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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * arch/arm/mach-ep93xx/core.c
0004  * Core routines for Cirrus EP93xx chips.
0005  *
0006  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
0007  * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org>
0008  *
0009  * Thanks go to Michael Burian and Ray Lehtiniemi for their key
0010  * role in the ep93xx linux community.
0011  */
0012 
0013 #define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt
0014 
0015 #include <linux/kernel.h>
0016 #include <linux/init.h>
0017 #include <linux/platform_device.h>
0018 #include <linux/interrupt.h>
0019 #include <linux/dma-mapping.h>
0020 #include <linux/sys_soc.h>
0021 #include <linux/irq.h>
0022 #include <linux/io.h>
0023 #include <linux/gpio.h>
0024 #include <linux/leds.h>
0025 #include <linux/termios.h>
0026 #include <linux/amba/bus.h>
0027 #include <linux/amba/serial.h>
0028 #include <linux/mtd/physmap.h>
0029 #include <linux/i2c.h>
0030 #include <linux/gpio/machine.h>
0031 #include <linux/spi/spi.h>
0032 #include <linux/export.h>
0033 #include <linux/irqchip/arm-vic.h>
0034 #include <linux/reboot.h>
0035 #include <linux/usb/ohci_pdriver.h>
0036 #include <linux/random.h>
0037 
0038 #include "hardware.h"
0039 #include <linux/platform_data/video-ep93xx.h>
0040 #include <linux/platform_data/keypad-ep93xx.h>
0041 #include <linux/platform_data/spi-ep93xx.h>
0042 #include <linux/soc/cirrus/ep93xx.h>
0043 
0044 #include "gpio-ep93xx.h"
0045 
0046 #include <asm/mach/arch.h>
0047 #include <asm/mach/map.h>
0048 
0049 #include "soc.h"
0050 #include "irqs.h"
0051 
0052 /*************************************************************************
0053  * Static I/O mappings that are needed for all EP93xx platforms
0054  *************************************************************************/
0055 static struct map_desc ep93xx_io_desc[] __initdata = {
0056     {
0057         .virtual    = EP93XX_AHB_VIRT_BASE,
0058         .pfn        = __phys_to_pfn(EP93XX_AHB_PHYS_BASE),
0059         .length     = EP93XX_AHB_SIZE,
0060         .type       = MT_DEVICE,
0061     }, {
0062         .virtual    = EP93XX_APB_VIRT_BASE,
0063         .pfn        = __phys_to_pfn(EP93XX_APB_PHYS_BASE),
0064         .length     = EP93XX_APB_SIZE,
0065         .type       = MT_DEVICE,
0066     },
0067 };
0068 
0069 void __init ep93xx_map_io(void)
0070 {
0071     iotable_init(ep93xx_io_desc, ARRAY_SIZE(ep93xx_io_desc));
0072 }
0073 
0074 /*************************************************************************
0075  * EP93xx IRQ handling
0076  *************************************************************************/
0077 void __init ep93xx_init_irq(void)
0078 {
0079     vic_init(EP93XX_VIC1_BASE, IRQ_EP93XX_VIC0, EP93XX_VIC1_VALID_IRQ_MASK, 0);
0080     vic_init(EP93XX_VIC2_BASE, IRQ_EP93XX_VIC1, EP93XX_VIC2_VALID_IRQ_MASK, 0);
0081 }
0082 
0083 
0084 /*************************************************************************
0085  * EP93xx System Controller Software Locked register handling
0086  *************************************************************************/
0087 
0088 /*
0089  * syscon_swlock prevents anything else from writing to the syscon
0090  * block while a software locked register is being written.
0091  */
0092 static DEFINE_SPINLOCK(syscon_swlock);
0093 
0094 void ep93xx_syscon_swlocked_write(unsigned int val, void __iomem *reg)
0095 {
0096     unsigned long flags;
0097 
0098     spin_lock_irqsave(&syscon_swlock, flags);
0099 
0100     __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
0101     __raw_writel(val, reg);
0102 
0103     spin_unlock_irqrestore(&syscon_swlock, flags);
0104 }
0105 
0106 void ep93xx_devcfg_set_clear(unsigned int set_bits, unsigned int clear_bits)
0107 {
0108     unsigned long flags;
0109     unsigned int val;
0110 
0111     spin_lock_irqsave(&syscon_swlock, flags);
0112 
0113     val = __raw_readl(EP93XX_SYSCON_DEVCFG);
0114     val &= ~clear_bits;
0115     val |= set_bits;
0116     __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
0117     __raw_writel(val, EP93XX_SYSCON_DEVCFG);
0118 
0119     spin_unlock_irqrestore(&syscon_swlock, flags);
0120 }
0121 
0122 /**
0123  * ep93xx_chip_revision() - returns the EP93xx chip revision
0124  *
0125  * See "platform.h" for more information.
