spi_mpc83xx: add OF platform driver bindings
Implement full support for OF SPI bindings. Now the driver can manage its own chip selects without any help from the board files and/or fsl_soc constructors. The "legacy" code is well isolated and could be removed as time goes by. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Cc: David Brownell <david-b@pacbell.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Kumar Gala <galak@gate.crashing.org> Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>hifive-unleashed-5.1
Anton Vorontsov
Linus Torvalds
parent
364fdbc00f
commit
35b4b3c0c1
|
|
@ -14,6 +14,8 @@
|
|||
#include <linux/init.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/completion.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/delay.h>
|
||||
|
|
@ -23,7 +25,13 @@
|
|||
#include <linux/spi/spi_bitbang.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/fsl_devices.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/of_platform.h>
|
||||
#include <linux/gpio.h>
|
||||
#include <linux/of_gpio.h>
|
||||
#include <linux/of_spi.h>
|
||||
|
||||
#include <sysdev/fsl_soc.h>
|
||||
#include <asm/irq.h>
|
||||
#include <asm/io.h>
|
||||
|
||||
|
|
@ -79,7 +87,7 @@ struct mpc83xx_spi {
|
|||
u32(*get_tx) (struct mpc83xx_spi *);
|
||||
|
||||
unsigned int count;
|
||||
int irq;
|
||||
unsigned int irq;
|
||||
|
||||
unsigned nsecs; /* (clock cycle time)/2 */
|
||||
|
||||
|
|
@ -543,36 +551,23 @@ static void mpc83xx_spi_cleanup(struct spi_device *spi)
|
|||
kfree(spi->controller_state);
|
||||
}
|
||||
|
||||
static int __init mpc83xx_spi_probe(struct platform_device *dev)
|
||||
static struct spi_master * __devinit
|
||||
mpc83xx_spi_probe(struct device *dev, struct resource *mem, unsigned int irq)
|
||||
{
|
||||
struct fsl_spi_platform_data *pdata = dev->platform_data;
|
||||
struct spi_master *master;
|
||||
struct mpc83xx_spi *mpc83xx_spi;
|
||||
struct fsl_spi_platform_data *pdata;
|
||||
struct resource *r;
|
||||
u32 regval;
|
||||
int ret = 0;
|
||||
|
||||
/* Get resources(memory, IRQ) associated with the device */
|
||||
master = spi_alloc_master(&dev->dev, sizeof(struct mpc83xx_spi));
|
||||
|
||||
master = spi_alloc_master(dev, sizeof(struct mpc83xx_spi));
|
||||
if (master == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto err;
|
||||
}
|
||||
|
||||
platform_set_drvdata(dev, master);
|
||||
pdata = dev->dev.platform_data;
|
||||
dev_set_drvdata(dev, master);
|
||||
|
||||
if (pdata == NULL) {
|
||||
ret = -ENODEV;
|
||||
goto free_master;
|
||||
}
|
||||
|
||||
r = platform_get_resource(dev, IORESOURCE_MEM, 0);
|
||||
if (r == NULL) {
|
||||
ret = -ENODEV;
|
||||
goto free_master;
|
||||
}
|
||||
master->setup = mpc83xx_spi_setup;
|
||||
master->transfer = mpc83xx_spi_transfer;
|
||||
master->cleanup = mpc83xx_spi_cleanup;
|
||||
|
|
@ -592,18 +587,13 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev)
|
|||
|
||||
init_completion(&mpc83xx_spi->done);
|
||||
|
||||
