arch/arm/mach-ixp4xx/common.c

   1 /*
   2  * arch/arm/mach-ixp4xx/common.c
   3  *
   4  * Generic code shared across all IXP4XX platforms
   5  *
   6  * Maintainer: Deepak Saxena <dsaxena@plexity.net>
   7  *
   8  * Copyright 2002 (c) Intel Corporation
   9  * Copyright 2003-2004 (c) MontaVista, Software, Inc.
  10  *
  11  * This file is licensed under  the terms of the GNU General Public
  12  * License version 2. This program is licensed "as is" without any
  13  * warranty of any kind, whether express or implied.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/mm.h>
  18 #include <linux/init.h>
  19 #include <linux/serial.h>
  20 #include <linux/tty.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/serial_core.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/bitops.h>
  25 #include <linux/io.h>
  26 #include <linux/export.h>
  27 #include <linux/cpu.h>
  28 #include <linux/pci.h>
  29 #include <linux/sched_clock.h>
  30 #include <linux/soc/ixp4xx/cpu.h>
  31 #include <linux/irqchip/irq-ixp4xx.h>
  32 #include <linux/platform_data/timer-ixp4xx.h>
  33 #include <linux/dma-map-ops.h>
  34 #include <mach/udc.h>
  35 #include <mach/hardware.h>
  36 #include <linux/uaccess.h>
  37 #include <asm/page.h>
  38 #include <asm/exception.h>
  39 #include <asm/irq.h>
  40 #include <asm/system_misc.h>
  41 #include <asm/mach/map.h>
  42 #include <asm/mach/irq.h>
  43 #include <asm/mach/time.h>
  44
  45 #include "irqs.h"
  46
  47 u32 ixp4xx_read_feature_bits(void)
  48 {
  49         u32 val = ~__raw_readl(IXP4XX_EXP_CFG2);
  50
  51         if (cpu_is_ixp42x_rev_a0())
  52                 return IXP42X_FEATURE_MASK & ~(IXP4XX_FEATURE_RCOMP |
  53                                                IXP4XX_FEATURE_AES);
  54         if (cpu_is_ixp42x())
  55                 return val & IXP42X_FEATURE_MASK;
  56         if (cpu_is_ixp43x())
  57                 return val & IXP43X_FEATURE_MASK;
  58         return val & IXP46X_FEATURE_MASK;
  59 }
  60 EXPORT_SYMBOL(ixp4xx_read_feature_bits);
  61
  62 void ixp4xx_write_feature_bits(u32 value)
  63 {
  64         __raw_writel(~value, IXP4XX_EXP_CFG2);
  65 }
  66 EXPORT_SYMBOL(ixp4xx_write_feature_bits);
  67
  68 #define IXP4XX_TIMER_FREQ 66666000
  69
  70 /*************************************************************************
  71  * IXP4xx chipset I/O mapping
  72  *************************************************************************/
  73 static struct map_desc ixp4xx_io_desc[] __initdata = {
  74         {       /* UART, Interrupt ctrl, GPIO, timers, NPEs, MACs, USB .... */
  75                 .virtual        = (unsigned long)IXP4XX_PERIPHERAL_BASE_VIRT,
  76                 .pfn            = __phys_to_pfn(IXP4XX_PERIPHERAL_BASE_PHYS),
  77                 .length         = IXP4XX_PERIPHERAL_REGION_SIZE,
  78                 .type           = MT_DEVICE
  79         }, {    /* Expansion Bus Config Registers */
  80                 .virtual        = (unsigned long)IXP4XX_EXP_CFG_BASE_VIRT,
  81                 .pfn            = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
  82                 .length         = IXP4XX_EXP_CFG_REGION_SIZE,
  83                 .type           = MT_DEVICE
  84         }, {    /* PCI Registers */
  85                 .virtual        = (unsigned long)IXP4XX_PCI_CFG_BASE_VIRT,
  86                 .pfn            = __phys_to_pfn(IXP4XX_PCI_CFG_BASE_PHYS),
  87                 .length         = IXP4XX_PCI_CFG_REGION_SIZE,
  88                 .type           = MT_DEVICE
  89         },
  90 };
  91
  92 void __init ixp4xx_map_io(void)
  93 {
  94         iotable_init(ixp4xx_io_desc, ARRAY_SIZE(ixp4xx_io_desc));
  95 }
  96
  97 void __init ixp4xx_init_irq(void)
  98 {
  99         /*
 100          * ixp4xx does not implement the XScale PWRMODE register
 101          * so it must not call cpu_do_idle().