0126  */
0127 unsigned int ep93xx_chip_revision(void)
0128 {
0129     unsigned int v;
0130 
0131     v = __raw_readl(EP93XX_SYSCON_SYSCFG);
0132     v &= EP93XX_SYSCON_SYSCFG_REV_MASK;
0133     v >>= EP93XX_SYSCON_SYSCFG_REV_SHIFT;
0134     return v;
0135 }
0136 EXPORT_SYMBOL_GPL(ep93xx_chip_revision);
0137 
0138 /*************************************************************************
0139  * EP93xx GPIO
0140  *************************************************************************/
0141 static struct resource ep93xx_gpio_resource[] = {
0142     DEFINE_RES_MEM(EP93XX_GPIO_PHYS_BASE, 0xcc),
0143     DEFINE_RES_IRQ(IRQ_EP93XX_GPIO_AB),
0144     DEFINE_RES_IRQ(IRQ_EP93XX_GPIO0MUX),
0145     DEFINE_RES_IRQ(IRQ_EP93XX_GPIO1MUX),
0146     DEFINE_RES_IRQ(IRQ_EP93XX_GPIO2MUX),
0147     DEFINE_RES_IRQ(IRQ_EP93XX_GPIO3MUX),
0148     DEFINE_RES_IRQ(IRQ_EP93XX_GPIO4MUX),
0149     DEFINE_RES_IRQ(IRQ_EP93XX_GPIO5MUX),
0150     DEFINE_RES_IRQ(IRQ_EP93XX_GPIO6MUX),
0151     DEFINE_RES_IRQ(IRQ_EP93XX_GPIO7MUX),
0152 };
0153 
0154 static struct platform_device ep93xx_gpio_device = {
0155     .name       = "gpio-ep93xx",
0156     .id     = -1,
0157     .num_resources  = ARRAY_SIZE(ep93xx_gpio_resource),
0158     .resource   = ep93xx_gpio_resource,
0159 };
0160 
0161 /*************************************************************************
0162  * EP93xx peripheral handling
0163  *************************************************************************/
0164 #define EP93XX_UART_MCR_OFFSET      (0x0100)
0165 
0166 static void ep93xx_uart_set_mctrl(struct amba_device *dev,
0167                   void __iomem *base, unsigned int mctrl)
0168 {
0169     unsigned int mcr;
0170 
0171     mcr = 0;
0172     if (mctrl & TIOCM_RTS)
0173         mcr |= 2;
0174     if (mctrl & TIOCM_DTR)
0175         mcr |= 1;
0176 
0177     __raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET);
0178 }
0179 
0180 static struct amba_pl010_data ep93xx_uart_data = {
0181     .set_mctrl  = ep93xx_uart_set_mctrl,
0182 };
0183 
0184 static AMBA_APB_DEVICE(uart1, "apb:uart1", 0x00041010, EP93XX_UART1_PHYS_BASE,
0185     { IRQ_EP93XX_UART1 }, &ep93xx_uart_data);
0186 
0187 static AMBA_APB_DEVICE(uart2, "apb:uart2", 0x00041010, EP93XX_UART2_PHYS_BASE,
0188     { IRQ_EP93XX_UART2 }, NULL);
0189 
0190 static AMBA_APB_DEVICE(uart3, "apb:uart3", 0x00041010, EP93XX_UART3_PHYS_BASE,
0191     { IRQ_EP93XX_UART3 }, &ep93xx_uart_data);
0192 
0193 static struct resource ep93xx_rtc_resource[] = {
0194     DEFINE_RES_MEM(EP93XX_RTC_PHYS_BASE, 0x10c),
0195 };
0196 
0197 static struct platform_device ep93xx_rtc_device = {
0198     .name       = "ep93xx-rtc",
0199     .id     = -1,
0200     .num_resources  = ARRAY_SIZE(ep93xx_rtc_resource),
0201     .resource   = ep93xx_rtc_resource,
0202 };
0203 
0204 /*************************************************************************
0205  * EP93xx OHCI USB Host
0206  *************************************************************************/
0207 
0208 static struct clk *ep93xx_ohci_host_clock;
0209 
0210 static int ep93xx_ohci_power_on(struct platform_device *pdev)
0211 {
0212     if (!ep93xx_ohci_host_clock) {
0213         ep93xx_ohci_host_clock = devm_clk_get(&pdev->dev, NULL);
0214         if (IS_ERR(ep93xx_ohci_host_clock))
0215             return PTR_ERR(ep93xx_ohci_host_clock);
0216     }
0217 
0218     return clk_prepare_enable(ep93xx_ohci_host_clock);
0219 }
0220 
0221 static void ep93xx_ohci_power_off(struct platform_device *pdev)
0222 {
0223     clk_disable(ep93xx_ohci_host_clock);
0224 }
0225 
0226 static struct usb_ohci_pdata ep93xx_ohci_pdata = {
0227     .power_on   = ep93xx_ohci_power_on,
0228     .power_off  = ep93xx_ohci_power_off,
0229     .power_suspend  = ep93xx_ohci_power_off,
0230 };
0231 
0232 static struct resource ep93xx_ohci_resources[] = {
0233     DEFINE_RES_MEM(EP93XX_USB_PHYS_BASE, 0x1000),
0234     DEFINE_RES_IRQ(IRQ_EP93XX_USB),
0235 };
0236 
0237 static u64 ep93xx_ohci_dma_mask = DMA_BIT_MASK(32);
0238 
0239 static struct platform_device ep93xx_ohci_device = {
0240     .name       = "ohci-platform",
0241     .id     = -1,
0242     .num_resources  = ARRAY_SIZE(ep93xx_ohci_resources),
0243     .resource   = ep93xx_ohci_resources,
0244     .dev        = {
0245         .dma_mask       = &ep93xx_ohci_dma_mask,
0246         .coherent_dma_mask  = DMA_BIT_MASK(32),
0247         .platform_data      = &ep93xx_ohci_pdata,
0248     },
0249 };
0250 
0251 /*************************************************************************
0252  * EP93xx physmap'ed flash
0253  *************************************************************************/
0254 static struct physmap_flash_data ep93xx_flash_data;
0255 
0256 static struct resource ep93xx_flash_resource = {
0257     .flags      = IORESOURCE_MEM,
0258 };
0259 
0260 static struct platform_device ep93xx_flash = {
0261     .name       = "physmap-flash",
0262     .id     = 0,
0263     .dev        = {
0264         .platform_data  = &ep93xx_flash_data,
0265     },
0266     .num_resources  = 1,
0267     .resource   = &ep93xx_flash_resource,
0268 };
0269 
0270 /**
0271  * ep93xx_register_flash() - Register the external flash device.
