oxnas: revert to kernel 4.1

A bug resulting in the NAND not being detected by newer kernels has
kept me sleepless for months and yet I wasn't able to discover the
cause.
Bring back patches and files for 4.1 until this has been resolved.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

4 files changed, 62 insertions, 1 deletions

diff --git a/target/linux/oxnas/files/drivers/irqchip/irq-rps.c b/target/linux/oxnas/files/drivers/irqchip/irq-rps.c
index f2b0829de6..1e75ea12be 100644
--- a/target/linux/oxnas/files/drivers/irqchip/irq-rps.c
+++ b/target/linux/oxnas/files/drivers/irqchip/irq-rps.c
@@ -6,7 +6,13 @@
 #include <linux/irqchip/chained_irq.h>
 #include <linux/err.h>
 #include <linux/io.h>
-#include <linux/irqchip.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+# include "irqchip.h"
+#else
+# include <linux/irqchip.h>
+#endif
 
 struct rps_chip_data {
 	void __iomem *base;
@@ -56,7 +62,11 @@ static int rps_irq_domain_xlate(struct irq_domain *d,
 				unsigned long *out_hwirq,
 				unsigned int *out_type)
 {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+	if (d->of_node != controller)
+#else
 	if (irq_domain_get_of_node(d) != controller)
+#endif
 		return -EINVAL;
 	if (intsize < 1)
 		return -EINVAL;
@@ -72,7 +82,11 @@ static int rps_irq_domain_map(struct irq_domain *d, unsigned int irq,
 				irq_hw_number_t hw)
 {
 	irq_set_chip_and_handler(irq, &rps_chip, handle_level_irq);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+	set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+#else
 	irq_set_probe(irq);
+#endif
 	irq_set_chip_data(irq, d->host_data);
 	return 0;
 }
@@ -82,7 +96,11 @@ const struct irq_domain_ops rps_irq_domain_ops = {
 	.xlate = rps_irq_domain_xlate,
 };
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+static void rps_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
+#else
 static void rps_handle_cascade_irq(struct irq_desc *desc)
+#endif
 {
 	struct rps_chip_data *chip_data = irq_desc_get_handler_data(desc);
 	struct irq_chip *chip = irq_desc_get_chip(desc);
@@ -96,7 +114,11 @@ static void rps_handle_cascade_irq(struct irq_desc *desc)
 	cascade_irq = irq_find_mapping(chip_data->domain, rps_irq);
 
 	if (unlikely(rps_irq >= RPS_IRQ_COUNT))
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+		handle_bad_irq(cascade_irq, desc);
+#else
 		handle_bad_irq(desc);
+#endif
 	else
 		generic_handle_irq(cascade_irq);
 
diff --git a/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c b/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c
index c96d66b245..9536e5179c 100644
--- a/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c
+++ b/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c
@@ -56,10 +56,14 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 	return 0;
 }
 
+/* allow users to override the partition in DT using the cmdline */
+static const char * part_probes[] = { "cmdlinepart", "ofpart", NULL };
+
 static struct platform_nand_data oxnas_nand_data = {
 	.chip = {
 		.nr_chips		= 1,
 		.chip_delay		= 30,
+		.part_probe_types	= part_probes,
 	},
 	.ctrl = {
 		.probe		= oxnas_nand_probe,
diff --git a/target/linux/oxnas/files/drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c b/target/linux/oxnas/files/drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c
index aafb118144..07f9f44497 100644
--- a/target/linux/oxnas/files/drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c
+++ b/target/linux/oxnas/files/drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c
@@ -25,6 +25,7 @@
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <linux/stmmac.h>
+#include <linux/version.h>
 
 #include <mach/hardware.h>
 
@@ -91,21 +92,37 @@ static void oxnas_gmac_exit(struct platform_device *pdev, void *priv)
 	}
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+static void *oxnas_gmac_probe(struct platform_device *pdev)
+{
+#else
 static int oxnas_gmac_probe(struct platform_device *pdev)
 {
 	struct plat_stmmacenet_data *plat_dat;
 	struct stmmac_resources stmmac_res;
 	int			ret;
+#endif
 	struct device		*dev = &pdev->dev;
 	struct oxnas_gmac	*bsp_priv;
 
 	bsp_priv = devm_kzalloc(dev, sizeof(*bsp_priv), GFP_KERNEL);
 	if (!bsp_priv)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+		return ERR_PTR(-ENOMEM);
+#else
 		return -ENOMEM;
+#endif
 	bsp_priv->clk = devm_clk_get(dev, "gmac");
 	if (IS_ERR(bsp_priv->clk))
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+		return bsp_priv->clk;
+#else
 		return PTR_ERR(bsp_priv->clk);
+#endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+	return bsp_priv;
+#else
 	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
 	if (ret)
 		return ret;
@@ -123,8 +140,17 @@ static int oxnas_gmac_probe(struct platform_device *pdev)
 		return ret;
 
 	return stmmac_dvr_probe(dev, plat_dat, &stmmac_res);
+#endif
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+const struct stmmac_of_data oxnas_gmac_data = {
+	.has_gmac = 1,
+	.setup = oxnas_gmac_probe,
+	.init = oxnas_gmac_init,
+	.exit = oxnas_gmac_exit,
+};
+#else
 static const struct of_device_id oxnas_gmac_match[] = {
 	{ .compatible = "plxtech,nas782x-gmac" },
 	{ }
@@ -141,5 +167,6 @@ static struct platform_driver oxnas_gmac_driver = {
 	},
 };
 module_platform_driver(oxnas_gmac_driver);
+#endif
 
 MODULE_LICENSE("GPL v2");
diff --git a/target/linux/oxnas/files/drivers/pinctrl/pinctrl-oxnas.c b/target/linux/oxnas/files/drivers/pinctrl/pinctrl-oxnas.c
index 38a8cbb451..034a7304d4 100644
--- a/target/linux/oxnas/files/drivers/pinctrl/pinctrl-oxnas.c
+++ b/target/linux/oxnas/files/drivers/pinctrl/pinctrl-oxnas.c
@@ -27,6 +27,7 @@
 /* Since we request GPIOs from ourself */
 #include <linux/pinctrl/consumer.h>
 #include <linux/spinlock.h>
+#include <linux/version.h>
 
 #include "core.h"
 
@@ -1199,7 +1200,11 @@ static struct irq_chip gpio_irqchip = {
 	.irq_set_type	= gpio_irq_type,
 };
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
+#else
 static void gpio_irq_handler(struct irq_desc *desc)
+#endif
 {
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	struct irq_data *idata = irq_desc_get_irq_data(desc);
@@ -1240,6 +1245,9 @@ static int oxnas_gpio_irq_map(struct irq_domain *h, unsigned int virq,
 	irq_set_lockdep_class(virq, &gpio_lock_class);
 
 	irq_set_chip_and_handler(virq, &gpio_irqchip, handle_edge_irq);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+	set_irq_flags(virq, IRQF_VALID);
+#endif
 	irq_set_chip_data(virq, oxnas_gpio);
 
 	return 0;