1 // SPDX-License-Identifier: GPL-2.0-or-later
17 #include "line-display.h"
22  * struct img_ascii_lcd_config - Configuration information about an LCD model
23  * @num_chars: the number of characters the LCD can display
34  * struct img_ascii_lcd_ctx - Private data structure
36  * @base: the base address of the LCD registers
37  * @regmap: the regmap through which LCD registers are accessed
38  * @offset: the offset within regmap to the start of the LCD registers
50  * MIPS Boston development board
60 	val = *((u64 *)&linedisp->buf[0]);  in boston_update()
61 	__raw_writeq(val, ctx->base);  in boston_update()
63 	val = *((u32 *)&linedisp->buf[0]);  in boston_update()
64 	__raw_writel(val, ctx->base);  in boston_update()
65 	val = *((u32 *)&linedisp->buf[4]);  in boston_update()
66 	__raw_writel(val, ctx->base + 4);  in boston_update()
90 	for (i = 0; i < linedisp->num_chars; i++) {  in malta_update()
91 		err = regmap_write(ctx->regmap,  in malta_update()
92 				   ctx->offset + (i * 8), linedisp->buf[i]);  in malta_update()
98 		pr_err_ratelimited("Failed to update LCD display: %d\n", err);  in malta_update()
129 		err = regmap_read(ctx->regmap,  in sead3_wait_sm_idle()
130 				  ctx->offset + SEAD3_REG_CPLD_STATUS,  in sead3_wait_sm_idle()
150 		err = regmap_read(ctx->regmap,  in sead3_wait_lcd_idle()
151 				  ctx->offset + SEAD3_REG_LCD_CTRL,  in sead3_wait_lcd_idle()
160 		err = regmap_read(ctx->regmap,  in sead3_wait_lcd_idle()
161 				  ctx->offset + SEAD3_REG_CPLD_DATA,  in sead3_wait_lcd_idle()
177 	for (i = 0; i < linedisp->num_chars; i++) {  in sead3_update()
182 		err = regmap_write(ctx->regmap,  in sead3_update()
183 				   ctx->offset + SEAD3_REG_LCD_CTRL,  in sead3_update()
192 		err = regmap_write(ctx->regmap,  in sead3_update()
193 				   ctx->offset + SEAD3_REG_LCD_DATA,  in sead3_update()
194 				   linedisp->buf[i]);  in sead3_update()
200 		pr_err_ratelimited("Failed to update LCD display: %d\n", err);  in sead3_update()
212 	{ .compatible = "img,boston-lcd", .data = &boston_config },
213 	{ .compatible = "mti,malta-lcd", .data = &malta_config },
214 	{ .compatible = "mti,sead3-lcd", .data = &sead3_config },
220  * img_ascii_lcd_probe() - probe an LCD display device
221  * @pdev: the LCD platform device
223  * Probe an LCD display device, ensuring that we have the required resources in
224  * order to access the LCD & setting up private data as well as sysfs files.
226  * Return: 0 on success, else -ERRNO
230 	struct device *dev = &pdev->dev;  in img_ascii_lcd_probe()
237 		return -ENOMEM;  in img_ascii_lcd_probe()
239 	if (cfg->external_regmap) {  in img_ascii_lcd_probe()
240 		ctx->regmap = syscon_node_to_regmap(dev->parent->of_node);  in img_ascii_lcd_probe()
241 		if (IS_ERR(ctx->regmap))  in img_ascii_lcd_probe()
242 			return PTR_ERR(ctx->regmap);  in img_ascii_lcd_probe()
244 		if (of_property_read_u32(dev->of_node, "offset", &ctx->offset))  in img_ascii_lcd_probe()
245 			return -EINVAL;  in img_ascii_lcd_probe()
247 		ctx->base = devm_platform_ioremap_resource(pdev, 0);  in img_ascii_lcd_probe()
248 		if (IS_ERR(ctx->base))  in img_ascii_lcd_probe()
249 			return PTR_ERR(ctx->base);  in img_ascii_lcd_probe()
252 	err = linedisp_register(&ctx->linedisp, dev, cfg->num_chars, &cfg->ops);  in img_ascii_lcd_probe()
257 	err = compat_only_sysfs_link_entry_to_kobj(&dev->kobj,  in img_ascii_lcd_probe()
258 						   &ctx->linedisp.dev.kobj,  in img_ascii_lcd_probe()
267 	linedisp_unregister(&ctx->linedisp);  in img_ascii_lcd_probe()
272  * img_ascii_lcd_remove() - remove an LCD display device
273  * @pdev: the LCD platform device
275  * Remove an LCD display device, freeing private resources & ensuring that the
276  * driver stops using the LCD display registers.
282 	sysfs_remove_link(&pdev->dev.kobj, "message");  in img_ascii_lcd_remove()
283 	linedisp_unregister(&ctx->linedisp);  in img_ascii_lcd_remove()
288 		.name		= "img-ascii-lcd",
296 MODULE_DESCRIPTION("Imagination Technologies ASCII LCD Display");