net: wwan: t7xx: Add core components

Registers the t7xx device driver with the kernel. Setup all the core
components: PCIe layer, Modem Host Cross Core Interface (MHCCIF),
modem control operations, modem state machine, and build
infrastructure.

* PCIe layer code implements driver probe and removal.
* MHCCIF provides interrupt channels to communicate events
  such as handshake, PM and port enumeration.
* Modem control implements the entry point for modem init,
  reset and exit.
* The modem status monitor is a state machine used by modem control
  to complete initialization and stop. It is used also to propagate
  exception events reported by other components.

Signed-off-by: Haijun Liu <haijun.liu@mediatek.com>
Signed-off-by: Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
Co-developed-by: Ricardo Martinez <ricardo.martinez@linux.intel.com>
Signed-off-by: Ricardo Martinez <ricardo.martinez@linux.intel.com>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 225 insertions, 0 deletions

diff --git a/drivers/net/wwan/t7xx/t7xx_pci.c b/drivers/net/wwan/t7xx/t7xx_pci.c
new file mode 100644
index 000000000000..8beb32a4185d
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_pci.c
@@ -0,0 +1,225 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ *  Haijun Liu <haijun.liu@mediatek.com>
+ *  Ricardo Martinez <ricardo.martinez@linux.intel.com>
+ *  Sreehari Kancharla <sreehari.kancharla@intel.com>
+ *
+ * Contributors:
+ *  Amir Hanania <amir.hanania@intel.com>
+ *  Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ *  Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
+ *  Eliot Lee <eliot.lee@intel.com>
+ *  Moises Veleta <moises.veleta@intel.com>
+ */
+
+#include <linux/atomic.h>
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/gfp.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include "t7xx_mhccif.h"
+#include "t7xx_modem_ops.h"
+#include "t7xx_pci.h"
+#include "t7xx_pcie_mac.h"
+#include "t7xx_reg.h"
+
+#define T7XX_PCI_IREG_BASE		0
+#define T7XX_PCI_EREG_BASE		2
+
+static int t7xx_request_irq(struct pci_dev *pdev)
+{
+	struct t7xx_pci_dev *t7xx_dev;
+	int ret, i;
+
+	t7xx_dev = pci_get_drvdata(pdev);
+
+	for (i = 0; i < EXT_INT_NUM; i++) {
+		const char *irq_descr;
+		int irq_vec;
+
+		if (!t7xx_dev->intr_handler[i])
+			continue;
+
+		irq_descr = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_%d",
+					   dev_driver_string(&pdev->dev), i);
+		if (!irq_descr) {
+			ret = -ENOMEM;
+			break;
+		}
+
+		irq_vec = pci_irq_vector(pdev, i);
+		ret = request_threaded_irq(irq_vec, t7xx_dev->intr_handler[i],
+					   t7xx_dev->intr_thread[i], 0, irq_descr,
+					   t7xx_dev->callback_param[i]);
+		if (ret) {
+			dev_err(&pdev->dev, "Failed to request IRQ: %d\n", ret);
+			break;
+		}
+	}
+
+	if (ret) {
+		while (i--) {
+			if (!t7xx_dev->intr_handler[i])
+				continue;
+
+			free_irq(pci_irq_vector(pdev, i), t7xx_dev->callback_param[i]);
+		}
+	}
+
+	return ret;
+}
+
+static int t7xx_setup_msix(struct t7xx_pci_dev *t7xx_dev)
+{
+	struct pci_dev *pdev = t7xx_dev->pdev;
+	int ret;
+
+	/* Only using 6 interrupts, but HW-design requires power-of-2 IRQs allocation */
