arch/arm/mach-ixp4xx/goramo_mlr.c

   1 /*
   2  * Goramo MultiLink router platform code
   3  * Copyright (C) 2006-2009 Krzysztof Halasa <khc@pm.waw.pl>
   4  */
   5
   6 #include <linux/delay.h>
   7 #include <linux/gpio.h>
   8 #include <linux/hdlc.h>
   9 #include <linux/i2c-gpio.h>
  10 #include <linux/io.h>
  11 #include <linux/irq.h>
  12 #include <linux/kernel.h>
  13 #include <linux/pci.h>
  14 #include <linux/serial_8250.h>
  15 #include <asm/mach-types.h>
  16 #include <asm/mach/arch.h>
  17 #include <asm/mach/flash.h>
  18 #include <asm/mach/pci.h>
  19 #include <asm/system_info.h>
  20
  21 #define SLOT_ETHA               0x0B    /* IDSEL = AD21 */
  22 #define SLOT_ETHB               0x0C    /* IDSEL = AD20 */
  23 #define SLOT_MPCI               0x0D    /* IDSEL = AD19 */
  24 #define SLOT_NEC                0x0E    /* IDSEL = AD18 */
  25
  26 /* GPIO lines */
  27 #define GPIO_SCL                0
  28 #define GPIO_SDA                1
  29 #define GPIO_STR                2
  30 #define GPIO_IRQ_NEC            3
  31 #define GPIO_IRQ_ETHA           4
  32 #define GPIO_IRQ_ETHB           5
  33 #define GPIO_HSS0_DCD_N         6
  34 #define GPIO_HSS1_DCD_N         7
  35 #define GPIO_UART0_DCD          8
  36 #define GPIO_UART1_DCD          9
  37 #define GPIO_HSS0_CTS_N         10
  38 #define GPIO_HSS1_CTS_N         11
  39 #define GPIO_IRQ_MPCI           12
  40 #define GPIO_HSS1_RTS_N         13
  41 #define GPIO_HSS0_RTS_N         14
  42 /* GPIO15 is not connected */
  43
  44 /* Control outputs from 74HC4094 */
  45 #define CONTROL_HSS0_CLK_INT    0
  46 #define CONTROL_HSS1_CLK_INT    1
  47 #define CONTROL_HSS0_DTR_N      2
  48 #define CONTROL_HSS1_DTR_N      3
  49 #define CONTROL_EXT             4
  50 #define CONTROL_AUTO_RESET      5
  51 #define CONTROL_PCI_RESET_N     6
  52 #define CONTROL_EEPROM_WC_N     7
  53
  54 /* offsets from start of flash ROM = 0x50000000 */
  55 #define CFG_ETH0_ADDRESS        0x40 /* 6 bytes */
  56 #define CFG_ETH1_ADDRESS        0x46 /* 6 bytes */
  57 #define CFG_REV                 0x4C /* u32 */
  58 #define CFG_SDRAM_SIZE          0x50 /* u32 */
  59 #define CFG_SDRAM_CONF          0x54 /* u32 */
  60 #define CFG_SDRAM_MODE          0x58 /* u32 */
  61 #define CFG_SDRAM_REFRESH       0x5C /* u32 */
  62
  63 #define CFG_HW_BITS             0x60 /* u32 */
  64 #define  CFG_HW_USB_PORTS       0x00000007 /* 0 = no NEC chip, 1-5 = ports # */
  65 #define  CFG_HW_HAS_PCI_SLOT    0x00000008
  66 #define  CFG_HW_HAS_ETH0        0x00000010
  67 #define  CFG_HW_HAS_ETH1        0x00000020
  68 #define  CFG_HW_HAS_HSS0        0x00000040
  69 #define  CFG_HW_HAS_HSS1        0x00000080
  70 #define  CFG_HW_HAS_UART0       0x00000100
  71 #define  CFG_HW_HAS_UART1       0x00000200
  72 #define  CFG_HW_HAS_EEPROM      0x00000400
  73
  74 #define FLASH_CMD_READ_ARRAY    0xFF
  75 #define FLASH_CMD_READ_ID       0x90
  76 #define FLASH_SER_OFF           0x102 /* 0x81 in 16-bit mode */
  77
  78 static u32 hw_bits = 0xFFFFFFFD;    /* assume all hardware present */;
  79 static u8 control_value;
  80
  81 static void set_scl(u8 value)
  82 {
  83         gpio_set_value(GPIO_SCL, !!value);
  84         udelay(3);
  85 }
  86
  87 static void set_sda(u8 value)
  88 {
  89         gpio_set_value(GPIO_SDA, !!value);
  90         udelay(3);
  91 }
  92
  93 static void set_str(u8 value)
  94 {
  95         gpio_set_value(GPIO_STR, !!value);
  96         udelay(3);
  97 }
  98
  99 static inline void set_control(int line, int value)
 100 {
 101         if (value)
 102                 control_value |=  (1 << line);
 103         else
 104                 control_value &= ~(1 << line);
 105 }
 106
 107
 108 static void output_control(void)
 109 {
 110         int i;
 111
 112         gpio_direction_output(GPIO_SCL, 1);
