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109 lines
2.6 KiB
109 lines
2.6 KiB
/* |
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* Driver for GE FPGA based GPIO |
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* |
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* Author: Martyn Welch <[email protected]> |
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* |
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* 2008 (c) GE Intelligent Platforms Embedded Systems, Inc. |
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* |
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* This file is licensed under the terms of the GNU General Public License |
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* version 2. This program is licensed "as is" without any warranty of any |
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* kind, whether express or implied. |
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*/ |
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/* TODO |
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* |
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* Configuration of output modes (totem-pole/open-drain) |
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* Interrupt configuration - interrupts are always generated the FPGA relies on |
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* the I/O interrupt controllers mask to stop them propergating |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/io.h> |
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#include <linux/slab.h> |
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#include <linux/of_device.h> |
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#include <linux/of_address.h> |
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#include <linux/module.h> |
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#include <linux/gpio/driver.h> |
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#define GEF_GPIO_DIRECT 0x00 |
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#define GEF_GPIO_IN 0x04 |
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#define GEF_GPIO_OUT 0x08 |
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#define GEF_GPIO_TRIG 0x0C |
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#define GEF_GPIO_POLAR_A 0x10 |
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#define GEF_GPIO_POLAR_B 0x14 |
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#define GEF_GPIO_INT_STAT 0x18 |
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#define GEF_GPIO_OVERRUN 0x1C |
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#define GEF_GPIO_MODE 0x20 |
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static const struct of_device_id gef_gpio_ids[] = { |
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{ |
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.compatible = "gef,sbc610-gpio", |
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.data = (void *)19, |
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}, { |
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.compatible = "gef,sbc310-gpio", |
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.data = (void *)6, |
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}, { |
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.compatible = "ge,imp3a-gpio", |
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.data = (void *)16, |
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}, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, gef_gpio_ids); |
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static int __init gef_gpio_probe(struct platform_device *pdev) |
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{ |
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struct gpio_chip *gc; |
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void __iomem *regs; |
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int ret; |
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gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL); |
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if (!gc) |
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return -ENOMEM; |
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regs = of_iomap(pdev->dev.of_node, 0); |
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if (!regs) |
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return -ENOMEM; |
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ret = bgpio_init(gc, &pdev->dev, 4, regs + GEF_GPIO_IN, |
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regs + GEF_GPIO_OUT, NULL, NULL, |
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regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER); |
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if (ret) { |
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dev_err(&pdev->dev, "bgpio_init failed\n"); |
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goto err0; |
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} |
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/* Setup pointers to chip functions */ |
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gc->label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOF", pdev->dev.of_node); |
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if (!gc->label) { |
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ret = -ENOMEM; |
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goto err0; |
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} |
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gc->base = -1; |
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gc->ngpio = (u16)(uintptr_t)of_device_get_match_data(&pdev->dev); |
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gc->of_gpio_n_cells = 2; |
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gc->of_node = pdev->dev.of_node; |
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/* This function adds a memory mapped GPIO chip */ |
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ret = devm_gpiochip_add_data(&pdev->dev, gc, NULL); |
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if (ret) |
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goto err0; |
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return 0; |
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err0: |
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iounmap(regs); |
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pr_err("%pOF: GPIO chip registration failed\n", pdev->dev.of_node); |
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return ret; |
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}; |
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static struct platform_driver gef_gpio_driver = { |
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.driver = { |
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.name = "gef-gpio", |
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.of_match_table = gef_gpio_ids, |
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}, |
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}; |
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module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe); |
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MODULE_DESCRIPTION("GE I/O FPGA GPIO driver"); |
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MODULE_AUTHOR("Martyn Welch <[email protected]"); |
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MODULE_LICENSE("GPL");
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