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soc: microchip: mpfs: enable access to the system controller's flash

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The system controller has a flash that contains images used to reprogram
the FPGA using IAP (In-Application Programming).
Introduce a function that allows a driver with a reference to the system
controller to get one to a flash device attached to it.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
This commit is contained in:
Conor Dooley 2023-10-20 14:18:40 +01:00
parent 98d62e97c3
commit 742aa6c563
3 changed files with 23 additions and 0 deletions
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1
drivers/soc/microchip/Kconfig
View File

@ -1,6 +1,7 @@
config POLARFIRE_SOC_SYS_CTRL
tristate "POLARFIRE_SOC_SYS_CTRL"
depends on POLARFIRE_SOC_MAILBOX
depends on MTD
help
This driver adds support for the PolarFire SoC (MPFS) system controller.

20
drivers/soc/microchip/mpfs-sys-controller.c
View File

@ -12,6 +12,8 @@
#include <linux/kref.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/mtd/mtd.h>
#include <linux/spi/spi.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/mailbox_client.h>
@ -30,6 +32,7 @@ struct mpfs_sys_controller {
struct mbox_client client;
struct mbox_chan *chan;
struct completion c;
struct mtd_info *flash;
struct kref consumers;
};
@ -99,6 +102,12 @@ static void mpfs_sys_controller_put(void *data)
kref_put(&sys_controller->consumers, mpfs_sys_controller_delete);
}
struct mtd_info *mpfs_sys_controller_get_flash(struct mpfs_sys_controller *mpfs_client)
{
return mpfs_client->flash;
}
EXPORT_SYMBOL(mpfs_sys_controller_get_flash);
static struct platform_device subdevs[] = {
{
.name = "mpfs-rng",
@ -114,12 +123,23 @@ static int mpfs_sys_controller_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mpfs_sys_controller *sys_controller;
struct device_node *np;
int i, ret;
sys_controller = kzalloc(sizeof(*sys_controller), GFP_KERNEL);
if (!sys_controller)
return -ENOMEM;
np = of_parse_phandle(dev->of_node, "microchip,bitstream-flash", 0);
if (!np)
goto no_flash;
sys_controller->flash = of_get_mtd_device_by_node(np);
of_node_put(np);
if (IS_ERR(sys_controller->flash))
return dev_err_probe(dev, PTR_ERR(sys_controller->flash), "Failed to get flash\n");
no_flash:
sys_controller->client.dev = dev;
sys_controller->client.rx_callback = mpfs_sys_controller_rx_callback;
sys_controller->client.tx_block = 1U;

2
include/soc/microchip/mpfs.h
View File

@ -38,6 +38,8 @@ int mpfs_blocking_transaction(struct mpfs_sys_controller *mpfs_client, struct mp
struct mpfs_sys_controller *mpfs_sys_controller_get(struct device *dev);
struct mtd_info *mpfs_sys_controller_get_flash(struct mpfs_sys_controller *mpfs_client);
#endif /* if IS_ENABLED(CONFIG_POLARFIRE_SOC_SYS_CTRL) */
#if IS_ENABLED(CONFIG_MCHP_CLK_MPFS)