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// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/types.h>
#include "spi-pxa2xx.h"
static bool pxa2xx_spi_idma_filter(struct dma_chan *chan, void *param)
{
return param == chan->device->dev;
}
static int
pxa2xx_spi_init_ssp(struct platform_device *pdev, struct ssp_device *ssp, enum pxa_ssp_type type)
{
struct device *dev = &pdev->dev;
struct resource *res;
int status;
u64 uid;
ssp->mmio_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(ssp->mmio_base))
return PTR_ERR(ssp->mmio_base);
ssp->phys_base = res->start;
ssp->clk = devm_clk_get(dev, NULL);
if (IS_ERR(ssp->clk))
return PTR_ERR(ssp->clk);
ssp->irq = platform_get_irq(pdev, 0);
if (ssp->irq < 0)
return ssp->irq;
ssp->type = type;
ssp->dev = dev;
status = acpi_dev_uid_to_integer(ACPI_COMPANION(dev), &uid);
if (status)
ssp->port_id = -1;
else
ssp->port_id = uid;
return 0;
}
static void pxa2xx_spi_ssp_release(void *ssp)
{
pxa_ssp_free(ssp);
}
static struct ssp_device *pxa2xx_spi_ssp_request(struct platform_device *pdev)
{
struct ssp_device *ssp;
int status;
ssp = pxa_ssp_request(pdev->id, pdev->name);
if (!ssp)
return ssp;
status = devm_add_action_or_reset(&pdev->dev, pxa2xx_spi_ssp_release, ssp);
if (status)
return ERR_PTR(status);
return ssp;
}
static struct pxa2xx_spi_controller *
pxa2xx_spi_init_pdata(struct platform_device *pdev)
{
struct pxa2xx_spi_controller *pdata;
struct device *dev = &pdev->dev;
struct device *parent = dev->parent;
const void *match = device_get_match_data(dev);
enum pxa_ssp_type type = SSP_UNDEFINED;
struct ssp_device *ssp;
bool is_lpss_priv;
u32 num_cs = 1;
int status;
ssp = pxa2xx_spi_ssp_request(pdev);
if (IS_ERR(ssp))
return ERR_CAST(ssp);
if (ssp) {
type = ssp->type;
} else if (match) {
type = (enum pxa_ssp_type)(uintptr_t)match;
} else {
u32 value;
status = device_property_read_u32(dev, "intel,spi-pxa2xx-type", &value);
if (status)
return ERR_PTR(status);
type = (enum pxa_ssp_type)value;
}
/* Validate the SSP type correctness */
if (!(type > SSP_UNDEFINED && type < SSP_MAX))
return ERR_PTR(-EINVAL);
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
/* Platforms with iDMA 64-bit */
is_lpss_priv = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpss_priv");
if (is_lpss_priv) {
pdata->tx_param = parent;
pdata->rx_param = parent;
pdata->dma_filter = pxa2xx_spi_idma_filter;
}
/* Read number of chip select pins, if provided */
device_property_read_u32(dev, "num-cs", &num_cs);
pdata->num_chipselect = num_cs;
pdata->is_target = device_property_read_bool(dev, "spi-slave");
pdata->enable_dma = true;
pdata->dma_burst_size = 1;
/* If SSP has been already enumerated, use it */
if (ssp)
return pdata;
status = pxa2xx_spi_init_ssp(pdev, &pdata->ssp, type);
if (status)
return ERR_PTR(status);
return pdata;
}
static int pxa2xx_spi_platform_probe(struct platform_device *pdev)
{
struct pxa2xx_spi_controller *platform_info;
struct device *dev = &pdev->dev;
struct ssp_device *ssp;
platform_info = dev_get_platdata(dev);
if (!platform_info) {
platform_info = pxa2xx_spi_init_pdata(pdev);
if (IS_ERR(platform_info))
return dev_err_probe(dev, PTR_ERR(platform_info), "missing platform data\n");
dev->platform_data = platform_info;
}
ssp = pxa2xx_spi_ssp_request(pdev);
if (IS_ERR(ssp))
return PTR_ERR(ssp);
if (!ssp)
ssp = &platform_info->ssp;
return pxa2xx_spi_probe(dev, ssp);
}
static void pxa2xx_spi_platform_remove(struct platform_device *pdev)
{
pxa2xx_spi_remove(&pdev->dev);
}
static const struct acpi_device_id pxa2xx_spi_acpi_match[] = {
{ "80860F0E" },
{ "8086228E" },
{ "INT33C0" },
{ "INT33C1" },
{ "INT3430" },
{ "INT3431" },
{}
};
MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
static const struct of_device_id pxa2xx_spi_of_match[] = {
{ .compatible = "marvell,mmp2-ssp", .data = (void *)MMP2_SSP },
{}
};
MODULE_DEVICE_TABLE(of, pxa2xx_spi_of_match);
static struct platform_driver driver = {
.driver = {
.name = "pxa2xx-spi",
.pm = pm_ptr(&pxa2xx_spi_pm_ops),
.acpi_match_table = pxa2xx_spi_acpi_match,
.of_match_table = pxa2xx_spi_of_match,
},
.probe = pxa2xx_spi_platform_probe,
.remove_new = pxa2xx_spi_platform_remove,
};
static int __init pxa2xx_spi_init(void)
{
return platform_driver_register(&driver);
}
subsys_initcall(pxa2xx_spi_init);
static void __exit pxa2xx_spi_exit(void)
{
platform_driver_unregister(&driver);
}
module_exit(pxa2xx_spi_exit);
MODULE_AUTHOR("Stephen Street");
MODULE_DESCRIPTION("PXA2xx SSP SPI Controller platform driver");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(SPI_PXA2xx);
MODULE_ALIAS("platform:pxa2xx-spi");
MODULE_SOFTDEP("pre: dw_dmac");
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