/*
- * File: drivers/video/omap/omap2/rfbi.c
- *
* OMAP2 Remote Frame Buffer Interface support
*
* Copyright (C) 2005 Nokia Corporation
* 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/delay.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/interrupt.h>
+#include <linux/clk.h>
#include <asm/io.h>
-#include <asm/hardware/clock.h>
#include <asm/arch/omapfb.h>
#include "dispc.h"
-#define MODULE_NAME "omapfb-rfbi"
-
-#define pr_err(fmt, args...) printk(KERN_ERR MODULE_NAME ": " fmt, ## args)
+/* To work around an RFBI transfer rate limitation */
+#define OMAP_RFBI_RATE_LIMIT 1
#define RFBI_BASE 0x48050800
#define RFBI_REVISION 0x0000
void (*lcdc_callback)(void *data);
void *lcdc_callback_data;
unsigned long l4_khz;
+ int bits_per_cycle;
+ struct omapfb_device *fbdev;
+ struct clk *dss_ick;
+ struct clk *dss1_fck;
+ unsigned tearsync_pin_cnt;
+ unsigned tearsync_mode;
} rfbi;
static inline void rfbi_write_reg(int idx, u32 val)
return __raw_readl(rfbi.base + idx);
}
-static int ns_to_l4_ticks(int time)
+static int rfbi_get_clocks(void)
{
- unsigned long tick_ps;
- int ret;
+ if (IS_ERR((rfbi.dss_ick = clk_get(rfbi.fbdev->dev, "dss_ick")))) {
+ dev_err(rfbi.fbdev->dev, "can't get dss_ick");
+ return PTR_ERR(rfbi.dss_ick);
+ }
- /* Calculate in picosecs to yield more exact results */
- tick_ps = 1000000000 / (rfbi.l4_khz);
+ if (IS_ERR((rfbi.dss1_fck = clk_get(rfbi.fbdev->dev, "dss1_fck")))) {
+ dev_err(rfbi.fbdev->dev, "can't get dss1_fck");
+ clk_put(rfbi.dss_ick);
+ return PTR_ERR(rfbi.dss1_fck);
+ }
- ret = (time * 1000 + tick_ps - 1) / tick_ps;
+ return 0;
+}
- return ret * 2;
+static void rfbi_put_clocks(void)
+{
+ clk_put(rfbi.dss1_fck);
+ clk_put(rfbi.dss_ick);
}
-#ifdef OMAPFB_DBG
-static void print_timings(void)
+static void rfbi_enable_clocks(int enable)
+{
+ if (enable) {
+ clk_enable(rfbi.dss_ick);
+ clk_enable(rfbi.dss1_fck);
+ } else {
+ clk_disable(rfbi.dss1_fck);
+ clk_disable(rfbi.dss_ick);
+ }
+}
+
+
+#ifdef VERBOSE
+static void rfbi_print_timings(void)
{
u32 l;
+ u32 time;
- DBGPRINT(1, "Tick time %lu ps\n", 1000000000 / rfbi.l4_khz);
+ l = rfbi_read_reg(RFBI_CONFIG0);
+ time = 1000000000 / rfbi.l4_khz;
+ if (l & (1 << 4))
+ time *= 2;
+
+ dev_dbg(rfbi.fbdev->dev, "Tick time %u ps\n", time);
l = rfbi_read_reg(RFBI_ONOFF_TIME0);
- DBGPRINT(1, "CSONTIME %d, CSOFFTIME %d, WEONTIME %d, WEOFFTIME %d, "
- "REONTIME %d, REOFFTIME %d\n",
- l & 0x0f, (l >> 4) & 0x3f, (l >> 10) & 0x0f, (l >> 14) & 0x3f,
- (l >> 20) & 0x0f, (l >> 24) & 0x3f);
+ dev_dbg(rfbi.fbdev->dev,
+ "CSONTIME %d, CSOFFTIME %d, WEONTIME %d, WEOFFTIME %d, "
+ "REONTIME %d, REOFFTIME %d\n",
+ l & 0x0f, (l >> 4) & 0x3f, (l >> 10) & 0x0f, (l >> 14) & 0x3f,
+ (l >> 20) & 0x0f, (l >> 24) & 0x3f);
+
l = rfbi_read_reg(RFBI_CYCLE_TIME0);
- DBGPRINT(1, "WECYCLETIME %d, RECYCLETIME %d, CSPULSEWIDTH %d, "
- "ACCESSTIME %d\n",
