fbdev: defio and Metronomefb
Implement support for the E-Ink Metronome controller. It provides an mmapable
interface to the controller using defio support. It was tested with a gumstix
pxa255 with Vizplex media using Xfbdev and various X clients such as xeyes,
xpdf, xloadimage.
This patch also fixes the following bug: Defio would cause a hang on write
access to the framebuffer as the page fault would be called ad-infinitum. It
fixes fb_defio by setting the mapping to be used by page_mkclean.
Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/fb/cmap_xfbdev.txt b/Documentation/fb/cmap_xfbdev.txt
new file mode 100644
index 0000000..55e1f0a
--- /dev/null
+++ b/Documentation/fb/cmap_xfbdev.txt
@@ -0,0 +1,53 @@
+Understanding fbdev's cmap
+--------------------------
+
+These notes explain how X's dix layer uses fbdev's cmap structures.
+
+*. example of relevant structures in fbdev as used for a 3-bit grayscale cmap
+struct fb_var_screeninfo {
+ .bits_per_pixel = 8,
+ .grayscale = 1,
+ .red = { 4, 3, 0 },
+ .green = { 0, 0, 0 },
+ .blue = { 0, 0, 0 },
+}
+struct fb_fix_screeninfo {
+ .visual = FB_VISUAL_STATIC_PSEUDOCOLOR,
+}
+for (i = 0; i < 8; i++)
+ info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/16;
+memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*8);
+memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*8);
+
+*. X11 apps do something like the following when trying to use grayscale.
+for (i=0; i < 8; i++) {
+ char colorspec[64];
+ memset(colorspec,0,64);
+ sprintf(colorspec, "rgb:%x/%x/%x", i*36,i*36,i*36);
+ if (!XParseColor(outputDisplay, testColormap, colorspec, &wantedColor))
+ printf("Can't get color %s\n",colorspec);
+ XAllocColor(outputDisplay, testColormap, &wantedColor);
+ grays[i] = wantedColor;
+}
+There's also named equivalents like gray1..x provided you have an rgb.txt.
+
+Somewhere in X's callchain, this results in a call to X code that handles the
+colormap. For example, Xfbdev hits the following:
+
+xc-011010/programs/Xserver/dix/colormap.c:
+
+FindBestPixel(pentFirst, size, prgb, channel)
+
+dr = (long) pent->co.local.red - prgb->red;
+dg = (long) pent->co.local.green - prgb->green;
+db = (long) pent->co.local.blue - prgb->blue;
+sq = dr * dr;
+UnsignedToBigNum (sq, &sum);
+BigNumAdd (&sum, &temp, &sum);
+
+co.local.red are entries that were brought in through FBIOGETCMAP which come
+directly from the info->cmap.red that was listed above. The prgb is the rgb
+that the app wants to match to. The above code is doing what looks like a least
+squares matching function. That's why the cmap entries can't be set to the left
+hand side boundaries of a color range.
+
diff --git a/Documentation/fb/metronomefb.txt b/Documentation/fb/metronomefb.txt
new file mode 100644
index 0000000..b9a2e7b
--- /dev/null
+++ b/Documentation/fb/metronomefb.txt
@@ -0,0 +1,38 @@
+ Metronomefb
+ -----------
+Maintained by Jaya Kumar <jayakumar.lkml.gmail.com>
+Last revised: Nov 20, 2007
+
+Metronomefb is a driver for the Metronome display controller. The controller
+is from E-Ink Corporation. It is intended to be used to drive the E-Ink
+Vizplex display media. E-Ink hosts some details of this controller and the
+display media here http://www.e-ink.com/products/matrix/metronome.html .
+
+Metronome is interfaced to the host CPU through the AMLCD interface. The
+host CPU generates the control information and the image in a framebuffer
+which is then delivered to the AMLCD interface by a host specific method.
+Currently, that's implemented for the PXA's LCDC controller. The display and
+error status are each pulled through individual GPIOs.
+
+Metronomefb was written for the PXA255/gumstix/lyre combination and
+therefore currently has board set specific code in it. If other boards based on
+other architectures are available, then the host specific code can be separated
+and abstracted out.
+
+Metronomefb requires waveform information which is delivered via the AMLCD
+interface to the metronome controller. The waveform information is expected to
+be delivered from userspace via the firmware class interface. The waveform file
+can be compressed as long as your udev or hotplug script is aware of the need
+to uncompress it before delivering it. metronomefb will ask for waveform.wbf
+which would typically go into /lib/firmware/waveform.wbf depending on your
+udev/hotplug setup. I have only tested with a single waveform file which was
+originally labeled 23P01201_60_WT0107_MTC. I do not know what it stands for.
+Caution should be exercised when manipulating the waveform as there may be
+a possibility that it could have some permanent effects on the display media.
+I neither have access to nor know exactly what the waveform does in terms of
+the physical media.
+
+Metronomefb uses the deferred IO interface so that it can provide a memory
+mappable frame buffer. It has been tested with tinyx (Xfbdev). It is known
+to work at this time with xeyes, xclock, xloadimage, xpdf.
+
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index e0b0580..1bd5fb3 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1893,6 +1893,20 @@
framebuffer. ML300 carries a 640*480 LCD display on the board,
ML403 uses a standard DB15 VGA connector.
