text: /* linux/arch/arm/mach-s3c2410/s3c2440.c
   *
   * Copyright (c) 2004-2005 Simtec Electronics
   *   Ben Dooks <ben@simtec.co.uk>
   *
   * Samsung S3C2440 Mobile CPU support
   *
   * 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.
   *
   * Modifications:
   *	24-Aug-2004 BJD  Start of s3c2440 support
   *	12-Oct-2004 BJD	 Moved clock info out to clock.c
   *	01-Nov-2004 BJD  Fixed clock build code
   *	09-Nov-2004 BJD  Added sysdev for power management
   *	04-Nov-2004 BJD  New serial registration
   *	15-Nov-2004 BJD  Rename the i2c device for the s3c2440
   *	14-Jan-2005 BJD  Moved clock init code into seperate function
   *	14-Jan-2005 BJD  Removed un-used clock bits
  */
  
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/interrupt.h>
  #include <linux/list.h>
  #include <linux/timer.h>
  #include <linux/init.h>
  #include <linux/platform_device.h>
  #include <linux/sysdev.h>
  #include <linux/clk.h>
  
  #include <asm/mach/arch.h>
  #include <asm/mach/map.h>
  #include <asm/mach/irq.h>
  
  #include <asm/hardware.h>
  #include <asm/io.h>
  #include <asm/irq.h>
  
  #include <asm/arch/regs-clock.h>
  #include <asm/arch/regs-serial.h>
  #include <asm/arch/regs-gpio.h>
  #include <asm/arch/regs-gpioj.h>
  #include <asm/arch/regs-dsc.h>
  
  #include "s3c2440.h"
  #include "clock.h"
  #include "devs.h"
  #include "cpu.h"
  #include "pm.h"
  
  
  static struct map_desc s3c2440_iodesc[] __initdata = {
  	IODESC_ENT(USBHOST),
  	IODESC_ENT(CLKPWR),
  	IODESC_ENT(LCD),
  	IODESC_ENT(TIMER),
  	IODESC_ENT(ADC),
  	IODESC_ENT(WATCHDOG),
  };
  
  static struct resource s3c_uart0_resource[] = {
  	[0] = {
  		.start = S3C2410_PA_UART0,
  		.end   = S3C2410_PA_UART0 + 0x3fff,
  		.flags = IORESOURCE_MEM,
  	},
  	[1] = {
  		.start = IRQ_S3CUART_RX0,
  		.end   = IRQ_S3CUART_ERR0,
  		.flags = IORESOURCE_IRQ,
  	}
  
  };
  
  static struct resource s3c_uart1_resource[] = {
  	[0] = {
  		.start = S3C2410_PA_UART1,
  		.end   = S3C2410_PA_UART1 + 0x3fff,
  		.flags = IORESOURCE_MEM,
  	},
  	[1] = {
  		.start = IRQ_S3CUART_RX1,
  		.end   = IRQ_S3CUART_ERR1,
  		.flags = IORESOURCE_IRQ,
  	}
  };
  
  static struct resource s3c_uart2_resource[] = {
  	[0] = {
  		.start = S3C2410_PA_UART2,
  		.end   = S3C2410_PA_UART2 + 0x3fff,
  		.flags = IORESOURCE_MEM,
  	},
  	[1] = {
  		.start = IRQ_S3CUART_RX2,
  		.end   = IRQ_S3CUART_ERR2,
  		.flags = IORESOURCE_IRQ,
  	}
  };
  
  /* our uart devices */
  
  static struct platform_device s3c_uart0 = {
  	.name		  = "s3c2440-uart",
  	.id		  = 0,
  	.num_resources	  = ARRAY_SIZE(s3c_uart0_resource),
  	.resource	  = s3c_uart0_resource,
  };
  
  static struct platform_device s3c_uart1 = {
  	.name		  = "s3c2440-uart",
  	.id		  = 1,
  	.num_resources	  = ARRAY_SIZE(s3c_uart1_resource),
  	.resource	  = s3c_uart1_resource,
  };
  
  static struct platform_device s3c_uart2 = {
  	.name		  = "s3c2440-uart",
  	.id		  = 2,
  	.num_resources	  = ARRAY_SIZE(s3c_uart2_resource),
  	.resource	  = s3c_uart2_resource,
  };
  
  static struct platform_device *uart_devices[] __initdata = {
  	&s3c_uart0,
  	&s3c_uart1,
  	&s3c_uart2
  };
  
