diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-27 18:17:02 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-27 18:17:02 -0700 |
commit | 9e4db1c3eed55c22328d8022c2c80adb3093833f (patch) | |
tree | 9643545e6bd182f1d3e19942f590a6a1e3198320 /arch/arm/mach-sa1100 | |
parent | de8856d2c11f562c60ed9340a83db4a4f829a6e6 (diff) | |
parent | aae528d9a8ad79d4b21b1b723abc9447fdb0d200 (diff) |
Merge branch 'platforms' of git://git.linaro.org/people/rmk/linux-arm
Pull ARM platform updates from Russell King:
"This covers platform stuff for platforms I have a direct interest in
(iow, I have the hardware). Essentially:
- as we no longer support any other Acorn platforms other than RiscPC
anymore, we can collect all that code into mach-rpc.
- convert Acorn expansion card stuff to use IRQ allocation functions,
and get rid of NO_IRQ from there.
- cleanups to the ebsa110 platform to move some private stuff out of
its header files.
- large amount of SA11x0 updates:
- conversion of private DMA implementation to DMA engine support
(this actually gives us greater flexibility in drivers over the old
API.)
- re-worked ucb1x00 updates - convert to genirq, remove sa11x0
dependencies, fix various minor issues
- move platform specific sa11x0 framebuffer data into platform files
in arch/arm instead of keeping this in the driver itself
- update sa11x0 IrDA driver for DMA engine, and allow it to use DMA
for SIR transmissions as well as FIR
- rework sa1111 support for genirq, and irq allocation
- fix sa1111 IRQ support so it works again
- use sparse IRQ support
After this, I have one more pull request remaining from my current
set, which I think is going to be the most problematical as it
generates 8 conflicts."
Fixed up the trivial conflict in arch/arm/mach-rpc/Makefile as per
Russell.
* 'platforms' of git://git.linaro.org/people/rmk/linux-arm: (125 commits)
ARM: 7343/1: sa11x0: convert to sparse IRQ
ARM: 7342/2: sa1100: prepare for sparse irq conversion
ARM: 7341/1: input: prepare jornada720 keyboard and ts for sa11x0 sparse irq
ARM: 7340/1: rtc: sa1100: include mach/irqs.h instead of asm/irq.h
ARM: sa11x0: remove unused DMA controller definitions
ARM: sa11x0: remove old SoC private DMA driver
USB: sa1111: add hcd .reset method
USB: sa1111: add OHCI shutdown methods
USB: sa1111: reorganize ohci-sa1111.c
USB: sa1111: get rid of nasty printk(KERN_DEBUG "%s: ...", __FILE__)
USB: sa1111: sparse and checkpatch cleanups
ARM: sa11x0: don't static map sa1111
ARM: sa1111: use dev_err() rather than printk()
ARM: sa1111: cleanup sub-device registration and unregistration
ARM: sa1111: only setup DMA for DMA capable devices
ARM: sa1111: register sa1111 devices with dmabounce in bus notifier
ARM: sa1111: move USB interface register definitions to ohci-sa1111.c
ARM: sa1111: move PCMCIA interface register definitions to sa1111_generic.c
ARM: sa1111: move PS/2 interface register definitions to sa1111p2.c
ARM: sa1111: delete unused physical GPIO register definitions
...
