flexcop-sram.c

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/*
 * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
 * flexcop-sram.c - functions for controlling the SRAM
 * see flexcop.c for copyright information
 */
#include "flexcop.h"

static void flexcop_sram_set_chip(struct flexcop_device *fc,
        flexcop_sram_type_t type)
{
    flexcop_set_ibi_value(wan_ctrl_reg_71c, sram_chip, type);
}

int flexcop_sram_init(struct flexcop_device *fc)
{
    switch (fc->rev) {
    case FLEXCOP_II:
    case FLEXCOP_IIB:
        flexcop_sram_set_chip(fc, FC_SRAM_1_32KB);
        break;
    case FLEXCOP_III:
        flexcop_sram_set_chip(fc, FC_SRAM_1_48KB);
        break;
    default:
        return -EINVAL;
    }
    return 0;
}

int flexcop_sram_set_dest(struct flexcop_device *fc, flexcop_sram_dest_t dest,
         flexcop_sram_dest_target_t target)
{
    flexcop_ibi_value v;
    v = fc->read_ibi_reg(fc, sram_dest_reg_714);

    if (fc->rev != FLEXCOP_III && target == FC_SRAM_DEST_TARGET_FC3_CA) {
        err("SRAM destination target to available on FlexCopII(b)\n");
        return -EINVAL;
    }
    deb_sram("sram dest: %x target: %x\n", dest, target);

    if (dest & FC_SRAM_DEST_NET)
        v.sram_dest_reg_714.NET_Dest = target;
    if (dest & FC_SRAM_DEST_CAI)
        v.sram_dest_reg_714.CAI_Dest = target;
    if (dest & FC_SRAM_DEST_CAO)
        v.sram_dest_reg_714.CAO_Dest = target;
    if (dest & FC_SRAM_DEST_MEDIA)
        v.sram_dest_reg_714.MEDIA_Dest = target;

    fc->write_ibi_reg(fc,sram_dest_reg_714,v);
    udelay(1000); /* TODO delay really necessary */

    return 0;
}
EXPORT_SYMBOL(flexcop_sram_set_dest);

void flexcop_wan_set_speed(struct flexcop_device *fc, flexcop_wan_speed_t s)
{
    flexcop_set_ibi_value(wan_ctrl_reg_71c,wan_speed_sig,s);
}
EXPORT_SYMBOL(flexcop_wan_set_speed);

void flexcop_sram_ctrl(struct flexcop_device *fc, int usb_wan, int sramdma, int maximumfill)
{
    flexcop_ibi_value v = fc->read_ibi_reg(fc,sram_dest_reg_714);
    v.sram_dest_reg_714.ctrl_usb_wan = usb_wan;
    v.sram_dest_reg_714.ctrl_sramdma = sramdma;
    v.sram_dest_reg_714.ctrl_maximumfill = maximumfill;
    fc->write_ibi_reg(fc,sram_dest_reg_714,v);
}
EXPORT_SYMBOL(flexcop_sram_ctrl);

#if 0
static void flexcop_sram_write(struct adapter *adapter, u32 bank, u32 addr, u8 *buf, u32 len)
{
    int i, retries;
    u32 command;

    for (i = 0; i < len; i++) {
        command = bank | addr | 0x04000000 | (*buf << 0x10);

        retries = 2;

        while (((read_reg_dw(adapter, 0x700) & 0x80000000) != 0) && (retries > 0)) {
            mdelay(1);
            retries--;
        };

        if (retries == 0)
            printk("%s: SRAM timeout\n", __func__);

        write_reg_dw(adapter, 0x700, command);

        buf++;
        addr++;
    }
}

static void flex_sram_read(struct adapter *adapter, u32 bank, u32 addr, u8 *buf, u32 len)
{
    int i, retries;
    u32 command, value;

    for (i = 0; i < len; i++) {
        command = bank | addr | 0x04008000;

        retries = 10000;

        while (((read_reg_dw(adapter, 0x700) & 0x80000000) != 0) && (retries > 0)) {
            mdelay(1);
            retries--;
        };

        if (retries == 0)
            printk("%s: SRAM timeout\n", __func__);

        write_reg_dw(adapter, 0x700, command);

        retries = 10000;

        while (((read_reg_dw(adapter, 0x700) & 0x80000000) != 0) && (retries > 0)) {
            mdelay(1);
            retries--;
        };

        if (retries == 0)
            printk("%s: SRAM timeout\n", __func__);

        value = read_reg_dw(adapter, 0x700) >> 0x10;

