text: /*
   * linux/arch/arm/mach-sa1100/assabet.c
   *
   * Author: Nicolas Pitre
   *
   * This file contains all Assabet-specific tweaks.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/errno.h>
  #include <linux/ioport.h>
  #include <linux/serial_core.h>
  #include <linux/mfd/ucb1x00.h>
  #include <linux/mtd/mtd.h>
  #include <linux/mtd/partitions.h>
  #include <linux/delay.h>
  #include <linux/mm.h>
  
  #include <video/sa1100fb.h>
  
  #include <mach/hardware.h>
  #include <asm/mach-types.h>
  #include <asm/setup.h>
  #include <asm/page.h>
  #include <asm/pgtable-hwdef.h>
  #include <asm/pgtable.h>
  #include <asm/tlbflush.h>
  
  #include <asm/mach/arch.h>
  #include <asm/mach/flash.h>
  #include <asm/mach/irda.h>
  #include <asm/mach/map.h>
  #include <asm/mach/serial_sa1100.h>
  #include <mach/assabet.h>
  #include <mach/mcp.h>
  #include <mach/irqs.h>
  
  #include "generic.h"
  
  #define ASSABET_BCR_DB1110 \
  	(ASSABET_BCR_SPK_OFF    | \
  	 ASSABET_BCR_LED_GREEN  | ASSABET_BCR_LED_RED   | \
  	 ASSABET_BCR_RS232EN    | ASSABET_BCR_LCD_12RGB | \
  	 ASSABET_BCR_IRDA_MD0)
  
  #define ASSABET_BCR_DB1111 \
  	(ASSABET_BCR_SPK_OFF    | \
  	 ASSABET_BCR_LED_GREEN  | ASSABET_BCR_LED_RED   | \
  	 ASSABET_BCR_RS232EN    | ASSABET_BCR_LCD_12RGB | \
  	 ASSABET_BCR_CF_BUS_OFF | ASSABET_BCR_STEREO_LB | \
  	 ASSABET_BCR_IRDA_MD0   | ASSABET_BCR_CF_RST)
  
  unsigned long SCR_value = ASSABET_SCR_INIT;
  EXPORT_SYMBOL(SCR_value);
  
  static unsigned long BCR_value = ASSABET_BCR_DB1110;
  
  void ASSABET_BCR_frob(unsigned int mask, unsigned int val)
  {
  	unsigned long flags;
  
  	local_irq_save(flags);
  	BCR_value = (BCR_value & ~mask) | val;
  	ASSABET_BCR = BCR_value;
  	local_irq_restore(flags);
  }
  
  EXPORT_SYMBOL(ASSABET_BCR_frob);
  
  static void assabet_ucb1x00_reset(enum ucb1x00_reset state)
  {
  	if (state == UCB_RST_PROBE)
  		ASSABET_BCR_set(ASSABET_BCR_CODEC_RST);
  }
  
  
  /*
   * Assabet flash support code.
   */
  
  #ifdef ASSABET_REV_4
  /*
   * Phase 4 Assabet has two 28F160B3 flash parts in bank 0:
   */
  static struct mtd_partition assabet_partitions[] = {
  	{
  		.name		= "bootloader",
  		.size		= 0x00020000,
  		.offset		= 0,
  		.mask_flags	= MTD_WRITEABLE,
  	}, {
  		.name		= "bootloader params",
  		.size		= 0x00020000,
  		.offset		= MTDPART_OFS_APPEND,
  		.mask_flags	= MTD_WRITEABLE,
  	}, {
  		.name		= "jffs",
  		.size		= MTDPART_SIZ_FULL,
  		.offset		= MTDPART_OFS_APPEND,
  	}
  };
  #else
  /*
   * Phase 5 Assabet has two 28F128J3A flash parts in bank 0:
   */
  static struct mtd_partition assabet_partitions[] = {
  	{
  		.name		= "bootloader",
  		.size		= 0x00040000,
  		.offset		= 0,
  		.mask_flags	= MTD_WRITEABLE,
  	}, {
  		.name		= "bootloader params",
  		.size		= 0x00040000,
  		.offset		= MTDPART_OFS_APPEND,
  		.mask_flags	= MTD_WRITEABLE,
  	}, {
  		.name		= "jffs",
  		.size		= MTDPART_SIZ_FULL,
  		.offset		= MTDPART_OFS_APPEND,
  	}
  };
  #endif
  
