arch/arm/mach-ep93xx/core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * arch/arm/mach-ep93xx/core.c
   4  * Core routines for Cirrus EP93xx chips.
   5  *
   6  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   7  * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org>
   8  *
   9  * Thanks go to Michael Burian and Ray Lehtiniemi for their key
  10  * role in the ep93xx linux community.
  11  */
  12
  13 #define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/sys_soc.h>
  21 #include <linux/irq.h>
  22 #include <linux/io.h>
  23 #include <linux/gpio.h>
  24 #include <linux/leds.h>
  25 #include <linux/termios.h>
  26 #include <linux/amba/bus.h>
  27 #include <linux/amba/serial.h>
  28 #include <linux/mtd/physmap.h>
  29 #include <linux/i2c.h>
  30 #include <linux/gpio/machine.h>
  31 #include <linux/spi/spi.h>
  32 #include <linux/export.h>
  33 #include <linux/irqchip/arm-vic.h>
  34 #include <linux/reboot.h>
  35 #include <linux/usb/ohci_pdriver.h>
  36 #include <linux/random.h>
  37
  38 #include "hardware.h"
  39 #include <linux/platform_data/video-ep93xx.h>
  40 #include <linux/platform_data/keypad-ep93xx.h>
  41 #include <linux/platform_data/spi-ep93xx.h>
  42 #include <linux/soc/cirrus/ep93xx.h>
  43
  44 #include "gpio-ep93xx.h"
  45
  46 #include <asm/mach/arch.h>
  47 #include <asm/mach/map.h>
  48
  49 #include "soc.h"
  50
  51 /*************************************************************************
  52  * Static I/O mappings that are needed for all EP93xx platforms
  53  *************************************************************************/
  54 static struct map_desc ep93xx_io_desc[] __initdata = {
  55         {
  56                 .virtual        = EP93XX_AHB_VIRT_BASE,
  57                 .pfn            = __phys_to_pfn(EP93XX_AHB_PHYS_BASE),
  58                 .length         = EP93XX_AHB_SIZE,
  59                 .type           = MT_DEVICE,
  60         }, {
  61                 .virtual        = EP93XX_APB_VIRT_BASE,
  62                 .pfn            = __phys_to_pfn(EP93XX_APB_PHYS_BASE),
  63                 .length         = EP93XX_APB_SIZE,
  64                 .type           = MT_DEVICE,
  65         },
  66 };
  67
  68 void __init ep93xx_map_io(void)
  69 {
  70         iotable_init(ep93xx_io_desc, ARRAY_SIZE(ep93xx_io_desc));
  71 }
  72
  73 /*************************************************************************
  74  * EP93xx IRQ handling
  75  *************************************************************************/
  76 void __init ep93xx_init_irq(void)
  77 {
  78         vic_init(EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK, 0);
  79         vic_init(EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK, 0);
  80 }
  81
  82
  83 /*************************************************************************
  84  * EP93xx System Controller Software Locked register handling
  85  *************************************************************************/
  86
  87 /*
  88  * syscon_swlock prevents anything else from writing to the syscon
  89  * block while a software locked register is being written.
  90  */
  91 static DEFINE_SPINLOCK(syscon_swlock);
  92
  93 void ep93xx_syscon_swlocked_write(unsigned int val, void __iomem *reg)
  94 {
  95         unsigned long flags;
  96
  97         spin_lock_irqsave(&syscon_swlock, flags);
  98
  99         __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
 100         __raw_writel(val, reg);
 101
 102         spin_unlock_irqrestore(&syscon_swlock, flags);
 103 }
 104
 105 void ep93xx_devcfg_set_clear(unsigned int set_bits, unsigned int clear_bits)
 106 {
 107         unsigned long flags;
 108         unsigned int val;
 109
 110         spin_lock_irqsave(&syscon_swlock, flags);
 111
 112         val = __raw_readl(EP93XX_SYSCON_DEVCFG);
 113         val &= ~clear_bits;
 114         val |= set_bits;
 115         __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
 116         __raw_writel(val, EP93XX_SYSCON_DEVCFG);
 117
 118         spin_unlock_irqrestore(&syscon_swlock, flags);
 119 }
 120
 121 /**
 122  * ep93xx_chip_revision() - returns the EP93xx chip revision
 123  *
 124  * See "platform.h" for more information.
