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![Paul Gortmaker](/assets/img/avatar_default.png)
Historically a lot of these existed because we did not have a distinction between what was modular code and what was providing support to modules via EXPORT_SYMBOL and friends. That changed when we forked out support for the latter into the export.h file. This means we should be able to reduce the usage of module.h in code that is obj-y Makefile or bool Kconfig. In the case of some code where it is modular, we can extend that to also include files that are building basic support functionality but not related to loading or registering the final module; such files also have no need whatsoever for module.h The advantage in removing such instances is that module.h itself sources about 15 other headers; adding significantly to what we feed cpp, and it can obscure what headers we are effectively using. Since module.h might have been the implicit source for init.h (for __init) and for export.h (for EXPORT_SYMBOL) we consider each instance for the presence of either and replace/add as needed. Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code. Build coverage of all the mips defconfigs revealed the module.h header was masking a couple of implicit include instances, so we add the appropriate headers there. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: David Daney <david.daney@cavium.com> Cc: John Crispin <john@phrozen.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: "Steven J. Hill" <steven.hill@cavium.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/15131/ [james.hogan@imgtec.com: Preserve sort order where it already exists] Signed-off-by: James Hogan <james.hogan@imgtec.com>
206 lines
4.4 KiB
C
206 lines
4.4 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
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*/
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/clk.h>
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#include <bcm63xx_cpu.h>
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#include <bcm63xx_io.h>
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#include <bcm63xx_timer.h>
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#include <bcm63xx_regs.h>
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static DEFINE_RAW_SPINLOCK(timer_reg_lock);
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static DEFINE_RAW_SPINLOCK(timer_data_lock);
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static struct clk *periph_clk;
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static struct timer_data {
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void (*cb)(void *);
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void *data;
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} timer_data[BCM63XX_TIMER_COUNT];
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static irqreturn_t timer_interrupt(int irq, void *dev_id)
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{
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u32 stat;
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int i;
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raw_spin_lock(&timer_reg_lock);
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stat = bcm_timer_readl(TIMER_IRQSTAT_REG);
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bcm_timer_writel(stat, TIMER_IRQSTAT_REG);
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raw_spin_unlock(&timer_reg_lock);
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for (i = 0; i < BCM63XX_TIMER_COUNT; i++) {
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if (!(stat & TIMER_IRQSTAT_TIMER_CAUSE(i)))
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continue;
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raw_spin_lock(&timer_data_lock);
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if (!timer_data[i].cb) {
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raw_spin_unlock(&timer_data_lock);
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continue;
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}
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timer_data[i].cb(timer_data[i].data);
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raw_spin_unlock(&timer_data_lock);
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}
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return IRQ_HANDLED;
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}
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int bcm63xx_timer_enable(int id)
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{
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u32 reg;
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unsigned long flags;
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if (id >= BCM63XX_TIMER_COUNT)
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return -EINVAL;
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raw_spin_lock_irqsave(&timer_reg_lock, flags);
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reg = bcm_timer_readl(TIMER_CTLx_REG(id));
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reg |= TIMER_CTL_ENABLE_MASK;
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bcm_timer_writel(reg, TIMER_CTLx_REG(id));
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reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
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reg |= TIMER_IRQSTAT_TIMER_IR_EN(id);
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bcm_timer_writel(reg, TIMER_IRQSTAT_REG);
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raw_spin_unlock_irqrestore(&timer_reg_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(bcm63xx_timer_enable);
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int bcm63xx_timer_disable(int id)
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{
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u32 reg;
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unsigned long flags;
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if (id >= BCM63XX_TIMER_COUNT)
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return -EINVAL;
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raw_spin_lock_irqsave(&timer_reg_lock, flags);
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reg = bcm_timer_readl(TIMER_CTLx_REG(id));
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reg &= ~TIMER_CTL_ENABLE_MASK;
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bcm_timer_writel(reg, TIMER_CTLx_REG(id));
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reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
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reg &= ~TIMER_IRQSTAT_TIMER_IR_EN(id);
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bcm_timer_writel(reg, TIMER_IRQSTAT_REG);
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raw_spin_unlock_irqrestore(&timer_reg_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(bcm63xx_timer_disable);
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int bcm63xx_timer_register(int id, void (*callback)(void *data), void *data)
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{
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unsigned long flags;
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int ret;
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if (id >= BCM63XX_TIMER_COUNT || !callback)
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return -EINVAL;
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ret = 0;
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raw_spin_lock_irqsave(&timer_data_lock, flags);
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if (timer_data[id].cb) {
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ret = -EBUSY;
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goto out;
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}
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timer_data[id].cb = callback;
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timer_data[id].data = data;
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out:
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raw_spin_unlock_irqrestore(&timer_data_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(bcm63xx_timer_register);
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void bcm63xx_timer_unregister(int id)
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{
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unsigned long flags;
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if (id >= BCM63XX_TIMER_COUNT)
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return;
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raw_spin_lock_irqsave(&timer_data_lock, flags);
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timer_data[id].cb = NULL;
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raw_spin_unlock_irqrestore(&timer_data_lock, flags);
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}
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EXPORT_SYMBOL(bcm63xx_timer_unregister);
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unsigned int bcm63xx_timer_countdown(unsigned int countdown_us)
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{
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return (clk_get_rate(periph_clk) / (1000 * 1000)) * countdown_us;
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}
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EXPORT_SYMBOL(bcm63xx_timer_countdown);
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int bcm63xx_timer_set(int id, int monotonic, unsigned int countdown_us)
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{
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u32 reg, countdown;
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unsigned long flags;
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if (id >= BCM63XX_TIMER_COUNT)
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return -EINVAL;
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countdown = bcm63xx_timer_countdown(countdown_us);
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if (countdown & ~TIMER_CTL_COUNTDOWN_MASK)
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return -EINVAL;
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raw_spin_lock_irqsave(&timer_reg_lock, flags);
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reg = bcm_timer_readl(TIMER_CTLx_REG(id));
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if (monotonic)
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reg &= ~TIMER_CTL_MONOTONIC_MASK;
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else
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reg |= TIMER_CTL_MONOTONIC_MASK;
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reg &= ~TIMER_CTL_COUNTDOWN_MASK;
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reg |= countdown;
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bcm_timer_writel(reg, TIMER_CTLx_REG(id));
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raw_spin_unlock_irqrestore(&timer_reg_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(bcm63xx_timer_set);
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int bcm63xx_timer_init(void)
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{
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int ret, irq;
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u32 reg;
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reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
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reg &= ~TIMER_IRQSTAT_TIMER0_IR_EN;
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reg &= ~TIMER_IRQSTAT_TIMER1_IR_EN;
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reg &= ~TIMER_IRQSTAT_TIMER2_IR_EN;
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bcm_timer_writel(reg, TIMER_IRQSTAT_REG);
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periph_clk = clk_get(NULL, "periph");
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if (IS_ERR(periph_clk))
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return -ENODEV;
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irq = bcm63xx_get_irq_number(IRQ_TIMER);
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ret = request_irq(irq, timer_interrupt, 0, "bcm63xx_timer", NULL);
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if (ret) {
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pr_err("%s: failed to register irq\n", __func__);
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return ret;
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}
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return 0;
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}
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arch_initcall(bcm63xx_timer_init);
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