Diffstat (limited to 'arch/arm/mach-sa1100')
30 files changed, 838 insertions, 1314 deletions
diff --git a/arch/arm/mach-sa1100/Makefile b/arch/arm/mach-sa1100/Makefile index ed7408d3216c..60b97ec01676 100644 --- a/arch/arm/mach-sa1100/Makefile +++ b/arch/arm/mach-sa1100/Makefile @@ -3,7 +3,7 @@ # # Common support -obj-y := clock.o generic.o irq.o dma.o time.o #nmi-oopser.o +obj-y := clock.o generic.o irq.o time.o #nmi-oopser.o obj-m := obj-n := obj- := diff --git a/arch/arm/mach-sa1100/assabet.c b/arch/arm/mach-sa1100/assabet.c index 0c4b76ab4d8e..375d3f779a88 100644 --- a/arch/arm/mach-sa1100/assabet.c +++ b/arch/arm/mach-sa1100/assabet.c @@ -15,14 +15,16 @@ #include <linux/errno.h> #include <linux/ioport.h> #include <linux/serial_core.h> +#include <linux/mfd/ucb1x00.h> #include <linux/mtd/mtd.h> #include <linux/mtd/partitions.h> #include <linux/delay.h> #include <linux/mm.h> +#include <video/sa1100fb.h> + #include <mach/hardware.h> #include <asm/mach-types.h> -#include <asm/irq.h> #include <asm/setup.h> #include <asm/page.h> #include <asm/pgtable-hwdef.h> @@ -36,17 +38,18 @@ #include <asm/mach/serial_sa1100.h> #include <mach/assabet.h> #include <mach/mcp.h> +#include <mach/irqs.h> #include "generic.h" #define ASSABET_BCR_DB1110 \ - (ASSABET_BCR_SPK_OFF | ASSABET_BCR_QMUTE | \ + (ASSABET_BCR_SPK_OFF | \ ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED | \ ASSABET_BCR_RS232EN | ASSABET_BCR_LCD_12RGB | \ ASSABET_BCR_IRDA_MD0) #define ASSABET_BCR_DB1111 \ - (ASSABET_BCR_SPK_OFF | ASSABET_BCR_QMUTE | \ + (ASSABET_BCR_SPK_OFF | \ ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED | \ ASSABET_BCR_RS232EN | ASSABET_BCR_LCD_12RGB | \ ASSABET_BCR_CF_BUS_OFF | ASSABET_BCR_STEREO_LB | \ @@ -69,31 +72,10 @@ void ASSABET_BCR_frob(unsigned int mask, unsigned int val) EXPORT_SYMBOL(ASSABET_BCR_frob); -static void assabet_backlight_power(int on) -{ -#ifndef ASSABET_PAL_VIDEO - if (on) - ASSABET_BCR_set(ASSABET_BCR_LIGHT_ON); - else -#endif - ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON); -} - -/* - * Turn on/off the backlight. When turning the backlight on, - * we wait 500us after turning it on so we don't cause the - * supplies to droop when we enable the LCD controller (and - * cause a hard reset.) - */ -static void assabet_lcd_power(int on) +static void assabet_ucb1x00_reset(enum ucb1x00_reset state) { -#ifndef ASSABET_PAL_VIDEO - if (on) { - ASSABET_BCR_set(ASSABET_BCR_LCD_ON); - udelay(500); - } else -#endif - ASSABET_BCR_clear(ASSABET_BCR_LCD_ON); + if (state == UCB_RST_PROBE) + ASSABET_BCR_set(ASSABET_BCR_CODEC_RST); } @@ -152,15 +134,8 @@ static struct flash_platform_data assabet_flash_data = { }; static struct resource assabet_flash_resources[] = { - { - .start = SA1100_CS0_PHYS, - .end = SA1100_CS0_PHYS + SZ_32M - 1, - .flags = IORESOURCE_MEM, - }, { - .start = SA1100_CS1_PHYS, - .end = SA1100_CS1_PHYS + SZ_32M - 1, - .flags = IORESOURCE_MEM, - } + DEFINE_RES_MEM(SA1100_CS0_PHYS, SZ_32M), + DEFINE_RES_MEM(SA1100_CS1_PHYS, SZ_32M), }; @@ -199,18 +174,126 @@ static struct irda_platform_data assabet_irda_data = { .set_speed = assabet_irda_set_speed, }; +static struct ucb1x00_plat_data assabet_ucb1x00_data = { + .reset = assabet_ucb1x00_reset, + .gpio_base = -1, +}; + static struct mcp_plat_data assabet_mcp_data = { .mccr0 = MCCR0_ADM, .sclk_rate = 11981000, + .codec_pdata = &assabet_ucb1x00_data, +}; + +static void assabet_lcd_set_visual(u32 visual) +{ + u_int is_true_color = visual == FB_VISUAL_TRUECOLOR; + + if (machine_is_assabet()) { +#if 1 // phase 4 or newer Assabet's + if (is_true_color) + ASSABET_BCR_set(ASSABET_BCR_LCD_12RGB); + else + ASSABET_BCR_clear(ASSABET_BCR_LCD_12RGB); +#else + // older Assabet's + if (is_true_color) + ASSABET_BCR_clear(ASSABET_BCR_LCD_12RGB); + else + ASSABET_BCR_set(ASSABET_BCR_LCD_12RGB); +#endif + } +} + +#ifndef ASSABET_PAL_VIDEO +static void assabet_lcd_backlight_power(int on) +{ + if (on) + ASSABET_BCR_set(ASSABET_BCR_LIGHT_ON); + else + ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON); +} + +/* + * Turn on/off the backlight. When turning the backlight on, we wait + * 500us after turning it on so we don't cause the supplies to droop + * when we enable the LCD controller (and cause a hard reset.) + */ +static void assabet_lcd_power(int on) +{ + if (on) { + ASSABET_BCR_set(ASSABET_BCR_LCD_ON); + udelay(500); + } else + ASSABET_BCR_clear(ASSABET_BCR_LCD_ON); +} + +/* + * The assabet uses a sharp LQ039Q2DS54 LCD module. It is actually + * takes an RGB666 signal, but we provide it with an RGB565 signal + * instead (def_rgb_16). + */ +static struct sa1100fb_mach_info lq039q2ds54_info = { + .pixclock = 171521, .bpp = 16, + .xres = 320, .yres = 240, + + .hsync_len = 5, .vsync_len = 1, + .left_margin = 61, .upper_margin = 3, + .right_margin = 9, .lower_margin = 0, + + .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, + + .lccr0 = LCCR0_Color | LCCR0_Sngl | LCCR0_Act, + .lccr3 = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2), + + .backlight_power = assabet_lcd_backlight_power, + .lcd_power = assabet_lcd_power, + .set_visual = assabet_lcd_set_visual, +}; +#else +static void assabet_pal_backlight_power(int on) +{ + ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON); +} + +static void assabet_pal_power(int on) +{ + ASSABET_BCR_clear(ASSABET_BCR_LCD_ON); +} + +static struct sa1100fb_mach_info pal_info = { + .pixclock = 67797, .bpp = 16, + .xres = 640, .yres = 512, + + .hsync_len = 64, .vsync_len = 6, + .left_margin = 125, .upper_margin = 70, + .right_margin = 115, .lower_margin = 36, + + .lccr0 = LCCR0_Color | LCCR0_Sngl | LCCR0_Act, + .lccr3 = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(512), + + .backlight_power = assabet_pal_backlight_power, + .lcd_power = assabet_pal_power, + .set_visual = assabet_lcd_set_visual, }; +#endif + +#ifdef CONFIG_ASSABET_NEPONSET +static struct resource neponset_resources[] = { + DEFINE_RES_MEM(0x10000000, 0x08000000), + DEFINE_RES_MEM(0x18000000, 0x04000000), + DEFINE_RES_MEM(0x40000000, SZ_8K), + DEFINE_RES_IRQ(IRQ_GPIO25), +}; +#endif static void __init assabet_init(void) { /* * Ensure that the power supply is in "high power" mode. */ - GPDR |= GPIO_GPIO16; GPSR = GPIO_GPIO16; + GPDR |= GPIO_GPIO16; /* * Ensure that these pins are set as outputs and are driving @@ -218,8 +301,16 @@ static void __init assabet_init(void) * the WS latch in the CPLD, and we don't float causing * excessive power drain. --rmk */ - GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM; GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM; + GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM; + + /* + * Also