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Diffstat (limited to 'arch/arm/mach-omap2/gpmc.c')
-rw-r--r--arch/arm/mach-omap2/gpmc.c82
1 files changed, 68 insertions, 14 deletions
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 6c4da1254f53..1c7969e965d7 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -30,6 +30,7 @@
#include <linux/of_mtd.h>
#include <linux/of_device.h>
#include <linux/mtd/nand.h>
+#include <linux/pm_runtime.h>
#include <linux/platform_data/mtd-nand-omap2.h>
@@ -155,6 +156,7 @@ static struct resource gpmc_cs_mem[GPMC_CS_NUM];
static DEFINE_SPINLOCK(gpmc_mem_lock);
/* Define chip-selects as reserved by default until probe completes */
static unsigned int gpmc_cs_map = ((1 << GPMC_CS_NUM) - 1);
+static unsigned int gpmc_cs_num = GPMC_CS_NUM;
static unsigned int gpmc_nr_waitpins;
static struct device *gpmc_dev;
static int gpmc_irq;
@@ -521,8 +523,10 @@ static int gpmc_cs_remap(int cs, u32 base)
int ret;
u32 old_base, size;
- if (cs > GPMC_CS_NUM)
+ if (cs > gpmc_cs_num) {
+ pr_err("%s: requested chip-select is disabled\n", __func__);
return -ENODEV;
+ }
gpmc_cs_get_memconf(cs, &old_base, &size);
if (base == old_base)
return 0;
@@ -545,9 +549,10 @@ int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
struct resource *res = &gpmc_cs_mem[cs];
int r = -1;
- if (cs > GPMC_CS_NUM)
+ if (cs > gpmc_cs_num) {
+ pr_err("%s: requested chip-select is disabled\n", __func__);
return -ENODEV;
-
+ }
size = gpmc_mem_align(size);
if (size > (1 << GPMC_SECTION_SHIFT))
return -ENOMEM;
@@ -582,7 +587,7 @@ EXPORT_SYMBOL(gpmc_cs_request);
void gpmc_cs_free(int cs)
{
spin_lock(&gpmc_mem_lock);
- if (cs >= GPMC_CS_NUM || cs < 0 || !gpmc_cs_reserved(cs)) {
+ if (cs >= gpmc_cs_num || cs < 0 || !gpmc_cs_reserved(cs)) {
printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs);
BUG();
spin_unlock(&gpmc_mem_lock);
@@ -777,7 +782,7 @@ static void gpmc_mem_exit(void)
{
int cs;
- for (cs = 0; cs < GPMC_CS_NUM; cs++) {
+ for (cs = 0; cs < gpmc_cs_num; cs++) {
if (!gpmc_cs_mem_enabled(cs))
continue;
gpmc_cs_delete_mem(cs);
@@ -798,7 +803,7 @@ static void gpmc_mem_init(void)
gpmc_mem_root.end = GPMC_MEM_END;
/* Reserve all regions that has been set up by bootloader */
- for (cs = 0; cs < GPMC_CS_NUM; cs++) {
+ for (cs = 0; cs < gpmc_cs_num; cs++) {
u32 base, size;
if (!gpmc_cs_mem_enabled(cs))
@@ -1245,7 +1250,6 @@ void gpmc_read_settings_dt(struct device_node *np, struct gpmc_settings *p)
p->sync_read = of_property_read_bool(np, "gpmc,sync-read");
p->sync_write = of_property_read_bool(np, "gpmc,sync-write");
- p->device_nand = of_property_read_bool(np, "gpmc,device-nand");
of_property_read_u32(np, "gpmc,device-width", &p->device_width);
of_property_read_u32(np, "gpmc,mux-add-data", &p->mux_add_data);
@@ -1345,6 +1349,13 @@ static const char * const nand_ecc_opts[] = {
[OMAP_ECC_BCH8_CODE_HW] = "bch8",
};
+static const char * const nand_xfer_types[] = {
+ [NAND_OMAP_PREFETCH_POLLED] = "prefetch-polled",
+ [NAND_OMAP_POLLED] = "polled",
+ [NAND_OMAP_PREFETCH_DMA] = "prefetch-dma",
+ [NAND_OMAP_PREFETCH_IRQ] = "prefetch-irq",
+};
+
static int gpmc_probe_nand_child(struct platform_device *pdev,
struct device_node *child)
{
@@ -1374,6 +1385,13 @@ static int gpmc_probe_nand_child(struct platform_device *pdev,
break;
}
+ if (!of_property_read_string(child, "ti,nand-xfer-type", &s))
+ for (val = 0; val < ARRAY_SIZE(nand_xfer_types); val++)
+ if (!strcasecmp(s, nand_xfer_types[val])) {
+ gpmc_nand_data->xfer_type = val;
+ break;
+ }
+
val = of_get_nand_bus_width(child);