  static struct flash_platform_data assabet_flash_data = {
  	.map_name	= "cfi_probe",
  	.parts		= assabet_partitions,
  	.nr_parts	= ARRAY_SIZE(assabet_partitions),
  };
  
  static struct resource assabet_flash_resources[] = {
  	DEFINE_RES_MEM(SA1100_CS0_PHYS, SZ_32M),
  	DEFINE_RES_MEM(SA1100_CS1_PHYS, SZ_32M),
  };
  
  
  /*
   * Assabet IrDA support code.
   */
  
  static int assabet_irda_set_power(struct device *dev, unsigned int state)
  {
  	static unsigned int bcr_state[4] = {
  		ASSABET_BCR_IRDA_MD0,
  		ASSABET_BCR_IRDA_MD1|ASSABET_BCR_IRDA_MD0,
  		ASSABET_BCR_IRDA_MD1,
  		0
  	};
  
  	if (state < 4) {
  		state = bcr_state[state];
  		ASSABET_BCR_clear(state ^ (ASSABET_BCR_IRDA_MD1|
  					   ASSABET_BCR_IRDA_MD0));
  		ASSABET_BCR_set(state);
  	}
  	return 0;
  }
  
  static void assabet_irda_set_speed(struct device *dev, unsigned int speed)
  {
  	if (speed < 4000000)
  		ASSABET_BCR_clear(ASSABET_BCR_IRDA_FSEL);
  	else
  		ASSABET_BCR_set(ASSABET_BCR_IRDA_FSEL);
  }
  
  static struct irda_platform_data assabet_irda_data = {
  	.set_power	= assabet_irda_set_power,
  	.set_speed	= assabet_irda_set_speed,
  };
  
  static struct ucb1x00_plat_data assabet_ucb1x00_data = {
  	.reset		= assabet_ucb1x00_reset,
  	.gpio_base	= -1,
  };
  
  static struct mcp_plat_data assabet_mcp_data = {
  	.mccr0		= MCCR0_ADM,
  	.sclk_rate	= 11981000,
  	.codec_pdata	= &assabet_ucb1x00_data,
  };
  
  static void assabet_lcd_set_visual(u32 visual)
  {
  	u_int is_true_color = visual == FB_VISUAL_TRUECOLOR;
  
  	if (machine_is_assabet()) {
  #if 1		// phase 4 or newer Assabet's
  		if (is_true_color)
  			ASSABET_BCR_set(ASSABET_BCR_LCD_12RGB);
  		else
  			ASSABET_BCR_clear(ASSABET_BCR_LCD_12RGB);
  #else
  		// older Assabet's
  		if (is_true_color)
  			ASSABET_BCR_clear(ASSABET_BCR_LCD_12RGB);
  		else
  			ASSABET_BCR_set(ASSABET_BCR_LCD_12RGB);
  #endif
  	}
  }
  
  #ifndef ASSABET_PAL_VIDEO
  static void assabet_lcd_backlight_power(int on)
  {
  	if (on)
  		ASSABET_BCR_set(ASSABET_BCR_LIGHT_ON);
  	else
  		ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON);
  }
  
  /*
   * Turn on/off the backlight.  When turning the backlight on, we wait
   * 500us after turning it on so we don't cause the supplies to droop
   * when we enable the LCD controller (and cause a hard reset.)
   */
  static void assabet_lcd_power(int on)
  {
  	if (on) {
  		ASSABET_BCR_set(ASSABET_BCR_LCD_ON);
  		udelay(500);
  	} else
  		ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
  }
  
