Commit 742aa6c5 authored by Conor Dooley's avatar Conor Dooley
Browse files

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



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: default avatarConor Dooley <conor.dooley@microchip.com>
parent 98d62e97

drivers/soc/microchip/Kconfig

+1 −0
Original line number Diff line number Diff line 
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.

drivers/soc/microchip/mpfs-sys-controller.c

+20 −0
Original line number Diff line number Diff line
@@ -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;

include/soc/microchip/mpfs.h

+2 −0
Original line number Diff line number Diff line
@@ -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)