cregit-Linux how code gets into the kernel

Release 4.14 arch/cris/arch-v32/mach-a3/dma.c

// SPDX-License-Identifier: GPL-2.0
/* Wrapper for DMA channel allocator that starts clocks etc */

#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <mach/dma.h>
#include <hwregs/reg_map.h>
#include <hwregs/reg_rdwr.h>
#include <hwregs/marb_defs.h>
#include <hwregs/clkgen_defs.h>
#include <hwregs/strmux_defs.h>
#include <linux/errno.h>
#include <arbiter.h>


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_clkgen_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!"); return -EBUSY; } clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl); strmux_cfg = REG_RD(strmux, regi_strmux, rw_cfg); switch (dmanr) { case 0: case 1: clk_ctrl.dma0_1_eth = 1; break; case 2: case 3: clk_ctrl.dma2_3_strcop = 1; break; case 4: case 5: clk_ctrl.dma4_5_iop = 1; break; case 6: case 7: clk_ctrl.sser_ser_dma6_7 = 1; break; case 9: case 11: clk_ctrl.dma9_11 = 1; break; #if MAX_DMA_CHANNELS-1 != 11 #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_eth: if (dmanr == 0) strmux_cfg.dma0 = regk_strmux_eth; else if (dmanr == 1) strmux_cfg.dma1 = regk_strmux_eth; else panic("Invalid DMA channel for eth\n"); break; case dma_ser0: if (dmanr == 0) strmux_cfg.dma0 = regk_strmux_ser0; else if (dmanr == 1) strmux_cfg.dma1 = regk_strmux_ser0; else panic("Invalid DMA channel for ser0\n"); break; case dma_ser3: if (dmanr == 2) strmux_cfg.dma2 = regk_strmux_ser3; else if (dmanr == 3) strmux_cfg.dma3 = regk_strmux_ser3; else panic("Invalid DMA channel for ser3\n"); break; case dma_strp: if (dmanr == 2) strmux_cfg.dma2 = regk_strmux_strcop; else if (dmanr == 3) strmux_cfg.dma3 = regk_strmux_strcop; else panic("Invalid DMA channel for strp\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_iop: if (dmanr == 4) strmux_cfg.dma4 = regk_strmux_iop; else if (dmanr == 5) strmux_cfg.dma5 = regk_strmux_iop; else panic("Invalid DMA channel for iop\n"); break; case dma_ser2: if (dmanr == 6) strmux_cfg.dma6 = regk_strmux_ser2; else if (dmanr == 7) strmux_cfg.dma7 = regk_strmux_ser2; else panic("Invalid DMA channel for ser2\n"); break; case dma_sser: if (dmanr == 6) strmux_cfg.dma6 = regk_strmux_sser; else if (dmanr == 7) strmux_cfg.dma7 = regk_strmux_sser; else panic("Invalid DMA channel for sser\n"); break; case dma_ser4: if (dmanr == 9) strmux_cfg.dma9 = regk_strmux_ser4; else panic("Invalid DMA channel for ser4\n"); break; case dma_jpeg: if (dmanr == 9) strmux_cfg.dma9 = regk_strmux_jpeg; else panic("Invalid DMA channel for JPEG\n"); break; case dma_h264: if (dmanr == 11) strmux_cfg.dma11 = regk_strmux_h264; else panic("Invalid DMA channel for H264\n"); break; } used_dma_channels[dmanr] = 1; used_dma_channels_users[dmanr] = device_id; REG_WR(clkgen, regi_clkgen, rw_clk_ctrl, clk_ctrl); REG_WR(strmux, regi_strmux, rw_cfg, strmux_cfg); spin_unlock_irqrestore(&dma_lock, flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Mikael Starvik59489.06%133.33%
Jesper Nilsson7310.94%266.67%
Total667100.00%3100.00%


void crisv32_free_dma(unsigned int dmanr) { spin_lock(&dma_lock); used_dma_channels[dmanr] = 0; spin_unlock(&dma_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Mikael Starvik28100.00%1100.00%
Total28100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Mikael Starvik66889.19%120.00%
Jesper Nilsson8010.68%360.00%
Greg Kroah-Hartman10.13%120.00%
Total749100.00%5100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.