0272  * @width:  bank width in octets
0273  * @start:  resource start address
0274  * @size:   resource size
0275  */
0276 void __init ep93xx_register_flash(unsigned int width,
0277                   resource_size_t start, resource_size_t size)
0278 {
0279     ep93xx_flash_data.width     = width;
0280 
0281     ep93xx_flash_resource.start = start;
0282     ep93xx_flash_resource.end   = start + size - 1;
0283 
0284     platform_device_register(&ep93xx_flash);
0285 }
0286 
0287 
0288 /*************************************************************************
0289  * EP93xx ethernet peripheral handling
0290  *************************************************************************/
0291 static struct ep93xx_eth_data ep93xx_eth_data;
0292 
0293 static struct resource ep93xx_eth_resource[] = {
0294     DEFINE_RES_MEM(EP93XX_ETHERNET_PHYS_BASE, 0x10000),
0295     DEFINE_RES_IRQ(IRQ_EP93XX_ETHERNET),
0296 };
0297 
0298 static u64 ep93xx_eth_dma_mask = DMA_BIT_MASK(32);
0299 
0300 static struct platform_device ep93xx_eth_device = {
0301     .name       = "ep93xx-eth",
0302     .id     = -1,
0303     .dev        = {
0304         .platform_data      = &ep93xx_eth_data,
0305         .coherent_dma_mask  = DMA_BIT_MASK(32),
0306         .dma_mask       = &ep93xx_eth_dma_mask,
0307     },
0308     .num_resources  = ARRAY_SIZE(ep93xx_eth_resource),
0309     .resource   = ep93xx_eth_resource,
0310 };
0311 
0312 /**
0313  * ep93xx_register_eth - Register the built-in ethernet platform device.
0314  * @data:   platform specific ethernet configuration (__initdata)
0315  * @copy_addr:  flag indicating that the MAC address should be copied
0316  *      from the IndAd registers (as programmed by the bootloader)
0317  */
0318 void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr)
0319 {
0320     if (copy_addr)
0321         memcpy_fromio(data->dev_addr, EP93XX_ETHERNET_BASE + 0x50, 6);
0322 
0323     ep93xx_eth_data = *data;
0324     platform_device_register(&ep93xx_eth_device);
0325 }
0326 
0327 
0328 /*************************************************************************
0329  * EP93xx i2c peripheral handling
0330  *************************************************************************/
0331 
0332 /* All EP93xx devices use the same two GPIO pins for I2C bit-banging */
0333 static struct gpiod_lookup_table ep93xx_i2c_gpiod_table = {
0334     .dev_id     = "i2c-gpio.0",
0335     .table      = {
0336         /* Use local offsets on gpiochip/port "G" */
0337         GPIO_LOOKUP_IDX("G", 1, NULL, 0,
0338                 GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
0339         GPIO_LOOKUP_IDX("G", 0, NULL, 1,
0340                 GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
0341     },
0342 };
0343 
0344 static struct platform_device ep93xx_i2c_device = {
0345     .name       = "i2c-gpio",
0346     .id     = 0,
0347     .dev        = {
0348         .platform_data  = NULL,
0349     },
0350 };
0351 
0352 /**
0353  * ep93xx_register_i2c - Register the i2c platform device.
0354  * @devices:    platform specific i2c bus device information (__initdata)
0355  * @num:    the number of devices on the i2c bus
0356  */
0357 void __init ep93xx_register_i2c(struct i2c_board_info *devices, int num)
0358 {
0359     /*
0360      * FIXME: this just sets the two pins as non-opendrain, as no
0361      * platforms tries to do that anyway. Flag the applicable lines
0362      * as open drain in the GPIO_LOOKUP above and the driver or
0363      * gpiolib will handle open drain/open drain emulation as need
0364      * be. Right now i2c-gpio emulates open drain which is not
0365      * optimal.
