mirror of https://github.com/hak5/openwrt-owl.git
477 lines
12 KiB
Diff
477 lines
12 KiB
Diff
From ae6e941c5d58262c0a09c355ae384b7109977053 Mon Sep 17 00:00:00 2001
|
|
From: Lars-Peter Clausen <lars@metafoo.de>
|
|
Date: Mon, 12 Jul 2010 03:48:08 +0200
|
|
Subject: [PATCH] mfd: Add JZ4740 ADC driver
|
|
|
|
This patch adds a MFD driver for the JZ4740 ADC unit. The driver is used to
|
|
demultiplex IRQs and synchronize access to shared registers between the
|
|
battery, hwmon and (future) touchscreen driver.
|
|
|
|
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
|
|
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
|
|
---
|
|
drivers/mfd/Kconfig | 8 +
|
|
drivers/mfd/Makefile | 1 +
|
|
drivers/mfd/jz4740-adc.c | 394 ++++++++++++++++++++++++++++++++++++++++++++
|
|
include/linux/jz4740-adc.h | 32 ++++
|
|
4 files changed, 435 insertions(+), 0 deletions(-)
|
|
create mode 100644 drivers/mfd/jz4740-adc.c
|
|
create mode 100644 include/linux/jz4740-adc.h
|
|
|
|
--- a/drivers/mfd/Kconfig
|
|
+++ b/drivers/mfd/Kconfig
|
|
@@ -482,6 +482,14 @@ config MFD_JANZ_CMODIO
|
|
host many different types of MODULbus daughterboards, including
|
|
CAN and GPIO controllers.
|
|
|
|
+config MFD_JZ4740_ADC
|
|
+ tristate "Support for the JZ4740 SoC ADC core"
|
|
+ select MFD_CORE
|
|
+ depends on MACH_JZ4740
|
|
+ help
|
|
+ Say yes here if you want support for the ADC unit in the JZ4740 SoC.
|
|
+ This driver is necessary for jz4740-battery and jz4740-hwmon driver.
|
|
+
|
|
endif # MFD_SUPPORT
|
|
|
|
menu "Multimedia Capabilities Port drivers"
|
|
--- a/drivers/mfd/Makefile
|
|
+++ b/drivers/mfd/Makefile
|
|
@@ -71,3 +71,4 @@ obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
|
|
obj-$(CONFIG_LPC_SCH) += lpc_sch.o
|
|
obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o
|
|
obj-$(CONFIG_MFD_JANZ_CMODIO) += janz-cmodio.o
|
|
+obj-$(CONFIG_MFD_JZ4740_ADC) += jz4740-adc.o
|
|
--- /dev/null
|
|
+++ b/drivers/mfd/jz4740-adc.c
|
|
@@ -0,0 +1,394 @@
|
|
+/*
|
|
+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
|
|
+ * JZ4740 SoC ADC driver
|
|
+ *
|
|
+ * This program is free software; you can redistribute it and/or modify it
|
|
+ * under the terms of the GNU General Public License as published by the
|
|
+ * Free Software Foundation; either version 2 of the License, or (at your
|
|
+ * option) any later version.
|
|
+ *
|
|
+ * You should have received a copy of the GNU General Public License along
|
|
+ * with this program; if not, write to the Free Software Foundation, Inc.,
|
|
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
+ *
|
|
+ * This driver synchronizes access to the JZ4740 ADC core between the
|
|
+ * JZ4740 battery and hwmon drivers.