        *buf = (value & 0xff);

        addr++;
        buf++;
    }
}

static void sram_write_chunk(struct adapter *adapter, u32 addr, u8 *buf, u16 len)
{
    u32 bank;

    bank = 0;

    if (adapter->dw_sram_type == 0x20000) {
        bank = (addr & 0x18000) << 0x0d;
    }

    if (adapter->dw_sram_type == 0x00000) {
        if ((addr >> 0x0f) == 0)
            bank = 0x20000000;
        else
            bank = 0x10000000;
    }
    flex_sram_write(adapter, bank, addr & 0x7fff, buf, len);
}

static void sram_read_chunk(struct adapter *adapter, u32 addr, u8 *buf, u16 len)
{
    u32 bank;
    bank = 0;

    if (adapter->dw_sram_type == 0x20000) {
        bank = (addr & 0x18000) << 0x0d;
    }

    if (adapter->dw_sram_type == 0x00000) {
        if ((addr >> 0x0f) == 0)
            bank = 0x20000000;
        else
            bank = 0x10000000;
    }
    flex_sram_read(adapter, bank, addr & 0x7fff, buf, len);
}

static void sram_read(struct adapter *adapter, u32 addr, u8 *buf, u32 len)
{
    u32 length;
    while (len != 0) {
        length = len;
        /* check if the address range belongs to the same
         * 32K memory chip. If not, the data is read
         * from one chip at a time */
        if ((addr >> 0x0f) != ((addr + len - 1) >> 0x0f)) {
            length = (((addr >> 0x0f) + 1) << 0x0f) - addr;
        }

        sram_read_chunk(adapter, addr, buf, length);
        addr = addr + length;
        buf = buf + length;
        len = len - length;
    }
}

static void sram_write(struct adapter *adapter, u32 addr, u8 *buf, u32 len)
{
    u32 length;
    while (len != 0) {
        length = len;

        /* check if the address range belongs to the same
         * 32K memory chip. If not, the data is
         * written to one chip at a time */
        if ((addr >> 0x0f) != ((addr + len - 1) >> 0x0f)) {
            length = (((addr >> 0x0f) + 1) << 0x0f) - addr;
        }

        sram_write_chunk(adapter, addr, buf, length);
        addr = addr + length;
        buf = buf + length;
        len = len - length;
    }
}

static void sram_set_size(struct adapter *adapter, u32 mask)
{
    write_reg_dw(adapter, 0x71c,
            (mask | (~0x30000 & read_reg_dw(adapter, 0x71c))));
}

static void sram_init(struct adapter *adapter)
{
    u32 tmp;
    tmp = read_reg_dw(adapter, 0x71c);
    write_reg_dw(adapter, 0x71c, 1);

    if (read_reg_dw(adapter, 0x71c) != 0) {
        write_reg_dw(adapter, 0x71c, tmp);
        adapter->dw_sram_type = tmp & 0x30000;
        ddprintk("%s: dw_sram_type = %x\n", __func__, adapter->dw_sram_type);
    } else {
        adapter->dw_sram_type = 0x10000;
        ddprintk("%s: dw_sram_type = %x\n", __func__, adapter->dw_sram_type);
    }
}

static int sram_test_location(struct adapter *adapter, u32 mask, u32 addr)
{
    u8 tmp1, tmp2;
    dprintk("%s: mask = %x, addr = %x\n", __func__, mask, addr);

    sram_set_size(adapter, mask);
    sram_init(adapter);

    tmp2 = 0xa5;
    tmp1 = 0x4f;

    sram_write(adapter, addr, &tmp2, 1);
    sram_write(adapter, addr + 4, &tmp1, 1);

