diff options
Diffstat (limited to 'recipes/linux/linux/acern30/wingel-hacking.patch')
| -rw-r--r-- | recipes/linux/linux/acern30/wingel-hacking.patch | 1146 |
1 files changed, 1146 insertions, 0 deletions
diff --git a/recipes/linux/linux/acern30/wingel-hacking.patch b/recipes/linux/linux/acern30/wingel-hacking.patch new file mode 100644 index 0000000000..e87de5a460 --- /dev/null +++ b/recipes/linux/linux/acern30/wingel-hacking.patch @@ -0,0 +1,1146 @@ +This patch contains some hacks that I'm playing around with right now. + +This isn't anything that should be merged into the official kernel. + +Index: linux-2.6.14/arch/arm/mach-s3c2410/mach-n30.c +=================================================================== +--- linux-2.6.14.orig/arch/arm/mach-s3c2410/mach-n30.c ++++ linux-2.6.14/arch/arm/mach-s3c2410/mach-n30.c +@@ -22,6 +22,12 @@ + * published by the Free Software Foundation. + */ + ++// #define USBHACK 1 ++#define SPIHACK 1 ++ ++void s3c2410_capture_regs(void); ++void s3c2410_dump_regs(void); ++ + #include <linux/kernel.h> + #include <linux/types.h> + #include <linux/interrupt.h> +@@ -272,14 +278,18 @@ static struct s3c2410_button n35_buttons + + { IRQ_EINT13, S3C2410_GPG5, S3C2410_GPG5_EINT13, KEY_LEFT, + "Left_arrow", 0 }, ++#ifndef SPIHACK + { IRQ_EINT14, S3C2410_GPG6, S3C2410_GPG6_EINT14, KEY_RIGHT, + "Right_arrow", 0 }, ++#endif + { IRQ_EINT17, S3C2410_GPG9, S3C2410_GPG9_EINT17, KEY_UP, + "Up_arrow", 0 }, + { IRQ_EINT16, S3C2410_GPG8, S3C2410_GPG8_EINT16, KEY_DOWN, + "Down_arrow", 0 }, ++#ifndef SPIHACK + { IRQ_EINT15, S3C2410_GPG7, S3C2410_GPG7_EINT15, KEY_ENTER, + "Select", 0 }, ++#endif + + { IRQ_EINT7, S3C2410_GPF7, S3C2410_GPF7_EINT7, KEY_HOMEPAGE, + "Home", 0 }, +@@ -367,7 +377,6 @@ static struct platform_device *n30_devic + &s3c_device_usbgadget, + &s3c_device_sdi, + &s3c_device_nand, +- &s3c_device_spi1, + }; + + static struct s3c2410_platform_i2c n30_i2ccfg = { +@@ -382,6 +391,27 @@ static struct s3c24xx_board n30_board __ + .devices_count = ARRAY_SIZE(n30_devices) + }; + ++static struct platform_device *n35_devices[] __initdata = { ++ &s3c_device_lcd, ++ &s3c_device_bl, ++ &s3c_device_ts, ++ &s3c_device_buttons, ++ &s3c_device_wdt, ++ &s3c_device_i2c, ++ &s3c_device_iis, ++ &s3c_device_usbgadget, ++ &s3c_device_sdi, ++ &s3c_device_nand, ++#ifdef SPIHACK ++ &s3c_device_spi1, ++#endif ++}; ++ ++static struct s3c24xx_board n35_board __initdata = { ++ .devices = n35_devices, ++ .devices_count = ARRAY_SIZE(n35_devices) ++}; ++ + /* Lots of hardcoded stuff, but it sets up the hardware in a useful + * state so that we can boot Linux directly from flash. */ + static void __init n30_hwinit(void) +@@ -674,7 +704,10 @@ static void __init n30_map_io(void) + n30_hwinit(); + s3c24xx_init_clocks(0); + s3c24xx_init_uarts(n30_uartcfgs, ARRAY_SIZE(n30_uartcfgs)); +- s3c24xx_set_board(&n30_board); ++ if (machine_is_n30()) ++ s3c24xx_set_board(&n30_board); ++ if (machine_is_n35()) ++ s3c24xx_set_board(&n35_board); + } + + static void __init n30_init_irq(void) +@@ -710,90 +743,6 @@ static int n30_usbstart_thread(void *unu + return 0; + } + +-static int spi_thread(void *regs) +-{ +- unsigned sptdat1 = ~0, sprdat1 = ~0, spsta1 = ~0; +- unsigned value; +- +- writel(0x01, regs + S3C2410_SPCON); +- writel(0x02, regs + S3C2410_SPPIN); +- +- s3c2410_gpio_cfgpin(S3C2410_GPG6, S3C2410_GPG6_SPIMOSI1); +- s3c2410_gpio_cfgpin(S3C2410_GPG7, S3C2410_GPG7_SPICLK1); +- +- s3c2410_gpio_cfgpin(S3C2410_GPG3, 0x3 << 6); +- +- printk("GPGCON=0x%x\n", readl(S3C2410_GPGCON)); +- +- msleep(10); +- +- while (1) { +- value = readl(regs + S3C2410_SPTDAT); +- if (sptdat1 != value) { +- printk(KERN_INFO "SPTDAT1=0x%x\n", value); +- sptdat1 = value; +- } +- value = readl(regs + S3C2410_SPRDAT); +- if (sprdat1 != value) { +- printk(KERN_INFO "SPRDAT1=0x%x\n", value); +- sprdat1 = value; +- } +- value = readl(regs + S3C2410_SPSTA); +- if (spsta1 != value) { +- printk(KERN_INFO "SPSTA1=0x%x\n", value); +- spsta1 = value; +- } +- +- msleep(10); +- } +-} +- +-static int s3c24xx_spi_probe(struct device *dev) +-{ +- struct platform_device *pdev = to_platform_device(dev); +- struct resource *res; +- int ret; +- void *regs; +- struct resource *ioarea; +- +- res = platform_get_resource(pdev, IORESOURCE_MEM, 0); +- if (res == NULL) { +- dev_err(dev, "cannot find IO resource\n"); +- ret = -ENOENT; +- goto out; +- } +- +- ioarea = request_mem_region(res->start, (res->end-res->start)+1, +- pdev->name); +- if (ioarea == NULL) { +- dev_err(dev, "cannot request IO\n"); +- ret = -ENXIO; +- goto out; +- } +- +- regs = ioremap(res->start, (res->end-res->start)+1); +- if (regs == NULL) { +- dev_err(dev, "cannot map IO\n"); +- ret = -ENXIO; +- goto out; +- } +- +- dev_info(dev, "registers %p (%p, %p)\n", regs, ioarea, res); +- +- kthread_run(spi_thread, regs, "spi_debug"); +- +- ret = 0; +- +- out: +- return ret; +-} +- +-static struct device_driver s3c24xx_spi_driver = { +- .name = "s3c2410-spi", +- .bus = &platform_bus_type, +- .probe = s3c24xx_spi_probe, +-}; +- + #ifdef CONFIG_APM + static void n30_get_power_status(struct apm_power_info *info) + { +@@ -825,6 +774,128 @@ static void n30_get_power_status(struct + } + #endif + ++#define DEBUG_GPIO 1 ++ ++#ifdef DEBUG_GPIO ++static int n30_debug_thread(void *unused) ++{ ++ int i; ++#define PIN(x) { x, #x } ++ static struct pin { ++ unsigned int pin; ++ const char *name; ++ } pins[] = { ++ PIN(S3C2410_GPA12), ++ PIN(S3C2410_GPB2), ++ PIN(S3C2410_GPB4), ++ PIN(S3C2410_GPB5), ++ PIN(S3C2410_GPB6), ++ PIN(S3C2410_GPB7), ++ PIN(S3C2410_GPC0), ++ PIN(S3C2410_GPC3), ++ PIN(S3C2410_GPC6), ++ PIN(S3C2410_GPC7), ++ PIN(S3C2410_GPC8), ++ PIN(S3C2410_GPD0), ++ PIN(S3C2410_GPD8), ++ PIN(S3C2410_GPD9), ++ PIN(S3C2410_GPD10), ++ PIN(S3C2410_GPE11), ++ PIN(S3C2410_GPE12), ++ PIN(S3C2410_GPE13), ++ PIN(S3C2410_GPF0), ++ PIN(S3C2410_GPF1), ++ PIN(S3C2410_GPF2), ++ PIN(S3C2410_GPF3), ++ PIN(S3C2410_GPG0), ++ PIN(S3C2410_GPG1), ++ PIN(S3C2410_GPG2), ++ PIN(S3C2410_GPG3), ++ PIN(S3C2410_GPG4), ++ PIN(S3C2410_GPH8), ++ }; ++#undef PIN ++ enum { PIN_CNT = (sizeof(pins) / sizeof(struct pin)) }; ++ static int values[PIN_CNT]; ++ static int changes[PIN_CNT]; ++ ++ set_current_state(TASK_INTERRUPTIBLE); ++ schedule_timeout(1 * HZ); ++ ++// s3c2410_dump_regs(); ++ ++ printk("AFTER\n"); ++ ++ s3c2410_capture_regs(); ++ ++// s3c2410_dump_regs(); ++ ++ for (i = 0; i < PIN_CNT; i++) ++ values[i] = s3c2410_gpio_getpin(pins[i].pin) ? 1 : 0; ++ ++ printk("MISCCR=0x%08x\n", readl(S3C2410_MISCCR)); ++ ++ while (!kthread_should_stop()) { ++ for (i = 0; i < PIN_CNT; i++) { ++ int value = s3c2410_gpio_getpin(pins[i].pin) ? 