brcm2708: remove linux 4.4 support

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 0 insertions, 170 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0168-bcm2835-mmc-Only-claim-one-DMA-channel.patch b/target/linux/brcm2708/patches-4.4/0168-bcm2835-mmc-Only-claim-one-DMA-channel.patch
deleted file mode 100644
index c4f5f8f978..0000000000
--- a/target/linux/brcm2708/patches-4.4/0168-bcm2835-mmc-Only-claim-one-DMA-channel.patch
+++ /dev/null
@@ -1,170 +0,0 @@
-From 73271a952afe1a9ba51421478e69e95d5993e65b Mon Sep 17 00:00:00 2001
-From: Phil Elwell <phil@raspberrypi.org>
-Date: Tue, 8 Mar 2016 09:49:16 +0000
-Subject: [PATCH] bcm2835-mmc: Only claim one DMA channel
-
-With both MMC controllers enabled there are few DMA channels left. The
-bcm2835-mmc driver only uses DMA in one direction at a time, so it
-doesn't need to claim two channels.
-
-See: https://github.com/raspberrypi/linux/issues/1327
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
----
- arch/arm/boot/dts/bcm2708_common.dtsi |  5 +--
- drivers/mmc/host/bcm2835-mmc.c        | 69 +++++++++++++++++++++++++----------
- 2 files changed, 51 insertions(+), 23 deletions(-)
-
---- a/arch/arm/boot/dts/bcm2708_common.dtsi
-+++ b/arch/arm/boot/dts/bcm2708_common.dtsi
-@@ -232,9 +232,8 @@
- 			reg = <0x7e300000 0x100>;
- 			interrupts = <2 30>;
- 			clocks = <&clk_mmc>;
--			dmas = <&dma 11>,
--			       <&dma 11>;
--			dma-names = "tx", "rx";
-+			dmas = <&dma 11>;
-+			dma-names = "rx-tx";
- 			brcm,overclock-50 = <0>;
- 			status = "disabled";
- 		};
---- a/drivers/mmc/host/bcm2835-mmc.c
-+++ b/drivers/mmc/host/bcm2835-mmc.c
-@@ -108,8 +108,9 @@ struct bcm2835_host {
- 	u32						shadow;
- 
- 	/*DMA part*/
--	struct dma_chan			*dma_chan_rx;		/* DMA channel for reads */
--	struct dma_chan			*dma_chan_tx;		/* DMA channel for writes */
-+	struct dma_chan			*dma_chan_rxtx;		/* DMA channel for reads and writes */
-+	struct dma_slave_config		dma_cfg_rx;
-+	struct dma_slave_config		dma_cfg_tx;
- 	struct dma_async_tx_descriptor	*tx_desc;	/* descriptor */
- 
- 	bool					have_dma;
-@@ -342,7 +343,7 @@ static void bcm2835_mmc_dma_complete(voi
- 
- 	if (host->data && !(host->data->flags & MMC_DATA_WRITE)) {
- 		/* otherwise handled in SDHCI IRQ */
--		dma_chan = host->dma_chan_rx;
-+		dma_chan = host->dma_chan_rxtx;
- 		dir_data = DMA_FROM_DEVICE;
- 
- 		dma_unmap_sg(dma_chan->device->dev,
-@@ -493,16 +494,21 @@ static void bcm2835_mmc_transfer_dma(str
- 	if (host->blocks == 0)
- 		return;
- 
-+	dma_chan = host->dma_chan_rxtx;
- 	if (host->data->flags & MMC_DATA_READ) {
--		dma_chan = host->dma_chan_rx;
- 		dir_data = DMA_FROM_DEVICE;
- 		dir_slave = DMA_DEV_TO_MEM;
- 	} else {
--		dma_chan = host->dma_chan_tx;
- 		dir_data = DMA_TO_DEVICE;
- 		dir_slave = DMA_MEM_TO_DEV;
- 	}
- 
-+	/* The parameters have already been validated, so this will not fail */
-+	(void)dmaengine_slave_config(dma_chan,
-+				     (dir_data == DMA_FROM_DEVICE) ?
