161 lines
4.3 KiB
C
161 lines
4.3 KiB
C
/*
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* AppliedMicro X-Gene SoC GPIO-Standby Driver
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*
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* Copyright (c) 2014, Applied Micro Circuits Corporation
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* Author: Tin Huynh <tnhuynh@apm.com>.
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* Y Vo <yvo@apm.com>.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/of_gpio.h>
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#include <linux/gpio.h>
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#include <linux/gpio/driver.h>
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#include <linux/basic_mmio_gpio.h>
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#define XGENE_MAX_GPIO_DS 22
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#define XGENE_MAX_GPIO_DS_IRQ 6
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#define GPIO_MASK(x) (1U << ((x) % 32))
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#define MPA_GPIO_INT_LVL 0x0290
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#define MPA_GPIO_OE_ADDR 0x029c
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#define MPA_GPIO_OUT_ADDR 0x02a0
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#define MPA_GPIO_IN_ADDR 0x02a4
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#define MPA_GPIO_SEL_LO 0x0294
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/**
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* struct xgene_gpio_sb - GPIO-Standby private data structure.
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* @bgc: memory-mapped GPIO controllers.
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* @irq: Mapping GPIO pins and interrupt number
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* nirq: Number of GPIO pins that supports interrupt
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*/
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struct xgene_gpio_sb {
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struct bgpio_chip bgc;
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u32 *irq;
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u32 nirq;
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};
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static inline struct xgene_gpio_sb *to_xgene_gpio_sb(struct gpio_chip *gc)
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{
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struct bgpio_chip *bgc = to_bgpio_chip(gc);
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return container_of(bgc, struct xgene_gpio_sb, bgc);
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}
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static void xgene_gpio_set_bit(struct bgpio_chip *bgc, void __iomem *reg, u32 gpio, int val)
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{
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u32 data;
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data = bgc->read_reg(reg);
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if (val)
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data |= GPIO_MASK(gpio);
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else
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data &= ~GPIO_MASK(gpio);
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bgc->write_reg(reg, data);
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}
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static int apm_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio)
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{
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struct xgene_gpio_sb *priv = to_xgene_gpio_sb(gc);
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if (priv->irq[gpio])
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return priv->irq[gpio];
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return -ENXIO;
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}
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static int xgene_gpio_sb_probe(struct platform_device *pdev)
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{
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struct xgene_gpio_sb *priv;
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u32 ret, i;
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u32 default_lines[] = {0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D};
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struct resource *res;
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void __iomem *regs;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(regs))
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return PTR_ERR(regs);
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ret = bgpio_init(&priv->bgc, &pdev->dev, 4,
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regs + MPA_GPIO_IN_ADDR,
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regs + MPA_GPIO_OUT_ADDR, NULL,
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regs + MPA_GPIO_OE_ADDR, NULL, 0);
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if (ret)
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return ret;
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priv->bgc.gc.to_irq = apm_gpio_sb_to_irq;
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priv->bgc.gc.ngpio = XGENE_MAX_GPIO_DS;
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priv->nirq = XGENE_MAX_GPIO_DS_IRQ;
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priv->irq = devm_kzalloc(&pdev->dev, sizeof(u32) * XGENE_MAX_GPIO_DS,
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GFP_KERNEL);
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if (!priv->irq)
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return -ENOMEM;
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memset(priv->irq, 0, sizeof(u32) * XGENE_MAX_GPIO_DS);
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for (i = 0; i < priv->nirq; i++) {
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priv->irq[default_lines[i]] = platform_get_irq(pdev, i);
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xgene_gpio_set_bit(&priv->bgc, regs + MPA_GPIO_SEL_LO,
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default_lines[i] * 2, 1);
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xgene_gpio_set_bit(&priv->bgc, regs + MPA_GPIO_INT_LVL, i, 1);
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}
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platform_set_drvdata(pdev, priv);
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ret = gpiochip_add(&priv->bgc.gc);
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if (ret)
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dev_err(&pdev->dev, "failed to register X-Gene GPIO Standby driver\n");
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else
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dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n");
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return ret;
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}
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static int xgene_gpio_sb_remove(struct platform_device *pdev)
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{
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struct xgene_gpio_sb *priv = platform_get_drvdata(pdev);
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return bgpio_remove(&priv->bgc);
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}
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static const struct of_device_id xgene_gpio_sb_of_match[] = {
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{.compatible = "apm,xgene-gpio-sb", },
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{},
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};
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MODULE_DEVICE_TABLE(of, xgene_gpio_sb_of_match);
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static struct platform_driver xgene_gpio_sb_driver = {
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.driver = {
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.name = "xgene-gpio-sb",
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.of_match_table = xgene_gpio_sb_of_match,
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},
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.probe = xgene_gpio_sb_probe,
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.remove = xgene_gpio_sb_remove,
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};
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module_platform_driver(xgene_gpio_sb_driver);
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MODULE_AUTHOR("AppliedMicro");
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MODULE_DESCRIPTION("APM X-Gene GPIO Standby driver");
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MODULE_LICENSE("GPL");
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