set GPIO27 as an output; this is used to clock UART3 + * via the FPGA and as otherwise has no pullups or pulldowns, + * so stop it floating. + */ + GPCR = GPIO_GPIO27; + GPDR |= GPIO_GPIO27; /* * Set up registers for sleep mode. @@ -231,8 +322,7 @@ static void __init assabet_init(void) PPDR |= PPC_TXD3 | PPC_TXD1; PPSR |= PPC_TXD3 | PPC_TXD1; - sa1100fb_lcd_power = assabet_lcd_power; - sa1100fb_backlight_power = assabet_backlight_power; + sa11x0_ppc_configure_mcp(); if (machine_has_neponset()) { /* @@ -246,9 +336,17 @@ static void __init assabet_init(void) #ifndef CONFIG_ASSABET_NEPONSET printk( "Warning: Neponset detected but full support " "hasn't been configured in the kernel\n" ); +#else + platform_device_register_simple("neponset", 0, + neponset_resources, ARRAY_SIZE(neponset_resources)); #endif } +#ifndef ASSABET_PAL_VIDEO + sa11x0_register_lcd(&lq039q2ds54_info); +#else + sa11x0_register_lcd(&pal_video); +#endif sa11x0_register_mtd(&assabet_flash_data, assabet_flash_resources, ARRAY_SIZE(assabet_flash_resources)); sa11x0_register_irda(&assabet_irda_data); @@ -412,21 +510,8 @@ static void __init assabet_map_io(void) */ Ser1SDCR0 |= SDCR0_SUS; - if (machine_has_neponset()) { -#ifdef CONFIG_ASSABET_NEPONSET - extern void neponset_map_io(void); - - /* - * We map Neponset registers even if it isn't present since - * many drivers will try to probe their stuff (and fail). - * This is still more friendly than a kernel paging request - * crash. - */ - neponset_map_io(); -#endif - } else { + if (!machine_has_neponset()) sa1100_register_uart_fns(&assabet_port_fns); - } /* * When Neponset is attached, the first UART should be @@ -449,6 +534,7 @@ MACHINE_START(ASSABET, "Intel-Assabet") .atag_offset = 0x100, .fixup = fixup_assabet, .map_io = assabet_map_io, + .nr_irqs = SA1100_NR_IRQS, .init_irq = sa1100_init_irq, .timer = &sa1100_timer, .init_machine = assabet_init, diff --git a/arch/arm/mach-sa1100/badge4.c b/arch/arm/mach-sa1100/badge4.c index b07a2c024cb7..e0f0c030258c 100644 --- a/arch/arm/mach-sa1100/badge4.c +++ b/arch/arm/mach-sa1100/badge4.c @@ -39,20 +39,27 @@ #include "generic.h" static struct resource sa1111_resources[] = { - [0] = { - .start = BADGE4_SA1111_BASE, - .end = BADGE4_SA1111_BASE + 0x00001fff, - .flags = IORESOURCE_MEM, - }, - [1] = { - .start = BADGE4_IRQ_GPIO_SA1111, - .end = BADGE4_IRQ_GPIO_SA1111, - .flags = IORESOURCE_IRQ, - }, + [0] = DEFINE_RES_MEM(BADGE4_SA1111_BASE, 0x2000), + [1] = DEFINE_RES_IRQ(BADGE4_IRQ_GPIO_SA1111), }; +static int badge4_sa1111_enable(void *data, unsigned devid) +{ + if (devid == SA1111_DEVID_USB) + badge4_set_5V(BADGE4_5V_USB, 1); + return 0; +} + +static void badge4_sa1111_disable(void *data, unsigned devid) +{ + if (devid == SA1111_DEVID_USB) + badge4_set_5V(BADGE4_5V_USB, 0); +} + static struct sa1111_platform_data sa1111_info = { - .irq_base = IRQ_BOARD_END, + .disable_devs = SA1111_DEVID_PS2_MSE, + .enable = badge4_sa1111_enable, + .disable = badge4_sa1111_disable, }; static u64 sa1111_dmamask = 0xffffffffUL; @@ -121,11 +128,8 @@ static struct flash_platform_data badge4_flash_data = { .nr_parts = ARRAY_SIZE(badge4_partitions), }; -static struct resource badge4_flash_resource = { - .start = SA1100_CS0_PHYS, - .end = SA1100_CS0_PHYS + SZ_64M - 1, - .flags = IORESOURCE_MEM, -}; +static struct resource badge4_flash_resource = + DEFINE_RES_MEM(SA1100_CS0_PHYS, SZ_64M); static int five_v_on __initdata = 0; @@ -269,11 +273,6 @@ static struct map_desc badge4_io_desc[] __initdata = { .pfn = __phys_to_pfn(0x10000000), .length = 0x00100000, .type = MT_DEVICE - }, { /* SA-1111 */ - .virtual = 0xf4000000, - .pfn = __phys_to_pfn(0x48000000), - .length = 0x00100000, - .type = MT_DEVICE } }; @@ -304,6 +303,7 @@ static void __init badge4_map_io(void) MACHINE_START(BADGE4, "Hewlett-Packard Laboratories BadgePAD 4") .atag_offset = 0x100, .map_io = badge4_map_io, + .nr_irqs = SA1100_NR_IRQS, .init_irq = sa1100_init_irq, .timer = &sa1100_timer, #ifdef CONFIG_SA1111 diff --git a/arch/arm/mach-sa1100/cerf.c b/arch/arm/mach-sa1100/cerf.c index 11bb6d0b9be3..4a61f60e0502 100644 --- a/arch/arm/mach-sa1100/cerf.c +++ b/arch/arm/mach-sa1100/cerf.c @@ -18,7 +18,6 @@ #include <linux/mtd/mtd.h> #include <linux/mtd/partitions.h> -#include <asm/irq.h> #include <mach/hardware.h> #include <asm/setup.h> @@ -30,14 +29,11 @@ #include <mach/cerf.h> #include <mach/mcp.h> +#include <mach/irqs.h> #include "generic.h" static struct resource cerfuart2_resources[] = { - [0] = { - .start = 0x80030000, - .end = 0x8003ffff, - .flags = IORESOURCE_MEM, - }, + [0] = DEFINE_RES_MEM(0x80030000, SZ_64K), }; static struct platform_device cerfuart2_device = { @@ -87,11 +83,8 @@ static struct flash_platform_data cerf_flash_data = { .nr_parts = ARRAY_SIZE(cerf_partitions), }; -static struct resource cerf_flash_resource = { - .start = SA1100_CS0_PHYS, - .end = SA1100_CS0_PHYS + SZ_32M - 1, - .flags = IORESOURCE_MEM, -}; +static struct resource cerf_flash_resource = + DEFINE_RES_MEM(SA1100_CS0_PHYS, SZ_32M); static void __init cerf_init_irq(void) { @@ -128,6 +121,7 @@ static struct mcp_plat_data cerf_mcp_data = { static void __init cerf_init(void) { + sa11x0_ppc_configure_mcp(); platform_add_devices(cerf_devices, ARRAY_SIZE(cerf_devices)); sa11x0_register_mtd(&cerf_flash_data, &cerf_flash_resource, 1); sa11x0_register_mcp(&cerf_mcp_data); @@ -136,6 +130,7 @@ static void __init cerf_init(void) MACHINE_START(CERF, "Intrinsyc CerfBoard/CerfCube") /* Maintainer: support@intrinsyc.com */ .map_io = cerf_map_io, + .nr_irqs = SA1100_NR_IRQS, .init_irq = cerf_init_irq, .timer = &sa1100_timer, .init_machine = cerf_init, diff --git a/arch/arm/mach-sa1100/collie.c b/arch/arm/mach-sa1100/collie.c index fd5652118ed1..48885b7efd6b 100644 --- a/arch/arm/mach-sa1100/collie.c +++ b/arch/arm/mach-sa1100/collie.c @@ -22,15 +22,17 @@ #include <linux/tty.h> #include <linux/delay.h> #include <linux/platform_device.h> +#include <linux/mfd/ucb1x00.h> #include <linux/mtd/mtd.h> #include <linux/mtd/partitions.h> #include <linux/timer.h> #include <linux/gpio.h> #include <linux/pda_power.h> +#include <video/sa1100fb.h> + #include <mach/hardware.h> #include <asm/mach-types.h> -#include <asm/irq.h> #include <asm/page.h> #include <asm/setup.h> #include <mach/collie.h> @@ -44,15 +46,12 @@ #include <asm/mach/sharpsl_param.h> #include <asm/hardware/locomo.h> #include <mach/mcp.h> +#include <mach/irqs.h> #include "generic.h" static struct resource collie_scoop_resources[] = { - [0] = { - .start = 0x40800000, - .end = 0x40800fff, - .flags = IORESOURCE_MEM, - }, + [0] = DEFINE_RES_MEM(0x40800000, SZ_4K), }; static