-+				     &host->dma_cfg_rx :
-+				     &host->dma_cfg_tx);
-+
- 	BUG_ON(!dma_chan->device);
- 	BUG_ON(!dma_chan->device->dev);
- 	BUG_ON(!host->data->sg);
-@@ -936,7 +942,7 @@ static void bcm2835_mmc_data_irq(struct
- 		if  (host->data->flags & MMC_DATA_WRITE) {
- 			/* IRQ handled here */
- 
--			dma_chan = host->dma_chan_tx;
-+			dma_chan = host->dma_chan_rxtx;
- 			dir_data = DMA_TO_DEVICE;
- 			dma_unmap_sg(dma_chan->device->dev,
- 				 host->data->sg, host->data->sg_len,
-@@ -1316,28 +1322,47 @@ static int bcm2835_mmc_add_host(struct b
- 	dev_info(dev, "Forcing PIO mode\n");
- 	host->have_dma = false;
- #else
--	if (IS_ERR_OR_NULL(host->dma_chan_tx) ||
--	    IS_ERR_OR_NULL(host->dma_chan_rx)) {
--		dev_err(dev, "%s: Unable to initialise DMA channels. Falling back to PIO\n",
-+	if (IS_ERR_OR_NULL(host->dma_chan_rxtx)) {
-+		dev_err(dev, "%s: Unable to initialise DMA channel. Falling back to PIO\n",
- 			DRIVER_NAME);
- 		host->have_dma = false;
- 	} else {
--		dev_info(dev, "DMA channels allocated");
--		host->have_dma = true;
-+		dev_info(dev, "DMA channel allocated");
- 
- 		cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
- 		cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
- 		cfg.slave_id = 11;		/* DREQ channel */
- 
-+		/* Validate the slave configurations */
-+
- 		cfg.direction = DMA_MEM_TO_DEV;
- 		cfg.src_addr = 0;
- 		cfg.dst_addr = host->bus_addr + SDHCI_BUFFER;
--		ret = dmaengine_slave_config(host->dma_chan_tx, &cfg);
- 
--		cfg.direction = DMA_DEV_TO_MEM;
--		cfg.src_addr = host->bus_addr + SDHCI_BUFFER;
--		cfg.dst_addr = 0;
--		ret = dmaengine_slave_config(host->dma_chan_rx, &cfg);
-+		ret = dmaengine_slave_config(host->dma_chan_rxtx, &cfg);
-+
-+		if (ret == 0) {
-+			host->dma_cfg_tx = cfg;
-+
-+			cfg.direction = DMA_DEV_TO_MEM;
-+			cfg.src_addr = host->bus_addr + SDHCI_BUFFER;
-+			cfg.dst_addr = 0;
-+
-+			ret = dmaengine_slave_config(host->dma_chan_rxtx, &cfg);
-+		}
-+
-+		if (ret == 0) {
-+			host->dma_cfg_rx = cfg;
-+
-+			host->use_dma = true;
-+		} else {
-+			pr_err("%s: unable to configure DMA channel. "
-+			       "Faling back to PIO\n",
-+			       mmc_hostname(mmc));
-+			dma_release_channel(host->dma_chan_rxtx);
-+			host->dma_chan_rxtx = NULL;
-+			host->use_dma = false;
-+		}
- 	}
- #endif
- 	mmc->max_segs = 128;
-@@ -1416,16 +1441,20 @@ static int bcm2835_mmc_probe(struct plat
- 
- #ifndef FORCE_PIO
- 	if (node) {
--		host->dma_chan_tx = dma_request_slave_channel(dev, "tx");
--		host->dma_chan_rx = dma_request_slave_channel(dev, "rx");
-+		host->dma_chan_rxtx = dma_request_slave_channel(dev, "rx-tx");
-+		if (!host->dma_chan_rxtx)
-+			host->dma_chan_rxtx =
-+				dma_request_slave_channel(dev, "tx");
-+		if (!host->dma_chan_rxtx)
-+			host->dma_chan_rxtx =
-+				dma_request_slave_channel(dev, "rx");
- 	} else {
- 		dma_cap_mask_t mask;
- 
- 		dma_cap_zero(mask);
- 		/* we don't care about the channel, any would work */
- 		dma_cap_set(DMA_SLAVE, mask);
--		host->dma_chan_tx = dma_request_channel(mask, NULL, NULL);
--		host->dma_chan_rx = dma_request_channel(mask, NULL, NULL);
-+		host->dma_chan_rxtx = dma_request_channel(mask, NULL, NULL);
- 	}
- #endif
- 	clk = devm_clk_get(dev, NULL);