 125  */
 126 unsigned int ep93xx_chip_revision(void)
 127 {
 128         unsigned int v;
 129
 130         v = __raw_readl(EP93XX_SYSCON_SYSCFG);
 131         v &= EP93XX_SYSCON_SYSCFG_REV_MASK;
 132         v >>= EP93XX_SYSCON_SYSCFG_REV_SHIFT;
 133         return v;
 134 }
 135 EXPORT_SYMBOL_GPL(ep93xx_chip_revision);
 136
 137 /*************************************************************************
 138  * EP93xx GPIO
 139  *************************************************************************/
 140 static struct resource ep93xx_gpio_resource[] = {
 141         DEFINE_RES_MEM(EP93XX_GPIO_PHYS_BASE, 0xcc),
 142         DEFINE_RES_IRQ(IRQ_EP93XX_GPIO_AB),
 143         DEFINE_RES_IRQ(IRQ_EP93XX_GPIO0MUX),
 144         DEFINE_RES_IRQ(IRQ_EP93XX_GPIO1MUX),
 145         DEFINE_RES_IRQ(IRQ_EP93XX_GPIO2MUX),
 146         DEFINE_RES_IRQ(IRQ_EP93XX_GPIO3MUX),
 147         DEFINE_RES_IRQ(IRQ_EP93XX_GPIO4MUX),
 148         DEFINE_RES_IRQ(IRQ_EP93XX_GPIO5MUX),
 149         DEFINE_RES_IRQ(IRQ_EP93XX_GPIO6MUX),
 150         DEFINE_RES_IRQ(IRQ_EP93XX_GPIO7MUX),
 151 };
 152
 153 static struct platform_device ep93xx_gpio_device = {
 154         .name           = "gpio-ep93xx",
 155         .id             = -1,
 156         .num_resources  = ARRAY_SIZE(ep93xx_gpio_resource),
 157         .resource       = ep93xx_gpio_resource,
 158 };
 159
 160 /*************************************************************************
 161  * EP93xx peripheral handling
 162  *************************************************************************/
 163 #define EP93XX_UART_MCR_OFFSET          (0x0100)
 164
 165 static void ep93xx_uart_set_mctrl(struct amba_device *dev,
 166                                   void __iomem *base, unsigned int mctrl)
 167 {
 168         unsigned int mcr;
 169
 170         mcr = 0;
 171         if (mctrl & TIOCM_RTS)
 172                 mcr |= 2;
 173         if (mctrl & TIOCM_DTR)
 174                 mcr |= 1;
 175
 176         __raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET);
 177 }
 178
 179 static struct amba_pl010_data ep93xx_uart_data = {
 180         .set_mctrl      = ep93xx_uart_set_mctrl,
 181 };
 182
 183 static AMBA_APB_DEVICE(uart1, "apb:uart1", 0x00041010, EP93XX_UART1_PHYS_BASE,
 184         { IRQ_EP93XX_UART1 }, &ep93xx_uart_data);
 185
 186 static AMBA_APB_DEVICE(uart2, "apb:uart2", 0x00041010, EP93XX_UART2_PHYS_BASE,
 187         { IRQ_EP93XX_UART2 }, NULL);
 188
 189 static AMBA_APB_DEVICE(uart3, "apb:uart3", 0x00041010, EP93XX_UART3_PHYS_BASE,
 190         { IRQ_EP93XX_UART3 }, &ep93xx_uart_data);
 191
 192 static struct resource ep93xx_rtc_resource[] = {
 193         DEFINE_RES_MEM(EP93XX_RTC_PHYS_BASE, 0x10c),
 194 };
 195
 196 static struct platform_device ep93xx_rtc_device = {
 197         .name           = "ep93xx-rtc",
 198         .id             = -1,
 199         .num_resources  = ARRAY_SIZE(ep93xx_rtc_resource),
 200         .resource       = ep93xx_rtc_resource,
 201 };
 202
 203 /*************************************************************************
 204  * EP93xx OHCI USB Host
 205  *************************************************************************/
 206
 207 static struct clk *ep93xx_ohci_host_clock;
 208
 209 static int ep93xx_ohci_power_on(struct platform_device *pdev)
 210 {
 211         if (!ep93xx_ohci_host_clock) {
 212                 ep93xx_ohci_host_clock = devm_clk_get(&pdev->dev, NULL);
 213                 if (IS_ERR(ep93xx_ohci_host_clock))
 214                         return PTR_ERR(ep93xx_ohci_host_clock);
 215         }
 216
 217         return clk_enable(ep93xx_ohci_host_clock);
 218 }
 219
 220 static void ep93xx_ohci_power_off(struct platform_device *pdev)
 221 {
 222         clk_disable(ep93xx_ohci_host_clock);
 223 }
 224
 225 static struct usb_ohci_pdata ep93xx_ohci_pdata = {
 226         .power_on       = ep93xx_ohci_power_on,
 227         .power_off      = ep93xx_ohci_power_off,
 228         .power_suspend  = ep93xx_ohci_power_off,
 229 };
 230
 231 static struct resource ep93xx_ohci_resources[] = {
 232         DEFINE_RES_MEM(EP93XX_USB_PHYS_BASE, 0x1000),
 233         DEFINE_RES_IRQ(IRQ_EP93XX_USB),
 234 };
 235
 236 static u64 ep93xx_ohci_dma_mask = DMA_BIT_MASK(32);
 237
 238 static struct platform_device ep93xx_ohci_device = {
 239         .name           = "ohci-platform",
 240         .id             = -1,
 241         .num_resources  = ARRAY_SIZE(ep93xx_ohci_resources),
 242         .resource       = ep93xx_ohci_resources,
 243         .dev            = {
 244                 .dma_mask               = &ep93xx_ohci_dma_mask,
 245                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 246                 .platform_data          = &ep93xx_ohci_pdata,
 247         },
 248 };
 249
 250 /*************************************************************************
 251  * EP93xx physmap'ed flash
 252  *************************************************************************/
 253 static struct physmap_flash_data ep93xx_flash_data;
 254
 255 static struct resource ep93xx_flash_resource = {
 256         .flags          = IORESOURCE_MEM,
 257 };
 258
 259 static struct platform_device ep93xx_flash = {
 260         .name           = "physmap-flash",
 261         .id             = 0,
 262         .dev            = {
 263                 .platform_data  = &ep93xx_flash_data,
 264         },
 265         .num_resources  = 1,
 266         .resource       = &ep93xx_flash_resource,
 267 };
 268
 269 /**
 270  * ep93xx_register_flash() - Register the external flash device.
