OMAP: DSS2: Display Subsystem Driver core
The core files of DSS2. DSS2 commits are split a bit artificially to
make the individual commits smaller, and DSS2 doesn't compile properly
without the rest of the core commits. This shouldn't be a problem, as no
configuration uses DSS2 yet.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
new file mode 100644
index 0000000..9b05ee6
--- /dev/null
+++ b/drivers/video/omap2/dss/dss.c
@@ -0,0 +1,596 @@
+/*
+ * linux/drivers/video/omap2/dss/dss.c
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
+ *
+ * Some code and ideas taken from drivers/video/omap/ driver
+ * by Imre Deak.
+ *
+ * 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.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#define DSS_SUBSYS_NAME "DSS"
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/seq_file.h>
+#include <linux/clk.h>
+
+#include <plat/display.h>
+#include "dss.h"
+
+#define DSS_BASE 0x48050000
+
+#define DSS_SZ_REGS SZ_512
+
+struct dss_reg {
+ u16 idx;
+};
+
+#define DSS_REG(idx) ((const struct dss_reg) { idx })
+
+#define DSS_REVISION DSS_REG(0x0000)
+#define DSS_SYSCONFIG DSS_REG(0x0010)
+#define DSS_SYSSTATUS DSS_REG(0x0014)
+#define DSS_IRQSTATUS DSS_REG(0x0018)
+#define DSS_CONTROL DSS_REG(0x0040)
+#define DSS_SDI_CONTROL DSS_REG(0x0044)
+#define DSS_PLL_CONTROL DSS_REG(0x0048)
+#define DSS_SDI_STATUS DSS_REG(0x005C)
+
+#define REG_GET(idx, start, end) \
+ FLD_GET(dss_read_reg(idx), start, end)
+
+#define REG_FLD_MOD(idx, val, start, end) \
+ dss_write_reg(idx, FLD_MOD(dss_read_reg(idx), val, start, end))
+
+static struct {
+ void __iomem *base;
+
+ struct clk *dpll4_m4_ck;
+
+ unsigned long cache_req_pck;
+ unsigned long cache_prate;
+ struct dss_clock_info cache_dss_cinfo;
+ struct dispc_clock_info cache_dispc_cinfo;
+
+ u32 ctx[DSS_SZ_REGS / sizeof(u32)];
+} dss;
+
+static int _omap_dss_wait_reset(void);
+
+static inline void dss_write_reg(const struct dss_reg idx, u32 val)
+{
+ __raw_writel(val, dss.base + idx.idx);
+}
+
+static inline u32 dss_read_reg(const struct dss_reg idx)
+{
+ return __raw_readl(dss.base + idx.idx);
+}
+
+#define SR(reg) \
+ dss.ctx[(DSS_##reg).idx / sizeof(u32)] = dss_read_reg(DSS_##reg)
+#define RR(reg) \
+ dss_write_reg(DSS_##reg, dss.ctx[(DSS_##reg).idx / sizeof(u32)])
+
+void dss_save_context(void)
+{
+ if (cpu_is_omap24xx())
+ return;
+
+ SR(SYSCONFIG);
+ SR(CONTROL);
+
+#ifdef CONFIG_OMAP2_DSS_SDI
+ SR(SDI_CONTROL);
+ SR(PLL_CONTROL);
+#endif
+}
+
+void dss_restore_context(void)
+{
+ if (_omap_dss_wait_reset())
+ DSSERR("DSS not coming out of reset after sleep\n");
+
+ RR(SYSCONFIG);
+ RR(CONTROL);
