linux-kernel - [PATCH v2 1/7] uio: uio_pruss: replace private SRAM API with genalloc

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Date:	Fri, 28 Sep 2012 15:37:46 -0400
From:	Matt Porter <mporter@...com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Hans J. Koch" <hjk@...sjkoch.de>,
	Benoit Cousson <b-cousson@...com>,
	Paul Walmsley <paul@...an.com>, Sekhar Nori <nsekhar@...com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>
Subject: [PATCH v2 1/7] uio: uio_pruss: replace private SRAM API with genalloc

Remove the use of the private DaVinci SRAM API in favor
of genalloc. The pool to be used is provided by platform
data.

Signed-off-by: Matt Porter <mporter@...com>
---
 drivers/uio/Kconfig                     |    1 +
 drivers/uio/uio_pruss.c                 |   24 +++++++++++++++++-------
 include/linux/platform_data/uio_pruss.h |    3 ++-
 3 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
index 6f3ea9b..c48b938 100644
--- a/drivers/uio/Kconfig
+++ b/drivers/uio/Kconfig
@@ -97,6 +97,7 @@ config UIO_NETX
 config UIO_PRUSS
 	tristate "Texas Instruments PRUSS driver"
 	depends on ARCH_DAVINCI_DA850
+	select GENERIC_ALLOCATOR
 	help
 	  PRUSS driver for OMAPL138/DA850/AM18XX devices
 	  PRUSS driver requires user space components, examples and user space
diff --git a/drivers/uio/uio_pruss.c b/drivers/uio/uio_pruss.c
index 33a7a27..1b55db3 100644
--- a/drivers/uio/uio_pruss.c
+++ b/drivers/uio/uio_pruss.c
@@ -25,7 +25,7 @@
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
-#include <mach/sram.h>
+#include <linux/genalloc.h>
 
 #define DRV_NAME "pruss_uio"
 #define DRV_VERSION "1.0"
@@ -65,10 +65,11 @@ struct uio_pruss_dev {
 	dma_addr_t sram_paddr;
 	dma_addr_t ddr_paddr;
 	void __iomem *prussio_vaddr;
-	void *sram_vaddr;
+	unsigned long sram_vaddr;
 	void *ddr_vaddr;
 	unsigned int hostirq_start;
 	unsigned int pintc_base;
+	struct gen_pool *sram_pool;
 };
 
 static irqreturn_t pruss_handler(int irq, struct uio_info *info)
@@ -106,7 +107,9 @@ static void pruss_cleanup(struct platform_device *dev,
 			gdev->ddr_paddr);
 	}
 	if (gdev->sram_vaddr)
-		sram_free(gdev->sram_vaddr, sram_pool_sz);
+		gen_pool_free(gdev->sram_pool,
+			      gdev->sram_vaddr,
+			      sram_pool_sz);
 	kfree(gdev->info);
 	clk_put(gdev->pruss_clk);
 	kfree(gdev);
@@ -152,10 +155,17 @@ static int __devinit pruss_probe(struct platform_device *dev)
 		goto out_free;
 	}
 
-	gdev->sram_vaddr = sram_alloc(sram_pool_sz, &(gdev->sram_paddr));
-	if (!gdev->sram_vaddr) {
-		dev_err(&dev->dev, "Could not allocate SRAM pool\n");
-		goto out_free;
+	if (pdata->l3ram_pool) {
+		gdev->sram_pool = pdata->l3ram_pool;
+		gdev->sram_vaddr =
+			gen_pool_alloc(gdev->sram_pool, sram_pool_sz);
+		if (!gdev->sram_vaddr) {
+			dev_err(&dev->dev, "Could not allocate SRAM pool\n");
+			goto out_free;
+		}
+		gdev->sram_paddr =
+			gen_pool_virt_to_phys(gdev->sram_pool,
+					      gdev->sram_vaddr);
 	}
 
 	gdev->ddr_vaddr = dma_alloc_coherent(&dev->dev, extram_pool_sz,
diff --git a/include/linux/platform_data/uio_pruss.h b/include/linux/platform_data/uio_pruss.h
index f39140a..e500fe6 100644
--- a/include/linux/platform_data/uio_pruss.h
+++ b/include/linux/platform_data/uio_pruss.h
@@ -20,6 +20,7 @@
 
 /* To configure the PRUSS INTC base offset for UIO driver */
 struct uio_pruss_pdata {
-	u32	pintc_base;
+	u32		pintc_base;
+	struct gen_pool *l3ram_pool;
 };
 #endif /* _UIO_PRUSS_H_ */
-- 
1.7.9.5

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