linux-kernel - [PATCH 22/36] ARM: OMAP2+: gmpc: add gpmc_generic

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Message-ID: <1402477001-31132-23-git-send-email-rogerq@ti.com>
Date:	Wed, 11 Jun 2014 11:56:27 +0300
From:	Roger Quadros <rogerq@...com>
To:	<tony@...mide.com>, <dwmw2@...radead.org>,
	<computersforpeace@...il.com>
CC:	<kyungmin.park@...sung.com>, <pekon@...com>,
	<ezequiel.garcia@...e-electrons.com>, <javier@...hile0.org>,
	<nsekhar@...com>, <linux-omap@...r.kernel.org>,
	<linux-mtd@...ts.infradead.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Roger Quadros <rogerq@...com>
Subject: [PATCH 22/36] ARM: OMAP2+: gmpc: add gpmc_generic_init()

This function populates platform data for the specified Chip Select.
It should be called by board init code.

Signed-off-by: Roger Quadros <rogerq@...com>
---
 arch/arm/mach-omap2/gpmc.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++
 arch/arm/mach-omap2/gpmc.h |  6 ++++
 2 files changed, 85 insertions(+)

diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index ee030cd..d3a64ed 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/pm_runtime.h>
+#include <linux/slab.h>
 
 #include <linux/platform_data/mtd-nand-omap2.h>
 
@@ -108,6 +109,8 @@
 
 #define GPMC_NR_WAITPINS		4
 
+static struct gpmc_omap_platform_data gpmc_pdata;
+
 /* Structure to save gpmc cs context */
 struct gpmc_cs_config {
 	u32 config1;
@@ -1510,6 +1513,82 @@ static int __init omap_gpmc_init(void)
 omap_postcore_initcall(omap_gpmc_init);
 
 /**
+ * gpmc_generic_init - Initialize platform data for a Chip Select
+ *
+ * @cs		chip select number
+ * @is_nand	true if device is NAND flash.
+ * @settings	GPMC settings
+ * @device_timings	device timings for device on this CS
+ * @gpmc_timings	GPMC timings
+ * @pdev	platform device for the device on this CS
+ * @pdata_size	platform data size for the platform device
+ */
+int gpmc_generic_init(int cs, bool is_nand,
+		      struct gpmc_settings *settings,
+		      struct gpmc_device_timings *device_timings,
+		      struct gpmc_timings *gpmc_timings,
+		      struct platform_device *pdev, unsigned pdata_size)
+{
+	struct gpmc_settings *gpmc_s = NULL;
+	struct gpmc_device_timings *gpmc_dev_t = NULL;
+	struct gpmc_timings *gpmc_t;
+
+	if (cs >= GPMC_CS_NUM) {
+		pr_err("%s: Invalid cs specified. Max CS = %d\n",
+		       __func__, GPMC_CS_NUM);
+		return -EINVAL;
+	}
+
+	if (gpmc_pdata.cs[cs].valid) {
+		pr_err("%s: cs %d already requested, ignoring new request\n",
+		       __func__, cs);
+		return -EINVAL;
+	}
+
+	if (settings) {
+		gpmc_s = kmemdup(settings, sizeof(*settings), GFP_KERNEL);
+		if (!gpmc_s)
+			return -ENOMEM;
+
+		gpmc_pdata.cs[cs].settings = gpmc_s;
+	}
+
+	if (device_timings) {
+		gpmc_dev_t = kmemdup(device_timings, sizeof(*device_timings),
+				     GFP_KERNEL);
+		if (!gpmc_dev_t)
+			goto dev_t_fail;
+
+		gpmc_pdata.cs[cs].device_timings = gpmc_dev_t;
+	}
+
+	if (gpmc_timings) {
+		gpmc_t = kmemdup(gpmc_timings, sizeof(*gpmc_timings),
+				 GFP_KERNEL);
+		if (!gpmc_t)
+			goto gpmc_t_fail;
+
+		gpmc_pdata.cs[cs].gpmc_timings = gpmc_t;
+	}
+
+	gpmc_pdata.cs[cs].is_nand = is_nand;
+	gpmc_pdata.cs[cs].pdev = pdev;
+	gpmc_pdata.cs[cs].pdata_size = pdata_size;
+	gpmc_pdata.cs[cs].valid = true;
+
+	return 0;
+
+gpmc_t_fail:
+	if (device_timings)
+		kfree(gpmc_dev_t);
+dev_t_fail:
+	if (settings)
+		kfree(gpmc_s);
+
+	return -ENOMEM;
+}
+
+/**
  * omap_gpmc_retime - Reconfigre GPMC timings for the device
  *
  * @cs		Chip select number
diff --git a/arch/arm/mach-omap2/gpmc.h b/arch/arm/mach-omap2/gpmc.h
index 6204913..301bc66 100644
--- a/arch/arm/mach-omap2/gpmc.h
+++ b/arch/arm/mach-omap2/gpmc.h
@@ -77,5 +77,11 @@ extern void omap3_gpmc_save_context(void);
 extern void omap3_gpmc_restore_context(void);
 extern void gpmc_read_settings_dt(struct device_node *np,
 				  struct gpmc_settings *p);
+int gpmc_generic_init(int cs, bool is_nand,
+		      struct gpmc_settings *settings,
+		      struct gpmc_device_timings *device_timings,
+		      struct gpmc_timings *gpmc_timings,
+		      struct platform_device *pdev,
+		      unsigned pdata_size);
 
 #endif
-- 
1.8.3.2

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