+	ret = pci_alloc_irq_vectors(pdev, EXT_INT_NUM, EXT_INT_NUM, PCI_IRQ_MSIX);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to allocate MSI-X entry: %d\n", ret);
+		return ret;
+	}
+
+	ret = t7xx_request_irq(pdev);
+	if (ret) {
+		pci_free_irq_vectors(pdev);
+		return ret;
+	}
+
+	t7xx_pcie_set_mac_msix_cfg(t7xx_dev, EXT_INT_NUM);
+	return 0;
+}
+
+static int t7xx_interrupt_init(struct t7xx_pci_dev *t7xx_dev)
+{
+	int ret, i;
+
+	if (!t7xx_dev->pdev->msix_cap)
+		return -EINVAL;
+
+	ret = t7xx_setup_msix(t7xx_dev);
+	if (ret)
+		return ret;
+
+	/* IPs enable interrupts when ready */
+	for (i = 0; i < EXT_INT_NUM; i++)
+		t7xx_pcie_mac_set_int(t7xx_dev, i);
+
+	return 0;
+}
+
+static void t7xx_pci_infracfg_ao_calc(struct t7xx_pci_dev *t7xx_dev)
+{
+	t7xx_dev->base_addr.infracfg_ao_base = t7xx_dev->base_addr.pcie_ext_reg_base +
+					      INFRACFG_AO_DEV_CHIP -
+					      t7xx_dev->base_addr.pcie_dev_reg_trsl_addr;
+}
+
+static int t7xx_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct t7xx_pci_dev *t7xx_dev;
+	int ret;
+
+	t7xx_dev = devm_kzalloc(&pdev->dev, sizeof(*t7xx_dev), GFP_KERNEL);
+	if (!t7xx_dev)
+		return -ENOMEM;
+
+	pci_set_drvdata(pdev, t7xx_dev);
+	t7xx_dev->pdev = pdev;
+
+	ret = pcim_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	pci_set_master(pdev);
+
+	ret = pcim_iomap_regions(pdev, BIT(T7XX_PCI_IREG_BASE) | BIT(T7XX_PCI_EREG_BASE),
+				 pci_name(pdev));
+	if (ret) {
+		dev_err(&pdev->dev, "Could not request BARs: %d\n", ret);
+		return -ENOMEM;
+	}
+
+	ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
+	if (ret) {
+		dev_err(&pdev->dev, "Could not set PCI DMA mask: %d\n", ret);
+		return ret;
+	}
+
+	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
+	if (ret) {
+		dev_err(&pdev->dev, "Could not set consistent PCI DMA mask: %d\n", ret);
+		return ret;
+	}
+
+	IREG_BASE(t7xx_dev) = pcim_iomap_table(pdev)[T7XX_PCI_IREG_BASE];
+	t7xx_dev->base_addr.pcie_ext_reg_base = pcim_iomap_table(pdev)[T7XX_PCI_EREG_BASE];
+
+	t7xx_pcie_mac_atr_init(t7xx_dev);
+	t7xx_pci_infracfg_ao_calc(t7xx_dev);
+	t7xx_mhccif_init(t7xx_dev);
+
+	ret = t7xx_md_init(t7xx_dev);
+	if (ret)
+		return ret;
+
+	t7xx_pcie_mac_interrupts_dis(t7xx_dev);
+
+	ret = t7xx_interrupt_init(t7xx_dev);
+	if (ret) {
+		t7xx_md_exit(t7xx_dev);
+		return ret;
+	}
+
+	t7xx_pcie_mac_set_int(t7xx_dev, MHCCIF_INT);
+	t7xx_pcie_mac_interrupts_en(t7xx_dev);
+
+	return 0;
+}
+
+static void t7xx_pci_remove(struct pci_dev *pdev)
+{
+	struct t7xx_pci_dev *t7xx_dev;
+	int i;
+
+	t7xx_dev = pci_get_drvdata(pdev);
+	t7xx_md_exit(t7xx_dev);
+
+	for (i = 0; i < EXT_INT_NUM; i++) {
+		if (!t7xx_dev->intr_handler[i])
+			continue;
+
+		free_irq(pci_irq_vector(pdev, i), t7xx_dev->callback_param[i]);
+	}
+
+	pci_free_irq_vectors(t7xx_dev->pdev);
+}
+
+static const struct pci_device_id t7xx_pci_table[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_MEDIATEK, 0x4d75) },
+	{ }
+};
+MODULE_DEVICE_TABLE(pci, t7xx_pci_table);
+
+static struct pci_driver t7xx_pci_driver = {
+	.name = "mtk_t7xx",
+	.id_table = t7xx_pci_table,
+	.probe = t7xx_pci_probe,
+	.remove = t7xx_pci_remove,
+};
+
+module_pci_driver(t7xx_pci_driver);
+
+MODULE_AUTHOR("MediaTek Inc");
+MODULE_DESCRIPTION("MediaTek PCIe 5G WWAN modem T7xx driver");
+MODULE_LICENSE("GPL");