+config FB_METRONOME
+ tristate "Metronome display controller support"
+ depends on FB && ARCH_PXA && MMU
+ select FB_SYS_FILLRECT
+ select FB_SYS_COPYAREA
+ select FB_SYS_IMAGEBLIT
+ select FB_SYS_FOPS
+ select FB_DEFERRED_IO
+ help
+ This enables support for the Metronome display controller. Tested
+ with an E-Ink 800x600 display and Gumstix Connex through an AMLCD
+ interface. Please read <file:Documentation/fb/metronomefb.txt>
+ for more information.
+
config FB_VIRTUAL
tristate "Virtual Frame Buffer support (ONLY FOR TESTING!)"
depends on FB
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 03371c7..11c0e5e 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -103,6 +103,7 @@
obj-$(CONFIG_FB_PMAG_BA) += pmag-ba-fb.o
obj-$(CONFIG_FB_PMAGB_B) += pmagb-b-fb.o
obj-$(CONFIG_FB_MAXINE) += maxinefb.o
+obj-$(CONFIG_FB_METRONOME) += metronomefb.o
obj-$(CONFIG_FB_S1D13XXX) += s1d13xxxfb.o
obj-$(CONFIG_FB_IMX) += imxfb.o
obj-$(CONFIG_FB_S3C2410) += s3c2410fb.o
diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c
index 0f8cfb9..24843fd 100644
--- a/drivers/video/fb_defio.c
+++ b/drivers/video/fb_defio.c
@@ -4,7 +4,7 @@
* Copyright (C) 2006 Jaya Kumar
*
* This file is subject to the terms and conditions of the GNU General Public
- * License. See the file COPYING in the main directory of this archive
+ * License. See the file COPYING in the main directory of this archive
* for more details.
*/
@@ -31,7 +31,7 @@
unsigned long offset;
struct page *page;
struct fb_info *info = vma->vm_private_data;
- /* info->screen_base is in System RAM */
+ /* info->screen_base is virtual memory */
void *screen_base = (void __force *) info->screen_base;
offset = vmf->pgoff << PAGE_SHIFT;
@@ -43,6 +43,15 @@
return VM_FAULT_SIGBUS;
get_page(page);
+
+ if (vma->vm_file)
+ page->mapping = vma->vm_file->f_mapping;
+ else
+ printk(KERN_ERR "no mapping available\n");
+
+ BUG_ON(!page->mapping);
+ page->index = vmf->pgoff;
+
vmf->page = page;
return 0;
}
@@ -138,11 +147,20 @@
void fb_deferred_io_cleanup(struct fb_info *info)
{
+ void *screen_base = (void __force *) info->screen_base;
struct fb_deferred_io *fbdefio = info->fbdefio;
+ struct page *page;
+ int i;
BUG_ON(!fbdefio);
cancel_delayed_work(&info->deferred_work);
flush_scheduled_work();
+
+ /* clear out the mapping that we setup */
+ for (i = 0 ; i < info->fix.smem_len; i += PAGE_SIZE) {
+ page = vmalloc_to_page(screen_base + i);
+ page->mapping = NULL;
+ }
}
EXPORT_SYMBOL_GPL(fb_deferred_io_cleanup);
diff --git a/drivers/video/metronomefb.c b/drivers/video/metronomefb.c
new file mode 100644
index 0000000..e9a89fd
--- /dev/null
+++ b/drivers/video/metronomefb.c
@@ -0,0 +1,999 @@
+/*
+ * linux/drivers/video/metronomefb.c -- FB driver for Metronome controller
+ *
+ * Copyright (C) 2008, Jaya Kumar
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
+ *
+ * This work was made possible by help and equipment support from E-Ink
+ * Corporation. http://support.eink.com/community
+ *
+ * This driver is written to be used with the Metronome display controller.
+ * It was tested with an E-Ink 800x600 Vizplex EPD on a Gumstix Connex board
+ * using the Lyre interface board.
+ *
+ * General notes:
+ * - User must set metronomefb_enable=1 to enable it.
+ * - See Documentation/fb/metronomefb.txt for how metronome works.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/list.h>
+#include <linux/firmware.h>
+#include <linux/dma-mapping.h>
+#include <linux/uaccess.h>
+#include <linux/irq.h>
+
+#include <asm/arch/pxa-regs.h>
+#include <asm/unaligned.h>
+
+#define DEBUG 1
+#ifdef DEBUG
+#define DPRINTK(f, a...) printk(KERN_DEBUG "%s: " f, __func__ , ## a)
+#else
+#define DPRINTK(f, a...)