 102          */
 103         cpu_idle_poll_ctrl(true);
 104
 105         ixp4xx_irq_init(IXP4XX_INTC_BASE_PHYS,
 106                         (cpu_is_ixp46x() || cpu_is_ixp43x()));
 107 }
 108
 109 void __init ixp4xx_timer_init(void)
 110 {
 111         return ixp4xx_timer_setup(IXP4XX_TIMER_BASE_PHYS,
 112                                   IRQ_IXP4XX_TIMER1,
 113                                   IXP4XX_TIMER_FREQ);
 114 }
 115
 116 static struct pxa2xx_udc_mach_info ixp4xx_udc_info;
 117
 118 void __init ixp4xx_set_udc_info(struct pxa2xx_udc_mach_info *info)
 119 {
 120         memcpy(&ixp4xx_udc_info, info, sizeof *info);
 121 }
 122
 123 static struct resource ixp4xx_udc_resources[] = {
 124         [0] = {
 125                 .start  = 0xc800b000,
 126                 .end    = 0xc800bfff,
 127                 .flags  = IORESOURCE_MEM,
 128         },
 129         [1] = {
 130                 .start  = IRQ_IXP4XX_USB,
 131                 .end    = IRQ_IXP4XX_USB,
 132                 .flags  = IORESOURCE_IRQ,
 133         },
 134 };
 135
 136 static struct resource ixp4xx_gpio_resource[] = {
 137         {
 138                 .start = IXP4XX_GPIO_BASE_PHYS,
 139                 .end = IXP4XX_GPIO_BASE_PHYS + 0xfff,
 140                 .flags = IORESOURCE_MEM,
 141         },
 142 };
 143
 144 static struct platform_device ixp4xx_gpio_device = {
 145         .name           = "ixp4xx-gpio",
 146         .id             = -1,
 147         .dev = {
 148                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 149         },
 150         .resource = ixp4xx_gpio_resource,
 151         .num_resources  = ARRAY_SIZE(ixp4xx_gpio_resource),
 152 };
 153
 154 /*
 155  * USB device controller. The IXP4xx uses the same controller as PXA25X,
 156  * so we just use the same device.
 157  */
 158 static struct platform_device ixp4xx_udc_device = {
 159         .name           = "pxa25x-udc",
 160         .id             = -1,
 161         .num_resources  = 2,
 162         .resource       = ixp4xx_udc_resources,
 163         .dev            = {
 164                 .platform_data = &ixp4xx_udc_info,
 165         },
 166 };
 167
 168 static struct resource ixp4xx_npe_resources[] = {
 169         {
 170                 .start = IXP4XX_NPEA_BASE_PHYS,
 171                 .end = IXP4XX_NPEA_BASE_PHYS + 0xfff,
 172                 .flags = IORESOURCE_MEM,
 173         },
 174         {
 175                 .start = IXP4XX_NPEB_BASE_PHYS,
 176                 .end = IXP4XX_NPEB_BASE_PHYS + 0xfff,
 177                 .flags = IORESOURCE_MEM,
 178         },
 179         {
 180                 .start = IXP4XX_NPEC_BASE_PHYS,
 181                 .end = IXP4XX_NPEC_BASE_PHYS + 0xfff,
 182                 .flags = IORESOURCE_MEM,
 183         },
 184
 185 };
 186
 187 static struct platform_device ixp4xx_npe_device = {
 188         .name           = "ixp4xx-npe",
 189         .id             = -1,
 190         .num_resources  = ARRAY_SIZE(ixp4xx_npe_resources),
 191         .resource       = ixp4xx_npe_resources,
 192 };
 193
 194 static struct resource ixp4xx_qmgr_resources[] = {
 195         {
 196                 .start = IXP4XX_QMGR_BASE_PHYS,
 197                 .end = IXP4XX_QMGR_BASE_PHYS + 0x3fff,
 198                 .flags = IORESOURCE_MEM,
 199         },
 200         {
 201                 .start = IRQ_IXP4XX_QM1,
 202                 .end = IRQ_IXP4XX_QM1,
 203                 .flags = IORESOURCE_IRQ,
 204         },
 205         {
 206                 .start = IRQ_IXP4XX_QM2,
 207                 .end = IRQ_IXP4XX_QM2,
 208                 .flags = IORESOURCE_IRQ,
 209         },
 210 };
 211
 212 static struct platform_device ixp4xx_qmgr_device = {
