Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Added erase page. #665

Open
wants to merge 2 commits into
base: master
Choose a base branch
from
Open

Added erase page. #665

Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
965a809
Added erase page.
houwentaoff Mar 22, 2019
0acba08
just style
houwentaoff Mar 28, 2019
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
89 changes: 89 additions & 0 deletions drivers/misc/c2port/core.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -625,7 +625,95 @@ static ssize_t c2port_store_flash_erase(struct device *dev,
return count;
}
static DEVICE_ATTR(flash_erase, 0200, NULL, c2port_store_flash_erase);
static ssize_t __c2port_write_flash_page_erase(struct c2port_device *dev, int block_num)
{
u8 status;
int ret;

/* Target the C2 flash programming data register for C2 data register
* access.
*/
c2port_write_ar(dev, C2PORT_FPDAT);

/* Send device page erase command */
c2port_write_dr(dev, C2PORT_PAGE_ERASE);

/* Wait for input acknowledge */
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;

/* Wait for status information */
ret = c2port_poll_out_ready(dev);
if (ret < 0)
return ret;

/* Read flash programming interface status */
ret = c2port_read_dr(dev, &status);
if (ret < 0)
return ret;
if (status != C2PORT_COMMAND_OK)
return -EBUSY;

c2port_write_dr(dev, block_num&0xff);
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
ret = c2port_poll_out_ready(dev);
if (ret < 0)
return ret;
/* Read flash programming interface status */
ret = c2port_read_dr(dev, &status);
if (ret < 0)
return ret;
if (status != C2PORT_COMMAND_OK)
return -EBUSY;
c2port_write_dr(dev, 0x00);
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
ret = c2port_poll_out_ready(dev);
if (ret < 0)
return ret;
/* Read flash programming interface status */
ret = c2port_read_dr(dev, &status);
if (ret < 0)
return ret;
if (status != C2PORT_COMMAND_OK)
return -EBUSY;

return 0;
}

static ssize_t c2port_store_flash_page_erase(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
struct c2port_ops *ops = c2dev->ops;
houwentaoff marked this conversation as resolved.
Show resolved Hide resolved
int ret;
int block_num;

/* Check the device and flash access status */
if (!c2dev->access || !c2dev->flash_access)
return -EBUSY;

ret = sscanf(buf, "%d", &block_num);
if (ret != 1 || block_num >= ops->blocks_num || block_num < 0)
return -EINVAL;

mutex_lock(&c2dev->mutex);
ret = __c2port_write_flash_page_erase(c2dev, block_num);
mutex_unlock(&c2dev->mutex);

if (ret < 0) {
dev_err(c2dev->dev, "cannot erase the page %d of the %s flash\n", block_num, c2dev->name);
return ret;
}

return count;
}
static DEVICE_ATTR(flash_page_erase, 0200, NULL, c2port_store_flash_page_erase);
static ssize_t __c2port_read_flash_data(struct c2port_device *dev,
char *buffer, loff_t offset, size_t count)
{
Expand Down Expand Up @@ -869,6 +957,7 @@ static struct attribute *c2port_attrs[] = {
&dev_attr_rev_id.attr,
&dev_attr_flash_access.attr,
&dev_attr_flash_erase.attr,
&dev_attr_flash_page_erase.attr,
NULL,
};

Expand Down