 271  * @width:      bank width in octets
 272  * @start:      resource start address
 273  * @size:       resource size
 274  */
 275 void __init ep93xx_register_flash(unsigned int width,
 276                                   resource_size_t start, resource_size_t size)
 277 {
 278         ep93xx_flash_data.width         = width;
 279
 280         ep93xx_flash_resource.start     = start;
 281         ep93xx_flash_resource.end       = start + size - 1;
 282
 283         platform_device_register(&ep93xx_flash);
 284 }
 285
 286
 287 /*************************************************************************
 288  * EP93xx ethernet peripheral handling
 289  *************************************************************************/
 290 static struct ep93xx_eth_data ep93xx_eth_data;
 291
 292 static struct resource ep93xx_eth_resource[] = {
 293         DEFINE_RES_MEM(EP93XX_ETHERNET_PHYS_BASE, 0x10000),
 294         DEFINE_RES_IRQ(IRQ_EP93XX_ETHERNET),
 295 };
 296
 297 static u64 ep93xx_eth_dma_mask = DMA_BIT_MASK(32);
 298
 299 static struct platform_device ep93xx_eth_device = {
 300         .name           = "ep93xx-eth",
 301         .id             = -1,
 302         .dev            = {
 303                 .platform_data          = &ep93xx_eth_data,
 304                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 305                 .dma_mask               = &ep93xx_eth_dma_mask,
 306         },
 307         .num_resources  = ARRAY_SIZE(ep93xx_eth_resource),
 308         .resource       = ep93xx_eth_resource,
 309 };
 310
 311 /**
 312  * ep93xx_register_eth - Register the built-in ethernet platform device.
 313  * @data:       platform specific ethernet configuration (__initdata)
 314  * @copy_addr:  flag indicating that the MAC address should be copied
 315  *              from the IndAd registers (as programmed by the bootloader)
 316  */
 317 void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr)
 318 {
 319         if (copy_addr)
 320                 memcpy_fromio(data->dev_addr, EP93XX_ETHERNET_BASE + 0x50, 6);
 321
 322         ep93xx_eth_data = *data;
 323         platform_device_register(&ep93xx_eth_device);
 324 }
 325
 326
 327 /*************************************************************************
 328  * EP93xx i2c peripheral handling
 329  *************************************************************************/
 330
 331 /* All EP93xx devices use the same two GPIO pins for I2C bit-banging */
 332 static struct gpiod_lookup_table ep93xx_i2c_gpiod_table = {
 333         .dev_id         = "i2c-gpio.0",
 334         .table          = {
 335                 /* Use local offsets on gpiochip/port "G" */
 336                 GPIO_LOOKUP_IDX("G", 1, NULL, 0,
 337                                 GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
 338                 GPIO_LOOKUP_IDX("G", 0, NULL, 1,
 339                                 GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
 340         },
 341 };
 342
 343 static struct platform_device ep93xx_i2c_device = {
 344         .name           = "i2c-gpio",
 345         .id             = 0,
 346         .dev            = {
 347                 .platform_data  = NULL,
 348         },
 349 };
 350
 351 /**
 352  * ep93xx_register_i2c - Register the i2c platform device.
 353  * @devices:    platform specific i2c bus device information (__initdata)
 354  * @num:        the number of devices on the i2c bus
 355  */
 356 void __init ep93xx_register_i2c(struct i2c_board_info *devices, int num)
 357 {
 358         /*
 359          * FIXME: this just sets the two pins as non-opendrain, as no
 360          * platforms tries to do that anyway. Flag the applicable lines
 361          * as open drain in the GPIO_LOOKUP above and the driver or
 362          * gpiolib will handle open drain/open drain emulation as need
 363          * be. Right now i2c-gpio emulates open drain which is not
 364          * optimal.
 365          */
 366         __raw_writel((0 << 1) | (0 << 0),
 367                      EP93XX_GPIO_EEDRIVE);
 368
 369         i2c_register_board_info(0, devices, num);
 370         gpiod_add_lookup_table(&ep93xx_i2c_gpiod_table);
 371         platform_device_register(&ep93xx_i2c_device);
 372 }
 373
 374 /*************************************************************************
 375  * EP93xx SPI peripheral handling
 376  *************************************************************************/
 377 static struct ep93xx_spi_info ep93xx_spi_master_data;
 378
 379 static struct resource ep93xx_spi_resources[] = {
 380         DEFINE_RES_MEM(EP93XX_SPI_PHYS_BASE, 0x18),
 381         DEFINE_RES_IRQ(IRQ_EP93XX_SSP),
 382 };
 383
 384 static u64 ep93xx_spi_dma_mask = DMA_BIT_MASK(32);
 385
 386 static struct platform_device ep93xx_spi_device = {
 387         .name           = "ep93xx-spi",
 388         .id             = 0,
 389         .dev            = {
 390                 .platform_data          = &ep93xx_spi_master_data,
 391                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 392                 .dma_mask               = &ep93xx_spi_dma_mask,
 393         },
 394         .num_resources  = ARRAY_SIZE(ep93xx_spi_resources),
 395         .resource       = ep93xx_spi_resources,
 396 };
 397
 398 /**
 399  * ep93xx_register_spi() - registers spi platform device
 400  * @info: ep93xx board specific spi master info (__initdata)
 401  * @devices: SPI devices to register (__initdata)
 402  * @num: number of SPI devices to register
 403  *
 404  * This function registers platform device for the EP93xx SPI controller and
 405  * also makes sure that SPI pins are muxed so that I2S is not using those pins.
