diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/bus/imx-weim.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c new file mode 100644 index 000000000..6a94aa6a2 --- /dev/null +++ b/drivers/bus/imx-weim.c @@ -0,0 +1,221 @@ +/* + * 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, +}; + +#define MAX_CS_REGS_COUNT 6 + +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[MAX_CS_REGS_COUNT]; + int i, ret; + + if (WARN_ON(devtype->cs_regs_count > MAX_CS_REGS_COUNT)) + return -EINVAL; + + /* 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_available_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, "%pOF set timing failed.\n", + child); + else + have_child = 1; + } + + if (have_child) + ret = of_platform_default_populate(pdev->dev.of_node, + NULL, &pdev->dev); + if (ret) + dev_err(&pdev->dev, "%pOF fail to create devices.\n", + pdev->dev.of_node); + 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"); |