imx: Add gpc power control function

This adds a generic controller function to handle the various
GPC power regions.  For the HB Pulse we use this to power off
both PCIE regions on boot to help return the devices to a sane
state on reboot and sudden power off.

Signed-off-by: Jon Nettleton <jon@solid-run.com>

arch/arm/include/asm/arch-imx8m/sys_proto.h

@@ -12,6 +12,7 @@ void set_wdog_reset(struct wdog_regs *wdog);
 void enable_tzc380(void);
 void restore_boot_params(void);
 int imx8m_usb_power(int usb_id, bool on);
+int imx8m_gpc_power(int id, bool on);
 extern unsigned long rom_pointer[];
 enum boot_device get_boot_device(void);
 bool is_usb_boot(void);

arch/arm/mach-imx/imx8m/soc.c

@@ -236,9 +236,10 @@ void reset_cpu(ulong addr)
 	}
 }
 
-#ifdef CONFIG_USB_XHCI_IMX8M
 #define FSL_SIP_GPC                    0xC2000000
 #define FSL_SIP_CONFIG_GPC_PM_DOMAIN   0x03
+
+#ifdef CONFIG_USB_XHCI_IMX8M
 int imx8m_usb_power(int usb_id, bool on)
 {
 	unsigned long ret;
@@ -254,3 +255,16 @@ int imx8m_usb_power(int usb_id, bool on)
 	return 0;
 }
 #endif
+
+int imx8m_gpc_power(int id, bool on)
+{
+	unsigned long ret;
+
+	ret = call_imx_sip(FSL_SIP_GPC,
+			FSL_SIP_CONFIG_GPC_PM_DOMAIN, id, on, 0);
+	if (ret)
+		return -EPERM;
+
+	return 0;
+}
+

board/solidrun/imx8mq_hb/imx8mq_hb.c

@@ -306,5 +306,8 @@ int board_late_init(void)
 	init_usb_clk(0);
 	init_usb_clk(1);
 
+	imx8m_gpc_power(10, false);
+	imx8m_gpc_power(1, false);
+
 	return 0;
 }