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/*
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <robdclark@gmail.com>
*
* 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/>.
*/
#include "msm_gpu.h"
#include "msm_gem.h"
/*
* Power Management:
*/
#ifdef CONFIG_MSM_BUS_SCALING
#include <mach/board.h>
#include <mach/kgsl.h>
static void bs_init(struct msm_gpu *gpu, struct platform_device *pdev)
{
struct drm_device *dev = gpu->dev;
struct kgsl_device_platform_data *pdata = pdev->dev.platform_data;
if (!pdev) {
dev_err(dev->dev, "could not find dtv pdata\n");
return;
}
if (pdata->bus_scale_table) {
gpu->bsc = msm_bus_scale_register_client(pdata->bus_scale_table);
DBG("bus scale client: %08x", gpu->bsc);
}
}
static void bs_fini(struct msm_gpu *gpu)
{
if (gpu->bsc) {
msm_bus_scale_unregister_client(gpu->bsc);
gpu->bsc = 0;
}
}
static void bs_set(struct msm_gpu *gpu, int idx)
{
if (gpu->bsc) {
DBG("set bus scaling: %d", idx);
msm_bus_scale_client_update_request(gpu->bsc, idx);
}
}
#else
static void bs_init(struct msm_gpu *gpu, struct platform_device *pdev) {}
static void bs_fini(struct msm_gpu *gpu) {}
static void bs_set(struct msm_gpu *gpu, int idx) {}
#endif
static int enable_pwrrail(struct msm_gpu *gpu)
{
struct drm_device *dev = gpu->dev;
int ret = 0;
if (gpu->gpu_reg) {
ret = regulator_enable(gpu->gpu_reg);
if (ret) {
dev_err(dev->dev, "failed to enable 'gpu_reg': %d\n", ret);
return ret;
}
}
if (gpu->gpu_cx) {
ret = regulator_enable(gpu->gpu_cx);
if (ret) {
dev_err(dev->dev, "failed to enable 'gpu_cx': %d\n", ret);
return ret;
}
}
return 0;
}
static int disable_pwrrail(struct msm_gpu *gpu)
{
if (gpu->gpu_cx)
regulator_disable(gpu->gpu_cx);
if (gpu->gpu_reg)
regulator_disable(gpu->gpu_reg);
return 0;
}
static int enable_clk(struct msm_gpu *gpu)
{
struct clk *rate_clk = NULL;
int i;
/* NOTE: kgsl_pwrctrl_clk() ignores grp_clks[0].. */
for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--) {
if (gpu->grp_clks[i]) {
clk_prepare(gpu->grp_clks[i]);
rate_clk = gpu->grp_clks[i];
}
}
if (rate_clk && gpu->fast_rate)
clk_set_rate(rate_clk, gpu->fast_rate);
for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--)
if (gpu->grp_clks[i])
clk_enable(gpu->grp_clks[i]);
return 0;
}
static int disable_clk(struct msm_gpu *gpu)
{
struct clk *rate_clk = NULL;
int i;
/* NOTE: kgsl_pwrctrl_clk() ignores grp_clks[0].. */
for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--) {
if (gpu->grp_clks[i]) {
clk_disable(gpu->grp_clks[i]);
rate_clk = gpu->grp_clks[i];
}
}
if (rate_clk && gpu->slow_rate)
clk_set_rate(rate_clk, gpu->slow_rate);
for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--)
if (gpu->grp_clks[i])
clk_unprepare(gpu->grp_clks[i]);
return 0;
}
static int enable_axi(struct msm_gpu *gpu)
{
if (gpu->ebi1_clk)
clk_prepare_enable(gpu->ebi1_clk);
if (gpu->bus_freq)
bs_set(gpu, gpu->bus_freq);
return 0;
}
static int disable_axi(struct msm_gpu *gpu)
{
if (gpu->ebi1_clk)
clk_disable_unprepare(gpu->ebi1_clk);
if (gpu->bus_freq)
bs_set(gpu, 0);
return 0;
}
int msm_gpu_pm_resume(struct msm_gpu *gpu)
{
int ret;
DBG("%s", gpu->name);
ret = enable_pwrrail(gpu);
if (ret)
return ret;
ret = enable_clk(gpu);
if (ret)
return ret;
ret = enable_axi(gpu);
if (ret)
return ret;
return 0;
}
int msm_gpu_pm_suspend(struct msm_gpu *gpu)
{
int ret;
DBG("%s", gpu->name);
ret = disable_axi(gpu);
if (ret)
return ret;
ret = disable_clk(gpu);
if (ret)
return ret;
ret = disable_pwrrail(gpu);
if (ret)
return ret;
return 0;
}
/*
* Cmdstream submission/retirement:
*/
static void retire_worker(struct work_struct *work)
{
struct msm_gpu *gpu = container_of(work, struct msm_gpu, retire_work);
struct drm_device *dev = gpu->dev;
uint32_t fence = gpu->funcs->last_fence(gpu);
mutex_lock(&dev->struct_mutex);
while (!list_empty(&gpu->active_list)) {
struct msm_gem_object *obj;
obj = list_first_entry(&gpu->active_list,
struct msm_gem_object, mm_list);
if (obj->fence <= fence) {
/* move to inactive: */
msm_gem_move_to_inactive(&obj->base);
msm_gem_put_iova(&obj->base, gpu->id);
drm_gem_object_unreference(&obj->base);
} else {
break;
}
}
msm_update_fence(gpu->dev, fence);