+#endif
+
+
+/* Display specific information */
+#define DPY_W 832
+#define DPY_H 622
+
+struct metromem_desc {
+ u32 mFDADR0;
+ u32 mFSADR0;
+ u32 mFIDR0;
+ u32 mLDCMD0;
+};
+
+struct metromem_cmd {
+ u16 opcode;
+ u16 args[((64-2)/2)];
+ u16 csum;
+};
+
+struct metronomefb_par {
+ unsigned char *metromem;
+ struct metromem_desc *metromem_desc;
+ struct metromem_cmd *metromem_cmd;
+ unsigned char *metromem_wfm;
+ unsigned char *metromem_img;
+ u16 *metromem_img_csum;
+ u16 *csum_table;
+ int metromemsize;
+ dma_addr_t metromem_dma;
+ dma_addr_t metromem_desc_dma;
+ struct fb_info *info;
+ wait_queue_head_t waitq;
+ u8 frame_count;
+};
+
+/* frame differs from image. frame includes non-visible pixels */
+struct epd_frame {
+ int fw; /* frame width */
+ int fh; /* frame height */
+};
+
+static struct epd_frame epd_frame_table[] = {
+ {
+ .fw = 832,
+ .fh = 622
+ },
+};
+
+static struct fb_fix_screeninfo metronomefb_fix __devinitdata = {
+ .id = "metronomefb",
+ .type = FB_TYPE_PACKED_PIXELS,
+ .visual = FB_VISUAL_STATIC_PSEUDOCOLOR,
+ .xpanstep = 0,
+ .ypanstep = 0,
+ .ywrapstep = 0,
+ .line_length = DPY_W,
+ .accel = FB_ACCEL_NONE,
+};
+
+static struct fb_var_screeninfo metronomefb_var __devinitdata = {
+ .xres = DPY_W,
+ .yres = DPY_H,
+ .xres_virtual = DPY_W,
+ .yres_virtual = DPY_H,
+ .bits_per_pixel = 8,
+ .grayscale = 1,
+ .nonstd = 1,
+ .red = { 4, 3, 0 },
+ .green = { 0, 0, 0 },
+ .blue = { 0, 0, 0 },
+ .transp = { 0, 0, 0 },
+};
+
+static unsigned int metronomefb_enable;
+
+struct waveform_hdr {
+ u8 stuff[32];
+
+ u8 wmta[3];
+ u8 fvsn;
+
+ u8 luts;
+ u8 mc;
+ u8 trc;
+ u8 stuff3;
+
+ u8 endb;
+ u8 swtb;
+ u8 stuff2a[2];
+
+ u8 stuff2b[3];
+ u8 wfm_cs;
+} __attribute__ ((packed));
+
+/* main metronomefb functions */
+static u8 calc_cksum(int start, int end, u8 *mem)
+{
+ u8 tmp = 0;
+ int i;
+
+ for (i = start; i < end; i++)
+ tmp += mem[i];
+
+ return tmp;
+}
+
+static u16 calc_img_cksum(u16 *start, int length)
+{
+ u16 tmp = 0;
+
+ while (length--)
+ tmp += *start++;
+
+ return tmp;
+}
+
+/* here we decode the incoming waveform file and populate metromem */
+#define EXP_WFORM_SIZE 47001
+static int load_waveform(u8 *mem, size_t size, u8 *metromem, int m, int t,
+ u8 *frame_count)
+{
+ int tta;
+ int wmta;
+ int trn = 0;
+ int i;
+ unsigned char v;
+ u8 cksum;
+ int cksum_idx;
+ int wfm_idx, owfm_idx;
+ int mem_idx = 0;
+ struct waveform_hdr *wfm_hdr;
+
+ if (size != EXP_WFORM_SIZE) {
+ printk(KERN_ERR "Error: unexpected size %d != %d\n", size,
+ EXP_WFORM_SIZE);
+ return -EINVAL;
+ }
+
+ wfm_hdr = (struct waveform_hdr *) mem;
+
+ if (wfm_hdr->fvsn != 1) {
+ printk(KERN_ERR "Error: bad fvsn %x\n", wfm_hdr->fvsn);
+ return -EINVAL;
+ }
+ if (wfm_hdr->luts != 0) {
+ printk(KERN_ERR "Error: bad luts %x\n", wfm_hdr->luts);
+ return -EINVAL;
+ }
+ cksum = calc_cksum(32, 47, mem);
+ if (cksum != wfm_hdr->wfm_cs) {
+ printk(KERN_ERR "Error: bad cksum %x != %x\n", cksum,
+ wfm_hdr->wfm_cs);
+ return -EINVAL;
+ }
+ wfm_hdr->mc += 1;
+ wfm_hdr->trc += 1;
+ for (i = 0; i < 5; i++) {
+ if (*(wfm_hdr->stuff2a + i) != 0) {
+ printk(KERN_ERR "Error: unexpected value in padding\n");
+ return -EINVAL;
+ }
+ }
+
+ /* calculating trn. trn is something used to index into
+ the waveform. presumably selecting the right one for the
+ desired temperature. it works out the offset of the first
+ v that exceeds the specified temperature */
+ if ((sizeof(*wfm_hdr) + wfm_hdr->trc) > size)
+ return -EINVAL;
+
+ for (i = sizeof(*wfm_hdr); i <= sizeof(*wfm_hdr) + wfm_hdr->trc; i++) {
+ if (mem[i] > t) {
+ trn = i - sizeof(*wfm_hdr) - 1;
+ break;
+ }
+ }
+
+ /* check temperature range table checksum */
+ cksum_idx = sizeof(*wfm_hdr) + wfm_hdr->trc + 1;
+ if (cksum_idx > size)
+ return -EINVAL;
+ cksum = calc_cksum(sizeof(*wfm_hdr), cksum_idx, mem);
+ if (cksum != mem[cksum_idx]) {
+ printk(KERN_ERR "Error: bad temperature range table cksum"
+ " %x != %x\n", cksum, mem[cksum_idx]);
+ return -EINVAL;
+ }
+
