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author | Mars Cheng <mars.cheng@mediatek.com> | 2017-03-19 23:26:23 +0800 |
---|---|---|
committer | Marc Zyngier <marc.zyngier@arm.com> | 2017-04-07 10:52:17 +0100 |
commit | 13683f9bb6166ba0d67e8f89cad85e064032c0f8 (patch) | |
tree | 755c2d90742086c514388e0ebeb4bbf68c4604bf /drivers/irqchip/irq-mtk-sysirq.c | |
parent | d240fe0a4066e592f8e3a698d8648bdd47bc51b7 (diff) | |
download | linux-13683f9bb6166ba0d67e8f89cad85e064032c0f8.tar.gz linux-13683f9bb6166ba0d67e8f89cad85e064032c0f8.tar.bz2 linux-13683f9bb6166ba0d67e8f89cad85e064032c0f8.zip |
irqchip/mtk-sysirq: Extend intpol base to arbitrary number
Originally driver only supports one base. However, MT6797 has
more than one bases to configure interrupt polarity. To support
possible design change, here comes a solution to use arbitrary
number of bases.
Signed-off-by: Mars Cheng <mars.cheng@mediatek.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip/irq-mtk-sysirq.c')
-rw-r--r-- | drivers/irqchip/irq-mtk-sysirq.c | 116 |
1 files changed, 95 insertions, 21 deletions
diff --git a/drivers/irqchip/irq-mtk-sysirq.c b/drivers/irqchip/irq-mtk-sysirq.c index 63ac73b1d9c8..9ba969cfad81 100644 --- a/drivers/irqchip/irq-mtk-sysirq.c +++ b/drivers/irqchip/irq-mtk-sysirq.c @@ -24,22 +24,29 @@ struct mtk_sysirq_chip_data { spinlock_t lock; - void __iomem *intpol_base; + u32 nr_intpol_bases; + void __iomem **intpol_bases; + u32 *intpol_words; + u8 *intpol_idx; + u16 *which_word; }; static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type) { irq_hw_number_t hwirq = data->hwirq; struct mtk_sysirq_chip_data *chip_data = data->chip_data; + u8 intpol_idx = chip_data->intpol_idx[hwirq]; + void __iomem *base; u32 offset, reg_index, value; unsigned long flags; int ret; + base = chip_data->intpol_bases[intpol_idx]; + reg_index = chip_data->which_word[hwirq]; offset = hwirq & 0x1f; - reg_index = hwirq >> 5; spin_lock_irqsave(&chip_data->lock, flags); - value = readl_relaxed(chip_data->intpol_base + reg_index * 4); + value = readl_relaxed(base + reg_index * 4); if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) { if (type == IRQ_TYPE_LEVEL_LOW) type = IRQ_TYPE_LEVEL_HIGH; @@ -49,7 +56,8 @@ static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type) } else { value &= ~(1 << offset); } - writel(value, chip_data->intpol_base + reg_index * 4); + + writel(value, base + reg_index * 4); data = data->parent_data; ret = data->chip->irq_set_type(data, type); @@ -124,8 +132,7 @@ static int __init mtk_sysirq_of_init(struct device_node *node, { struct irq_domain *domain, *domain_parent; struct mtk_sysirq_chip_data *chip_data; - int ret, size, intpol_num; - struct resource res; + int ret, size, intpol_num = 0, nr_intpol_bases = 0, i = 0; domain_parent = irq_find_host(parent); if (!domain_parent) { @@ -133,36 +140,103 @@ static int __init mtk_sysirq_of_init(struct device_node *node, return -EINVAL; } - ret = of_address_to_resource(node, 0, &res); - if (ret) - return ret; - chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL); if (!chip_data) return -ENOMEM; - size = resource_size(&res); - intpol_num = size * 8; - chip_data->intpol_base = ioremap(res.start, size); - if (!chip_data->intpol_base) { - pr_err("mtk_sysirq: unable to map sysirq register\n"); - ret = -ENXIO; - goto out_free; + while (of_get_address(node, i++, NULL, NULL)) + nr_intpol_bases++; + + if (nr_intpol_bases == 0) { + pr_err("mtk_sysirq: base address not specified\n"); + ret = -EINVAL; + goto out_free_chip; + } + + chip_data->intpol_words = kcalloc(nr_intpol_bases, + sizeof(*chip_data->intpol_words), + GFP_KERNEL); + if (!chip_data->intpol_words) { + ret = -ENOMEM; + goto out_free_chip; + } + + chip_data->intpol_bases = kcalloc(nr_intpol_bases, + sizeof(*chip_data->intpol_bases), + GFP_KERNEL); + if (!chip_data->intpol_bases) { + ret = -ENOMEM; + goto out_free_intpol_words; + } + + for (i = 0; i < nr_intpol_bases; i++) { + struct resource res; + + ret = of_address_to_resource(node, i, &res); + size = resource_size(&res); + intpol_num += size * 8; + chip_data->intpol_words[i] = size / 4; + chip_data->intpol_bases[i] = of_iomap(node, i); + if (ret || !chip_data->intpol_bases[i]) { + pr_err("%s: couldn't map region %d\n", + node->full_name, i); + ret = -ENODEV; + goto out_free_intpol; + } + } + + chip_data->intpol_idx = kcalloc(intpol_num, + sizeof(*chip_data->intpol_idx), + GFP_KERNEL); + if (!chip_data->intpol_idx) { + ret = -ENOMEM; + goto out_free_intpol; + } + + chip_data->which_word = kcalloc(intpol_num, + sizeof(*chip_data->which_word), + GFP_KERNEL); + if (!chip_data->which_word) { + ret = -ENOMEM; + goto out_free_intpol_idx; + } + + /* + * assign an index of the intpol_bases for each irq + * to set it fast later + */ + for (i = 0; i < intpol_num ; i++) { + u32 word = i / 32, j; + + for (j = 0; word >= chip_data->intpol_words[j] ; j++) + word -= chip_data->intpol_words[j]; + + chip_data->intpol_idx[i] = j; + chip_data->which_word[i] = word; } domain = irq_domain_add_hierarchy(domain_parent, 0, intpol_num, node, &sysirq_domain_ops, chip_data); if (!domain) { ret = -ENOMEM; - goto out_unmap; + goto out_free_which_word; } spin_lock_init(&chip_data->lock); return 0; -out_unmap: - iounmap(chip_data->intpol_base); -out_free: +out_free_which_word: + kfree(chip_data->which_word); +out_free_intpol_idx: + kfree(chip_data->intpol_idx); +out_free_intpol: + for (i = 0; i < nr_intpol_bases; i++) + if (chip_data->intpol_bases[i]) + iounmap(chip_data->intpol_bases[i]); + kfree(chip_data->intpol_bases); +out_free_intpol_words: + kfree(chip_data->intpol_words); +out_free_chip: kfree(chip_data); return ret; } |