|
|
+ */
|
|
+
|
|
+#include <linux/err.h>
|
|
+#include <linux/irq.h>
|
|
+#include <linux/interrupt.h>
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/platform_device.h>
|
|
+#include <linux/slab.h>
|
|
+#include <linux/spinlock.h>
|
|
+
|
|
+#include <linux/clk.h>
|
|
+#include <linux/mfd/core.h>
|
|
+
|
|
+#include <linux/jz4740-adc.h>
|
|
+
|
|
+
|
|
+#define JZ_REG_ADC_ENABLE 0x00
|
|
+#define JZ_REG_ADC_CFG 0x04
|
|
+#define JZ_REG_ADC_CTRL 0x08
|
|
+#define JZ_REG_ADC_STATUS 0x0c
|
|
+
|
|
+#define JZ_REG_ADC_TOUCHSCREEN_BASE 0x10
|
|
+#define JZ_REG_ADC_BATTERY_BASE 0x1c
|
|
+#define JZ_REG_ADC_HWMON_BASE 0x20
|
|
+
|
|
+#define JZ_ADC_ENABLE_TOUCH BIT(2)
|
|
+#define JZ_ADC_ENABLE_BATTERY BIT(1)
|
|
+#define JZ_ADC_ENABLE_ADCIN BIT(0)
|
|
+
|
|
+enum {
|
|
+ JZ_ADC_IRQ_ADCIN = 0,
|
|
+ JZ_ADC_IRQ_BATTERY,
|
|
+ JZ_ADC_IRQ_TOUCH,
|
|
+ JZ_ADC_IRQ_PENUP,
|
|
+ JZ_ADC_IRQ_PENDOWN,
|
|
+};
|
|
+
|
|
+struct jz4740_adc {
|
|
+ struct resource *mem;
|
|
+ void __iomem *base;
|
|
+
|
|
+ int irq;
|
|
+ int irq_base;
|
|
+
|
|
+ struct clk *clk;
|
|
+ atomic_t clk_ref;
|
|
+
|
|
+ spinlock_t lock;
|
|
+};
|
|
+
|
|
+static inline void jz4740_adc_irq_set_masked(struct jz4740_adc *adc, int irq,
|
|
+ bool masked)
|
|
+{
|
|
+ unsigned long flags;
|
|
+ uint8_t val;
|
|
+
|
|
+ irq -= adc->irq_base;
|
|
+
|
|
+ spin_lock_irqsave(&adc->lock, flags);
|
|
+
|
|
+ val = readb(adc->base + JZ_REG_ADC_CTRL);
|
|
+ if (masked)
|
|
+ val |= BIT(irq);
|
|
+ else
|
|
+ val &= ~BIT(irq);
|
|
+ writeb(val, adc->base + JZ_REG_ADC_CTRL);
|
|
+
|
|
+ spin_unlock_irqrestore(&adc->lock, flags);
|
|
+}
|
|
+
|
|
+static void jz4740_adc_irq_mask(unsigned int irq)
|
|
+{
|
|
+ struct jz4740_adc *adc = get_irq_chip_data(irq);
|
|
+ jz4740_adc_irq_set_masked(adc, irq, true);
|
|
+}
|
|
+
|
|
+static void jz4740_adc_irq_unmask(unsigned int irq)
|
|
+{
|
|
+ struct jz4740_adc *adc = get_irq_chip_data(irq);
|
|
+ jz4740_adc_irq_set_masked(adc, irq, false);
|
|
+}
|
|
+
|
|
+static void jz4740_adc_irq_ack(unsigned int irq)
|
|
+{
|
|
+ struct jz4740_adc *adc = get_irq_chip_data(irq);
|
|
+
|
|
+ irq -= adc->irq_base;
|
|
+ writeb(BIT(irq), adc->base + JZ_REG_ADC_STATUS);
|
|
+}
|
|
+
|
|
+static struct irq_chip jz4740_adc_irq_chip = {
|
|
+ .name = "jz4740-adc",
|
|
+ .mask = jz4740_adc_irq_mask,
|
|
+ .unmask = jz4740_adc_irq_unmask,
|
|
+ .ack = jz4740_adc_irq_ack,
|
|
+};
|
|
+
|
|
+static void jz4740_adc_irq_demux(unsigned int irq, struct irq_desc *desc)
|
|
+{
|
|
+ struct jz4740_adc *adc = get_irq_desc_data(desc);
|
|
+ uint8_t status;
|
|
+ unsigned int i;
|
|
+
|
|
+ status = readb(adc->base + JZ_REG_ADC_STATUS);
|
|
+
|
|
+ for (i = 0; i < 5; ++i) {
|
|
+ if (status & BIT(i))
|
|
+ generic_handle_irq(adc->irq_base + i);
|
|
+ }
|
|
+}
|
|
+
|
|
+
|
|
+/* Refcounting for the ADC clock is done in here instead of in the clock
|
|
