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authorRoger Quadros <rogerq@ti.com>2015-08-06 13:21:40 +0300
committerRoger Quadros <rogerq@ti.com>2016-04-15 11:55:00 +0300
commit210325f0f4eb531f83ffb0b0f95612e2a8063983 (patch)
treeb433085564d9340632d9331ccfa64d859541873b /drivers/memory/omap-gpmc.c
parentd2d00862dfbbd22d80ee67f816cb7eeaea71f03b (diff)
downloadlinux-210325f0f4eb531f83ffb0b0f95612e2a8063983.tar.bz2
memory: omap-gpmc: Reserve WAITPIN if needed for WAIT monitoring
If the device attached to GPMC wants to use the WAIT pin for WAIT monitoring then we reserve it internally for exclusive use. Signed-off-by: Roger Quadros <rogerq@ti.com> Acked-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'drivers/memory/omap-gpmc.c')
-rw-r--r--drivers/memory/omap-gpmc.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index 4dd1c65ee70c..784a64f31a8b 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -1911,6 +1911,8 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
const char *name;
int ret, cs;
u32 val;
+ struct gpio_desc *waitpin_desc = NULL;
+ struct gpmc_device *gpmc = platform_get_drvdata(pdev);
if (of_property_read_u32(child, "reg", &cs) < 0) {
dev_err(&pdev->dev, "%s has no 'reg' property\n",
@@ -2020,16 +2022,30 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
goto err;
}
+ /* Reserve wait pin if it is required and valid */
+ if (gpmc_s.wait_on_read || gpmc_s.wait_on_write) {
+ unsigned int wait_pin = gpmc_s.wait_pin;
+
+ waitpin_desc = gpiochip_request_own_desc(&gpmc->gpio_chip,
+ wait_pin, "WAITPIN");
+ if (IS_ERR(waitpin_desc)) {
+ dev_err(&pdev->dev, "invalid wait-pin: %d\n", wait_pin);
+ ret = PTR_ERR(waitpin_desc);
+ goto err;
+ }
+ }
+
gpmc_cs_show_timings(cs, "before gpmc_cs_program_settings");
+
ret = gpmc_cs_program_settings(cs, &gpmc_s);
if (ret < 0)
- goto err;
+ goto err_cs;
ret = gpmc_cs_set_timings(cs, &gpmc_t, &gpmc_s);
if (ret) {
dev_err(&pdev->dev, "failed to set gpmc timings for: %s\n",
child->name);
- goto err;
+ goto err_cs;
}
/* Clear limited address i.e. enable A26-A11 */
@@ -2060,6 +2076,10 @@ err_child_fail:
dev_err(&pdev->dev, "failed to create gpmc child %s\n", child->name);
ret = -ENODEV;
+err_cs:
+ if (waitpin_desc)
+ gpiochip_free_own_desc(waitpin_desc);
+
err:
gpmc_cs_free(cs);