261 lines
6.8 KiB
C
261 lines
6.8 KiB
C
/*
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* Copyright (C) 2015 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of 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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#include <linux/bitops.h>
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#include <linux/gpio/driver.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/module.h>
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#include <linux/basic_mmio_gpio.h>
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#define GIO_BANK_SIZE 0x20
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#define GIO_ODEN(bank) (((bank) * GIO_BANK_SIZE) + 0x00)
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#define GIO_DATA(bank) (((bank) * GIO_BANK_SIZE) + 0x04)
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#define GIO_IODIR(bank) (((bank) * GIO_BANK_SIZE) + 0x08)
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#define GIO_EC(bank) (((bank) * GIO_BANK_SIZE) + 0x0c)
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#define GIO_EI(bank) (((bank) * GIO_BANK_SIZE) + 0x10)
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#define GIO_MASK(bank) (((bank) * GIO_BANK_SIZE) + 0x14)
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#define GIO_LEVEL(bank) (((bank) * GIO_BANK_SIZE) + 0x18)
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#define GIO_STAT(bank) (((bank) * GIO_BANK_SIZE) + 0x1c)
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struct brcmstb_gpio_bank {
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struct list_head node;
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int id;
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struct bgpio_chip bgc;
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struct brcmstb_gpio_priv *parent_priv;
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u32 width;
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};
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struct brcmstb_gpio_priv {
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struct list_head bank_list;
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void __iomem *reg_base;
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int num_banks;
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struct platform_device *pdev;
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int gpio_base;
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};
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#define MAX_GPIO_PER_BANK 32
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#define GPIO_BANK(gpio) ((gpio) >> 5)
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/* assumes MAX_GPIO_PER_BANK is a multiple of 2 */
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#define GPIO_BIT(gpio) ((gpio) & (MAX_GPIO_PER_BANK - 1))
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static inline struct brcmstb_gpio_bank *
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brcmstb_gpio_gc_to_bank(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 brcmstb_gpio_bank, bgc);
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}
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static inline struct brcmstb_gpio_priv *
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brcmstb_gpio_gc_to_priv(struct gpio_chip *gc)
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{
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struct brcmstb_gpio_bank *bank = brcmstb_gpio_gc_to_bank(gc);
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return bank->parent_priv;
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}
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/* Make sure that the number of banks matches up between properties */
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static int brcmstb_gpio_sanity_check_banks(struct device *dev,
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struct device_node *np, struct resource *res)
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{
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int res_num_banks = resource_size(res) / GIO_BANK_SIZE;
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int num_banks =
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of_property_count_u32_elems(np, "brcm,gpio-bank-widths");
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if (res_num_banks != num_banks) {
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dev_err(dev, "Mismatch in banks: res had %d, bank-widths had %d\n",
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res_num_banks, num_banks);
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return -EINVAL;
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} else {
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return 0;
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}
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}
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static int brcmstb_gpio_remove(struct platform_device *pdev)
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{
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struct brcmstb_gpio_priv *priv = platform_get_drvdata(pdev);
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struct list_head *pos;
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struct brcmstb_gpio_bank *bank;
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int ret = 0;
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if (!priv) {
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dev_err(&pdev->dev, "called %s without drvdata!\n", __func__);
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return -EFAULT;
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}
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/*
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* You can lose return values below, but we report all errors, and it's
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* more important to actually perform all of the steps.
