--
--Trilok Soni
From a2135b0ca6ad0234e9f50f18f7c1faae9d699e69 Mon Sep 17 00:00:00 2001
From: Imre Deak <[email protected]>
Date: Tue, 26 Jun 2007 17:47:18 +0530
Subject: [PATCH 06/17] OMAP: Add TI OMAP2 external LCD controller support - RFBI
- Adds support for Texas Instruments OMAP2 processors boards
connected with external LCD controller through "Remote
framebuffer Interface"
Signed-off-by: Trilok Soni <[email protected]>
---
drivers/video/omap/Makefile | 1 +
drivers/video/omap/rfbi.c | 588 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 589 insertions(+), 0 deletions(-)
create mode 100644 drivers/video/omap/rfbi.c
diff --git a/drivers/video/omap/Makefile b/drivers/video/omap/Makefile
index 5289bf9..1e8dd31 100644
--- a/drivers/video/omap/Makefile
+++ b/drivers/video/omap/Makefile
@@ -10,6 +10,7 @@ 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
+objs-$(CONFIG_ARCH_OMAP2)$(CONFIG_FB_OMAP_LCDC_EXTERNAL) += rfbi.o
omapfb-objs := $(objs-yy)
diff --git a/drivers/video/omap/rfbi.c b/drivers/video/omap/rfbi.c
new file mode 100644
index 0000000..2b42698
--- /dev/null
+++ b/drivers/video/omap/rfbi.c
@@ -0,0 +1,588 @@
+/*
+ * OMAP2 Remote Frame Buffer Interface support
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Author: Juha Yrjölä <[email protected]>
+ * Imre Deak <[email protected]>
+ *
+ * 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/delay.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <asm/arch/omapfb.h>
+
+#include "dispc.h"
+
+/* To work around an RFBI transfer rate limitation */
+#define OMAP_RFBI_RATE_LIMIT 1
+
+#define RFBI_BASE 0x48050800
+#define RFBI_REVISION 0x0000
+#define RFBI_SYSCONFIG 0x0010
+#define RFBI_SYSSTATUS 0x0014
+#define RFBI_CONTROL 0x0040
+#define RFBI_PIXEL_CNT 0x0044
+#define RFBI_LINE_NUMBER 0x0048
+#define RFBI_CMD 0x004c
+#define RFBI_PARAM 0x0050
+#define RFBI_DATA 0x0054
+#define RFBI_READ 0x0058
+#define RFBI_STATUS 0x005c
+#define RFBI_CONFIG0 0x0060
+#define RFBI_ONOFF_TIME0 0x0064
+#define RFBI_CYCLE_TIME0 0x0068
+#define RFBI_DATA_CYCLE1_0 0x006c
+#define RFBI_DATA_CYCLE2_0 0x0070
+#define RFBI_DATA_CYCLE3_0 0x0074
+#define RFBI_VSYNC_WIDTH 0x0090
+#define RFBI_HSYNC_WIDTH 0x0094
+
+#define DISPC_BASE 0x48050400
+#define DISPC_CONTROL 0x0040
+
+static struct {
+ u32 base;
+ 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)
+{
+ __raw_writel(val, rfbi.base + idx);
+}
+
+static inline u32 rfbi_read_reg(int idx)
+{
+ return __raw_readl(rfbi.base + idx);
+}
+
+static int rfbi_get_clocks(void)
+{
+ 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);
+ }
+
+ 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);
+ }
+
+ return 0;
+}
+
+static void rfbi_put_clocks(void)
+{
+ clk_put(rfbi.dss1_fck);
+ clk_put(rfbi.dss_ick);
+}
+
+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;
+
+ 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);
+ 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);
+ 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;
+
+ 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_get_clk_info(u32 *clk_period, u32 *max_clk_div)
+{
+ *clk_period = 1000000000 / rfbi.l4_khz;
+ *max_clk_div = 2;
+}
+
+static int ps_to_rfbi_ticks(int time, int div)
+{
+ 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;
+
+ 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 int rfbi_convert_timings(struct extif_timings *t)
+{
+ 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,
+ void (callback)(void * data), void *data)
+{
+ u32 w;
+
+ BUG_ON(callback == NULL);
+
+ rfbi_enable_clocks(1);
+ omap_dispc_set_lcd_size(width, height);
+
+ rfbi.lcdc_callback = callback;
+ rfbi.lcdc_callback_data = data;
+
+ rfbi_write_reg(RFBI_PIXEL_CNT, width * height);
+
+ w = rfbi_read_reg(RFBI_CONTROL);
+ 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);
+}
+
+static inline void _stop_transfer(void)
+{
+ u32 w;
+
+ 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)
+{
+ _stop_transfer();
+ rfbi.lcdc_callback(rfbi.lcdc_callback_data);
+}
+
+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;
+
+ rfbi.fbdev = fbdev;
+ rfbi.base = io_p2v(RFBI_BASE);
+
+ if ((r = rfbi_get_clocks()) < 0)
+ return r;
+ rfbi_enable_clocks(1);
+
+ rfbi.l4_khz = clk_get_rate(rfbi.dss_ick) / 1000;
+
+ /* Reset */
+ rfbi_write_reg(RFBI_SYSCONFIG, 1 << 1);
+ while (!(rfbi_read_reg(RFBI_SYSSTATUS) & (1 << 0)));
+
+ l = rfbi_read_reg(RFBI_SYSCONFIG);
+ /* Enable autoidle and smart-idle */
+ l |= (1 << 0) | (2 << 3);
+ rfbi_write_reg(RFBI_SYSCONFIG, l);
+
+ /* 16-bit interface, ITE trigger mode, 16-bit data */
+ l = (0x03 << 0) | (0x00 << 2) | (0x01 << 5) | (0x02 << 7);
+ l |= (0 << 9) | (1 << 20) | (1 << 21);
+ rfbi_write_reg(RFBI_CONFIG0, l);
+
+ rfbi_write_reg(RFBI_DATA_CYCLE1_0, 0x00000010);
+
+ l = rfbi_read_reg(RFBI_CONTROL);
+ /* 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) {
+ 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();
+}
+
+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,
+};
+
--
1.5.0
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