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The Aspeed eSPI controller is slave device to communicate with the master through the Enhanced Serial Peripheral Interface (eSPI). All of the four eSPI channels, namely peripheral, virtual wire, out-of-band, and flash are supported. Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com> Reported-by: kernel test robot <lkp@intel.com>
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// SPDX-License-Identifier: GPL-2.0+ | ||
/* | ||
* Copyright 2021 Aspeed Technology Inc. | ||
*/ | ||
#include <linux/io.h> | ||
#include <linux/irq.h> | ||
#include <linux/clk.h> | ||
#include <linux/module.h> | ||
#include <linux/of_device.h> | ||
#include <linux/interrupt.h> | ||
#include <linux/platform_device.h> | ||
#include <linux/miscdevice.h> | ||
#include <linux/dma-mapping.h> | ||
#include <linux/mfd/syscon.h> | ||
#include <linux/regmap.h> | ||
#include <linux/uaccess.h> | ||
#include <linux/vmalloc.h> | ||
#include "aspeed-espi-ioc.h" | ||
#include "aspeed-espi-ctrl.h" | ||
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/* include alloc/free/event/ioctl handlers of the eSPI 4 channels */ | ||
#include "aspeed-espi-perif.h" | ||
#include "aspeed-espi-vw.h" | ||
#include "aspeed-espi-oob.h" | ||
#include "aspeed-espi-flash.h" | ||
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#define DEVICE_NAME "aspeed-espi-ctrl" | ||
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static irqreturn_t aspeed_espi_ctrl_isr(int irq, void *arg) | ||
{ | ||
uint32_t sts; | ||
struct aspeed_espi_ctrl *espi_ctrl = (struct aspeed_espi_ctrl *)arg; | ||
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regmap_read(espi_ctrl->map, ESPI_INT_STS, &sts); | ||
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if (sts & ESPI_INT_STS_PERIF_BITS) { | ||
aspeed_espi_perif_event(sts, espi_ctrl->perif); | ||
regmap_write(espi_ctrl->map, ESPI_INT_STS, sts & ESPI_INT_STS_PERIF_BITS); | ||
} | ||
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if (sts & ESPI_INT_STS_VW_BITS) { | ||
aspeed_espi_vw_event(sts, espi_ctrl->vw); | ||
regmap_write(espi_ctrl->map, ESPI_INT_STS, sts & ESPI_INT_STS_VW_BITS); | ||
} | ||
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if (sts & (ESPI_INT_STS_OOB_BITS)) { | ||
aspeed_espi_oob_event(sts, espi_ctrl->oob); | ||
regmap_write(espi_ctrl->map, ESPI_INT_STS, sts & ESPI_INT_STS_OOB_BITS); | ||
} | ||
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if (sts & ESPI_INT_STS_FLASH_BITS) { | ||
aspeed_espi_flash_event(sts, espi_ctrl->flash); | ||
regmap_write(espi_ctrl->map, ESPI_INT_STS, sts & ESPI_INT_STS_FLASH_BITS); | ||
} | ||
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if (sts & ESPI_INT_STS_HW_RST_DEASSERT) { | ||
aspeed_espi_perif_enable(espi_ctrl->perif); | ||
aspeed_espi_vw_enable(espi_ctrl->vw); | ||
aspeed_espi_oob_enable(espi_ctrl->oob); | ||
aspeed_espi_flash_enable(espi_ctrl->flash); | ||
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regmap_write(espi_ctrl->map, ESPI_SYSEVT_INT_T0, 0x0); | ||
regmap_write(espi_ctrl->map, ESPI_SYSEVT_INT_T1, 0x0); | ||
regmap_write(espi_ctrl->map, ESPI_SYSEVT_INT_EN, 0xffffffff); | ||
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regmap_write(espi_ctrl->map, ESPI_SYSEVT1_INT_T0, 0x1); | ||
regmap_write(espi_ctrl->map, ESPI_SYSEVT1_INT_EN, 0x1); | ||
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if (espi_ctrl->version == ESPI_AST2500) | ||
regmap_write(espi_ctrl->map, ESPI_SYSEVT_INT_T2, | ||
ESPI_SYSEVT_INT_T2_HOST_RST_WARN | | ||
ESPI_SYSEVT_INT_T2_OOB_RST_WARN); | ||
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regmap_update_bits(espi_ctrl->map, ESPI_INT_EN, | ||
ESPI_INT_EN_HW_RST_DEASSERT, | ||
ESPI_INT_EN_HW_RST_DEASSERT); | ||
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regmap_update_bits(espi_ctrl->map, ESPI_SYSEVT, | ||
ESPI_SYSEVT_SLV_BOOT_STS | ESPI_SYSEVT_SLV_BOOT_DONE, | ||
ESPI_SYSEVT_SLV_BOOT_STS | ESPI_SYSEVT_SLV_BOOT_DONE); | ||
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regmap_write(espi_ctrl->map, ESPI_INT_STS, ESPI_INT_STS_HW_RST_DEASSERT); | ||
} | ||
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return IRQ_HANDLED; | ||
} | ||
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static int aspeed_espi_ctrl_probe(struct platform_device *pdev) | ||
{ | ||
int rc = 0; | ||
struct aspeed_espi_ctrl *espi_ctrl; | ||
struct device *dev = &pdev->dev; | ||
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espi_ctrl = devm_kzalloc(dev, sizeof(*espi_ctrl), GFP_KERNEL); | ||
if (!espi_ctrl) | ||
return -ENOMEM; | ||