+ * framework, because it is the only clock which is shared between multiple
|
|
+ * devices and thus is the only clock which needs refcounting */
|
|
+static inline void jz4740_adc_clk_enable(struct jz4740_adc *adc)
|
|
+{
|
|
+ if (atomic_inc_return(&adc->clk_ref) == 1)
|
|
+ clk_enable(adc->clk);
|
|
+}
|
|
+
|
|
+static inline void jz4740_adc_clk_disable(struct jz4740_adc *adc)
|
|
+{
|
|
+ if (atomic_dec_return(&adc->clk_ref) == 0)
|
|
+ clk_disable(adc->clk);
|
|
+}
|
|
+
|
|
+static inline void jz4740_adc_set_enabled(struct jz4740_adc *adc, int engine,
|
|
+ bool enabled)
|
|
+{
|
|
+ unsigned long flags;
|
|
+ uint8_t val;
|
|
+
|
|
+ spin_lock_irqsave(&adc->lock, flags);
|
|
+
|
|
+ val = readb(adc->base + JZ_REG_ADC_ENABLE);
|
|
+ if (enabled)
|
|
+ val |= BIT(engine);
|
|
+ else
|
|
+ val &= BIT(engine);
|
|
+ writeb(val, adc->base + JZ_REG_ADC_ENABLE);
|
|
+
|
|
+ spin_unlock_irqrestore(&adc->lock, flags);
|
|
+}
|
|
+
|
|
+static int jz4740_adc_cell_enable(struct platform_device *pdev)
|
|
+{
|
|
+ struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);
|
|
+
|
|
+ jz4740_adc_clk_enable(adc);
|
|
+ jz4740_adc_set_enabled(adc, pdev->id, true);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int jz4740_adc_cell_disable(struct platform_device *pdev)
|
|
+{
|
|
+ struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);
|
|
+
|
|
+ jz4740_adc_set_enabled(adc, pdev->id, false);
|
|
+ jz4740_adc_clk_disable(adc);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+int jz4740_adc_set_config(struct device *dev, uint32_t mask, uint32_t val)
|
|
+{
|
|
+ struct jz4740_adc *adc = dev_get_drvdata(dev);
|
|
+ unsigned long flags;
|
|
+ uint32_t cfg;
|
|
+
|
|
+ if (!adc)
|
|
+ return -ENODEV;
|
|
+
|
|
+ spin_lock_irqsave(&adc->lock, flags);
|
|
+
|
|
+ cfg = readl(adc->base + JZ_REG_ADC_CFG);
|
|
+
|
|
+ cfg &= ~mask;
|
|
+ cfg |= val;
|
|
+
|
|
+ writel(cfg, adc->base + JZ_REG_ADC_CFG);
|
|
+
|
|
+ spin_unlock_irqrestore(&adc->lock, flags);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+EXPORT_SYMBOL_GPL(jz4740_adc_set_config);
|
|
+
|
|
+static struct resource jz4740_hwmon_resources[] = {
|
|
+ {
|
|
+ .start = JZ_ADC_IRQ_ADCIN,
|
|
+ .flags = IORESOURCE_IRQ,
|
|
+ },
|
|
+ {
|
|
+ .start = JZ_REG_ADC_HWMON_BASE,
|
|
+ .end = JZ_REG_ADC_HWMON_BASE + 3,
|
|
+ .flags = IORESOURCE_MEM,
|
|
+ },
|
|
+};
|
|
+
|
|
+static struct resource jz4740_battery_resources[] = {
|
|
+ {
|
|
+ .start = JZ_ADC_IRQ_BATTERY,
|
|
+ .flags = IORESOURCE_IRQ,
|
|
+ },
|
|
+ {
|
|
+ .start = JZ_REG_ADC_BATTERY_BASE,
|
|
+ .end = JZ_REG_ADC_BATTERY_BASE + 3,
|
|
+ .flags = IORESOURCE_MEM,
|
|
+ },
|
|
+};
|
|
+
|
|
+const struct mfd_cell jz4740_adc_cells[] = {
|
|
+ {
|
|
+ .id = 0,
|
|
+ .name = "jz4740-hwmon",
|
|
+ .num_resources = ARRAY_SIZE(jz4740_hwmon_resources),
|
|
+ .resources = jz4740_hwmon_resources,
|
|