- (l & 0x3f), (l >> 6) & 0x3f, (l >> 12) & 0x3f, (l >> 22) & 0x3f);
+ dev_dbg(rfbi.fbdev->dev,
+ "WECYCLETIME %d, RECYCLETIME %d, CSPULSEWIDTH %d, "
+ "ACCESSTIME %d\n",
+ (l & 0x3f), (l >> 6) & 0x3f, (l >> 12) & 0x3f,
+ (l >> 22) & 0x3f);
}
+#else
+static void rfbi_print_timings(void) {}
#endif
static void rfbi_set_timings(const struct extif_timings *t)
{
u32 l;
- int on, off;
-
- on = ns_to_l4_ticks(t->cs_on_time) & 0x0f;
- l = on;
- off = ns_to_l4_ticks(t->cs_off_time) & 0x3f;
- if (off <= on)
- off = on + 2;
- l |= off << 4;
-
- on = ns_to_l4_ticks(t->we_on_time) & 0x0f;
- l |= on << 10;
- off = ns_to_l4_ticks(t->we_off_time) & 0x3f;
- if (off <= on)
- off = on + 2;
- l |= off << 14;
-
- l |= (ns_to_l4_ticks(t->re_on_time) & 0x0f) << 20;
- l |= (ns_to_l4_ticks(t->re_off_time) & 0x3f) << 24;
- rfbi_write_reg(RFBI_ONOFF_TIME0, l);
-
- l = ns_to_l4_ticks(t->we_cycle_time) & 0x3f;
- l |= (ns_to_l4_ticks(t->re_cycle_time) & 0x3f) << 6;
- l |= (ns_to_l4_ticks(t->cs_pulse_width) & 0x3f) << 12;
- l |= (ns_to_l4_ticks(t->access_time) & 0x3f) << 22;
- rfbi_write_reg(RFBI_CYCLE_TIME0, l);
+
+ BUG_ON(!t->converted);
+
+ rfbi_enable_clocks(1);
+ rfbi_write_reg(RFBI_ONOFF_TIME0, t->tim[0]);
+ rfbi_write_reg(RFBI_CYCLE_TIME0, t->tim[1]);
+
+ l = rfbi_read_reg(RFBI_CONFIG0);
+ l &= ~(1 << 4);
+ l |= (t->tim[2] ? 1 : 0) << 4;
+ rfbi_write_reg(RFBI_CONFIG0, l);
+
+ rfbi_print_timings();
+ rfbi_enable_clocks(0);
}
-static void rfbi_write_command(u32 cmd)
+static void rfbi_get_clk_info(u32 *clk_period, u32 *max_clk_div)
{
- rfbi_write_reg(RFBI_CMD, cmd);
+ *clk_period = 1000000000 / rfbi.l4_khz;
+ *max_clk_div = 2;
}
-static u32 rfbi_read_data(void)
+static int ps_to_rfbi_ticks(int time, int div)
{
- u32 val;
+ unsigned long tick_ps;
+ int ret;
+
+ /* Calculate in picosecs to yield more exact results */
+ tick_ps = 1000000000 / (rfbi.l4_khz) * div;
+
+ ret = (time + tick_ps - 1) / tick_ps;
- rfbi_write_reg(RFBI_READ, 0);
- val = rfbi_read_reg(RFBI_READ);
- return val;
+ return ret;
+}
+
+#ifdef OMAP_RFBI_RATE_LIMIT
+static unsigned long rfbi_get_max_tx_rate(void)
+{
+ unsigned long l4_rate, dss1_rate;
+ int min_l4_ticks = 0;
+ int i;
+
+ /* According to TI this can't be calculated so make the
+ * adjustments for a couple of known frequencies and warn for
+ * others.
+ */
+ static const struct {
+ unsigned long l4_clk; /* HZ */
+ unsigned long dss1_clk; /* HZ */
+ unsigned long min_l4_ticks;
+ } ftab[] = {
+ { 55, 132, 7, }, /* 7.86 MPix/s */
+ { 110, 110, 12, }, /* 9.16 MPix/s */
+ { 110, 132, 10, }, /* 11 Mpix/s */
+ { 120, 120, 10, }, /* 12 Mpix/s */
+ { 133, 133, 10, }, /* 13.3 Mpix/s */
+ };
+
+ l4_rate = rfbi.l4_khz / 1000;
+ dss1_rate = clk_get_rate(rfbi.dss1_fck) / 1000000;
+
+ for (i = 0; i < ARRAY_SIZE(ftab); i++) {
+ /* Use a window instead of an exact match, to account
+ * for different DPLL multiplier / divider pairs.