0366      */
0367     __raw_writel((0 << 1) | (0 << 0),
0368              EP93XX_GPIO_EEDRIVE);
0369 
0370     i2c_register_board_info(0, devices, num);
0371     gpiod_add_lookup_table(&ep93xx_i2c_gpiod_table);
0372     platform_device_register(&ep93xx_i2c_device);
0373 }
0374 
0375 /*************************************************************************
0376  * EP93xx SPI peripheral handling
0377  *************************************************************************/
0378 static struct ep93xx_spi_info ep93xx_spi_master_data;
0379 
0380 static struct resource ep93xx_spi_resources[] = {
0381     DEFINE_RES_MEM(EP93XX_SPI_PHYS_BASE, 0x18),
0382     DEFINE_RES_IRQ(IRQ_EP93XX_SSP),
0383 };
0384 
0385 static u64 ep93xx_spi_dma_mask = DMA_BIT_MASK(32);
0386 
0387 static struct platform_device ep93xx_spi_device = {
0388     .name       = "ep93xx-spi",
0389     .id     = 0,
0390     .dev        = {
0391         .platform_data      = &ep93xx_spi_master_data,
0392         .coherent_dma_mask  = DMA_BIT_MASK(32),
0393         .dma_mask       = &ep93xx_spi_dma_mask,
0394     },
0395     .num_resources  = ARRAY_SIZE(ep93xx_spi_resources),
0396     .resource   = ep93xx_spi_resources,
0397 };
0398 
0399 /**
0400  * ep93xx_register_spi() - registers spi platform device
0401  * @info: ep93xx board specific spi master info (__initdata)
0402  * @devices: SPI devices to register (__initdata)
0403  * @num: number of SPI devices to register
0404  *
0405  * This function registers platform device for the EP93xx SPI controller and
0406  * also makes sure that SPI pins are muxed so that I2S is not using those pins.
0407  */
0408 void __init ep93xx_register_spi(struct ep93xx_spi_info *info,
0409                 struct spi_board_info *devices, int num)
0410 {
0411     /*
0412      * When SPI is used, we need to make sure that I2S is muxed off from
0413      * SPI pins.
0414      */
0415     ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONSSP);
0416 
0417     ep93xx_spi_master_data = *info;
0418     spi_register_board_info(devices, num);
0419     platform_device_register(&ep93xx_spi_device);
0420 }
0421 
0422 /*************************************************************************
0423  * EP93xx LEDs
0424  *************************************************************************/
0425 static const struct gpio_led ep93xx_led_pins[] __initconst = {
0426     {
0427         .name   = "platform:grled",
0428         .gpio   = EP93XX_GPIO_LINE_GRLED,
0429     }, {
0430         .name   = "platform:rdled",
0431         .gpio   = EP93XX_GPIO_LINE_RDLED,
0432     },
0433 };
0434 
0435 static const struct gpio_led_platform_data ep93xx_led_data __initconst = {
0436     .num_leds   = ARRAY_SIZE(ep93xx_led_pins),
0437     .leds       = ep93xx_led_pins,
0438 };
0439 
0440 /*************************************************************************
0441  * EP93xx pwm peripheral handling
0442  *************************************************************************/
0443 static struct resource ep93xx_pwm0_resource[] = {
0444     DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE, 0x10),
0445 };
0446 
0447 static struct platform_device ep93xx_pwm0_device = {
0448     .name       = "ep93xx-pwm",
0449     .id     = 0,
0450     .num_resources  = ARRAY_SIZE(ep93xx_pwm0_resource),
0451     .resource   = ep93xx_pwm0_resource,
0452 };
0453 
0454 static struct resource ep93xx_pwm1_resource[] = {
0455     DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE + 0x20, 0x10),
0456 };
0457 
0458 static struct platform_device ep93xx_pwm1_device = {
0459     .name       = "ep93xx-pwm",
0460     .id     = 1,
0461     .num_resources  = ARRAY_SIZE(ep93xx_pwm1_resource),
0462     .resource   = ep93xx_pwm1_resource,
0463 };
0464 
0465 void __init ep93xx_register_pwm(int pwm0, int pwm1)
0466 {
0467     if (pwm0)
0468         platform_device_register(&ep93xx_pwm0_device);
0469 
0470     /* NOTE: EP9307 does not have PWMOUT1 (pin EGPIO14) */
0471     if (pwm1)
0472         platform_device_register(&ep93xx_pwm1_device);
0473 }
0474 
0475 int ep93xx_pwm_acquire_gpio(struct platform_device *pdev)
0476 {
0477     int err;
0478 
0479     if (pdev->id == 0) {
0480         err = 0;
0481     } else if (pdev->id == 1) {
0482         err = gpio_request(EP93XX_GPIO_LINE_EGPIO14,
0483                    dev_name(&pdev->dev));
0484         if (err)
0485             return err;
0486         err = gpio_direction_output(EP93XX_GPIO_LINE_EGPIO14, 0);