if (val == 16)
gpmc_nand_data->devsize = NAND_BUSWIDTH_16;
@@ -1513,6 +1531,20 @@ static int gpmc_probe_dt(struct platform_device *pdev)
if (!of_id)
return 0;
+ ret = of_property_read_u32(pdev->dev.of_node, "gpmc,num-cs",
+ &gpmc_cs_num);
+ if (ret < 0) {
+ pr_err("%s: number of chip-selects not defined\n", __func__);
+ return ret;
+ } else if (gpmc_cs_num < 1) {
+ pr_err("%s: all chip-selects are disabled\n", __func__);
+ return -EINVAL;
+ } else if (gpmc_cs_num > GPMC_CS_NUM) {
+ pr_err("%s: number of supported chip-selects cannot be > %d\n",
+ __func__, GPMC_CS_NUM);
+ return -EINVAL;
+ }
+
ret = of_property_read_u32(pdev->dev.of_node, "gpmc,num-waitpins",
&gpmc_nr_waitpins);
if (ret < 0) {
@@ -1577,7 +1609,8 @@ static int gpmc_probe(struct platform_device *pdev)
return PTR_ERR(gpmc_l3_clk);
}
- clk_prepare_enable(gpmc_l3_clk);
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
gpmc_dev = &pdev->dev;
@@ -1610,12 +1643,14 @@ static int gpmc_probe(struct platform_device *pdev)
/* Now the GPMC is initialised, unreserve the chip-selects */
gpmc_cs_map = 0;
- if (!pdev->dev.of_node)
+ if (!pdev->dev.of_node) {
+ gpmc_cs_num = GPMC_CS_NUM;
gpmc_nr_waitpins = GPMC_NR_WAITPINS;
+ }
rc = gpmc_probe_dt(pdev);
if (rc < 0) {
- clk_disable_unprepare(gpmc_l3_clk);
+ pm_runtime_put_sync(&pdev->dev);
clk_put(gpmc_l3_clk);
dev_err(gpmc_dev, "failed to probe DT parameters\n");
return rc;
@@ -1628,10 +1663,30 @@ static int gpmc_remove(struct platform_device *pdev)
{
gpmc_free_irq();
gpmc_mem_exit();
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
gpmc_dev = NULL;
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int gpmc_suspend(struct device *dev)
+{
+ omap3_gpmc_save_context();
+ pm_runtime_put_sync(dev);
+ return 0;
+}
+
+static int gpmc_resume(struct device *dev)
+{
+ pm_runtime_get_sync(dev);
+ omap3_gpmc_restore_context();
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(gpmc_pm_ops, gpmc_suspend, gpmc_resume);
+
static struct platform_driver gpmc_driver = {
.probe = gpmc_probe,
.remove = gpmc_remove,
@@ -1639,6 +1694,7 @@ static struct platform_driver gpmc_driver = {
.name = DEVICE_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(gpmc_dt_ids),
+ .pm = &gpmc_pm_ops,
},
};
@@ -1701,7 +1757,6 @@ static irqreturn_t gpmc_handle_irq(int irq, void *dev)
return IRQ_HANDLED;
}
-#ifdef CONFIG_ARCH_OMAP3
static struct omap3_gpmc_regs gpmc_context;
void omap3_gpmc_save_context(void)
@@ -1715,7 +1770,7 @@ void omap3_gpmc_save_context(void)
gpmc_context.prefetch_config1 = gpmc_read_reg(GPMC_PREFETCH_CONFIG1);
gpmc_context.prefetch_config2 = gpmc_read_reg(GPMC_PREFETCH_CONFIG2);
gpmc_context.prefetch_control = gpmc_read_reg(GPMC_PREFETCH_CONTROL);
- for (i = 0; i < GPMC_CS_NUM; i++) {
+ for (i = 0; i < gpmc_cs_num; i++) {
gpmc_context.cs_context[i].is_valid = gpmc_cs_mem_enabled(i);
if (gpmc_context.cs_context[i].is_valid) {
gpmc_context.cs_context[i].config1 =
@@ -1747,7 +1802,7 @@ void omap3_gpmc_restore_context(void)
gpmc_write_reg(GPMC_PREFETCH_CONFIG1, gpmc_context.prefetch_config1);
gpmc_write_reg(GPMC_PREFETCH_CONFIG2, gpmc_context.prefetch_config2);
gpmc_write_reg(GPMC_PREFETCH_CONTROL, gpmc_context.prefetch_control);
- for (i = 0; i < GPMC_CS_NUM; i++) {
+ for (i = 0; i < gpmc_cs_num; i++) {
if (gpmc_context.cs_context[i].is_valid) {
gpmc_cs_write_reg(i, GPMC_CS_CONFIG1,
gpmc_context.cs_context[i].config1);
@@ -1766,4 +1821,3 @@ void omap3_gpmc_restore_context(void)
}
}
}
-#endif /* CONFIG_ARCH_OMAP3 */
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-16 01:51:11 +0000