ed68052226
Only few drivers use this call, so drivers and I2C core are converted at once with this patch. By simply using i2c_new_client_device() instead of i2c_new_device(), we easily can return an ERRPTR for this function as well. To make out of tree users aware that something changed, the function is renamed to i2c_new_smbus_alert_device(). Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
265 lines
6.1 KiB
C
265 lines
6.1 KiB
C
/*
|
|
* Cavium ThunderX i2c driver.
|
|
*
|
|
* Copyright (C) 2015,2016 Cavium Inc.
|
|
* Authors: Fred Martin <fmartin@caviumnetworks.com>
|
|
* Jan Glauber <jglauber@cavium.com>
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/i2c-smbus.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/pci.h>
|
|
|
|
#include "i2c-octeon-core.h"
|
|
|
|
#define DRV_NAME "i2c-thunderx"
|
|
|
|
#define PCI_DEVICE_ID_THUNDER_TWSI 0xa012
|
|
|
|
#define SYS_FREQ_DEFAULT 700000000
|
|
|
|
#define TWSI_INT_ENA_W1C 0x1028
|
|
#define TWSI_INT_ENA_W1S 0x1030
|
|
|
|
/*
|
|
* Enable the CORE interrupt.
|
|
* The interrupt will be asserted when there is non-STAT_IDLE state in the
|
|
* SW_TWSI_EOP_TWSI_STAT register.
|
|
*/
|
|
static void thunder_i2c_int_enable(struct octeon_i2c *i2c)
|
|
{
|
|
octeon_i2c_writeq_flush(TWSI_INT_CORE_INT,
|
|
i2c->twsi_base + TWSI_INT_ENA_W1S);
|
|
}
|
|
|
|
/*
|
|
* Disable the CORE interrupt.
|
|
*/
|
|
static void thunder_i2c_int_disable(struct octeon_i2c *i2c)
|
|
{
|
|
octeon_i2c_writeq_flush(TWSI_INT_CORE_INT,
|
|
i2c->twsi_base + TWSI_INT_ENA_W1C);
|
|
}
|
|
|
|
static void thunder_i2c_hlc_int_enable(struct octeon_i2c *i2c)
|
|
{
|
|
octeon_i2c_writeq_flush(TWSI_INT_ST_INT | TWSI_INT_TS_INT,
|
|
i2c->twsi_base + TWSI_INT_ENA_W1S);
|
|
}
|
|
|
|
static void thunder_i2c_hlc_int_disable(struct octeon_i2c *i2c)
|
|
{
|
|
octeon_i2c_writeq_flush(TWSI_INT_ST_INT | TWSI_INT_TS_INT,
|
|
i2c->twsi_base + TWSI_INT_ENA_W1C);
|
|
}
|
|
|
|
static u32 thunderx_i2c_functionality(struct i2c_adapter *adap)
|
|
{
|
|
return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) |
|
|
I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_SMBUS_BLOCK_PROC_CALL;
|
|
}
|
|
|
|
static const struct i2c_algorithm thunderx_i2c_algo = {
|
|
.master_xfer = octeon_i2c_xfer,
|
|
.functionality = thunderx_i2c_functionality,
|
|
};
|
|
|
|
static const struct i2c_adapter thunderx_i2c_ops = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ThunderX adapter",
|
|
.algo = &thunderx_i2c_algo,
|
|
};
|
|
|
|
static void thunder_i2c_clock_enable(struct device *dev, struct octeon_i2c *i2c)
|
|
{
|
|
int ret;
|
|
|
|
if (acpi_disabled) {
|
|
/* DT */
|
|
i2c->clk = clk_get(dev, NULL);
|
|
if (IS_ERR(i2c->clk)) {
|
|
i2c->clk = NULL;
|
|
goto skip;
|
|
}
|
|
|
|
ret = clk_prepare_enable(i2c->clk);
|
|
if (ret)
|
|
goto skip;
|
|
i2c->sys_freq = clk_get_rate(i2c->clk);
|
|
} else {
|
|
/* ACPI */
|
|
device_property_read_u32(dev, "sclk", &i2c->sys_freq);
|
|
}
|
|
|
|
skip:
|
|
if (!i2c->sys_freq)
|
|
i2c->sys_freq = SYS_FREQ_DEFAULT;
|
|
}
|
|
|
|
static void thunder_i2c_clock_disable(struct device *dev, struct clk *clk)
|
|
{
|
|
if (!clk)
|
|
return;
|
|
clk_disable_unprepare(clk);
|
|
clk_put(clk);
|
|
}
|
|
|
|
static int thunder_i2c_smbus_setup_of(struct octeon_i2c *i2c,
|
|
struct device_node *node)
|
|
{
|
|
struct i2c_client *ara;
|
|
|
|
if (!node)
|
|
return -EINVAL;
|
|
|
|
i2c->alert_data.irq = irq_of_parse_and_map(node, 0);
|
|
if (!i2c->alert_data.irq)
|
|
return -EINVAL;
|
|
|
|
ara = i2c_new_smbus_alert_device(&i2c->adap, &i2c->alert_data);
|
|
if (IS_ERR(ara))
|
|
return PTR_ERR(ara);
|