+ /* check waveform mode table address checksum */
+ wmta = le32_to_cpu(get_unaligned((__le32 *) wfm_hdr->wmta));
+ wmta &= 0x00FFFFFF;
+ cksum_idx = wmta + m*4 + 3;
+ if (cksum_idx > size)
+ return -EINVAL;
+ cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem);
+ if (cksum != mem[cksum_idx]) {
+ printk(KERN_ERR "Error: bad mode table address cksum"
+ " %x != %x\n", cksum, mem[cksum_idx]);
+ return -EINVAL;
+ }
+
+ /* check waveform temperature table address checksum */
+ tta = le32_to_cpu(get_unaligned((int *) (mem + wmta + m*4)));
+ tta &= 0x00FFFFFF;
+ cksum_idx = tta + trn*4 + 3;
+ if (cksum_idx > size)
+ return -EINVAL;
+ cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem);
+ if (cksum != mem[cksum_idx]) {
+ printk(KERN_ERR "Error: bad temperature table address cksum"
+ " %x != %x\n", cksum, mem[cksum_idx]);
+ return -EINVAL;
+ }
+
+ /* here we do the real work of putting the waveform into the
+ metromem buffer. this does runlength decoding of the waveform */
+ wfm_idx = le32_to_cpu(get_unaligned((__le32 *) (mem + tta + trn*4)));
+ wfm_idx &= 0x00FFFFFF;
+ owfm_idx = wfm_idx;
+ if (wfm_idx > size)
+ return -EINVAL;
+ while (wfm_idx < size) {
+ unsigned char rl;
+ v = mem[wfm_idx++];
+ if (v == wfm_hdr->swtb) {
+ while (((v = mem[wfm_idx++]) != wfm_hdr->swtb) &&
+ wfm_idx < size)
+ metromem[mem_idx++] = v;
+
+ continue;
+ }
+
+ if (v == wfm_hdr->endb)
+ break;
+
+ rl = mem[wfm_idx++];
+ for (i = 0; i <= rl; i++)
+ metromem[mem_idx++] = v;
+ }
+
+ cksum_idx = wfm_idx;
+ if (cksum_idx > size)
+ return -EINVAL;
+ cksum = calc_cksum(owfm_idx, cksum_idx, mem);
+ if (cksum != mem[cksum_idx]) {
+ printk(KERN_ERR "Error: bad waveform data cksum"
+ " %x != %x\n", cksum, mem[cksum_idx]);
+ return -EINVAL;
+ }
+ *frame_count = (mem_idx/64);
+
+ return 0;
+}
+
+/* register offsets for gpio control */
+#define LED_GPIO_PIN 51
+#define STDBY_GPIO_PIN 48
+#define RST_GPIO_PIN 49
+#define RDY_GPIO_PIN 32
+#define ERR_GPIO_PIN 17
+#define PCBPWR_GPIO_PIN 16
+
+#define AF_SEL_GPIO_N 0x3
+#define GAFR0_U_OFFSET(pin) ((pin - 16) * 2)
+#define GAFR1_L_OFFSET(pin) ((pin - 32) * 2)
+#define GAFR1_U_OFFSET(pin) ((pin - 48) * 2)
+#define GPDR1_OFFSET(pin) (pin - 32)
+#define GPCR1_OFFSET(pin) (pin - 32)
+#define GPSR1_OFFSET(pin) (pin - 32)
+#define GPCR0_OFFSET(pin) (pin)
+#define GPSR0_OFFSET(pin) (pin)
+
+static void metronome_set_gpio_output(int pin, int val)
+{
+ u8 index;
+
+ index = pin >> 4;
+
+ switch (index) {
+ case 1:
+ if (val)
+ GPSR0 |= (1 << GPSR0_OFFSET(pin));
+ else
+ GPCR0 |= (1 << GPCR0_OFFSET(pin));
+ break;
+ case 2:
+ break;
+ case 3:
+ if (val)
+ GPSR1 |= (1 << GPSR1_OFFSET(pin));
+ else
+ GPCR1 |= (1 << GPCR1_OFFSET(pin));
+ break;
+ default:
+ printk(KERN_ERR "unimplemented\n");
+ }
+}
+
+static void __devinit metronome_init_gpio_pin(int pin, int dir)
+{
+ u8 index;
+ /* dir 0 is output, 1 is input
+ - do 2 things here:
+ - set gpio alternate function to standard gpio
+ - set gpio direction to input or output */
+
+ index = pin >> 4;
+ switch (index) {
+ case 1:
+ GAFR0_U &= ~(AF_SEL_GPIO_N << GAFR0_U_OFFSET(pin));
+
+ if (dir)
+ GPDR0 &= ~(1 << pin);
+ else
+ GPDR0 |= (1 << pin);
+ break;
+ case 2:
+ GAFR1_L &= ~(AF_SEL_GPIO_N << GAFR1_L_OFFSET(pin));
+
+ if (dir)
+ GPDR1 &= ~(1 << GPDR1_OFFSET(pin));
+ else
+ GPDR1 |= (1 << GPDR1_OFFSET(pin));
+ break;
+ case 3:
+ GAFR1_U &= ~(AF_SEL_GPIO_N << GAFR1_U_OFFSET(pin));
+
+ if (dir)
+ GPDR1 &= ~(1 << GPDR1_OFFSET(pin));
+ else
+ GPDR1 |= (1 << GPDR1_OFFSET(pin));
+ break;
+ default:
+ printk(KERN_ERR "unimplemented\n");
+ }
+}
+
+static void __devinit metronome_init_gpio_regs(void)
+{
+ metronome_init_gpio_pin(LED_GPIO_PIN, 0);
+ metronome_set_gpio_output(LED_GPIO_PIN, 0);
+
+ metronome_init_gpio_pin(STDBY_GPIO_PIN, 0);
+ metronome_set_gpio_output(STDBY_GPIO_PIN, 0);
+
+ metronome_init_gpio_pin(RST_GPIO_PIN, 0);
+ metronome_set_gpio_output(RST_GPIO_PIN, 0);
+
+ metronome_init_gpio_pin(RDY_GPIO_PIN, 1);
+
+ metronome_init_gpio_pin(ERR_GPIO_PIN, 1);
