Logo Search packages:      
Sourcecode: linux version File versions  Download package

flash.c

/*
 * Hammerhead board-specific flash initialization
 *
 * Copyright (C) 2008 Miromico AG
 *
 * 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/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>
#include <linux/usb/isp116x.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>

#include <mach/portmux.h>
#include <mach/at32ap700x.h>
#include <mach/smc.h>

#include "../../mach-at32ap/clock.h"
#include "flash.h"


#define HAMMERHEAD_USB_PERIPH_GCLK0 0x40000000
#define HAMMERHEAD_USB_PERIPH_CS2   0x02000000
#define HAMMERHEAD_USB_PERIPH_EXTINT0     0x02000000

#define HAMMERHEAD_FPGA_PERIPH_MOSI 0x00000002
#define HAMMERHEAD_FPGA_PERIPH_SCK  0x00000020
#define HAMMERHEAD_FPGA_PERIPH_EXTINT3    0x10000000

static struct smc_timing flash_timing __initdata = {
      .ncs_read_setup         = 0,
      .nrd_setup        = 40,
      .ncs_write_setup  = 0,
      .nwe_setup        = 10,

      .ncs_read_pulse         = 80,
      .nrd_pulse        = 40,
      .ncs_write_pulse  = 65,
      .nwe_pulse        = 55,

      .read_cycle       = 120,
      .write_cycle            = 120,
};

static struct smc_config flash_config __initdata = {
      .bus_width        = 2,
      .nrd_controlled         = 1,
      .nwe_controlled         = 1,
      .byte_write       = 1,
};

static struct mtd_partition flash_parts[] = {
      {
            .name       = "u-boot",
            .offset           = 0x00000000,
            .size       = 0x00020000,           /* 128 KiB */
            .mask_flags = MTD_WRITEABLE,
      },
      {
            .name       = "root",
            .offset           = 0x00020000,
            .size       = 0x007d0000,
      },
      {
            .name       = "env",
            .offset           = 0x007f0000,
            .size       = 0x00010000,
            .mask_flags = MTD_WRITEABLE,
      },
};

static struct physmap_flash_data flash_data = {
      .width            = 2,
      .nr_parts   = ARRAY_SIZE(flash_parts),
      .parts            = flash_parts,
};

static struct resource flash_resource = {
      .start            = 0x00000000,
      .end        = 0x007fffff,
      .flags            = IORESOURCE_MEM,
};

static struct platform_device flash_device = {
      .name       = "physmap-flash",
      .id         = 0,
      .resource   = &flash_resource,
      .num_resources    = 1,
      .dev        = { .platform_data = &flash_data, },
};

#ifdef CONFIG_BOARD_HAMMERHEAD_USB

static struct smc_timing isp1160_timing __initdata = {
      .ncs_read_setup         = 75,
      .nrd_setup        = 75,
      .ncs_write_setup  = 75,
      .nwe_setup        = 75,


      /* We use conservative timing settings, as the minimal settings aren't
         stable. There may be room for tweaking. */
      .ncs_read_pulse         = 75,  /* min. 33ns */
      .nrd_pulse        = 75,  /* min. 33ns */
      .ncs_write_pulse  = 75,  /* min. 26ns */
      .nwe_pulse        = 75,  /* min. 26ns */

      .read_cycle       = 225, /* min. 143ns */
      .write_cycle            = 225, /* min. 136ns */
};

static struct smc_config isp1160_config __initdata = {
      .bus_width        = 2,
      .nrd_controlled         = 1,
      .nwe_controlled         = 1,
      .byte_write       = 0,
};

