netdev - [RFC PATCH 09/10] net: stmmac: dwmac-loongson: Add 64-bit DMA and multi-vector support

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Message-Id: <0249cb14565bcc3e949c349b24df604adc1d5aeb.1689215889.git.chenfeiyang@loongson.cn>
Date: Thu, 13 Jul 2023 10:48:54 +0800
From: Feiyang Chen <chenfeiyang@...ngson.cn>
To: andrew@...n.ch,
	hkallweit1@...il.com,
	peppe.cavallaro@...com,
	alexandre.torgue@...s.st.com,
	joabreu@...opsys.com,
	chenhuacai@...ngson.cn
Cc: Feiyang Chen <chenfeiyang@...ngson.cn>,
	linux@...linux.org.uk,
	dongbiao@...ngson.cn,
	loongson-kernel@...ts.loongnix.cn,
	netdev@...r.kernel.org,
	loongarch@...ts.linux.dev,
	chris.chenfeiyang@...il.com
Subject: [RFC PATCH 09/10] net: stmmac: dwmac-loongson: Add 64-bit DMA and multi-vector support

Set 64-Bit DMA for specific versions. Request allocation for multi-
vector interrupts for DWLGMAC_CORE_1_00. If it fails, fallback to
request allocation for single interrupts.

Signed-off-by: Feiyang Chen <chenfeiyang@...ngson.cn>
---
 .../ethernet/stmicro/stmmac/dwmac-loongson.c  | 53 ++++++++++++++++++-
 1 file changed, 51 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
index dc0916f2e9b8..3732f90a79c7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
@@ -72,11 +72,12 @@ static struct stmmac_pci_info loongson_gmac_pci_info = {
 static int loongson_dwmac_probe(struct pci_dev *pdev,
 				const struct pci_device_id *id)
 {
-	int ret, i, bus_id, phy_mode;
+	int ret, i, bus_id, phy_mode, ch_cnt, vecs;
 	struct plat_stmmacenet_data *plat;
 	struct stmmac_pci_info *info;
 	struct stmmac_resources res;
 	struct device_node *np;
+	u32 version;
 
 	np = dev_of_node(&pdev->dev);
 	if (np && !of_device_is_compatible(np, "loongson, pci-gmac")) {
@@ -173,12 +174,59 @@ static int loongson_dwmac_probe(struct pci_dev *pdev,
 		res.wol_irq = pdev->irq;
 	}
 
+	version = readl(res.addr + GMAC_VERSION);
+	switch (version & 0xff) {
+	case DWLGMAC_CORE_1_00:
+		ch_cnt = 8;
+		plat->multi_msi_en = 1;
+		break;
+
+	case DWMAC_CORE_3_50:
+	case DWMAC_CORE_3_70:
+	default:
+		plat->multi_msi_en = 0;
+		if (version & 0x00008000) {
+			plat->host_dma_width = 64;
+			plat->dma_cfg->dma64 = true;
+		}
+		break;
+	}
+
+	if (plat->multi_msi_en) {
+		plat->rx_queues_to_use = ch_cnt;
+		plat->tx_queues_to_use = ch_cnt;
+
+		pci_disable_msi(pdev);
+
+		res.irq = pci_irq_vector(pdev, 0);
+		res.wol_irq = res.irq;
+		vecs = roundup_pow_of_two(ch_cnt * 2 + 1);
+		if (pci_alloc_irq_vectors(pdev, vecs, vecs, PCI_IRQ_MSI) < 0) {
+			dev_info(&pdev->dev,
+				 "MSI enable failed, Fallback to line interrupt\n");
+			plat->multi_msi_en = 0;
+		} else {
+			/*
+			 * INT NAME | MAC | CH7 rx | CH7 tx | ... | CH0 rx | CH0 tx |
+			 * --------- ----- -------- --------  ...  -------- --------
+			 * IRQ NUM  |  0  |   1    |   2    | ... |   15   |   16   |
+			 */
+			for (i = 0; i < ch_cnt; i++) {
+				res.rx_irq[ch_cnt - 1 - i] = pci_irq_vector(pdev, 1 + i * 2);
+				res.tx_irq[ch_cnt - 1 - i] = pci_irq_vector(pdev, 2 + i * 2);
+			}
+		}
+	}
+
 	ret = stmmac_dvr_probe(&pdev->dev, plat, &res);
 	if (ret)
-		goto err_disable_msi;
+		goto err_free_irq_vectors;
 
 	return ret;
 
+err_free_irq_vectors:
+	if (plat->multi_msi_en)
+		pci_free_irq_vectors(pdev);
 err_disable_msi:
 	pci_disable_msi(pdev);
 err_disable_device:
@@ -204,6 +252,7 @@ static void loongson_dwmac_remove(struct pci_dev *pdev)
 		break;
 	}
 
+	pci_free_irq_vectors(pdev);
 	pci_disable_msi(pdev);
 	pci_disable_device(pdev);
 }
-- 
2.39.3