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Date: Tue, 24 Mar 2020 00:43:02 +0100
From: Marek Vasut <marex@...x.de>
To: netdev@...r.kernel.org
Cc: Marek Vasut <marex@...x.de>,
"David S . Miller" <davem@...emloft.net>,
Lukas Wunner <lukas@...ner.de>, Petr Stetiar <ynezz@...e.cz>,
YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH 13/14] net: ks8851: Implement Parallel bus operations
Implement accessors for KS8851-16MLL/MLLI/MLLU parallel bus variant of
the KS8851. This is based off the ks8851_mll.c , which is a driver for
exactly the same hardware, however the ks8851.c code is much higher
quality. Hence, this patch pulls out the relevant information from the
ks8851_mll.c on how to access the bus, but uses the common ks8851.c
code. To make this patch reviewable, instead of rewriting ks8851_mll.c,
ks8851_mll.c is removed in a separate subsequent patch.
Signed-off-by: Marek Vasut <marex@...x.de>
Cc: David S. Miller <davem@...emloft.net>
Cc: Lukas Wunner <lukas@...ner.de>
Cc: Petr Stetiar <ynezz@...e.cz>
Cc: YueHaibing <yuehaibing@...wei.com>
---
drivers/net/ethernet/micrel/Makefile | 2 +-
drivers/net/ethernet/micrel/ks8851_par.c | 201 +++++++++++++++++++++++
2 files changed, 202 insertions(+), 1 deletion(-)
create mode 100644 drivers/net/ethernet/micrel/ks8851_par.c
diff --git a/drivers/net/ethernet/micrel/Makefile b/drivers/net/ethernet/micrel/Makefile
index bb5c6c53fa02..bff104b15aaa 100644
--- a/drivers/net/ethernet/micrel/Makefile
+++ b/drivers/net/ethernet/micrel/Makefile
@@ -5,5 +5,5 @@
obj-$(CONFIG_KS8842) += ks8842.o
obj-$(CONFIG_KS8851) += ks8851.o ks8851_spi.o
-obj-$(CONFIG_KS8851_MLL) += ks8851_mll.o
+obj-$(CONFIG_KS8851_MLL) += ks8851.o ks8851_par.o
obj-$(CONFIG_KSZ884X_PCI) += ksz884x.o
diff --git a/drivers/net/ethernet/micrel/ks8851_par.c b/drivers/net/ethernet/micrel/ks8851_par.c
new file mode 100644
index 000000000000..2b1be1293c42
--- /dev/null
+++ b/drivers/net/ethernet/micrel/ks8851_par.c
@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* drivers/net/ethernet/micrel/ks8851.c
+ *
+ * Copyright 2009 Simtec Electronics
+ * http://www.simtec.co.uk/
+ * Ben Dooks <ben@...tec.co.uk>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#define DEBUG
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/cache.h>
+#include <linux/crc32.h>
+#include <linux/mii.h>
+#include <linux/eeprom_93cx6.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/of_net.h>
+
+#include "ks8851.h"
+
+#define BE3 0x8000 /* Byte Enable 3 */
+#define BE2 0x4000 /* Byte Enable 2 */
+#define BE1 0x2000 /* Byte Enable 1 */
+#define BE0 0x1000 /* Byte Enable 0 */
+
+/**
+ * struct ks8851_net_par - KS8851 Parallel driver private data
+ * @ks8851: KS8851 driver common private data
+ * @hw_addr : start address of data register.
+ * @hw_addr_cmd : start address of command register.
+ * @cmd_reg_cache : command register cached.
+ */
+struct ks8851_net_par {
+ struct ks8851_net ks8851; /* Must be first */
+ void __iomem *hw_addr;
+ void __iomem *hw_addr_cmd;
+ u16 cmd_reg_cache;
+};
+
+#define to_ks8851_par(ks) container_of((ks), struct ks8851_net_par, ks8851)
+
+/**
+ * ks8851_wrreg16_par - write 16bit register value to chip
+ * @ks: The chip state
+ * @reg: The register address
+ * @val: The value to write
+ *
+ * Issue a write to put the value @val into the register specified in @reg.