1 : 0; ++ ++ if (values[i] != value && changes[i] < 100) { ++ changes[i]++; ++ values[i] = value; ++ printk(KERN_CRIT "%s: %d (%d)\n", pins[i].name, value, changes[i]); ++ } ++ } ++ ++ if (0) { ++ s3c2410_gpio_pullup(S3C2410_GPE15, 1); ++ s3c2410_gpio_cfgpin(S3C2410_GPE15, S3C2410_GPE15_OUTP); ++ s3c2410_gpio_setpin(S3C2410_GPE15, !s3c2410_gpio_getpin(S3C2410_GPE15)); ++ } ++ ++ if (0) ++ s3c2410_gpio_setpin(S3C2410_GPB3, !s3c2410_gpio_getpin(S3C2410_GPB3)); ++ ++ if (1) { ++ static int last_f0; ++ int f0 = s3c2410_gpio_getpin(S3C2410_GPF0); ++ ++ if (last_f0 != f0) { ++ last_f0 = f0; ++ if (!f0) { ++ int r; ++ printk("entering suspend\n"); ++ r = pm_suspend(PM_SUSPEND_MEM); ++ printk("after suspend %d\n", r); ++ } ++ } ++ } ++ ++ ++ if (0) { ++ static int last_f6; ++ int f6 = s3c2410_gpio_getpin(S3C2410_GPF6); ++ ++ if (last_f6 != f6) { ++ last_f6 = f6; ++ if (!f6) { ++ if (s3c2410_gpio_getcfg(S3C2410_GPB6) != S3C2410_GPB6_OUTP) { ++ printk("B6 configured as output"); ++ s3c2410_gpio_cfgpin(S3C2410_GPB6, S3C2410_GPB6_OUTP); ++ } else { ++ printk("B6 configured as input"); ++ s3c2410_gpio_cfgpin(S3C2410_GPB6, S3C2410_GPB6_INP); ++ } ++ } ++ } ++ } ++ ++ msleep(10); ++ } ++ ++ return 0; ++} ++#endif ++ + static void __init n30_init(void) + { + s3c24xx_fb_set_platdata(&n30_lcdcfg); +@@ -846,9 +917,6 @@ static void __init n30_init(void) + memcpy_toio(N30_RESUME_VA, (void *)n30_resume, + &n30_resume_end - (void *)n30_resume); + +- if (driver_register(&s3c24xx_spi_driver) < 0) +- printk(KERN_ERR "failed to register spi driver\n"); +- + /* Clear any locks and write protects on the flash. */ + s3c2410_gpio_setpin(S3C2410_GPC5, 1); + msleep(1); +@@ -861,6 +929,8 @@ static void __init n30_init(void) + #ifdef CONFIG_APM + apm_get_power_status = n30_get_power_status; + #endif ++ ++ kthread_run(n30_debug_thread, NULL, "n30_debug"); + } + + MACHINE_START(N30, "Acer-N30") +Index: linux-2.6.14/arch/arm/mach-s3c2410/Makefile +=================================================================== +--- linux-2.6.14.orig/arch/arm/mach-s3c2410/Makefile ++++ linux-2.6.14/arch/arm/mach-s3c2410/Makefile +@@ -46,3 +46,5 @@ obj-$(CONFIG_MACH_NEXCODER_2440) += mach + obj-y += gpio-sysfs.o + obj-y += regdump.o + ++obj-m += spi-int.o ++obj-m += spi-dma.o +Index: linux-2.6.14/arch/arm/mach-s3c2410/spi-int.c +=================================================================== +--- /dev/null ++++ linux-2.6.14/arch/arm/mach-s3c2410/spi-int.c +@@ -0,0 +1,261 @@ ++#include <linux/kernel.h> ++#include <linux/module.h> ++#include <linux/types.h> ++#include <linux/interrupt.h> ++#include <linux/init.h> ++#include <linux/device.h> ++#include <linux/kthread.h> ++#include <linux/delay.h> ++ ++#include <asm/io.h> ++#include <asm/irq.h> ++ ++#include <asm/hardware/clock.h> ++ ++#include <asm/arch/regs-gpio.h> ++#include <asm/arch/regs-spi.h> ++#include <asm/arch/regs-irq.h> ++ ++struct spi_info { ++ void *regs; ++ struct device *dev; ++ struct clk *clk; ++ struct resource *ioarea; ++ struct resource *irq; ++ struct task_struct *debug_thread; ++}; ++ ++static int spi_debug_thread(void *data) ++{ ++ struct spi_info *info = data; ++ unsigned sptdat1 = ~0, sprdat1 = ~0, spsta1 = ~0; ++ unsigned value; ++ ++ while (!kthread_should_stop()) { ++ if (1) { ++ value = readl(info->regs + S3C2410_SPTDAT); ++ if (sptdat1 != value) { ++ printk(KERN_INFO "SPTDAT1=0x%x\n", value); ++ sptdat1 = value; ++ } ++ value = readl(info->regs + S3C2410_SPRDAT); ++ if (sprdat1 != value) { ++ printk(KERN_INFO "SPRDAT1=0x%x\n", value); ++ sprdat1 = value; ++ } ++ value = readl(info->regs + S3C2410_SPSTA); ++ if (spsta1 != value) { ++ printk("SRCPND=0x%08x\n", readl(S3C2410_SRCPND)); ++ printk("INTMOD=0x%08x\n", readl(S3C2410_INTMOD)); ++ printk("INTMSK=0x%08x\n", readl(S3C2410_INTMSK)); ++ printk("INTPND=0x%08x\n", readl(S3C2410_INTPND)); ++ ++ printk(KERN_INFO "SPSTA1=0x%x\n", value); ++ spsta1 = value; ++ } ++ } ++ if (1) { ++ if (readl(info->regs + S3C2410_SPSTA) & S3C2410_SPSTA_READY) { ++ value = readl(info->regs + S3C2410_SPRDAT); ++ printk("DAT=0x%02x\n", value); ++ writel(1, info->regs + S3C2410_SPTDAT); ++ } ++ } ++ ++ msleep(1); ++ } ++ ++ return 0; ++} ++ ++static irqreturn_t spi_int_irq(int irq, void *dev_id, struct pt_regs *regs) ++{ ++ struct spi_info *info = dev_id; ++ unsigned long status; ++ ++ status = readl(info->regs + S3C2410_SPSTA); ++ ++ if (status & S3C2410_SPSTA_READY) { ++ printk("INT %02x\n", readb(info->regs + S3C2410_SPRDAT)); ++ writeb(0xff, info->regs + S3C2410_SPTDAT); ++ } ++ ++ return IRQ_HANDLED; ++} ++ ++static void spi_int_free(struct spi_info *info) ++{ ++ if (!info) ++ return; ++ ++ if (info->debug_thread) ++ kthread_stop(info->debug_thread); ++ if (info->irq) ++ free_irq(info->irq->start, info); ++ if (info->regs) ++ iounmap(info->regs); ++ if (info->ioarea) { ++ release_resource(info->ioarea); ++ kfree(info->ioarea); ++ } ++ if (info->clk) { ++ clk_unuse(info->clk); ++ clk_disable(info->clk); ++ } ++ kfree(info); ++} ++ ++static int spi_int_probe(struct device *dev) ++{ ++ struct platform_device *pdev = to_platform_device(dev); ++ int ret; ++ struct spi_info *info; ++ struct resource *res; ++ ++ printk("spi_int_probe\n"); ++ ++ info = kmalloc(sizeof(struct spi_info), GFP_KERNEL); ++ if (!info) { ++ dev_err(dev, "failed to allocate info structure\n"); ++ ret = -ENOMEM; ++ goto out; ++ } ++ memset(info, 0, sizeof(*info)); ++ info->dev = dev; ++ ++ dev_info(dev, "got info %p\n", info); ++ ++ info->clk = clk_get(dev, "spi"); ++ if (IS_ERR(info->clk)) { ++ dev_err(dev, "clk_get failed\n"); ++ ret = -ENOENT; ++ goto out; ++ } ++ ++ dev_dbg(dev, "clk %p\n", info->clk); ++ ++ clk_use(info->clk); ++ clk_enable(info->clk); ++ ++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ if (!res) { ++ dev_err(dev, "unable to find registers\n"); ++ ret = -ENOENT; ++ goto out; ++ } ++ ++ dev_info(dev, "got res %p\n", res); ++ ++ info->ioarea = request_mem_region(res->start, ++ (res->end-res->start)+1, ++ pdev->name); ++ if (!info->ioarea) { ++ dev_err(dev, "request_mem_region failed\n"); ++ ret = -ENXIO; ++ goto out; ++ } ++ ++ dev_info(dev, "got ioarea %p\n", info->ioarea); ++ ++ info->regs = ioremap(res->start, (res->end-res->start)+1); ++ if (!info->regs) { ++ dev_err(dev, "ioremap failed\n"); ++ ret = -ENXIO; ++ goto out; ++ } ++ ++ dev_info(dev, "got regs %p\n", info->regs); ++ ++ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); ++ if (!res) { ++ dev_err(dev, "unable to find irq\n"); ++ ret = -ENOENT; ++ goto out; ++ } ++ ++ writel(S3C2410_SPCON_SMOD_INT /* | S3C2410_SPCON_TAGD */, ++ info->regs + S3C2410_SPCON); ++ writel(S3C2410_SPPIN_RESERVED, info->regs + S3C2410_SPPIN); ++ ++ s3c2410_gpio_cfgpin(S3C2410_GPG5, S3C2410_GPG5_SPIMISO1); ++ s3c2410_gpio_cfgpin(S3C2410_GPG6, S3C2410_GPG6_SPIMOSI1); ++ s3c2410_gpio_cfgpin(S3C2410_GPG7, S3C2410_GPG7_SPICLK1); ++ ++ s3c2410_gpio_cfgpin(S3C2410_GPG3, 0x3 << 6); ++ ++ ret = request_irq(res->start, spi_int_irq, 0, pdev->name, info); ++ if (ret) { ++ dev_err(dev, "request_irq failed\n"); ++ goto out; ++ } ++ info->irq = res; ++ ++ dev_info(dev, "got irq %ld\n", info->irq->start); ++ ++ dev_info(dev, "SPI driver active\n"); ++ ++ dev_set_drvdata(dev, info); ++ ret = 0; ++ ++ writeb(0x00, info->regs + S3C2410_SPTDAT); ++ ++ if (0) { ++ info->debug_thread = kthread_run(spi_debug_thread, info, ++ "spi_debug_thread"); ++ } ++ ++ printk("SRCPND=0x%08x\n", readl(S3C2410_SRCPND)); ++ printk("INTMOD=0x%08x\n", readl(S3C2410_INTMOD)); ++ printk("INTMSK=0x%08x\n", readl(S3C2410_INTMSK)); ++ printk("INTPND=0x%08x\n", readl(S3C2410_INTPND)); ++ printk("EINTMASK=0x%08x\n", readl(S3C2410_EINTMASK)); ++ ++ printk("SPCON=0x%08x\n", readl(info->regs + S3C2410_SPCON)); ++ __raw_writel(S3C2410_SPCON_SMOD_INT | S3C2410_SPCON_TAGD, ++ info->regs + S3C2410_SPCON); ++ printk("SPCON=0x%08x\n", readl(info->regs + S3C2410_SPCON)); ++ printk("FOO=0x%08x\n", S3C2410_SPCON_SMOD_INT); ++ ++ out: ++ if (ret) ++ spi_int_free(info); ++ ++ return ret; ++} ++ ++static int spi_int_remove(struct device *dev) ++{ ++ struct spi_info *info = dev_get_drvdata(dev); ++ ++ dev_set_drvdata(dev, NULL); ++ ++ spi_int_free(info); ++ ++ return 0; ++} ++ ++static struct device_driver spi_int_driver = { ++ .name = "s3c2410-spi", ++ .bus = &platform_bus_type, ++ .probe = spi_int_probe, ++ .remove = spi_int_remove, ++}; ++ ++static int __init spi_int_init(void) ++{ ++ printk("SPI interrput driver loaded\n"); ++ ++ return driver_register(&spi_int_driver); ++} ++ ++static void __exit spi_int_exit(void) ++{ ++ driver_unregister(&spi_int_driver); ++} ++ ++module_init(spi_int_init); ++module_exit(spi_int_exit); ++ ++MODULE_DESCRIPTION("S3C2410 interrupt driven SPI driver"); ++MODULE_AUTHOR("Christer Weinigel <christer@weinigel.se>"); ++MODULE_LICENSE("GPL"); +Index: linux-2.6.14/arch/arm/mach-s3c2410/devs.c +=================================================================== +--- linux-2.6.14.orig/arch/arm/mach-s3c2410/devs.c ++++ linux-2.6.14/arch/arm/mach-s3c2410/devs.c +@@ -400,11 +400,17 @@ static struct resource s3c_spi0_resource + + }; + ++static u64 s3c_device_spi0_dmamask = 0xffffffffUL; ++ + struct platform_device s3c_device_spi0 = { + .name = "s3c2410-spi", + .id = 0, + .num_resources = ARRAY_SIZE(s3c_spi0_resource), + .resource = s3c_spi0_resource, ++ .dev = { ++ .dma_mask = &s3c_device_spi0_dmamask, ++ .coherent_dma_mask = 0xffffffffUL ++ } + }; + + EXPORT_SYMBOL(s3c_device_spi0); +@@ -425,11 +431,17 @@ static struct resource s3c_spi1_resource + + }; + ++static u64 s3c_device_spi1_dmamask = 0xffffffffUL; ++ + struct platform_device s3c_device_spi1 = { + .name = "s3c2410-spi", + .id = 1, + .num_resources = ARRAY_SIZE(s3c_spi1_resource), + .resource = s3c_spi1_resource, ++ .dev = { ++ .dma_mask = &s3c_device_spi1_dmamask, ++ .coherent_dma_mask = 0xffffffffUL ++ } + }; + + EXPORT_SYMBOL(s3c_device_spi1); +Index: linux-2.6.14/arch/arm/mach-s3c2410/spi-dma.c +=================================================================== +--- /dev/null ++++ linux-2.6.14/arch/arm/mach-s3c2410/spi-dma.c +@@ -0,0 +1,498 @@ ++#include <linux/kernel.h> ++#include <linux/module.h> ++#include <linux/types.h> ++#include <linux/interrupt.h> ++#include <linux/init.h> ++#include <linux/device.h> ++#include <linux/kthread.h> ++#include <linux/delay.h> ++#include <linux/dma-mapping.h> ++#include <linux/spinlock.h> ++ ++#include <asm/uaccess.h> ++#include <asm/dma.h> ++#include <asm/io.h> ++#include <asm/irq.h> ++ ++#include <asm/hardware/clock.h> ++ ++#include <asm/arch/dma.h> ++#include <asm/arch/regs-gpio.h> ++#include <asm/arch/regs-spi.h> ++ ++#define BUFFER_SIZE (1024*1024) ++#define CHUNK_SIZE (64*1024) ++#define NUM_CHUNKS (BUFFER_SIZE / CHUNK_SIZE) ++ ++static char spi_dma_name[] = "s3c2410-spi-dma-reader"; ++ ++static struct s3c2410_dma_client spi_dma_client = { ++ .name = spi_dma_name, ++}; ++ ++struct spi_dma_state { ++ struct spi_dma_info *info; ++ int status; /* 0=inactive, 1=running, <0 = -errno */ ++ unsigned tail; ++}; ++ ++struct spi_chunk { ++ int index; ++ dma_addr_t handle; ++ struct spi_dma_info *info; ++}; ++ ++struct spi_dma_info { ++ void *cpu_addr; ++ dma_addr_t handle; ++ size_t size; ++ ++ spinlock_t head_lock; ++ unsigned head; ++ wait_queue_head_t wait_q; ++ ++ void *regs; ++ ++ struct device *dev; ++ struct clk *clk; ++ struct resource *iomem; ++ int major; ++ dmach_t dmach; ++ int dcon; ++ int flushing; ++ char have_dma; ++ struct spi_chunk chunks[NUM_CHUNKS]; ++}; ++ ++static void spi_queue_dma(struct spi_chunk *chunk) ++{ ++ s3c2410_dma_enqueue(chunk->info->dmach, ++ chunk, chunk->handle, CHUNK_SIZE); ++} ++ ++static void spi_dma_done_callback(s3c2410_dma_chan_t *dma_ch, void *buf_id, ++ int size, s3c2410_dma_buffresult_t result) ++{ ++ struct spi_chunk *chunk = buf_id; ++ struct spi_dma_info *info = chunk->info; ++ ++ if (info->flushing) ++ return; ++ ++ spin_lock(&info->head_lock); ++ if ((info->head / CHUNK_SIZE) % NUM_CHUNKS != chunk->index) ++ dev_warn(info->dev, "out of sync, head=0x%x, index=0x%x\n", ++ info->head, chunk->index); ++ ++ info->head += size; ++ spin_unlock(&info->head_lock); ++ ++ wake_up_interruptible(&info->wait_q); ++ ++ spi_queue_dma(chunk); ++} ++ ++static struct spi_dma_info *global_info; ++ ++static ssize_t spi_dma_read(struct file *file, char __user *buf, ++ size_t len, loff_t *ppos) ++{ ++ DECLARE_WAITQUEUE(wait, current); ++ struct spi_dma_state *state = file->private_data; ++ struct spi_dma_info *info = state->info; ++ unsigned head; ++ ssize_t start, end; ++ ssize_t n; ++ ++ if (state->status <= 0) { ++ if (state->status) { ++ state->status = 0; ++ return state->status; ++ } ++ state->tail = info->head; ++ state->status = 1; ++ } ++ ++ add_wait_queue(&info->wait_q, &wait); ++ while (1) { ++ set_current_state(TASK_INTERRUPTIBLE); ++ if ((head = info->head) != state->tail) ++ break; ++ if (signal_pending(current)) ++ break; ++ schedule(); ++ } ++ remove_wait_queue(&info->wait_q, &wait); ++ set_current_state(TASK_RUNNING); ++ ++ if (signal_pending(current)) ++ return -EINTR; ++ ++ if ((head - state->tail) > BUFFER_SIZE) ++ return -ENOBUFS; ++ ++ start = state->tail % BUFFER_SIZE; ++ end = head % BUFFER_SIZE; ++ ++ if (end > start) ++ n = end - start; ++ else ++ n = BUFFER_SIZE - start; ++ ++ if (n > len) ++ n = len; ++ ++ if (copy_to_user(buf, info->cpu_addr + start, n)) ++ return -EFAULT; ++ ++ state->tail += n; ++ ++ return n; ++} ++ ++static int spi_dma_mmap(struct file *file, struct vm_area_struct *vma) ++{ ++ struct spi_dma_state *state = file->private_data; ++ struct spi_dma_info *info = state->info; ++ ++ return dma_mmap_coherent(info->dev, vma, ++ info->cpu_addr, info->handle, info->size); ++} ++ ++static int spi_dma_get_pos(struct spi_dma_info *info, unsigned *arg) ++{ ++ if (put_user(info->head, arg)) ++ return -EFAULT; ++ ++ return 0; ++} ++ ++static int spi_dma_wait_pos(struct spi_dma_info *info, unsigned *arg) ++{ ++ DECLARE_WAITQUEUE(wait, current); ++ unsigned pos; ++ int diff; ++ ++ if (get_user(pos, arg)) ++ return -EFAULT; ++ ++ add_wait_queue(&info->wait_q, &wait); ++ while (1) { ++ set_current_state(TASK_INTERRUPTIBLE); ++ if ((diff = info->head - pos) > 0) ++ break; ++ if (signal_pending(current)) ++ break; ++ schedule(); ++ } ++ remove_wait_queue(&info->wait_q, &wait); ++ set_current_state(TASK_RUNNING); ++ ++ if (signal_pending(current)) ++ return -EINTR; ++ ++ if (diff > BUFFER_SIZE) ++ return -ENOBUFS; ++ ++ if (put_user(info->head, arg)) ++ return -EFAULT; ++ ++ return 0; ++} ++ ++#define SPI_DMA_IOCTL_BASE ('N' ^ 'M') ++#define SPI_DMA_GET_BUFFER_SIZE _IOR(SPI_DMA_IOCTL_BASE, 0, unsigned) ++#define