mpc83xx_spi->base = ioremap(r->start, r->end - r->start + 1);
|
||||
mpc83xx_spi->base = ioremap(mem->start, mem->end - mem->start + 1);
|
||||
if (mpc83xx_spi->base == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto put_master;
|
||||
}
|
||||
|
||||
mpc83xx_spi->irq = platform_get_irq(dev, 0);
|
||||
|
||||
if (mpc83xx_spi->irq < 0) {
|
||||
ret = -ENXIO;
|
||||
goto unmap_io;
|
||||
}
|
||||
mpc83xx_spi->irq = irq;
|
||||
|
||||
/* Register for SPI Interrupt */
|
||||
ret = request_irq(mpc83xx_spi->irq, mpc83xx_spi_irq,
|
||||
|
|
@ -645,9 +635,9 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev)
|
|||
|
||||
printk(KERN_INFO
|
||||
"%s: MPC83xx SPI Controller driver at 0x%p (irq = %d)\n",
|
||||
dev_name(&dev->dev), mpc83xx_spi->base, mpc83xx_spi->irq);
|
||||
dev_name(dev), mpc83xx_spi->base, mpc83xx_spi->irq);
|
||||
|
||||
return ret;
|
||||
return master;
|
||||
|
||||
unreg_master:
|
||||
destroy_workqueue(mpc83xx_spi->workqueue);
|
||||
|
|
@ -657,18 +647,16 @@ unmap_io:
|
|||
iounmap(mpc83xx_spi->base);
|
||||
put_master:
|
||||
spi_master_put(master);
|
||||
free_master:
|
||||
kfree(master);
|
||||
err:
|
||||
return ret;
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
static int __exit mpc83xx_spi_remove(struct platform_device *dev)
|
||||
static int __devexit mpc83xx_spi_remove(struct device *dev)
|
||||
{
|
||||
struct mpc83xx_spi *mpc83xx_spi;
|
||||
struct spi_master *master;
|
||||
|
||||
master = platform_get_drvdata(dev);
|
||||
master = dev_get_drvdata(dev);
|
||||
mpc83xx_spi = spi_master_get_devdata(master);
|
||||
|
||||
flush_workqueue(mpc83xx_spi->workqueue);
|
||||
|
|
@ -681,23 +669,293 @@ static int __exit mpc83xx_spi_remove(struct platform_device *dev)
|
|||
return 0;
|
||||
}
|
||||
|
||||
struct mpc83xx_spi_probe_info {
|
||||
struct fsl_spi_platform_data pdata;
|
||||
int *gpios;
|
||||
bool *alow_flags;
|
||||
};
|
||||
|
||||
static struct mpc83xx_spi_probe_info *
|
||||
to_of_pinfo(struct fsl_spi_platform_data *pdata)
|
||||
{
|
||||
return container_of(pdata, struct mpc83xx_spi_probe_info, pdata);
|
||||
}
|
||||
|
||||
static void mpc83xx_spi_cs_control(struct spi_device *spi, bool on)
|
||||
{
|
||||
struct device *dev = spi->dev.parent;
|
||||
struct mpc83xx_spi_probe_info *pinfo = to_of_pinfo(dev->platform_data);
|
||||
u16 cs = spi->chip_select;
|
||||
int gpio = pinfo->gpios[cs];
|
||||
bool alow = pinfo->alow_flags[cs];
|
||||
|
||||
gpio_set_value(gpio, on ^ alow);
|
||||
}
|
||||
|
||||
static int of_mpc83xx_spi_get_chipselects(struct device *dev)
|
||||
{
|
||||
struct device_node *np = dev_archdata_get_node(&dev->archdata);
|
||||
struct fsl_spi_platform_data *pdata = dev->platform_data;
|
||||
struct mpc83xx_spi_probe_info *pinfo = to_of_pinfo(pdata);
|
||||
unsigned int ngpios;
|
||||
int i = 0;
|
||||
int ret;
|
||||
|
||||
ngpios = of_gpio_count(np);
|
||||
if (!ngpios) {
|
||||
/*
|
||||
* SPI w/o chip-select line. One SPI device is still permitted
|
||||
* though.
