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- /*
- * 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;
- unsigned int wcr_offset;
- unsigned int wcr_bcm;
- };
- 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,
- .wcr_offset = 0x90,
- .wcr_bcm = BIT(0),
- };
- 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
- #define MAX_CS_COUNT 6
- #define OF_REG_SIZE 3
- struct cs_timing {
- bool is_applied;
- u32 regs[MAX_CS_REGS_COUNT];
- };
- struct cs_timing_state {
- struct cs_timing cs[MAX_CS_COUNT];
- };
- 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 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 weim_timing_setup(struct device *dev,
- struct device_node *np, void __iomem *base,
- const struct imx_weim_devtype *devtype,
- struct cs_timing_state *ts)
- {
- u32 cs_idx, value[MAX_CS_REGS_COUNT];
- int i, ret;
- int reg_idx, num_regs;
- struct cs_timing *cst;
- if (WARN_ON(devtype->cs_regs_count > MAX_CS_REGS_COUNT))
- return -EINVAL;
- if (WARN_ON(devtype->cs_count > MAX_CS_COUNT))
- return -EINVAL;
- ret = of_property_read_u32_array(np, "fsl,weim-cs-timing",
- value, devtype->cs_regs_count);
- if (ret)
- return ret;
- /*
- * the child node's "reg" property may contain multiple address ranges,
- * extract the chip select for each.
- */
- num_regs = of_property_count_elems_of_size(np, "reg", OF_REG_SIZE);
- if (num_regs < 0)
- return num_regs;
- if (!num_regs)
- return -EINVAL;
- for (reg_idx = 0; reg_idx < num_regs; reg_idx++) {
- /* get the CS index from this child node's "reg" property. */
- ret = of_property_read_u32_index(np, "reg",
- reg_idx * OF_REG_SIZE, &cs_idx);
- if (ret)
- break;
- if (cs_idx >= devtype->cs_count)
- return -EINVAL;
- /* prevent re-configuring a CS that's already been configured */
- cst = &ts->cs[cs_idx];
- if (cst->is_applied && memcmp(value, cst->regs,
- devtype->cs_regs_count * sizeof(u32))) {
- dev_err(dev, "fsl,weim-cs-timing conflict on %pOF", np);
- return -EINVAL;
- }
- /* 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);
- if (!cst->is_applied) {
- cst->is_applied = true;
- memcpy(cst->regs, value,
- devtype->cs_regs_count * sizeof(u32));
- }
- }
- return 0;
- }
- static int 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;
- struct cs_timing_state ts = {};
- u32 reg;
- if (devtype == &imx50_weim_devtype) {
- ret = imx_weim_gpr_setup(pdev);
- if (ret)
- return ret;
- }
- if (of_property_read_bool(pdev->dev.of_node, "fsl,burst-clk-enable")) {
- if (devtype->wcr_bcm) {
- reg = readl(base + devtype->wcr_offset);
- writel(reg | devtype->wcr_bcm,
- base + devtype->wcr_offset);
- } else {
- dev_err(&pdev->dev, "burst clk mode not supported.\n");
- return -EINVAL;
- }
- }
- for_each_available_child_of_node(pdev->dev.of_node, child) {
- ret = weim_timing_setup(&pdev->dev, child, base, devtype, &ts);
- 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 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,
- },
- .probe = weim_probe,
- };
- module_platform_driver(weim_driver);
- MODULE_AUTHOR("Freescale Semiconductor Inc.");
- MODULE_DESCRIPTION("i.MX EIM Controller Driver");
- MODULE_LICENSE("GPL");
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