#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_mtd.h>
+#include <linux/of_device.h>
+#include <linux/mtd/nand.h>
#include <linux/platform_data/mtd-nand-omap2.h>
#include "common.h"
#include "omap_device.h"
#include "gpmc.h"
+#include "gpmc-nand.h"
+#include "gpmc-onenand.h"
#define DEVICE_NAME "omap-gpmc"
static struct resource gpmc_mem_root;
static struct resource gpmc_cs_mem[GPMC_CS_NUM];
static DEFINE_SPINLOCK(gpmc_mem_lock);
-static unsigned int gpmc_cs_map; /* flag for cs which are initialized */
+/* Define chip-selects as reserved by default until probe completes */
+static unsigned int gpmc_cs_map = ((1 << GPMC_CS_NUM) - 1);
static struct device *gpmc_dev;
static int gpmc_irq;
static resource_size_t phys_base, mem_size;
/* TODO: remove, see function definition */
gpmc_convert_ps_to_ns(gpmc_t);
+ /* Now the GPMC is initialised, unreserve the chip-selects */
+ gpmc_cs_map = 0;
+
return 0;
}
+#ifdef CONFIG_OF
+static struct of_device_id gpmc_dt_ids[] = {
+ { .compatible = "ti,omap2420-gpmc" },
+ { .compatible = "ti,omap2430-gpmc" },
+ { .compatible = "ti,omap3430-gpmc" }, /* omap3430 & omap3630 */
+ { .compatible = "ti,omap4430-gpmc" }, /* omap4430 & omap4460 & omap543x */
+ { .compatible = "ti,am3352-gpmc" }, /* am335x devices */
+ { }
+};
+MODULE_DEVICE_TABLE(of, gpmc_dt_ids);
+
+static void __maybe_unused gpmc_read_timings_dt(struct device_node *np,
+ struct gpmc_timings *gpmc_t)
+{
+ u32 val;
+
+ memset(gpmc_t, 0, sizeof(*gpmc_t));
+
+ /* minimum clock period for syncronous mode */
+ if (!of_property_read_u32(np, "gpmc,sync-clk", &val))
+ gpmc_t->sync_clk = val;
+
+ /* chip select timtings */
+ if (!of_property_read_u32(np, "gpmc,cs-on", &val))
+ gpmc_t->cs_on = val;
+
+ if (!of_property_read_u32(np, "gpmc,cs-rd-off", &val))
+ gpmc_t->cs_rd_off = val;
+
+ if (!of_property_read_u32(np, "gpmc,cs-wr-off", &val))
+ gpmc_t->cs_wr_off = val;
+
+ /* ADV signal timings */
+ if (!of_property_read_u32(np, "gpmc,adv-on", &val))
+ gpmc_t->adv_on = val;
+
+ if (!of_property_read_u32(np, "gpmc,adv-rd-off", &val))
+ gpmc_t->adv_rd_off = val;
+
+ if (!of_property_read_u32(np, "gpmc,adv-wr-off", &val))
+ gpmc_t->adv_wr_off = val;
+
+ /* WE signal timings */
+ if (!of_property_read_u32(np, "gpmc,we-on", &val))
+ gpmc_t->we_on = val;
+
+ if (!of_property_read_u32(np, "gpmc,we-off", &val))
+ gpmc_t->we_off = val;
+
+ /* OE signal timings */
+ if (!of_property_read_u32(np, "gpmc,oe-on", &val))
+ gpmc_t->oe_on = val;
+
+ if (!of_property_read_u32(np, "gpmc,oe-off", &val))
+ gpmc_t->oe_off = val;
+
+ /* access and cycle timings */
+ if (!of_property_read_u32(np, "gpmc,page-burst-access", &val))
+ gpmc_t->page_burst_access = val;
+
+ if (!of_property_read_u32(np, "gpmc,access", &val))
+ gpmc_t->access = val;
+
+ if (!of_property_read_u32(np, "gpmc,rd-cycle", &val))
+ gpmc_t->rd_cycle = val;
+
+ if (!of_property_read_u32(np, "gpmc,wr-cycle", &val))
+ gpmc_t->wr_cycle = val;
+
+ /* only for OMAP3430 */
+ if (!of_property_read_u32(np, "gpmc,wr-access", &val))
+ gpmc_t->wr_access = val;
+
+ if (!of_property_read_u32(np, "gpmc,wr-data-mux-bus", &val))
+ gpmc_t->wr_data_mux_bus = val;
+}
+
+#ifdef CONFIG_MTD_NAND
+
+static const char * const nand_ecc_opts[] = {
+ [OMAP_ECC_HAMMING_CODE_DEFAULT] = "sw",
+ [OMAP_ECC_HAMMING_CODE_HW] = "hw",
+ [OMAP_ECC_HAMMING_CODE_HW_ROMCODE] = "hw-romcode",
+ [OMAP_ECC_BCH4_CODE_HW] = "bch4",
+ [OMAP_ECC_BCH8_CODE_HW] = "bch8",