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espi_ctrl->version = (uint32_t)of_device_get_match_data(dev); | ||
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espi_ctrl->map = syscon_node_to_regmap(dev->parent->of_node); | ||
if (IS_ERR(espi_ctrl->map)) { | ||
dev_err(dev, "cannot get remap\n"); | ||
return -ENODEV; | ||
} | ||
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espi_ctrl->irq = platform_get_irq(pdev, 0); | ||
if (espi_ctrl->irq < 0) | ||
return espi_ctrl->irq; | ||
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espi_ctrl->clk = devm_clk_get(dev, NULL); | ||
if (IS_ERR(espi_ctrl->clk)) { | ||
dev_err(dev, "cannot get clock\n"); | ||
return -ENODEV; | ||
} | ||
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rc = clk_prepare_enable(espi_ctrl->clk); | ||
if (rc) { | ||
dev_err(dev, "cannot enable clock\n"); | ||
return rc; | ||
} | ||
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espi_ctrl->perif = aspeed_espi_perif_alloc(dev, espi_ctrl); | ||
if (IS_ERR(espi_ctrl->perif)) { | ||
dev_err(dev, "failed to allocate peripheral channel\n"); | ||
return PTR_ERR(espi_ctrl->perif); | ||
} | ||
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espi_ctrl->vw = aspeed_espi_vw_alloc(dev, espi_ctrl); | ||
if (IS_ERR(espi_ctrl->vw)) { | ||
dev_err(dev, "failed to allocate virtual wire channel\n"); | ||
return PTR_ERR(espi_ctrl->vw); | ||
} | ||
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espi_ctrl->oob = aspeed_espi_oob_alloc(dev, espi_ctrl); | ||
if (IS_ERR(espi_ctrl->oob)) { | ||
dev_err(dev, "failed to allocate out-of-band channel\n"); | ||
return PTR_ERR(espi_ctrl->oob); | ||
} | ||
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espi_ctrl->flash = aspeed_espi_flash_alloc(dev, espi_ctrl); | ||
if (rc) { | ||
dev_err(dev, "failed to allocate flash channel\n"); | ||
return PTR_ERR(espi_ctrl->flash); | ||
} | ||
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regmap_write(espi_ctrl->map, ESPI_SYSEVT_INT_T0, 0x0); | ||
regmap_write(espi_ctrl->map, ESPI_SYSEVT_INT_T1, 0x0); | ||
regmap_write(espi_ctrl->map, ESPI_SYSEVT_INT_EN, 0xffffffff); | ||
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regmap_write(espi_ctrl->map, ESPI_SYSEVT1_INT_T0, 0x1); | ||
regmap_write(espi_ctrl->map, ESPI_SYSEVT1_INT_EN, 0x1); | ||
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rc = devm_request_irq(dev, espi_ctrl->irq, | ||
aspeed_espi_ctrl_isr, | ||
0, DEVICE_NAME, espi_ctrl); | ||
if (rc) { | ||
dev_err(dev, "failed to request IRQ\n"); | ||
return rc; | ||
} | ||
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regmap_update_bits(espi_ctrl->map, ESPI_INT_EN, | ||
ESPI_INT_EN_HW_RST_DEASSERT, | ||
ESPI_INT_EN_HW_RST_DEASSERT); | ||
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dev_set_drvdata(dev, espi_ctrl); | ||
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dev_info(dev, "module loaded\n"); | ||
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return 0; | ||
} | ||
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static int aspeed_espi_ctrl_remove(struct platform_device *pdev) | ||
{ | ||
struct device *dev = &pdev->dev; | ||
struct aspeed_espi_ctrl *espi_ctrl = dev_get_drvdata(dev); | ||
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aspeed_espi_perif_free(dev, espi_ctrl->perif); | ||
aspeed_espi_vw_free(dev, espi_ctrl->vw); | ||
aspeed_espi_oob_free(dev, espi_ctrl->oob); | ||
aspeed_espi_flash_free(dev, espi_ctrl->flash); | ||
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return 0; | ||
} | ||
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static const struct of_device_id aspeed_espi_ctrl_of_matches[] = { | ||
{ .compatible = "aspeed,ast2500-espi-ctrl", .data = (void *)ESPI_AST2500 }, | ||
{ .compatible = "aspeed,ast2600-espi-ctrl", .data = (void *)ESPI_AST2600 }, | ||
{ }, | ||
}; | ||
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static struct platform_driver aspeed_espi_ctrl_driver = { | ||
.driver = { | ||
.name = DEVICE_NAME, | ||
.of_match_table = aspeed_espi_ctrl_of_matches, | ||
}, | ||
.probe = aspeed_espi_ctrl_probe, | ||
.remove = aspeed_espi_ctrl_remove, | ||
}; | ||
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module_platform_driver(aspeed_espi_ctrl_driver); | ||
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MODULE_AUTHOR("Chia-Wei Wang <chiawei_wang@aspeedtech.com>"); | ||
MODULE_AUTHOR("Ryan Chen <ryan_chen@aspeedtech.com>"); | ||
MODULE_DESCRIPTION("Control of Aspeed eSPI Slave Device"); | ||
MODULE_LICENSE("GPL v2"); |
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