mtd: add device-tree support to spear_smi

This patch adds support to configure the SPEAr SMI driver via
device-tree instead of platform_data.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Stefan Roese 2012-03-16 11:42:11 +01:00 committed by David Woodhouse
parent f7e3dd8f48
commit 6551ab5d30
3 changed files with 135 additions and 12 deletions

View file

@ -0,0 +1,31 @@
* SPEAr SMI
Required properties:
- compatible : "st,spear600-smi"
- reg : Address range of the mtd chip
- #address-cells, #size-cells : Must be present if the device has sub-nodes
representing partitions.
- interrupt-parent: Should be the phandle for the interrupt controller
that services interrupts for this device
- interrupts: Should contain the STMMAC interrupts
- clock-rate : Functional clock rate of SMI in Hz
Optional properties:
- st,smi-fast-mode : Flash supports read in fast mode
Example:
smi: flash@fc000000 {
compatible = "st,spear600-smi";
#address-cells = <1>;
#size-cells = <1>;
reg = <0xfc000000 0x1000>;
interrupt-parent = <&vic1>;
interrupts = <12>;
clock-rate = <50000000>; /* 50MHz */
flash@f8000000 {
st,smi-fast-mode;
...
};
};

View file

@ -33,9 +33,8 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/wait.h>
/* max possible slots for serial-nor flash chip in the SMI controller */
#define MAX_NUM_FLASH_CHIP 4
#include <linux/of.h>
#include <linux/of_address.h>
/* SMI clock rate */
#define SMI_MAX_CLOCK_FREQ 50000000 /* 50 MHz */
@ -748,9 +747,63 @@ static int spear_smi_probe_flash(struct spear_smi *dev, u32 bank)
return ret;
}
static int spear_smi_setup_banks(struct platform_device *pdev, u32 bank)
#ifdef CONFIG_OF
static int __devinit spear_smi_probe_config_dt(struct platform_device *pdev,
struct device_node *np)
{
struct spear_smi_plat_data *pdata = dev_get_platdata(&pdev->dev);
struct device_node *pp = NULL;
const __be32 *addr;
u32 val;
int len;
int i = 0;
if (!np)
return -ENODEV;
of_property_read_u32(np, "clock-rate", &val);
pdata->clk_rate = val;
pdata->board_flash_info = devm_kzalloc(&pdev->dev,
sizeof(*pdata->board_flash_info),
GFP_KERNEL);
/* Fill structs for each subnode (flash device) */
while ((pp = of_get_next_child(np, pp))) {
struct spear_smi_flash_info *flash_info;
flash_info = &pdata->board_flash_info[i];
pdata->np[i] = pp;
/* Read base-addr and size from DT */
addr = of_get_property(pp, "reg", &len);
pdata->board_flash_info->mem_base = be32_to_cpup(&addr[0]);
pdata->board_flash_info->size = be32_to_cpup(&addr[1]);
if (of_get_property(pp, "st,smi-fast-mode", NULL))
pdata->board_flash_info->fast_mode = 1;
i++;
}
pdata->num_flashes = i;
return 0;
}
#else
static int __devinit spear_smi_probe_config_dt(struct platform_device *pdev,
struct device_node *np)
{
return -ENOSYS;
}
#endif
static int spear_smi_setup_banks(struct platform_device *pdev,
u32 bank, struct device_node *np)
{
struct spear_smi *dev = platform_get_drvdata(pdev);
struct mtd_part_parser_data ppdata = {};
struct spear_smi_flash_info *flash_info;
struct spear_smi_plat_data *pdata;
struct spear_snor_flash *flash;
@ -816,11 +869,16 @@ static int spear_smi_setup_banks(struct platform_device *pdev, u32 bank)
dev_info(&dev->pdev->dev, ".erasesize = 0x%x(%uK)\n",
flash->mtd.erasesize, flash->mtd.erasesize / 1024);
