Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Bartosz Golaszewski | 584 | 99.66% | 2 | 66.67% |
Thomas Gleixner | 2 | 0.34% | 1 | 33.33% |
Total | 586 | 3 |
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// SPDX-License-Identifier: GPL-2.0-only /* * TI da8xx DDR2/mDDR controller driver * * Copyright (C) 2016 BayLibre SAS * * Author: * Bartosz Golaszewski <bgolaszewski@baylibre.com> */ #include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/io.h> /* * REVISIT: Linux doesn't have a good framework for the kind of performance * knobs this driver controls. We can't use device tree properties as it deals * with hardware configuration rather than description. We also don't want to * commit to maintaining some random sysfs attributes. * * For now we just hardcode the register values for the boards that need * some changes (as is the case for the LCD controller on da850-lcdk - the * first board we support here). When linux gets an appropriate framework, * we'll easily convert the driver to it. */ struct da8xx_ddrctl_config_knob { const char *name; u32 reg; u32 mask; u32 shift; }; static const struct da8xx_ddrctl_config_knob da8xx_ddrctl_knobs[] = { { .name = "da850-pbbpr", .reg = 0x20, .mask = 0xffffff00, .shift = 0, }, }; struct da8xx_ddrctl_setting { const char *name; u32 val; }; struct da8xx_ddrctl_board_settings { const char *board; const struct da8xx_ddrctl_setting *settings; }; static const struct da8xx_ddrctl_setting da850_lcdk_ddrctl_settings[] = { { .name = "da850-pbbpr", .val = 0x20, }, { } }; static const struct da8xx_ddrctl_board_settings da8xx_ddrctl_board_confs[] = { { .board = "ti,da850-lcdk", .settings = da850_lcdk_ddrctl_settings, }, }; static const struct da8xx_ddrctl_config_knob * da8xx_ddrctl_match_knob(const struct da8xx_ddrctl_setting *setting) { const struct da8xx_ddrctl_config_knob *knob; int i; for (i = 0; i < ARRAY_SIZE(da8xx_ddrctl_knobs); i++) { knob = &da8xx_ddrctl_knobs[i]; if (strcmp(knob->name, setting->name) == 0) return knob; } return NULL; } static const struct da8xx_ddrctl_setting *da8xx_ddrctl_get_board_settings(void) { const struct da8xx_ddrctl_board_settings *board_settings; int i; for (i = 0; i < ARRAY_SIZE(da8xx_ddrctl_board_confs); i++) { board_settings = &da8xx_ddrctl_board_confs[i]; if (of_machine_is_compatible(board_settings->board)) return board_settings->settings; } return NULL; } static int da8xx_ddrctl_probe(struct platform_device *pdev) { const struct da8xx_ddrctl_config_knob *knob; const struct da8xx_ddrctl_setting *setting; struct device_node *node; struct resource *res; void __iomem *ddrctl; struct device *dev; u32 reg; dev = &pdev->dev; node = dev->of_node; setting = da8xx_ddrctl_get_board_settings(); if (!setting) { dev_err(dev, "no settings defined for this board\n"); return -EINVAL; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ddrctl = devm_ioremap_resource(dev, res); if (IS_ERR(ddrctl)) { dev_err(dev, "unable to map memory controller registers\n"); return PTR_ERR(ddrctl); } for (; setting->name; setting++) { knob = da8xx_ddrctl_match_knob(setting); if (!knob) { dev_warn(dev, "no such config option: %s\n", setting->name); continue; } if (knob->reg + sizeof(u32) > resource_size(res)) { dev_warn(dev, "register offset of '%s' exceeds mapped memory size\n", knob->name); continue; } reg = readl(ddrctl + knob->reg); reg &= knob->mask; reg |= setting->val << knob->shift; dev_dbg(dev, "writing 0x%08x to %s\n", reg, setting->name); writel(reg, ddrctl + knob->reg); } return 0; } static const struct of_device_id da8xx_ddrctl_of_match[] = { { .compatible = "ti,da850-ddr-controller", }, { }, }; static struct platform_driver da8xx_ddrctl_driver = { .probe = da8xx_ddrctl_probe, .driver = { .name = "da850-ddr-controller", .of_match_table = da8xx_ddrctl_of_match, }, }; module_platform_driver(da8xx_ddrctl_driver); MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>"); MODULE_DESCRIPTION("TI da8xx DDR2/mDDR controller driver"); MODULE_LICENSE("GPL v2");
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