 213         .name           = "ixp4xx-qmgr",
 214         .id             = -1,
 215         .num_resources  = ARRAY_SIZE(ixp4xx_qmgr_resources),
 216         .resource       = ixp4xx_qmgr_resources,
 217 };
 218
 219 static struct platform_device *ixp4xx_devices[] __initdata = {
 220         &ixp4xx_npe_device,
 221         &ixp4xx_qmgr_device,
 222         &ixp4xx_gpio_device,
 223         &ixp4xx_udc_device,
 224 };
 225
 226 static struct resource ixp46x_i2c_resources[] = {
 227         [0] = {
 228                 .start  = 0xc8011000,
 229                 .end    = 0xc801101c,
 230                 .flags  = IORESOURCE_MEM,
 231         },
 232         [1] = {
 233                 .start  = IRQ_IXP4XX_I2C,
 234                 .end    = IRQ_IXP4XX_I2C,
 235                 .flags  = IORESOURCE_IRQ
 236         }
 237 };
 238
 239 /* A single 32-bit register on IXP46x */
 240 #define IXP4XX_HWRANDOM_BASE_PHYS       0x70002100
 241
 242 static struct resource ixp46x_hwrandom_resource[] = {
 243         {
 244                 .start = IXP4XX_HWRANDOM_BASE_PHYS,
 245                 .end = IXP4XX_HWRANDOM_BASE_PHYS + 0x3,
 246                 .flags = IORESOURCE_MEM,
 247         },
 248 };
 249
 250 static struct platform_device ixp46x_hwrandom_device = {
 251         .name           = "ixp4xx-hwrandom",
 252         .id             = -1,
 253         .dev = {
 254                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 255         },
 256         .resource = ixp46x_hwrandom_resource,
 257         .num_resources  = ARRAY_SIZE(ixp46x_hwrandom_resource),
 258 };
 259
 260 /*
 261  * I2C controller. The IXP46x uses the same block as the IOP3xx, so
 262  * we just use the same device name.
 263  */
 264 static struct platform_device ixp46x_i2c_controller = {
 265         .name           = "IOP3xx-I2C",
 266         .id             = 0,
 267         .num_resources  = 2,
 268         .resource       = ixp46x_i2c_resources
 269 };
 270
 271 static struct platform_device *ixp46x_devices[] __initdata = {
 272         &ixp46x_hwrandom_device,
 273         &ixp46x_i2c_controller,
 274 };
 275
 276 unsigned long ixp4xx_exp_bus_size;
 277 EXPORT_SYMBOL(ixp4xx_exp_bus_size);
 278
 279 static struct platform_device_info ixp_dev_info __initdata = {
 280         .name           = "ixp4xx_crypto",
 281         .id             = 0,
 282         .dma_mask       = DMA_BIT_MASK(32),
 283 };
 284
 285 static int __init ixp_crypto_register(void)
 286 {
 287         struct platform_device *pdev;
 288
 289         if (!(~(*IXP4XX_EXP_CFG2) & (IXP4XX_FEATURE_HASH |
 290                                 IXP4XX_FEATURE_AES | IXP4XX_FEATURE_DES))) {
 291                 printk(KERN_ERR "ixp_crypto: No HW crypto available\n");
 292                 return -ENODEV;
 293         }
 294
 295         pdev = platform_device_register_full(&ixp_dev_info);
 296         if (IS_ERR(pdev))
 297                 return PTR_ERR(pdev);
 298
 299         return 0;
 300 }
 301
 302 void __init ixp4xx_sys_init(void)
 303 {
 304         ixp4xx_exp_bus_size = SZ_16M;
 305
 306         platform_add_devices(ixp4xx_devices, ARRAY_SIZE(ixp4xx_devices));
 307
 308         if (IS_ENABLED(CONFIG_CRYPTO_DEV_IXP4XX))
 309                 ixp_crypto_register();
 310
 311         if (cpu_is_ixp46x()) {
 312                 int region;
 313
 314                 platform_add_devices(ixp46x_devices,
 315                                 ARRAY_SIZE(ixp46x_devices));
 316
 317                 for (region = 0; region < 7; region++) {
 318                         if((*(IXP4XX_EXP_REG(0x4 * region)) & 0x200)) {
 319                                 ixp4xx_exp_bus_size = SZ_32M;