    tmp2 = 0;
    mdelay(20);

    sram_read(adapter, addr, &tmp2, 1);
    sram_read(adapter, addr, &tmp2, 1);

    dprintk("%s: wrote 0xa5, read 0x%2x\n", __func__, tmp2);

    if (tmp2 != 0xa5)
        return 0;

    tmp2 = 0x5a;
    tmp1 = 0xf4;

    sram_write(adapter, addr, &tmp2, 1);
    sram_write(adapter, addr + 4, &tmp1, 1);

    tmp2 = 0;
    mdelay(20);

    sram_read(adapter, addr, &tmp2, 1);
    sram_read(adapter, addr, &tmp2, 1);

    dprintk("%s: wrote 0x5a, read 0x%2x\n", __func__, tmp2);

    if (tmp2 != 0x5a)
        return 0;
    return 1;
}

static u32 sram_length(struct adapter *adapter)
{
    if (adapter->dw_sram_type == 0x10000)
        return 32768; /* 32K */
    if (adapter->dw_sram_type == 0x00000)
        return 65536; /* 64K */
    if (adapter->dw_sram_type == 0x20000)
        return 131072; /* 128K */
    return 32768; /* 32K */
}

/* FlexcopII can work with 32K, 64K or 128K of external SRAM memory.
   - for 128K there are 4x32K chips at bank 0,1,2,3.
   - for  64K there are 2x32K chips at bank 1,2.
   - for  32K there is one 32K chip at bank 0.

   FlexCop works only with one bank at a time. The bank is selected
   by bits 28-29 of the 0x700 register.

   bank 0 covers addresses 0x00000-0x07fff
   bank 1 covers addresses 0x08000-0x0ffff
   bank 2 covers addresses 0x10000-0x17fff
   bank 3 covers addresses 0x18000-0x1ffff */

static int flexcop_sram_detect(struct flexcop_device *fc)
{
    flexcop_ibi_value r208, r71c_0, vr71c_1;
    r208 = fc->read_ibi_reg(fc, ctrl_208);
    fc->write_ibi_reg(fc, ctrl_208, ibi_zero);

    r71c_0 = fc->read_ibi_reg(fc, wan_ctrl_reg_71c);
    write_reg_dw(adapter, 0x71c, 1);
    tmp3 = read_reg_dw(adapter, 0x71c);
    dprintk("%s: tmp3 = %x\n", __func__, tmp3);
    write_reg_dw(adapter, 0x71c, tmp2);

    // check for internal SRAM ???
    tmp3--;
    if (tmp3 != 0) {
        sram_set_size(adapter, 0x10000);
        sram_init(adapter);
        write_reg_dw(adapter, 0x208, tmp);
        dprintk("%s: sram size = 32K\n", __func__);
        return 32;
    }

    if (sram_test_location(adapter, 0x20000, 0x18000) != 0) {
        sram_set_size(adapter, 0x20000);
        sram_init(adapter);
        write_reg_dw(adapter, 0x208, tmp);
        dprintk("%s: sram size = 128K\n", __func__);
        return 128;
    }

    if (sram_test_location(adapter, 0x00000, 0x10000) != 0) {
        sram_set_size(adapter, 0x00000);
        sram_init(adapter);
        write_reg_dw(adapter, 0x208, tmp);
        dprintk("%s: sram size = 64K\n", __func__);
        return 64;
    }

    if (sram_test_location(adapter, 0x10000, 0x00000) != 0) {
        sram_set_size(adapter, 0x10000);
        sram_init(adapter);
        write_reg_dw(adapter, 0x208, tmp);
        dprintk("%s: sram size = 32K\n", __func__);
        return 32;
    }

    sram_set_size(adapter, 0x10000);
    sram_init(adapter);
    write_reg_dw(adapter, 0x208, tmp);
    dprintk("%s: SRAM detection failed. Set to 32K \n", __func__);
    return 0;
}

static void sll_detect_sram_size(struct adapter *adapter)
{
    sram_detect_for_flex2(adapter);
}

#endif