+
+#ifdef CONFIG_OMAP2_DSS_SDI
+ RR(SDI_CONTROL);
+ RR(PLL_CONTROL);
+#endif
+}
+
+#undef SR
+#undef RR
+
+void dss_sdi_init(u8 datapairs)
+{
+ u32 l;
+
+ BUG_ON(datapairs > 3 || datapairs < 1);
+
+ l = dss_read_reg(DSS_SDI_CONTROL);
+ l = FLD_MOD(l, 0xf, 19, 15); /* SDI_PDIV */
+ l = FLD_MOD(l, datapairs-1, 3, 2); /* SDI_PRSEL */
+ l = FLD_MOD(l, 2, 1, 0); /* SDI_BWSEL */
+ dss_write_reg(DSS_SDI_CONTROL, l);
+
+ l = dss_read_reg(DSS_PLL_CONTROL);
+ l = FLD_MOD(l, 0x7, 25, 22); /* SDI_PLL_FREQSEL */
+ l = FLD_MOD(l, 0xb, 16, 11); /* SDI_PLL_REGN */
+ l = FLD_MOD(l, 0xb4, 10, 1); /* SDI_PLL_REGM */
+ dss_write_reg(DSS_PLL_CONTROL, l);
+}
+
+int dss_sdi_enable(void)
+{
+ unsigned long timeout;
+
+ dispc_pck_free_enable(1);
+
+ /* Reset SDI PLL */
+ REG_FLD_MOD(DSS_PLL_CONTROL, 1, 18, 18); /* SDI_PLL_SYSRESET */
+ udelay(1); /* wait 2x PCLK */
+
+ /* Lock SDI PLL */
+ REG_FLD_MOD(DSS_PLL_CONTROL, 1, 28, 28); /* SDI_PLL_GOBIT */
+
+ /* Waiting for PLL lock request to complete */
+ timeout = jiffies + msecs_to_jiffies(500);
+ while (dss_read_reg(DSS_SDI_STATUS) & (1 << 6)) {
+ if (time_after_eq(jiffies, timeout)) {
+ DSSERR("PLL lock request timed out\n");
+ goto err1;
+ }
+ }
+
+ /* Clearing PLL_GO bit */
+ REG_FLD_MOD(DSS_PLL_CONTROL, 0, 28, 28);
+
+ /* Waiting for PLL to lock */
+ timeout = jiffies + msecs_to_jiffies(500);
+ while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 5))) {
+ if (time_after_eq(jiffies, timeout)) {
+ DSSERR("PLL lock timed out\n");
+ goto err1;
+ }
+ }
+
+ dispc_lcd_enable_signal(1);
+
+ /* Waiting for SDI reset to complete */
+ timeout = jiffies + msecs_to_jiffies(500);
+ while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 2))) {
+ if (time_after_eq(jiffies, timeout)) {
+ DSSERR("SDI reset timed out\n");
+ goto err2;
+ }
+ }
+
+ return 0;
+
+ err2:
+ dispc_lcd_enable_signal(0);
+ err1:
+ /* Reset SDI PLL */
+ REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
+
+ dispc_pck_free_enable(0);
+
+ return -ETIMEDOUT;
+}
+
+void dss_sdi_disable(void)
+{
+ dispc_lcd_enable_signal(0);
+
+ dispc_pck_free_enable(0);
+
+ /* Reset SDI PLL */
+ REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
+}
+
+void dss_dump_clocks(struct seq_file *s)
+{
+ unsigned long dpll4_ck_rate;
+ unsigned long dpll4_m4_ck_rate;
+
+ dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
+
+ dpll4_ck_rate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
+ dpll4_m4_ck_rate = clk_get_rate(dss.dpll4_m4_ck);
+
+ seq_printf(s, "- DSS -\n");
+
+ seq_printf(s, "dpll4_ck %lu\n", dpll4_ck_rate);
+
+ seq_printf(s, "dss1_alwon_fclk = %lu / %lu * 2 = %lu\n",
+ dpll4_ck_rate,