SPI_DMA_GET_POS _IOR(SPI_DMA_IOCTL_BASE, 1, unsigned) ++#define SPI_DMA_WAIT_POS _IOWR(SPI_DMA_IOCTL_BASE, 2, unsigned) ++ ++static int spi_dma_ioctl(struct inode *inode, struct file *file, ++ unsigned int cmd, unsigned long arg) ++{ ++ struct spi_dma_state *state = file->private_data; ++ struct spi_dma_info *info = state->info; ++ ++ switch (cmd) { ++ case SPI_DMA_GET_BUFFER_SIZE: ++ if (put_user((unsigned)BUFFER_SIZE, (unsigned *)arg)) ++ return -EFAULT; ++ return 0; ++ ++ case SPI_DMA_GET_POS: ++ return spi_dma_get_pos(info, (unsigned *)arg); ++ ++ case SPI_DMA_WAIT_POS: ++ return spi_dma_wait_pos(info, (unsigned *)arg); ++ ++ default: ++ return -EINVAL; ++ } ++} ++ ++static int spi_dma_open(struct inode *inode, struct file *file) ++{ ++ struct spi_dma_info *info = global_info; ++ struct spi_dma_state *state; ++ int ret; ++ ++ state = kmalloc(sizeof(struct spi_dma_state), GFP_KERNEL); ++ if (!state) ++ return -ENOMEM; ++ state->info = info; ++ state->status = 0; ++ file->private_data = state; ++ ++ ret = nonseekable_open(inode, file); ++ ++ if (ret) ++ kfree(state); ++ ++ return ret; ++} ++ ++static int spi_dma_release(struct inode *inode, struct file *file) ++{ ++ kfree(file->private_data); ++ return 0; ++} ++ ++static struct file_operations spi_dma_fops = { ++ .owner = THIS_MODULE, ++ .read = spi_dma_read, ++ .open = spi_dma_open, ++ .release = spi_dma_release, ++ .mmap = spi_dma_mmap, ++ .ioctl = spi_dma_ioctl, ++}; ++ ++static void spi_dma_free(struct spi_dma_info *info) ++{ ++ if (!info) ++ return; ++ ++ if (info->major) ++ unregister_chrdev(info->major, "s3c2410-spi"); ++ if (info->have_dma) { ++ int value; ++ ++ printk("flush\n"); ++ info->flushing = 1; ++ s3c2410_dma_ctrl(info->dmach, S3C2410_DMAOP_FLUSH); ++ msleep(100); ++ printk("stop\n"); ++ s3c2410_dma_ctrl(info->dmach, S3C2410_DMAOP_STOP); ++ msleep(100); ++ ++ printk("poll\n"); ++ writel(S3C2410_SPCON_SMOD_POLL, info->regs + S3C2410_SPCON); ++ value = readb(info->regs + S3C2410_SPRDAT); ++ printk("%02x\n", value); ++ ++ s3c2410_dma_free(info->dmach, &spi_dma_client); ++ } ++ if (info->regs) ++ iounmap(info->regs); ++ if (info->iomem) { ++ release_resource(info->iomem); ++ kfree(info->iomem); ++ } ++ if (info->clk) { ++ clk_unuse(info->clk); ++ clk_disable(info->clk); ++ } ++ if (info->cpu_addr) { ++ dma_free_coherent(info->dev, ++ info->size, info->cpu_addr, ++ info->handle); ++ ++ } ++ kfree(info); ++} ++ ++static int spi_dma_probe(struct device *dev) ++{ ++ struct platform_device *pdev = to_platform_device(dev); ++ struct spi_dma_info *info; ++ struct resource *res; ++ int ret; ++ int i; ++ ++ printk("spi_dma_probe\n"); ++ ++ info = kmalloc(sizeof(struct spi_dma_info), GFP_KERNEL); ++ if (!info) { ++ dev_err(dev, "failed to allocate info structure\n"); ++ ret = -ENOMEM; ++ goto out; ++ } ++ memset(info, 0, sizeof(*info)); ++ info->dev = dev; ++ ++ dev_info(dev, "got info %p\n", info); ++ ++ // TODO figure this out in a better way ++ info->dmach = 3; ++ info->dcon = S3C2410_DCON_CH3_SPI; ++ info->size = BUFFER_SIZE; ++ ++ spin_lock_init(&info->head_lock); ++ init_waitqueue_head(&info->wait_q); ++ ++ info->cpu_addr = dma_alloc_coherent(dev, info->size, &info->handle, GFP_KERNEL); ++ if (!info->cpu_addr) { ++ dev_err(dev, "failed to allocate DMA buffer\n"); ++ ret = -ENOMEM; ++ goto out; ++ } ++ ++ dev_info(dev, "got DMA buffer at %p, handle 0x%08lx, size %d\n", ++ info->cpu_addr, (long)info->handle, ++ info->size); ++ ++ info->clk = clk_get(dev, "spi"); ++ if (IS_ERR(info->clk)) { ++ dev_err(dev, "clk_get