@@ -553,6 +553,7 @@ config STE_DMA40
bool "ST-Ericsson DMA40 support"
depends on ARCH_U8500
select DMA_ENGINE
+ select SRAM
help
Support for ST-Ericsson DMA40 controller
@@ -19,6 +19,7 @@
#include <linux/pm_runtime.h>
#include <linux/err.h>
#include <linux/of.h>
+#include <linux/of_address.h>
#include <linux/of_dma.h>
#include <linux/amba/bus.h>
#include <linux/regulator/consumer.h>
@@ -3506,9 +3507,11 @@ static int __init d40_probe(struct platform_device *pdev)
{
struct stedma40_platform_data *plat_data = dev_get_platdata(&pdev->dev);
struct device_node *np = pdev->dev.of_node;
+ struct device_node *np_lcpa;
int ret = -ENOENT;
struct d40_base *base;
struct resource *res;
+ struct resource res_lcpa;
int num_reserved_chans;
u32 val;
@@ -3535,37 +3538,37 @@ static int __init d40_probe(struct platform_device *pdev)
spin_lock_init(&base->interrupt_lock);
spin_lock_init(&base->execmd_lock);
- /* Get IO for logical channel parameter address */
- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcpa");
- if (!res) {
- ret = -ENOENT;
- d40_err(&pdev->dev, "No \"lcpa\" memory resource\n");
- goto destroy_cache;
+ /* Get IO for logical channel parameter address (LCPA) */
+ np_lcpa = of_parse_phandle(np, "sram", 0);
+ if (!np_lcpa) {
+ dev_err(&pdev->dev, "no LCPA SRAM node\n");
+ goto report_failure;
}
- base->lcpa_size = resource_size(res);
- base->phy_lcpa = res->start;
-
- if (request_mem_region(res->start, resource_size(res),
- D40_NAME " I/O lcpa") == NULL) {
- ret = -EBUSY;
- d40_err(&pdev->dev, "Failed to request LCPA region %pR\n", res);
- goto destroy_cache;
+ /* This is no device so read the address directly from the node */
+ ret = of_address_to_resource(np_lcpa, 0, &res_lcpa);
+ if (ret) {
+ dev_err(&pdev->dev, "no LCPA SRAM resource\n");
+ goto report_failure;
}
+ base->lcpa_size = resource_size(&res_lcpa);
+ base->phy_lcpa = res_lcpa.start;
+ dev_info(&pdev->dev, "found LCPA SRAM at 0x%08x, size 0x%08x\n",
+ base->phy_lcpa, base->lcpa_size);
/* We make use of ESRAM memory for this. */
val = readl(base->virtbase + D40_DREG_LCPA);
- if (res->start != val && val != 0) {
+ if (base->phy_lcpa != val && val != 0) {
dev_warn(&pdev->dev,
- "[%s] Mismatch LCPA dma 0x%x, def %pa\n",
- __func__, val, &res->start);
+ "[%s] Mismatch LCPA dma 0x%x, def %08x\n",
+ __func__, val, base->phy_lcpa);
} else
- writel(res->start, base->virtbase + D40_DREG_LCPA);
+ writel(base->phy_lcpa, base->virtbase + D40_DREG_LCPA);
- base->lcpa_base = ioremap(res->start, resource_size(res));
+ base->lcpa_base = ioremap(base->phy_lcpa, base->lcpa_size);
if (!base->lcpa_base) {
ret = -ENOMEM;
d40_err(&pdev->dev, "Failed to ioremap LCPA region\n");
- goto destroy_cache;
+ goto release_base;
}
/* If lcla has to be located in ESRAM we don't need to allocate */
if (base->plat_data->use_esram_lcla) {
@@ -3678,9 +3681,7 @@ static int __init d40_probe(struct platform_device *pdev)
if (base->lcpa_base)
iounmap(base->lcpa_base);
- if (base->phy_lcpa)
- release_mem_region(base->phy_lcpa,
- base->lcpa_size);
+release_base:
if (base->phy_start)
release_mem_region(base->phy_start,
base->phy_size);
Instead of passing the reserved SRAM as a "reg" field look for a phandle to the LCPA SRAM memory so we can use the proper SRAM device tree bindings for the SRAM. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> --- drivers/dma/Kconfig | 1 + drivers/dma/ste_dma40.c | 47 ++++++++++++++++++++++++----------------------- 2 files changed, 25 insertions(+), 23 deletions(-)