 406  */
 407 void __init ep93xx_register_spi(struct ep93xx_spi_info *info,
 408                                 struct spi_board_info *devices, int num)
 409 {
 410         /*
 411          * When SPI is used, we need to make sure that I2S is muxed off from
 412          * SPI pins.
 413          */
 414         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONSSP);
 415
 416         ep93xx_spi_master_data = *info;
 417         spi_register_board_info(devices, num);
 418         platform_device_register(&ep93xx_spi_device);
 419 }
 420
 421 /*************************************************************************
 422  * EP93xx LEDs
 423  *************************************************************************/
 424 static const struct gpio_led ep93xx_led_pins[] __initconst = {
 425         {
 426                 .name   = "platform:grled",
 427                 .gpio   = EP93XX_GPIO_LINE_GRLED,
 428         }, {
 429                 .name   = "platform:rdled",
 430                 .gpio   = EP93XX_GPIO_LINE_RDLED,
 431         },
 432 };
 433
 434 static const struct gpio_led_platform_data ep93xx_led_data __initconst = {
 435         .num_leds       = ARRAY_SIZE(ep93xx_led_pins),
 436         .leds           = ep93xx_led_pins,
 437 };
 438
 439 /*************************************************************************
 440  * EP93xx pwm peripheral handling
 441  *************************************************************************/
 442 static struct resource ep93xx_pwm0_resource[] = {
 443         DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE, 0x10),
 444 };
 445
 446 static struct platform_device ep93xx_pwm0_device = {
 447         .name           = "ep93xx-pwm",
 448         .id             = 0,
 449         .num_resources  = ARRAY_SIZE(ep93xx_pwm0_resource),
 450         .resource       = ep93xx_pwm0_resource,
 451 };
 452
 453 static struct resource ep93xx_pwm1_resource[] = {
 454         DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE + 0x20, 0x10),
 455 };
 456
 457 static struct platform_device ep93xx_pwm1_device = {
 458         .name           = "ep93xx-pwm",
 459         .id             = 1,
 460         .num_resources  = ARRAY_SIZE(ep93xx_pwm1_resource),
 461         .resource       = ep93xx_pwm1_resource,
 462 };
 463
 464 void __init ep93xx_register_pwm(int pwm0, int pwm1)
 465 {
 466         if (pwm0)
 467                 platform_device_register(&ep93xx_pwm0_device);
 468
 469         /* NOTE: EP9307 does not have PWMOUT1 (pin EGPIO14) */
 470         if (pwm1)
 471                 platform_device_register(&ep93xx_pwm1_device);
 472 }
 473
 474 int ep93xx_pwm_acquire_gpio(struct platform_device *pdev)
 475 {
 476         int err;
 477
 478         if (pdev->id == 0) {
 479                 err = 0;
 480         } else if (pdev->id == 1) {
 481                 err = gpio_request(EP93XX_GPIO_LINE_EGPIO14,
 482                                    dev_name(&pdev->dev));
 483                 if (err)
 484                         return err;
 485                 err = gpio_direction_output(EP93XX_GPIO_LINE_EGPIO14, 0);
 486                 if (err)
 487                         goto fail;
 488
 489                 /* PWM 1 output on EGPIO[14] */
 490                 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_PONG);
 491         } else {
 492                 err = -ENODEV;
 493         }
 494
 495         return err;
 496
 497 fail:
 498         gpio_free(EP93XX_GPIO_LINE_EGPIO14);
 499         return err;
 500 }
 501 EXPORT_SYMBOL(ep93xx_pwm_acquire_gpio);
 502
 503 void ep93xx_pwm_release_gpio(struct platform_device *pdev)
 504 {
 505         if (pdev->id == 1) {
 506                 gpio_direction_input(EP93XX_GPIO_LINE_EGPIO14);
 507                 gpio_free(EP93XX_GPIO_LINE_EGPIO14);
 508
 509                 /* EGPIO[14] used for GPIO */
 510                 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_PONG);
 511         }
 512 }
 513 EXPORT_SYMBOL(ep93xx_pwm_release_gpio);
 514
 515
 516 /*************************************************************************
 517  * EP93xx video peripheral handling
 518  *************************************************************************/
 519 static struct ep93xxfb_mach_info ep93xxfb_data;
 520
 521 static struct resource ep93xx_fb_resource[] = {
 522         DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE, 0x800),
 523 };
 524
 525 static struct platform_device ep93xx_fb_device = {
 526         .name                   = "ep93xx-fb",
 527         .id                     = -1,
 528         .dev                    = {
 529                 .platform_data          = &ep93xxfb_data,
 530                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 531                 .dma_mask               = &ep93xx_fb_device.dev.coherent_dma_mask,
 532         },
 533         .num_resources          = ARRAY_SIZE(ep93xx_fb_resource),
 534         .resource               = ep93xx_fb_resource,
 535 };
 536
 537 /* The backlight use a single register in the framebuffer's register space */
 538 #define EP93XX_RASTER_REG_BRIGHTNESS 0x20
 539
 540 static struct resource ep93xx_bl_resources[] = {
 541         DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE +
 542                        EP93XX_RASTER_REG_BRIGHTNESS, 0x04),
 543 };
 544
 545 static struct platform_device ep93xx_bl_device = {
 546         .name           = "ep93xx-bl",
 547         .id             = -1,
 548         .num_resources  = ARRAY_SIZE(ep93xx_bl_resources),
 549         .resource       = ep93xx_bl_resources,
 550 };
 551
 552 /**
 553  * ep93xx_register_fb - Register the framebuffer platform device.
