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/*
* Copyright (c) 2015-2016 MediaTek Inc.
* Author: Yong Wu <yong.wu@mediatek.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.
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <soc/mediatek/smi.h>
#include <dt-bindings/memory/mt2701-larb-port.h>
#define SMI_LARB_MMU_EN 0xf00
#define REG_SMI_SECUR_CON_BASE 0x5c0
/* every register control 8 port, register offset 0x4 */
#define REG_SMI_SECUR_CON_OFFSET(id) (((id) >> 3) << 2)
#define REG_SMI_SECUR_CON_ADDR(id) \
(REG_SMI_SECUR_CON_BASE + REG_SMI_SECUR_CON_OFFSET(id))
/*
* every port have 4 bit to control, bit[port + 3] control virtual or physical,
* bit[port + 2 : port + 1] control the domain, bit[port] control the security
* or non-security.
*/
#define SMI_SECUR_CON_VAL_MSK(id) (~(0xf << (((id) & 0x7) << 2)))
#define SMI_SECUR_CON_VAL_VIRT(id) BIT((((id) & 0x7) << 2) + 3)
/* mt2701 domain should be set to 3 */
#define SMI_SECUR_CON_VAL_DOMAIN(id) (0x3 << ((((id) & 0x7) << 2) + 1))
struct mtk_smi_larb_gen {
int port_in_larb[MTK_LARB_NR_MAX + 1];
void (*config_port)(struct device *);
};
struct mtk_smi {
struct device *dev;
struct clk *clk_apb, *clk_smi;
struct clk *clk_async; /*only needed by mt2701*/
void __iomem *smi_ao_base;
};
struct mtk_smi_larb { /* larb: local arbiter */
struct mtk_smi smi;
void __iomem *base;
struct device *smi_common_dev;
const struct mtk_smi_larb_gen *larb_gen;
int larbid;
u32 *mmu;
};
enum mtk_smi_gen {
MTK_SMI_GEN1,
MTK_SMI_GEN2
};
static int mtk_smi_enable(const struct mtk_smi *smi)
{
int ret;
ret = pm_runtime_get_sync(smi->dev);
if (ret < 0)
return ret;
ret = clk_prepare_enable(smi->clk_apb);
if (ret)
goto err_put_pm;
ret = clk_prepare_enable(smi->clk_smi);
if (ret)
goto err_disable_apb;
return 0;
err_disable_apb:
clk_disable_unprepare(smi->clk_apb);
err_put_pm:
pm_runtime_put_sync(smi->dev);
return ret;
}
static void mtk_smi_disable(const struct mtk_smi *smi)
{
clk_disable_unprepare(smi->clk_smi);
clk_disable_unprepare(smi->clk_apb);
pm_runtime_put_sync(smi->dev);
}
int mtk_smi_larb_get(struct device *larbdev)
{
struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
int ret;
/* Enable the smi-common's power and clocks */
ret = mtk_smi_enable(common);
if (ret)
return ret;
/* Enable the larb's power and clocks */
ret = mtk_smi_enable(&larb->smi);
if (ret) {
mtk_smi_disable(common);
return ret;
}
/* Configure the iommu info for this larb */
larb_gen->config_port(larbdev);
return 0;
}
EXPORT_SYMBOL_GPL(mtk_smi_larb_get);
void mtk_smi_larb_put(struct device *larbdev)
{
struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
/*
* Don't de-configure the iommu info for this larb since there may be
* several modules in this larb.
* The iommu info will be reset after power off.
*/
mtk_smi_disable(&larb->smi);
mtk_smi_disable(common);
}
EXPORT_SYMBOL_GPL(mtk_smi_larb_put);
static int
mtk_smi_larb_bind(struct device *dev, struct device *master, void *data)
{
struct mtk_smi_larb *larb = dev_get_drvdata(dev);
struct mtk_smi_iommu *smi_iommu = data;
unsigned int i;
for (i = 0; i < smi_iommu->larb_nr; i++) {
if (dev == smi_iommu->larb_imu[i].dev) {
/* The 'mmu' may be updated in iommu-attach/detach. */
larb->mmu = &smi_iommu->larb_imu[i].mmu;
return 0;
}
}
return -ENODEV;
}
static void mtk_smi_larb_config_port(struct device *dev)
{
struct mtk_smi_larb *larb = dev_get_drvdata(dev);
writel(*larb->mmu, larb->base + SMI_LARB_MMU_EN);
}
static void mtk_smi_larb_config_port_gen1(struct device *dev)
{
struct mtk_smi_larb *larb = dev_get_drvdata(dev);
const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
int i, m4u_port_id, larb_port_num;
u32 sec_con_val, reg_val;
m4u_port_id = larb_gen->port_in_larb[larb->larbid];
larb_port_num = larb_gen->port_in_larb[larb->larbid + 1]
- larb_gen->port_in_larb[larb->larbid];
for (i = 0; i < larb_port_num; i++, m4u_port_id++) {
if (*larb->mmu & BIT(i)) {
/* bit[port + 3] controls the virtual or physical */
sec_con_val = SMI_SECUR_CON_VAL_VIRT(m4u_port_id);
} else {
/* do not need to enable m4u for this port */
continue;
}
reg_val = readl(common->smi_ao_base
+ REG_SMI_SECUR_CON_ADDR(m4u_port_id));
reg_val &= SMI_SECUR_CON_VAL_MSK(m4u_port_id);
reg_val |= sec_con_val;
reg_val |= SMI_SECUR_CON_VAL_DOMAIN(m4u_port_id);
writel(reg_val,
common->smi_ao_base
+ REG_SMI_SECUR_CON_ADDR(m4u_port_id));
}
}
static void
mtk_smi_larb_unbind(struct device *dev, struct device *master, void *data)
{
/* Do nothing as the iommu is always enabled. */
}
static const struct component_ops mtk_smi_larb_component_ops = {
