diff options
Diffstat (limited to 'arch/arm/mach-stmp37xx/stmp37xx.c')
| -rw-r--r-- | arch/arm/mach-stmp37xx/stmp37xx.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/arch/arm/mach-stmp37xx/stmp37xx.c b/arch/arm/mach-stmp37xx/stmp37xx.c new file mode 100644 index 000000000000..83a41c90c252 --- /dev/null +++ b/arch/arm/mach-stmp37xx/stmp37xx.c @@ -0,0 +1,217 @@ +/* + * Freescale STMP37XX platform support + * + * Embedded Alley Solutions, Inc <source@embeddedalley.com> + * + * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/irq.h> +#include <linux/io.h> + +#include <asm/setup.h> +#include <asm/mach-types.h> + +#include <asm/mach/arch.h> +#include <asm/mach/irq.h> +#include <asm/mach/map.h> +#include <asm/mach/time.h> + +#include <mach/stmp3xxx.h> +#include <mach/dma.h> + +#include <mach/regs-icoll.h> +#include <mach/regs-apbh.h> +#include <mach/regs-apbx.h> +#include "stmp37xx.h" + +/* + * IRQ handling + */ +static void stmp37xx_ack_irq(unsigned int irq) +{ + /* Disable IRQ */ + HW_ICOLL_PRIORITYn_CLR(irq / 4, 0x04 << ((irq % 4) * 8)); + + /* ACK current interrupt */ + HW_ICOLL_LEVELACK_WR(1); + + /* Barrier */ + (void) HW_ICOLL_STAT_RD(); +} + +static void stmp37xx_mask_irq(unsigned int irq) +{ + /* IRQ disable */ + HW_ICOLL_PRIORITYn_CLR(irq / 4, 0x04 << ((irq % 4) * 8)); +} + +static void stmp37xx_unmask_irq(unsigned int irq) +{ + /* IRQ enable */ + HW_ICOLL_PRIORITYn_SET(irq / 4, 0x04 << ((irq % 4) * 8)); +} + +static struct irq_chip stmp37xx_chip = { + .ack = stmp37xx_ack_irq, + .mask = stmp37xx_mask_irq, + .unmask = stmp37xx_unmask_irq, +}; + +void __init stmp37xx_init_irq(void) +{ + stmp3xxx_init_irq(&stmp37xx_chip); +} + +/* + * DMA interrupt handling + */ +void stmp3xxx_arch_dma_enable_interrupt(int channel) +{ + int dmabus = channel / 16; + + switch (dmabus) { + case STMP3XXX_BUS_APBH: + HW_APBH_CTRL1_SET(1 << (8 + (channel % 16))); + break; + + case STMP3XXX_BUS_APBX: + HW_APBX_CTRL1_SET(1 << (8 + (channel % 16))); + break; + } +} +EXPORT_SYMBOL(stmp3xxx_arch_dma_enable_interrupt); + +void stmp3xxx_arch_dma_clear_interrupt(int channel) +{ + int dmabus = channel / 16; + + switch (dmabus) { + case STMP3XXX_BUS_APBH: + HW_APBH_CTRL1_CLR(1 << (channel % 16)); + break; + + case STMP3XXX_BUS_APBX: + HW_APBX_CTRL1_CLR(1 << (channel % 16)); + break; + } +} +EXPORT_SYMBOL(stmp3xxx_arch_dma_clear_interrupt); + +int stmp3xxx_arch_dma_is_interrupt(int channel) +{ + int r = 0; + + int dmabus = channel / 16; + + switch (dmabus) { + case STMP3XXX_BUS_APBH: + r = HW_APBH_CTRL1_RD() & (1 << (channel % 16)); + break; + + case STMP3XXX_BUS_APBX: + r = HW_APBX_CTRL1_RD() & (1 << (channel % 16)); + break; + } + return r; +} +EXPORT_SYMBOL(stmp3xxx_arch_dma_is_interrupt); + +void stmp3xxx_arch_dma_reset_channel(int channel) +{ + int dmabus = channel / 16; + unsigned chbit = 1 << (channel % 16); + + switch (dmabus) { + case STMP3XXX_BUS_APBH: + /* Reset channel and wait for it to complete */ + HW_APBH_CTRL0_SET(chbit << BP_APBH_CTRL0_RESET_CHANNEL); + while (HW_APBH_CTRL0_RD() & + (chbit << BP_APBH_CTRL0_RESET_CHANNEL)) + continue; + break; + + case STMP3XXX_BUS_APBX: + /* Reset channel and wait for it to complete */ + HW_APBX_CTRL0_SET(chbit << BP_APBX_CTRL0_RESET_CHANNEL); + while (HW_APBX_CTRL0_RD() & + (chbit << BP_APBX_CTRL0_RESET_CHANNEL)) + continue; + break; + } +} +EXPORT_SYMBOL(stmp3xxx_arch_dma_reset_channel); + +void stmp3xxx_arch_dma_freeze(int channel) +{ + int dmabus = channel / 16; + unsigned chbit = 1 << (channel % 16); + + switch (dmabus) { + case STMP3XXX_BUS_APBH: + HW_APBH_CTRL0_SET(1<<chbit); + break; + case STMP3XXX_BUS_APBX: + HW_APBX_CTRL0_SET(1<<chbit); + break; + } +} +EXPORT_SYMBOL(stmp3xxx_arch_dma_freeze); + +void stmp3xxx_arch_dma_unfreeze(int channel) +{ + int dmabus = channel / 16; + unsigned chbit = 1 << (channel % 16); + + switch (dmabus) { + case STMP3XXX_BUS_APBH: + HW_APBH_CTRL0_CLR(1<<chbit); + break; + case STMP3XXX_BUS_APBX: + HW_APBX_CTRL0_CLR(1<<chbit); + break; + } +} +EXPORT_SYMBOL(stmp3xxx_arch_dma_unfreeze); + +/* + * The registers are all very closely mapped, so we might as well map them all + * with a single mapping + * + * Logical Physical + * f0000000 80000000 On-chip registers + * f1000000 00000000 256k on-chip SRAM + */ +static struct map_desc stmp37xx_io_desc[] __initdata = { + { + .virtual = (u32)STMP3XXX_REGS_BASE, + .pfn = __phys_to_pfn(STMP3XXX_REGS_PHBASE), + .length = SZ_1M, + .type = MT_DEVICE + }, + { + .virtual = (u32)STMP3XXX_OCRAM_BASE, + .pfn = __phys_to_pfn(STMP3XXX_OCRAM_PHBASE), + .length = STMP3XXX_OCRAM_SIZE, + .type = MT_DEVICE, + }, +}; + +void __init stmp37xx_map_io(void) +{ + iotable_init(stmp37xx_io_desc, ARRAY_SIZE(stmp37xx_io_desc)); +} |