+ dpll4_ck_rate / dpll4_m4_ck_rate,
+ dss_clk_get_rate(DSS_CLK_FCK1));
+
+ dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
+}
+
+void dss_dump_regs(struct seq_file *s)
+{
+#define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dss_read_reg(r))
+
+ dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
+
+ DUMPREG(DSS_REVISION);
+ DUMPREG(DSS_SYSCONFIG);
+ DUMPREG(DSS_SYSSTATUS);
+ DUMPREG(DSS_IRQSTATUS);
+ DUMPREG(DSS_CONTROL);
+ DUMPREG(DSS_SDI_CONTROL);
+ DUMPREG(DSS_PLL_CONTROL);
+ DUMPREG(DSS_SDI_STATUS);
+
+ dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
+#undef DUMPREG
+}
+
+void dss_select_clk_source(bool dsi, bool dispc)
+{
+ u32 r;
+ r = dss_read_reg(DSS_CONTROL);
+ r = FLD_MOD(r, dsi, 1, 1); /* DSI_CLK_SWITCH */
+ r = FLD_MOD(r, dispc, 0, 0); /* DISPC_CLK_SWITCH */
+ dss_write_reg(DSS_CONTROL, r);
+}
+
+int dss_get_dsi_clk_source(void)
+{
+ return FLD_GET(dss_read_reg(DSS_CONTROL), 1, 1);
+}
+
+int dss_get_dispc_clk_source(void)
+{
+ return FLD_GET(dss_read_reg(DSS_CONTROL), 0, 0);
+}
+
+/* calculate clock rates using dividers in cinfo */
+int dss_calc_clock_rates(struct dss_clock_info *cinfo)
+{
+ unsigned long prate;
+
+ if (cinfo->fck_div > 16 || cinfo->fck_div == 0)
+ return -EINVAL;
+
+ prate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
+
+ cinfo->fck = prate / cinfo->fck_div;
+
+ return 0;
+}
+
+int dss_set_clock_div(struct dss_clock_info *cinfo)
+{
+ unsigned long prate;
+ int r;
+
+ if (cpu_is_omap34xx()) {
+ prate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
+ DSSDBG("dpll4_m4 = %ld\n", prate);
+
+ r = clk_set_rate(dss.dpll4_m4_ck, prate / cinfo->fck_div);
+ if (r)
+ return r;
+ }
+
+ DSSDBG("fck = %ld (%d)\n", cinfo->fck, cinfo->fck_div);
+
+ return 0;
+}
+
+int dss_get_clock_div(struct dss_clock_info *cinfo)
+{
+ cinfo->fck = dss_clk_get_rate(DSS_CLK_FCK1);
+
+ if (cpu_is_omap34xx()) {
+ unsigned long prate;
+ prate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
+ cinfo->fck_div = prate / (cinfo->fck / 2);
+ } else {
+ cinfo->fck_div = 0;
+ }
+
+ return 0;
+}
+
+unsigned long dss_get_dpll4_rate(void)
+{
+ if (cpu_is_omap34xx())
+ return clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
+ else
+ return 0;
+}
+
+int dss_calc_clock_div(bool is_tft, unsigned long req_pck,
+ struct dss_clock_info *dss_cinfo,
+ struct dispc_clock_info *dispc_cinfo)
+{
+ unsigned long prate;
+ struct dss_clock_info best_dss;
+ struct dispc_clock_info best_dispc;
+
+ unsigned long fck;
+
+ u16 fck_div;
+
+ int match = 0;
+ int min_fck_per_pck;
+
+ prate = dss_get_dpll4_rate();
+
+ fck = dss_clk_get_rate(DSS_CLK_FCK1);