/*
 * The platform delay function is only used to enforce the strange
 * read to write delay. This can not be configured in the SMC. All other
 * timings are controlled by the SMC (see timings obove)
 * So in isp116x-hcd.c we should comment out USE_PLATFORM_DELAY
 */
void isp116x_delay(struct device *dev, int delay)
{
      if (delay > 150)
            ndelay(delay - 150);
}

static struct  isp116x_platform_data isp1160_data = {
      .sel15Kres        = 1,  /* use internal downstream resistors */
      .oc_enable        = 0,  /* external overcurrent detection */
      .int_edge_triggered     = 0,  /* interrupt is level triggered */
      .int_act_high           = 0,  /* interrupt is active low */
      .delay = isp116x_delay,       /* platform delay function */
};

static struct resource isp1160_resource[] = {
      {
            .start            = 0x08000000,
            .end        = 0x08000001,
            .flags            = IORESOURCE_MEM,
      },
      {
            .start            = 0x08000002,
            .end        = 0x08000003,
            .flags            = IORESOURCE_MEM,
      },
      {
            .start            = 64,
            .flags            = IORESOURCE_IRQ,
      },
};

static struct platform_device isp1160_device = {
      .name       = "isp116x-hcd",
      .id         = 0,
      .resource   = isp1160_resource,
      .num_resources    = 3,
      .dev        = {
            .platform_data = &isp1160_data,
      },
};
#endif

#ifdef CONFIG_BOARD_HAMMERHEAD_USB
static int __init hammerhead_usbh_init(void)
{
      struct clk *gclk;
      struct clk *osc;

      int ret;

      /* setup smc for usbh */
      smc_set_timing(&isp1160_config, &isp1160_timing);
      ret = smc_set_configuration(2, &isp1160_config);

      if (ret < 0) {
            printk(KERN_ERR
                   "hammerhead: failed to set ISP1160 USBH timing\n");
            return ret;
      }

      /* setup gclk0 to run from osc1 */
      gclk = clk_get(NULL, "gclk0");
      if (IS_ERR(gclk))
            goto err_gclk;

      osc = clk_get(NULL, "osc1");
      if (IS_ERR(osc))
            goto err_osc;

      if (clk_set_parent(gclk, osc)) {
            pr_debug("hammerhead: failed to set osc1 for USBH clock\n");
            goto err_set_clk;
      }

      /* set clock to 6MHz */
      clk_set_rate(gclk, 6000000);

      /* and enable */
      clk_enable(gclk);

      /* select GCLK0 peripheral function */
      at32_select_periph(GPIO_PIOA_BASE, HAMMERHEAD_USB_PERIPH_GCLK0,
                     GPIO_PERIPH_A, 0);

      /* enable CS2 peripheral function */
      at32_select_periph(GPIO_PIOE_BASE, HAMMERHEAD_USB_PERIPH_CS2,
                     GPIO_PERIPH_A, 0);

      /* H_WAKEUP must be driven low */
      at32_select_gpio(GPIO_PIN_PA(8), AT32_GPIOF_OUTPUT);

      /* Select EXTINT0 for PB25 */
      at32_select_periph(GPIO_PIOB_BASE, HAMMERHEAD_USB_PERIPH_EXTINT0,
                     GPIO_PERIPH_A, 0);

      /* register usbh device driver */
      platform_device_register(&isp1160_device);

 err_set_clk:
      clk_put(osc);
 err_osc:
      clk_put(gclk);
 err_gclk:
      return ret;
}
#endif

#ifdef CONFIG_BOARD_HAMMERHEAD_FPGA
static struct smc_timing fpga_timing __initdata = {
      .ncs_read_setup         = 16,
      .nrd_setup        = 32,
      .ncs_read_pulse         = 48,
      .nrd_pulse        = 32,
      .read_cycle       = 64,