+
+ metronome_init_gpio_pin(PCBPWR_GPIO_PIN, 0);
+ metronome_set_gpio_output(PCBPWR_GPIO_PIN, 0);
+}
+
+static void metronome_disable_lcd_controller(struct metronomefb_par *par)
+{
+ LCSR = 0xffffffff; /* Clear LCD Status Register */
+ LCCR0 |= LCCR0_DIS; /* Disable LCD Controller */
+
+ /* we reset and just wait for things to settle */
+ msleep(200);
+}
+
+static void metronome_enable_lcd_controller(struct metronomefb_par *par)
+{
+ LCSR = 0xffffffff;
+ FDADR0 = par->metromem_desc_dma;
+ LCCR0 |= LCCR0_ENB;
+}
+
+static void __devinit metronome_init_lcdc_regs(struct metronomefb_par *par)
+{
+ /* here we do:
+ - disable the lcd controller
+ - setup lcd control registers
+ - setup dma descriptor
+ - reenable lcd controller
+ */
+
+ /* disable the lcd controller */
+ metronome_disable_lcd_controller(par);
+
+ /* setup lcd control registers */
+ LCCR0 = LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM | LCCR0_PAS
+ | LCCR0_QDM | LCCR0_BM | LCCR0_OUM;
+
+ LCCR1 = (epd_frame_table[0].fw/2 - 1) /* pixels per line */
+ | (27 << 10) /* hsync pulse width - 1 */
+ | (33 << 16) /* eol pixel count */
+ | (33 << 24); /* bol pixel count */
+
+ LCCR2 = (epd_frame_table[0].fh - 1) /* lines per panel */
+ | (24 << 10) /* vsync pulse width - 1 */
+ | (2 << 16) /* eof pixel count */
+ | (0 << 24); /* bof pixel count */
+
+ LCCR3 = 2 /* pixel clock divisor */
+ | (24 << 8) /* AC Bias pin freq */
+ | LCCR3_16BPP /* BPP */
+ | LCCR3_PCP; /* PCP falling edge */
+
+ /* setup dma descriptor */
+ par->metromem_desc->mFDADR0 = par->metromem_desc_dma;
+ par->metromem_desc->mFSADR0 = par->metromem_dma;
+ par->metromem_desc->mFIDR0 = 0;
+ par->metromem_desc->mLDCMD0 = epd_frame_table[0].fw
+ * epd_frame_table[0].fh;
+ /* reenable lcd controller */
+ metronome_enable_lcd_controller(par);
+}
+
+static int metronome_display_cmd(struct metronomefb_par *par)
+{
+ int i;
+ u16 cs;
+ u16 opcode;
+ static u8 borderval;
+ u8 *ptr;
+
+ /* setup display command
+ we can't immediately set the opcode since the controller
+ will try parse the command before we've set it all up
+ so we just set cs here and set the opcode at the end */
+
+ ptr = par->metromem;
+
+ if (par->metromem_cmd->opcode == 0xCC40)
+ opcode = cs = 0xCC41;
+ else
+ opcode = cs = 0xCC40;
+
+ /* set the args ( 2 bytes ) for display */
+ i = 0;
+ par->metromem_cmd->args[i] = 1 << 3 /* border update */
+ | ((borderval++ % 4) & 0x0F) << 4
+ | (par->frame_count - 1) << 8;
+ cs += par->metromem_cmd->args[i++];
+
+ /* the rest are 0 */
+ memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);
+
+ par->metromem_cmd->csum = cs;
+ par->metromem_cmd->opcode = opcode; /* display cmd */
+
+ i = wait_event_interruptible_timeout(par->waitq, (GPLR1 & 0x01), HZ);
+ return i;
+}
+
+static int __devinit metronome_powerup_cmd(struct metronomefb_par *par)
+{
+ int i;
+ u16 cs;
+
+ /* setup power up command */
+ par->metromem_cmd->opcode = 0x1234; /* pwr up pseudo cmd */
+ cs = par->metromem_cmd->opcode;
+
+ /* set pwr1,2,3 to 1024 */
+ for (i = 0; i < 3; i++) {
+ par->metromem_cmd->args[i] = 1024;
+ cs += par->metromem_cmd->args[i];
+ }
+
+ /* the rest are 0 */
+ memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);
+
+ par->metromem_cmd->csum = cs;
+
+ msleep(1);
+ metronome_set_gpio_output(RST_GPIO_PIN, 1);
+
+ msleep(1);
+ metronome_set_gpio_output(STDBY_GPIO_PIN, 1);
+
+ i = wait_event_timeout(par->waitq, (GPLR1 & 0x01), HZ);
+ return i;
+}
+
+static int __devinit metronome_config_cmd(struct metronomefb_par *par)
+{
+ int i;
+ u16 cs;
+
+ /* setup config command
+ we can't immediately set the opcode since the controller
+ will try parse the command before we've set it all up
+ so we just set cs here and set the opcode at the end */
+
+ cs = 0xCC10;
+
+ /* set the 12 args ( 8 bytes ) for config. see spec for meanings */
+ i = 0;
+ par->metromem_cmd->args[i] = 15 /* sdlew */
+ | 2 << 8 /* sdosz */
+ | 0 << 11 /* sdor */
+ | 0 << 12 /* sdces */
