From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/cris/arch-v32/mach-fs/dma.c | 229 ++++++++++++++++++++++++++++++++ 1 file changed, 229 insertions(+) create mode 100644 kernel/arch/cris/arch-v32/mach-fs/dma.c (limited to 'kernel/arch/cris/arch-v32/mach-fs/dma.c') diff --git a/kernel/arch/cris/arch-v32/mach-fs/dma.c b/kernel/arch/cris/arch-v32/mach-fs/dma.c new file mode 100644 index 000000000..fc6416a67 --- /dev/null +++ b/kernel/arch/cris/arch-v32/mach-fs/dma.c @@ -0,0 +1,229 @@ +/* Wrapper for DMA channel allocator that starts clocks etc */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static char used_dma_channels[MAX_DMA_CHANNELS]; +static const char *used_dma_channels_users[MAX_DMA_CHANNELS]; + +static DEFINE_SPINLOCK(dma_lock); + +int crisv32_request_dma(unsigned int dmanr, const char *device_id, + unsigned options, unsigned int bandwidth, + enum dma_owner owner) +{ + unsigned long flags; + reg_config_rw_clk_ctrl clk_ctrl; + reg_strmux_rw_cfg strmux_cfg; + + if (crisv32_arbiter_allocate_bandwidth(dmanr, + options & DMA_INT_MEM ? + INT_REGION : EXT_REGION, + bandwidth)) + return -ENOMEM; + + spin_lock_irqsave(&dma_lock, flags); + + if (used_dma_channels[dmanr]) { + spin_unlock_irqrestore(&dma_lock, flags); + if (options & DMA_VERBOSE_ON_ERROR) { + printk(KERN_ERR "Failed to request DMA %i for %s, " + "already allocated by %s\n", + dmanr, + device_id, + used_dma_channels_users[dmanr]); + } + if (options & DMA_PANIC_ON_ERROR) + panic("request_dma error!"); + spin_unlock_irqrestore(&dma_lock, flags); + return -EBUSY; + } + clk_ctrl = REG_RD(config, regi_config, rw_clk_ctrl); + strmux_cfg = REG_RD(strmux, regi_strmux, rw_cfg); + + switch (dmanr) { + case 0: + case 1: + clk_ctrl.dma01_eth0 = 1; + break; + case 2: + case 3: + clk_ctrl.dma23 = 1; + break; + case 4: + case 5: + clk_ctrl.dma45 = 1; + break; + case 6: + case 7: + clk_ctrl.dma67 = 1; + break; + case 8: + case 9: + clk_ctrl.dma89_strcop = 1; + break; +#if MAX_DMA_CHANNELS-1 != 9 +#error Check dma.c +#endif + default: + spin_unlock_irqrestore(&dma_lock, flags); + if (options & DMA_VERBOSE_ON_ERROR) { + printk(KERN_ERR "Failed to request DMA %i for %s, " + "only 0-%i valid)\n", + dmanr, device_id, MAX_DMA_CHANNELS - 1); + } + + if (options & DMA_PANIC_ON_ERROR) + panic("request_dma error!"); + return -EINVAL; + } + + switch (owner) { + case dma_eth0: + if (dmanr == 0) + strmux_cfg.dma0 = regk_strmux_eth0; + else if (dmanr == 1) + strmux_cfg.dma1 = regk_strmux_eth0; + else + panic("Invalid DMA channel for eth0\n"); + break; + case dma_eth1: + if (dmanr == 6) + strmux_cfg.dma6 = regk_strmux_eth1; + else if (dmanr == 7) + strmux_cfg.dma7 = regk_strmux_eth1; + else + panic("Invalid DMA channel for eth1\n"); + break; + case dma_iop0: + if (dmanr == 2) + strmux_cfg.dma2 = regk_strmux_iop0; + else if (dmanr == 3) + strmux_cfg.dma3 = regk_strmux_iop0; + else + panic("Invalid DMA channel for iop0\n"); + break; + case dma_iop1: + if (dmanr == 4) + strmux_cfg.dma4 = regk_strmux_iop1; + else if (dmanr == 5) + strmux_cfg.dma5 = regk_strmux_iop1; + else + panic("Invalid DMA channel for iop1\n"); + break; + case dma_ser0: + if (dmanr == 6) + strmux_cfg.dma6 = regk_strmux_ser0; + else if (dmanr == 7) + strmux_cfg.dma7 = regk_strmux_ser0; + else + panic("Invalid DMA channel for ser0\n"); + break; + case dma_ser1: + if (dmanr == 4) + strmux_cfg.dma4 = regk_strmux_ser1; + else if (dmanr == 5) + strmux_cfg.dma5 = regk_strmux_ser1; + else + panic("Invalid DMA channel for ser1\n"); + break; + case dma_ser2: + if (dmanr == 2) + strmux_cfg.dma2 = regk_strmux_ser2; + else if (dmanr == 3) + strmux_cfg.dma3 = regk_strmux_ser2; + else + panic("Invalid DMA channel for ser2\n"); + break; + case dma_ser3: + if (dmanr == 8) + strmux_cfg.dma8 = regk_strmux_ser3; + else if (dmanr == 9) + strmux_cfg.dma9 = regk_strmux_ser3; + else + panic("Invalid DMA channel for ser3\n"); + break; + case dma_sser0: + if (dmanr == 4) + strmux_cfg.dma4 = regk_strmux_sser0; + else if (dmanr == 5) + strmux_cfg.dma5 = regk_strmux_sser0; + else + panic("Invalid DMA channel for sser0\n"); + break; + case dma_sser1: + if (dmanr == 6) + strmux_cfg.dma6 = regk_strmux_sser1; + else if (dmanr == 7) + strmux_cfg.dma7 = regk_strmux_sser1; + else + panic("Invalid DMA channel for sser1\n"); + break; + case dma_ata: + if (dmanr == 2) + strmux_cfg.dma2 = regk_strmux_ata; + else if (dmanr == 3) + strmux_cfg.dma3 = regk_strmux_ata; + else + panic("Invalid DMA channel for ata\n"); + break; + case dma_strp: + if (dmanr == 8) + strmux_cfg.dma8 = regk_strmux_strcop; + else if (dmanr == 9) + strmux_cfg.dma9 = regk_strmux_strcop; + else + panic("Invalid DMA channel for strp\n"); + break; + case dma_ext0: + if (dmanr == 6) + strmux_cfg.dma6 = regk_strmux_ext0; + else + panic("Invalid DMA channel for ext0\n"); + break; + case dma_ext1: + if (dmanr == 7) + strmux_cfg.dma7 = regk_strmux_ext1; + else + panic("Invalid DMA channel for ext1\n"); + break; + case dma_ext2: + if (dmanr == 2) + strmux_cfg.dma2 = regk_strmux_ext2; + else if (dmanr == 8) + strmux_cfg.dma8 = regk_strmux_ext2; + else + panic("Invalid DMA channel for ext2\n"); + break; + case dma_ext3: + if (dmanr == 3) + strmux_cfg.dma3 = regk_strmux_ext3; + else if (dmanr == 9) + strmux_cfg.dma9 = regk_strmux_ext2; + else + panic("Invalid DMA channel for ext2\n"); + break; + } + + used_dma_channels[dmanr] = 1; + used_dma_channels_users[dmanr] = device_id; + REG_WR(config, regi_config, rw_clk_ctrl, clk_ctrl); + REG_WR(strmux, regi_strmux, rw_cfg, strmux_cfg); + spin_unlock_irqrestore(&dma_lock, flags); + return 0; +} + +void crisv32_free_dma(unsigned int dmanr) +{ + spin_lock(&dma_lock); + used_dma_channels[dmanr] = 0; + spin_unlock(&dma_lock); +} -- cgit 1.2.3-korg