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4ed209326b
Siflower SF19A2890 is an SoC with: Dual-core MIPS InterAptiv at 800MHz DDR3 controller One Gigabit Ethernet MAC with RGMII and IPv4 HNAT engine Built-in 2x2 11N + 2x2 11AC WiFi radio USB 2.0 OTG I2C/SPI/GPIO and various other peripherals This PR adds support for SF19A2890 EVB with ethernet support. EVB spec: Memory: DDR3 128M Ethernet: RTL8367RB 5-port gigabit switch Flash: 16M NOR Others: MicroUSB OTG, LED x 1, Reset button x1 The built image can be flashed using u-boot recovery. This target is marked as source-only until support for a commercial router board comes. Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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#include <linux/spinlock.h>
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struct reset_sf19a28_periph_data {
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struct reset_controller_dev rcdev;
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void __iomem *base;
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spinlock_t lock;
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u32 reset_masks[];
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};
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static inline struct reset_sf19a28_periph_data *
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to_reset_sf19a28_periph_data(struct reset_controller_dev *rcdev)
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{
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return container_of(rcdev, struct reset_sf19a28_periph_data, rcdev);
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}
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static int reset_sf19a28_periph_update(struct reset_controller_dev *rcdev,
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unsigned long id, bool assert)
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{
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struct reset_sf19a28_periph_data *data = to_reset_sf19a28_periph_data(rcdev);
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unsigned long flags;
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u32 reg;
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spin_lock_irqsave(&data->lock, flags);
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reg = readl(data->base);
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if (assert)
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reg |= data->reset_masks[id];
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else
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reg &= ~data->reset_masks[id];
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writel(reg, data->base);
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spin_unlock_irqrestore(&data->lock, flags);
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return 0;
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}
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static int reset_sf19a28_periph_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return reset_sf19a28_periph_update(rcdev, id, true);
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}
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static int reset_sf19a28_periph_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return reset_sf19a28_periph_update(rcdev, id, false);
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}
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static int reset_sf19a28_periph_status(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct reset_sf19a28_periph_data *data = to_reset_sf19a28_periph_data(rcdev);
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u32 reg;
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reg = readl(data->base);
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return !!(reg & data->reset_masks[id]);
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}
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const struct reset_control_ops reset_sf19a28_periph_ops = {
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.assert = reset_sf19a28_periph_assert,
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.deassert = reset_sf19a28_periph_deassert,
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.status = reset_sf19a28_periph_status,
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};
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static const struct of_device_id reset_sf19a28_periph_dt_ids[] = {
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{ .compatible = "siflower,sf19a2890-periph-reset", },
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{ /* sentinel */ },
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};
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static int reset_sf19a28_periph_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 *node = dev->of_node;
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struct reset_sf19a28_periph_data *data;
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void __iomem *base;
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int nr_resets;
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int ret, i;
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u32 tmp;
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nr_resets = of_property_count_u32_elems(node, "siflower,reset-masks");
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if (nr_resets < 1) {
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ret = of_property_read_u32(node, "siflower,num-resets", &tmp);
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if (ret < 0 || tmp < 1)
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return -EINVAL;
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nr_resets = tmp;
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}
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if (nr_resets >= 32) {
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dev_err(dev, "too many resets.");
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return -EINVAL;
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}
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data = devm_kzalloc(dev, struct_size(data, reset_masks, nr_resets), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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ret = of_property_read_u32_array(node, "siflower,reset-masks",
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data->reset_masks, nr_resets);
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if (ret)
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for (i = 0; i < nr_resets; i++)
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data->reset_masks[i] = BIT(i);
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base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(base))
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return PTR_ERR(base);
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spin_lock_init(&data->lock);
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data->base = base;
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data->rcdev.owner = THIS_MODULE;
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data->rcdev.nr_resets = nr_resets;
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data->rcdev.ops = &reset_sf19a28_periph_ops;
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data->rcdev.of_node = dev->of_node;
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return devm_reset_controller_register(dev, &data->rcdev);
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}
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static struct platform_driver reset_sf19a28_periph_driver = {
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.probe = reset_sf19a28_periph_probe,
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.driver = {
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.name = "reset-sf19a2890-periph",
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.of_match_table = reset_sf19a28_periph_dt_ids,
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},
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};
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builtin_platform_driver(reset_sf19a28_periph_driver);
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