+ | 0 << 15; /* sdcer */
+ cs += par->metromem_cmd->args[i++];
+
+ par->metromem_cmd->args[i] = 42 /* gdspl */
+ | 1 << 8 /* gdr1 */
+ | 1 << 9 /* sdshr */
+ | 0 << 15; /* gdspp */
+ cs += par->metromem_cmd->args[i++];
+
+ par->metromem_cmd->args[i] = 18 /* gdspw */
+ | 0 << 15; /* dispc */
+ cs += par->metromem_cmd->args[i++];
+
+ par->metromem_cmd->args[i] = 599 /* vdlc */
+ | 0 << 11 /* dsi */
+ | 0 << 12; /* dsic */
+ cs += par->metromem_cmd->args[i++];
+
+ /* the rest are 0 */
+ memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);
+
+ par->metromem_cmd->csum = cs;
+ par->metromem_cmd->opcode = 0xCC10; /* config cmd */
+
+ i = wait_event_timeout(par->waitq, (GPLR1 & 0x01), HZ);
+ return i;
+}
+
+static int __devinit metronome_init_cmd(struct metronomefb_par *par)
+{
+ int i;
+ u16 cs;
+
+ /* setup init command
+ we can't immediately set the opcode since the controller
+ will try parse the command before we've set it all up
+ so we just set cs here and set the opcode at the end */
+
+ cs = 0xCC20;
+
+ /* set the args ( 2 bytes ) for init */
+ i = 0;
+ par->metromem_cmd->args[i] = 0;
+ cs += par->metromem_cmd->args[i++];
+
+ /* the rest are 0 */
+ memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);
+
+ par->metromem_cmd->csum = cs;
+ par->metromem_cmd->opcode = 0xCC20; /* init cmd */
+
+ i = wait_event_timeout(par->waitq, (GPLR1 & 0x01), HZ);
+ return i;
+}
+
+static int __devinit metronome_init_regs(struct metronomefb_par *par)
+{
+ int res;
+
+ metronome_init_gpio_regs();
+ metronome_init_lcdc_regs(par);
+
+ res = metronome_powerup_cmd(par);
+ if (res)
+ return res;
+
+ res = metronome_config_cmd(par);
+ if (res)
+ return res;
+
+ res = metronome_init_cmd(par);
+ if (res)
+ return res;
+
+ return res;
+}
+
+static void metronomefb_dpy_update(struct metronomefb_par *par)
+{
+ u16 cksum;
+ unsigned char *buf = (unsigned char __force *)par->info->screen_base;
+
+ /* copy from vm to metromem */
+ memcpy(par->metromem_img, buf, DPY_W*DPY_H);
+
+ cksum = calc_img_cksum((u16 *) par->metromem_img,
+ (epd_frame_table[0].fw * DPY_H)/2);
+ *((u16 *) (par->metromem_img) +
+ (epd_frame_table[0].fw * DPY_H)/2) = cksum;
+ metronome_display_cmd(par);
+}
+
+static u16 metronomefb_dpy_update_page(struct metronomefb_par *par, int index)
+{
+ int i;
+ u16 csum = 0;
+ u16 *buf = (u16 __force *) (par->info->screen_base + index);
+ u16 *img = (u16 *) (par->metromem_img + index);
+
+ /* swizzle from vm to metromem and recalc cksum at the same time*/
+ for (i = 0; i < PAGE_SIZE/2; i++) {
+ *(img + i) = (buf[i] << 5) & 0xE0E0;
+ csum += *(img + i);
+ }
+ return csum;
+}
+
+/* this is called back from the deferred io workqueue */
+static void metronomefb_dpy_deferred_io(struct fb_info *info,
+ struct list_head *pagelist)
+{
+ u16 cksum;
+ struct page *cur;
+ struct fb_deferred_io *fbdefio = info->fbdefio;
+ struct metronomefb_par *par = info->par;
+
+ /* walk the written page list and swizzle the data */
+ list_for_each_entry(cur, &fbdefio->pagelist, lru) {
+ cksum = metronomefb_dpy_update_page(par,
+ (cur->index << PAGE_SHIFT));
+ par->metromem_img_csum -= par->csum_table[cur->index];
+ par->csum_table[cur->index] = cksum;
+ par->metromem_img_csum += cksum;
+ }
+
+ metronome_display_cmd(par);
+}
+
+static void metronomefb_fillrect(struct fb_info *info,
+ const struct fb_fillrect *rect)
+{
+ struct metronomefb_par *par = info->par;
+
+ cfb_fillrect(info, rect);
+ metronomefb_dpy_update(par);
+}
+
+static void metronomefb_copyarea(struct fb_info *info,
+ const struct fb_copyarea *area)
+{
+ struct metronomefb_par *par = info->par;
+
+ cfb_copyarea(info, area);
+ metronomefb_dpy_update(par);
+}
+
+static void metronomefb_imageblit(struct fb_info *info,
+ const struct fb_image *image)
+{
+ struct metronomefb_par *par = info->par;
+
+ cfb_imageblit(info, image);
+ metronomefb_dpy_update(par);
+}
+
+/*
+ * this is the slow path from userspace. they can seek and write to
+ * the fb. it is based on fb_sys_write