 554  * @data:       platform specific framebuffer configuration (__initdata)
 555  */
 556 void __init ep93xx_register_fb(struct ep93xxfb_mach_info *data)
 557 {
 558         ep93xxfb_data = *data;
 559         platform_device_register(&ep93xx_fb_device);
 560         platform_device_register(&ep93xx_bl_device);
 561 }
 562
 563
 564 /*************************************************************************
 565  * EP93xx matrix keypad peripheral handling
 566  *************************************************************************/
 567 static struct ep93xx_keypad_platform_data ep93xx_keypad_data;
 568
 569 static struct resource ep93xx_keypad_resource[] = {
 570         DEFINE_RES_MEM(EP93XX_KEY_MATRIX_PHYS_BASE, 0x0c),
 571         DEFINE_RES_IRQ(IRQ_EP93XX_KEY),
 572 };
 573
 574 static struct platform_device ep93xx_keypad_device = {
 575         .name           = "ep93xx-keypad",
 576         .id             = -1,
 577         .dev            = {
 578                 .platform_data  = &ep93xx_keypad_data,
 579         },
 580         .num_resources  = ARRAY_SIZE(ep93xx_keypad_resource),
 581         .resource       = ep93xx_keypad_resource,
 582 };
 583
 584 /**
 585  * ep93xx_register_keypad - Register the keypad platform device.
 586  * @data:       platform specific keypad configuration (__initdata)
 587  */
 588 void __init ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data)
 589 {
 590         ep93xx_keypad_data = *data;
 591         platform_device_register(&ep93xx_keypad_device);
 592 }
 593
 594 int ep93xx_keypad_acquire_gpio(struct platform_device *pdev)
 595 {
 596         int err;
 597         int i;
 598
 599         for (i = 0; i < 8; i++) {
 600                 err = gpio_request(EP93XX_GPIO_LINE_C(i), dev_name(&pdev->dev));
 601                 if (err)
 602                         goto fail_gpio_c;
 603                 err = gpio_request(EP93XX_GPIO_LINE_D(i), dev_name(&pdev->dev));
 604                 if (err)
 605                         goto fail_gpio_d;
 606         }
 607
 608         /* Enable the keypad controller; GPIO ports C and D used for keypad */
 609         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_KEYS |
 610                                  EP93XX_SYSCON_DEVCFG_GONK);
 611
 612         return 0;
 613
 614 fail_gpio_d:
 615         gpio_free(EP93XX_GPIO_LINE_C(i));
 616 fail_gpio_c:
 617         for (--i; i >= 0; --i) {
 618                 gpio_free(EP93XX_GPIO_LINE_C(i));
 619                 gpio_free(EP93XX_GPIO_LINE_D(i));
 620         }
 621         return err;
 622 }
 623 EXPORT_SYMBOL(ep93xx_keypad_acquire_gpio);
 624
 625 void ep93xx_keypad_release_gpio(struct platform_device *pdev)
 626 {
 627         int i;
 628
 629         for (i = 0; i < 8; i++) {
 630                 gpio_free(EP93XX_GPIO_LINE_C(i));
 631                 gpio_free(EP93XX_GPIO_LINE_D(i));
 632         }
 633
 634         /* Disable the keypad controller; GPIO ports C and D used for GPIO */
 635         ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
 636                                EP93XX_SYSCON_DEVCFG_GONK);
 637 }
 638 EXPORT_SYMBOL(ep93xx_keypad_release_gpio);
 639
 640 /*************************************************************************
 641  * EP93xx I2S audio peripheral handling
 642  *************************************************************************/
 643 static struct resource ep93xx_i2s_resource[] = {
 644         DEFINE_RES_MEM(EP93XX_I2S_PHYS_BASE, 0x100),
 645         DEFINE_RES_IRQ(IRQ_EP93XX_SAI),
 646 };
 647
 648 static struct platform_device ep93xx_i2s_device = {
 649         .name           = "ep93xx-i2s",
 650         .id             = -1,
 651         .num_resources  = ARRAY_SIZE(ep93xx_i2s_resource),
 652         .resource       = ep93xx_i2s_resource,
 653 };
 654
 655 static struct platform_device ep93xx_pcm_device = {
 656         .name           = "ep93xx-pcm-audio",
 657         .id             = -1,
 658 };
 659
 660 void __init ep93xx_register_i2s(void)
 661 {
 662         platform_device_register(&ep93xx_i2s_device);
 663         platform_device_register(&ep93xx_pcm_device);
 664 }
 665
 666 #define EP93XX_SYSCON_DEVCFG_I2S_MASK   (EP93XX_SYSCON_DEVCFG_I2SONSSP | \
 667                                          EP93XX_SYSCON_DEVCFG_I2SONAC97)
 668
 669 #define EP93XX_I2SCLKDIV_MASK           (EP93XX_SYSCON_I2SCLKDIV_ORIDE | \
 670                                          EP93XX_SYSCON_I2SCLKDIV_SPOL)
 671
 672 int ep93xx_i2s_acquire(void)
 673 {
 674         unsigned val;
 675
 676         ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_I2SONAC97,
 677                         EP93XX_SYSCON_DEVCFG_I2S_MASK);
 678
 679         /*
 680          * This is potentially racy with the clock api for i2s_mclk, sclk and
 681          * lrclk. Since the i2s driver is the only user of those clocks we
 682          * rely on it to prevent parallel use of this function and the
 683          * clock api for the i2s clocks.
