ips)
 197 {
 198         unsigned int reg;
 199         struct sysmmu_controller *sysmmuconp = NULL;
 200
 201         sysmmuconp = &s5p_sysmmu_cntlrs[ips];
 202
 203         if (sysmmuconp == NULL) {
 204                 printk(KERN_ERR "failed to get ip's sysmmu info\n");
 205                 return 1;
 206         }
 207
 208         /* set Block MMU for flush TLB */
 209         reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CTRL);
 210         reg |= 0x1 << 1;
 211         __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CTRL);
 212
 213         /* flush all TLB entry */
 214         __raw_writel(0x1, sysmmuconp->regs + S5P_MMU_FLUSH);
 215
 216         /* set Un-block MMU after flush TLB */
 217         reg = __raw_readl(sysmmuconp->regs + S5P_MMU_CTRL);
 218         reg &= ~(0x1 << 1);
 219         __raw_writel(reg, sysmmuconp->regs + S5P_MMU_CTRL);
 220
 221         return 0;
 222 }
 223
 224 static int s5p_sysmmu_probe(struct platform_device *pdev)
 225 {
 226         int i;
 227         int ret;
 228         struct resource *res;
 229         struct sysmmu_controller *sysmmuconp;
 230         sysmmu_ips ips;
 231
 232         for (i = 0; i < S5P_SYSMMU_TOTAL_IPNUM; i++) {
 233                 sysmmuconp = &s5p_sysmmu_cntlrs[i];
 234                 if (sysmmuconp == NULL) {
 235                         printk(KERN_ERR "failed to get ip's sysmmu info\n");
 236                         ret = -ENOENT;
 237                         goto err_res;
 238                 }
 239
 240                 sysmmuconp->name = sysmmu_ips_name[i];
 241
 242                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 243                 if (!res) {
 244                         printk(KERN_ERR "failed to get sysmmu resource\n");
 245                         ret = -ENODEV;
 246                         goto err_res;
 247                 }
 248
 249                 sysmmuconp->mem = request_mem_region(res->start,
 250                                 ((res->end) - (res->start)) + 1, pdev->name);
 251                 if (!sysmmuconp->mem) {
 252                         pr_err("failed to request sysmmu memory region\n");
 253                         ret = -EBUSY;
 254                         goto err_res;
 255                 }
 256
 257                 sysmmuconp->regs = ioremap(res->start, res->end - res->start + 1);
 258                 if (!sysmmuconp->regs) {
 259                         pr_err("failed to sysmmu ioremap\n");
 260                         ret = -ENXIO;
 261                         goto err_reg;
 262                 }
 263
 264                 sysmmuconp->irq = platform_get_irq(pdev, i);
 265                 if (sysmmuconp->irq <= 0) {
 266                         pr_err("failed to get sysmmu irq resource\n");
 267                         ret = -ENOENT;
 268                         goto err_map;
 269                 }
 270
 271                 ret = request_irq(sysmmuconp->irq, s5p_sysmmu_irq, IRQF_DISABLED, pdev->name, sysmmuconp);
 272                 if (ret) {
 273                         pr_err("failed to request irq\n");
 274                         ret = -ENOENT;
 275                         goto err_map;
 276                 }
 277
 278                 ips = (sysmmu_ips)i;
 279
 280                 sysmmuconp->ips = ips;
 281         }
 282
 283         return 0;
 284
 285 err_reg:
 286         release_mem_region((resource_size_t)sysmmuconp->mem, (resource_size_t)((res->end) - (res->start) + 1));
 287 err_map:
 288         iounmap(sysmmuconp->regs);
 289 err_res:
 290         return ret;
 291 }
 292
 293 static int s5p_sysmmu_remove(struct platform_device *pdev)
 294 {
 295         return 0;
 296 }
 297 int s5p_sysmmu_runtime_suspend(struct device *dev)
 298 {
 299         return 0;
 300 }
 301
 302 int s5p_sysmmu_runtime_resume(struct device *dev)
 303 {
 304         return 0;
 305 }
 306
 307 const struct dev_pm_ops s5p_sysmmu_pm_ops = {
 308         .runtime_suspend        = s5p_sysmmu_runtime_suspend,
 309         .runtime_resume         = s5p_sysmmu_runtime_resume,
 310 };
 311
 312 static struct platform_driver s5p_sysmmu_driver = {
 313         .probe          = s5p_sysmmu_probe,
 314         .remove         = s5p_sysmmu_remove,
 315         .driver         = {
 316                 .owner          = THIS_MODULE,
 317                 .name           = "s5p-sysmmu",
 318                 .pm             = &s5p_sysmmu_pm_ops,
 319         }
 320 };
 321
 322 static int __init s5p_sysmmu_init(void)
 323 {
 324         return platform_driver_register(&s5p_sysmmu_driver);
 325 }
 326 arch_initcall(s5p_sysmmu_init);