OMAP: add TI OMAP1 external LCD controller support - SoSSI

- Adds support for Texas Instruments OMAP1 processors boards connected with
  external LCD controller through "Special OptimiSed Screen Interface"

Signed-off-by: Trilok Soni <soni.trilok@gmail.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 695 insertions, 0 deletions

diff --git a/drivers/video/omap/Kconfig b/drivers/video/omap/Kconfig
index d27db84ecc6a..17607e97ba32 100644
--- a/drivers/video/omap/Kconfig
+++ b/drivers/video/omap/Kconfig
@@ -36,3 +36,10 @@ config FB_OMAP_DMA_TUNE
           answer yes. Answer no if you have a dedicated video
           memory, or don't use any of the accelerated features.
 
+config FB_OMAP_LCDC_EXTERNAL
+        bool "External LCD controller support"
+        depends on FB_OMAP
+        help
+          Say Y here, if you want to have support for boards with an
+          external LCD controller connected to the SoSSI/RFBI interface.
+
diff --git a/drivers/video/omap/Makefile b/drivers/video/omap/Makefile
index 10b5647a8f4f..5289bf91c2c9 100644
--- a/drivers/video/omap/Makefile
+++ b/drivers/video/omap/Makefile
@@ -9,5 +9,7 @@ objs-yy := omapfb_main.o
 objs-y$(CONFIG_ARCH_OMAP1) += lcdc.o
 objs-y$(CONFIG_ARCH_OMAP2) += dispc.o
 
+objs-$(CONFIG_ARCH_OMAP1)$(CONFIG_FB_OMAP_LCDC_EXTERNAL) += sossi.o
+
 omapfb-objs := $(objs-yy)
 
diff --git a/drivers/video/omap/sossi.c b/drivers/video/omap/sossi.c
new file mode 100644
index 000000000000..81dbcf53cf0e
--- /dev/null
+++ b/drivers/video/omap/sossi.c
@@ -0,0 +1,686 @@
+/*
+ * OMAP1 Special OptimiSed Screen Interface support
+ *
+ * Copyright (C) 2004-2005 Nokia Corporation
+ * Author: Juha Yrjölä <juha.yrjola@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/clk.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <asm/arch/dma.h>
+#include <asm/arch/omapfb.h>
+
+#include "lcdc.h"
+
+#define MODULE_NAME             "omapfb-sossi"
+
+#define OMAP_SOSSI_BASE         0xfffbac00
+#define SOSSI_ID_REG            0x00
+#define SOSSI_INIT1_REG         0x04
+#define SOSSI_INIT2_REG         0x08
+#define SOSSI_INIT3_REG         0x0c
+#define SOSSI_FIFO_REG          0x10
+#define SOSSI_REOTABLE_REG      0x14
+#define SOSSI_TEARING_REG       0x18
+#define SOSSI_INIT1B_REG        0x1c
+#define SOSSI_FIFOB_REG         0x20
+
+#define DMA_GSCR          0xfffedc04
+#define DMA_LCD_CCR       0xfffee3c2
+#define DMA_LCD_CTRL      0xfffee3c4
+#define DMA_LCD_LCH_CTRL  0xfffee3ea
+
+#define CONF_SOSSI_RESET_R      (1 << 23)
+
+#define RD_ACCESS               0
+#define WR_ACCESS               1
+
+#define SOSSI_MAX_XMIT_BYTES    (512 * 1024)
+
+static struct {
+        void __iomem    *base;
+        struct clk      *fck;
+        unsigned long   fck_hz;
+        spinlock_t      lock;
+        int             bus_pick_count;
+        int             bus_pick_width;
+        int             tearsync_mode;
+        int             tearsync_line;
+        void            (*lcdc_callback)(void *data);
+        void            *lcdc_callback_data;
+        int             vsync_dma_pending;
+        /* timing for read and write access */
+        int             clk_div;
+        u8              clk_tw0[2];
+        u8              clk_tw1[2];
+        /*
+         * if last_access is the same as current we don't have to change
+         * the timings
+         */
+        int             last_access;
+
+        struct omapfb_device    *fbdev;
+} sossi;
+
+static inline u32 sossi_read_reg(int reg)
+{
+        return readl(sossi.base + reg);
+}
+
+static inline u16 sossi_read_reg16(int reg)
+{
+        return readw(sossi.base + reg);
+}
+
+static inline u8 sossi_read_reg8(int reg)
+{
+        return readb(sossi.base + reg);
+}