+ */
+ if (abs(ftab[i].l4_clk - l4_rate) < 3 &&
+ abs(ftab[i].dss1_clk - dss1_rate) < 3) {
+ min_l4_ticks = ftab[i].min_l4_ticks;
+ break;
+ }
+ }
+ if (i == ARRAY_SIZE(ftab)) {
+ /* Can't be sure, return anyway the maximum not
+ * rate-limited. This might cause a problem only for the
+ * tearing synchronisation.
+ */
+ dev_err(rfbi.fbdev->dev,
+ "can't determine maximum RFBI transfer rate\n");
+ return rfbi.l4_khz * 1000;
+ }
+ return rfbi.l4_khz * 1000 / min_l4_ticks;
}
+#else
+static int rfbi_get_max_tx_rate(void)
+{
+ return rfbi.l4_khz * 1000;
+}
+#endif
-static void rfbi_write_data(u32 val)
+
+static int rfbi_convert_timings(struct extif_timings *t)
{
- rfbi_write_reg(RFBI_PARAM, val);
+ u32 l;
+ int reon, reoff, weon, weoff, cson, csoff, cs_pulse;
+ int actim, recyc, wecyc;
+ int div = t->clk_div;
+
+ if (div <= 0 || div > 2)
+ return -1;
+
+ /* Make sure that after conversion it still holds that:
+ * weoff > weon, reoff > reon, recyc >= reoff, wecyc >= weoff,
+ * csoff > cson, csoff >= max(weoff, reoff), actim > reon
+ */
+ weon = ps_to_rfbi_ticks(t->we_on_time, div);
+ weoff = ps_to_rfbi_ticks(t->we_off_time, div);
+ if (weoff <= weon)
+ weoff = weon + 1;
+ if (weon > 0x0f)
+ return -1;
+ if (weoff > 0x3f)
+ return -1;
+
+ reon = ps_to_rfbi_ticks(t->re_on_time, div);
+ reoff = ps_to_rfbi_ticks(t->re_off_time, div);
+ if (reoff <= reon)
+ reoff = reon + 1;
+ if (reon > 0x0f)
+ return -1;
+ if (reoff > 0x3f)
+ return -1;
+
+ cson = ps_to_rfbi_ticks(t->cs_on_time, div);
+ csoff = ps_to_rfbi_ticks(t->cs_off_time, div);
+ if (csoff <= cson)
+ csoff = cson + 1;
+ if (csoff < max(weoff, reoff))
+ csoff = max(weoff, reoff);
+ if (cson > 0x0f)
+ return -1;
+ if (csoff > 0x3f)
+ return -1;
+
+ l = cson;
+ l |= csoff << 4;
+ l |= weon << 10;
+ l |= weoff << 14;
+ l |= reon << 20;
+ l |= reoff << 24;
+
+ t->tim[0] = l;
+
+ actim = ps_to_rfbi_ticks(t->access_time, div);
+ if (actim <= reon)
+ actim = reon + 1;
+ if (actim > 0x3f)
+ return -1;
+
+ wecyc = ps_to_rfbi_ticks(t->we_cycle_time, div);
+ if (wecyc < weoff)
+ wecyc = weoff;
+ if (wecyc > 0x3f)
+ return -1;
+
+ recyc = ps_to_rfbi_ticks(t->re_cycle_time, div);
+ if (recyc < reoff)
+ recyc = reoff;
+ if (recyc > 0x3f)
+ return -1;
+
+ cs_pulse = ps_to_rfbi_ticks(t->cs_pulse_width, div);
+ if (cs_pulse > 0x3f)
+ return -1;
+
+ l = wecyc;
+ l |= recyc << 6;
+ l |= cs_pulse << 12;
+ l |= actim << 22;
+
+ t->tim[1] = l;
+
+ t->tim[2] = div - 1;
+
+ t->converted = 1;
+
+ return 0;
+}
+
+static int rfbi_setup_tearsync(unsigned pin_cnt,
+ unsigned hs_pulse_time, unsigned vs_pulse_time,
+ int hs_pol_inv, int vs_pol_inv, int extif_div)
+{
+ int hs, vs;
+ int min;
+ u32 l;
+
+ if (pin_cnt != 1 && pin_cnt != 2)
+ return -EINVAL;
+
+ hs = ps_to_rfbi_ticks(hs_pulse_time, 1);
+ vs = ps_to_rfbi_ticks(vs_pulse_time, 1);