|
||||
*/
|
||||
pdata->max_chipselect = 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
pinfo->gpios = kmalloc(ngpios * sizeof(pinfo->gpios), GFP_KERNEL);
|
||||
if (!pinfo->gpios)
|
||||
return -ENOMEM;
|
||||
memset(pinfo->gpios, -1, ngpios * sizeof(pinfo->gpios));
|
||||
|
||||
pinfo->alow_flags = kzalloc(ngpios * sizeof(pinfo->alow_flags),
|
||||
GFP_KERNEL);
|
||||
if (!pinfo->alow_flags) {
|
||||
ret = -ENOMEM;
|
||||
goto err_alloc_flags;
|
||||
}
|
||||
|
||||
for (; i < ngpios; i++) {
|
||||
int gpio;
|
||||
enum of_gpio_flags flags;
|
||||
|
||||
gpio = of_get_gpio_flags(np, i, &flags);
|
||||
if (!gpio_is_valid(gpio)) {
|
||||
dev_err(dev, "invalid gpio #%d: %d\n", i, gpio);
|
||||
goto err_loop;
|
||||
}
|
||||
|
||||
ret = gpio_request(gpio, dev_name(dev));
|
||||
if (ret) {
|
||||
dev_err(dev, "can't request gpio #%d: %d\n", i, ret);
|
||||
goto err_loop;
|
||||
}
|
||||
|
||||
pinfo->gpios[i] = gpio;
|
||||
pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW;
|
||||
|
||||
ret = gpio_direction_output(pinfo->gpios[i],
|
||||
pinfo->alow_flags[i]);
|
||||
if (ret) {
|
||||
dev_err(dev, "can't set output direction for gpio "
|
||||
"#%d: %d\n", i, ret);
|
||||
goto err_loop;
|
||||
}
|
||||
}
|
||||
|
||||
pdata->max_chipselect = ngpios;
|
||||
pdata->cs_control = mpc83xx_spi_cs_control;
|
||||
|
||||
return 0;
|
||||
|
||||
err_loop:
|
||||
while (i >= 0) {
|
||||
if (gpio_is_valid(pinfo->gpios[i]))
|
||||
gpio_free(pinfo->gpios[i]);
|
||||
i--;
|
||||
}
|
||||
|
||||
kfree(pinfo->alow_flags);
|
||||
pinfo->alow_flags = NULL;
|
||||
err_alloc_flags:
|
||||
kfree(pinfo->gpios);
|
||||
pinfo->gpios = NULL;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int of_mpc83xx_spi_free_chipselects(struct device *dev)
|
||||
{
|
||||
struct fsl_spi_platform_data *pdata = dev->platform_data;
|
||||
struct mpc83xx_spi_probe_info *pinfo = to_of_pinfo(pdata);
|
||||
int i;
|
||||
|
||||
if (!pinfo->gpios)
|
||||
return 0;
|
||||
|
||||
for (i = 0; i < pdata->max_chipselect; i++) {
|
||||
if (gpio_is_valid(pinfo->gpios[i]))
|
||||
gpio_free(pinfo->gpios[i]);
|
||||
}
|
||||
|
||||
kfree(pinfo->gpios);
|
||||
kfree(pinfo->alow_flags);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devinit of_mpc83xx_spi_probe(struct of_device *ofdev,
|
||||
const struct of_device_id *ofid)
|
||||
{
|
||||
struct device *dev = &ofdev->dev;
|
||||
struct device_node *np = ofdev->node;
|
||||
struct mpc83xx_spi_probe_info *pinfo;
|
||||
struct fsl_spi_platform_data *pdata;
|
||||
struct spi_master *master;
|
||||
struct resource mem;
|
||||
struct resource irq;
|
||||
const void *prop;
|
||||
int ret = -ENOMEM;
|
||||
|
||||
pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL);
|
||||
if (!pinfo)
|
||||
return -ENOMEM;
|
||||
|
||||
pdata = &pinfo->pdata;
|
||||
dev->platform_data = pdata;
|
||||
|
||||
/* Allocate bus num dynamically. */
|
||||
pdata->bus_num = -1;
|
||||
|
||||
/* SPI controller is either clocked from QE or SoC clock. */
|
||||
pdata->sysclk = get_brgfreq();
|
||||
if (pdata->sysclk == -1) {
|
||||
pdata->sysclk = fsl_get_sys_freq();
|
||||
if (pdata->sysclk == -1) {
|
||||
ret = -ENODEV;
|
||||
goto err_clk;
|
||||
}
|
||||
}
|
||||
|
||||
prop = of_get_property(np, "mode", NULL);
|
||||
if (prop && !strcmp(prop, "cpu-qe"))
|
||||
pdata->qe_mode = 1;
|
||||
|
||||
ret = of_mpc83xx_spi_get_chipselects(dev);
|
||||
if (ret)
|
||||
goto err;
|
||||
|
||||
ret = of_address_to_resource(np, 0, &mem);
|
||||
if (ret)
|
||||
goto err;
|
||||
|
||||
ret = of_irq_to_resource(np, 0, &irq);
|
||||
if (!ret) {
|
||||
ret = -EINVAL;
|
||||
goto err;
|
||||
}
|
||||
|
||||
master = mpc83xx_spi_probe(dev, &mem, irq.start);
|
||||
if (IS_ERR(master)) {
|
||||
ret = PTR_ERR(master);
|
||||
goto err;
|
||||
}
|
||||
|
||||
of_register_spi_devices(master, np);
|
||||
|
||||
return 0;
|
||||
|
||||
err:
|
||||
of_mpc83xx_spi_free_chipselects(dev);
|
||||
err_clk:
|
||||
kfree(pinfo);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit of_mpc83xx_spi_remove(struct of_device *ofdev)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = mpc83xx_spi_remove(&ofdev->dev);
|
||||
if (ret)
|
||||
return ret;
|
||||
of_mpc83xx_spi_free_chipselects(&ofdev->dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id of_mpc83xx_spi_match[] = {
|
||||
{ .compatible = "fsl,spi" },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, of_mpc83xx_spi_match);
|
||||
|
||||
static struct of_platform_driver of_mpc83xx_spi_driver = {
|
||||
.name = "mpc83xx_spi",
|
||||
.match_table = of_mpc83xx_spi_match,
|
||||
.probe = of_mpc83xx_spi_probe,
|
||||
.remove = __devexit_p(of_mpc83xx_spi_remove),
|
||||
};
|
||||
|
||||
#ifdef CONFIG_MPC832x_RDB
|
||||
/*
|
||||
* XXX XXX XXX
|
||||
* This is "legacy" platform driver, was used by the MPC8323E-RDB boards
|
||||
* only. The driver should go away soon, since newer MPC8323E-RDB's device
|
||||
* tree can work with OpenFirmware driver. But for now we support old trees
|
||||
* as well.