  /*
   * The assabet uses a sharp LQ039Q2DS54 LCD module.  It is actually
   * takes an RGB666 signal, but we provide it with an RGB565 signal
   * instead (def_rgb_16).
   */
  static struct sa1100fb_mach_info lq039q2ds54_info = {
  	.pixclock	= 171521,	.bpp		= 16,
  	.xres		= 320,		.yres		= 240,
  
  	.hsync_len	= 5,		.vsync_len	= 1,
  	.left_margin	= 61,		.upper_margin	= 3,
  	.right_margin	= 9,		.lower_margin	= 0,
  
  	.sync		= FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  
  	.lccr0		= LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
  	.lccr3		= LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),
  
  	.backlight_power = assabet_lcd_backlight_power,
  	.lcd_power = assabet_lcd_power,
  	.set_visual = assabet_lcd_set_visual,
  };
  #else
  static void assabet_pal_backlight_power(int on)
  {
  	ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON);
  }
  
  static void assabet_pal_power(int on)
  {
  	ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
  }
  
  static struct sa1100fb_mach_info pal_info = {
  	.pixclock	= 67797,	.bpp		= 16,
  	.xres		= 640,		.yres		= 512,
  
  	.hsync_len	= 64,		.vsync_len	= 6,
  	.left_margin	= 125,		.upper_margin	= 70,
  	.right_margin	= 115,		.lower_margin	= 36,
  
  	.lccr0		= LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
  	.lccr3		= LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(512),
  
  	.backlight_power = assabet_pal_backlight_power,
  	.lcd_power = assabet_pal_power,
  	.set_visual = assabet_lcd_set_visual,
  };
  #endif
  
  #ifdef CONFIG_ASSABET_NEPONSET
  static struct resource neponset_resources[] = {
  	DEFINE_RES_MEM(0x10000000, 0x08000000),
  	DEFINE_RES_MEM(0x18000000, 0x04000000),
  	DEFINE_RES_MEM(0x40000000, SZ_8K),
  	DEFINE_RES_IRQ(IRQ_GPIO25),
  };
  #endif
  
  static void __init assabet_init(void)
  {
  	/*
  	 * Ensure that the power supply is in "high power" mode.
  	 */
  	GPSR = GPIO_GPIO16;
  	GPDR |= GPIO_GPIO16;
  
  	/*
  	 * Ensure that these pins are set as outputs and are driving
  	 * logic 0.  This ensures that we won't inadvertently toggle
  	 * the WS latch in the CPLD, and we don't float causing
  	 * excessive power drain.  --rmk
  	 */
  	GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
  	GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
  
  	/*
  	 * Also set GPIO27 as an output; this is used to clock UART3
  	 * via the FPGA and as otherwise has no pullups or pulldowns,
  	 * so stop it floating.
  	 */
  	GPCR = GPIO_GPIO27;
  	GPDR |= GPIO_GPIO27;
  
  	/*
  	 * Set up registers for sleep mode.
  	 */
  	PWER = PWER_GPIO0;
  	PGSR = 0;
  	PCFR = 0;
  	PSDR = 0;
  	PPDR |= PPC_TXD3 | PPC_TXD1;
  	PPSR |= PPC_TXD3 | PPC_TXD1;
  
  	sa11x0_ppc_configure_mcp();
  
  	if (machine_has_neponset()) {
  		/*
  		 * Angel sets this, but other bootloaders may not.
  		 *
  		 * This must precede any driver calls to BCR_set()
  		 * or BCR_clear().
  		 */
  		ASSABET_BCR = BCR_value = ASSABET_BCR_DB1111;
  
