bus: mhi: pci_generic: Introduce Sierra EM919X support

Add support for EM919X modems, this modem series is based on SDX55
qcom chip.

It is mandatory to use the same ring for control+data and diag events.

Link: https://lore.kernel.org/r/20211123081541.648426-1-thomas.perrot@bootlin.comTested-by: Aleksander Morgado <aleksander@aleksander.es>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Thomas Perrot <thomas.perrot@bootlin.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20211216081227.237749-11-manivannan.sadhasivam@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/bus/mhi/pci_generic.c

@@ -403,7 +403,50 @@ static const struct mhi_pci_dev_info mhi_mv31_info = {
 	.dma_data_width = 32,
 };
 
+static const struct mhi_channel_config mhi_sierra_em919x_channels[] = {
+	MHI_CHANNEL_CONFIG_UL_SBL(2, "SAHARA", 32, 0),
+	MHI_CHANNEL_CONFIG_DL_SBL(3, "SAHARA", 256, 0),
+	MHI_CHANNEL_CONFIG_UL(4, "DIAG", 32, 0),
+	MHI_CHANNEL_CONFIG_DL(5, "DIAG", 32, 0),
+	MHI_CHANNEL_CONFIG_UL(12, "MBIM", 128, 0),
+	MHI_CHANNEL_CONFIG_DL(13, "MBIM", 128, 0),
+	MHI_CHANNEL_CONFIG_UL(14, "QMI", 32, 0),
+	MHI_CHANNEL_CONFIG_DL(15, "QMI", 32, 0),
+	MHI_CHANNEL_CONFIG_UL(32, "DUN", 32, 0),
+	MHI_CHANNEL_CONFIG_DL(33, "DUN", 32, 0),
+	MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0", 512, 1),
+	MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0", 512, 2),
+};
+
+static struct mhi_event_config modem_sierra_em919x_mhi_events[] = {
+	/* first ring is control+data and DIAG ring */
+	MHI_EVENT_CONFIG_CTRL(0, 2048),
+	/* Hardware channels request dedicated hardware event rings */
+	MHI_EVENT_CONFIG_HW_DATA(1, 2048, 100),
+	MHI_EVENT_CONFIG_HW_DATA(2, 2048, 101)
+};
+
+static const struct mhi_controller_config modem_sierra_em919x_config = {
+	.max_channels = 128,
+	.timeout_ms = 24000,
+	.num_channels = ARRAY_SIZE(mhi_sierra_em919x_channels),
+	.ch_cfg = mhi_sierra_em919x_channels,
+	.num_events = ARRAY_SIZE(modem_sierra_em919x_mhi_events),
+	.event_cfg = modem_sierra_em919x_mhi_events,
+};
+
+static const struct mhi_pci_dev_info mhi_sierra_em919x_info = {
+	.name = "sierra-em919x",
+	.config = &modem_sierra_em919x_config,
+	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
+	.dma_data_width = 32,
+	.sideband_wake = false,
+};
+
 static const struct pci_device_id mhi_pci_id_table[] = {
+	/* EM919x (sdx55), use the same vid:pid as qcom-sdx55m */
+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x0306, 0x18d7, 0x0200),
+		.driver_data = (kernel_ulong_t) &mhi_sierra_em919x_info },
 	{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0306),
 		.driver_data = (kernel_ulong_t) &mhi_qcom_sdx55_info },
 	{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0304),