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/*
* SPDX-License-Identifier: GPL-2.0
* Copyright (c) 2018, The Linux Foundation
*/
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdesc.h>
#include <linux/irqchip/chained_irq.h>
#include "dpu_kms.h"
#include <linux/interconnect.h>
#define to_dpu_mdss(x) container_of(x, struct dpu_mdss, base)
#define HW_INTR_STATUS 0x0010
/* Max BW defined in KBps */
#define MAX_BW 6800000
struct dpu_irq_controller {
unsigned long enabled_mask;
struct irq_domain *domain;
};
struct dpu_mdss {
struct msm_mdss base;
void __iomem *mmio;
unsigned long mmio_len;
u32 hwversion;
struct dss_module_power mp;
struct dpu_irq_controller irq_controller;
struct icc_path *path[2];
u32 num_paths;
};
static int dpu_mdss_parse_data_bus_icc_path(struct drm_device *dev,
struct dpu_mdss *dpu_mdss)
{
struct icc_path *path0 = of_icc_get(dev->dev, "mdp0-mem");
struct icc_path *path1 = of_icc_get(dev->dev, "mdp1-mem");
if (IS_ERR_OR_NULL(path0))
return PTR_ERR_OR_ZERO(path0);
dpu_mdss->path[0] = path0;
dpu_mdss->num_paths = 1;
if (!IS_ERR_OR_NULL(path1)) {
dpu_mdss->path[1] = path1;
dpu_mdss->num_paths++;
}
return 0;
}
static void dpu_mdss_icc_request_bw(struct msm_mdss *mdss)
{
struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
int i;
u64 avg_bw = dpu_mdss->num_paths ? MAX_BW / dpu_mdss->num_paths : 0;
for (i = 0; i < dpu_mdss->num_paths; i++)
icc_set_bw(dpu_mdss->path[i], avg_bw, kBps_to_icc(MAX_BW));
}
static void dpu_mdss_irq(struct irq_desc *desc)
{
struct dpu_mdss *dpu_mdss = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
u32 interrupts;
chained_irq_enter(chip, desc);
interrupts = readl_relaxed(dpu_mdss->mmio + HW_INTR_STATUS);
while (interrupts) {
irq_hw_number_t hwirq = fls(interrupts) - 1;
unsigned int mapping;
int rc;
mapping = irq_find_mapping(dpu_mdss->irq_controller.domain,
hwirq);
if (mapping == 0) {
DRM_ERROR("couldn't find irq mapping for %lu\n", hwirq);
break;
}
rc = generic_handle_irq(mapping);
if (rc < 0) {
DRM_ERROR("handle irq fail: irq=%lu mapping=%u rc=%d\n",
hwirq, mapping, rc);
break;
}
interrupts &= ~(1 << hwirq);
}
chained_irq_exit(chip, desc);
}
static void dpu_mdss_irq_mask(struct irq_data *irqd)
{
struct dpu_mdss *dpu_mdss = irq_data_get_irq_chip_data(irqd);
/* memory barrier */
smp_mb__before_atomic();
clear_bit(irqd->hwirq, &dpu_mdss->irq_controller.enabled_mask);
/* memory barrier */
smp_mb__after_atomic();
}
static void dpu_mdss_irq_unmask(struct irq_data *irqd)
{
struct dpu_mdss *dpu_mdss = irq_data_get_irq_chip_data(irqd);
/* memory barrier */
smp_mb__before_atomic();
set_bit(irqd->hwirq, &dpu_mdss->irq_controller.enabled_mask);
/* memory barrier */
smp_mb__after_atomic();
}
static struct irq_chip dpu_mdss_irq_chip = {
.name = "dpu_mdss",
.irq_mask = dpu_mdss_irq_mask,
.irq_unmask = dpu_mdss_irq_unmask,
};
static struct lock_class_key dpu_mdss_lock_key, dpu_mdss_request_key;
static int dpu_mdss_irqdomain_map(struct irq_domain *domain,
unsigned int irq, irq_hw_number_t hwirq)
{
struct dpu_mdss *dpu_mdss = domain->host_data;
irq_set_lockdep_class(irq, &dpu_mdss_lock_key, &dpu_mdss_request_key);
irq_set_chip_and_handler(irq, &dpu_mdss_irq_chip, handle_level_irq);
return irq_set_chip_data(irq, dpu_mdss);
}
static const struct irq_domain_ops dpu_mdss_irqdomain_ops = {
.map = dpu_mdss_irqdomain_map,
.xlate = irq_domain_xlate_onecell,
};
static int _dpu_mdss_irq_domain_add(struct dpu_mdss *dpu_mdss)
{
struct device *dev;
struct irq_domain *domain;
dev = dpu_mdss->base.dev->dev;
domain = irq_domain_add_linear(dev->of_node, 32,
&dpu_mdss_irqdomain_ops, dpu_mdss);
if (!domain) {
DPU_ERROR("failed to add irq_domain\n");
