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authorHauke Mehrtens <hauke@hauke-m.de>2017-08-20 00:18:15 +0200
committerRalf Baechle <ralf@linux-mips.org>2017-09-04 21:19:02 +0200
commitc20b3b8019823ad8a77c968a702115f735b64a79 (patch)
treeb6c83375d27c4dacaa0335940ce551b987c9345a
parentc5aba1cdd3d31cbf3c8e9d571c9a4db952117970 (diff)
MIPS: lantiq: Convert the fpi bus driver to a platform_driver
Instead of hacking the configuration of the FPI bus into the arch code add an own bus driver for this internal bus. The FPI bus is the main bus of the SoC. This bus driver makes sure the bus is configured correctly before the child drivers are getting initialized. This driver will probably also be used on different SoCs later. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Acked-by: Rob Herring <robh@kernel.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: john@phrozen.org Cc: p.zabel@pengutronix.de Cc: kishon@ti.com Cc: mark.rutland@arm.com Cc: linux-mips@linux-mips.org Cc: linux-mtd@lists.infradead.org Cc: linux-watchdog@vger.kernel.org Cc: devicetree@vger.kernel.org Cc: linux-spi@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/17122/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--Documentation/devicetree/bindings/mips/lantiq/fpi-bus.txt31
-rw-r--r--MAINTAINERS1
-rw-r--r--arch/mips/lantiq/xway/reset.c4
-rw-r--r--arch/mips/lantiq/xway/sysctrl.c41
-rw-r--r--drivers/soc/Makefile1
-rw-r--r--drivers/soc/lantiq/Makefile1
-rw-r--r--drivers/soc/lantiq/fpi-bus.c87
7 files changed, 121 insertions, 45 deletions
diff --git a/Documentation/devicetree/bindings/mips/lantiq/fpi-bus.txt b/Documentation/devicetree/bindings/mips/lantiq/fpi-bus.txt
new file mode 100644
index 000000000000..0a2df4338332
--- /dev/null
+++ b/Documentation/devicetree/bindings/mips/lantiq/fpi-bus.txt
@@ -0,0 +1,31 @@
+Lantiq XWAY SoC FPI BUS binding
+============================
+
+
+-------------------------------------------------------------------------------
+Required properties:
+- compatible : Should be one of
+ "lantiq,xrx200-fpi"
+- reg : The address and length of the XBAR
+ configuration register.
+ Address and length of the FPI bus itself.
+- lantiq,rcu : A phandle to the RCU syscon
+- lantiq,offset-endianness : Offset of the endianness configuration
+ register
+
+-------------------------------------------------------------------------------
+Example for the FPI on the xrx200 SoCs:
+ fpi@10000000 {
+ compatible = "lantiq,xrx200-fpi";
+ ranges = <0x0 0x10000000 0xf000000>;
+ reg = <0x1f400000 0x1000>,
+ <0x10000000 0xf000000>;
+ lantiq,rcu = <&rcu0>;
+ lantiq,offset-endianness = <0x4c>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ gptu@e100a00 {
+ ......
+ };
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index b526acd23ae1..317e72c230ca 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7580,6 +7580,7 @@ M: John Crispin <john@phrozen.org>
L: linux-mips@linux-mips.org
S: Maintained
F: arch/mips/lantiq
+F: drivers/soc/lantiq
LAPB module
L: linux-x25@vger.kernel.org
diff --git a/arch/mips/lantiq/xway/reset.c b/arch/mips/lantiq/xway/reset.c
index 83fd65d76e81..b6752c95a600 100644
--- a/arch/mips/lantiq/xway/reset.c
+++ b/arch/mips/lantiq/xway/reset.c
@@ -373,10 +373,6 @@ static int __init mips_reboot_setup(void)
of_machine_is_compatible("lantiq,vr9"))
ltq_usb_init();
- if (of_machine_is_compatible("lantiq,vr9"))
- ltq_rcu_w32(ltq_rcu_r32(RCU_AHB_ENDIAN) | RCU_VR9_BE_AHB1S,
- RCU_AHB_ENDIAN);
-
_machine_restart = ltq_machine_restart;
_machine_halt = ltq_machine_halt;
pm_power_off = ltq_machine_power_off;
diff --git a/arch/mips/lantiq/xway/sysctrl.c b/arch/mips/lantiq/xway/sysctrl.c
index 95bec460b651..706639a343bc 100644
--- a/arch/mips/lantiq/xway/sysctrl.c
+++ b/arch/mips/lantiq/xway/sysctrl.c
@@ -145,15 +145,7 @@ static u32 pmu_clk_cr_b[] = {
#define pmu_w32(x, y) ltq_w32((x), pmu_membase + (y))
#define pmu_r32(x) ltq_r32(pmu_membase + (x))
-#define XBAR_ALWAYS_LAST 0x430
-#define XBAR_FPI_BURST_EN BIT(1)
-#define XBAR_AHB_BURST_EN BIT(2)
-
-#define xbar_w32(x, y) ltq_w32((x), ltq_xbar_membase + (y))
-#define xbar_r32(x) ltq_r32(ltq_xbar_membase + (x))
-
static void __iomem *pmu_membase;
-static void __iomem *ltq_xbar_membase;
void __iomem *ltq_cgu_membase;
void __iomem *ltq_ebu_membase;
@@ -293,16 +285,6 @@ static void pci_ext_disable(struct clk *clk)
