diff options
Diffstat (limited to 'drivers/staging/nmf-cm/cm_dma.c')
| -rw-r--r-- | drivers/staging/nmf-cm/cm_dma.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/drivers/staging/nmf-cm/cm_dma.c b/drivers/staging/nmf-cm/cm_dma.c new file mode 100644 index 00000000000..652b504324c --- /dev/null +++ b/drivers/staging/nmf-cm/cm_dma.c @@ -0,0 +1,226 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * License terms: GNU General Public License (GPL), version 2. + */ + +#include <linux/kernel.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <asm/io.h> +#include <mach/db8500-regs.h> + +#include "cm_dma.h" + +#define CMDMA_LIDX (2) +#define CMDMA_REG_LCLA (0x024) + +static void __iomem *virtbase = NULL; + +static int cmdma_write_cyclic_list_mem2per( + unsigned int from_addr, + unsigned int to_addr, + unsigned int segments, + unsigned int segmentsize, + unsigned int LOS); + +static int cmdma_write_cyclic_list_per2mem( + unsigned int from_addr, + unsigned int to_addr, + unsigned int segments, + unsigned int segmentsize, + unsigned int LOS); + +static bool cmdma_setup_relink_area_called = false; + +int cmdma_setup_relink_area( unsigned int mem_addr, + unsigned int per_addr, + unsigned int segments, + unsigned int segmentsize, + unsigned int LOS, + enum cmdma_type type) +{ + if (!cmdma_setup_relink_area_called) + cmdma_setup_relink_area_called = true; + + switch (type) { + + case CMDMA_MEM_2_PER: + return cmdma_write_cyclic_list_mem2per( + mem_addr, + per_addr, + segments, + segmentsize, + LOS); + + case CMDMA_PER_2_MEM: + return cmdma_write_cyclic_list_per2mem( + per_addr, + mem_addr, + segments, + segmentsize, + LOS); + + default : + return -EINVAL; + } + } + + static unsigned int cmdma_getlcla( void) { + + if(!virtbase) + virtbase = ioremap(U8500_DMA_BASE, CMDMA_REG_LCLA + sizeof(int) ); + + return readl(virtbase + CMDMA_REG_LCLA); + } + + static void cmdma_write_relink_params_mem2per ( + int * relink, + unsigned int LOS, + unsigned int nb_element, + unsigned int src_addr, + unsigned int dst_addr, + unsigned int burst_size) { + + relink[0] = (((long)(nb_element & 0xFFFF)) << 16) | + (src_addr & 0xFFFF); + + relink[1] = (((src_addr >> 16) & 0xFFFFUL) << 16) | + (0x1200UL | (LOS << 1) | (burst_size<<10)); + + relink[2] = ((nb_element & 0xFFFF) << 16) | + (dst_addr & 0xFFFF); + + relink[3] = (((dst_addr >> 16) & 0xFFFFUL) << 16 ) | + 0x8201UL | ((LOS+1) << 1) | (burst_size<<10); +} + +static void cmdma_write_relink_params_per2mem ( + int * relink, + unsigned int LOS, + unsigned int nb_element, + unsigned int src_addr, + unsigned int dst_addr, + unsigned int burst_size) { + + relink[0] = (((long)(nb_element & 0xFFFF)) << 16) | + (src_addr & 0xFFFF); + + relink[1] = (((src_addr >> 16) & 0xFFFFUL) << 16) | + (0x8201UL | (LOS << 1) | (burst_size<<10)); + + relink[2] = ((nb_element & 0xFFFF) << 16) | + (dst_addr & 0xFFFF); + + relink[3] = (((dst_addr >> 16) & 0xFFFFUL) << 16 ) | + 0x1200UL | ((LOS+1) << 1) | (burst_size<<10); +} + +static int cmdma_write_cyclic_list_mem2per( + unsigned int from_addr, + unsigned int to_addr, + unsigned int segments, + unsigned int segmentsize, + unsigned int LOS) { + + unsigned int i,j; + int *relink; + + j = LOS; + + for ( i = 0; i < segments; i++) { + relink = ioremap_nocache (cmdma_getlcla() + 1024 * CMDMA_LIDX + 8 * j, 4 * sizeof(int)); + + if (i == (segments-1)) + j = LOS; + else + j += 2; + + cmdma_write_relink_params_mem2per ( + relink, + j, + segmentsize / 4, + from_addr, + to_addr, + 0x2); + + iounmap(relink); + + from_addr += segmentsize; + } + + return 0; +} + +static int cmdma_write_cyclic_list_per2mem( + unsigned int from_addr, + unsigned int to_addr, + unsigned int segments, + unsigned int segmentsize, + unsigned int LOS) { + + unsigned int i,j; + int *relink; + j = LOS; + + for ( i = 0; i < segments; i++) { + relink = ioremap_nocache (cmdma_getlcla() + 1024 * CMDMA_LIDX + 8 * j, 4 * sizeof(int)); + + if (i == (segments-1)) + j = LOS; + else + j += 2; + + cmdma_write_relink_params_per2mem ( + relink, + j, + segmentsize / 4, + from_addr, + to_addr, + 0x2); + + iounmap(relink); + + to_addr += segmentsize; + } + + return 0; +} + +static void __iomem *dmabase = 0; +int cmdma_init(void) +{ + dmabase = ioremap_nocache(U8500_DMA_BASE, PAGE_SIZE); + if (dmabase == NULL) + return -ENOMEM; + else + return 0; +} + +void cmdma_destroy(void) +{ + iounmap(dmabase); +} + +#define SSLNK_CHAN_2 (0x40C + 0x20 * 2) +#define SDLNK_CHAN_2 (0x41C + 0x20 * 2) + +void cmdma_stop_dma(void) +{ + if(cmdma_setup_relink_area_called) { + cmdma_setup_relink_area_called = false; + if (readl(dmabase + SSLNK_CHAN_2) & (0x3 << 28)) { + printk(KERN_ERR "CM: ERROR - RX DMA was running\n"); + } + if (readl(dmabase + SDLNK_CHAN_2) & (0x3 << 28)) { + printk(KERN_ERR "CM: ERROR - TX DMA was running\n"); + } + + writel(~(1 << 28), dmabase + SSLNK_CHAN_2); + while (readl(dmabase + SSLNK_CHAN_2) & (0x3 << 28)); + + writel(~(1 << 28), dmabase + SDLNK_CHAN_2); + while (readl(dmabase + SDLNK_CHAN_2) & (0x3 << 28)); + } +} |