#ifndef CONFIG_OF
if (flash_info->partitions) {
parts = flash_info->partitions;
count = flash_info->nr_partitions;
}
ret = mtd_device_parse_register(&flash->mtd, NULL, NULL, parts, count);
#endif
ppdata.of_node = np;
ret = mtd_device_parse_register(&flash->mtd, NULL, &ppdata, parts,
count);
if (ret) {
dev_err(&dev->pdev->dev, "Err MTD partition=%d\n", ret);
goto err_map;
@ -847,17 +905,34 @@ static int spear_smi_setup_banks(struct platform_device *pdev, u32 bank)
*/
static int __devinit spear_smi_probe(struct platform_device *pdev)
{
struct spear_smi_plat_data *pdata;
struct device_node *np = pdev->dev.of_node;
struct spear_smi_plat_data *pdata = NULL;
struct spear_smi *dev;
struct resource *smi_base;
int irq, ret = 0;
int i;
pdata = dev_get_platdata(&pdev->dev);
if (pdata < 0) {
ret = -ENODEV;
dev_err(&pdev->dev, "no platform data\n");
goto err;
if (np) {
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
pr_err("%s: ERROR: no memory", __func__);
ret = -ENOMEM;
goto err;
}
pdev->dev.platform_data = pdata;
ret = spear_smi_probe_config_dt(pdev, np);
if (ret) {
ret = -ENODEV;
dev_err(&pdev->dev, "no platform data\n");
goto err;
}
} else {
pdata = dev_get_platdata(&pdev->dev);
if (pdata < 0) {
ret = -ENODEV;
dev_err(&pdev->dev, "no platform data\n");
goto err;
}
}
smi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@ -932,7 +1007,7 @@ static int __devinit spear_smi_probe(struct platform_device *pdev)
/* loop for each serial nor-flash which is connected to smi */
for (i = 0; i < dev->num_flashes; i++) {
ret = spear_smi_setup_banks(pdev, i);
ret = spear_smi_setup_banks(pdev, i, pdata->np[i]);
if (ret) {
dev_err(&dev->pdev->dev, "bank setup failed\n");
goto err_bank_setup;
@ -967,6 +1042,7 @@ static int __devinit spear_smi_probe(struct platform_device *pdev)
static int __devexit spear_smi_remove(struct platform_device *pdev)
{
struct spear_smi *dev;
struct spear_smi_plat_data *pdata;
struct spear_snor_flash *flash;
struct resource *smi_base;
int ret;
@ -978,6 +1054,8 @@ static int __devexit spear_smi_remove(struct platform_device *pdev)
return -ENODEV;
}
pdata = dev_get_platdata(&pdev->dev);
/* clean up for all nor flash */
for (i = 0; i < dev->num_flashes; i++) {
flash = dev->flash[i];
@ -1031,11 +1109,20 @@ int spear_smi_resume(struct platform_device *pdev)
return ret;
}
#ifdef CONFIG_OF
static const struct of_device_id spear_smi_id_table[] = {
{ .compatible = "st,spear600-smi" },
{}
};
MODULE_DEVICE_TABLE(of, spear_smi_id_table);
#endif
static struct platform_driver spear_smi_driver = {
.driver = {
.name = "smi",
.bus = &platform_bus_type,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(spear_smi_id_table),
},
.probe = spear_smi_probe,
.remove = __devexit_p(spear_smi_remove),

View file

@ -14,6 +14,10 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/platform_device.h>
#include <linux/of.h>
/* max possible slots for serial-nor flash chip in the SMI controller */
#define MAX_NUM_FLASH_CHIP 4
/* macro to define partitions for flash devices */
#define DEFINE_PARTS(n, of, s) \
@ -55,6 +59,7 @@ struct spear_smi_plat_data {
unsigned long clk_rate;
int num_flashes;
struct spear_smi_flash_info *board_flash_info;
struct device_node *np[MAX_NUM_FLASH_CHIP];
};
#endif /* __MTD_SPEAR_SMI_H */