+ if (req_pck == dss.cache_req_pck &&
+ ((cpu_is_omap34xx() && prate == dss.cache_prate) ||
+ dss.cache_dss_cinfo.fck == fck)) {
+ DSSDBG("dispc clock info found from cache.\n");
+ *dss_cinfo = dss.cache_dss_cinfo;
+ *dispc_cinfo = dss.cache_dispc_cinfo;
+ return 0;
+ }
+
+ min_fck_per_pck = CONFIG_OMAP2_DSS_MIN_FCK_PER_PCK;
+
+ if (min_fck_per_pck &&
+ req_pck * min_fck_per_pck > DISPC_MAX_FCK) {
+ DSSERR("Requested pixel clock not possible with the current "
+ "OMAP2_DSS_MIN_FCK_PER_PCK setting. Turning "
+ "the constraint off.\n");
+ min_fck_per_pck = 0;
+ }
+
+retry:
+ memset(&best_dss, 0, sizeof(best_dss));
+ memset(&best_dispc, 0, sizeof(best_dispc));
+
+ if (cpu_is_omap24xx()) {
+ struct dispc_clock_info cur_dispc;
+ /* XXX can we change the clock on omap2? */
+ fck = dss_clk_get_rate(DSS_CLK_FCK1);
+ fck_div = 1;
+
+ dispc_find_clk_divs(is_tft, req_pck, fck, &cur_dispc);
+ match = 1;
+
+ best_dss.fck = fck;
+ best_dss.fck_div = fck_div;
+
+ best_dispc = cur_dispc;
+
+ goto found;
+ } else if (cpu_is_omap34xx()) {
+ for (fck_div = 16; fck_div > 0; --fck_div) {
+ struct dispc_clock_info cur_dispc;
+
+ fck = prate / fck_div * 2;
+
+ if (fck > DISPC_MAX_FCK)
+ continue;
+
+ if (min_fck_per_pck &&
+ fck < req_pck * min_fck_per_pck)
+ continue;
+
+ match = 1;
+
+ dispc_find_clk_divs(is_tft, req_pck, fck, &cur_dispc);
+
+ if (abs(cur_dispc.pck - req_pck) <
+ abs(best_dispc.pck - req_pck)) {
+
+ best_dss.fck = fck;
+ best_dss.fck_div = fck_div;
+
+ best_dispc = cur_dispc;
+
+ if (cur_dispc.pck == req_pck)
+ goto found;
+ }
+ }
+ } else {
+ BUG();
+ }
+
+found:
+ if (!match) {
+ if (min_fck_per_pck) {
+ DSSERR("Could not find suitable clock settings.\n"
+ "Turning FCK/PCK constraint off and"
+ "trying again.\n");
+ min_fck_per_pck = 0;
+ goto retry;
+ }
+
+ DSSERR("Could not find suitable clock settings.\n");
+
+ return -EINVAL;
+ }
+
+ if (dss_cinfo)
+ *dss_cinfo = best_dss;
+ if (dispc_cinfo)
+ *dispc_cinfo = best_dispc;
+
+ dss.cache_req_pck = req_pck;
+ dss.cache_prate = prate;
+ dss.cache_dss_cinfo = best_dss;
+ dss.cache_dispc_cinfo = best_dispc;
+
+ return 0;
+}
+
+
+
+static irqreturn_t dss_irq_handler_omap2(int irq, void *arg)
+{
+ dispc_irq_handler();
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t dss_irq_handler_omap3(int irq, void *arg)
+{
+ u32 irqstatus;
+
+ irqstatus = dss_read_reg(DSS_IRQSTATUS);
+
+ if (irqstatus & (1<<0)) /* DISPC_IRQ */
+ dispc_irq_handler();
+#ifdef CONFIG_OMAP2_DSS_DSI
+ if (irqstatus & (1<<1)) /* DSI_IRQ */
+ dsi_irq_handler();
+#endif
+
+ return IRQ_HANDLED;
+}
+
+static int _omap_dss_wait_reset(void)
+{
+ unsigned timeout = 1000;