+};
+
+static int gpmc_probe_nand_child(struct platform_device *pdev,
+ struct device_node *child)
+{
+ u32 val;
+ const char *s;
+ struct gpmc_timings gpmc_t;
+ struct omap_nand_platform_data *gpmc_nand_data;
+
+ if (of_property_read_u32(child, "reg", &val) < 0) {
+ dev_err(&pdev->dev, "%s has no 'reg' property\n",
+ child->full_name);
+ return -ENODEV;
+ }
+
+ gpmc_nand_data = devm_kzalloc(&pdev->dev, sizeof(*gpmc_nand_data),
+ GFP_KERNEL);
+ if (!gpmc_nand_data)
+ return -ENOMEM;
+
+ gpmc_nand_data->cs = val;
+ gpmc_nand_data->of_node = child;
+
+ if (!of_property_read_string(child, "ti,nand-ecc-opt", &s))
+ for (val = 0; val < ARRAY_SIZE(nand_ecc_opts); val++)
+ if (!strcasecmp(s, nand_ecc_opts[val])) {
+ gpmc_nand_data->ecc_opt = val;
+ break;
+ }
+
+ val = of_get_nand_bus_width(child);
+ if (val == 16)
+ gpmc_nand_data->devsize = NAND_BUSWIDTH_16;
+
+ gpmc_read_timings_dt(child, &gpmc_t);
+ gpmc_nand_init(gpmc_nand_data, &gpmc_t);
+
+ return 0;
+}
+#else
+static int gpmc_probe_nand_child(struct platform_device *pdev,
+ struct device_node *child)
+{
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_MTD_ONENAND
+static int gpmc_probe_onenand_child(struct platform_device *pdev,
+ struct device_node *child)
+{
+ u32 val;
+ struct omap_onenand_platform_data *gpmc_onenand_data;
+
+ if (of_property_read_u32(child, "reg", &val) < 0) {
+ dev_err(&pdev->dev, "%s has no 'reg' property\n",
+ child->full_name);
+ return -ENODEV;
+ }
+
+ gpmc_onenand_data = devm_kzalloc(&pdev->dev, sizeof(*gpmc_onenand_data),
+ GFP_KERNEL);
+ if (!gpmc_onenand_data)
+ return -ENOMEM;
+
+ gpmc_onenand_data->cs = val;
+ gpmc_onenand_data->of_node = child;
+ gpmc_onenand_data->dma_channel = -1;
+
+ if (!of_property_read_u32(child, "dma-channel", &val))
+ gpmc_onenand_data->dma_channel = val;
+
+ gpmc_onenand_init(gpmc_onenand_data);
+
+ return 0;
+}
+#else
+static int gpmc_probe_onenand_child(struct platform_device *pdev,
+ struct device_node *child)
+{
+ return 0;
+}
+#endif
+
+static int gpmc_probe_dt(struct platform_device *pdev)
+{
+ int ret;
+ struct device_node *child;
+ const struct of_device_id *of_id =
+ of_match_device(gpmc_dt_ids, &pdev->dev);
+
+ if (!of_id)
+ return 0;
+
+ for_each_node_by_name(child, "nand") {
+ ret = gpmc_probe_nand_child(pdev, child);
+ if (ret < 0) {
+ of_node_put(child);
+ return ret;
+ }
+ }
+
+ for_each_node_by_name(child, "onenand") {
+ ret = gpmc_probe_onenand_child(pdev, child);
+ if (ret < 0) {
+ of_node_put(child);
+ return ret;
+ }
+ }
+ return 0;
+}
+#else
+static int gpmc_probe_dt(struct platform_device *pdev)
+{
+ return 0;
+}
+#endif
+
static int gpmc_probe(struct platform_device *pdev)
{
int rc;
if (IS_ERR_VALUE(gpmc_setup_irq()))
dev_warn(gpmc_dev, "gpmc_setup_irq failed\n");
+ rc = gpmc_probe_dt(pdev);
+ if (rc < 0) {
+ clk_disable_unprepare(gpmc_l3_clk);
+ clk_put(gpmc_l3_clk);
+ dev_err(gpmc_dev, "failed to probe DT parameters\n");
+ return rc;
+ }
+
return 0;
}
.driver = {
.name = DEVICE_NAME,
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(gpmc_dt_ids),
},
};
struct platform_device *pdev;
char *oh_name = "gpmc";
+ /*
+ * if the board boots up with a populated DT, do not
+ * manually add the device from this initcall
+ */
+ if (of_have_populated_dt())
+ return -ENODEV;
+
oh = omap_hwmod_lookup(oh_name);
if (!oh) {
pr_err("Could not look up %s\n", oh_name);
projects / firefly-linux-kernel-4.4.55.git / blobdiff