  #ifndef CONFIG_ASSABET_NEPONSET
  		printk( "Warning: Neponset detected but full support "
  			"hasn't been configured in the kernel\n" );
  #else
  		platform_device_register_simple("neponset", 0,
  			neponset_resources, ARRAY_SIZE(neponset_resources));
  #endif
  	}
  
  #ifndef ASSABET_PAL_VIDEO
  	sa11x0_register_lcd(&lq039q2ds54_info);
  #else
  	sa11x0_register_lcd(&pal_video);
  #endif
  	sa11x0_register_mtd(&assabet_flash_data, assabet_flash_resources,
  			    ARRAY_SIZE(assabet_flash_resources));
  	sa11x0_register_irda(&assabet_irda_data);
  	sa11x0_register_mcp(&assabet_mcp_data);
  }
  
  /*
   * On Assabet, we must probe for the Neponset board _before_
   * paging_init() has occurred to actually determine the amount
   * of RAM available.  To do so, we map the appropriate IO section
   * in the page table here in order to access GPIO registers.
   */
  static void __init map_sa1100_gpio_regs( void )
  {
  	unsigned long phys = __PREG(GPLR) & PMD_MASK;
  	unsigned long virt = io_p2v(phys);
  	int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO);
  	pmd_t *pmd;
  
  	pmd = pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
  	*pmd = __pmd(phys | prot);
  	flush_pmd_entry(pmd);
  }
  
  /*
   * Read System Configuration "Register"
   * (taken from "Intel StrongARM SA-1110 Microprocessor Development Board
   * User's Guide", section 4.4.1)
   *
   * This same scan is performed in arch/arm/boot/compressed/head-sa1100.S
   * to set up the serial port for decompression status messages. We
   * repeat it here because the kernel may not be loaded as a zImage, and
   * also because it's a hassle to communicate the SCR value to the kernel
   * from the decompressor.
   *
   * Note that IRQs are guaranteed to be disabled.
   */
  static void __init get_assabet_scr(void)
  {
  	unsigned long scr, i;
  
  	GPDR |= 0x3fc;			/* Configure GPIO 9:2 as outputs */
  	GPSR = 0x3fc;			/* Write 0xFF to GPIO 9:2 */
  	GPDR &= ~(0x3fc);		/* Configure GPIO 9:2 as inputs */
  	for(i = 100; i--; )		/* Read GPIO 9:2 */
  		scr = GPLR;
  	GPDR |= 0x3fc;			/*  restore correct pin direction */
  	scr &= 0x3fc;			/* save as system configuration byte. */
  	SCR_value = scr;
  }
  
  static void __init
  fixup_assabet(struct tag *tags, char **cmdline, struct meminfo *mi)
  {
  	/* This must be done before any call to machine_has_neponset() */
  	map_sa1100_gpio_regs();
  	get_assabet_scr();
  
  	if (machine_has_neponset())
  		printk("Neponset expansion board detected\n");
  }
  
  
  static void assabet_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
  {
  	if (port->mapbase == _Ser1UTCR0) {
  		if (state)
  			ASSABET_BCR_clear(ASSABET_BCR_RS232EN |
  					  ASSABET_BCR_COM_RTS |
  					  ASSABET_BCR_COM_DTR);
  		else
  			ASSABET_BCR_set(ASSABET_BCR_RS232EN |
  					ASSABET_BCR_COM_RTS |
  					ASSABET_BCR_COM_DTR);
  	}
  }
  
  /*
   * Assabet uses COM_RTS and COM_DTR for both UART1 (com port)
   * and UART3 (radio module).  We only handle them for UART1 here.
   */
  static void assabet_set_mctrl(struct uart_port *port, u_int mctrl)
  {
  	if (port->mapbase == _Ser1UTCR0) {
  		u_int set = 0, clear = 0;
  
  		if (mctrl & TIOCM_RTS)
  			clear |= ASSABET_BCR_COM_RTS;
  		else
  			set |= ASSABET_BCR_COM_RTS;
  
  		if (mctrl & TIOCM_DTR)
  			clear |= ASSABET_BCR_COM_DTR;
  		else
  			set |= ASSABET_BCR_COM_DTR;
  