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*/
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list_for_each(pos, &priv->bank_list) {
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bank = list_entry(pos, struct brcmstb_gpio_bank, node);
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ret = bgpio_remove(&bank->bgc);
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if (ret)
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dev_err(&pdev->dev, "gpiochip_remove fail in cleanup");
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}
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return ret;
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}
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static int brcmstb_gpio_of_xlate(struct gpio_chip *gc,
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const struct of_phandle_args *gpiospec, u32 *flags)
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{
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struct brcmstb_gpio_priv *priv = brcmstb_gpio_gc_to_priv(gc);
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struct brcmstb_gpio_bank *bank = brcmstb_gpio_gc_to_bank(gc);
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int offset;
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if (gc->of_gpio_n_cells != 2) {
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WARN_ON(1);
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return -EINVAL;
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}
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if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
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return -EINVAL;
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offset = gpiospec->args[0] - (gc->base - priv->gpio_base);
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if (offset >= gc->ngpio)
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return -EINVAL;
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if (unlikely(offset >= bank->width)) {
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dev_warn_ratelimited(&priv->pdev->dev,
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"Received request for invalid GPIO offset %d\n",
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gpiospec->args[0]);
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}
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if (flags)
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*flags = gpiospec->args[1];
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return offset;
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}
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static int brcmstb_gpio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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void __iomem *reg_base;
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struct brcmstb_gpio_priv *priv;
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struct resource *res;
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struct property *prop;
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const __be32 *p;
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u32 bank_width;
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int err;
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static int gpio_base;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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platform_set_drvdata(pdev, priv);
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INIT_LIST_HEAD(&priv->bank_list);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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reg_base = devm_ioremap_resource(dev, res);
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if (IS_ERR(reg_base))
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return PTR_ERR(reg_base);
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priv->gpio_base = gpio_base;
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priv->reg_base = reg_base;
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priv->pdev = pdev;
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if (brcmstb_gpio_sanity_check_banks(dev, np, res))
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return -EINVAL;
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of_property_for_each_u32(np, "brcm,gpio-bank-widths", prop, p,
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bank_width) {
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struct brcmstb_gpio_bank *bank;
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struct bgpio_chip *bgc;
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struct gpio_chip *gc;
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bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
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if (!bank) {
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err = -ENOMEM;
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goto fail;
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}
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bank->parent_priv = priv;
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bank->id = priv->num_banks;
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if (bank_width <= 0 || bank_width > MAX_GPIO_PER_BANK) {
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dev_err(dev, "Invalid bank width %d\n", bank_width);
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goto fail;
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} else {
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bank->width = bank_width;
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}
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/*
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* Regs are 4 bytes wide, have data reg, no set/clear regs,
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* and direction bits have 0 = output and 1 = input
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*/
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bgc = &bank->bgc;
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err = bgpio_init(bgc, dev, 4,
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reg_base + GIO_DATA(bank->id),
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NULL, NULL, NULL,
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reg_base + GIO_IODIR(bank->id), 0);
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if (err) {
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dev_err(dev, "bgpio_init() failed\n");
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goto fail;
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}
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gc = &bgc->gc;
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gc->of_node = np;
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gc->owner = THIS_MODULE;
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gc->label = np->full_name;
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gc->base = gpio_base;
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gc->of_gpio_n_cells = 2;
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gc->of_xlate = brcmstb_gpio_of_xlate;
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/* not all ngpio lines are valid, will use bank width later */
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gc->ngpio = MAX_GPIO_PER_BANK;
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err = gpiochip_add(gc);
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if (err) {
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dev_err(dev, "Could not add gpiochip for bank %d\n",
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bank->id);
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goto fail;
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}
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gpio_base += gc->ngpio;
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dev_dbg(dev, "bank=%d, base=%d, ngpio=%d, width=%d\n", bank->id,
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gc->base, gc->ngpio, bank->width);
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/* Everything looks good, so add bank to list */
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list_add(&bank->node, &priv->bank_list);
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priv->num_banks++;
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}
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dev_info(dev, "Registered %d banks (GPIO(s): %d-%d)\n",
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priv->num_banks, priv->gpio_base, gpio_base - 1);
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return 0;
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fail:
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(void) brcmstb_gpio_remove(pdev);
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return err;
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}
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static const struct of_device_id brcmstb_gpio_of_match[] = {
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{ .compatible = "brcm,brcmstb-gpio" },
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{},
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};
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MODULE_DEVICE_TABLE(of, brcmstb_gpio_of_match);
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static struct platform_driver brcmstb_gpio_driver = {
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.driver = {
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.name = "brcmstb-gpio",
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.of_match_table = brcmstb_gpio_of_match,
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},
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.probe = brcmstb_gpio_probe,
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.remove = brcmstb_gpio_remove,
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};
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module_platform_driver(brcmstb_gpio_driver);
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MODULE_AUTHOR("Gregory Fong");
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MODULE_DESCRIPTION("Driver for Broadcom BRCMSTB SoC UPG GPIO");
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MODULE_LICENSE("GPL v2");
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