[3/5] net: stmmac: Add Adaptrum Anarion GMAC glue layer

Submitted by Alexandru Gagniuc on July 28, 2017, 10:07 p.m.

Details

Message ID 20170728220707.13960-4-alex.g@adaptrum.com
State New
Headers show

Commit Message

Alexandru Gagniuc July 28, 2017, 10:07 p.m.
Before the GMAC on the Anarion chip can be used, the PHY interface
selection must be configured with the DWMAC block in reset.

This layer covers a block containing only two registers. Although it
is possible to model this as a reset controller and use the "resets"
property of stmmac, it's much more intuitive to include this in the
glue layer instead.

At this time only RGMII is supported, because it is the only mode
which has been validated hardware-wise.

Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
---
 .../devicetree/bindings/net/anarion-gmac.txt       |  25 ++++
 drivers/net/ethernet/stmicro/stmmac/Kconfig        |   9 ++
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   1 +
 .../net/ethernet/stmicro/stmmac/dwmac-anarion.c    | 151 +++++++++++++++++++++
 4 files changed, 186 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/anarion-gmac.txt
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c

Comments

David Miller July 29, 2017, 2:01 a.m.
From: Alexandru Gagniuc <alex.g@adaptrum.com>
Date: Fri, 28 Jul 2017 15:07:03 -0700

> Before the GMAC on the Anarion chip can be used, the PHY interface
> selection must be configured with the DWMAC block in reset.
> 
> This layer covers a block containing only two registers. Although it
> is possible to model this as a reset controller and use the "resets"
> property of stmmac, it's much more intuitive to include this in the
> glue layer instead.
> 
> At this time only RGMII is supported, because it is the only mode
> which has been validated hardware-wise.
> 
> Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>

I don't see how this fits into any patch series at all.  If this is
part of a series you posted elsewhere, you should keep netdev@ on
all such postings so people there can review the change in-context.

Thanks.
Alexandru Gagniuc July 31, 2017, 3:11 p.m.
Hi David,

On 07/28/2017 07:01 PM, David Miller wrote:
> From: Alexandru Gagniuc <alex.g@adaptrum.com>
> Date: Fri, 28 Jul 2017 15:07:03 -0700
>
>> Before the GMAC on the Anarion chip can be used, the PHY interface
>> selection must be configured with the DWMAC block in reset.
>>
>> This layer covers a block containing only two registers. Although it
>> is possible to model this as a reset controller and use the "resets"
>> property of stmmac, it's much more intuitive to include this in the
>> glue layer instead.
>>
>> At this time only RGMII is supported, because it is the only mode
>> which has been validated hardware-wise.
>>
>> Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
>
> I don't see how this fits into any patch series at all.  If this is
> part of a series you posted elsewhere, you should keep netdev@ on
> all such postings so people there can review the change in-context.

I used the --cc-cmd option to send-email. I'll be sure to CC netdev@ on 
[PATCH v2].

Alex
Rob Herring Aug. 3, 2017, 11:22 p.m.
On Mon, Jul 31, 2017 at 08:11:00AM -0700, Alex wrote:
> Hi David,
> 
> On 07/28/2017 07:01 PM, David Miller wrote:
> > From: Alexandru Gagniuc <alex.g@adaptrum.com>
> > Date: Fri, 28 Jul 2017 15:07:03 -0700
> > 
> > > Before the GMAC on the Anarion chip can be used, the PHY interface
> > > selection must be configured with the DWMAC block in reset.
> > > 
> > > This layer covers a block containing only two registers. Although it
> > > is possible to model this as a reset controller and use the "resets"
> > > property of stmmac, it's much more intuitive to include this in the
> > > glue layer instead.
> > > 
> > > At this time only RGMII is supported, because it is the only mode
> > > which has been validated hardware-wise.
> > > 
> > > Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
> > 
> > I don't see how this fits into any patch series at all.  If this is
> > part of a series you posted elsewhere, you should keep netdev@ on
> > all such postings so people there can review the change in-context.
> 
> I used the --cc-cmd option to send-email. I'll be sure to CC netdev@ on
> [PATCH v2].

The problem is your series spans several subsystems and it's not 
clear who you intend to apply these. There aren't really any hard 
dependencies between the patches, so they could all go thru different 
trees. But you need to state that at least implicitly by sending the 
patches TO who should apply them and CC the rest (and get_maintainers.pl 
doesn't really help with that aspect). Or just don't send them in a 
series if there's not an inter-dependency of the patches. Normally 
bindings and a driver do go together and I'll ack the binding.