|
|
|
i2c->ara = ara;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int thunder_i2c_smbus_setup(struct octeon_i2c *i2c,
|
|
struct device_node *node)
|
|
{
|
|
/* TODO: ACPI support */
|
|
if (!acpi_disabled)
|
|
return -EOPNOTSUPP;
|
|
|
|
return thunder_i2c_smbus_setup_of(i2c, node);
|
|
}
|
|
|
|
static void thunder_i2c_smbus_remove(struct octeon_i2c *i2c)
|
|
{
|
|
i2c_unregister_device(i2c->ara);
|
|
}
|
|
|
|
static int thunder_i2c_probe_pci(struct pci_dev *pdev,
|
|
const struct pci_device_id *ent)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct octeon_i2c *i2c;
|
|
int ret;
|
|
|
|
i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);
|
|
if (!i2c)
|
|
return -ENOMEM;
|
|
|
|
i2c->roff.sw_twsi = 0x1000;
|
|
i2c->roff.twsi_int = 0x1010;
|
|
i2c->roff.sw_twsi_ext = 0x1018;
|
|
|
|
i2c->dev = dev;
|
|
pci_set_drvdata(pdev, i2c);
|
|
ret = pcim_enable_device(pdev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = pci_request_regions(pdev, DRV_NAME);
|
|
if (ret)
|
|
return ret;
|
|
|
|
i2c->twsi_base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
|
|
if (!i2c->twsi_base)
|
|
return -EINVAL;
|
|
|
|
thunder_i2c_clock_enable(dev, i2c);
|
|
ret = device_property_read_u32(dev, "clock-frequency", &i2c->twsi_freq);
|
|
if (ret)
|
|
i2c->twsi_freq = 100000;
|
|
|
|
init_waitqueue_head(&i2c->queue);
|
|
|
|
i2c->int_enable = thunder_i2c_int_enable;
|
|
i2c->int_disable = thunder_i2c_int_disable;
|
|
i2c->hlc_int_enable = thunder_i2c_hlc_int_enable;
|
|
i2c->hlc_int_disable = thunder_i2c_hlc_int_disable;
|
|
|
|
ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSIX);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
ret = devm_request_irq(dev, pci_irq_vector(pdev, 0), octeon_i2c_isr, 0,
|
|
DRV_NAME, i2c);
|
|
if (ret)
|
|
goto error;
|
|
|
|
ret = octeon_i2c_init_lowlevel(i2c);
|
|
if (ret)
|
|
goto error;
|
|
|
|
octeon_i2c_set_clock(i2c);
|
|
|
|
i2c->adap = thunderx_i2c_ops;
|
|
i2c->adap.retries = 5;
|
|
i2c->adap.class = I2C_CLASS_HWMON;
|
|
i2c->adap.bus_recovery_info = &octeon_i2c_recovery_info;
|
|
i2c->adap.dev.parent = dev;
|
|
i2c->adap.dev.of_node = pdev->dev.of_node;
|
|
snprintf(i2c->adap.name, sizeof(i2c->adap.name),
|
|
"Cavium ThunderX i2c adapter at %s", dev_name(dev));
|
|
i2c_set_adapdata(&i2c->adap, i2c);
|
|
|
|
ret = i2c_add_adapter(&i2c->adap);
|
|
if (ret)
|
|
goto error;
|
|
|
|
dev_info(i2c->dev, "Probed. Set system clock to %u\n", i2c->sys_freq);
|
|
|
|
ret = thunder_i2c_smbus_setup(i2c, pdev->dev.of_node);
|
|
if (ret)
|
|
dev_info(dev, "SMBUS alert not active on this bus\n");
|
|
|
|
return 0;
|
|
|
|
error:
|
|
thunder_i2c_clock_disable(dev, i2c->clk);
|
|
return ret;
|
|
}
|
|
|
|
static void thunder_i2c_remove_pci(struct pci_dev *pdev)
|
|
{
|
|
struct octeon_i2c *i2c = pci_get_drvdata(pdev);
|
|
|
|
thunder_i2c_smbus_remove(i2c);
|
|
thunder_i2c_clock_disable(&pdev->dev, i2c->clk);
|
|
i2c_del_adapter(&i2c->adap);
|
|
}
|
|
|
|
static const struct pci_device_id thunder_i2c_pci_id_table[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVICE_ID_THUNDER_TWSI) },
|
|
{ 0, }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pci, thunder_i2c_pci_id_table);
|
|
|
|
static struct pci_driver thunder_i2c_pci_driver = {
|
|
.name = DRV_NAME,
|
|
.id_table = thunder_i2c_pci_id_table,
|
|
.probe = thunder_i2c_probe_pci,
|
|
.remove = thunder_i2c_remove_pci,
|
|
};
|
|
|
|
module_pci_driver(thunder_i2c_pci_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Fred Martin <fmartin@caviumnetworks.com>");
|
|
MODULE_DESCRIPTION("I2C-Bus adapter for Cavium ThunderX SOC");
|