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Commit 5e0df3a0 authored by Rongrong Zou's avatar Rongrong Zou
Browse files

drm/hisilicon/hibmc: Add hisilicon hibmc drm master driver 



Add DRM master driver for Hisilicon Hibmc SoC which used for
Out-of-band management. Blow is the general hardware connection,
both the Hibmc and the host CPU are on the same mother board.

+----------+       +----------+
|          | PCIe  |  Hibmc   |
|host CPU( |<----->| display  |
|arm64,x86)|       |subsystem |
+----------+       +----------+

Signed-off-by: default avatarRongrong Zou <zourongrong@gmail.com>
Reviewed-by: default avatarSean Paul <seanpaul@chromium.org>
Reviewed-by: default avatarXinliang Liu <xinliang.liu@linaro.org>
Acked-by: default avatarSean Paul <seanpaul@chromium.org>
parent b7c0e47d

drivers/gpu/drm/hisilicon/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -2,4 +2,5 @@ 
# hisilicon drm device configuration.

# Please keep this list sorted alphabetically



source "drivers/gpu/drm/hisilicon/hibmc/Kconfig"

source "drivers/gpu/drm/hisilicon/kirin/Kconfig"

drivers/gpu/drm/hisilicon/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -2,4 +2,5 @@ 
# Makefile for hisilicon drm drivers.

# Please keep this list sorted alphabetically



obj-$(CONFIG_DRM_HISI_HIBMC) += hibmc/

obj-$(CONFIG_DRM_HISI_KIRIN) += kirin/

drivers/gpu/drm/hisilicon/hibmc/Kconfig

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+9 −0
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config DRM_HISI_HIBMC

	tristate "DRM Support for Hisilicon Hibmc"

	depends on DRM && PCI

	select DRM_KMS_HELPER

	select DRM_TTM



	help

	  Choose this option if you have a Hisilicon Hibmc soc chipset.

	  If M is selected the module will be called hibmc-drm.

drivers/gpu/drm/hisilicon/hibmc/Makefile

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+4 −0
Original line number Diff line number Diff line 
ccflags-y := -Iinclude/drm

hibmc-drm-y := hibmc_drm_drv.o



obj-$(CONFIG_DRM_HISI_HIBMC) += hibmc-drm.o

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

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+308 −0
Original line number Diff line number Diff line 
/* Hisilicon Hibmc SoC drm driver

 *

 * Based on the bochs drm driver.

 *

 * Copyright (c) 2016 Huawei Limited.

 *

 * Author:

 *	Rongrong Zou <zourongrong@huawei.com>

 *	Rongrong Zou <zourongrong@gmail.com>

 *	Jianhua Li <lijianhua@huawei.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 */



#include <linux/console.h>

#include <linux/module.h>



#include "hibmc_drm_drv.h"

#include "hibmc_drm_regs.h"



static const struct file_operations hibmc_fops = {

	.owner		= THIS_MODULE,

	.open		= drm_open,

	.release	= drm_release,

	.unlocked_ioctl	= drm_ioctl,

	.compat_ioctl	= drm_compat_ioctl,

	.poll		= drm_poll,

	.read		= drm_read,

	.llseek		= no_llseek,

};



static int hibmc_enable_vblank(struct drm_device *dev, unsigned int pipe)

{

	return 0;

}



static void hibmc_disable_vblank(struct drm_device *dev, unsigned int pipe)

{

}



static struct drm_driver hibmc_driver = {

	.fops			= &hibmc_fops,

	.name			= "hibmc",

	.date			= "20160828",

	.desc			= "hibmc drm driver",

	.major			= 1,

	.minor			= 0,

	.get_vblank_counter	= drm_vblank_no_hw_counter,

	.enable_vblank		= hibmc_enable_vblank,

	.disable_vblank		= hibmc_disable_vblank,

};



static int hibmc_pm_suspend(struct device *dev)

{

	return 0;

}



static int hibmc_pm_resume(struct device *dev)

{

	return 0;

}



static const struct dev_pm_ops hibmc_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(hibmc_pm_suspend,

				hibmc_pm_resume)

};



/*

 * It can operate in one of three modes: 0, 1 or Sleep.