|
||||
*/
|
||||
static int __devinit plat_mpc83xx_spi_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct resource *mem;
|
||||
unsigned int irq;
|
||||
struct spi_master *master;
|
||||
|
||||
if (!pdev->dev.platform_data)
|
||||
return -EINVAL;
|
||||
|
||||
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!mem)
|
||||
return -EINVAL;
|
||||
|
||||
irq = platform_get_irq(pdev, 0);
|
||||
if (!irq)
|
||||
return -EINVAL;
|
||||
|
||||
master = mpc83xx_spi_probe(&pdev->dev, mem, irq);
|
||||
if (IS_ERR(master))
|
||||
return PTR_ERR(master);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devexit plat_mpc83xx_spi_remove(struct platform_device *pdev)
|
||||
{
|
||||
return mpc83xx_spi_remove(&pdev->dev);
|
||||
}
|
||||
|
||||
MODULE_ALIAS("platform:mpc83xx_spi");
|
||||
static struct platform_driver mpc83xx_spi_driver = {
|
||||
.remove = __exit_p(mpc83xx_spi_remove),
|
||||
.probe = plat_mpc83xx_spi_probe,
|
||||
.remove = __exit_p(plat_mpc83xx_spi_remove),
|
||||
.driver = {
|
||||
.name = "mpc83xx_spi",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
};
|
||||
|
||||
static bool legacy_driver_failed;
|
||||
|
||||
static void __init legacy_driver_register(void)
|
||||
{
|
||||
legacy_driver_failed = platform_driver_register(&mpc83xx_spi_driver);
|
||||
}
|
||||
|
||||
static void __exit legacy_driver_unregister(void)
|
||||
{
|
||||
if (legacy_driver_failed)
|
||||
return;
|
||||
platform_driver_unregister(&mpc83xx_spi_driver);
|
||||
}
|
||||
#else
|
||||
static void __init legacy_driver_register(void) {}
|
||||
static void __exit legacy_driver_unregister(void) {}
|
||||
#endif /* CONFIG_MPC832x_RDB */
|
||||
|
||||
static int __init mpc83xx_spi_init(void)
|
||||
{
|
||||
return platform_driver_probe(&mpc83xx_spi_driver, mpc83xx_spi_probe);
|
||||
legacy_driver_register();
|
||||
return of_register_platform_driver(&of_mpc83xx_spi_driver);
|
||||
}
|
||||
|
||||
static void __exit mpc83xx_spi_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&mpc83xx_spi_driver);
|
||||
of_unregister_platform_driver(&of_mpc83xx_spi_driver);
|
||||
legacy_driver_unregister();
|
||||
}
|
||||
|
||||
module_init(mpc83xx_spi_init);
|
||||
|
|
|
|||
|
|
@ -99,7 +99,7 @@ struct spi_device;
|
|||
|
||||
struct fsl_spi_platform_data {
|
||||
u32 initial_spmode; /* initial SPMODE value */
|
||||
u16 bus_num;
|
||||
s16 bus_num;
|
||||
bool qe_mode;
|
||||
/* board specific information */
|
||||
u16 max_chipselect;
|
||||
|
|
|
|||
Loading…
Reference in New Issue