| Message ID | 20170702224051.15109-9-hauke@hauke-m.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Jul 3, 2017 at 1:40 AM, Hauke Mehrtens <hauke@hauke-m.de> wrote: > 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 SoC later. > Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> > Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> > --- > .../devicetree/bindings/mips/lantiq/fpi-bus.txt | 31 ++++++++ > MAINTAINERS | 1 + > arch/mips/lantiq/xway/reset.c | 4 - > arch/mips/lantiq/xway/sysctrl.c | 41 ---------- > drivers/soc/Makefile | 1 + > drivers/soc/lantiq/Makefile | 1 + > drivers/soc/lantiq/fpi-bus.c | 87 ++++++++++++++++++++++ > 7 files changed, 121 insertions(+), 45 deletions(-) > create mode 100644 Documentation/devicetree/bindings/mips/lantiq/fpi-bus.txt > create mode 100644 drivers/soc/lantiq/Makefile > create mode 100644 drivers/soc/lantiq/fpi-bus.c > > 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 09b5ab6a8a5c..5a85d67d8d8a 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -7440,6 +7440,7 @@ 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 824b44281efa..009b5de74a24 100644 > --- a/drivers/soc/Makefile > +++ b/drivers/soc/Makefile > @@ -8,6 +8,7 @@ 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-$(CONFIG_ARCH_RENESAS) += 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"); > -- > 2.11.0 >
On Mon, Jul 03, 2017 at 12:40:43AM +0200, Hauke Mehrtens wrote: > 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 SoC later. > > Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> > --- > .../devicetree/bindings/mips/lantiq/fpi-bus.txt | 31 ++++++++ Acked-by: Rob Herring <robh@kernel.org> > MAINTAINERS | 1 + > arch/mips/lantiq/xway/reset.c | 4 - > arch/mips/lantiq/xway/sysctrl.c | 41 ---------- > drivers/soc/Makefile | 1 + > drivers/soc/lantiq/Makefile | 1 + > drivers/soc/lantiq/fpi-bus.c | 87 ++++++++++++++++++++++ > 7 files changed, 121 insertions(+), 45 deletions(-) > create mode 100644 Documentation/devicetree/bindings/mips/lantiq/fpi-bus.txt > create mode 100644 drivers/soc/lantiq/Makefile > create mode 100644 drivers/soc/lantiq/fpi-bus.c -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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 09b5ab6a8a5c..5a85d67d8d8a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7440,6 +7440,7 @@ 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 824b44281efa..009b5de74a24 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -8,6 +8,7 @@ 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-$(CONFIG_ARCH_QCOM) += qcom/ obj-$(CONFIG_ARCH_RENESAS) += 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");