  		ASSABET_BCR_clear(clear);
  		ASSABET_BCR_set(set);
  	}
  }
  
  static u_int assabet_get_mctrl(struct uart_port *port)
  {
  	u_int ret = 0;
  	u_int bsr = ASSABET_BSR;
  
  	/* need 2 reads to read current value */
  	bsr = ASSABET_BSR;
  
  	if (port->mapbase == _Ser1UTCR0) {
  		if (bsr & ASSABET_BSR_COM_DCD)
  			ret |= TIOCM_CD;
  		if (bsr & ASSABET_BSR_COM_CTS)
  			ret |= TIOCM_CTS;
  		if (bsr & ASSABET_BSR_COM_DSR)
  			ret |= TIOCM_DSR;
  	} else if (port->mapbase == _Ser3UTCR0) {
  		if (bsr & ASSABET_BSR_RAD_DCD)
  			ret |= TIOCM_CD;
  		if (bsr & ASSABET_BSR_RAD_CTS)
  			ret |= TIOCM_CTS;
  		if (bsr & ASSABET_BSR_RAD_DSR)
  			ret |= TIOCM_DSR;
  		if (bsr & ASSABET_BSR_RAD_RI)
  			ret |= TIOCM_RI;
  	} else {
  		ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
  	}
  
  	return ret;
  }
  
  static struct sa1100_port_fns assabet_port_fns __initdata = {
  	.set_mctrl	= assabet_set_mctrl,
  	.get_mctrl	= assabet_get_mctrl,
  	.pm		= assabet_uart_pm,
  };
  
  static struct map_desc assabet_io_desc[] __initdata = {
    	{	/* Board Control Register */
  		.virtual	=  0xf1000000,
  		.pfn		= __phys_to_pfn(0x12000000),
  		.length		= 0x00100000,
  		.type		= MT_DEVICE
  	}, {	/* MQ200 */
  		.virtual	=  0xf2800000,
  		.pfn		= __phys_to_pfn(0x4b800000),
  		.length		= 0x00800000,
  		.type		= MT_DEVICE
  	}
  };
  
  static void __init assabet_map_io(void)
  {
  	sa1100_map_io();
  	iotable_init(assabet_io_desc, ARRAY_SIZE(assabet_io_desc));
  
  	/*
  	 * Set SUS bit in SDCR0 so serial port 1 functions.
  	 * Its called GPCLKR0 in my SA1110 manual.
  	 */
  	Ser1SDCR0 |= SDCR0_SUS;
  
  	if (!machine_has_neponset())
  		sa1100_register_uart_fns(&assabet_port_fns);
  
  	/*
  	 * When Neponset is attached, the first UART should be
  	 * UART3.  That's what Angel is doing and many documents
  	 * are stating this.
  	 *
  	 * We do the Neponset mapping even if Neponset support
  	 * isn't compiled in so the user will still get something on
  	 * the expected physical serial port.
  	 *
  	 * We no longer do this; not all boot loaders support it,
  	 * and UART3 appears to be somewhat unreliable with blob.
  	 */
  	sa1100_register_uart(0, 1);
  	sa1100_register_uart(2, 3);
  }
  
  
  MACHINE_START(ASSABET, "Intel-Assabet")
  	.atag_offset	= 0x100,
  	.fixup		= fixup_assabet,
  	.map_io		= assabet_map_io,
  	.nr_irqs	= SA1100_NR_IRQS,
  	.init_irq	= sa1100_init_irq,
  	.timer		= &sa1100_timer,
  	.init_machine	= assabet_init,
  	.init_late	= sa11x0_init_late,
  #ifdef CONFIG_SA1111
  	.dma_zone_size	= SZ_1M,
  #endif
  	.restart	= sa11x0_restart,
  MACHINE_END
  