0487         if (err)
0488             goto fail;
0489 
0490         /* PWM 1 output on EGPIO[14] */
0491         ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_PONG);
0492     } else {
0493         err = -ENODEV;
0494     }
0495 
0496     return err;
0497 
0498 fail:
0499     gpio_free(EP93XX_GPIO_LINE_EGPIO14);
0500     return err;
0501 }
0502 EXPORT_SYMBOL(ep93xx_pwm_acquire_gpio);
0503 
0504 void ep93xx_pwm_release_gpio(struct platform_device *pdev)
0505 {
0506     if (pdev->id == 1) {
0507         gpio_direction_input(EP93XX_GPIO_LINE_EGPIO14);
0508         gpio_free(EP93XX_GPIO_LINE_EGPIO14);
0509 
0510         /* EGPIO[14] used for GPIO */
0511         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_PONG);
0512     }
0513 }
0514 EXPORT_SYMBOL(ep93xx_pwm_release_gpio);
0515 
0516 
0517 /*************************************************************************
0518  * EP93xx video peripheral handling
0519  *************************************************************************/
0520 static struct ep93xxfb_mach_info ep93xxfb_data;
0521 
0522 static struct resource ep93xx_fb_resource[] = {
0523     DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE, 0x800),
0524 };
0525 
0526 static struct platform_device ep93xx_fb_device = {
0527     .name           = "ep93xx-fb",
0528     .id         = -1,
0529     .dev            = {
0530         .platform_data      = &ep93xxfb_data,
0531         .coherent_dma_mask  = DMA_BIT_MASK(32),
0532         .dma_mask       = &ep93xx_fb_device.dev.coherent_dma_mask,
0533     },
0534     .num_resources      = ARRAY_SIZE(ep93xx_fb_resource),
0535     .resource       = ep93xx_fb_resource,
0536 };
0537 
0538 /* The backlight use a single register in the framebuffer's register space */
0539 #define EP93XX_RASTER_REG_BRIGHTNESS 0x20
0540 
0541 static struct resource ep93xx_bl_resources[] = {
0542     DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE +
0543                EP93XX_RASTER_REG_BRIGHTNESS, 0x04),
0544 };
0545 
0546 static struct platform_device ep93xx_bl_device = {
0547     .name       = "ep93xx-bl",
0548     .id     = -1,
0549     .num_resources  = ARRAY_SIZE(ep93xx_bl_resources),
0550     .resource   = ep93xx_bl_resources,
0551 };
0552 
0553 /**
0554  * ep93xx_register_fb - Register the framebuffer platform device.
0555  * @data:   platform specific framebuffer configuration (__initdata)
0556  */
0557 void __init ep93xx_register_fb(struct ep93xxfb_mach_info *data)
0558 {
0559     ep93xxfb_data = *data;
0560     platform_device_register(&ep93xx_fb_device);
0561     platform_device_register(&ep93xx_bl_device);
0562 }
0563 
0564 
0565 /*************************************************************************
0566  * EP93xx matrix keypad peripheral handling
0567  *************************************************************************/
0568 static struct ep93xx_keypad_platform_data ep93xx_keypad_data;
0569 
0570 static struct resource ep93xx_keypad_resource[] = {
0571     DEFINE_RES_MEM(EP93XX_KEY_MATRIX_PHYS_BASE, 0x0c),
0572     DEFINE_RES_IRQ(IRQ_EP93XX_KEY),
0573 };
0574 
0575 static struct platform_device ep93xx_keypad_device = {
0576     .name       = "ep93xx-keypad",
0577     .id     = -1,
0578     .dev        = {
0579         .platform_data  = &ep93xx_keypad_data,
0580     },
0581     .num_resources  = ARRAY_SIZE(ep93xx_keypad_resource),
0582     .resource   = ep93xx_keypad_resource,
0583 };
0584 
0585 /**
0586  * ep93xx_register_keypad - Register the keypad platform device.
0587  * @data:   platform specific keypad configuration (__initdata)
0588  */
0589 void __init ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data)
0590 {
0591     ep93xx_keypad_data = *data;
0592     platform_device_register(&ep93xx_keypad_device);
0593 }
0594 
0595 int ep93xx_keypad_acquire_gpio(struct platform_device *pdev)
0596 {
0597     int err;
0598     int i;
0599 
0600     for (i = 0; i < 8; i++) {
0601         err = gpio_request(EP93XX_GPIO_LINE_C(i), dev_name(&pdev->dev));
0602         if (err)
0603             goto fail_gpio_c;
0604         err = gpio_request(EP93XX_GPIO_LINE_D(i), dev_name(&pdev->dev));
0605         if (err)
0606             goto fail_gpio_d;
0607     }
0608 
0609     /* Enable the keypad controller; GPIO ports C and D used for keypad */
0610     ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_KEYS |
0611                  EP93XX_SYSCON_DEVCFG_GONK);
0612 
0613     return 0;
0614 
0615 fail_gpio_d:
