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soc: ti: wkup_m3_ipc: Add support for IO Isolation

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AM43xx support isolation of the IOs so that control is taken
from the peripheral they are connected to and overridden by values
present in the CTRL_CONF_* registers for the pad in the control module.

The actual toggling happens from the wkup_m3, so use a DT property from
the wkup_m3_ipc node to allow the PM code to communicate the necessity
for placing the IOs into isolation to the firmware.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Drew Fustini <dfustini@baylibre.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20220414192722.2978837-3-dfustini@baylibre.com
This commit is contained in:
Dave Gerlach 2022-04-14 12:27:24 -07:00 committed by Nishanth Menon
parent d4c41d32cf
commit 1dcbae86ee
2 changed files with 13 additions and 2 deletions
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14
drivers/soc/ti/wkup_m3_ipc.c
View File

@ -46,6 +46,8 @@
#define IPC_VTT_STAT_MASK (0x1 << 3)
#define IPC_VTT_GPIO_PIN_SHIFT (0x4)
#define IPC_VTT_GPIO_PIN_MASK (0x3f << 4)
#define IPC_IO_ISOLATION_STAT_SHIFT (10)
#define IPC_IO_ISOLATION_STAT_MASK (0x1 << 10)
#define M3_STATE_UNKNOWN 0
#define M3_STATE_RESET 1
@ -228,6 +230,11 @@ static void wkup_m3_set_vtt_gpio(struct wkup_m3_ipc *m3_ipc, int gpio)
(gpio << IPC_VTT_GPIO_PIN_SHIFT);
}
static void wkup_m3_set_io_isolation(struct wkup_m3_ipc *m3_ipc)
{
m3_ipc->isolation_conf = (1 << IPC_IO_ISOLATION_STAT_SHIFT);
}
/* Public functions */
/**
* wkup_m3_set_mem_type - Pass wkup_m3 which type of memory is in use
@ -308,8 +315,8 @@ static int wkup_m3_prepare_low_power(struct wkup_m3_ipc *m3_ipc, int state)
wkup_m3_ctrl_ipc_write(m3_ipc, m3_ipc->resume_addr, 0);
wkup_m3_ctrl_ipc_write(m3_ipc, m3_power_state, 1);
wkup_m3_ctrl_ipc_write(m3_ipc, m3_ipc->mem_type |
m3_ipc->vtt_conf, 4);
m3_ipc->vtt_conf |
m3_ipc->isolation_conf, 4);
wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 2);
wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 3);
wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 5);
@ -516,6 +523,9 @@ static int wkup_m3_ipc_probe(struct platform_device *pdev)
dev_warn(dev, "Invalid VTT GPIO(%d) pin\n", temp);
}
if (of_find_property(np, "ti,set-io-isolation", NULL))
wkup_m3_set_io_isolation(m3_ipc);
/*
* Wait for firmware loading completion in a thread so we
* can boot the wkup_m3 as soon as it's ready without holding

1
include/linux/wkup_m3_ipc.h
View File

@ -34,6 +34,7 @@ struct wkup_m3_ipc {
int mem_type;
unsigned long resume_addr;
int vtt_conf;
int isolation_conf;
int state;
struct completion sync_complete;