linux/drivers/spi/spi-dw-pci.c
Jarkko Nikula c97905cae9
spi: dw-pci: Fix Chip Select amount on Intel Elkhart Lake PSE SPI
Intel(R) Programmable Services Engine (Intel(R) PSE) SPI controllers in
Intel Elkhart Lake have two Chip Select signals instead of one.

Reported-by: Raymond Tan <raymond.tan@intel.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Link: https://lore.kernel.org/r/20191018132131.31608-3-jarkko.nikula@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2019-10-22 17:57:43 +01:00

176 lines
4.0 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* PCI interface driver for DW SPI Core
*
* Copyright (c) 2009, 2014 Intel Corporation.
*/
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
#include "spi-dw.h"
#define DRIVER_NAME "dw_spi_pci"
struct spi_pci_desc {
int (*setup)(struct dw_spi *);
u16 num_cs;
u16 bus_num;
u32 max_freq;
};
static struct spi_pci_desc spi_pci_mid_desc_1 = {
.setup = dw_spi_mid_init,
.num_cs = 5,
.bus_num = 0,
};
static struct spi_pci_desc spi_pci_mid_desc_2 = {
.setup = dw_spi_mid_init,
.num_cs = 2,
.bus_num = 1,
};
static struct spi_pci_desc spi_pci_ehl_desc = {
.num_cs = 2,
.bus_num = -1,
.max_freq = 100000000,
};
static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct dw_spi *dws;
struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data;
int pci_bar = 0;
int ret;
ret = pcim_enable_device(pdev);
if (ret)
return ret;
dws = devm_kzalloc(&pdev->dev, sizeof(*dws), GFP_KERNEL);
if (!dws)
return -ENOMEM;
/* Get basic io resource and map it */
dws->paddr = pci_resource_start(pdev, pci_bar);
pci_set_master(pdev);
ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev));
if (ret)
return ret;
ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
if (ret < 0)
return ret;
dws->regs = pcim_iomap_table(pdev)[pci_bar];
dws->irq = pci_irq_vector(pdev, 0);
/*
* Specific handling for platforms, like dma setup,
* clock rate, FIFO depth.
*/
if (desc) {
dws->num_cs = desc->num_cs;
dws->bus_num = desc->bus_num;
dws->max_freq = desc->max_freq;
if (desc->setup) {
ret = desc->setup(dws);
if (ret)
return ret;
}
} else {
pci_free_irq_vectors(pdev);
return -ENODEV;
}
ret = dw_spi_add_host(&pdev->dev, dws);
if (ret) {
pci_free_irq_vectors(pdev);
return ret;
}
/* PCI hook and SPI hook use the same drv data */
pci_set_drvdata(pdev, dws);
dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n",
pdev->vendor, pdev->device);
pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
pm_runtime_allow(&pdev->dev);
return 0;
}
static void spi_pci_remove(struct pci_dev *pdev)
{
struct dw_spi *dws = pci_get_drvdata(pdev);
pm_runtime_forbid(&pdev->dev);
pm_runtime_get_noresume(&pdev->dev);
dw_spi_remove_host(dws);
pci_free_irq_vectors(pdev);
}
#ifdef CONFIG_PM_SLEEP
static int spi_suspend(struct device *dev)
{
struct dw_spi *dws = dev_get_drvdata(dev);
return dw_spi_suspend_host(dws);
}
static int spi_resume(struct device *dev)
{
struct dw_spi *dws = dev_get_drvdata(dev);
return dw_spi_resume_host(dws);
}
#endif
static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume);
static const struct pci_device_id pci_ids[] = {
/* Intel MID platform SPI controller 0 */
/*
* The access to the device 8086:0801 is disabled by HW, since it's
* exclusively used by SCU to communicate with MSIC.
*/
/* Intel MID platform SPI controller 1 */
{ PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1},
/* Intel MID platform SPI controller 2 */
{ PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2},
/* Intel Elkhart Lake PSE SPI controllers */
{ PCI_VDEVICE(INTEL, 0x4b84), (kernel_ulong_t)&spi_pci_ehl_desc},
{ PCI_VDEVICE(INTEL, 0x4b85), (kernel_ulong_t)&spi_pci_ehl_desc},
{ PCI_VDEVICE(INTEL, 0x4b86), (kernel_ulong_t)&spi_pci_ehl_desc},
{ PCI_VDEVICE(INTEL, 0x4b87), (kernel_ulong_t)&spi_pci_ehl_desc},
{},
};
MODULE_DEVICE_TABLE(pci, pci_ids);
static struct pci_driver dw_spi_driver = {
.name = DRIVER_NAME,
.id_table = pci_ids,
.probe = spi_pci_probe,
.remove = spi_pci_remove,
.driver = {
.pm = &dw_spi_pm_ops,
},
};
module_pci_driver(dw_spi_driver);
MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
MODULE_LICENSE("GPL v2");