      .ncs_write_setup  = 16,
      .nwe_setup        = 16,
      .ncs_write_pulse  = 32,
      .nwe_pulse        = 32,
      .write_cycle            = 64,
};

static struct smc_config fpga_config __initdata = {
      .bus_width        = 4,
      .nrd_controlled         = 1,
      .nwe_controlled         = 1,
      .byte_write       = 0,
};

static struct resource hh_fpga0_resource[] = {
      {
            .start            = 0xffe00400,
            .end        = 0xffe00400 + 0x3ff,
            .flags            = IORESOURCE_MEM,
      },
      {
            .start            = 4,
            .end        = 4,
            .flags            = IORESOURCE_IRQ,
      },
      {
            .start            = 0x0c000000,
            .end        = 0x0c000100,
            .flags            = IORESOURCE_MEM,
      },
      {
            .start            = 67,
            .end        = 67,
            .flags            = IORESOURCE_IRQ,
      },
};

static u64 hh_fpga0_dma_mask = DMA_BIT_MASK(32);
static struct platform_device hh_fpga0_device = {
      .name       = "hh_fpga",
      .id         = 0,
      .dev        = {
            .dma_mask = &hh_fpga0_dma_mask,
            .coherent_dma_mask = DMA_BIT_MASK(32),
      },
      .resource   = hh_fpga0_resource,
      .num_resources    = ARRAY_SIZE(hh_fpga0_resource),
};

static struct clk hh_fpga0_spi_clk = {
      .name       = "spi_clk",
      .dev        = &hh_fpga0_device.dev,
      .mode       = pba_clk_mode,
      .get_rate   = pba_clk_get_rate,
      .index            = 1,
};

struct platform_device *__init at32_add_device_hh_fpga(void)
{
      /* Select peripheral functionallity for SPI SCK and MOSI */
      at32_select_periph(GPIO_PIOB_BASE, HAMMERHEAD_FPGA_PERIPH_SCK,
                     GPIO_PERIPH_B, 0);
      at32_select_periph(GPIO_PIOB_BASE, HAMMERHEAD_FPGA_PERIPH_MOSI,
                     GPIO_PERIPH_B, 0);

      /* reserve all other needed gpio
       * We have on board pull ups, so there is no need
       * to enable gpio pull ups */
      /* INIT_DONE (input) */
      at32_select_gpio(GPIO_PIN_PB(0), 0);

      /* nSTATUS (input) */
      at32_select_gpio(GPIO_PIN_PB(2), 0);

      /* nCONFIG (output, low) */
      at32_select_gpio(GPIO_PIN_PB(3), AT32_GPIOF_OUTPUT);

      /* CONF_DONE (input) */
      at32_select_gpio(GPIO_PIN_PB(4), 0);

      /* Select EXTINT3 for PB28 (Interrupt from FPGA) */
      at32_select_periph(GPIO_PIOB_BASE, HAMMERHEAD_FPGA_PERIPH_EXTINT3,
                     GPIO_PERIPH_A, 0);

      /* Get our parent clock */
      hh_fpga0_spi_clk.parent = clk_get(NULL, "pba");
      clk_put(hh_fpga0_spi_clk.parent);

      /* Register clock in at32 clock tree */
      at32_clk_register(&hh_fpga0_spi_clk);

      platform_device_register(&hh_fpga0_device);
      return &hh_fpga0_device;
}
#endif

/* This needs to be called after the SMC has been initialized */
static int __init hammerhead_flash_init(void)
{
      int ret;

      smc_set_timing(&flash_config, &flash_timing);
      ret = smc_set_configuration(0, &flash_config);

      if (ret < 0) {
            printk(KERN_ERR "hammerhead: failed to set NOR flash timing\n");
            return ret;
      }

      platform_device_register(&flash_device);

#ifdef CONFIG_BOARD_HAMMERHEAD_USB
      hammerhead_usbh_init();
#endif

#ifdef CONFIG_BOARD_HAMMERHEAD_FPGA
      /* Setup SMC for FPGA interface */
      smc_set_timing(&fpga_config, &fpga_timing);
      ret = smc_set_configuration(3, &fpga_config);
#endif


      if (ret < 0) {
            printk(KERN_ERR "hammerhead: failed to set FPGA timing\n");
            return ret;
      }

      return 0;
}

device_initcall(hammerhead_flash_init);

Generated by  Doxygen 1.6.0   Back to index