 113         gpio_direction_output(GPIO_SDA, 1);
 114
 115         for (i = 0; i < 8; i++) {
 116                 set_scl(0);
 117                 set_sda(control_value & (0x80 >> i)); /* MSB first */
 118                 set_scl(1);     /* active edge */
 119         }
 120
 121         set_str(1);
 122         set_str(0);
 123
 124         set_scl(0);
 125         set_sda(1);             /* Be ready for START */
 126         set_scl(1);
 127 }
 128
 129
 130 static void (*set_carrier_cb_tab[2])(void *pdev, int carrier);
 131
 132 static int hss_set_clock(int port, unsigned int clock_type)
 133 {
 134         int ctrl_int = port ? CONTROL_HSS1_CLK_INT : CONTROL_HSS0_CLK_INT;
 135
 136         switch (clock_type) {
 137         case CLOCK_DEFAULT:
 138         case CLOCK_EXT:
 139                 set_control(ctrl_int, 0);
 140                 output_control();
 141                 return CLOCK_EXT;
 142
 143         case CLOCK_INT:
 144                 set_control(ctrl_int, 1);
 145                 output_control();
 146                 return CLOCK_INT;
 147
 148         default:
 149                 return -EINVAL;
 150         }
 151 }
 152
 153 static irqreturn_t hss_dcd_irq(int irq, void *pdev)
 154 {
 155         int port = (irq == IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N));
 156         int i = gpio_get_value(port ? GPIO_HSS1_DCD_N : GPIO_HSS0_DCD_N);
 157         set_carrier_cb_tab[port](pdev, !i);
 158         return IRQ_HANDLED;
 159 }
 160
 161
 162 static int hss_open(int port, void *pdev,
 163                     void (*set_carrier_cb)(void *pdev, int carrier))
 164 {
 165         int i, irq;
 166
 167         if (!port)
 168                 irq = IXP4XX_GPIO_IRQ(GPIO_HSS0_DCD_N);
 169         else
 170                 irq = IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N);
 171
 172         i = gpio_get_value(port ? GPIO_HSS1_DCD_N : GPIO_HSS0_DCD_N);
 173         set_carrier_cb(pdev, !i);
 174
 175         set_carrier_cb_tab[!!port] = set_carrier_cb;
 176
 177         if ((i = request_irq(irq, hss_dcd_irq, 0, "IXP4xx HSS", pdev)) != 0) {
 178                 printk(KERN_ERR "ixp4xx_hss: failed to request IRQ%i (%i)\n",
 179                        irq, i);
 180                 return i;
 181         }
 182
 183         set_control(port ? CONTROL_HSS1_DTR_N : CONTROL_HSS0_DTR_N, 0);
 184         output_control();
 185         gpio_set_value(port ? GPIO_HSS1_RTS_N : GPIO_HSS0_RTS_N, 0);
 186         return 0;
 187 }
 188
 189 static void hss_close(int port, void *pdev)
 190 {
 191         free_irq(port ? IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N) :
 192                  IXP4XX_GPIO_IRQ(GPIO_HSS0_DCD_N), pdev);
 193         set_carrier_cb_tab[!!port] = NULL; /* catch bugs */
 194
 195         set_control(port ? CONTROL_HSS1_DTR_N : CONTROL_HSS0_DTR_N, 1);
 196         output_control();
 197         gpio_set_value(port ? GPIO_HSS1_RTS_N : GPIO_HSS0_RTS_N, 1);
 198 }
 199
 200
 201 /* Flash memory */
 202 static struct flash_platform_data flash_data = {
 203         .map_name       = "cfi_probe",
 204         .width          = 2,
 205 };
 206
 207 static struct resource flash_resource = {
 208         .flags          = IORESOURCE_MEM,
 209 };
 210
 211 static struct platform_device device_flash = {
 212         .name           = "IXP4XX-Flash",
 213         .id             = 0,
 214         .dev            = { .platform_data = &flash_data },
 215         .num_resources  = 1,
 216         .resource       = &flash_resource,
 217 };
 218
 219
 220 /* I^2C interface */
 221 static struct i2c_gpio_platform_data i2c_data = {
 222         .sda_pin        = GPIO_SDA,
 223         .scl_pin        = GPIO_SCL,
 224 };
 225
 226 static struct platform_device device_i2c = {
 227         .name           = "i2c-gpio",
 228         .id             = 0,
