2014-07-30 20:20:56 +04:00
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/*
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* Copyright (C) STMicroelectronics SA 2014
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* Authors: Benjamin Gaignard <benjamin.gaignard@st.com>
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* Fabien Dessenne <fabien.dessenne@st.com>
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* Vincent Abriou <vincent.abriou@st.com>
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* for STMicroelectronics.
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* License terms: GNU General Public License (GPL), version 2
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*/
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/platform_device.h>
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#include <drm/drmP.h>
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#include "sti_vtg.h"
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#define VTG_TYPE_MASTER 0
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#define VTG_TYPE_SLAVE_BY_EXT0 1
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/* registers offset */
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#define VTG_MODE 0x0000
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#define VTG_CLKLN 0x0008
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#define VTG_HLFLN 0x000C
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#define VTG_DRST_AUTOC 0x0010
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#define VTG_VID_TFO 0x0040
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#define VTG_VID_TFS 0x0044
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#define VTG_VID_BFO 0x0048
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#define VTG_VID_BFS 0x004C
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#define VTG_HOST_ITS 0x0078
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#define VTG_HOST_ITS_BCLR 0x007C
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#define VTG_HOST_ITM_BCLR 0x0088
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#define VTG_HOST_ITM_BSET 0x008C
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#define VTG_H_HD_1 0x00C0
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#define VTG_TOP_V_VD_1 0x00C4
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#define VTG_BOT_V_VD_1 0x00C8
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#define VTG_TOP_V_HD_1 0x00CC
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#define VTG_BOT_V_HD_1 0x00D0
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#define VTG_H_HD_2 0x00E0
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#define VTG_TOP_V_VD_2 0x00E4
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#define VTG_BOT_V_VD_2 0x00E8
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#define VTG_TOP_V_HD_2 0x00EC
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#define VTG_BOT_V_HD_2 0x00F0
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#define VTG_H_HD_3 0x0100
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#define VTG_TOP_V_VD_3 0x0104
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#define VTG_BOT_V_VD_3 0x0108
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#define VTG_TOP_V_HD_3 0x010C
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#define VTG_BOT_V_HD_3 0x0110
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2014-12-05 12:14:11 +03:00
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#define VTG_H_HD_4 0x0120
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#define VTG_TOP_V_VD_4 0x0124
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#define VTG_BOT_V_VD_4 0x0128
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#define VTG_TOP_V_HD_4 0x012c
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#define VTG_BOT_V_HD_4 0x0130
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2014-07-30 20:20:56 +04:00
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#define VTG_IRQ_BOTTOM BIT(0)
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#define VTG_IRQ_TOP BIT(1)
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#define VTG_IRQ_MASK (VTG_IRQ_TOP | VTG_IRQ_BOTTOM)
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2014-12-05 12:14:11 +03:00
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/* Delay introduced by the HDMI in nb of pixel */
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#define HDMI_DELAY (6)
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2014-07-30 20:20:56 +04:00
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/* delay introduced by the Arbitrary Waveform Generator in nb of pixels */
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#define AWG_DELAY_HD (-9)
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#define AWG_DELAY_ED (-8)
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#define AWG_DELAY_SD (-7)
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LIST_HEAD(vtg_lookup);
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/**
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* STI VTG structure
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*
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* @dev: pointer to device driver
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* @data: data associated to the device
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* @irq: VTG irq
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* @type: VTG type (main or aux)
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* @notifier_list: notifier callback
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* @crtc_id: the crtc id for vblank event
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* @slave: slave vtg
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* @link: List node to link the structure in lookup list
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*/
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struct sti_vtg {
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struct device *dev;
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struct device_node *np;
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void __iomem *regs;
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int irq;
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u32 irq_status;
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struct raw_notifier_head notifier_list;
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int crtc_id;
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struct sti_vtg *slave;
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struct list_head link;
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};
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static void vtg_register(struct sti_vtg *vtg)
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{
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list_add_tail(&vtg->link, &vtg_lookup);
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}
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struct sti_vtg *of_vtg_find(struct device_node *np)
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{
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struct sti_vtg *vtg;
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list_for_each_entry(vtg, &vtg_lookup, link) {
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if (vtg->np == np)
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return vtg;
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}
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return NULL;
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}
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EXPORT_SYMBOL(of_vtg_find);
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static void vtg_reset(struct sti_vtg *vtg)
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{
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/* reset slave and then master */
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if (vtg->slave)
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vtg_reset(vtg->slave);
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writel(1, vtg->regs + VTG_DRST_AUTOC);
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}
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static void vtg_set_mode(struct sti_vtg *vtg,