+ .platform_data = (void *)&jz4740_adc_cells[0],
|
|
+ .data_size = sizeof(struct mfd_cell),
|
|
+
|
|
+ .enable = jz4740_adc_cell_enable,
|
|
+ .disable = jz4740_adc_cell_disable,
|
|
+ },
|
|
+ {
|
|
+ .id = 1,
|
|
+ .name = "jz4740-battery",
|
|
+ .num_resources = ARRAY_SIZE(jz4740_battery_resources),
|
|
+ .resources = jz4740_battery_resources,
|
|
+ .platform_data = (void *)&jz4740_adc_cells[1],
|
|
+ .data_size = sizeof(struct mfd_cell),
|
|
+
|
|
+ .enable = jz4740_adc_cell_enable,
|
|
+ .disable = jz4740_adc_cell_disable,
|
|
+ },
|
|
+};
|
|
+
|
|
+static int __devinit jz4740_adc_probe(struct platform_device *pdev)
|
|
+{
|
|
+ int ret;
|
|
+ struct jz4740_adc *adc;
|
|
+ struct resource *mem_base;
|
|
+ int irq;
|
|
+
|
|
+ adc = kmalloc(sizeof(*adc), GFP_KERNEL);
|
|
+ if (!adc) {
|
|
+ dev_err(&pdev->dev, "Failed to allocate driver structure\n");
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+
|
|
+ adc->irq = platform_get_irq(pdev, 0);
|
|
+ if (adc->irq < 0) {
|
|
+ ret = adc->irq;
|
|
+ dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
|
|
+ goto err_free;
|
|
+ }
|
|
+
|
|
+ adc->irq_base = platform_get_irq(pdev, 1);
|
|
+ if (adc->irq_base < 0) {
|
|
+ ret = adc->irq_base;
|
|
+ dev_err(&pdev->dev, "Failed to get irq base: %d\n", ret);
|
|
+ goto err_free;
|
|
+ }
|
|
+
|
|
+ mem_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ if (!mem_base) {
|
|
+ ret = -ENOENT;
|
|
+ dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
|
|
+ goto err_free;
|
|
+ }
|
|
+
|
|
+ /* Only request the shared registers for the MFD driver */
|
|
+ adc->mem = request_mem_region(mem_base->start, JZ_REG_ADC_STATUS,
|
|
+ pdev->name);
|
|
+ if (!adc->mem) {
|
|
+ ret = -EBUSY;
|
|
+ dev_err(&pdev->dev, "Failed to request mmio memory region\n");
|
|
+ goto err_free;
|
|
+ }
|
|
+
|
|
+ adc->base = ioremap_nocache(adc->mem->start, resource_size(adc->mem));
|
|
+ if (!adc->base) {
|
|
+ ret = -EBUSY;
|
|
+ dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
|
|
+ goto err_release_mem_region;
|
|
+ }
|
|
+
|
|
+ adc->clk = clk_get(&pdev->dev, "adc");
|
|
+ if (IS_ERR(adc->clk)) {
|
|
+ ret = PTR_ERR(adc->clk);
|
|
+ dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
|
|
+ goto err_iounmap;
|
|
+ }
|
|
+
|
|
+ spin_lock_init(&adc->lock);
|
|
+ atomic_set(&adc->clk_ref, 0);
|
|
+
|
|
+ platform_set_drvdata(pdev, adc);
|
|
+
|
|
+ for (irq = adc->irq_base; irq < adc->irq_base + 5; ++irq) {
|
|
+ set_irq_chip_data(irq, adc);
|
|
+ set_irq_chip_and_handler(irq, &jz4740_adc_irq_chip,
|
|
+ handle_level_irq);
|
|
+ }
|
|
+
|
|
+ set_irq_data(adc->irq, adc);
|
|
+ set_irq_chained_handler(adc->irq, jz4740_adc_irq_demux);
|
|
+
|
|
+ writeb(0x00, adc->base + JZ_REG_ADC_ENABLE);
|
|
+ writeb(0xff, adc->base + JZ_REG_ADC_CTRL);
|
|
+
|
|
+ ret = mfd_add_devices(&pdev->dev, 0, jz4740_adc_cells,
|
|
