/* * EIM driver for Freescale's i.MX chips * * Copyright (C) 2013 Freescale Semiconductor, Inc. * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/module.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/of_device.h> #include <linux/mfd/syscon.h> #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> #include <linux/regmap.h> struct imx_weim_devtype { unsigned int cs_count; unsigned int cs_regs_count; unsigned int cs_stride; }; static const struct imx_weim_devtype imx1_weim_devtype = { .cs_count = 6, .cs_regs_count = 2, .cs_stride = 0x08, }; static const struct imx_weim_devtype imx27_weim_devtype = { .cs_count = 6, .cs_regs_count = 3, .cs_stride = 0x10, }; static const struct imx_weim_devtype imx50_weim_devtype = { .cs_count = 4, .cs_regs_count = 6, .cs_stride = 0x18, }; static const struct imx_weim_devtype imx51_weim_devtype = { .cs_count = 6, .cs_regs_count = 6, .cs_stride = 0x18, }; static const struct of_device_id weim_id_table[] = { /* i.MX1/21 */ { .compatible = "fsl,imx1-weim", .data = &imx1_weim_devtype, }, /* i.MX25/27/31/35 */ { .compatible = "fsl,imx27-weim", .data = &imx27_weim_devtype, }, /* i.MX50/53/6Q */ { .compatible = "fsl,imx50-weim", .data = &imx50_weim_devtype, }, { .compatible = "fsl,imx6q-weim", .data = &imx50_weim_devtype, }, /* i.MX51 */ { .compatible = "fsl,imx51-weim", .data = &imx51_weim_devtype, }, { } }; MODULE_DEVICE_TABLE(of, weim_id_table); static int __init imx_weim_gpr_setup(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct property *prop; const __be32 *p; struct regmap *gpr; u32 gprvals[4] = { 05, /* CS0(128M) CS1(0M) CS2(0M) CS3(0M) */ 033, /* CS0(64M) CS1(64M) CS2(0M) CS3(0M) */ 0113, /* CS0(64M) CS1(32M) CS2(32M) CS3(0M) */ 01111, /* CS0(32M) CS1(32M) CS2(32M) CS3(32M) */ }; u32 gprval = 0; u32 val; int cs = 0; int i = 0; gpr = syscon_regmap_lookup_by_phandle(np, "fsl,weim-cs-gpr"); if (IS_ERR(gpr)) { dev_dbg(&pdev->dev, "failed to find weim-cs-gpr\n"); return 0; } of_property_for_each_u32(np, "ranges", prop, p, val) { if (i % 4 == 0) { cs = val; } else if (i % 4 == 3 && val) { val = (val / SZ_32M) | 1; gprval |= val << cs * 3; } i++; } if (i == 0 || i % 4) goto err; for (i = 0; i < ARRAY_SIZE(gprvals); i++) { if (gprval == gprvals[i]) { /* Found it. Set up IOMUXC_GPR1[11:0] with it. */ regmap_update_bits(gpr, IOMUXC_GPR1, 0xfff, gprval); return 0; } } err: dev_err(&pdev->dev, "Invalid 'ranges' configuration\n"); return -EINVAL; } /* Parse and set the timing for this device. */ static int __init weim_timing_setup(struct device_node *np, void __iomem *base, const struct imx_weim_devtype *devtype) { u32 cs_idx, value[devtype->cs_regs_count]; int i, ret; /* get the CS index from this child node's "reg" property. */ ret = of_property_read_u32(np, "reg", &cs_idx); if (ret) return ret; if (cs_idx >= devtype->cs_count) return -EINVAL; ret = of_property_read_u32_array(np, "fsl,weim-cs-timing", value, devtype->cs_regs_count); if (ret) return ret; /* set the timing for WEIM */ for (i = 0; i < devtype->cs_regs_count; i++) writel(value[i], base + cs_idx * devtype->cs_stride + i * 4); return 0; } static int __init weim_parse_dt(struct platform_device *pdev, void __iomem *base) { const struct of_device_id *of_id = of_match_device(weim_id_table, &pdev->dev); const struct imx_weim_devtype *devtype = of_id->data; struct device_node *child; int ret, have_child = 0; if (devtype == &imx50_weim_devtype) { ret = imx_weim_gpr_setup(pdev); if (ret) return ret; } for_each_child_of_node(pdev->dev.of_node, child) { if (!child->name) continue; ret = weim_timing_setup(child, base, devtype); if (ret) dev_warn(&pdev->dev, "%s set timing failed.\n", child->full_name); else have_child = 1; } if (have_child) ret = of_platform_populate(pdev->dev.of_node, of_default_bus_match_table, NULL, &pdev->dev); if (ret) dev_err(&pdev->dev, "%s fail to create devices.\n", pdev->dev.of_node->full_name); return ret; } static int __init weim_probe(struct platform_device *pdev) { struct resource *res; struct clk *clk; void __iomem *base; int ret; /* get the resource */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(base)) return PTR_ERR(base); /* get the clock */ clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(clk)) return PTR_ERR(clk); ret = clk_prepare_enable(clk); if (ret) return ret; /* parse the device node */ ret = weim_parse_dt(pdev, base); if (ret) clk_disable_unprepare(clk); else dev_info(&pdev->dev, "Driver registered.\n"); return ret; } static struct platform_driver weim_driver = { .driver = { .name = "imx-weim", .of_match_table = weim_id_table, }, }; module_platform_driver_probe(weim_driver, weim_probe); MODULE_AUTHOR("Freescale Semiconductor Inc."); MODULE_DESCRIPTION("i.MX EIM Controller Driver"); MODULE_LICENSE("GPL");