.bind = mtk_smi_larb_bind,
.unbind = mtk_smi_larb_unbind,
};
static const struct mtk_smi_larb_gen mtk_smi_larb_mt8173 = {
/* mt8173 do not need the port in larb */
.config_port = mtk_smi_larb_config_port,
};
static const struct mtk_smi_larb_gen mtk_smi_larb_mt2701 = {
.port_in_larb = {
LARB0_PORT_OFFSET, LARB1_PORT_OFFSET,
LARB2_PORT_OFFSET, LARB3_PORT_OFFSET
},
.config_port = mtk_smi_larb_config_port_gen1,
};
static const struct of_device_id mtk_smi_larb_of_ids[] = {
{
.compatible = "mediatek,mt8173-smi-larb",
.data = &mtk_smi_larb_mt8173
},
{
.compatible = "mediatek,mt2701-smi-larb",
.data = &mtk_smi_larb_mt2701
},
{}
};
static int mtk_smi_larb_probe(struct platform_device *pdev)
{
struct mtk_smi_larb *larb;
struct resource *res;
struct device *dev = &pdev->dev;
struct device_node *smi_node;
struct platform_device *smi_pdev;
const struct of_device_id *of_id;
if (!dev->pm_domain)
return -EPROBE_DEFER;
of_id = of_match_node(mtk_smi_larb_of_ids, pdev->dev.of_node);
if (!of_id)
return -EINVAL;
larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
if (!larb)
return -ENOMEM;
larb->larb_gen = of_id->data;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
larb->base = devm_ioremap_resource(dev, res);
if (IS_ERR(larb->base))
return PTR_ERR(larb->base);
larb->smi.clk_apb = devm_clk_get(dev, "apb");
if (IS_ERR(larb->smi.clk_apb))
return PTR_ERR(larb->smi.clk_apb);
larb->smi.clk_smi = devm_clk_get(dev, "smi");
if (IS_ERR(larb->smi.clk_smi))
return PTR_ERR(larb->smi.clk_smi);
larb->smi.dev = dev;
smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
if (!smi_node)
return -EINVAL;
smi_pdev = of_find_device_by_node(smi_node);
of_node_put(smi_node);
if (smi_pdev) {
larb->smi_common_dev = &smi_pdev->dev;
} else {
dev_err(dev, "Failed to get the smi_common device\n");
return -EINVAL;
}
pm_runtime_enable(dev);
platform_set_drvdata(pdev, larb);
return component_add(dev, &mtk_smi_larb_component_ops);
}
static int mtk_smi_larb_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
component_del(&pdev->dev, &mtk_smi_larb_component_ops);
return 0;
}
static struct platform_driver mtk_smi_larb_driver = {
.probe = mtk_smi_larb_probe,
.remove = mtk_smi_larb_remove,
.driver = {
.name = "mtk-smi-larb",
.of_match_table = mtk_smi_larb_of_ids,
}
};
static const struct of_device_id mtk_smi_common_of_ids[] = {
{
.compatible = "mediatek,mt8173-smi-common",
.data = (void *)MTK_SMI_GEN2
},
{
.compatible = "mediatek,mt2701-smi-common",
.data = (void *)MTK_SMI_GEN1
},
{}
};
static int mtk_smi_common_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_smi *common;
struct resource *res;
const struct of_device_id *of_id;
enum mtk_smi_gen smi_gen;
if (!dev->pm_domain)
return -EPROBE_DEFER;
common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
if (!common)
return -ENOMEM;
common->dev = dev;
common->clk_apb = devm_clk_get(dev, "apb");
if (IS_ERR(common->clk_apb))
return PTR_ERR(common->clk_apb);
common->clk_smi = devm_clk_get(dev, "smi");
if (IS_ERR(common->clk_smi))
return PTR_ERR(common->clk_smi);
of_id = of_match_node(mtk_smi_common_of_ids, pdev->dev.of_node);
if (!of_id)
return -EINVAL;
/*
* for mtk smi gen 1, we need to get the ao(always on) base to config
* m4u port, and we need to enable the aync clock for transform the smi
* clock into emi clock domain, but for mtk smi gen2, there's no smi ao
* base.
*/
smi_gen = (enum mtk_smi_gen)of_id->data;
if (smi_gen == MTK_SMI_GEN1) {
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
common->smi_ao_base = devm_ioremap_resource(dev, res);
if (IS_ERR(common->smi_ao_base))
return PTR_ERR(common->smi_ao_base);
common->clk_async = devm_clk_get(dev, "async");
if (IS_ERR(common->clk_async))
return PTR_ERR(common->clk_async);
clk_prepare_enable(common->clk_async);
}
pm_runtime_enable(dev);
platform_set_drvdata(pdev, common);
return 0;
}
static int mtk_smi_common_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
return 0;
}
static struct platform_driver mtk_smi_common_driver = {
.probe = mtk_smi_common_probe,
.remove = mtk_smi_common_remove,
.driver = {
.name = "mtk-smi-common",
.of_match_table = mtk_smi_common_of_ids,
}
};
static int __init mtk_smi_init(void)
{
int ret;
ret = platform_driver_register(&mtk_smi_common_driver);
if (ret != 0) {
pr_err("Failed to register SMI driver\n");
return ret;
}
ret = platform_driver_register(&mtk_smi_larb_driver);
if (ret != 0) {
pr_err("Failed to register SMI-LARB driver\n");
goto err_unreg_smi;
}
return ret;
err_unreg_smi:
platform_driver_unregister(&mtk_smi_common_driver);
return ret;
}
subsys_initcall(mtk_smi_init);