+
+static inline void sossi_write_reg(int reg, u32 value)
+{
+        writel(value, sossi.base + reg);
+}
+
+static inline void sossi_write_reg16(int reg, u16 value)
+{
+        writew(value, sossi.base + reg);
+}
+
+static inline void sossi_write_reg8(int reg, u8 value)
+{
+        writeb(value, sossi.base + reg);
+}
+
+static void sossi_set_bits(int reg, u32 bits)
+{
+        sossi_write_reg(reg, sossi_read_reg(reg) | bits);
+}
+
+static void sossi_clear_bits(int reg, u32 bits)
+{
+        sossi_write_reg(reg, sossi_read_reg(reg) & ~bits);
+}
+
+#define HZ_TO_PS(x)     (1000000000 / (x / 1000))
+
+static u32 ps_to_sossi_ticks(u32 ps, int div)
+{
+        u32 clk_period = HZ_TO_PS(sossi.fck_hz) * div;
+        return (clk_period + ps - 1) / clk_period;
+}
+
+static int calc_rd_timings(struct extif_timings *t)
+{
+        u32 tw0, tw1;
+        int reon, reoff, recyc, actim;
+        int div = t->clk_div;
+
+        /*
+         * Make sure that after conversion it still holds that:
+         * reoff > reon, recyc >= reoff, actim > reon
+         */
+        reon = ps_to_sossi_ticks(t->re_on_time, div);
+        /* reon will be exactly one sossi tick */
+        if (reon > 1)
+                return -1;
+
+        reoff = ps_to_sossi_ticks(t->re_off_time, div);
+
+        if (reoff <= reon)
+                reoff = reon + 1;
+
+        tw0 = reoff - reon;
+        if (tw0 > 0x10)
+                return -1;
+
+        recyc = ps_to_sossi_ticks(t->re_cycle_time, div);
+        if (recyc <= reoff)
+                recyc = reoff + 1;
+
+        tw1 = recyc - tw0;
+        /* values less then 3 result in the SOSSI block resetting itself */
+        if (tw1 < 3)
+                tw1 = 3;
+        if (tw1 > 0x40)
+                return -1;
+
+        actim = ps_to_sossi_ticks(t->access_time, div);
+        if (actim < reoff)
+                actim++;
+        /*
+         * access time (data hold time) will be exactly one sossi
+         * tick
+         */
+        if (actim - reoff > 1)
+                return -1;
+
+        t->tim[0] = tw0 - 1;
+        t->tim[1] = tw1 - 1;
+
+        return 0;
+}
+
+static int calc_wr_timings(struct extif_timings *t)
+{
+        u32 tw0, tw1;
+        int weon, weoff, wecyc;
+        int div = t->clk_div;
+
+        /*
+         * Make sure that after conversion it still holds that:
+         * weoff > weon, wecyc >= weoff
+         */
+        weon = ps_to_sossi_ticks(t->we_on_time, div);
+        /* weon will be exactly one sossi tick */
+        if (weon > 1)
+                return -1;
+
+        weoff = ps_to_sossi_ticks(t->we_off_time, div);
+        if (weoff <= weon)
+                weoff = weon + 1;
+        tw0 = weoff - weon;
+        if (tw0 > 0x10)
+                return -1;
+
+        wecyc = ps_to_sossi_ticks(t->we_cycle_time, div);
+        if (wecyc <= weoff)
+                wecyc = weoff + 1;
+
+        tw1 = wecyc - tw0;
+        /* values less then 3 result in the SOSSI block resetting itself */
+        if (tw1 < 3)
+                tw1 = 3;
+        if (tw1 > 0x40)
+                return -1;
+
+        t->tim[2] = tw0 - 1;
+        t->tim[3] = tw1 - 1;
+
+        return 0;
+}
+
+static void _set_timing(int div, int tw0, int tw1)
+{
+        u32 l;
+
+#ifdef VERBOSE
+        dev_dbg(sossi.fbdev->dev, "Using TW0 = %d, TW1 = %d, div = %d\n",
+                 tw0 + 1, tw1 + 1, div);
+#endif
+
+        clk_set_rate(sossi.fck, sossi.fck_hz / div);
+        clk_enable(sossi.fck);
+        l = sossi_read_reg(SOSSI_INIT1_REG);
+        l &= ~((0x0f << 20) | (0x3f << 24));
+        l |= (tw0 << 20) | (tw1 << 24);
+        sossi_write_reg(SOSSI_INIT1_REG, l);
+        clk_disable(sossi.fck);
+}
+