 684          */
 685         val = __raw_readl(EP93XX_SYSCON_I2SCLKDIV);
 686         val &= ~EP93XX_I2SCLKDIV_MASK;
 687         val |= EP93XX_SYSCON_I2SCLKDIV_ORIDE | EP93XX_SYSCON_I2SCLKDIV_SPOL;
 688         ep93xx_syscon_swlocked_write(val, EP93XX_SYSCON_I2SCLKDIV);
 689
 690         return 0;
 691 }
 692 EXPORT_SYMBOL(ep93xx_i2s_acquire);
 693
 694 void ep93xx_i2s_release(void)
 695 {
 696         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);
 697 }
 698 EXPORT_SYMBOL(ep93xx_i2s_release);
 699
 700 /*************************************************************************
 701  * EP93xx AC97 audio peripheral handling
 702  *************************************************************************/
 703 static struct resource ep93xx_ac97_resources[] = {
 704         DEFINE_RES_MEM(EP93XX_AAC_PHYS_BASE, 0xac),
 705         DEFINE_RES_IRQ(IRQ_EP93XX_AACINTR),
 706 };
 707
 708 static struct platform_device ep93xx_ac97_device = {
 709         .name           = "ep93xx-ac97",
 710         .id             = -1,
 711         .num_resources  = ARRAY_SIZE(ep93xx_ac97_resources),
 712         .resource       = ep93xx_ac97_resources,
 713 };
 714
 715 void __init ep93xx_register_ac97(void)
 716 {
 717         /*
 718          * Make sure that the AC97 pins are not used by I2S.
 719          */
 720         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONAC97);
 721
 722         platform_device_register(&ep93xx_ac97_device);
 723         platform_device_register(&ep93xx_pcm_device);
 724 }
 725
 726 /*************************************************************************
 727  * EP93xx Watchdog
 728  *************************************************************************/
 729 static struct resource ep93xx_wdt_resources[] = {
 730         DEFINE_RES_MEM(EP93XX_WATCHDOG_PHYS_BASE, 0x08),
 731 };
 732
 733 static struct platform_device ep93xx_wdt_device = {
 734         .name           = "ep93xx-wdt",
 735         .id             = -1,
 736         .num_resources  = ARRAY_SIZE(ep93xx_wdt_resources),
 737         .resource       = ep93xx_wdt_resources,
 738 };
 739
 740 /*************************************************************************
 741  * EP93xx IDE
 742  *************************************************************************/
 743 static struct resource ep93xx_ide_resources[] = {
 744         DEFINE_RES_MEM(EP93XX_IDE_PHYS_BASE, 0x38),
 745         DEFINE_RES_IRQ(IRQ_EP93XX_EXT3),
 746 };
 747
 748 static struct platform_device ep93xx_ide_device = {
 749         .name           = "ep93xx-ide",
 750         .id             = -1,
 751         .dev            = {
 752                 .dma_mask               = &ep93xx_ide_device.dev.coherent_dma_mask,
 753                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 754         },
 755         .num_resources  = ARRAY_SIZE(ep93xx_ide_resources),
 756         .resource       = ep93xx_ide_resources,
 757 };
 758
 759 void __init ep93xx_register_ide(void)
 760 {
 761         platform_device_register(&ep93xx_ide_device);
 762 }
 763
 764 int ep93xx_ide_acquire_gpio(struct platform_device *pdev)
 765 {
 766         int err;
 767         int i;
 768
 769         err = gpio_request(EP93XX_GPIO_LINE_EGPIO2, dev_name(&pdev->dev));
 770         if (err)
 771                 return err;
 772         err = gpio_request(EP93XX_GPIO_LINE_EGPIO15, dev_name(&pdev->dev));
 773         if (err)
 774                 goto fail_egpio15;
 775         for (i = 2; i < 8; i++) {