+ if (hs < 2)
+ return -EDOM;
+ if (pin_cnt == 2)
+ min = 2;
+ else
+ min = 4;
+ if (vs < min)
+ return -EDOM;
+ if (vs == hs)
+ return -EINVAL;
+ rfbi.tearsync_pin_cnt = pin_cnt;
+ dev_dbg(rfbi.fbdev->dev,
+ "setup_tearsync: pins %d hs %d vs %d hs_inv %d vs_inv %d\n",
+ pin_cnt, hs, vs, hs_pol_inv, vs_pol_inv);
+
+ rfbi_enable_clocks(1);
+ rfbi_write_reg(RFBI_HSYNC_WIDTH, hs);
+ rfbi_write_reg(RFBI_VSYNC_WIDTH, vs);
+
+ l = rfbi_read_reg(RFBI_CONFIG0);
+ if (hs_pol_inv)
+ l &= ~(1 << 21);
+ else
+ l |= 1 << 21;
+ if (vs_pol_inv)
+ l &= ~(1 << 20);
+ else
+ l |= 1 << 20;
+ rfbi_enable_clocks(0);
+
+ return 0;
+}
+
+static int rfbi_enable_tearsync(int enable, unsigned line)
+{
+ u32 l;
+
+ dev_dbg(rfbi.fbdev->dev, "tearsync %d line %d mode %d\n",
+ enable, line, rfbi.tearsync_mode);
+ if (line > (1 << 11) - 1)
+ return -EINVAL;
+
+ rfbi_enable_clocks(1);
+ l = rfbi_read_reg(RFBI_CONFIG0);
+ l &= ~(0x3 << 2);
+ if (enable) {
+ rfbi.tearsync_mode = rfbi.tearsync_pin_cnt;
+ l |= rfbi.tearsync_mode << 2;
+ } else
+ rfbi.tearsync_mode = 0;
+ rfbi_write_reg(RFBI_CONFIG0, l);
+ rfbi_write_reg(RFBI_LINE_NUMBER, line);
+ rfbi_enable_clocks(0);
+
+ return 0;
+}
+
+static void rfbi_write_command(const void *buf, unsigned int len)
+{
+ rfbi_enable_clocks(1);
+ if (rfbi.bits_per_cycle == 16) {
+ const u16 *w = buf;
+ BUG_ON(len & 1);
+ for (; len; len -= 2)
+ rfbi_write_reg(RFBI_CMD, *w++);
+ } else {
+ const u8 *b = buf;
+ BUG_ON(rfbi.bits_per_cycle != 8);
+ for (; len; len--)
+ rfbi_write_reg(RFBI_CMD, *b++);
+ }
+ rfbi_enable_clocks(0);
+}
+
+static void rfbi_read_data(void *buf, unsigned int len)
+{
+ rfbi_enable_clocks(1);
+ if (rfbi.bits_per_cycle == 16) {
+ u16 *w = buf;
+ BUG_ON(len & ~1);
+ for (; len; len -= 2) {
+ rfbi_write_reg(RFBI_READ, 0);
+ *w++ = rfbi_read_reg(RFBI_READ);
+ }
+ } else {
+ u8 *b = buf;
+ BUG_ON(rfbi.bits_per_cycle != 8);
+ for (; len; len--) {
+ rfbi_write_reg(RFBI_READ, 0);
+ *b++ = rfbi_read_reg(RFBI_READ);
+ }
+ }
+ rfbi_enable_clocks(0);
+}
+
+static void rfbi_write_data(const void *buf, unsigned int len)
+{
+ rfbi_enable_clocks(1);
+ if (rfbi.bits_per_cycle == 16) {
+ const u16 *w = buf;
+ BUG_ON(len & 1);
+ for (; len; len -= 2)
+ rfbi_write_reg(RFBI_PARAM, *w++);
+ } else {
+ const u8 *b = buf;
+ BUG_ON(rfbi.bits_per_cycle != 8);
+ for (; len; len--)
+ rfbi_write_reg(RFBI_PARAM, *b++);
+ }
+ rfbi_enable_clocks(0);
}
static void rfbi_transfer_area(int width, int height,
BUG_ON(callback == NULL);
+ rfbi_enable_clocks(1);
omap_dispc_set_lcd_size(width, height);
rfbi.lcdc_callback = callback;
rfbi_write_reg(RFBI_PIXEL_CNT, width * height);
w = rfbi_read_reg(RFBI_CONTROL);
- /* Enable, Internal trigger */
- rfbi_write_reg(RFBI_CONTROL, w | (1 << 0) | (1 << 4));
+ w |= 1; /* enable */
+ if (!rfbi.tearsync_mode)