+ */
+static ssize_t metronomefb_write(struct fb_info *info, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct metronomefb_par *par = info->par;
+ unsigned long p = *ppos;
+ void *dst;
+ int err = 0;
+ unsigned long total_size;
+
+ if (info->state != FBINFO_STATE_RUNNING)
+ return -EPERM;
+
+ total_size = info->fix.smem_len;
+
+ if (p > total_size)
+ return -EFBIG;
+
+ if (count > total_size) {
+ err = -EFBIG;
+ count = total_size;
+ }
+
+ if (count + p > total_size) {
+ if (!err)
+ err = -ENOSPC;
+
+ count = total_size - p;
+ }
+
+ dst = (void __force *) (info->screen_base + p);
+
+ if (copy_from_user(dst, buf, count))
+ err = -EFAULT;
+
+ if (!err)
+ *ppos += count;
+
+ metronomefb_dpy_update(par);
+
+ return (err) ? err : count;
+}
+
+static struct fb_ops metronomefb_ops = {
+ .owner = THIS_MODULE,
+ .fb_write = metronomefb_write,
+ .fb_fillrect = metronomefb_fillrect,
+ .fb_copyarea = metronomefb_copyarea,
+ .fb_imageblit = metronomefb_imageblit,
+};
+
+static struct fb_deferred_io metronomefb_defio = {
+ .delay = HZ,
+ .deferred_io = metronomefb_dpy_deferred_io,
+};
+
+static irqreturn_t metronome_handle_irq(int irq, void *dev_id)
+{
+ struct fb_info *info = dev_id;
+ struct metronomefb_par *par = info->par;
+
+ wake_up_interruptible(&par->waitq);
+ return IRQ_HANDLED;
+}
+
+static int __devinit metronomefb_probe(struct platform_device *dev)
+{
+ struct fb_info *info;
+ int retval = -ENOMEM;
+ int videomemorysize;
+ unsigned char *videomemory;
+ struct metronomefb_par *par;
+ const struct firmware *fw_entry;
+ int cmd_size, wfm_size, img_size, padding_size, totalsize;
+ int i;
+
+ /* we have two blocks of memory.
+ info->screen_base which is vm, and is the fb used by apps.
+ par->metromem which is physically contiguous memory and
+ contains the display controller commands, waveform,
+ processed image data and padding. this is the data pulled
+ by the pxa255's LCD controller and pushed to Metronome */
+
+ videomemorysize = (DPY_W*DPY_H);
+ videomemory = vmalloc(videomemorysize);
+ if (!videomemory)
+ return retval;
+
+ memset(videomemory, 0, videomemorysize);
+
+ info = framebuffer_alloc(sizeof(struct metronomefb_par), &dev->dev);
+ if (!info)
+ goto err_vfree;
+
+ info->screen_base = (char __iomem *) videomemory;
+ info->fbops = &metronomefb_ops;
+
+ info->var = metronomefb_var;
+ info->fix = metronomefb_fix;
+ info->fix.smem_len = videomemorysize;
+ par = info->par;
+ par->info = info;
+ init_waitqueue_head(&par->waitq);
+
+ /* this table caches per page csum values. */
+ par->csum_table = vmalloc(videomemorysize/PAGE_SIZE);
+ if (!par->csum_table)
+ goto err_csum_table;
+
+ /* the metromem buffer is divided as follows:
+ command | CRC | padding
+ 16kb waveform data | CRC | padding
+ image data | CRC
+ and an extra 256 bytes for dma descriptors
+ eg: IW=832 IH=622 WS=128
+ */
+
+ cmd_size = 1 * epd_frame_table[0].fw;
+ wfm_size = ((16*1024 + 2 + epd_frame_table[0].fw - 1)
+ / epd_frame_table[0].fw) * epd_frame_table[0].fw;
+ img_size = epd_frame_table[0].fh * epd_frame_table[0].fw;
+ padding_size = 4 * epd_frame_table[0].fw;
+ totalsize = cmd_size + wfm_size + img_size + padding_size;
+ par->metromemsize = PAGE_ALIGN(totalsize + 256);
+ DPRINTK("desired memory size = %d\n", par->metromemsize);
+ dev->dev.coherent_dma_mask = 0xffffffffull;
+ par->metromem = dma_alloc_writecombine(&dev->dev, par->metromemsize,
+ &par->metromem_dma, GFP_KERNEL);
+ if (!par->metromem) {
+ printk(KERN_ERR
+ "metronomefb: unable to allocate dma buffer\n");
+ goto err_vfree;
+ }
+
+ info->fix.smem_start = par->metromem_dma;
+ par->metromem_cmd = (struct metromem_cmd *) par->metromem;
+ par->metromem_wfm = par->metromem + cmd_size;
+ par->metromem_img = par->metromem + cmd_size + wfm_size;
+ par->metromem_img_csum = (u16 *) (par->metromem_img +
+ (epd_frame_table[0].fw * DPY_H));
+ DPRINTK("img offset=0x%x\n", cmd_size + wfm_size);
+ par->metromem_desc = (struct metromem_desc *) (par->metromem + cmd_size