+ ARRAY_SIZE(jz4740_adc_cells), mem_base, adc->irq_base);
|
|
+ if (ret < 0)
|
|
+ goto err_clk_put;
|
|
+
|
|
+ return 0;
|
|
+
|
|
+err_clk_put:
|
|
+ clk_put(adc->clk);
|
|
+err_iounmap:
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+ iounmap(adc->base);
|
|
+err_release_mem_region:
|
|
+ release_mem_region(adc->mem->start, resource_size(adc->mem));
|
|
+err_free:
|
|
+ kfree(adc);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int __devexit jz4740_adc_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct jz4740_adc *adc = platform_get_drvdata(pdev);
|
|
+
|
|
+ mfd_remove_devices(&pdev->dev);
|
|
+
|
|
+ set_irq_data(adc->irq, NULL);
|
|
+ set_irq_chained_handler(adc->irq, NULL);
|
|
+
|
|
+ iounmap(adc->base);
|
|
+ release_mem_region(adc->mem->start, resource_size(adc->mem));
|
|
+
|
|
+ clk_put(adc->clk);
|
|
+
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+
|
|
+ kfree(adc);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+struct platform_driver jz4740_adc_driver = {
|
|
+ .probe = jz4740_adc_probe,
|
|
+ .remove = __devexit_p(jz4740_adc_remove),
|
|
+ .driver = {
|
|
+ .name = "jz4740-adc",
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+};
|
|
+
|
|
+static int __init jz4740_adc_init(void)
|
|
+{
|
|
+ return platform_driver_register(&jz4740_adc_driver);
|
|
+}
|
|
+module_init(jz4740_adc_init);
|
|
+
|
|
+static void __exit jz4740_adc_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&jz4740_adc_driver);
|
|
+}
|
|
+module_exit(jz4740_adc_exit);
|
|
+
|
|
+MODULE_DESCRIPTION("JZ4740 SoC ADC driver");
|
|
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_ALIAS("platform:jz4740-adc");
|
|
--- /dev/null
|
|
+++ b/include/linux/jz4740-adc.h
|
|
@@ -0,0 +1,32 @@
|
|
+
|
|
+#ifndef __LINUX_JZ4740_ADC
|
|
+#define __LINUX_JZ4740_ADC
|
|
+
|
|
+#include <linux/device.h>
|
|
+
|
|
+/*
|
|
+ * jz4740_adc_set_config - Configure a JZ4740 adc device
|
|
+ * @dev: Pointer to a jz4740-adc device
|
|
+ * @mask: Mask for the config value to be set
|
|
+ * @val: Value to be set
|
|
+ *
|
|
+ * This function can be used by the JZ4740 ADC mfd cells to configure their
|
|
+ * options in the shared config register.
|
|
+*/
|
|
+int jz4740_adc_set_config(struct device *dev, uint32_t mask, uint32_t val);
|
|
+
|
|
+#define JZ_ADC_CONFIG_SPZZ BIT(31)
|
|
+#define JZ_ADC_CONFIG_EX_IN BIT(30)
|
|
+#define JZ_ADC_CONFIG_DNUM_MASK (0x7 << 16)
|
|
+#define JZ_ADC_CONFIG_DMA_ENABLE BIT(15)
|
|
+#define JZ_ADC_CONFIG_XYZ_MASK (0x2 << 13)
|
|
+#define JZ_ADC_CONFIG_SAMPLE_NUM_MASK (0x7 << 10)
|
|
+#define JZ_ADC_CONFIG_CLKDIV_MASK (0xf << 5)
|
|
+#define JZ_ADC_CONFIG_BAT_MB BIT(4)
|
|
+
|
|
+#define JZ_ADC_CONFIG_DNUM(dnum) ((dnum) << 16)
|
|
+#define JZ_ADC_CONFIG_XYZ_OFFSET(dnum) ((xyz) << 13)
|
|
+#define JZ_ADC_CONFIG_SAMPLE_NUM(x) ((x) << 10)
|
|
+#define JZ_ADC_CONFIG_CLKDIV(div) ((div) << 5)
|
|
+
|
|
+#endif
|