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1e22a8c614
We are trying to decompose and decentralize the code in the DB8500 PRCMU out into subdrivers. The code moved in this patch concerns a group of functions used for decoupling and recoupling the IRQs from the GIC. During sleep and idle the Ux500 system will transfer all IRQ handling to the PRCMU using these functions. Basically we are left with the two alternatives of code placement as: - arch/arm/mach-ux500/pm.c - this because the code is closely related to the GIC, and takes ownership of some of the registers from the PRCMU related to this PM functionality. - drivers/mfd/db8500-prcmu-pm.c - because the code is affecting stuff in the PRCMU register range. But then this code needs to remap and handle GIC registers. This patch implementation is taking the first approach. Currently the cpuidle driver is the only piece of code using this set of functions, but it will later also be used by the suspend/resume code which is currently under review. The header file is moved to: <linux/platform_data/arm-ux500-pm.h> The function prototypes need to be placed in a globally visible header since the CPUidle code is planned to move out to drivers/cpuidle. Acked-by: Samuel Ortiz <sameo@linux.intel.com> Acked-by: Rickard Andersson <rickard.andersson@stericsson.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
159 lines
4.0 KiB
C
159 lines
4.0 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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* Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/mfd/dbx500-prcmu.h>
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#include <linux/clksrc-dbx500-prcmu.h>
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#include <linux/sys_soc.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/irq.h>
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#include <linux/irqchip.h>
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#include <linux/irqchip/arm-gic.h>
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#include <linux/platform_data/clk-ux500.h>
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#include <linux/platform_data/arm-ux500-pm.h>
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#include <asm/mach/map.h>
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#include <mach/hardware.h>
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#include <mach/setup.h>
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#include <mach/devices.h>
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#include "board-mop500.h"
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#include "id.h"
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/*
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* FIXME: Should we set up the GPIO domain here?
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*
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* The problem is that we cannot put the interrupt resources into the platform
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* device until the irqdomain has been added. Right now, we set the GIC interrupt
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* domain from init_irq(), then load the gpio driver from
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* core_initcall(nmk_gpio_init) and add the platform devices from
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* arch_initcall(customize_machine).
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*
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* This feels fragile because it depends on the gpio device getting probed
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* _before_ any device uses the gpio interrupts.
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*/
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void __init ux500_init_irq(void)
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{
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void __iomem *dist_base;
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void __iomem *cpu_base;
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gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
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if (cpu_is_u8500_family() || cpu_is_ux540_family()) {
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dist_base = __io_address(U8500_GIC_DIST_BASE);
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cpu_base = __io_address(U8500_GIC_CPU_BASE);
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} else
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ux500_unknown_soc();
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#ifdef CONFIG_OF
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if (of_have_populated_dt())
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irqchip_init();
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else
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#endif
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gic_init(0, 29, dist_base, cpu_base);
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/*
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* Init clocks here so that they are available for system timer
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* initialization.
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*/
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if (cpu_is_u8500_family()) {
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prcmu_early_init(U8500_PRCMU_BASE, SZ_8K - 1);
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ux500_pm_init(U8500_PRCMU_BASE, SZ_8K - 1);
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u8500_clk_init();
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} else if (cpu_is_u9540()) {
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prcmu_early_init(U8500_PRCMU_BASE, SZ_8K - 1);
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ux500_pm_init(U8500_PRCMU_BASE, SZ_8K - 1);
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u8500_clk_init();
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} else if (cpu_is_u8540()) {
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prcmu_early_init(U8500_PRCMU_BASE, SZ_8K + SZ_4K - 1);
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ux500_pm_init(U8500_PRCMU_BASE, SZ_8K + SZ_4K - 1);
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u8540_clk_init();
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}
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}
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void __init ux500_init_late(void)
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{
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mop500_uib_init();
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}
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static const char * __init ux500_get_machine(void)
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{
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return kasprintf(GFP_KERNEL, "DB%4x", dbx500_partnumber());
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}
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static const char * __init ux500_get_family(void)
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{
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return kasprintf(GFP_KERNEL, "ux500");
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}
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static const char * __init ux500_get_revision(void)
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{
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unsigned int rev = dbx500_revision();
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if (rev == 0x01)
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return kasprintf(GFP_KERNEL, "%s", "ED");
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else if (rev >= 0xA0)
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return kasprintf(GFP_KERNEL, "%d.%d",
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(rev >> 4) - 0xA + 1, rev & 0xf);
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return kasprintf(GFP_KERNEL, "%s", "Unknown");
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}
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static ssize_t ux500_get_process(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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if (dbx500_id.process == 0x00)
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return sprintf(buf, "Standard\n");
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return sprintf(buf, "%02xnm\n", dbx500_id.process);
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}
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static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
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const char *soc_id)
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{
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soc_dev_attr->soc_id = soc_id;
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soc_dev_attr->machine = ux500_get_machine();
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soc_dev_attr->family = ux500_get_family();
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soc_dev_attr->revision = ux500_get_revision();
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}
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struct device_attribute ux500_soc_attr =
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__ATTR(process, S_IRUGO, ux500_get_process, NULL);
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struct device * __init ux500_soc_device_init(const char *soc_id)
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{
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struct device *parent;
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struct soc_device *soc_dev;
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struct soc_device_attribute *soc_dev_attr;
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soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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if (!soc_dev_attr)
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return ERR_PTR(-ENOMEM);
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soc_info_populate(soc_dev_attr, soc_id);
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR_OR_NULL(soc_dev)) {
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kfree(soc_dev_attr);
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return NULL;
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}
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parent = soc_device_to_device(soc_dev);
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if (!IS_ERR_OR_NULL(parent))
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device_create_file(parent, &ux500_soc_attr);
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return parent;
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}
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