+ + wfm_size + img_size + padding_size);
+ par->metromem_desc_dma = par->metromem_dma + cmd_size + wfm_size
+ + img_size + padding_size;
+
+ /* load the waveform in. assume mode 3, temp 31 for now */
+ /* a) request the waveform file from userspace
+ b) process waveform and decode into metromem */
+
+ retval = request_firmware(&fw_entry, "waveform.wbf", &dev->dev);
+ if (retval < 0) {
+ printk(KERN_ERR "metronomefb: couldn't get waveform\n");
+ goto err_dma_free;
+ }
+
+ retval = load_waveform((u8 *) fw_entry->data, fw_entry->size,
+ par->metromem_wfm, 3, 31, &par->frame_count);
+ if (retval < 0) {
+ printk(KERN_ERR "metronomefb: couldn't process waveform\n");
+ goto err_ld_wfm;
+ }
+ release_firmware(fw_entry);
+
+ retval = request_irq(IRQ_GPIO(RDY_GPIO_PIN), metronome_handle_irq,
+ IRQF_DISABLED, "Metronome", info);
+ if (retval) {
+ dev_err(&dev->dev, "request_irq failed: %d\n", retval);
+ goto err_ld_wfm;
+ }
+ set_irq_type(IRQ_GPIO(RDY_GPIO_PIN), IRQT_FALLING);
+
+ retval = metronome_init_regs(par);
+ if (retval < 0)
+ goto err_free_irq;
+
+ info->flags = FBINFO_FLAG_DEFAULT;
+
+ info->fbdefio = &metronomefb_defio;
+ fb_deferred_io_init(info);
+
+ retval = fb_alloc_cmap(&info->cmap, 8, 0);
+ if (retval < 0) {
+ printk(KERN_ERR "Failed to allocate colormap\n");
+ goto err_fb_rel;
+ }
+
+ /* set cmap */
+ for (i = 0; i < 8; i++)
+ info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/16;
+ memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*8);
+ memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*8);
+
+ retval = register_framebuffer(info);
+ if (retval < 0)
+ goto err_cmap;
+
+ platform_set_drvdata(dev, info);
+
+ printk(KERN_INFO
+ "fb%d: Metronome frame buffer device, using %dK of video"
+ " memory\n", info->node, videomemorysize >> 10);
+
+ return 0;
+
+err_cmap:
+ fb_dealloc_cmap(&info->cmap);
+err_fb_rel:
+ framebuffer_release(info);
+err_free_irq:
+ free_irq(IRQ_GPIO(RDY_GPIO_PIN), info);
+err_ld_wfm:
+ release_firmware(fw_entry);
+err_dma_free:
+ dma_free_writecombine(&dev->dev, par->metromemsize, par->metromem,
+ par->metromem_dma);
+err_csum_table:
+ vfree(par->csum_table);
+err_vfree:
+ vfree(videomemory);
+ return retval;
+}
+
+static int __devexit metronomefb_remove(struct platform_device *dev)
+{
+ struct fb_info *info = platform_get_drvdata(dev);
+
+ if (info) {
+ struct metronomefb_par *par = info->par;
+ fb_deferred_io_cleanup(info);
+ dma_free_writecombine(&dev->dev, par->metromemsize,
+ par->metromem, par->metromem_dma);
+ fb_dealloc_cmap(&info->cmap);
+ vfree(par->csum_table);
+ unregister_framebuffer(info);
+ vfree((void __force *)info->screen_base);
+ free_irq(IRQ_GPIO(RDY_GPIO_PIN), info);
+ framebuffer_release(info);
+ }
+ return 0;
+}
+
+static struct platform_driver metronomefb_driver = {
+ .probe = metronomefb_probe,
+ .remove = metronomefb_remove,
+ .driver = {
+ .name = "metronomefb",
+ },
+};
+
+static struct platform_device *metronomefb_device;
+
+static int __init metronomefb_init(void)
+{
+ int ret;
+
+ if (!metronomefb_enable) {
+ printk(KERN_ERR
+ "Use metronomefb_enable to enable the device\n");
+ return -ENXIO;
+ }
+
+ ret = platform_driver_register(&metronomefb_driver);
+ if (!ret) {
+ metronomefb_device = platform_device_alloc("metronomefb", 0);
+ if (metronomefb_device)
+ ret = platform_device_add(metronomefb_device);
+ else
+ ret = -ENOMEM;
+
+ if (ret) {
+ platform_device_put(metronomefb_device);
+ platform_driver_unregister(&metronomefb_driver);
+ }
+ }
+ return ret;
+
+}
+
+static void __exit metronomefb_exit(void)
+{
+ platform_device_unregister(metronomefb_device);
+ platform_driver_unregister(&metronomefb_driver);
+}
+
+module_param(metronomefb_enable, uint, 0);
+MODULE_PARM_DESC(metronomefb_enable, "Enable communication with Metronome");
+
+module_init(metronomefb_init);
+module_exit(metronomefb_exit);
+
+MODULE_DESCRIPTION("fbdev driver for Metronome controller");
+MODULE_AUTHOR("Jaya Kumar");
+MODULE_LICENSE("GPL");