struct scoop_config collie_scoop_setup = { @@ -85,10 +84,14 @@ static struct scoop_pcmcia_config collie_pcmcia_config = { .num_devs = 1, }; +static struct ucb1x00_plat_data collie_ucb1x00_data = { + .gpio_base = COLLIE_TC35143_GPIO_BASE, +}; + static struct mcp_plat_data collie_mcp_data = { .mccr0 = MCCR0_ADM | MCCR0_ExtClk, .sclk_rate = 9216000, - .gpio_base = COLLIE_TC35143_GPIO_BASE, + .codec_pdata = &collie_ucb1x00_data, }; /* @@ -221,16 +224,8 @@ device_initcall(collie_uart_init); static struct resource locomo_resources[] = { - [0] = { - .start = 0x40000000, - .end = 0x40001fff, - .flags = IORESOURCE_MEM, - }, - [1] = { - .start = IRQ_GPIO25, - .end = IRQ_GPIO25, - .flags = IORESOURCE_IRQ, - }, + [0] = DEFINE_RES_MEM(0x40000000, SZ_8K), + [1] = DEFINE_RES_IRQ(IRQ_GPIO25), }; static struct locomo_platform_data locomo_info = { @@ -303,11 +298,21 @@ static struct flash_platform_data collie_flash_data = { }; static struct resource collie_flash_resources[] = { - { - .start = SA1100_CS0_PHYS, - .end = SA1100_CS0_PHYS + SZ_32M - 1, - .flags = IORESOURCE_MEM, - } + DEFINE_RES_MEM(SA1100_CS0_PHYS, SZ_32M), +}; + +static struct sa1100fb_mach_info collie_lcd_info = { + .pixclock = 171521, .bpp = 16, + .xres = 320, .yres = 240, + + .hsync_len = 5, .vsync_len = 1, + .left_margin = 11, .upper_margin = 2, + .right_margin = 30, .lower_margin = 0, + + .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, + + .lccr0 = LCCR0_Color | LCCR0_Sngl | LCCR0_Act, + .lccr3 = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2), }; static void __init collie_init(void) @@ -341,6 +346,10 @@ static void __init collie_init(void) collie_power_resource[0].start = gpio_to_irq(COLLIE_GPIO_AC_IN); collie_power_resource[0].end = gpio_to_irq(COLLIE_GPIO_AC_IN); + + sa11x0_ppc_configure_mcp(); + + platform_scoop_config = &collie_pcmcia_config; ret = platform_add_devices(devices, ARRAY_SIZE(devices)); @@ -348,6 +357,7 @@ static void __init collie_init(void) printk(KERN_WARNING "collie: Unable to register LoCoMo device\n"); } + sa11x0_register_lcd(&collie_lcd_info); sa11x0_register_mtd(&collie_flash_data, collie_flash_resources, ARRAY_SIZE(collie_flash_resources)); sa11x0_register_mcp(&collie_mcp_data); @@ -383,6 +393,7 @@ static void __init collie_map_io(void) MACHINE_START(COLLIE, "Sharp-Collie") .map_io = collie_map_io, + .nr_irqs = SA1100_NR_IRQS, .init_irq = sa1100_init_irq, .timer = &sa1100_timer, .init_machine = collie_init, diff --git a/arch/arm/mach-sa1100/dma.c b/arch/arm/mach-sa1100/dma.c deleted file mode 100644 index ad660350c296..000000000000 --- a/arch/arm/mach-sa1100/dma.c +++ /dev/null @@ -1,348 +0,0 @@ -/* - * arch/arm/mach-sa1100/dma.c - * - * Support functions for the SA11x0 internal DMA channels. - * - * Copyright (C) 2000, 2001 by Nicolas Pitre - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/module.h> -#include <linux/interrupt.