0616     gpio_free(EP93XX_GPIO_LINE_C(i));
0617 fail_gpio_c:
0618     for (--i; i >= 0; --i) {
0619         gpio_free(EP93XX_GPIO_LINE_C(i));
0620         gpio_free(EP93XX_GPIO_LINE_D(i));
0621     }
0622     return err;
0623 }
0624 EXPORT_SYMBOL(ep93xx_keypad_acquire_gpio);
0625 
0626 void ep93xx_keypad_release_gpio(struct platform_device *pdev)
0627 {
0628     int i;
0629 
0630     for (i = 0; i < 8; i++) {
0631         gpio_free(EP93XX_GPIO_LINE_C(i));
0632         gpio_free(EP93XX_GPIO_LINE_D(i));
0633     }
0634 
0635     /* Disable the keypad controller; GPIO ports C and D used for GPIO */
0636     ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
0637                    EP93XX_SYSCON_DEVCFG_GONK);
0638 }
0639 EXPORT_SYMBOL(ep93xx_keypad_release_gpio);
0640 
0641 /*************************************************************************
0642  * EP93xx I2S audio peripheral handling
0643  *************************************************************************/
0644 static struct resource ep93xx_i2s_resource[] = {
0645     DEFINE_RES_MEM(EP93XX_I2S_PHYS_BASE, 0x100),
0646     DEFINE_RES_IRQ(IRQ_EP93XX_SAI),
0647 };
0648 
0649 static struct platform_device ep93xx_i2s_device = {
0650     .name       = "ep93xx-i2s",
0651     .id     = -1,
0652     .num_resources  = ARRAY_SIZE(ep93xx_i2s_resource),
0653     .resource   = ep93xx_i2s_resource,
0654 };
0655 
0656 static struct platform_device ep93xx_pcm_device = {
0657     .name       = "ep93xx-pcm-audio",
0658     .id     = -1,
0659 };
0660 
0661 void __init ep93xx_register_i2s(void)
0662 {
0663     platform_device_register(&ep93xx_i2s_device);
0664     platform_device_register(&ep93xx_pcm_device);
0665 }
0666 
0667 #define EP93XX_SYSCON_DEVCFG_I2S_MASK   (EP93XX_SYSCON_DEVCFG_I2SONSSP | \
0668                      EP93XX_SYSCON_DEVCFG_I2SONAC97)
0669 
0670 #define EP93XX_I2SCLKDIV_MASK       (EP93XX_SYSCON_I2SCLKDIV_ORIDE | \
0671                      EP93XX_SYSCON_I2SCLKDIV_SPOL)
0672 
0673 int ep93xx_i2s_acquire(void)
0674 {
0675     unsigned val;
0676 
0677     ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_I2SONAC97,
0678             EP93XX_SYSCON_DEVCFG_I2S_MASK);
0679 
0680     /*
0681      * This is potentially racy with the clock api for i2s_mclk, sclk and 
0682      * lrclk. Since the i2s driver is the only user of those clocks we
0683      * rely on it to prevent parallel use of this function and the 
0684      * clock api for the i2s clocks.
0685      */
0686     val = __raw_readl(EP93XX_SYSCON_I2SCLKDIV);
0687     val &= ~EP93XX_I2SCLKDIV_MASK;
0688     val |= EP93XX_SYSCON_I2SCLKDIV_ORIDE | EP93XX_SYSCON_I2SCLKDIV_SPOL;
0689     ep93xx_syscon_swlocked_write(val, EP93XX_SYSCON_I2SCLKDIV);
0690 
0691     return 0;
0692 }
0693 EXPORT_SYMBOL(ep93xx_i2s_acquire);
0694 
0695 void ep93xx_i2s_release(void)
0696 {
0697     ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);
0698 }
0699 EXPORT_SYMBOL(ep93xx_i2s_release);
0700 
0701 /*************************************************************************
0702  * EP93xx AC97 audio peripheral handling
0703  *************************************************************************/
0704 static struct resource ep93xx_ac97_resources[] = {
0705     DEFINE_RES_MEM(EP93XX_AAC_PHYS_BASE, 0xac),
0706     DEFINE_RES_IRQ(IRQ_EP93XX_AACINTR),
0707 };
0708 
0709 static struct platform_device ep93xx_ac97_device = {
0710     .name       = "ep93xx-ac97",
0711     .id     = -1,
0712     .num_resources  = ARRAY_SIZE(ep93xx_ac97_resources),
0713     .resource   = ep93xx_ac97_resources,
0714 };
0715 
0716 void __init ep93xx_register_ac97(void)
0717 {
0718     /*
0719      * Make sure that the AC97 pins are not used by I2S.
0720      */
0721     ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONAC97);
0722 
0723     platform_device_register(&ep93xx_ac97_device);
0724     platform_device_register(&ep93xx_pcm_device);
0725 }
0726 
0727 /*************************************************************************
0728  * EP93xx Watchdog
0729  *************************************************************************/
0730 static struct resource ep93xx_wdt_resources[] = {
0731     DEFINE_RES_MEM(EP93XX_WATCHDOG_PHYS_BASE, 0x08),
0732 };
0733 
0734 static struct platform_device ep93xx_wdt_device = {
0735     .name       = "ep93xx-wdt",
0736     .id     = -1,
0737     .num_resources  = ARRAY_SIZE(ep93xx_wdt_resources),
0738     .resource   = ep93xx_wdt_resources,
0739 };
0740 