return -EINVAL;
}
dpu_mdss->irq_controller.enabled_mask = 0;
dpu_mdss->irq_controller.domain = domain;
return 0;
}
static void _dpu_mdss_irq_domain_fini(struct dpu_mdss *dpu_mdss)
{
if (dpu_mdss->irq_controller.domain) {
irq_domain_remove(dpu_mdss->irq_controller.domain);
dpu_mdss->irq_controller.domain = NULL;
}
}
static int dpu_mdss_enable(struct msm_mdss *mdss)
{
struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
struct dss_module_power *mp = &dpu_mdss->mp;
int ret;
dpu_mdss_icc_request_bw(mdss);
ret = msm_dss_enable_clk(mp->clk_config, mp->num_clk, true);
if (ret)
DPU_ERROR("clock enable failed, ret:%d\n", ret);
return ret;
}
static int dpu_mdss_disable(struct msm_mdss *mdss)
{
struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
struct dss_module_power *mp = &dpu_mdss->mp;
int ret, i;
ret = msm_dss_enable_clk(mp->clk_config, mp->num_clk, false);
if (ret)
DPU_ERROR("clock disable failed, ret:%d\n", ret);
for (i = 0; i < dpu_mdss->num_paths; i++)
icc_set_bw(dpu_mdss->path[i], 0, 0);
return ret;
}
static void dpu_mdss_destroy(struct drm_device *dev)
{
struct platform_device *pdev = to_platform_device(dev->dev);
struct msm_drm_private *priv = dev->dev_private;
struct dpu_mdss *dpu_mdss = to_dpu_mdss(priv->mdss);
struct dss_module_power *mp = &dpu_mdss->mp;
int irq;
int i;
pm_runtime_suspend(dev->dev);
pm_runtime_disable(dev->dev);
_dpu_mdss_irq_domain_fini(dpu_mdss);
irq = platform_get_irq(pdev, 0);
irq_set_chained_handler_and_data(irq, NULL, NULL);
msm_dss_put_clk(mp->clk_config, mp->num_clk);
devm_kfree(&pdev->dev, mp->clk_config);
for (i = 0; i < dpu_mdss->num_paths; i++)
icc_put(dpu_mdss->path[i]);
if (dpu_mdss->mmio)
devm_iounmap(&pdev->dev, dpu_mdss->mmio);
dpu_mdss->mmio = NULL;
priv->mdss = NULL;
}
static const struct msm_mdss_funcs mdss_funcs = {
.enable = dpu_mdss_enable,
.disable = dpu_mdss_disable,
.destroy = dpu_mdss_destroy,
};
int dpu_mdss_init(struct drm_device *dev)
{
struct platform_device *pdev = to_platform_device(dev->dev);
struct msm_drm_private *priv = dev->dev_private;
struct resource *res;
struct dpu_mdss *dpu_mdss;
struct dss_module_power *mp;
int ret = 0;
int irq;
dpu_mdss = devm_kzalloc(dev->dev, sizeof(*dpu_mdss), GFP_KERNEL);
if (!dpu_mdss)
return -ENOMEM;
dpu_mdss->mmio = msm_ioremap(pdev, "mdss", "mdss");
if (IS_ERR(dpu_mdss->mmio))
return PTR_ERR(dpu_mdss->mmio);
DRM_DEBUG("mapped mdss address space @%pK\n", dpu_mdss->mmio);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mdss");
if (!res) {
DRM_ERROR("failed to get memory resource for mdss\n");
return -ENOMEM;
}
dpu_mdss->mmio_len = resource_size(res);
ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
if (ret)
return ret;
mp = &dpu_mdss->mp;
ret = msm_dss_parse_clock(pdev, mp);
if (ret) {
DPU_ERROR("failed to parse clocks, ret=%d\n", ret);
goto clk_parse_err;
}
dpu_mdss->base.dev = dev;
dpu_mdss->base.funcs = &mdss_funcs;
ret = _dpu_mdss_irq_domain_add(dpu_mdss);
if (ret)
goto irq_domain_error;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
goto irq_error;
irq_set_chained_handler_and_data(irq, dpu_mdss_irq,
dpu_mdss);
priv->mdss = &dpu_mdss->base;
pm_runtime_enable(dev->dev);
dpu_mdss_icc_request_bw(priv->mdss);
pm_runtime_get_sync(dev->dev);
dpu_mdss->hwversion = readl_relaxed(dpu_mdss->mmio);
pm_runtime_put_sync(dev->dev);
return ret;
irq_error:
_dpu_mdss_irq_domain_fini(dpu_mdss);
irq_domain_error:
msm_dss_put_clk(mp->clk_config, mp->num_clk);
clk_parse_err:
devm_kfree(&pdev->dev, mp->clk_config);
if (dpu_mdss->mmio)
devm_iounmap(&pdev->dev, dpu_mdss->mmio);
dpu_mdss->mmio = NULL;
return ret;
}
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