diff options
Diffstat (limited to 'target/linux/lantiq/patches-2.6.39/0008-MIPS-Lantiq-Add-more-gpio-drivers.patch')
| -rw-r--r-- | target/linux/lantiq/patches-2.6.39/0008-MIPS-Lantiq-Add-more-gpio-drivers.patch | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-2.6.39/0008-MIPS-Lantiq-Add-more-gpio-drivers.patch b/target/linux/lantiq/patches-2.6.39/0008-MIPS-Lantiq-Add-more-gpio-drivers.patch new file mode 100644 index 0000000000..2daa9e0fe2 --- /dev/null +++ b/target/linux/lantiq/patches-2.6.39/0008-MIPS-Lantiq-Add-more-gpio-drivers.patch @@ -0,0 +1,330 @@ +From f9391211e47cdcc31f341d710efef4b3b46c333d Mon Sep 17 00:00:00 2001 +From: John Crispin <blogic@openwrt.org> +Date: Wed, 30 Mar 2011 09:27:56 +0200 +Subject: [PATCH 08/13] MIPS: Lantiq: Add more gpio drivers + +The XWAY family allows to extend the number of gpios by using shift registers or latches. This patch adds the 2 drivers needed for this. The extended gpios are output only. + +[ralf@linux-mips.org: Fixed ltq_stp_probe section() attributes.] + +Signed-off-by: John Crispin <blogic@openwrt.org> +Signed-off-by: Ralph Hempel <ralph.hempel@lantiq.com> +Cc: linux-mips@linux-mips.org +Patchwork: https://patchwork.linux-mips.org/patch/2258/ +Signed-off-by: Ralf Baechle <ralf@linux-mips.org> +--- + arch/mips/lantiq/xway/Makefile | 2 +- + arch/mips/lantiq/xway/gpio_ebu.c | 126 ++++++++++++++++++++++++++++++ + arch/mips/lantiq/xway/gpio_stp.c | 157 ++++++++++++++++++++++++++++++++++++++ + 3 files changed, 284 insertions(+), 1 deletions(-) + create mode 100644 arch/mips/lantiq/xway/gpio_ebu.c + create mode 100644 arch/mips/lantiq/xway/gpio_stp.c + +diff --git a/arch/mips/lantiq/xway/Makefile b/arch/mips/lantiq/xway/Makefile +index b1d3640..6b5e07e 100644 +--- a/arch/mips/lantiq/xway/Makefile ++++ b/arch/mips/lantiq/xway/Makefile +@@ -1,4 +1,4 @@ +-obj-y := pmu.o ebu.o reset.o gpio.o devices.o ++obj-y := pmu.o ebu.o reset.o gpio.o gpio_stp.o gpio_ebu.o devices.o + + obj-$(CONFIG_SOC_XWAY) += clk-xway.o prom-xway.o setup-xway.o + obj-$(CONFIG_SOC_AMAZON_SE) += clk-ase.o prom-ase.o setup-ase.o +diff --git a/arch/mips/lantiq/xway/gpio_ebu.c b/arch/mips/lantiq/xway/gpio_ebu.c +new file mode 100644 +index 0000000..a479355 +--- /dev/null ++++ b/arch/mips/lantiq/xway/gpio_ebu.c +@@ -0,0 +1,126 @@ ++/* ++ * 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) 2010 John Crispin <blogic@openwrt.org> ++ */ ++ ++#include <linux/init.h> ++#include <linux/module.h> ++#include <linux/types.h> ++#include <linux/platform_device.h> ++#include <linux/mutex.h> ++#include <linux/gpio.h> ++#include <linux/io.h> ++ ++#include <lantiq_soc.h> ++ ++/* ++ * By attaching hardware latches to the EBU it is possible to create output ++ * only gpios. This driver configures a special memory address, which when ++ * written to outputs 16 bit to the latches. ++ */ ++ ++#define LTQ_EBU_BUSCON 0x1e7ff /* 16 bit access, slowest timing */ ++#define LTQ_EBU_WP 0x80000000 /* write protect bit */ ++ ++/* we keep a shadow value of the last value written to the ebu */ ++static int ltq_ebu_gpio_shadow = 0x0; ++static void __iomem *ltq_ebu_gpio_membase; ++ ++static void ltq_ebu_apply(void) ++{ ++ unsigned long flags; ++ ++ spin_lock_irqsave(&ebu_lock, flags); ++ ltq_ebu_w32(LTQ_EBU_BUSCON, LTQ_EBU_BUSCON1); ++ *((__u16 *)ltq_ebu_gpio_membase) = ltq_ebu_gpio_shadow; ++ ltq_ebu_w32(LTQ_EBU_BUSCON | LTQ_EBU_WP, LTQ_EBU_BUSCON1); ++ spin_unlock_irqrestore(&ebu_lock, flags); ++} ++ ++static void ltq_ebu_set(struct gpio_chip *chip, unsigned offset, int value) ++{ ++ if (value) ++ ltq_ebu_gpio_shadow |= (1 << offset); ++ else ++ ltq_ebu_gpio_shadow &= ~(1 << offset); ++ ltq_ebu_apply(); ++} ++ ++static int ltq_ebu_direction_output(struct gpio_chip *chip, unsigned offset, ++ int value) ++{ ++ ltq_ebu_set(chip, offset, value); ++ ++ return 0; ++} ++ ++static struct gpio_chip ltq_ebu_chip = { ++ .label = "ltq_ebu", ++ .direction_output = ltq_ebu_direction_output, ++ .set = ltq_ebu_set, ++ .base = 72, ++ .ngpio = 16, ++ .can_sleep = 1, ++ .owner = THIS_MODULE, ++}; ++ ++static int ltq_ebu_probe(struct platform_device *pdev) ++{ ++ int ret = 0; ++ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ ++ if (!res) { ++ dev_err(&pdev->dev, "failed to get memory resource\n"); ++ return -ENOENT; ++ } ++ ++ res = devm_request_mem_region(&pdev->dev, res->start, ++ resource_size(res), dev_name(&pdev->dev)); ++ if (!res) { ++ dev_err(&pdev->dev, "failed to request memory resource\n"); ++ return -EBUSY; ++ } ++ ++ ltq_ebu_gpio_membase = devm_ioremap_nocache(&pdev->dev, res->start, ++ resource_size(res)); ++ if (!ltq_ebu_gpio_membase) { ++ dev_err(&pdev->dev, "Failed to ioremap mem region\n"); ++ return -ENOMEM; ++ } ++ ++ /* grab the default shadow value passed form the platform code */ ++ ltq_ebu_gpio_shadow = (unsigned int) pdev->dev.platform_data; ++ ++ /* tell the ebu controller which memory address we will be using */ ++ ltq_ebu_w32(pdev->resource->start | 0x1, LTQ_EBU_ADDRSEL1); ++ ++ /* write protect the region */ ++ ltq_ebu_w32(LTQ_EBU_BUSCON | LTQ_EBU_WP, LTQ_EBU_BUSCON1); ++ ++ ret = gpiochip_add(<q_ebu_chip); ++ if (!ret) ++ ltq_ebu_apply(); ++ return ret; ++} ++ ++static struct platform_driver ltq_ebu_driver = { ++ .probe = ltq_ebu_probe, ++ .driver = { ++ .name = "ltq_ebu", ++ .owner = THIS_MODULE, ++ }, ++}; ++ ++static int __init ltq_ebu_init(void) ++{ ++ int ret = platform_driver_register(<q_ebu_driver); ++ ++ if (ret) ++ pr_info("ltq_ebu : Error registering platfom driver!"); ++ return ret; ++} ++ ++postcore_initcall(ltq_ebu_init); +diff --git a/arch/mips/lantiq/xway/gpio_stp.c b/arch/mips/lantiq/xway/gpio_stp.c +new file mode 100644 +index 0000000..67d59d6 +--- /dev/null ++++ b/arch/mips/lantiq/xway/gpio_stp.c +@@ -0,0 +1,157 @@ ++/* ++ * 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) 2007 John Crispin <blogic@openwrt.org> ++ * ++ */ ++ ++#include <linux/slab.h> ++#include <linux/init.h> ++#include <linux/module.h> ++#include <linux/types.h> ++#include <linux/platform_device.h> ++#include <linux/mutex.h> ++#include <linux/io.h> ++#include <linux/gpio.h> ++ ++#include <lantiq_soc.h> ++ ++#define LTQ_STP_CON0 0x00 ++#define LTQ_STP_CON1 0x04 ++#define LTQ_STP_CPU0 0x08 ++#define LTQ_STP_CPU1 0x0C ++#define LTQ_STP_AR 0x10 ++ ++#define LTQ_STP_CON_SWU (1 << 31) ++#define LTQ_STP_2HZ 0 ++#define LTQ_STP_4HZ (1 << 23) ++#define LTQ_STP_8HZ (2 << 23) ++#define LTQ_STP_10HZ (3 << 23) ++#define LTQ_STP_SPEED_MASK (0xf << 23) ++#define LTQ_STP_UPD_FPI (1 << 31) ++#define LTQ_STP_UPD_MASK (3 << 