  /* uart initialisation */
  
  static int __initdata s3c2440_uart_count;
  
  void __init s3c2440_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  {
  	struct platform_device *platdev;
  	int uart;
  
  	for (uart = 0; uart < no; uart++, cfg++) {
  		platdev = uart_devices[cfg->hwport];
  
  		s3c24xx_uart_devs[uart] = platdev;
  		platdev->dev.platform_data = cfg;
  	}
  
  	s3c2440_uart_count = uart;
  }
  
  
  #ifdef CONFIG_PM
  
  static struct sleep_save s3c2440_sleep[] = {
  	SAVE_ITEM(S3C2440_DSC0),
  	SAVE_ITEM(S3C2440_DSC1),
  	SAVE_ITEM(S3C2440_GPJDAT),
  	SAVE_ITEM(S3C2440_GPJCON),
  	SAVE_ITEM(S3C2440_GPJUP)
  };
  
  static int s3c2440_suspend(struct sys_device *dev, pm_message_t state)
  {
  	s3c2410_pm_do_save(s3c2440_sleep, ARRAY_SIZE(s3c2440_sleep));
  	return 0;
  }
  
  static int s3c2440_resume(struct sys_device *dev)
  {
  	s3c2410_pm_do_restore(s3c2440_sleep, ARRAY_SIZE(s3c2440_sleep));
  	return 0;
  }
  
  #else
  #define s3c2440_suspend NULL
  #define s3c2440_resume  NULL
  #endif
  
  struct sysdev_class s3c2440_sysclass = {
  	set_kset_name("s3c2440-core"),
  	.suspend	= s3c2440_suspend,
  	.resume		= s3c2440_resume
  };
  
  static struct sys_device s3c2440_sysdev = {
  	.cls		= &s3c2440_sysclass,
  };
  
  void __init s3c2440_map_io(struct map_desc *mach_desc, int size)
  {
  	/* register our io-tables */
  
  	iotable_init(s3c2440_iodesc, ARRAY_SIZE(s3c2440_iodesc));
  	iotable_init(mach_desc, size);
  
  	/* rename any peripherals used differing from the s3c2410 */
  
  	s3c_device_i2c.name  = "s3c2440-i2c";
  	s3c_device_nand.name = "s3c2440-nand";
  
  	/* change irq for watchdog */
  
  	s3c_device_wdt.resource[1].start = IRQ_S3C2440_WDT;
  	s3c_device_wdt.resource[1].end   = IRQ_S3C2440_WDT;
  }
  
  void __init s3c2440_init_clocks(int xtal)
  {
  	unsigned long clkdiv;
  	unsigned long camdiv;
  	unsigned long hclk, fclk, pclk;
  	int hdiv = 1;
  
  	/* now we've got our machine bits initialised, work out what
  	 * clocks we've got */
  
  	fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;
  
  	clkdiv = __raw_readl(S3C2410_CLKDIVN);
  	camdiv = __raw_readl(S3C2440_CAMDIVN);
  
  	/* work out clock scalings */
  
  	switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
  	case S3C2440_CLKDIVN_HDIVN_1:
  		hdiv = 1;
  		break;
  
  	case S3C2440_CLKDIVN_HDIVN_2:
  		hdiv = 2;
  		break;
  
  	case S3C2440_CLKDIVN_HDIVN_4_8:
  		hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
  		break;
  
  	case S3C2440_CLKDIVN_HDIVN_3_6:
  		hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
  		break;
  	}
  
  	hclk = fclk / hdiv;
  	pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN)? 2:1);
  
  	/* print brief summary of clocks, etc */
  
  	printk("S3C2440: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
  	       print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
  
  	/* initialise the clocks here, to allow other things like the
  	 * console to use them, and to add new ones after the initialisation
  	 */
  
  	s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
  }
  
  /* need to register class before we actually register the device, and
   * we also need to ensure that it has been initialised before any of the
   * drivers even try to use it (even if not on an s3c2440 based system)
   * as a driver which may support both 2410 and 2440 may try and use it.
  */
  
  static int __init s3c2440_core_init(void)
  {
  	return sysdev_class_register(&s3c2440_sysclass);
  }
  
  core_initcall(s3c2440_core_init);
  
  int __init s3c2440_init(void)
  {
  	int ret;
  
  	printk("S3C2440: Initialising architecture\n");
  
  	ret = sysdev_register(&s3c2440_sysdev);
  	if (ret != 0)
  		printk(KERN_ERR "failed to register sysdev for s3c2440\n");
  	else
  		ret = platform_add_devices(s3c24xx_uart_devs, s3c2440_uart_count);
  
  	return ret;
  }
  