drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/irqdomain.h>
  19 #include <linux/irq.h>
  20
  21 #include "msm_drv.h"
  22 #include "mdp5_kms.h"
  23
  24 void mdp5_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask,
  25                 uint32_t old_irqmask)
  26 {
  27         mdp5_write(to_mdp5_kms(mdp_kms), REG_MDP5_MDP_INTR_CLEAR(0),
  28                 irqmask ^ (irqmask & old_irqmask));
  29         mdp5_write(to_mdp5_kms(mdp_kms), REG_MDP5_MDP_INTR_EN(0), irqmask);
  30 }
  31
  32 static void mdp5_irq_error_handler(struct mdp_irq *irq, uint32_t irqstatus)
  33 {
  34         DRM_ERROR("errors: %08x\n", irqstatus);
  35 }
  36
  37 void mdp5_irq_preinstall(struct msm_kms *kms)
  38 {
  39         struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
  40         mdp5_enable(mdp5_kms);
  41         mdp5_write(mdp5_kms, REG_MDP5_MDP_INTR_CLEAR(0), 0xffffffff);
  42         mdp5_write(mdp5_kms, REG_MDP5_MDP_INTR_EN(0), 0x00000000);
  43         mdp5_disable(mdp5_kms);
  44 }
  45
  46 int mdp5_irq_postinstall(struct msm_kms *kms)
  47 {
  48         struct mdp_kms *mdp_kms = to_mdp_kms(kms);
  49         struct mdp5_kms *mdp5_kms = to_mdp5_kms(mdp_kms);
  50         struct mdp_irq *error_handler = &mdp5_kms->error_handler;
  51
  52         error_handler->irq = mdp5_irq_error_handler;
  53         error_handler->irqmask = MDP5_IRQ_INTF0_UNDER_RUN |
  54                         MDP5_IRQ_INTF1_UNDER_RUN |
  55                         MDP5_IRQ_INTF2_UNDER_RUN |
  56                         MDP5_IRQ_INTF3_UNDER_RUN;
  57
  58         mdp_irq_register(mdp_kms, error_handler);
  59
  60         return 0;
  61 }
  62
  63 void mdp5_irq_uninstall(struct msm_kms *kms)
  64 {
  65         struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
  66         mdp5_enable(mdp5_kms);
  67         mdp5_write(mdp5_kms, REG_MDP5_MDP_INTR_EN(0), 0x00000000);
  68         mdp5_disable(mdp5_kms);
  69 }
  70
  71 static void mdp5_irq_mdp(struct mdp_kms *mdp_kms)
  72 {
  73         struct mdp5_kms *mdp5_kms = to_mdp5_kms(mdp_kms);
  74         struct drm_device *dev = mdp5_kms->dev;
  75         struct msm_drm_private *priv = dev->dev_private;
  76         unsigned int id;
  77         uint32_t status, enable;
  78
  79         enable = mdp5_read(mdp5_kms, REG_MDP5_MDP_INTR_EN(0));
  80         status = mdp5_read(mdp5_kms, REG_MDP5_MDP_INTR_STATUS(0)) & enable;
  81         mdp5_write(mdp5_kms, REG_MDP5_MDP_INTR_CLEAR(0), status);
  82
  83         VERB("status=%08x", status);
  84
  85         mdp_dispatch_irqs(mdp_kms, status);
  86
  87         for (id = 0; id < priv->num_crtcs; id++)
  88                 if (status & mdp5_crtc_vblank(priv->crtcs[id]))
  89                         drm_handle_vblank(dev, id);
  90 }
  91
  92 irqreturn_t mdp5_irq(struct msm_kms *kms)
  93 {
  94         struct mdp_kms *mdp_kms = to_mdp_kms(kms);
  95         struct mdp5_kms *mdp5_kms = to_mdp5_kms(mdp_kms);
  96         uint32_t intr;
  97
  98         intr = mdp5_read(mdp5_kms, REG_MDSS_HW_INTR_STATUS);
  99
 100         VERB("intr=%08x", intr);
 101
 102         if (intr & MDSS_HW_INTR_STATUS_INTR_MDP) {
 103                 mdp5_irq_mdp(mdp_kms);
 104                 intr &= ~MDSS_HW_INTR_STATUS_INTR_MDP;
 105         }
 106
 107         while (intr) {
 108                 irq_hw_number_t hwirq = fls(intr) - 1;
 109                 generic_handle_irq(irq_find_mapping(
 110                                 mdp5_kms->irqcontroller.domain, hwirq));