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/errno.h> - -#include <asm/system.h> -#include <asm/irq.h> -#include <mach/hardware.h> -#include <mach/dma.h> - - -#undef DEBUG -#ifdef DEBUG -#define DPRINTK( s, arg... ) printk( "dma<%p>: " s, regs , ##arg ) -#else -#define DPRINTK( x... ) -#endif - - -typedef struct { - const char *device_id; /* device name */ - u_long device; /* this channel device, 0 if unused*/ - dma_callback_t callback; /* to call when DMA completes */ - void *data; /* ... with private data ptr */ -} sa1100_dma_t; - -static sa1100_dma_t dma_chan[SA1100_DMA_CHANNELS]; - -static DEFINE_SPINLOCK(dma_list_lock); - - -static irqreturn_t dma_irq_handler(int irq, void *dev_id) -{ - dma_regs_t *dma_regs = dev_id; - sa1100_dma_t *dma = dma_chan + (((u_int)dma_regs >> 5) & 7); - int status = dma_regs->RdDCSR; - - if (status & (DCSR_ERROR)) { - printk(KERN_CRIT "DMA on \"%s\" caused an error\n", dma->device_id); - dma_regs->ClrDCSR = DCSR_ERROR; - } - - dma_regs->ClrDCSR = status & (DCSR_DONEA | DCSR_DONEB); - if (dma->callback) { - if (status & DCSR_DONEA) - dma->callback(dma->data); - if (status & DCSR_DONEB) - dma->callback(dma->data); - } - return IRQ_HANDLED; -} - - -/** - * sa1100_request_dma - allocate one of the SA11x0's DMA channels - * @device: The SA11x0 peripheral targeted by this request - * @device_id: An ascii name for the claiming device - * @callback: Function to be called when the DMA completes - * @data: A cookie passed back to the callback function - * @dma_regs: Pointer to the location of the allocated channel's identifier - * - * This function will search for a free DMA channel and returns the - * address of the hardware registers for that channel as the channel - * identifier. This identifier is written to the location pointed by - * @dma_regs. The list of possible values for @device are listed into - * arch/arm/mach-sa1100/include/mach/dma.h as a dma_device_t enum. - * - * Note that reading from a port and writing to the same port are - * actually considered as two different streams requiring separate - * DMA registrations. - * - * The @callback function is called from interrupt context when one - * of the two possible DMA buffers in flight has terminated. That - * function has to be small and efficient while posponing more complex - * processing to a lower priority execution context. - * - * If no channels are available, or if the desired @device is already in - * use by another DMA channel, then an error code is returned. This - * function must be called before any other DMA calls. - **/ - -int sa1100_request_dma (dma_device_t device, const char *device_id, - dma_callback_t callback, void *data, - dma_regs_t **dma_regs) -{ - sa1100_dma_t *dma = NULL; - dma_regs_t *regs; - int i, err; - - *dma_regs = NULL; - - err = 0; - spin_lock(&dma_list_lock); - for (i = 0; i < SA1100_DMA_CHANNELS; i++) { - if (dma_chan[i].device == device) { - err = -EBUSY; - break; - } else if (!dma_chan[i].device && !dma) { - dma = &dma_chan[i]; - } - } - if (!err) { - if (dma) - dma->device = device; - else - err = -ENOSR; - } - spin_unlock(&dma_list_lock); - if (err) - return err; - - i = dma - dma_chan; - regs = (dma_regs_t *)&DDAR(i); - err = request_irq(IRQ_DMA0 + i, dma_irq_handler, IRQF_DISABLED, - device_id, regs); - if (err) { - printk(KERN_ERR - "%s: unable to request IRQ %d for %s\n", - __func__, IRQ_DMA0 + i, device_id); - dma->device = 0; - return err; - } - - *dma_regs = regs; - dma->device_id = device_id; - dma->callback = callback; - dma->data = data; - - regs->ClrDCSR = - (DCSR_DONEA | DCSR_DONEB | DCSR_STRTA | DCSR_STRTB | - DCSR_IE | DCSR_ERROR | DCSR_RUN); - regs->DDAR = device; - - return 