+static void _set_bits_per_cycle(int bus_pick_count, int bus_pick_width)
+{
+        u32 l;
+
+        l = sossi_read_reg(SOSSI_INIT3_REG);
+        l &= ~0x3ff;
+        l |= ((bus_pick_count - 1) << 5) | ((bus_pick_width - 1) & 0x1f);
+        sossi_write_reg(SOSSI_INIT3_REG, l);
+}
+
+static void _set_tearsync_mode(int mode, unsigned line)
+{
+        u32 l;
+
+        l = sossi_read_reg(SOSSI_TEARING_REG);
+        l &= ~(((1 << 11) - 1) << 15);
+        l |= line << 15;
+        l &= ~(0x3 << 26);
+        l |= mode << 26;
+        sossi_write_reg(SOSSI_TEARING_REG, l);
+        if (mode)
+                sossi_set_bits(SOSSI_INIT2_REG, 1 << 6);        /* TE logic */
+        else
+                sossi_clear_bits(SOSSI_INIT2_REG, 1 << 6);
+}
+
+static inline void set_timing(int access)
+{
+        if (access != sossi.last_access) {
+                sossi.last_access = access;
+                _set_timing(sossi.clk_div,
+                            sossi.clk_tw0[access], sossi.clk_tw1[access]);
+        }
+}
+
+static void sossi_start_transfer(void)
+{
+        /* WE */
+        sossi_clear_bits(SOSSI_INIT2_REG, 1 << 4);
+        /* CS active low */
+        sossi_clear_bits(SOSSI_INIT1_REG, 1 << 30);
+}
+
+static void sossi_stop_transfer(void)
+{
+        /* WE */
+        sossi_set_bits(SOSSI_INIT2_REG, 1 << 4);
+        /* CS active low */
+        sossi_set_bits(SOSSI_INIT1_REG, 1 << 30);
+}
+
+static void wait_end_of_write(void)
+{
+        /* Before reading we must check if some writings are going on */
+        while (!(sossi_read_reg(SOSSI_INIT2_REG) & (1 << 3)));
+}
+
+static void send_data(const void *data, unsigned int len)
+{
+        while (len >= 4) {
+                sossi_write_reg(SOSSI_FIFO_REG, *(const u32 *) data);
+                len -= 4;
+                data += 4;
+        }
+        while (len >= 2) {
+                sossi_write_reg16(SOSSI_FIFO_REG, *(const u16 *) data);
+                len -= 2;
+                data += 2;
+        }
+        while (len) {
+                sossi_write_reg8(SOSSI_FIFO_REG, *(const u8 *) data);
+                len--;
+                data++;
+        }
+}
+
+static void set_cycles(unsigned int len)
+{
+        unsigned long nr_cycles = len / (sossi.bus_pick_width / 8);
+
+        BUG_ON((nr_cycles - 1) & ~0x3ffff);
+
+        sossi_clear_bits(SOSSI_INIT1_REG, 0x3ffff);
+        sossi_set_bits(SOSSI_INIT1_REG, (nr_cycles - 1) & 0x3ffff);
+}
+
+static int sossi_convert_timings(struct extif_timings *t)
+{
+        int r = 0;
+        int div = t->clk_div;
+
+        t->converted = 0;
+
+        if (div <= 0 || div > 8)
+                return -1;
+
+        /* no CS on SOSSI, so ignore cson, csoff, cs_pulsewidth */
+        if ((r = calc_rd_timings(t)) < 0)
+                return r;
+
+        if ((r = calc_wr_timings(t)) < 0)
+                return r;
+
+        t->tim[4] = div;
+
+        t->converted = 1;
+
+        return 0;
+}
+
+static void sossi_set_timings(const struct extif_timings *t)
+{
+        BUG_ON(!t->converted);
+
+        sossi.clk_tw0[RD_ACCESS] = t->tim[0];
+        sossi.clk_tw1[RD_ACCESS] = t->tim[1];
+
+        sossi.clk_tw0[WR_ACCESS] = t->tim[2];
+        sossi.clk_tw1[WR_ACCESS] = t->tim[3];
+
+        sossi.clk_div = t->tim[4];
+}
+
+static void sossi_get_clk_info(u32 *clk_period, u32 *max_clk_div)
+{
+        *clk_period = HZ_TO_PS(sossi.fck_hz);
+        *max_clk_div = 8;
+}
+
+static void sossi_set_bits_per_cycle(int bpc)
+{
+        int bus_pick_count, bus_pick_width;
+
+        /*
+         * We set explicitly the the bus_pick_count as well, although
+         * with remapping/reordering disabled it will be calculated by HW
+         * as (32 / bus_pick_width).