Rob
Rob Herring Aug. 3, 2017, 11:26 p.m.
On Fri, Jul 28, 2017 at 03:07:03PM -0700, Alexandru Gagniuc wrote:
> Before the GMAC on the Anarion chip can be used, the PHY interface
> selection must be configured with the DWMAC block in reset.
> 
> This layer covers a block containing only two registers. Although it
> is possible to model this as a reset controller and use the "resets"
> property of stmmac, it's much more intuitive to include this in the
> glue layer instead.
> 
> At this time only RGMII is supported, because it is the only mode
> which has been validated hardware-wise.
> 
> Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
> ---
>  .../devicetree/bindings/net/anarion-gmac.txt       |  25 ++++

The binding looks fine, but please split to separate patch.

>  drivers/net/ethernet/stmicro/stmmac/Kconfig        |   9 ++
>  drivers/net/ethernet/stmicro/stmmac/Makefile       |   1 +
>  .../net/ethernet/stmicro/stmmac/dwmac-anarion.c    | 151 +++++++++++++++++++++
>  4 files changed, 186 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/anarion-gmac.txt
>  create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c

Patch hide | download patch | download mbox

diff --git a/Documentation/devicetree/bindings/net/anarion-gmac.txt b/Documentation/devicetree/bindings/net/anarion-gmac.txt
new file mode 100644
index 0000000..fe67896
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/anarion-gmac.txt
@@ -0,0 +1,25 @@ 
+*  Adaptrum Anarion ethernet controller
+
+This device is a platform glue layer for stmmac.
+Please see stmmac.txt for the other unchanged properties.
+
+Required properties:
+ - compatible:  Should be "adaptrum,anarion-gmac", "snps,dwmac"
+ - phy-mode:    Should be "rgmii". Other modes are not currently supported.
+
+
+Examples:
+
+	gmac1: ethernet@f2014000 {
+		compatible = "adaptrum,anarion-gmac", "snps,dwmac";
+		reg = <0xf2014000 0x4000>, <0xf2018100 8>;
+
+		interrupt-parent = <&core_intc>;
+		interrupts = <21>;
+		interrupt-names = "macirq";
+
+		clocks = <&core_clk>;
+		clock-names = "stmmaceth";
+
+		phy-mode = "rgmii";
+	};
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 85c0e41..9703576 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -45,6 +45,15 @@  config DWMAC_GENERIC
 	  platform specific code to function or is using platform
 	  data for setup.
 
+config DWMAC_ANARION
+	tristate "Adaptrum Anarion GMAC support"
+	default ARC
+	depends on OF && (ARC || COMPILE_TEST)
+	help
+	  Support for Adaptrum Anarion GMAC Ethernet controller.
+
+	  This selects the Anarion SoC glue layer support for the stmmac driver.
+
 config DWMAC_IPQ806X
 	tristate "QCA IPQ806x DWMAC support"
 	default ARCH_QCOM
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index fd4937a..238307f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -7,6 +7,7 @@  stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
 