 */

void hibmc_set_power_mode(struct hibmc_drm_private *priv,

			  unsigned int power_mode)

{

	unsigned int control_value = 0;

	void __iomem   *mmio = priv->mmio;

	unsigned int input = 1;



	if (power_mode > HIBMC_PW_MODE_CTL_MODE_SLEEP)

		return;



	if (power_mode == HIBMC_PW_MODE_CTL_MODE_SLEEP)

		input = 0;



	control_value = readl(mmio + HIBMC_POWER_MODE_CTRL);

	control_value &= ~(HIBMC_PW_MODE_CTL_MODE_MASK |

			   HIBMC_PW_MODE_CTL_OSC_INPUT_MASK);

	control_value |= HIBMC_FIELD(HIBMC_PW_MODE_CTL_MODE, power_mode);

	control_value |= HIBMC_FIELD(HIBMC_PW_MODE_CTL_OSC_INPUT, input);

	writel(control_value, mmio + HIBMC_POWER_MODE_CTRL);

}



void hibmc_set_current_gate(struct hibmc_drm_private *priv, unsigned int gate)

{

	unsigned int gate_reg;

	unsigned int mode;

	void __iomem   *mmio = priv->mmio;



	/* Get current power mode. */

	mode = (readl(mmio + HIBMC_POWER_MODE_CTRL) &

		HIBMC_PW_MODE_CTL_MODE_MASK) >> HIBMC_PW_MODE_CTL_MODE_SHIFT;



	switch (mode) {

	case HIBMC_PW_MODE_CTL_MODE_MODE0:

		gate_reg = HIBMC_MODE0_GATE;

		break;



	case HIBMC_PW_MODE_CTL_MODE_MODE1:

		gate_reg = HIBMC_MODE1_GATE;

		break;



	default:

		gate_reg = HIBMC_MODE0_GATE;

		break;

	}

	writel(gate, mmio + gate_reg);

}



static void hibmc_hw_config(struct hibmc_drm_private *priv)

{

	unsigned int reg;



	/* On hardware reset, power mode 0 is default. */

	hibmc_set_power_mode(priv, HIBMC_PW_MODE_CTL_MODE_MODE0);



	/* Enable display power gate & LOCALMEM power gate*/

	reg = readl(priv->mmio + HIBMC_CURRENT_GATE);

	reg &= ~HIBMC_CURR_GATE_DISPLAY_MASK;

	reg &= ~HIBMC_CURR_GATE_LOCALMEM_MASK;

	reg |= HIBMC_CURR_GATE_DISPLAY(1);

	reg |= HIBMC_CURR_GATE_LOCALMEM(1);



	hibmc_set_current_gate(priv, reg);



	/*

	 * Reset the memory controller. If the memory controller

	 * is not reset in chip,the system might hang when sw accesses

	 * the memory.The memory should be resetted after

	 * changing the MXCLK.

	 */

	reg = readl(priv->mmio + HIBMC_MISC_CTRL);

	reg &= ~HIBMC_MSCCTL_LOCALMEM_RESET_MASK;

	reg |= HIBMC_MSCCTL_LOCALMEM_RESET(0);

	writel(reg, priv->mmio + HIBMC_MISC_CTRL);



	reg &= ~HIBMC_MSCCTL_LOCALMEM_RESET_MASK;

	reg |= HIBMC_MSCCTL_LOCALMEM_RESET(1);



	writel(reg, priv->mmio + HIBMC_MISC_CTRL);

}



static int hibmc_hw_map(struct hibmc_drm_private *priv)