 776                 err = gpio_request(EP93XX_GPIO_LINE_E(i), dev_name(&pdev->dev));
 777                 if (err)
 778                         goto fail_gpio_e;
 779         }
 780         for (i = 4; i < 8; i++) {
 781                 err = gpio_request(EP93XX_GPIO_LINE_G(i), dev_name(&pdev->dev));
 782                 if (err)
 783                         goto fail_gpio_g;
 784         }
 785         for (i = 0; i < 8; i++) {
 786                 err = gpio_request(EP93XX_GPIO_LINE_H(i), dev_name(&pdev->dev));
 787                 if (err)
 788                         goto fail_gpio_h;
 789         }
 790
 791         /* GPIO ports E[7:2], G[7:4] and H used by IDE */
 792         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
 793                                  EP93XX_SYSCON_DEVCFG_GONIDE |
 794                                  EP93XX_SYSCON_DEVCFG_HONIDE);
 795         return 0;
 796
 797 fail_gpio_h:
 798         for (--i; i >= 0; --i)
 799                 gpio_free(EP93XX_GPIO_LINE_H(i));
 800         i = 8;
 801 fail_gpio_g:
 802         for (--i; i >= 4; --i)
 803                 gpio_free(EP93XX_GPIO_LINE_G(i));
 804         i = 8;
 805 fail_gpio_e:
 806         for (--i; i >= 2; --i)
 807                 gpio_free(EP93XX_GPIO_LINE_E(i));
 808         gpio_free(EP93XX_GPIO_LINE_EGPIO15);
 809 fail_egpio15:
 810         gpio_free(EP93XX_GPIO_LINE_EGPIO2);
 811         return err;
 812 }
 813 EXPORT_SYMBOL(ep93xx_ide_acquire_gpio);
 814
 815 void ep93xx_ide_release_gpio(struct platform_device *pdev)
 816 {
 817         int i;
 818
 819         for (i = 2; i < 8; i++)
 820                 gpio_free(EP93XX_GPIO_LINE_E(i));
 821         for (i = 4; i < 8; i++)
 822                 gpio_free(EP93XX_GPIO_LINE_G(i));
 823         for (i = 0; i < 8; i++)
 824                 gpio_free(EP93XX_GPIO_LINE_H(i));
 825         gpio_free(EP93XX_GPIO_LINE_EGPIO15);
 826         gpio_free(EP93XX_GPIO_LINE_EGPIO2);
 827
 828
 829         /* GPIO ports E[7:2], G[7:4] and H used by GPIO */
 830         ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
 831                                EP93XX_SYSCON_DEVCFG_GONIDE |
 832                                EP93XX_SYSCON_DEVCFG_HONIDE);
 833 }
 834 EXPORT_SYMBOL(ep93xx_ide_release_gpio);
 835
 836 /*************************************************************************
 837  * EP93xx ADC
 838  *************************************************************************/
 839 static struct resource ep93xx_adc_resources[] = {
 840         DEFINE_RES_MEM(EP93XX_ADC_PHYS_BASE, 0x28),
 841         DEFINE_RES_IRQ(IRQ_EP93XX_TOUCH),
 842 };
 843
 844 static struct platform_device ep93xx_adc_device = {
 845         .name           = "ep93xx-adc",
 846         .id             = -1,
 847         .num_resources  = ARRAY_SIZE(ep93xx_adc_resources),
 848         .resource       = ep93xx_adc_resources,
 849 };
 850
 851 void __init ep93xx_register_adc(void)
 852 {
 853         /* Power up ADC, deactivate Touch Screen Controller */
 854         ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_TIN,
 855                                 EP93XX_SYSCON_DEVCFG_ADCPD);
 856
 857         platform_device_register(&ep93xx_adc_device);
 858 }
 859
 860 /*************************************************************************
 861  * EP93xx Security peripheral
 862  *************************************************************************/
 863
 864 /*
 865  * The Maverick Key is 256 bits of micro fuses blown at the factory during
 866  * manufacturing to uniquely identify a part.
