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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015-2016 MediaTek Inc.
* Author: Yong Wu <yong.wu@mediatek.com>
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.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>
/* mt8173 */
#define SMI_LARB_MMU_EN 0xf00
/* mt2701 */
#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))
/* mt2712 */
#define SMI_LARB_NONSEC_CON(id) (0x380 + ((id) * 4))
#define F_MMU_EN BIT(0)
enum mtk_smi_gen {
MTK_SMI_GEN1,
MTK_SMI_GEN2
};
struct mtk_smi_common_plat {
enum mtk_smi_gen gen;
bool has_gals;
};
struct mtk_smi_larb_gen {
bool need_larbid;
int port_in_larb[MTK_LARB_NR_MAX + 1];
void (*config_port)(struct device *);
unsigned int larb_direct_to_common_mask;
bool has_gals;
};
struct mtk_smi {
struct device *dev;
struct clk *clk_apb, *clk_smi;
struct clk *clk_gals0, *clk_gals1;
struct clk *clk_async; /*only needed by mt2701*/
void __iomem *smi_ao_base;
const struct mtk_smi_common_plat *plat;
};
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;
};
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;
ret = clk_prepare_enable(smi->clk_gals0);
if (ret)
goto err_disable_smi;
ret = clk_prepare_enable(smi->clk_gals1);
if (ret)
goto err_disable_gals0;
return 0;
err_disable_gals0:
clk_disable_unprepare(smi->clk_gals0);
err_disable_smi:
clk_disable_unprepare(smi->clk_smi);
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_gals1);
clk_disable_unprepare(smi->clk_gals0);
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;
if (larb->larb_gen->need_larbid) {
larb->mmu = &smi_iommu->larb_imu[larb->larbid].mmu;
return 0;
}
/*
* If there is no larbid property, Loop to find the corresponding
* iommu information.
*/
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_gen2_general(struct device *dev)
{
struct mtk_smi_larb *larb = dev_get_drvdata(dev);
u32 reg;
int i;
if (BIT(larb->larbid) & larb->larb_gen->larb_direct_to_common_mask)
return;
for_each_set_bit(i, (unsigned long *)larb->mmu, 32) {
reg = readl_relaxed(larb->base + SMI_LARB_NONSEC_CON(i));
reg |= F_MMU_EN;
writel(reg, larb->base + SMI_LARB_NONSEC_CON(i));
}
}
static void mtk_smi_larb_config_port_mt8173(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_mt8173,
};
static const struct mtk_smi_larb_gen mtk_smi_larb_mt2701 = {
.need_larbid = true,
.port_in_larb
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