0741 /*************************************************************************
0742  * EP93xx IDE
0743  *************************************************************************/
0744 static struct resource ep93xx_ide_resources[] = {
0745     DEFINE_RES_MEM(EP93XX_IDE_PHYS_BASE, 0x38),
0746     DEFINE_RES_IRQ(IRQ_EP93XX_EXT3),
0747 };
0748 
0749 static struct platform_device ep93xx_ide_device = {
0750     .name       = "ep93xx-ide",
0751     .id     = -1,
0752     .dev        = {
0753         .dma_mask       = &ep93xx_ide_device.dev.coherent_dma_mask,
0754         .coherent_dma_mask  = DMA_BIT_MASK(32),
0755     },
0756     .num_resources  = ARRAY_SIZE(ep93xx_ide_resources),
0757     .resource   = ep93xx_ide_resources,
0758 };
0759 
0760 void __init ep93xx_register_ide(void)
0761 {
0762     platform_device_register(&ep93xx_ide_device);
0763 }
0764 
0765 int ep93xx_ide_acquire_gpio(struct platform_device *pdev)
0766 {
0767     int err;
0768     int i;
0769 
0770     err = gpio_request(EP93XX_GPIO_LINE_EGPIO2, dev_name(&pdev->dev));
0771     if (err)
0772         return err;
0773     err = gpio_request(EP93XX_GPIO_LINE_EGPIO15, dev_name(&pdev->dev));
0774     if (err)
0775         goto fail_egpio15;
0776     for (i = 2; i < 8; i++) {
0777         err = gpio_request(EP93XX_GPIO_LINE_E(i), dev_name(&pdev->dev));
0778         if (err)
0779             goto fail_gpio_e;
0780     }
0781     for (i = 4; i < 8; i++) {
0782         err = gpio_request(EP93XX_GPIO_LINE_G(i), dev_name(&pdev->dev));
0783         if (err)
0784             goto fail_gpio_g;
0785     }
0786     for (i = 0; i < 8; i++) {
0787         err = gpio_request(EP93XX_GPIO_LINE_H(i), dev_name(&pdev->dev));
0788         if (err)
0789             goto fail_gpio_h;
0790     }
0791 
0792     /* GPIO ports E[7:2], G[7:4] and H used by IDE */
0793     ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
0794                  EP93XX_SYSCON_DEVCFG_GONIDE |
0795                  EP93XX_SYSCON_DEVCFG_HONIDE);
0796     return 0;
0797 
0798 fail_gpio_h:
0799     for (--i; i >= 0; --i)
0800         gpio_free(EP93XX_GPIO_LINE_H(i));
0801     i = 8;
0802 fail_gpio_g:
0803     for (--i; i >= 4; --i)
0804         gpio_free(EP93XX_GPIO_LINE_G(i));
0805     i = 8;
0806 fail_gpio_e:
0807     for (--i; i >= 2; --i)
0808         gpio_free(EP93XX_GPIO_LINE_E(i));
0809     gpio_free(EP93XX_GPIO_LINE_EGPIO15);
0810 fail_egpio15:
0811     gpio_free(EP93XX_GPIO_LINE_EGPIO2);
0812     return err;
0813 }
0814 EXPORT_SYMBOL(ep93xx_ide_acquire_gpio);
0815 
0816 void ep93xx_ide_release_gpio(struct platform_device *pdev)
0817 {
0818     int i;
0819 
0820     for (i = 2; i < 8; i++)
0821         gpio_free(EP93XX_GPIO_LINE_E(i));
0822     for (i = 4; i < 8; i++)
0823         gpio_free(EP93XX_GPIO_LINE_G(i));
0824     for (i = 0; i < 8; i++)
0825         gpio_free(EP93XX_GPIO_LINE_H(i));
0826     gpio_free(EP93XX_GPIO_LINE_EGPIO15);
0827     gpio_free(EP93XX_GPIO_LINE_EGPIO2);
0828 
0829 
0830     /* GPIO ports E[7:2], G[7:4] and H used by GPIO */
0831     ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
0832                    EP93XX_SYSCON_DEVCFG_GONIDE |
0833                    EP93XX_SYSCON_DEVCFG_HONIDE);
0834 }
0835 EXPORT_SYMBOL(ep93xx_ide_release_gpio);
0836 
0837 /*************************************************************************
0838  * EP93xx ADC
0839  *************************************************************************/
0840 static struct resource ep93xx_adc_resources[] = {
0841     DEFINE_RES_MEM(EP93XX_ADC_PHYS_BASE, 0x28),
0842     DEFINE_RES_IRQ(IRQ_EP93XX_TOUCH),
0843 };
0844 
0845 static struct platform_device ep93xx_adc_device = {
0846     .name       = "ep93xx-adc",
0847     .id     = -1,
0848     .num_resources  = ARRAY_SIZE(ep93xx_adc_resources),
0849     .resource   = ep93xx_adc_resources,
0850 };
0851 
0852 void __init ep93xx_register_adc(void)
0853 {
0854     /* Power up ADC, deactivate Touch Screen Controller */
0855     ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_TIN,
0856                 EP93XX_SYSCON_DEVCFG_ADCPD);
0857 
0858     platform_device_register(&ep93xx_adc_device);
0859 }
0860 
0861 /*************************************************************************
0862  * EP93xx Security peripheral
0863  *************************************************************************/
0864 
0865 /*
0866  * The Maverick Key is 256 bits of micro fuses blown at the factory during
0867  * manufacturing to uniquely identify a part.