 867  *
 868  * See: http://arm.cirrus.com/forum/viewtopic.php?t=486&highlight=maverick+key
 869  */
 870 #define EP93XX_SECURITY_REG(x)          (EP93XX_SECURITY_BASE + (x))
 871 #define EP93XX_SECURITY_SECFLG          EP93XX_SECURITY_REG(0x2400)
 872 #define EP93XX_SECURITY_FUSEFLG         EP93XX_SECURITY_REG(0x2410)
 873 #define EP93XX_SECURITY_UNIQID          EP93XX_SECURITY_REG(0x2440)
 874 #define EP93XX_SECURITY_UNIQCHK         EP93XX_SECURITY_REG(0x2450)
 875 #define EP93XX_SECURITY_UNIQVAL         EP93XX_SECURITY_REG(0x2460)
 876 #define EP93XX_SECURITY_SECID1          EP93XX_SECURITY_REG(0x2500)
 877 #define EP93XX_SECURITY_SECID2          EP93XX_SECURITY_REG(0x2504)
 878 #define EP93XX_SECURITY_SECCHK1         EP93XX_SECURITY_REG(0x2520)
 879 #define EP93XX_SECURITY_SECCHK2         EP93XX_SECURITY_REG(0x2524)
 880 #define EP93XX_SECURITY_UNIQID2         EP93XX_SECURITY_REG(0x2700)
 881 #define EP93XX_SECURITY_UNIQID3         EP93XX_SECURITY_REG(0x2704)
 882 #define EP93XX_SECURITY_UNIQID4         EP93XX_SECURITY_REG(0x2708)
 883 #define EP93XX_SECURITY_UNIQID5         EP93XX_SECURITY_REG(0x270c)
 884
 885 static char ep93xx_soc_id[33];
 886
 887 static const char __init *ep93xx_get_soc_id(void)
 888 {
 889         unsigned int id, id2, id3, id4, id5;
 890
 891         if (__raw_readl(EP93XX_SECURITY_UNIQVAL) != 1)
 892                 return "bad Hamming code";
 893
 894         id = __raw_readl(EP93XX_SECURITY_UNIQID);
 895         id2 = __raw_readl(EP93XX_SECURITY_UNIQID2);
 896         id3 = __raw_readl(EP93XX_SECURITY_UNIQID3);
 897         id4 = __raw_readl(EP93XX_SECURITY_UNIQID4);
 898         id5 = __raw_readl(EP93XX_SECURITY_UNIQID5);
 899
 900         if (id != id2)
 901                 return "invalid";
 902
 903         /* Toss the unique ID into the entropy pool */
 904         add_device_randomness(&id2, 4);
 905         add_device_randomness(&id3, 4);
 906         add_device_randomness(&id4, 4);
 907         add_device_randomness(&id5, 4);
 908
 909         snprintf(ep93xx_soc_id, sizeof(ep93xx_soc_id),
 910                  "%08x%08x%08x%08x", id2, id3, id4, id5);
 911
 912         return ep93xx_soc_id;
 913 }
 914
 915 static const char __init *ep93xx_get_soc_rev(void)
 916 {
 917         int rev = ep93xx_chip_revision();
 918
 919         switch (rev) {
 920         case EP93XX_CHIP_REV_D0:
 921                 return "D0";
 922         case EP93XX_CHIP_REV_D1:
 923                 return "D1";
 924         case EP93XX_CHIP_REV_E0:
 925                 return "E0";
 926         case EP93XX_CHIP_REV_E1:
 927                 return "E1";
 928         case EP93XX_CHIP_REV_E2:
 929                 return "E2";
 930         default:
 931                 return "unknown";
 932         }
 933 }
 934
 935 static const char __init *ep93xx_get_machine_name(void)
 936 {
 937         return kasprintf(GFP_KERNEL,"%s", machine_desc->name);
 938 }
 939
 940 static struct device __init *ep93xx_init_soc(void)
 941 {
 942         struct soc_device_attribute *soc_dev_attr;
 943         struct soc_device *soc_dev;
 944
 945         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 946         if (!soc_dev_attr)
 947                 return NULL;
 948
 949         soc_dev_attr->machine = ep93xx_get_machine_name();
 950         soc_dev_attr->family = "Cirrus Logic EP93xx";
 951         soc_dev_attr->revision = ep93xx_get_soc_rev();
 952         soc_dev_attr->soc_id = ep93xx_get_soc_id();
 953
 954         soc_dev = soc_device_register(soc_dev_attr);
 955         if (IS_ERR(soc_dev)) {
 956                 kfree(soc_dev_attr->machine);
 957                 kfree(soc_dev_attr);
 958                 return NULL;
 959         }
 960
 961         return soc_device_to_device(soc_dev);
 962 }
 963
 964 struct device __init *ep93xx_init_devices(void)
 965 {
 966         struct device *parent;
 967
 968         /* Disallow access to MaverickCrunch initially */
 969         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_CPENA);
 970
 971         /* Default all ports to GPIO */
 972         ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
 973                                EP93XX_SYSCON_DEVCFG_GONK |
 974                                EP93XX_SYSCON_DEVCFG_EONIDE |
 975                                EP93XX_SYSCON_DEVCFG_GONIDE |
 976                                EP93XX_SYSCON_DEVCFG_HONIDE);
 977
 978         parent = ep93xx_init_soc();
 979
 980         /* Get the GPIO working early, other devices need it */
 981         platform_device_register(&ep93xx_gpio_device);
 982
 983         amba_device_register(&uart1_device, &iomem_resource);
 984         amba_device_register(&uart2_device, &iomem_resource);
 985         amba_device_register(&uart3_device, &iomem_resource);
 986
 987         platform_device_register(&ep93xx_rtc_device);
 988         platform_device_register(&ep93xx_ohci_device);
 989         platform_device_register(&ep93xx_wdt_device);
 990
 991         gpio_led_register_device(-1, &ep93xx_led_data);
 992
 993         return parent;
 994 }
 995
 996 void ep93xx_restart(enum reboot_mode mode, const char *cmd)
 997 {
 998         /*
 999          * Set then clear the SWRST bit to initiate a software reset
1000          */
1001         ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_SWRST);
1002         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_SWRST);
1003
1004         while (1)
1005                 ;
1006 }