+
+ while (REG_GET(DSS_SYSSTATUS, 0, 0) == 0) {
+ udelay(1);
+ if (!--timeout) {
+ DSSERR("soft reset failed\n");
+ return -ENODEV;
+ }
+ }
+
+ return 0;
+}
+
+static int _omap_dss_reset(void)
+{
+ /* Soft reset */
+ REG_FLD_MOD(DSS_SYSCONFIG, 1, 1, 1);
+ return _omap_dss_wait_reset();
+}
+
+void dss_set_venc_output(enum omap_dss_venc_type type)
+{
+ int l = 0;
+
+ if (type == OMAP_DSS_VENC_TYPE_COMPOSITE)
+ l = 0;
+ else if (type == OMAP_DSS_VENC_TYPE_SVIDEO)
+ l = 1;
+ else
+ BUG();
+
+ /* venc out selection. 0 = comp, 1 = svideo */
+ REG_FLD_MOD(DSS_CONTROL, l, 6, 6);
+}
+
+void dss_set_dac_pwrdn_bgz(bool enable)
+{
+ REG_FLD_MOD(DSS_CONTROL, enable, 5, 5); /* DAC Power-Down Control */
+}
+
+int dss_init(bool skip_init)
+{
+ int r;
+ u32 rev;
+
+ dss.base = ioremap(DSS_BASE, DSS_SZ_REGS);
+ if (!dss.base) {
+ DSSERR("can't ioremap DSS\n");
+ r = -ENOMEM;
+ goto fail0;
+ }
+
+ if (!skip_init) {
+ /* disable LCD and DIGIT output. This seems to fix the synclost
+ * problem that we get, if the bootloader starts the DSS and
+ * the kernel resets it */
+ omap_writel(omap_readl(0x48050440) & ~0x3, 0x48050440);
+
+ /* We need to wait here a bit, otherwise we sometimes start to
+ * get synclost errors, and after that only power cycle will
+ * restore DSS functionality. I have no idea why this happens.
+ * And we have to wait _before_ resetting the DSS, but after
+ * enabling clocks.
+ */
+ msleep(50);
+
+ _omap_dss_reset();
+ }
+
+ /* autoidle */
+ REG_FLD_MOD(DSS_SYSCONFIG, 1, 0, 0);
+
+ /* Select DPLL */
+ REG_FLD_MOD(DSS_CONTROL, 0, 0, 0);
+
+#ifdef CONFIG_OMAP2_DSS_VENC
+ REG_FLD_MOD(DSS_CONTROL, 1, 4, 4); /* venc dac demen */
+ REG_FLD_MOD(DSS_CONTROL, 1, 3, 3); /* venc clock 4x enable */
+ REG_FLD_MOD(DSS_CONTROL, 0, 2, 2); /* venc clock mode = normal */
+#endif
+
+ r = request_irq(INT_24XX_DSS_IRQ,
+ cpu_is_omap24xx()
+ ? dss_irq_handler_omap2
+ : dss_irq_handler_omap3,
+ 0, "OMAP DSS", NULL);
+
+ if (r < 0) {
+ DSSERR("omap2 dss: request_irq failed\n");
+ goto fail1;
+ }
+
+ if (cpu_is_omap34xx()) {
+ dss.dpll4_m4_ck = clk_get(NULL, "dpll4_m4_ck");
+ if (IS_ERR(dss.dpll4_m4_ck)) {
+ DSSERR("Failed to get dpll4_m4_ck\n");
+ r = PTR_ERR(dss.dpll4_m4_ck);
+ goto fail2;
+ }
+ }
+
+ dss_save_context();
+
+ rev = dss_read_reg(DSS_REVISION);
+ printk(KERN_INFO "OMAP DSS rev %d.%d\n",
+ FLD_GET(rev, 7, 4), FLD_GET(rev, 3, 0));
+
+ return 0;
+
+fail2:
+ free_irq(INT_24XX_DSS_IRQ, NULL);
+fail1:
+ iounmap(dss.base);
+fail0:
+ return r;
+}
+
+void dss_exit(void)
+{
+ if (cpu_is_omap34xx())
+ clk_put(dss.dpll4_m4_ck);
+
+ free_irq(INT_24XX_DSS_IRQ, NULL);
+
+ iounmap(dss.base);
+}
+