{

	struct drm_device *dev = priv->dev;

	struct pci_dev *pdev = dev->pdev;

	resource_size_t addr, size, ioaddr, iosize;



	ioaddr = pci_resource_start(pdev, 1);

	iosize = pci_resource_len(pdev, 1);

	priv->mmio = devm_ioremap_nocache(dev->dev, ioaddr, iosize);

	if (!priv->mmio) {

		DRM_ERROR("Cannot map mmio region\n");

		return -ENOMEM;

	}



	addr = pci_resource_start(pdev, 0);

	size = pci_resource_len(pdev, 0);

	priv->fb_map = devm_ioremap(dev->dev, addr, size);

	if (!priv->fb_map) {

		DRM_ERROR("Cannot map framebuffer\n");

		return -ENOMEM;

	}

	priv->fb_base = addr;

	priv->fb_size = size;



	return 0;

}



static int hibmc_hw_init(struct hibmc_drm_private *priv)

{

	int ret;



	ret = hibmc_hw_map(priv);

	if (ret)

		return ret;



	hibmc_hw_config(priv);



	return 0;

}



static int hibmc_unload(struct drm_device *dev)

{

	return 0;

}



static int hibmc_load(struct drm_device *dev)

{

	struct hibmc_drm_private *priv;

	int ret;



	priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);

	if (!priv) {

		DRM_ERROR("no memory to allocate for hibmc_drm_private\n");

		return -ENOMEM;

	}

	dev->dev_private = priv;

	priv->dev = dev;



	ret = hibmc_hw_init(priv);

	if (ret)

		goto err;



	return 0;



err:

	hibmc_unload(dev);

	DRM_ERROR("failed to initialize drm driver: %d\n", ret);

	return ret;

}



static int hibmc_pci_probe(struct pci_dev *pdev,

			   const struct pci_device_id *ent)

{

	struct drm_device *dev;

	int ret;



	dev = drm_dev_alloc(&hibmc_driver, &pdev->dev);

	if (!dev) {

		DRM_ERROR("failed to allocate drm_device\n");

		return -ENOMEM;

	}



	dev->pdev = pdev;

	pci_set_drvdata(pdev, dev);



	ret = pci_enable_device(pdev);

	if (ret) {

		DRM_ERROR("failed to enable pci device: %d\n", ret);

		goto err_free;

	}



	ret = hibmc_load(dev);

	if (ret) {

		DRM_ERROR("failed to load hibmc: %d\n", ret);

		goto err_disable;

	}



	ret = drm_dev_register(dev, 0);

	if (ret) {

		DRM_ERROR("failed to register drv for userspace access: %d\n",

			  ret);

		goto err_unload;

	}

	return 0;



err_unload:

	hibmc_unload(dev);

err_disable:

	pci_disable_device(pdev);

err_free:

	drm_dev_unref(dev);



	return ret;

}



static void hibmc_pci_remove(struct pci_dev *pdev)

{

	struct drm_device *dev = pci_get_drvdata(pdev);



	drm_dev_unregister(dev);

	hibmc_unload(dev);

	drm_dev_unref(dev);

}



static struct pci_device_id hibmc_pci_table[] = {

	{0x19e5, 0x1711, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},

	{0,}

};



static struct pci_driver hibmc_pci_driver = {

	.name =		"hibmc-drm",

	.id_table =	hibmc_pci_table,

	.probe =	hibmc_pci_probe,

	.remove =	hibmc_pci_remove,

	.driver.pm =    &hibmc_pm_ops,

};



static int __init hibmc_init(void)

{

	return pci_register_driver(&hibmc_pci_driver);

}



static void __exit hibmc_exit(void)

{

	return pci_unregister_driver(&hibmc_pci_driver);

}



module_init(hibmc_init);

module_exit(hibmc_exit);



MODULE_DEVICE_TABLE(pci, hibmc_pci_table);

MODULE_AUTHOR("RongrongZou <zourongrong@huawei.com>");

MODULE_DESCRIPTION("DRM Driver for Hisilicon Hibmc");

MODULE_LICENSE("GPL v2");