failed\n"); ++ ret = -ENOENT; ++ goto out; ++ } ++ ++ dev_dbg(dev, "clk %p\n", info->clk); ++ ++ clk_use(info->clk); ++ clk_enable(info->clk); ++ ++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ if (!res) { ++ dev_err(dev, "unable to find registers\n"); ++ ret = -ENOENT; ++ goto out; ++ } ++ ++ dev_info(dev, "got iomem %p\n", res); ++ ++ info->iomem = request_mem_region(res->start, ++ (res->end-res->start)+1, ++ pdev->name); ++ if (!info->iomem) { ++ dev_err(dev, "request_mem_region failed\n"); ++ ret = -ENXIO; ++ goto out; ++ } ++ ++ dev_info(dev, "got iomem %p\n", info->iomem); ++ ++ dev_info(dev, "res->start=0x%lx, res->end=0x%lx\n", res->start, res->end); ++ dev_info(dev, "iomem->start=0x%lx, iomem->end=0x%lx\n", info->iomem->start, info->iomem->end); ++ ++ info->regs = ioremap(res->start, (res->end-res->start)+1); ++ if (!info->regs) { ++ dev_err(dev, "ioremap failed\n"); ++ ret = -ENXIO; ++ goto out; ++ } ++ ++ dev_info(dev, "got regs %p\n", info->regs); ++ ++ if (s3c2410_dma_request(info->dmach, &spi_dma_client, NULL)) { ++ dev_err(dev, "unable to allocate dma channel\n"); ++ ret = -ENOENT; ++ goto out; ++ } ++ info->have_dma = 1; ++ ++ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); ++ if (!res) { ++ dev_err(dev, "unable to find irq\n"); ++ ret = -ENOENT; ++ goto out; ++ } ++ ++ ret = register_chrdev(0, "s3c2410-spi", &spi_dma_fops); ++ if (ret < 0) { ++ dev_err(dev, "unable to register character device\n"); ++ goto out; ++ } ++ info->major = ret; ++ global_info = info; ++ ++ dev_info(dev, "SPI driver active\n"); ++ ++ dev_set_drvdata(dev, info); ++ ++ writel(S3C2410_SPCON_SMOD_DMA | S3C2410_SPCON_TAGD, ++ info->regs + S3C2410_SPCON); ++ writel(S3C2410_SPPIN_RESERVED, info->regs + S3C2410_SPPIN); ++ ++ // s3c2410_gpio_cfgpin(S3C2410_GPG5, S3C2410_GPG5_SPIMISO1); ++ s3c2410_gpio_cfgpin(S3C2410_GPG6, S3C2410_GPG6_SPIMOSI1); ++ s3c2410_gpio_cfgpin(S3C2410_GPG7, S3C2410_GPG7_SPICLK1); ++ ++ s3c2410_gpio_cfgpin(S3C2410_GPG3, 0x3 << 6); ++ ++ s3c2410_dma_devconfig(info->dmach, S3C2410_DMASRC_HW, ++ S3C2410_DISRCC_INC | S3C2410_DISRCC_APB, ++ info->iomem->start + S3C2410_SPRDAT); ++ ++ s3c2410_dma_config(info->dmach, 1, info->dcon); ++ ++ s3c2410_dma_set_buffdone_fn(info->dmach, spi_dma_done_callback); ++ s3c2410_dma_setflags(info->dmach, S3C2410_DMAF_AUTOSTART); ++ ++ writeb(0, info->regs + S3C2410_SPTDAT); ++ msleep(10); ++ ++ for (i = 0; i < NUM_CHUNKS; i++) { ++ int offset = i * CHUNK_SIZE; ++ info->chunks[i].index = i; ++ info->chunks[i].handle = info->handle + offset; ++ info->chunks[i].info = info; ++ } ++ ++ for (i = 0; i < NUM_CHUNKS; i++) { ++ spi_queue_dma(&info->chunks[i]); ++ } ++ ++ ret = 0; ++ ++ out: ++ if (ret) ++ spi_dma_free(info); ++ ++ return ret; ++} ++ ++static int spi_dma_remove(struct device *dev) ++{ ++ struct spi_dma_info *info = dev_get_drvdata(dev); ++ ++ dev_set_drvdata(dev, NULL); ++ ++ spi_dma_free(info); ++ ++ return 0; ++} ++ ++static struct device_driver spi_dma_driver = { ++ .name = "s3c2410-spi", ++ .bus = &platform_bus_type, ++ .probe = spi_dma_probe, ++ .remove = spi_dma_remove, ++}; ++ ++static int __init spi_dma_init(void) ++{ ++ printk("SPI dma driver loaded\n"); ++ ++ return driver_register(&spi_dma_driver); ++} ++ ++static void __exit spi_dma_exit(void) ++{ ++ driver_unregister(&spi_dma_driver); ++} ++ ++module_init(spi_dma_init); ++module_exit(spi_dma_exit); ++ ++MODULE_DESCRIPTION("S3C2410 DMA driven SPI driver"); ++MODULE_AUTHOR("Christer Weinigel <christer@weinigel.se>"); ++MODULE_LICENSE("GPL"); |