+ */
+static void ks8851_wrreg16_par(struct ks8851_net *ks, unsigned int reg,
+ unsigned int val)
+{
+ struct ks8851_net_par *ksp = to_ks8851_par(ks);
+
+ ksp->cmd_reg_cache = (u16)reg | ((BE3 | BE2) >> (reg & 0x02));
+ iowrite16(ksp->cmd_reg_cache, ksp->hw_addr_cmd);
+ iowrite16(val, ksp->hw_addr);
+}
+
+/**
+ * ks8851_rdreg16_par - read 16 bit register from device via SPI
+ * @ks: The chip information
+ * @reg: The register address
+ *
+ * Read a 16bit register from the chip, returning the result
+ */
+static unsigned int ks8851_rdreg16_par(struct ks8851_net *ks, unsigned int reg)
+{
+ struct ks8851_net_par *ksp = to_ks8851_par(ks);
+
+ ksp->cmd_reg_cache = (u16)reg | ((BE3 | BE2) >> (reg & 0x02));
+ iowrite16(ksp->cmd_reg_cache, ksp->hw_addr_cmd);
+ return ioread16(ksp->hw_addr);
+}
+
+/**
+ * ks8851_rdfifo_par - read data from the receive fifo
+ * @ks: The device state.
+ * @buff: The buffer address
+ * @len: The length of the data to read
+ *
+ * Issue an RXQ FIFO read command and read the @len amount of data from
+ * the FIFO into the buffer specified by @buff.
+ */
+static void ks8851_rdfifo_par(struct ks8851_net *ks, u8 *buff, unsigned int len)
+{
+ struct ks8851_net_par *ksp = to_ks8851_par(ks);
+ u16 *wptr = (u16 *)(buff + 2);
+
+ netif_dbg(ks, rx_status, ks->netdev,
+ "%s: %d@%p\n", __func__, len, buff);
+
+ len >>= 1;
+ while (len--)
+ *wptr++ = be16_to_cpu(ioread16(ksp->hw_addr));
+}
+
+/**
+ * ks8851_wrpkt_par - write packet to TX FIFO
+ * @ks: The device state.
+ * @txp: The sk_buff to transmit.
+ * @irq: IRQ on completion of the packet.
+ *
+ * Send the @txp to the chip. This means creating the relevant packet header
+ * specifying the length of the packet and the other information the chip
+ * needs, such as IRQ on completion. Send the header and the packet data to
+ * the device.
+ */
+static void ks8851_wrpkt_par(struct ks8851_net *ks, struct sk_buff *txp,
+ bool irq)
+{
+ struct ks8851_net_par *ksp = to_ks8851_par(ks);
+ unsigned int len = ALIGN(txp->len, 4);
+ u16 *wptr = (u16 *)txp->data;
+ unsigned int fid = 0;
+
+ netif_dbg(ks, tx_queued, ks->netdev, "%s: skb %p, %d@%p, irq %d\n",
+ __func__, txp, txp->len, txp->data, irq);
+
+ fid = ks->fid++;
+ fid &= TXFR_TXFID_MASK;
+
+ if (irq)
+ fid |= TXFR_TXIC; /* irq on completion */
+
+ iowrite16(cpu_to_be16(fid), ksp->hw_addr);
+ iowrite16(cpu_to_be16(txp->len), ksp->hw_addr);
+
+ len >>= 1;
+ while (len--)
+ iowrite16(cpu_to_be16(*wptr++), ksp->hw_addr);
+}
+
+static int ks8851_probe_par(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ks8851_net_par *ksp;
+ struct net_device *ndev;
+ struct ks8851_net *ks;
+
+ ndev = devm_alloc_etherdev(dev, sizeof(struct ks8851_net_par));
+ if (!ndev)
+ return -ENOMEM;
+
+ ks = netdev_priv(ndev);
+ ks->rdreg16 = ks8851_rdreg16_par;
+ ks->wrreg16 = ks8851_wrreg16_par;
+ ks->rdfifo = ks8851_rdfifo_par;
+ ks->wrfifo = ks8851_wrpkt_par;
+
+ ksp = to_ks8851_par(ks);
+
+ ksp->hw_addr = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(ksp->hw_addr))
+ return PTR_ERR(ksp->hw_addr);
+
+ ksp->hw_addr_cmd = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(ksp->hw_addr_cmd))
+ return PTR_ERR(ksp->hw_addr_cmd);
+
+ ndev->irq = platform_get_irq(pdev, 0);
+
+ return ks8851_probe_common(ndev, dev);
+}
+
+static int ks8851_remove_par(struct platform_device *pdev)
+{
+ return ks8851_remove_common(&pdev->dev);
+}
+
+static const struct of_device_id ks8851_match_table[] = {
+ { .compatible = "micrel,ks8851-mll" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ks8851_match_table);
+
+static struct platform_driver ks8851_driver = {
+ .driver = {
+ .name = "ks8851",
+ .of_match_table = ks8851_match_table,
+ .pm = &ks8851_pm_ops,
+ },
+ .probe = ks8851_probe_par,
+ .remove = ks8851_remove_par,
+};
+module_platform_driver(ks8851_driver);
+
+MODULE_DESCRIPTION("KS8851 Network driver");
+MODULE_AUTHOR("Ben Dooks <ben@...tec.co.uk>");
+MODULE_LICENSE("GPL");
--
2.25.1
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