+         */
+        switch (bpc) {
+        case 8:
+                bus_pick_count = 4;
+                bus_pick_width = 8;
+                break;
+        case 16:
+                bus_pick_count = 2;
+                bus_pick_width = 16;
+                break;
+        default:
+                BUG();
+                return;
+        }
+        sossi.bus_pick_width = bus_pick_width;
+        sossi.bus_pick_count = bus_pick_count;
+}
+
+static int sossi_setup_tearsync(unsigned pin_cnt,
+                                unsigned hs_pulse_time, unsigned vs_pulse_time,
+                                int hs_pol_inv, int vs_pol_inv, int div)
+{
+        int hs, vs;
+        u32 l;
+
+        if (pin_cnt != 1 || div < 1 || div > 8)
+                return -EINVAL;
+
+        hs = ps_to_sossi_ticks(hs_pulse_time, div);
+        vs = ps_to_sossi_ticks(vs_pulse_time, div);
+        if (vs < 8 || vs <= hs || vs >= (1 << 12))
+                return -EDOM;
+        vs /= 8;
+        vs--;
+        if (hs > 8)
+                hs = 8;
+        if (hs)
+                hs--;
+
+        dev_dbg(sossi.fbdev->dev,
+                "setup_tearsync: hs %d vs %d hs_inv %d vs_inv %d\n",
+                hs, vs, hs_pol_inv, vs_pol_inv);
+
+        clk_enable(sossi.fck);
+        l = sossi_read_reg(SOSSI_TEARING_REG);
+        l &= ~((1 << 15) - 1);
+        l |= vs << 3;
+        l |= hs;
+        if (hs_pol_inv)
+                l |= 1 << 29;
+        else
+                l &= ~(1 << 29);
+        if (vs_pol_inv)
+                l |= 1 << 28;
+        else
+                l &= ~(1 << 28);
+        sossi_write_reg(SOSSI_TEARING_REG, l);
+        clk_disable(sossi.fck);
+
+        return 0;
+}
+
+static int sossi_enable_tearsync(int enable, unsigned line)
+{
+        int mode;
+
+        dev_dbg(sossi.fbdev->dev, "tearsync %d line %d\n", enable, line);
+        if (line >= 1 << 11)
+                return -EINVAL;
+        if (enable) {
+                if (line)
+                        mode = 2;               /* HS or VS */
+                else
+                        mode = 3;               /* VS only */
+        } else
+                mode = 0;
+        sossi.tearsync_line = line;
+        sossi.tearsync_mode = mode;
+
+        return 0;
+}
+
+static void sossi_write_command(const void *data, unsigned int len)
+{
+        clk_enable(sossi.fck);
+        set_timing(WR_ACCESS);
+        _set_bits_per_cycle(sossi.bus_pick_count, sossi.bus_pick_width);
+        /* CMD#/DATA */
+        sossi_clear_bits(SOSSI_INIT1_REG, 1 << 18);
+        set_cycles(len);
+        sossi_start_transfer();
+        send_data(data, len);
+        sossi_stop_transfer();
+        wait_end_of_write();
+        clk_disable(sossi.fck);
+}
+
+static void sossi_write_data(const void *data, unsigned int len)
+{
+        clk_enable(sossi.fck);
+        set_timing(WR_ACCESS);
+        _set_bits_per_cycle(sossi.bus_pick_count, sossi.bus_pick_width);
+        /* CMD#/DATA */
+        sossi_set_bits(SOSSI_INIT1_REG, 1 << 18);
+        set_cycles(len);
+        sossi_start_transfer();
+        send_data(data, len);
+        sossi_stop_transfer();
+        wait_end_of_write();
+        clk_disable(sossi.fck);
+}
+
+static void sossi_transfer_area(int width, int height,
+                                void (callback)(void *data), void *data)
