diff options
Diffstat (limited to 'target/linux/coldfire/files-2.6.31/arch/m68k/coldfire/m547x/dma.c')
| -rw-r--r-- | target/linux/coldfire/files-2.6.31/arch/m68k/coldfire/m547x/dma.c | 518 |
1 files changed, 0 insertions, 518 deletions
diff --git a/target/linux/coldfire/files-2.6.31/arch/m68k/coldfire/m547x/dma.c b/target/linux/coldfire/files-2.6.31/arch/m68k/coldfire/m547x/dma.c deleted file mode 100644 index 3b24c9b0d7..0000000000 --- a/target/linux/coldfire/files-2.6.31/arch/m68k/coldfire/m547x/dma.c +++ /dev/null @@ -1,518 +0,0 @@ -/* - * arch/m68k/coldfire/m547x/dma.c - * - * Coldfire M547x/M548x DMA - * - * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. - * Kurt Mahan <kmahan@freescale.com> - * Shrek Wu b16972@freescale.com - * - * This code is based on patches from the Freescale M547x_8x BSP - * release mcf547x_8x-20070107-ltib.iso - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/dma.h> -#include <asm/coldfire.h> -#include <asm/m5485sram.h> -#include <asm/mcfsim.h> -#include <asm/MCD_dma.h> - -/* - * This global keeps track of which initiators have been - * used of the available assignments. Initiators 0-15 are - * hardwired. Initiators 16-31 are multiplexed and controlled - * via the Initiatior Mux Control Registe (IMCR). The - * assigned requestor is stored with the associated initiator - * number. - */ -static int used_reqs[32] = { - DMA_ALWAYS, DMA_DSPI_RX, DMA_DSPI_TX, DMA_DREQ0, - DMA_PSC0_RX, DMA_PSC0_TX, DMA_USBEP0, DMA_USBEP1, - DMA_USBEP2, DMA_USBEP3, DMA_PCI_TX, DMA_PCI_RX, - DMA_PSC1_RX, DMA_PSC1_TX, DMA_I2C_RX, DMA_I2C_TX, - 0, 0, 0, 0, - 0, 0, 0, 0, - 0, 0, 0, 0, - 0, 0, 0, 0 -}; - -/* - * This global keeps track of which channels have been assigned - * to tasks. This methology assumes that no single initiator - * will be tied to more than one task/channel - */ -static char used_channel[16] = { - -1, -1, -1, -1, -1, -1, -1, -1, - -1, -1, -1, -1, -1, -1, -1, -1 -}; - -unsigned int connected_channel[16] = { - 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0 -}; - -/** - * dma_set_initiator - enable initiator - * @initiator: initiator identifier - * - * Returns 0 of successful, non-zero otherwise - * - * Attempt to enable the provided Initiator in the Initiator - * Mux Control Register. - */ -int dma_set_initiator(int initiator) -{ - switch (initiator) { - case DMA_ALWAYS: - case DMA_DSPI_RX: - case DMA_DSPI_TX: - case DMA_DREQ0: - case DMA_PSC0_RX: - case DMA_PSC0_TX: - case DMA_USBEP0: - case DMA_USBEP1: - case DMA_USBEP2: - case DMA_USBEP3: - case DMA_PCI_TX: - case DMA_PCI_RX: - case DMA_PSC1_RX: - case DMA_PSC1_TX: - case DMA_I2C_RX: - case DMA_I2C_TX: - /* - * These initiators are always active - */ - break; - - case DMA_FEC0_RX: - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC16(3)) - | MCF_DMA_IMCR_SRC16_FEC0RX; - used_reqs[16] = DMA_FEC0_RX; - break; - - case DMA_FEC0_TX: - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC17(3)) - | MCF_DMA_IMCR_SRC17_FEC0TX; - used_reqs[17] = DMA_FEC0_TX; - break; - - case DMA_FEC1_RX: - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC20(3)) - | MCF_DMA_IMCR_SRC20_FEC1RX; - used_reqs[20] = DMA_FEC1_RX; - break; - - case DMA_FEC1_TX: - if (used_reqs[21] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC21(3)) - | MCF_DMA_IMCR_SRC21_FEC1TX; - used_reqs[21] = DMA_FEC1_TX; - } else if (used_reqs[25] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC25(3)) - | MCF_DMA_IMCR_SRC25_FEC1TX; - used_reqs[25] = DMA_FEC1_TX; - } else if (used_reqs[31] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC31(3)) - | MCF_DMA_IMCR_SRC31_FEC1TX; - used_reqs[31] = DMA_FEC1_TX; - } else /* No empty slots */ - return 1; - break; - - case DMA_DREQ1: - if (used_reqs[29] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC29(3)) - | MCF_DMA_IMCR_SRC29_DREQ1; - used_reqs[29] = DMA_DREQ1; - } else if (used_reqs[21] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC21(3)) - | MCF_DMA_IMCR_SRC21_DREQ1; - used_reqs[21] = DMA_DREQ1; - } else /* No empty slots */ - return 1; - break; - - case DMA_CTM0: - if (used_reqs[24] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC24(3)) - | MCF_DMA_IMCR_SRC24_CTM0; - used_reqs[24] = DMA_CTM0; - } else /* No empty slots */ - return 1; - break; - - case DMA_CTM1: - if (used_reqs[25] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC25(3)) - | MCF_DMA_IMCR_SRC25_CTM1; - used_reqs[25] = DMA_CTM1; - } else /* No empty slots */ - return 1; - break; - - case DMA_CTM2: - if (used_reqs[26] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC26(3)) - | MCF_DMA_IMCR_SRC26_CTM2; - used_reqs[26] = DMA_CTM2; - } else /* No empty slots */ - return 1; - break; - - case DMA_CTM3: - if (used_reqs[27] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC27(3)) - | MCF_DMA_IMCR_SRC27_CTM3; - used_reqs[27] = DMA_CTM3; - } else /* No empty slots */ - return 1; - break; - - case DMA_CTM4: - if (used_reqs[28] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC28(3)) - | MCF_DMA_IMCR_SRC28_CTM4; - used_reqs[28] = DMA_CTM4; - } else /* No empty slots */ - return 1; - break; - - case DMA_CTM5: - if (used_reqs[29] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC29(3)) - | MCF_DMA_IMCR_SRC29_CTM5; - used_reqs[29] = DMA_CTM5; - } else /* No empty slots */ - return 1; - break; - - case DMA_CTM6: - if (used_reqs[30] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC30(3)) - | MCF_DMA_IMCR_SRC30_CTM6; - used_reqs[30] = DMA_CTM6; - } else /* No empty slots */ - return 1; - break; - - case DMA_CTM7: - if (used_reqs[31] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC31(3)) - | MCF_DMA_IMCR_SRC31_CTM7; - used_reqs[31] = DMA_CTM7; - } else /* No empty slots */ - return 1; - break; - - case DMA_USBEP4: - if (used_reqs[26] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC26(3)) - | MCF_DMA_IMCR_SRC26_USBEP4; - used_reqs[26] = DMA_USBEP4; - } else /* No empty slots */ - return 1; - break; - - case DMA_USBEP5: - if (used_reqs[27] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC27(3)) - | MCF_DMA_IMCR_SRC27_USBEP5; - used_reqs[27] = DMA_USBEP5; - } else /* No empty slots */ - return 1; - break; - - case DMA_USBEP6: - if (used_reqs[28] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC28(3)) - | MCF_DMA_IMCR_SRC28_USBEP6; - used_reqs[28] = DMA_USBEP6; - } else /* No empty slots */ - return 1; - break; - - case DMA_PSC2_RX: - if (used_reqs[28] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC28(3)) - | MCF_DMA_IMCR_SRC28_PSC2RX; - used_reqs[28] = DMA_PSC2_RX; - } else /* No empty slots */ - return 1; - break; - - case DMA_PSC2_TX: - if (used_reqs[29] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC29(3)) - | MCF_DMA_IMCR_SRC29_PSC2TX; - used_reqs[29] = DMA_PSC2_TX; - } else /* No empty slots */ - return 1; - break; - - case DMA_PSC3_RX: - if (used_reqs[30] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC30(3)) - | MCF_DMA_IMCR_SRC30_PSC3RX; - used_reqs[30] = DMA_PSC3_RX; - } else /* No empty slots */ - return 1; - break; - - case DMA_PSC3_TX: - if (used_reqs[31] == 0) { - MCF_DMA_IMCR = (MCF_DMA_IMCR & ~MCF_DMA_IMCR_SRC31(3)) - | MCF_DMA_IMCR_SRC31_PSC3TX; - used_reqs[31] = DMA_PSC3_TX; - } else /* No empty slots */ - return 1; - break; - - default: - return 1; - } - return 0; -} - -/** - * dma_get_initiator - get the initiator for the given requestor - * @requestor: initiator identifier - * - * Returns initiator number (0-31) if assigned or just 0 - */ -unsigned int dma_get_initiator(int requestor) -{ - u32 i; - - for (i = 0; i < sizeof(used_reqs); ++i) { - if (used_reqs[i] == requestor) - return i; - } - return 0; -} - -/** - * dma_remove_initiator - remove the given initiator from active list - * @requestor: requestor to remove - */ -void dma_remove_initiator(int requestor) -{ - u32 i; - - for (i = 0; i < sizeof(used_reqs); ++i) { - if (used_reqs[i] == requestor) { - used_reqs[i] = -1; - break; - } - } -} - -/** - * dma_set_channel_fec: find available channel for fec and mark - * @requestor: initiator/requestor identifier - * - * Returns first avaialble channel (0-5) or -1 if all occupied - */ -int dma_set_channel_fec(int requestor) -{ - u32 i, t; - -#ifdef CONFIG_FEC_548x_ENABLE_FEC2 - t = 4; -#else - t = 2; -#endif - - for (i = 0; i < t ; ++i) { - if (used_channel[i] == -1) { - used_channel[i] = requestor; - return i; - } - } - /* All channels taken */ - return -1; -} - -/** - * dma_set_channel - find an available channel and mark as used - * @requestor: initiator/requestor identifier - * - * Returns first available channel (6-15) or -1 if all occupied - */ -int dma_set_channel(int requestor) -{ - u32 i; -#ifdef CONFIG_NET_FEC2 - i = 4; -#else - i = 2; -#endif - - for (; i < 16; ++i) - if (used_channel[i] == -1) { - used_channel[i] = requestor; - return i; - } - - /* All channels taken */ - return -1; -} - -/** - * dma_get_channel - get the channel being initiated by the requestor - * @requestor: initiator/requestor identifier - * - * Returns Initiator for requestor or -1 if not found - */ -int dma_get_channel(int requestor) -{ - u32 i; - - for (i = 0; i < sizeof(used_channel); ++i) { - if (used_channel[i] == requestor) - return i; - } - return -1; -} - -/** - * dma_connect - connect a channel with reference on data - * @channel: channel number - * @address: reference address of data - * - * Returns 0 if success or -1 if invalid channel - */ -int dma_connect(int channel, int address) -{ - if ((channel < 16) && (channel >= 0)) { - connected_channel[channel] = address; - return 0; - } - return -1; -} - -/** - * dma_disconnect - disconnect a channel - * @channel: channel number - * - * Returns 0 if success or -1 if invalid channel - */ -int dma_disconnect(int channel) -{ - if ((channel < 16) && (channel >= 0)) { - connected_channel[channel] = 0; - return 0; - } - return -1; -} - -/** - * dma_remove_channel - remove channel from the active list - * @requestor: initiator/requestor identifier - */ -void dma_remove_channel(int requestor) -{ - u32 i; - - for (i = 0; i < sizeof(used_channel); ++i) { - if (used_channel[i] == requestor) { - used_channel[i] = -1; - break; - } - } -} - -/** - * dma_interrupt_handler - dma interrupt handler - * @irq: interrupt number - * @dev_id: data - * - * Returns IRQ_HANDLED - */ -irqreturn_t dma_interrupt_handler(int irq, void *dev_id) -{ - u32 i, interrupts; - - /* - * Determine which interrupt(s) triggered by AND'ing the - * pending interrupts with those that aren't masked. - */ - interrupts = MCF_DMA_DIPR; - MCF_DMA_DIPR = interrupts; - - for (i = 0; i < 16; ++i, interrupts >>= 1) { - if (interrupts & 0x1) - if (connected_channel[i] != 0) - ((void (*)(void)) (connected_channel[i])) (); - } - - return IRQ_HANDLED; -} - -/** - * dma_remove_channel_by_number - clear dma channel - * @channel: channel number to clear - */ -void dma_remove_channel_by_number(int channel) -{ - if ((channel < sizeof(used_channel)) && (channel >= 0)) - used_channel[channel] = -1; -} - -/** - * dma_init - initialize the dma subsystem - * - * Returns 0 if success non-zero if failure - * - * Handles the DMA initialization during device setup. - */ -int __devinit dma_init() -{ - int result; - char *dma_version_str; - - MCD_getVersion(&dma_version_str); - printk(KERN_INFO "m547x_8x DMA: Initialize %s\n", dma_version_str); - - /* attempt to setup dma interrupt handler */ - if (request_irq(64 + ISC_DMA, dma_interrupt_handler, IRQF_DISABLED, - "MCD-DMA", NULL)) { - printk(KERN_ERR "MCD-DMA: Cannot allocate the DMA IRQ(48)\n"); - return 1; - } - - MCF_DMA_DIMR = 0; - MCF_DMA_DIPR = 0xFFFFFFFF; - - MCF_ICR(ISC_DMA) = ILP_DMA; - - result = MCD_initDma((dmaRegs *) (MCF_MBAR + 0x8000), - (void *) SYS_SRAM_DMA_START, MCD_RELOC_TASKS); - if (result != MCD_OK) { - printk(KERN_ERR "MCD-DMA: Cannot perform DMA initialization\n"); - free_irq(64 + ISC_DMA, NULL); - return 1; - } - - return 0; -} -device_initcall(dma_init); |