#include <linux/io.h>
#include <linux/of_device.h>
-struct imx_weim {
- void __iomem *base;
- struct clk *clk;
+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[] = {
- { .compatible = "fsl,imx6q-weim", },
- {}
+ /* 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);
-#define CS_TIMING_LEN 6
-#define CS_REG_RANGE 0x18
-
/* Parse and set the timing for this device. */
-static int
-weim_timing_setup(struct platform_device *pdev, struct device_node *np)
+static int __init weim_timing_setup(struct device_node *np, void __iomem *base,
+ const struct imx_weim_devtype *devtype)
{
- struct imx_weim *weim = platform_get_drvdata(pdev);
- u32 value[CS_TIMING_LEN];
- u32 cs_idx;
- int ret;
- int i;
+ 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;
- /* The weim has four chip selects. */
- if (cs_idx > 3)
+ if (cs_idx >= devtype->cs_count)
return -EINVAL;
ret = of_property_read_u32_array(np, "fsl,weim-cs-timing",
- value, CS_TIMING_LEN);
+ value, devtype->cs_regs_count);
if (ret)
return ret;
/* set the timing for WEIM */
- for (i = 0; i < CS_TIMING_LEN; i++)
- writel(value[i], weim->base + cs_idx * CS_REG_RANGE + i * 4);
+ for (i = 0; i < devtype->cs_regs_count; i++)
+ writel(value[i], base + cs_idx * devtype->cs_stride + i * 4);
+
return 0;
}
-static int weim_parse_dt(struct platform_device *pdev)
+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;
if (!child->name)
continue;
- ret = weim_timing_setup(pdev, child);
+ ret = weim_timing_setup(child, base, devtype);
if (ret) {
dev_err(&pdev->dev, "%s set timing failed.\n",
child->full_name);
return ret;
}
-static int weim_probe(struct platform_device *pdev)
+static int __init weim_probe(struct platform_device *pdev)
{
- struct imx_weim *weim;
struct resource *res;
- int ret = -EINVAL;
-
- weim = devm_kzalloc(&pdev->dev, sizeof(*weim), GFP_KERNEL);
- if (!weim) {
- ret = -ENOMEM;
- goto weim_err;
- }
- platform_set_drvdata(pdev, weim);
+ struct clk *clk;
+ void __iomem *base;
+ int ret;
/* get the resource */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- weim->base = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(weim->base)) {
- ret = PTR_ERR(weim->base);
- goto weim_err;
- }
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
/* get the clock */
- weim->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(weim->clk))
- goto weim_err;
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
- ret = clk_prepare_enable(weim->clk);
+ ret = clk_prepare_enable(clk);
if (ret)
- goto weim_err;
+ return ret;
/* parse the device node */
- ret = weim_parse_dt(pdev);
- if (ret) {
- clk_disable_unprepare(weim->clk);
- goto weim_err;
- }
-
- dev_info(&pdev->dev, "WEIM driver registered.\n");
- return 0;
+ ret = weim_parse_dt(pdev, base);
+ if (ret)
+ clk_disable_unprepare(clk);
+ else
+ dev_info(&pdev->dev, "Driver registered.\n");
-weim_err:
return ret;
}
static struct platform_driver weim_driver = {
.driver = {
- .name = "imx-weim",
- .of_match_table = weim_id_table,
+ .name = "imx-weim",
+ .owner = THIS_MODULE,
+ .of_match_table = weim_id_table,
},
- .probe = weim_probe,
};
+module_platform_driver_probe(weim_driver, weim_probe);
-module_platform_driver(weim_driver);
MODULE_AUTHOR("Freescale Semiconductor Inc.");
MODULE_DESCRIPTION("i.MX EIM Controller Driver");
MODULE_LICENSE("GPL");
projects / ~andy / linux / blobdiff