+{
+        BUG_ON(callback == NULL);
+
+        sossi.lcdc_callback = callback;
+        sossi.lcdc_callback_data = data;
+
+        clk_enable(sossi.fck);
+        set_timing(WR_ACCESS);
+        _set_bits_per_cycle(sossi.bus_pick_count, sossi.bus_pick_width);
+        _set_tearsync_mode(sossi.tearsync_mode, sossi.tearsync_line);
+        /* CMD#/DATA */
+        sossi_set_bits(SOSSI_INIT1_REG, 1 << 18);
+        set_cycles(width * height * sossi.bus_pick_width / 8);
+
+        sossi_start_transfer();
+        if (sossi.tearsync_mode) {
+                /*
+                 * Wait for the sync signal and start the transfer only
+                 * then. We can't seem to be able to use HW sync DMA for
+                 * this since LCD DMA shows huge latencies, as if it
+                 * would ignore some of the DMA requests from SoSSI.
+                 */
+                unsigned long flags;
+
+                spin_lock_irqsave(&sossi.lock, flags);
+                sossi.vsync_dma_pending++;
+                spin_unlock_irqrestore(&sossi.lock, flags);
+        } else
+                /* Just start the transfer right away. */
+                omap_enable_lcd_dma();
+}
+
+static void sossi_dma_callback(void *data)
+{
+        omap_stop_lcd_dma();
+        sossi_stop_transfer();
+        clk_disable(sossi.fck);
+        sossi.lcdc_callback(sossi.lcdc_callback_data);
+}
+
+static void sossi_read_data(void *data, unsigned int len)
+{
+        clk_enable(sossi.fck);
+        set_timing(RD_ACCESS);
+        _set_bits_per_cycle(sossi.bus_pick_count, sossi.bus_pick_width);
+        /* CMD#/DATA */
+        sossi_set_bits(SOSSI_INIT1_REG, 1 << 18);
+        set_cycles(len);
+        sossi_start_transfer();
+        while (len >= 4) {
+                *(u32 *) data = sossi_read_reg(SOSSI_FIFO_REG);
+                len -= 4;
+                data += 4;
+        }
+        while (len >= 2) {
+                *(u16 *) data = sossi_read_reg16(SOSSI_FIFO_REG);
+                len -= 2;
+                data += 2;
+        }
+        while (len) {
+                *(u8 *) data = sossi_read_reg8(SOSSI_FIFO_REG);
+                len--;
+                data++;
+        }
+        sossi_stop_transfer();
+        clk_disable(sossi.fck);
+}
+
+static irqreturn_t sossi_match_irq(int irq, void *data)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&sossi.lock, flags);
+        if (sossi.vsync_dma_pending) {
+                sossi.vsync_dma_pending--;
+                omap_enable_lcd_dma();
+        }
+        spin_unlock_irqrestore(&sossi.lock, flags);
+        return IRQ_HANDLED;
+}
+
+static int sossi_init(struct omapfb_device *fbdev)
+{
+        u32 l, k;
+        struct clk *fck;
+        struct clk *dpll1out_ck;
+        int r;
+
+        sossi.base = (void __iomem *)IO_ADDRESS(OMAP_SOSSI_BASE);
+        sossi.fbdev = fbdev;
+        spin_lock_init(&sossi.lock);
+
+        dpll1out_ck = clk_get(fbdev->dev, "ck_dpll1out");
+        if (IS_ERR(dpll1out_ck)) {
+                dev_err(fbdev->dev, "can't get DPLL1OUT clock\n");
+                return PTR_ERR(dpll1out_ck);
+        }
+        /*
+         * We need the parent clock rate, which we might divide further
+         * depending on the timing requirements of the controller. See
+         * _set_timings.