30) ++#define LTQ_STP_ADSL_SRC (3 << 24) ++ ++#define LTQ_STP_GROUP0 (1 << 0) ++ ++#define LTQ_STP_RISING 0 ++#define LTQ_STP_FALLING (1 << 26) ++#define LTQ_STP_EDGE_MASK (1 << 26) ++ ++#define ltq_stp_r32(reg) __raw_readl(ltq_stp_membase + reg) ++#define ltq_stp_w32(val, reg) __raw_writel(val, ltq_stp_membase + reg) ++#define ltq_stp_w32_mask(clear, set, reg) \ ++ ltq_w32((ltq_r32(ltq_stp_membase + reg) & ~(clear)) | (set), \ ++ ltq_stp_membase + (reg)) ++ ++static int ltq_stp_shadow = 0xffff; ++static void __iomem *ltq_stp_membase; ++ ++static void ltq_stp_set(struct gpio_chip *chip, unsigned offset, int value) ++{ ++ if (value) ++ ltq_stp_shadow |= (1 << offset); ++ else ++ ltq_stp_shadow &= ~(1 << offset); ++ ltq_stp_w32(ltq_stp_shadow, LTQ_STP_CPU0); ++} ++ ++static int ltq_stp_direction_output(struct gpio_chip *chip, unsigned offset, ++ int value) ++{ ++ ltq_stp_set(chip, offset, value); ++ ++ return 0; ++} ++ ++static struct gpio_chip ltq_stp_chip = { ++ .label = "ltq_stp", ++ .direction_output = ltq_stp_direction_output, ++ .set = ltq_stp_set, ++ .base = 48, ++ .ngpio = 24, ++ .can_sleep = 1, ++ .owner = THIS_MODULE, ++}; ++ ++static int ltq_stp_hw_init(void) ++{ ++ /* the 3 pins used to control the external stp */ ++ ltq_gpio_request(4, 1, 0, 1, "stp-st"); ++ ltq_gpio_request(5, 1, 0, 1, "stp-d"); ++ ltq_gpio_request(6, 1, 0, 1, "stp-sh"); ++ ++ /* sane defaults */ ++ ltq_stp_w32(0, LTQ_STP_AR); ++ ltq_stp_w32(0, LTQ_STP_CPU0); ++ ltq_stp_w32(0, LTQ_STP_CPU1); ++ ltq_stp_w32(LTQ_STP_CON_SWU, LTQ_STP_CON0); ++ ltq_stp_w32(0, LTQ_STP_CON1); ++ ++ /* rising or falling edge */ ++ ltq_stp_w32_mask(LTQ_STP_EDGE_MASK, LTQ_STP_FALLING, LTQ_STP_CON0); ++ ++ /* per default stp 15-0 are set */ ++ ltq_stp_w32_mask(0, LTQ_STP_GROUP0, LTQ_STP_CON1); ++ ++ /* stp are update periodically by the FPI bus */ ++ ltq_stp_w32_mask(LTQ_STP_UPD_MASK, LTQ_STP_UPD_FPI, LTQ_STP_CON1); ++ ++ /* set stp update speed */ ++ ltq_stp_w32_mask(LTQ_STP_SPEED_MASK, LTQ_STP_8HZ, LTQ_STP_CON1); ++ ++ /* tell the hardware that pin (led) 0 and 1 are controlled ++ * by the dsl arc ++ */ ++ ltq_stp_w32_mask(0, LTQ_STP_ADSL_SRC, LTQ_STP_CON0); ++ ++ ltq_pmu_enable(PMU_LED); ++ return 0; ++} ++ ++static int __devinit ltq_stp_probe(struct platform_device *pdev) ++{ ++ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ int ret = 0; ++ ++ if (!res) ++ return -ENOENT; ++ res = devm_request_mem_region(&pdev->dev, res->start, ++ resource_size(res), dev_name(&pdev->dev)); ++ if (!res) { ++ dev_err(&pdev->dev, "failed to request STP memory\n"); ++ return -EBUSY; ++ } ++ ltq_stp_membase = devm_ioremap_nocache(&pdev->dev, res->start, ++ resource_size(res)); ++ if (!ltq_stp_membase) { ++ dev_err(&pdev->dev, "failed to remap STP memory\n"); ++ return -ENOMEM; ++ } ++ ret = gpiochip_add(<q_stp_chip); ++ if (!ret) ++ ret = ltq_stp_hw_init(); ++ ++ return ret; ++} ++ ++static struct platform_driver ltq_stp_driver = { ++ .probe = ltq_stp_probe, ++ .driver = { ++ .name = "ltq_stp", ++ .owner = THIS_MODULE, ++ }, ++}; ++ ++int __init ltq_stp_init(void) ++{ ++ int ret = platform_driver_register(<q_stp_driver); ++ ++ if (ret) ++ pr_info("ltq_stp: error registering platfom driver"); ++ return ret; ++} ++ ++postcore_initcall(ltq_stp_init); +-- +1.7.2.3 + |