 229         .dev            = { .platform_data = &i2c_data },
 230 };
 231
 232
 233 /* IXP425 2 UART ports */
 234 static struct resource uart_resources[] = {
 235         {
 236                 .start          = IXP4XX_UART1_BASE_PHYS,
 237                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 238                 .flags          = IORESOURCE_MEM,
 239         },
 240         {
 241                 .start          = IXP4XX_UART2_BASE_PHYS,
 242                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 243                 .flags          = IORESOURCE_MEM,
 244         }
 245 };
 246
 247 static struct plat_serial8250_port uart_data[] = {
 248         {
 249                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 250                 .membase        = (char __iomem *)IXP4XX_UART1_BASE_VIRT +
 251                         REG_OFFSET,
 252                 .irq            = IRQ_IXP4XX_UART1,
 253                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 254                 .iotype         = UPIO_MEM,
 255                 .regshift       = 2,
 256                 .uartclk        = IXP4XX_UART_XTAL,
 257         },
 258         {
 259                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 260                 .membase        = (char __iomem *)IXP4XX_UART2_BASE_VIRT +
 261                         REG_OFFSET,
 262                 .irq            = IRQ_IXP4XX_UART2,
 263                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 264                 .iotype         = UPIO_MEM,
 265                 .regshift       = 2,
 266                 .uartclk        = IXP4XX_UART_XTAL,
 267         },
 268         { },
 269 };
 270
 271 static struct platform_device device_uarts = {
 272         .name                   = "serial8250",
 273         .id                     = PLAT8250_DEV_PLATFORM,
 274         .dev.platform_data      = uart_data,
 275         .num_resources          = 2,
 276         .resource               = uart_resources,
 277 };
 278
 279
 280 /* Built-in 10/100 Ethernet MAC interfaces */
 281 static struct eth_plat_info eth_plat[] = {
 282         {
 283                 .phy            = 0,
 284                 .rxq            = 3,
 285                 .txreadyq       = 32,
 286         }, {
 287                 .phy            = 1,
 288                 .rxq            = 4,
 289                 .txreadyq       = 33,
 290         }
 291 };
 292
 293 static struct platform_device device_eth_tab[] = {
 294         {
 295                 .name                   = "ixp4xx_eth",
 296                 .id                     = IXP4XX_ETH_NPEB,
 297                 .dev.platform_data      = eth_plat,
 298         }, {
 299                 .name                   = "ixp4xx_eth",
 300                 .id                     = IXP4XX_ETH_NPEC,
 301                 .dev.platform_data      = eth_plat + 1,
 302         }
 303 };
 304
 305
 306 /* IXP425 2 synchronous serial ports */
 307 static struct hss_plat_info hss_plat[] = {
 308         {
 309                 .set_clock      = hss_set_clock,
 310                 .open           = hss_open,
 311                 .close          = hss_close,
 312                 .txreadyq       = 34,
 313         }, {
 314                 .set_clock      = hss_set_clock,
 315                 .open           = hss_open,
 316                 .close          = hss_close,
 317                 .txreadyq       = 35,
 318         }
 319 };
 320
 321 static struct platform_device device_hss_tab[] = {
 322         {
 323                 .name                   = "ixp4xx_hss",
 324                 .id                     = 0,
 325                 .dev.platform_data      = hss_plat,
 326         }, {
 327                 .name                   = "ixp4xx_hss",
 328                 .id                     = 1,