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int type, const struct drm_display_mode *mode)
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{
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u32 tmp;
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if (vtg->slave)
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vtg_set_mode(vtg->slave, VTG_TYPE_SLAVE_BY_EXT0, mode);
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writel(mode->htotal, vtg->regs + VTG_CLKLN);
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writel(mode->vtotal * 2, vtg->regs + VTG_HLFLN);
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tmp = (mode->vtotal - mode->vsync_start + 1) << 16;
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tmp |= mode->htotal - mode->hsync_start;
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writel(tmp, vtg->regs + VTG_VID_TFO);
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writel(tmp, vtg->regs + VTG_VID_BFO);
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tmp = (mode->vdisplay + mode->vtotal - mode->vsync_start + 1) << 16;
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tmp |= mode->hdisplay + mode->htotal - mode->hsync_start;
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writel(tmp, vtg->regs + VTG_VID_TFS);
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writel(tmp, vtg->regs + VTG_VID_BFS);
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2014-12-05 12:14:11 +03:00
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/* prepare VTG set 1 for HDMI */
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tmp = (mode->hsync_end - mode->hsync_start + HDMI_DELAY) << 16;
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tmp |= HDMI_DELAY;
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2014-07-30 20:20:56 +04:00
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writel(tmp, vtg->regs + VTG_H_HD_1);
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tmp = (mode->vsync_end - mode->vsync_start + 1) << 16;
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tmp |= 1;
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writel(tmp, vtg->regs + VTG_TOP_V_VD_1);
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writel(tmp, vtg->regs + VTG_BOT_V_VD_1);
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writel(0, vtg->regs + VTG_TOP_V_HD_1);
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writel(0, vtg->regs + VTG_BOT_V_HD_1);
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/* prepare VTG set 2 for for HD DCS */
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2014-12-05 12:14:11 +03:00
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tmp = (mode->hsync_end - mode->hsync_start) << 16;
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writel(tmp, vtg->regs + VTG_H_HD_2);
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tmp = (mode->vsync_end - mode->vsync_start + 1) << 16;
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tmp |= 1;
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2014-07-30 20:20:56 +04:00
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writel(tmp, vtg->regs + VTG_TOP_V_VD_2);
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writel(tmp, vtg->regs + VTG_BOT_V_VD_2);
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writel(0, vtg->regs + VTG_TOP_V_HD_2);
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writel(0, vtg->regs + VTG_BOT_V_HD_2);
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/* prepare VTG set 3 for HD Analog in HD mode */
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tmp = (mode->hsync_end - mode->hsync_start + AWG_DELAY_HD) << 16;
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tmp |= mode->htotal + AWG_DELAY_HD;
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writel(tmp, vtg->regs + VTG_H_HD_3);
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tmp = (mode->vsync_end - mode->vsync_start) << 16;
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tmp |= mode->vtotal;
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writel(tmp, vtg->regs + VTG_TOP_V_VD_3);
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writel(tmp, vtg->regs + VTG_BOT_V_VD_3);
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tmp = (mode->htotal + AWG_DELAY_HD) << 16;
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tmp |= mode->htotal + AWG_DELAY_HD;
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writel(tmp, vtg->regs + VTG_TOP_V_HD_3);
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writel(tmp, vtg->regs + VTG_BOT_V_HD_3);
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2014-12-05 12:14:11 +03:00
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/* Prepare VTG set 4 for DVO */
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tmp = (mode->hsync_end - mode->hsync_start) << 16;
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writel(tmp, vtg->regs + VTG_H_HD_4);
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tmp = (mode->vsync_end - mode->vsync_start + 1) << 16;
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tmp |= 1;
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writel(tmp, vtg->regs + VTG_TOP_V_VD_4);
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writel(tmp, vtg->regs + VTG_BOT_V_VD_4);
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writel(0, vtg->regs + VTG_TOP_V_HD_4);
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writel(0, vtg->regs + VTG_BOT_V_HD_4);
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2014-07-30 20:20:56 +04:00
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/* mode */
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writel(type, vtg->regs + VTG_MODE);
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}
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static void vtg_enable_irq(struct sti_vtg *vtg)
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{
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/* clear interrupt status and mask */
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writel(0xFFFF, vtg->regs + VTG_HOST_ITS_BCLR);
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writel(0xFFFF, vtg->regs + VTG_HOST_ITM_BCLR);
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writel(VTG_IRQ_MASK, vtg->regs + VTG_HOST_ITM_BSET);
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}
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void sti_vtg_set_config(struct sti_vtg *vtg,
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const struct drm_display_mode *mode)
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{
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/* write configuration */
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vtg_set_mode(vtg, VTG_TYPE_MASTER, mode);
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vtg_reset(vtg);
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/* enable irq for the vtg vblank synchro */
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if (vtg->slave)
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vtg_enable_irq(vtg->slave);
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else
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vtg_enable_irq(vtg);
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}
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EXPORT_SYMBOL(sti_vtg_set_config);
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/**
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* sti_vtg_get_line_number
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*
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* @mode: display mode to be used
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* @y: line
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*
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* Return the line number according to the display mode taking
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* into account the Sync and Back Porch information.
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* Video frame line numbers start at 1, y starts at 0.
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* In interlaced modes the start line is the field line number of the odd
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* field, but y is still defined as a progressive frame.