+ w |= 1 << 4; /* internal trigger, reset by HW */
+ rfbi_write_reg(RFBI_CONTROL, w);
omap_dispc_enable_lcd_out(1);
}
w = rfbi_read_reg(RFBI_CONTROL);
rfbi_write_reg(RFBI_CONTROL, w & ~(1 << 0));
+ rfbi_enable_clocks(0);
}
static void rfbi_dma_callback(void *data)
rfbi.lcdc_callback(rfbi.lcdc_callback_data);
}
-static int rfbi_init(void)
+static void rfbi_set_bits_per_cycle(int bpc)
+{
+ u32 l;
+
+ rfbi_enable_clocks(1);
+ l = rfbi_read_reg(RFBI_CONFIG0);
+ l &= ~(0x03 << 0);
+ switch (bpc)
+ {
+ case 8:
+ break;
+ case 16:
+ l |= 3;
+ break;
+ default:
+ BUG();
+ }
+ rfbi_write_reg(RFBI_CONFIG0, l);
+ rfbi.bits_per_cycle = bpc;
+ rfbi_enable_clocks(0);
+}
+
+static int rfbi_init(struct omapfb_device *fbdev)
{
u32 l;
int r;
- struct clk *dss_ick;
- memset(&rfbi, 0, sizeof(rfbi));
+ rfbi.fbdev = fbdev;
rfbi.base = io_p2v(RFBI_BASE);
- l = rfbi_read_reg(RFBI_REVISION);
- pr_info(MODULE_NAME ": version %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
+ if ((r = rfbi_get_clocks()) < 0)
+ return r;
+ rfbi_enable_clocks(1);
- dss_ick = clk_get(NULL, "dss_ick");
- if (IS_ERR(dss_ick)) {
- pr_err("can't get dss_ick\n");
- return PTR_ERR(dss_ick);
- }
- rfbi.l4_khz = clk_get_rate(dss_ick) / 1000;
- clk_put(dss_ick);
+ rfbi.l4_khz = clk_get_rate(rfbi.dss_ick) / 1000;
/* Reset */
rfbi_write_reg(RFBI_SYSCONFIG, 1 << 1);
l |= (0 << 9) | (1 << 20) | (1 << 21);
rfbi_write_reg(RFBI_CONFIG0, l);
- l = 0x10;
- rfbi_write_reg(RFBI_DATA_CYCLE1_0, l);
- rfbi_write_reg(RFBI_DATA_CYCLE2_0, l);
- rfbi_write_reg(RFBI_DATA_CYCLE3_0, l);
+ rfbi_write_reg(RFBI_DATA_CYCLE1_0, 0x00000010);
l = rfbi_read_reg(RFBI_CONTROL);
- /* Select CS0 */
+ /* Select CS0, clear bypass mode */
l = (0x01 << 2);
rfbi_write_reg(RFBI_CONTROL, l);
if ((r = omap_dispc_request_irq(rfbi_dma_callback, NULL)) < 0) {
- pr_err("can't get DISPC irq\n");
+ dev_err(fbdev->dev, "can't get DISPC irq\n");
+ rfbi_enable_clocks(0);
return r;
}
+ l = rfbi_read_reg(RFBI_REVISION);
+ pr_info("omapfb: RFBI version %d.%d initialized\n",
+ (l >> 4) & 0x0f, l & 0x0f);
+
+ rfbi_enable_clocks(0);
+
return 0;
}
static void rfbi_cleanup(void)
{
omap_dispc_free_irq();
+ rfbi_put_clocks();
}
-struct lcd_ctrl_extif rfbi_extif = {
+const struct lcd_ctrl_extif omap2_ext_if = {
.init = rfbi_init,
.cleanup = rfbi_cleanup,
+ .get_clk_info = rfbi_get_clk_info,
+ .get_max_tx_rate = rfbi_get_max_tx_rate,
+ .set_bits_per_cycle = rfbi_set_bits_per_cycle,
+ .convert_timings = rfbi_convert_timings,
.set_timings = rfbi_set_timings,
.write_command = rfbi_write_command,
.read_data = rfbi_read_data,
.write_data = rfbi_write_data,
.transfer_area = rfbi_transfer_area,
+ .setup_tearsync = rfbi_setup_tearsync,
+ .enable_tearsync = rfbi_enable_tearsync,
+
+ .max_transmit_size = (u32)~0,
};
projects / linux-2.6-omap-h63xx.git / blobdiff