 # Ordering matters. Generic driver must be last.
 obj-$(CONFIG_STMMAC_PLATFORM)	+= stmmac-platform.o
+obj-$(CONFIG_DWMAC_ANARION)	+= dwmac-anarion.o
 obj-$(CONFIG_DWMAC_IPQ806X)	+= dwmac-ipq806x.o
 obj-$(CONFIG_DWMAC_LPC18XX)	+= dwmac-lpc18xx.o
 obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o dwmac-meson8b.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c
new file mode 100644
index 0000000..6da4d9a
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c
@@ -0,0 +1,151 @@ 
+/*
+ * Adaptrum Anarion DWMAC glue layer
+ *
+ * Copyright (C) 2017, Adaptrum, Inc.
+ * (Written by Alexandru Gagniuc <alex.g at adaptrum.com> for Adaptrum, Inc.)
+ * Licensed under the GPLv2 or (at your option) any later version.
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_net.h>
+#include <linux/stmmac.h>
+
+#include "stmmac.h"
+#include "stmmac_platform.h"
+
+#define GMAC_RESET_CONTROL_REG		0
+#define GMAC_SW_CONFIG_REG		4
+#define  GMAC_CONFIG_INTF_SEL_MASK	(0x7 << 0)
+#define  GMAC_CONFIG_INTF_RGMII		(0x1 << 0)
+
+struct anarion_gmac {
+	uintptr_t ctl_block;
+	uint32_t phy_intf_sel;
+};
+
+static uint32_t gmac_read_reg(struct anarion_gmac *gmac, uint8_t reg)
+{
+	return readl((void *)(gmac->ctl_block + reg));
+};
+
+static void gmac_write_reg(struct anarion_gmac *gmac, uint8_t reg, uint32_t val)
+{
+	writel(val, (void *)(gmac->ctl_block + reg));
+}
+
+static int anarion_gmac_init(struct platform_device *pdev, void *priv)
+{
+	uint32_t sw_config;
+	struct anarion_gmac *gmac = priv;
+
+	/* Reset logic, configure interface mode, then release reset. SIMPLE! */
+	gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1);
+
+	sw_config = gmac_read_reg(gmac, GMAC_SW_CONFIG_REG);
+	sw_config &= ~GMAC_CONFIG_INTF_SEL_MASK;
+	sw_config |= (gmac->phy_intf_sel & GMAC_CONFIG_INTF_SEL_MASK);
+	gmac_write_reg(gmac, GMAC_SW_CONFIG_REG, sw_config);
+
+	gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 0);
+
+	return 0;
+}
+
+static void anarion_gmac_exit(struct platform_device *pdev, void *priv)
+{
+	struct anarion_gmac *gmac = priv;
+
+	gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1);
+}
+
+static struct anarion_gmac *anarion_config_dt(struct platform_device *pdev)
+{
+	int phy_mode;
+	struct resource *res;
+	void __iomem *ctl_block;
+	struct anarion_gmac *gmac;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	ctl_block = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(ctl_block)) {
+		dev_err(&pdev->dev, "Cannot get reset region (%ld)!\n",
+			PTR_ERR(ctl_block));
+		return ctl_block;
+	}
+
+	gmac = devm_kzalloc(&pdev->dev, sizeof(*gmac), GFP_KERNEL);
+	if (!gmac)
+		return ERR_PTR(-ENOMEM);
+
+	gmac->ctl_block = (uintptr_t)ctl_block;
+
+	phy_mode = of_get_phy_mode(pdev->dev.of_node);
+	switch (phy_mode) {
+	case PHY_INTERFACE_MODE_RGMII:		/* Fall through */
+	case PHY_INTERFACE_MODE_RGMII_ID	/* Fall through */:
+	case PHY_INTERFACE_MODE_RGMII_RXID:	/* Fall through */
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		gmac->phy_intf_sel = GMAC_CONFIG_INTF_RGMII;
+		break;
+	default:
+		dev_err(&pdev->dev, "Unsupported phy-mode (%d)\n",
+			phy_mode);
+		return ERR_PTR(-ENOTSUPP);
+	}
+
+	return gmac;
+}
+
+static int anarion_dwmac_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct anarion_gmac *gmac;
+	struct plat_stmmacenet_data *plat_dat;
+	struct stmmac_resources stmmac_res;
+
+	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+	if (ret)
+		return ret;
+
+	gmac = anarion_config_dt(pdev);
+	if (IS_ERR(gmac))
+		return PTR_ERR(gmac);
+
+	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+	if (IS_ERR(plat_dat))
+		return PTR_ERR(plat_dat);
+
+	plat_dat->init = anarion_gmac_init;
+	plat_dat->exit = anarion_gmac_exit;
+	anarion_gmac_init(pdev, gmac);
+
+	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+	if (ret) {
+		stmmac_remove_config_dt(pdev, plat_dat);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id anarion_dwmac_match[] = {
+	{ .compatible = "adaptrum,anarion-gmac" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, anarion_dwmac_match);
+
+static struct platform_driver anarion_dwmac_driver = {
+	.probe  = anarion_dwmac_probe,
+	.remove = stmmac_pltfr_remove,
+	.driver = {
+		.name           = "anarion-dwmac",
+		.pm		= &stmmac_pltfr_pm_ops,
+		.of_match_table = anarion_dwmac_match,
+	},
+};
+module_platform_driver(anarion_dwmac_driver);
+
+MODULE_DESCRIPTION("Adaptrum Anarion DWMAC specific glue layer");
+MODULE_AUTHOR("Alexandru Gagniuc <mr.nuke.me@gmail.com>");
+MODULE_LICENSE("GPL v2");