 329                 .dev.platform_data      = hss_plat + 1,
 330         }
 331 };
 332
 333
 334 static struct platform_device *device_tab[7] __initdata = {
 335         &device_flash,          /* index 0 */
 336 };
 337
 338 static inline u8 __init flash_readb(u8 __iomem *flash, u32 addr)
 339 {
 340 #ifdef __ARMEB__
 341         return __raw_readb(flash + addr);
 342 #else
 343         return __raw_readb(flash + (addr ^ 3));
 344 #endif
 345 }
 346
 347 static inline u16 __init flash_readw(u8 __iomem *flash, u32 addr)
 348 {
 349 #ifdef __ARMEB__
 350         return __raw_readw(flash + addr);
 351 #else
 352         return __raw_readw(flash + (addr ^ 2));
 353 #endif
 354 }
 355
 356 static void __init gmlr_init(void)
 357 {
 358         u8 __iomem *flash;
 359         int i, devices = 1; /* flash */
 360
 361         ixp4xx_sys_init();
 362
 363         if ((flash = ioremap(IXP4XX_EXP_BUS_BASE_PHYS, 0x80)) == NULL)
 364                 printk(KERN_ERR "goramo-mlr: unable to access system"
 365                        " configuration data\n");
 366         else {
 367                 system_rev = __raw_readl(flash + CFG_REV);
 368                 hw_bits = __raw_readl(flash + CFG_HW_BITS);
 369
 370                 for (i = 0; i < ETH_ALEN; i++) {
 371                         eth_plat[0].hwaddr[i] =
 372                                 flash_readb(flash, CFG_ETH0_ADDRESS + i);
 373                         eth_plat[1].hwaddr[i] =
 374                                 flash_readb(flash, CFG_ETH1_ADDRESS + i);
 375                 }
 376
 377                 __raw_writew(FLASH_CMD_READ_ID, flash);
 378                 system_serial_high = flash_readw(flash, FLASH_SER_OFF);
 379                 system_serial_high <<= 16;
 380                 system_serial_high |= flash_readw(flash, FLASH_SER_OFF + 2);
 381                 system_serial_low = flash_readw(flash, FLASH_SER_OFF + 4);
 382                 system_serial_low <<= 16;
 383                 system_serial_low |= flash_readw(flash, FLASH_SER_OFF + 6);
 384                 __raw_writew(FLASH_CMD_READ_ARRAY, flash);
 385
 386                 iounmap(flash);
 387         }
 388
 389         switch (hw_bits & (CFG_HW_HAS_UART0 | CFG_HW_HAS_UART1)) {
 390         case CFG_HW_HAS_UART0:
 391                 memset(&uart_data[1], 0, sizeof(uart_data[1]));
 392                 device_uarts.num_resources = 1;
 393                 break;
 394
 395         case CFG_HW_HAS_UART1:
 396                 device_uarts.dev.platform_data = &uart_data[1];
 397                 device_uarts.resource = &uart_resources[1];
 398                 device_uarts.num_resources = 1;
 399                 break;
 400         }
 401         if (hw_bits & (CFG_HW_HAS_UART0 | CFG_HW_HAS_UART1))
 402                 device_tab[devices++] = &device_uarts; /* max index 1 */
 403
 404         if (hw_bits & CFG_HW_HAS_ETH0)
 405                 device_tab[devices++] = &device_eth_tab[0]; /* max index 2 */
 406         if (hw_bits & CFG_HW_HAS_ETH1)
 407                 device_tab[devices++] = &device_eth_tab[1]; /* max index 3 */
 408
 409         if (hw_bits & CFG_HW_HAS_HSS0)
 410                 device_tab[devices++] = &device_hss_tab[0]; /* max index 4 */
 411         if (hw_bits & CFG_HW_HAS_HSS1)
 412                 device_tab[devices++] = &device_hss_tab[1]; /* max index 5 */
 413
 414         if (hw_bits & CFG_HW_HAS_EEPROM)
 415                 device_tab[devices++] = &device_i2c; /* max index 6 */
 416
 417         gpio_request(GPIO_SCL, "SCL/clock");
 418         gpio_request(GPIO_SDA, "SDA/data");
 419         gpio_request(GPIO_STR, "strobe");
 420         gpio_request(GPIO_HSS0_RTS_N, "HSS0 RTS");
 421         gpio_request(GPIO_HSS1_RTS_N, "HSS1 RTS");
 422         gpio_request(GPIO_HSS0_DCD_N, "HSS0 DCD");
 423         gpio_request(GPIO_HSS1_DCD_N, "HSS1 DCD");
 424