+         */
+        sossi.fck_hz = clk_get_rate(dpll1out_ck);
+        clk_put(dpll1out_ck);
+
+        fck = clk_get(fbdev->dev, "ck_sossi");
+        if (IS_ERR(fck)) {
+                dev_err(fbdev->dev, "can't get SoSSI functional clock\n");
+                return PTR_ERR(fck);
+        }
+        sossi.fck = fck;
+
+        /* Reset and enable the SoSSI module */
+        l = omap_readl(MOD_CONF_CTRL_1);
+        l |= CONF_SOSSI_RESET_R;
+        omap_writel(l, MOD_CONF_CTRL_1);
+        l &= ~CONF_SOSSI_RESET_R;
+        omap_writel(l, MOD_CONF_CTRL_1);
+
+        clk_enable(sossi.fck);
+        l = omap_readl(ARM_IDLECT2);
+        l &= ~(1 << 8);                 /* DMACK_REQ */
+        omap_writel(l, ARM_IDLECT2);
+
+        l = sossi_read_reg(SOSSI_INIT2_REG);
+        /* Enable and reset the SoSSI block */
+        l |= (1 << 0) | (1 << 1);
+        sossi_write_reg(SOSSI_INIT2_REG, l);
+        /* Take SoSSI out of reset */
+        l &= ~(1 << 1);
+        sossi_write_reg(SOSSI_INIT2_REG, l);
+
+        sossi_write_reg(SOSSI_ID_REG, 0);
+        l = sossi_read_reg(SOSSI_ID_REG);
+        k = sossi_read_reg(SOSSI_ID_REG);
+
+        if (l != 0x55555555 || k != 0xaaaaaaaa) {
+                dev_err(fbdev->dev,
+                        "invalid SoSSI sync pattern: %08x, %08x\n", l, k);
+                r = -ENODEV;
+                goto err;
+        }
+
+        if ((r = omap_lcdc_set_dma_callback(sossi_dma_callback, NULL)) < 0) {
+                dev_err(fbdev->dev, "can't get LCDC IRQ\n");
+                r = -ENODEV;
+                goto err;
+        }
+
+        l = sossi_read_reg(SOSSI_ID_REG); /* Component code */
+        l = sossi_read_reg(SOSSI_ID_REG);
+        dev_info(fbdev->dev, "SoSSI version %d.%d initialized\n",
+                l >> 16, l & 0xffff);
+
+        l = sossi_read_reg(SOSSI_INIT1_REG);
+        l |= (1 << 19); /* DMA_MODE */
+        l &= ~(1 << 31); /* REORDERING */
+        sossi_write_reg(SOSSI_INIT1_REG, l);
+
+        if ((r = request_irq(INT_1610_SoSSI_MATCH, sossi_match_irq,
+                             IRQT_FALLING,
+             "sossi_match", sossi.fbdev->dev)) < 0) {
+                dev_err(sossi.fbdev->dev, "can't get SoSSI match IRQ\n");
+                goto err;
+        }
+
+        clk_disable(sossi.fck);
+        return 0;
+
+err:
+        clk_disable(sossi.fck);
+        clk_put(sossi.fck);
+        return r;
+}
+
+static void sossi_cleanup(void)
+{
+        omap_lcdc_free_dma_callback();
+        clk_put(sossi.fck);
+}
+
+struct lcd_ctrl_extif omap1_ext_if = {
+        .init                   = sossi_init,
+        .cleanup                = sossi_cleanup,
+        .get_clk_info           = sossi_get_clk_info,
+        .convert_timings        = sossi_convert_timings,
+        .set_timings            = sossi_set_timings,
+        .set_bits_per_cycle     = sossi_set_bits_per_cycle,
+        .setup_tearsync         = sossi_setup_tearsync,
+        .enable_tearsync        = sossi_enable_tearsync,
+        .write_command          = sossi_write_command,
+        .read_data              = sossi_read_data,
+        .write_data             = sossi_write_data,
+        .transfer_area          = sossi_transfer_area,
+
+        .max_transmit_size      = SOSSI_MAX_XMIT_BYTES,
+};
+