 320                                 break;
 321                         }
 322                 }
 323         }
 324
 325         printk("IXP4xx: Using %luMiB expansion bus window size\n",
 326                         ixp4xx_exp_bus_size >> 20);
 327 }
 328
 329 unsigned long ixp4xx_timer_freq = IXP4XX_TIMER_FREQ;
 330 EXPORT_SYMBOL(ixp4xx_timer_freq);
 331
 332 void ixp4xx_restart(enum reboot_mode mode, const char *cmd)
 333 {
 334         if (mode == REBOOT_SOFT) {
 335                 /* Jump into ROM at address 0 */
 336                 soft_restart(0);
 337         } else {
 338                 /* Use on-chip reset capability */
 339
 340                 /* set the "key" register to enable access to
 341                  * "timer" and "enable" registers
 342                  */
 343                 *IXP4XX_OSWK = IXP4XX_WDT_KEY;
 344
 345                 /* write 0 to the timer register for an immediate reset */
 346                 *IXP4XX_OSWT = 0;
 347
 348                 *IXP4XX_OSWE = IXP4XX_WDT_RESET_ENABLE | IXP4XX_WDT_COUNT_ENABLE;
 349         }
 350 }
 351
 352 #ifdef CONFIG_PCI
 353 static int ixp4xx_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
 354 {
 355         return (dma_addr + size) > SZ_64M;
 356 }
 357
 358 static int ixp4xx_platform_notify_remove(struct device *dev)
 359 {
 360         if (dev_is_pci(dev))
 361                 dmabounce_unregister_dev(dev);
 362
 363         return 0;
 364 }
 365 #endif
 366
 367 /*
 368  * Setup DMA mask to 64MB on PCI devices and 4 GB on all other things.
 369  */
 370 static int ixp4xx_platform_notify(struct device *dev)
 371 {
 372         dev->dma_mask = &dev->coherent_dma_mask;
 373
 374 #ifdef CONFIG_PCI
 375         if (dev_is_pci(dev)) {
 376                 dev->coherent_dma_mask = DMA_BIT_MASK(28); /* 64 MB */
 377                 dmabounce_register_dev(dev, 2048, 4096, ixp4xx_needs_bounce);
 378                 return 0;
 379         }
 380 #endif
 381
 382         dev->coherent_dma_mask = DMA_BIT_MASK(32);
 383         return 0;
 384 }
 385
 386 int dma_set_coherent_mask(struct device *dev, u64 mask)
 387 {
 388         if (dev_is_pci(dev))
 389                 mask &= DMA_BIT_MASK(28); /* 64 MB */
 390
 391         if ((mask & DMA_BIT_MASK(28)) == DMA_BIT_MASK(28)) {
 392                 dev->coherent_dma_mask = mask;
 393                 return 0;
 394         }
 395
 396         return -EIO;            /* device wanted sub-64MB mask */
 397 }
 398 EXPORT_SYMBOL(dma_set_coherent_mask);
 399
 400 #ifdef CONFIG_IXP4XX_INDIRECT_PCI
 401 /*
 402  * In the case of using indirect PCI, we simply return the actual PCI
 403  * address and our read/write implementation use that to drive the
 404  * access registers. If something outside of PCI is ioremap'd, we
 405  * fallback to the default.
 406  */
 407
 408 static void __iomem *ixp4xx_ioremap_caller(phys_addr_t addr, size_t size,
 409                                            unsigned int mtype, void *caller)
 410 {
 411         if (!is_pci_memory(addr))
 412                 return __arm_ioremap_caller(addr, size, mtype, caller);
 413
 414         return (void __iomem *)addr;
 415 }
 416
 417 static void ixp4xx_iounmap(volatile void __iomem *addr)
 418 {
 419         if (!is_pci_memory((__force u32)addr))
 420                 __iounmap(addr);
 421 }
 422 #endif
 423
 424 void __init ixp4xx_init_early(void)
 425 {
 426         platform_notify = ixp4xx_platform_notify;
 427 #ifdef CONFIG_PCI
 428         platform_notify_remove = ixp4xx_platform_notify_remove;
 429 #endif
 430 #ifdef CONFIG_IXP4XX_INDIRECT_PCI
 431         arch_ioremap_caller = ixp4xx_ioremap_caller;
 432         arch_iounmap = ixp4xx_iounmap;
 433 #endif
 434 }