 425         gpio_direction_output(GPIO_SCL, 1);
 426         gpio_direction_output(GPIO_SDA, 1);
 427         gpio_direction_output(GPIO_STR, 0);
 428         gpio_direction_output(GPIO_HSS0_RTS_N, 1);
 429         gpio_direction_output(GPIO_HSS1_RTS_N, 1);
 430         gpio_direction_input(GPIO_HSS0_DCD_N);
 431         gpio_direction_input(GPIO_HSS1_DCD_N);
 432         irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_HSS0_DCD_N), IRQ_TYPE_EDGE_BOTH);
 433         irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N), IRQ_TYPE_EDGE_BOTH);
 434
 435         set_control(CONTROL_HSS0_DTR_N, 1);
 436         set_control(CONTROL_HSS1_DTR_N, 1);
 437         set_control(CONTROL_EEPROM_WC_N, 1);
 438         set_control(CONTROL_PCI_RESET_N, 1);
 439         output_control();
 440
 441         msleep(1);            /* Wait for PCI devices to initialize */
 442
 443         flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 444         flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 445
 446         platform_add_devices(device_tab, devices);
 447 }
 448
 449
 450 #ifdef CONFIG_PCI
 451 static void __init gmlr_pci_preinit(void)
 452 {
 453         irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHA), IRQ_TYPE_LEVEL_LOW);
 454         irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHB), IRQ_TYPE_LEVEL_LOW);
 455         irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_NEC), IRQ_TYPE_LEVEL_LOW);
 456         irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_MPCI), IRQ_TYPE_LEVEL_LOW);
 457         ixp4xx_pci_preinit();
 458 }
 459
 460 static void __init gmlr_pci_postinit(void)
 461 {
 462         if ((hw_bits & CFG_HW_USB_PORTS) >= 2 &&
 463             (hw_bits & CFG_HW_USB_PORTS) < 5) {
 464                 /* need to adjust number of USB ports on NEC chip */
 465                 u32 value, addr = BIT(32 - SLOT_NEC) | 0xE0;
 466                 if (!ixp4xx_pci_read(addr, NP_CMD_CONFIGREAD, &value)) {
 467                         value &= ~7;
 468                         value |= (hw_bits & CFG_HW_USB_PORTS);
 469                         ixp4xx_pci_write(addr, NP_CMD_CONFIGWRITE, value);
 470                 }
 471         }
 472 }
 473
 474 static int __init gmlr_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 475 {
 476         switch(slot) {
 477         case SLOT_ETHA: return IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHA);
 478         case SLOT_ETHB: return IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHB);
 479         case SLOT_NEC:  return IXP4XX_GPIO_IRQ(GPIO_IRQ_NEC);
 480         default:        return IXP4XX_GPIO_IRQ(GPIO_IRQ_MPCI);
 481         }
 482 }
 483
 484 static struct hw_pci gmlr_hw_pci __initdata = {
 485         .nr_controllers = 1,
 486         .ops            = &ixp4xx_ops,
 487         .preinit        = gmlr_pci_preinit,
 488         .postinit       = gmlr_pci_postinit,
 489         .setup          = ixp4xx_setup,
 490         .map_irq        = gmlr_map_irq,
 491 };
 492
 493 static int __init gmlr_pci_init(void)
 494 {
 495         if (machine_is_goramo_mlr() &&
 496             (hw_bits & (CFG_HW_USB_PORTS | CFG_HW_HAS_PCI_SLOT)))
 497                 pci_common_init(&gmlr_hw_pci);
 498         return 0;
 499 }
 500
 501 subsys_initcall(gmlr_pci_init);
 502 #endif /* CONFIG_PCI */
 503
 504
 505 MACHINE_START(GORAMO_MLR, "MultiLink")
 506         /* Maintainer: Krzysztof Halasa */
 507         .map_io         = ixp4xx_map_io,
 508         .init_early     = ixp4xx_init_early,
 509         .init_irq       = ixp4xx_init_irq,
 510         .init_time      = ixp4xx_timer_init,
 511         .atag_offset    = 0x100,
 512         .init_machine   = gmlr_init,
 513 #if defined(CONFIG_PCI)
 514         .dma_zone_size  = SZ_64M,
 515 #endif
 516         .restart        = ixp4xx_restart,
 517 MACHINE_END