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assabet.c

/*
 * 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/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/delay.h>
#include <linux/mm.h>

#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <asm/irq.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 "generic.h"

#define ASSABET_BCR_DB1110 \
      (ASSABET_BCR_SPK_OFF    | ASSABET_BCR_QMUTE     | \
       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_QMUTE     | \
       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_backlight_power(int on)
{
#ifndef ASSABET_PAL_VIDEO
      if (on)
            ASSABET_BCR_set(ASSABET_BCR_LIGHT_ON);
      else
#endif
            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)
{
#ifndef ASSABET_PAL_VIDEO
      if (on) {
            ASSABET_BCR_set(ASSABET_BCR_LCD_ON);
            udelay(500);
      } else
#endif
            ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
}


/*
 * 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[] = {
      {
            .start      = SA1100_CS0_PHYS,
            .end  = SA1100_CS0_PHYS + SZ_32M - 1,
            .flags      = IORESOURCE_MEM,
      }, {
            .start      = SA1100_CS1_PHYS,
            .end  = SA1100_CS1_PHYS + SZ_32M - 1,
            .flags      = IORESOURCE_MEM,
      }
};


/*
 * 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 mcp_plat_data assabet_mcp_data = {
      .mccr0            = MCCR0_ADM,
      .sclk_rate  = 11981000,
};

static void __init assabet_init(void)
{
      /*
       * Ensure that the power supply is in "high power" mode.
       */
      GPDR |= GPIO_GPIO16;
      GPSR = 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
       */
      GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
      GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;

      /*
       * 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;

      sa1100fb_lcd_power = assabet_lcd_power;
      sa1100fb_backlight_power = assabet_backlight_power;

      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" );
#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(pgd_offset_k(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 machine_desc *desc, 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()) {
#ifdef CONFIG_ASSABET_NEPONSET
            extern void neponset_map_io(void);

            /*
             * We map Neponset registers even if it isn't present since
             * many drivers will try to probe their stuff (and fail).
             * This is still more friendly than a kernel paging request
             * crash.
             */
            neponset_map_io();
#endif
      } else {
            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")
      .boot_params      = 0xc0000100,
      .fixup            = fixup_assabet,
      .map_io           = assabet_map_io,
      .init_irq   = sa1100_init_irq,
      .timer            = &sa1100_timer,
      .init_machine     = assabet_init,
MACHINE_END

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