mutex_unlock(&dev->struct_mutex);
}
/* call from irq handler to schedule work to retire bo's */
void msm_gpu_retire(struct msm_gpu *gpu)
{
struct msm_drm_private *priv = gpu->dev->dev_private;
queue_work(priv->wq, &gpu->retire_work);
}
/* add bo's to gpu's ring, and kick gpu: */
int msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
struct msm_file_private *ctx)
{
struct drm_device *dev = gpu->dev;
struct msm_drm_private *priv = dev->dev_private;
int i, ret;
mutex_lock(&dev->struct_mutex);
submit->fence = ++priv->next_fence;
ret = gpu->funcs->submit(gpu, submit, ctx);
priv->lastctx = ctx;
for (i = 0; i < submit->nr_bos; i++) {
struct msm_gem_object *msm_obj = submit->bos[i].obj;
/* can't happen yet.. but when we add 2d support we'll have
* to deal w/ cross-ring synchronization:
*/
WARN_ON(is_active(msm_obj) && (msm_obj->gpu != gpu));
if (!is_active(msm_obj)) {
uint32_t iova;
/* ring takes a reference to the bo and iova: */
drm_gem_object_reference(&msm_obj->base);
msm_gem_get_iova_locked(&msm_obj->base,
submit->gpu->id, &iova);
}
msm_gem_move_to_active(&msm_obj->base, gpu, submit->fence);
}
mutex_unlock(&dev->struct_mutex);
return ret;
}
/*
* Init/Cleanup:
*/
static irqreturn_t irq_handler(int irq, void *data)
{
struct msm_gpu *gpu = data;
return gpu->funcs->irq(gpu);
}
static const char *clk_names[] = {
"src_clk", "core_clk", "iface_clk", "mem_clk", "mem_iface_clk",
};
int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
struct msm_gpu *gpu, const struct msm_gpu_funcs *funcs,
const char *name, const char *ioname, const char *irqname, int ringsz)
{
int i, ret;
gpu->dev = drm;
gpu->funcs = funcs;
gpu->name = name;
INIT_LIST_HEAD(&gpu->active_list);
INIT_WORK(&gpu->retire_work, retire_worker);
BUG_ON(ARRAY_SIZE(clk_names) != ARRAY_SIZE(gpu->grp_clks));
/* Map registers: */
gpu->mmio = msm_ioremap(pdev, ioname, name);
if (IS_ERR(gpu->mmio)) {
ret = PTR_ERR(gpu->mmio);
goto fail;
}
/* Get Interrupt: */
gpu->irq = platform_get_irq_byname(pdev, irqname);
if (gpu->irq < 0) {
ret = gpu->irq;
dev_err(drm->dev, "failed to get irq: %d\n", ret);
goto fail;
}
ret = devm_request_irq(&pdev->dev, gpu->irq, irq_handler,
IRQF_TRIGGER_HIGH, gpu->name, gpu);
if (ret) {
dev_err(drm->dev, "failed to request IRQ%u: %d\n", gpu->irq, ret);
goto fail;
}
/* Acquire clocks: */
for (i = 0; i < ARRAY_SIZE(clk_names); i++) {
gpu->grp_clks[i] = devm_clk_get(&pdev->dev, clk_names[i]);
DBG("grp_clks[%s]: %p", clk_names[i], gpu->grp_clks[i]);
if (IS_ERR(gpu->grp_clks[i]))
gpu->grp_clks[i] = NULL;
}
gpu->ebi1_clk = devm_clk_get(&pdev->dev, "bus_clk");
DBG("ebi1_clk: %p", gpu->ebi1_clk);
if (IS_ERR(gpu->ebi1_clk))
gpu->ebi1_clk = NULL;
/* Acquire regulators: */
gpu->gpu_reg = devm_regulator_get(&pdev->dev, "vdd");
DBG("gpu_reg: %p", gpu->gpu_reg);
if (IS_ERR(gpu->gpu_reg))
gpu->gpu_reg = NULL;
gpu->gpu_cx = devm_regulator_get(&pdev->dev, "vddcx");
DBG("gpu_cx: %p", gpu->gpu_cx);
if (IS_ERR(gpu->gpu_cx))
gpu->gpu_cx = NULL;
/* Setup IOMMU.. eventually we will (I think) do this once per context
* and have separate page tables per context. For now, to keep things
* simple and to get something working, just use a single address space:
*/
gpu->iommu = iommu_domain_alloc(&platform_bus_type);
if (!gpu->iommu) {
dev_err(drm->dev, "failed to allocate IOMMU\n");
ret = -ENOMEM;
goto fail;
}
gpu->id = msm_register_iommu(drm, gpu->iommu);
/* Create ringbuffer: */
gpu->rb = msm_ringbuffer_new(gpu, ringsz);
if (IS_ERR(gpu->rb)) {
ret = PTR_ERR(gpu->rb);
gpu->rb = NULL;
dev_err(drm->dev, "could not create ringbuffer: %d\n", ret);
goto fail;
}
ret = msm_gem_get_iova_locked(gpu->rb->bo, gpu->id, &gpu->rb_iova);
if (ret) {
gpu->rb_iova = 0;
dev_err(drm->dev, "could not map ringbuffer: %d\n", ret);
goto fail;
}
bs_init(gpu, pdev);
return 0;
fail:
return ret;
}
void msm_gpu_cleanup(struct msm_gpu *gpu)
{
DBG("%s", gpu->name);
WARN_ON(!list_empty(&gpu->active_list));
bs_fini(gpu);
if (gpu->rb) {
if (gpu->rb_iova)
msm_gem_put_iova(gpu->rb->bo, gpu->id);
msm_ringbuffer_destroy(gpu->rb);
}
if (gpu->iommu)
iommu_domain_free(gpu->iommu);
}
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