 111                 intr &= ~(1 << hwirq);
 112         }
 113
 114         return IRQ_HANDLED;
 115 }
 116
 117 int mdp5_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
 118 {
 119         struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
 120
 121         mdp5_enable(mdp5_kms);
 122         mdp_update_vblank_mask(to_mdp_kms(kms),
 123                         mdp5_crtc_vblank(crtc), true);
 124         mdp5_disable(mdp5_kms);
 125
 126         return 0;
 127 }
 128
 129 void mdp5_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
 130 {
 131         struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
 132
 133         mdp5_enable(mdp5_kms);
 134         mdp_update_vblank_mask(to_mdp_kms(kms),
 135                         mdp5_crtc_vblank(crtc), false);
 136         mdp5_disable(mdp5_kms);
 137 }
 138
 139 /*
 140  * interrupt-controller implementation, so sub-blocks (hdmi/eDP/dsi/etc)
 141  * can register to get their irq's delivered
 142  */
 143
 144 #define VALID_IRQS  (MDSS_HW_INTR_STATUS_INTR_DSI0 | \
 145                 MDSS_HW_INTR_STATUS_INTR_DSI1 | \
 146                 MDSS_HW_INTR_STATUS_INTR_HDMI | \
 147                 MDSS_HW_INTR_STATUS_INTR_EDP)
 148
 149 static void mdp5_hw_mask_irq(struct irq_data *irqd)
 150 {
 151         struct mdp5_kms *mdp5_kms = irq_data_get_irq_chip_data(irqd);
 152         smp_mb__before_atomic();
 153         clear_bit(irqd->hwirq, &mdp5_kms->irqcontroller.enabled_mask);
 154         smp_mb__after_atomic();
 155 }
 156
 157 static void mdp5_hw_unmask_irq(struct irq_data *irqd)
 158 {
 159         struct mdp5_kms *mdp5_kms = irq_data_get_irq_chip_data(irqd);
 160         smp_mb__before_atomic();
 161         set_bit(irqd->hwirq, &mdp5_kms->irqcontroller.enabled_mask);
 162         smp_mb__after_atomic();
 163 }
 164
 165 static struct irq_chip mdp5_hw_irq_chip = {
 166         .name           = "mdp5",
 167         .irq_mask       = mdp5_hw_mask_irq,
 168         .irq_unmask     = mdp5_hw_unmask_irq,
 169 };
 170
 171 static int mdp5_hw_irqdomain_map(struct irq_domain *d,
 172                 unsigned int irq, irq_hw_number_t hwirq)
 173 {
 174         struct mdp5_kms *mdp5_kms = d->host_data;
 175
 176         if (!(VALID_IRQS & (1 << hwirq)))
 177                 return -EPERM;
 178
 179         irq_set_chip_and_handler(irq, &mdp5_hw_irq_chip, handle_level_irq);
 180         irq_set_chip_data(irq, mdp5_kms);
 181
 182         return 0;
 183 }
 184
 185 static struct irq_domain_ops mdp5_hw_irqdomain_ops = {
 186         .map = mdp5_hw_irqdomain_map,
 187         .xlate = irq_domain_xlate_onecell,
 188 };
 189
 190
 191 int mdp5_irq_domain_init(struct mdp5_kms *mdp5_kms)
 192 {
 193         struct device *dev = mdp5_kms->dev->dev;
 194         struct irq_domain *d;
 195
 196         d = irq_domain_add_linear(dev->of_node, 32,
 197                         &mdp5_hw_irqdomain_ops, mdp5_kms);
 198         if (!d) {
 199                 dev_err(dev, "mdp5 irq domain add failed\n");
 200                 return -ENXIO;
 201         }
 202
 203         mdp5_kms->irqcontroller.enabled_mask = 0;
 204         mdp5_kms->irqcontroller.domain = d;
 205
 206         return 0;
 207 }
 208
 209 void mdp5_irq_domain_fini(struct mdp5_kms *mdp5_kms)
 210 {
 211         if (mdp5_kms->irqcontroller.domain) {
 212                 irq_domain_remove(mdp5_kms->irqcontroller.domain);
 213                 mdp5_kms->irqcontroller.domain = NULL;
 214         }
 215 }