0; -} - - -/** - * sa1100_free_dma - free a SA11x0 DMA channel - * @regs: identifier for the channel to free - * - * This clears all activities on a given DMA channel and releases it - * for future requests. The @regs identifier is provided by a - * successful call to sa1100_request_dma(). - **/ - -void sa1100_free_dma(dma_regs_t *regs) -{ - int i; - - for (i = 0; i < SA1100_DMA_CHANNELS; i++) - if (regs == (dma_regs_t *)&DDAR(i)) - break; - if (i >= SA1100_DMA_CHANNELS) { - printk(KERN_ERR "%s: bad DMA identifier\n", __func__); - return; - } - - if (!dma_chan[i].device) { - printk(KERN_ERR "%s: Trying to free free DMA\n", __func__); - return; - } - - regs->ClrDCSR = - (DCSR_DONEA | DCSR_DONEB | DCSR_STRTA | DCSR_STRTB | - DCSR_IE | DCSR_ERROR | DCSR_RUN); - free_irq(IRQ_DMA0 + i, regs); - dma_chan[i].device = 0; -} - - -/** - * sa1100_start_dma - submit a data buffer for DMA - * @regs: identifier for the channel to use - * @dma_ptr: buffer physical (or bus) start address - * @size: buffer size - * - * This function hands the given data buffer to the hardware for DMA - * access. If another buffer is already in flight then this buffer - * will be queued so the DMA engine will switch to it automatically - * when the previous one is done. The DMA engine is actually toggling - * between two buffers so at most 2 successful calls can be made before - * one of them terminates and the callback function is called. - * - * The @regs identifier is provided by a successful call to - * sa1100_request_dma(). - * - * The @size must not be larger than %MAX_DMA_SIZE. If a given buffer - * is larger than that then it's the caller's responsibility to split - * it into smaller chunks and submit them separately. If this is the - * case then a @size of %CUT_DMA_SIZE is recommended to avoid ending - * up with too small chunks. The callback function can be used to chain - * submissions of buffer chunks. - * - * Error return values: - * %-EOVERFLOW: Given buffer size is too big. - * %-EBUSY: Both DMA buffers are already in use. - * %-EAGAIN: Both buffers were busy but one of them just completed - * but the interrupt handler has to execute first. - * - * This function returs 0 on success. - **/ - -int sa1100_start_dma(dma_regs_t *regs, dma_addr_t dma_ptr, u_int size) -{ - unsigned long flags; - u_long status; - int ret; - - if (dma_ptr & 3) - printk(KERN_WARNING "DMA: unaligned start address (0x%08lx)\n", - (unsigned long)dma_ptr); - - if (size > MAX_DMA_SIZE) - return -EOVERFLOW; - - local_irq_save(flags); - status = regs->RdDCSR; - - /* If both DMA buffers are started, there's nothing else we can do. */ - if ((status & (DCSR_STRTA | DCSR_STRTB)) == (DCSR_STRTA | DCSR_STRTB)) { - DPRINTK("start: st %#x busy\n", status); - ret = -EBUSY; - goto out; - } - - if (((status & DCSR_BIU) && (status & DCSR_STRTB)) || - (!(status & DCSR_BIU) && !(status & DCSR_STRTA))) { - if (status & DCSR_DONEA) { - /* give a chance for the interrupt to be processed */ - ret = -EAGAIN; - goto out; - } - regs->DBSA = dma_ptr; - regs->DBTA = size; - regs->SetDCSR = DCSR_STRTA | DCSR_IE | DCSR_RUN; - DPRINTK("start a=%#x s=%d on A\n", dma_ptr, size); - } else { - if (status & DCSR_DONEB) { - /* give a chance for the interrupt to be processed */ - ret = -EAGAIN; - goto out; - } - regs->DBSB = dma |