ltq_cgu_w32((1 << 31) | (1 << 30), pcicr);
}
-static void xbar_fpi_burst_disable(void)
-{
- u32 reg;
-
- /* bit 1 as 1 --burst; bit 1 as 0 -- single */
- reg = xbar_r32(XBAR_ALWAYS_LAST);
- reg &= ~XBAR_FPI_BURST_EN;
- xbar_w32(reg, XBAR_ALWAYS_LAST);
-}
-
/* enable a clockout source */
static int clkout_enable(struct clk *clk)
{
@@ -459,26 +441,6 @@ void __init ltq_soc_init(void)
if (!pmu_membase || !ltq_cgu_membase || !ltq_ebu_membase)
panic("Failed to remap core resources");
- if (of_machine_is_compatible("lantiq,vr9")) {
- struct resource res_xbar;
- struct device_node *np_xbar =
- of_find_compatible_node(NULL, NULL,
- "lantiq,xbar-xway");
-
- if (!np_xbar)
- panic("Failed to load xbar nodes from devicetree");
- if (of_address_to_resource(np_xbar, 0, &res_xbar))
- panic("Failed to get xbar resources");
- if (!request_mem_region(res_xbar.start, resource_size(&res_xbar),
- res_xbar.name))
- panic("Failed to get xbar resources");
-
- ltq_xbar_membase = ioremap_nocache(res_xbar.start,
- resource_size(&res_xbar));
- if (!ltq_xbar_membase)
- panic("Failed to remap xbar resources");
- }
-
/* make sure to unprotect the memory region where flash is located */
ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_BUSCON0) & ~EBU_WRDIS, LTQ_EBU_BUSCON0);
@@ -605,7 +567,4 @@ void __init ltq_soc_init(void)
clkdev_add_pmu("1e116000.mei", "dfe", 1, 0, PMU_DFE);
clkdev_add_pmu("1e100400.serial", NULL, 1, 0, PMU_ASC0);
}
-
- if (of_machine_is_compatible("lantiq,vr9"))
- xbar_fpi_burst_disable();
}
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 9241125416ba..f24d95194ced 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_ARCH_DOVE) += dove/
obj-$(CONFIG_MACH_DOVE) += dove/
obj-y += fsl/
obj-$(CONFIG_ARCH_MXC) += imx/
+obj-$(CONFIG_SOC_XWAY) += lantiq/
obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/
obj-$(CONFIG_ARCH_QCOM) += qcom/
obj-y += renesas/
diff --git a/drivers/soc/lantiq/Makefile b/drivers/soc/lantiq/Makefile
new file mode 100644
index 000000000000..35aa86bd1023
--- /dev/null
+++ b/drivers/soc/lantiq/Makefile
@@ -0,0 +1 @@
+obj-y += fpi-bus.o
diff --git a/drivers/soc/lantiq/fpi-bus.c b/drivers/soc/lantiq/fpi-bus.c
new file mode 100644
index 000000000000..a671c9984c4c
--- /dev/null
+++ b/drivers/soc/lantiq/fpi-bus.c
@@ -0,0 +1,87 @@
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Copyright (C) 2011-2015 John Crispin <blogic@phrozen.org>
+ * Copyright (C) 2015 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ * Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de>
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#include <lantiq_soc.h>
+
+#define XBAR_ALWAYS_LAST 0x430
+#define XBAR_FPI_BURST_EN BIT(1)
+#define XBAR_AHB_BURST_EN BIT(2)
+
+#define RCU_VR9_BE_AHB1S 0x00000008
+
+static int ltq_fpi_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct resource *res_xbar;
+ struct regmap *rcu_regmap;
+ void __iomem *xbar_membase;
+ u32 rcu_ahb_endianness_reg_offset;
+ int ret;
+
+ res_xbar = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ xbar_membase = devm_ioremap_resource(dev, res_xbar);
+ if (IS_ERR(xbar_membase))
+ return PTR_ERR(xbar_membase);
+
+ /* RCU configuration is optional */
+ rcu_regmap = syscon_regmap_lookup_by_phandle(np, "lantiq,rcu");
+ if (IS_ERR(rcu_regmap))
+ return PTR_ERR(rcu_regmap);
+
+ ret = device_property_read_u32(dev, "lantiq,offset-endianness",
+ &rcu_ahb_endianness_reg_offset);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to get RCU reg offset\n");
+ return ret;
+ }
+
+ ret = regmap_update_bits(rcu_regmap, rcu_ahb_endianness_reg_offset,
+ RCU_VR9_BE_AHB1S, RCU_VR9_BE_AHB1S);
+ if (ret) {
+ dev_warn(&pdev->dev,
+ "Failed to configure RCU AHB endianness\n");
+ return ret;
+ }
+
+ /* disable fpi burst */
+ ltq_w32_mask(XBAR_FPI_BURST_EN, 0, xbar_membase + XBAR_ALWAYS_LAST);
+
+ return of_platform_populate(dev->of_node, NULL, NULL, dev);
+}
+
+static const struct of_device_id ltq_fpi_match[] = {
+ { .compatible = "lantiq,xrx200-fpi" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ltq_fpi_match);
+
+static struct platform_driver ltq_fpi_driver = {
+ .probe = ltq_fpi_probe,
+ .driver = {
+ .name = "fpi-xway",
+ .of_match_table = ltq_fpi_match,
+ },
+};
+
+module_platform_driver(ltq_fpi_driver);
+
+MODULE_DESCRIPTION("Lantiq FPI bus driver");
+MODULE_LICENSE("GPL");