0868  *
0869  * See: http://arm.cirrus.com/forum/viewtopic.php?t=486&highlight=maverick+key
0870  */
0871 #define EP93XX_SECURITY_REG(x)      (EP93XX_SECURITY_BASE + (x))
0872 #define EP93XX_SECURITY_SECFLG      EP93XX_SECURITY_REG(0x2400)
0873 #define EP93XX_SECURITY_FUSEFLG     EP93XX_SECURITY_REG(0x2410)
0874 #define EP93XX_SECURITY_UNIQID      EP93XX_SECURITY_REG(0x2440)
0875 #define EP93XX_SECURITY_UNIQCHK     EP93XX_SECURITY_REG(0x2450)
0876 #define EP93XX_SECURITY_UNIQVAL     EP93XX_SECURITY_REG(0x2460)
0877 #define EP93XX_SECURITY_SECID1      EP93XX_SECURITY_REG(0x2500)
0878 #define EP93XX_SECURITY_SECID2      EP93XX_SECURITY_REG(0x2504)
0879 #define EP93XX_SECURITY_SECCHK1     EP93XX_SECURITY_REG(0x2520)
0880 #define EP93XX_SECURITY_SECCHK2     EP93XX_SECURITY_REG(0x2524)
0881 #define EP93XX_SECURITY_UNIQID2     EP93XX_SECURITY_REG(0x2700)
0882 #define EP93XX_SECURITY_UNIQID3     EP93XX_SECURITY_REG(0x2704)
0883 #define EP93XX_SECURITY_UNIQID4     EP93XX_SECURITY_REG(0x2708)
0884 #define EP93XX_SECURITY_UNIQID5     EP93XX_SECURITY_REG(0x270c)
0885 
0886 static char ep93xx_soc_id[33];
0887 
0888 static const char __init *ep93xx_get_soc_id(void)
0889 {
0890     unsigned int id, id2, id3, id4, id5;
0891 
0892     if (__raw_readl(EP93XX_SECURITY_UNIQVAL) != 1)
0893         return "bad Hamming code";
0894 
0895     id = __raw_readl(EP93XX_SECURITY_UNIQID);
0896     id2 = __raw_readl(EP93XX_SECURITY_UNIQID2);
0897     id3 = __raw_readl(EP93XX_SECURITY_UNIQID3);
0898     id4 = __raw_readl(EP93XX_SECURITY_UNIQID4);
0899     id5 = __raw_readl(EP93XX_SECURITY_UNIQID5);
0900 
0901     if (id != id2)
0902         return "invalid";
0903 
0904     /* Toss the unique ID into the entropy pool */
0905     add_device_randomness(&id2, 4);
0906     add_device_randomness(&id3, 4);
0907     add_device_randomness(&id4, 4);
0908     add_device_randomness(&id5, 4);
0909 
0910     snprintf(ep93xx_soc_id, sizeof(ep93xx_soc_id),
0911          "%08x%08x%08x%08x", id2, id3, id4, id5);
0912 
0913     return ep93xx_soc_id;
0914 }
0915 
0916 static const char __init *ep93xx_get_soc_rev(void)
0917 {
0918     int rev = ep93xx_chip_revision();
0919 
0920     switch (rev) {
0921     case EP93XX_CHIP_REV_D0:
0922         return "D0";
0923     case EP93XX_CHIP_REV_D1:
0924         return "D1";
0925     case EP93XX_CHIP_REV_E0:
0926         return "E0";
0927     case EP93XX_CHIP_REV_E1:
0928         return "E1";
0929     case EP93XX_CHIP_REV_E2:
0930         return "E2";
0931     default:
0932         return "unknown";
0933     }
0934 }
0935 
0936 static const char __init *ep93xx_get_machine_name(void)
0937 {
0938     return kasprintf(GFP_KERNEL,"%s", machine_desc->name);
0939 }
0940 
0941 static struct device __init *ep93xx_init_soc(void)
0942 {
0943     struct soc_device_attribute *soc_dev_attr;
0944     struct soc_device *soc_dev;
0945 
0946     soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
0947     if (!soc_dev_attr)
0948         return NULL;
0949 
0950     soc_dev_attr->machine = ep93xx_get_machine_name();
0951     soc_dev_attr->family = "Cirrus Logic EP93xx";
0952     soc_dev_attr->revision = ep93xx_get_soc_rev();
0953     soc_dev_attr->soc_id = ep93xx_get_soc_id();
0954 
0955     soc_dev = soc_device_register(soc_dev_attr);
0956     if (IS_ERR(soc_dev)) {
0957         kfree(soc_dev_attr->machine);
0958         kfree(soc_dev_attr);
0959         return NULL;
0960     }
0961 
0962     return soc_device_to_device(soc_dev);
0963 }
0964 
0965 struct device __init *ep93xx_init_devices(void)
0966 {
0967     struct device *parent;
0968 
0969     /* Disallow access to MaverickCrunch initially */
0970     ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_CPENA);
0971 
0972     /* Default all ports to GPIO */
0973     ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
0974                    EP93XX_SYSCON_DEVCFG_GONK |
0975                    EP93XX_SYSCON_DEVCFG_EONIDE |
0976                    EP93XX_SYSCON_DEVCFG_GONIDE |
0977                    EP93XX_SYSCON_DEVCFG_HONIDE);
0978 
0979     parent = ep93xx_init_soc();
0980 
0981     /* Get the GPIO working early, other devices need it */
0982     platform_device_register(&ep93xx_gpio_device);
0983 
0984     amba_device_register(&uart1_device, &iomem_resource);
0985     amba_device_register(&uart2_device, &iomem_resource);
0986     amba_device_register(&uart3_device, &iomem_resource);
0987 
0988     platform_device_register(&ep93xx_rtc_device);
0989     platform_device_register(&ep93xx_ohci_device);
0990     platform_device_register(&ep93xx_wdt_device);
0991 
0992     gpio_led_register_device(-1, &ep93xx_led_data);
0993 
0994     return parent;
0995 }
0996 
0997 void ep93xx_restart(enum reboot_mode mode, const char *cmd)
0998 {
0999     /*
1000      * Set then clear the SWRST bit to initiate a software reset
1001      */
1002     ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_SWRST);
1003     ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_SWRST);
1004 
1005     while (1)
1006         ;
1007 }
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