1 // SPDX-License-Identifier: GPL-2.0-only
21  * Provision is available on some SPEAr SoCs to control ARM PL022 spi cs
31  * struct spear_spics - represents spi chip select control
34  * @sw_enable_bit: bit to enable s/w control over chipselects
36  * @cs_enable_mask: mask to select bits required to select chipselect
38  * @use_count: use count of a spi controller cs lines
61 	tmp = readl_relaxed(spics->base + spics->perip_cfg);  in spics_set_value()
62 	if (spics->last_off != offset) {  in spics_set_value()
63 		spics->last_off = offset;  in spics_set_value()
64 		tmp &= ~(spics->cs_enable_mask << spics->cs_enable_shift);  in spics_set_value()
65 		tmp |= offset << spics->cs_enable_shift;  in spics_set_value()
69 	tmp &= ~(0x1 << spics->cs_value_bit);  in spics_set_value()
70 	tmp |= value << spics->cs_value_bit;  in spics_set_value()
71 	writel_relaxed(tmp, spics->base + spics->perip_cfg);  in spics_set_value()
87 	if (!spics->use_count++) {  in spics_request()
88 		tmp = readl_relaxed(spics->base + spics->perip_cfg);  in spics_request()
89 		tmp |= 0x1 << spics->sw_enable_bit;  in spics_request()
90 		tmp |= 0x1 << spics->cs_value_bit;  in spics_request()
91 		writel_relaxed(tmp, spics->base + spics->perip_cfg);  in spics_request()
102 	if (!--spics->use_count) {  in spics_free()
103 		tmp = readl_relaxed(spics->base + spics->perip_cfg);  in spics_free()
104 		tmp &= ~(0x1 << spics->sw_enable_bit);  in spics_free()
105 		writel_relaxed(tmp, spics->base + spics->perip_cfg);  in spics_free()
111 	struct device_node *np = pdev->dev.of_node;  in spics_gpio_probe()
114 	spics = devm_kzalloc(&pdev->dev, sizeof(*spics), GFP_KERNEL);  in spics_gpio_probe()
116 		return -ENOMEM;  in spics_gpio_probe()
118 	spics->base = devm_platform_ioremap_resource(pdev, 0);  in spics_gpio_probe()
119 	if (IS_ERR(spics->base))  in spics_gpio_probe()
120 		return PTR_ERR(spics->base);  in spics_gpio_probe()
122 	if (of_property_read_u32(np, "st-spics,peripcfg-reg",  in spics_gpio_probe()
123 				&spics->perip_cfg))  in spics_gpio_probe()
125 	if (of_property_read_u32(np, "st-spics,sw-enable-bit",  in spics_gpio_probe()
126 				&spics->sw_enable_bit))  in spics_gpio_probe()
128 	if (of_property_read_u32(np, "st-spics,cs-value-bit",  in spics_gpio_probe()
129 				&spics->cs_value_bit))  in spics_gpio_probe()
131 	if (of_property_read_u32(np, "st-spics,cs-enable-mask",  in spics_gpio_probe()
132 				&spics->cs_enable_mask))  in spics_gpio_probe()
134 	if (of_property_read_u32(np, "st-spics,cs-enable-shift",  in spics_gpio_probe()
135 				&spics->cs_enable_shift))  in spics_gpio_probe()
138 	spics->chip.ngpio = NUM_OF_GPIO;  in spics_gpio_probe()
139 	spics->chip.base = -1;  in spics_gpio_probe()
140 	spics->chip.request = spics_request;  in spics_gpio_probe()
141 	spics->chip.free = spics_free;  in spics_gpio_probe()
142 	spics->chip.direction_output = spics_direction_output;  in spics_gpio_probe()
143 	spics->chip.set = spics_set_value;  in spics_gpio_probe()
144 	spics->chip.label = dev_name(&pdev->dev);  in spics_gpio_probe()
145 	spics->chip.parent = &pdev->dev;  in spics_gpio_probe()
146 	spics->chip.owner = THIS_MODULE;  in spics_gpio_probe()
147 	spics->last_off = -1;  in spics_gpio_probe()
149 	return devm_gpiochip_add_data(&pdev->dev, &spics->chip, spics);  in spics_gpio_probe()
152 	dev_err(&pdev->dev, "DT probe failed\n");  in spics_gpio_probe()
153 	return -EINVAL;  in spics_gpio_probe()
157 	{ .compatible = "st,spear-spics-gpio" },
164 		.name = "spear-spics-gpio",