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*/
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u32 sti_vtg_get_line_number(struct drm_display_mode mode, int y)
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{
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u32 start_line = mode.vtotal - mode.vsync_start + 1;
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if (mode.flags & DRM_MODE_FLAG_INTERLACE)
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start_line *= 2;
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return start_line + y;
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}
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EXPORT_SYMBOL(sti_vtg_get_line_number);
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/**
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* sti_vtg_get_pixel_number
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*
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* @mode: display mode to be used
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* @x: row
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*
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* Return the pixel number according to the display mode taking
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* into account the Sync and Back Porch information.
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* Pixels are counted from 0.
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*/
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u32 sti_vtg_get_pixel_number(struct drm_display_mode mode, int x)
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{
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return mode.htotal - mode.hsync_start + x;
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}
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EXPORT_SYMBOL(sti_vtg_get_pixel_number);
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int sti_vtg_register_client(struct sti_vtg *vtg,
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struct notifier_block *nb, int crtc_id)
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{
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if (vtg->slave)
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return sti_vtg_register_client(vtg->slave, nb, crtc_id);
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vtg->crtc_id = crtc_id;
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return raw_notifier_chain_register(&vtg->notifier_list, nb);
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}
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EXPORT_SYMBOL(sti_vtg_register_client);
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int sti_vtg_unregister_client(struct sti_vtg *vtg, struct notifier_block *nb)
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{
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if (vtg->slave)
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return sti_vtg_unregister_client(vtg->slave, nb);
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return raw_notifier_chain_unregister(&vtg->notifier_list, nb);
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}
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EXPORT_SYMBOL(sti_vtg_unregister_client);
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static irqreturn_t vtg_irq_thread(int irq, void *arg)
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{
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struct sti_vtg *vtg = arg;
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u32 event;
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event = (vtg->irq_status & VTG_IRQ_TOP) ?
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VTG_TOP_FIELD_EVENT : VTG_BOTTOM_FIELD_EVENT;
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raw_notifier_call_chain(&vtg->notifier_list, event, &vtg->crtc_id);
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return IRQ_HANDLED;
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}
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static irqreturn_t vtg_irq(int irq, void *arg)
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{
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struct sti_vtg *vtg = arg;
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vtg->irq_status = readl(vtg->regs + VTG_HOST_ITS);
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writel(vtg->irq_status, vtg->regs + VTG_HOST_ITS_BCLR);
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/* force sync bus write */
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readl(vtg->regs + VTG_HOST_ITS);
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return IRQ_WAKE_THREAD;
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}
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static int vtg_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np;
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struct sti_vtg *vtg;
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struct resource *res;
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char irq_name[32];
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int ret;
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vtg = devm_kzalloc(dev, sizeof(*vtg), GFP_KERNEL);
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if (!vtg)
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return -ENOMEM;
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vtg->dev = dev;
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vtg->np = pdev->dev.of_node;
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/* Get Memory ressources */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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DRM_ERROR("Get memory resource failed\n");
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return -ENOMEM;
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}
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vtg->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
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np = of_parse_phandle(pdev->dev.of_node, "st,slave", 0);
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if (np) {
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vtg->slave = of_vtg_find(np);
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if (!vtg->slave)
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return -EPROBE_DEFER;
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} else {
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vtg->irq = platform_get_irq(pdev, 0);
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if (IS_ERR_VALUE(vtg->irq)) {
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|
|
|
DRM_ERROR("Failed to get VTG interrupt\n");
|
|
|
|
return vtg->irq;
|
|
|
|
}
|
|
|
|
|
|
|
|
snprintf(irq_name, sizeof(irq_name), "vsync-%s",
|
|
|
|
dev_name(vtg->dev));
|
|
|
|
|
|
|
|
RAW_INIT_NOTIFIER_HEAD(&vtg->notifier_list);
|
|
|
|
|
|
|
|
ret = devm_request_threaded_irq(dev, vtg->irq, vtg_irq,
|
|
|
|
vtg_irq_thread, IRQF_ONESHOT, irq_name, vtg);
|
|
|
|
if (IS_ERR_VALUE(ret)) {
|
|
|
|
DRM_ERROR("Failed to register VTG interrupt\n");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
vtg_register(vtg);
|
|
|
|
platform_set_drvdata(pdev, vtg);
|
|
|
|
|
|
|
|
DRM_INFO("%s %s\n", __func__, dev_name(vtg->dev));
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int vtg_remove(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct of_device_id vtg_of_match[] = {
|
|
|
|
{ .compatible = "st,vtg", },
|
|
|
|
{ /* sentinel */ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, vtg_of_match);
|
|
|
|
|
|
|
|
struct platform_driver sti_vtg_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "sti-vtg",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.of_match_table = vtg_of_match,
|
|
|
|
},
|
|
|
|
.probe = vtg_probe,
|
|
|
|
.remove = vtg_remove,
|
|
|
|
};
|
|
|
|
|
|
|
|
module_platform_driver(sti_vtg_driver);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
|
|
|
|
MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
|
|
|
|
MODULE_LICENSE("GPL");
|