[RFC][PATCH 16/26] fbdev: Add JZ4740 framebuffer driver

Lars-Peter Clausen
2010-06-02T19:11:37Z

This patch adds support for the LCD controller on JZ4740 SoCs.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-fbdev@vger.kernel.org
---
drivers/video/Kconfig | 9 +
drivers/video/Makefile | 1 +
drivers/video/jz4740_fb.c | 818 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/jz4740_fb.h | 58 ++++
4 files changed, 886 insertions(+), 0 deletions(-)
create mode 100644 drivers/video/jz4740_fb.c
create mode 100644 include/linux/jz4740_fb.h

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 1e6fec4..f3b3893 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -2229,6 +2229,15 @@ config FB_BROADSHEET
and could also have been called by other names when coupled with
a bridge adapter.

+config FB_JZ4740
+ tristate "JZ4740 LCD framebuffer support"
+ depends on FB
+ select FB_SYS_FILLRECT
+ select FB_SYS_COPYAREA
+ select FB_SYS_IMAGEBLIT
+ help
+ Framebuffer support for the JZ4740 SoC.
+
source "drivers/video/omap/Kconfig"
source "drivers/video/omap2/Kconfig"

diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index ddc2af2..f56a9ca 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -131,6 +131,7 @@ obj-$(CONFIG_FB_CARMINE) += carminefb.o
obj-$(CONFIG_FB_MB862XX) += mb862xx/
obj-$(CONFIG_FB_MSM) += msm/
obj-$(CONFIG_FB_NUC900) += nuc900fb.o
+obj-$(CONFIG_FB_JZ4740) += jz4740_fb.o

# Platform or fallback drivers go here
obj-$(CONFIG_FB_UVESA) += uvesafb.o
diff --git a/drivers/video/jz4740_fb.c b/drivers/video/jz4740_fb.c
new file mode 100644
index 0000000..81f280d
--- /dev/null
+++ b/drivers/video/jz4740_fb.c
@@ -0,0 +1,818 @@
+/*
+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
+ * JZ4740 SoC LCD framebuffer driver
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+
+#include <linux/console.h>
+#include <linux/fb.h>
+
+#include <linux/dma-mapping.h>
+
+#include <linux/jz4740_fb.h>
+#include <asm/mach-jz4740/gpio.h>
+
+#define JZ_REG_LCD_CFG 0x00
+#define JZ_REG_LCD_VSYNC 0x04
+#define JZ_REG_LCD_HSYNC 0x08
+#define JZ_REG_LCD_VAT 0x0C
+#define JZ_REG_LCD_DAH 0x10
+#define JZ_REG_LCD_DAV 0x14
+#define JZ_REG_LCD_PS 0x18
+#define JZ_REG_LCD_CLS 0x1C
+#define JZ_REG_LCD_SPL 0x20
+#define JZ_REG_LCD_REV 0x24
+#define JZ_REG_LCD_CTRL 0x30
+#define JZ_REG_LCD_STATE 0x34
+#define JZ_REG_LCD_IID 0x38
+#define JZ_REG_LCD_DA0 0x40
+#define JZ_REG_LCD_SA0 0x44
+#define JZ_REG_LCD_FID0 0x48
+#define JZ_REG_LCD_CMD0 0x4C
+#define JZ_REG_LCD_DA1 0x50
+#define JZ_REG_LCD_SA1 0x54
+#define JZ_REG_LCD_FID1 0x58
+#define JZ_REG_LCD_CMD1 0x5C
+
+#define JZ_LCD_CFG_SLCD BIT(31)
+#define JZ_LCD_CFG_PS_DISABLE BIT(23)
+#define JZ_LCD_CFG_CLS_DISABLE BIT(22)
+#define JZ_LCD_CFG_SPL_DISABLE BIT(21)
+#define JZ_LCD_CFG_REV_DISABLE BIT(20)
+#define JZ_LCD_CFG_HSYNCM BIT(19)
+#define JZ_LCD_CFG_PCLKM BIT(18)
+#define JZ_LCD_CFG_INV BIT(17)
+#define JZ_LCD_CFG_SYNC_DIR BIT(16)
+#define JZ_LCD_CFG_PS_POLARITY BIT(15)
+#define JZ_LCD_CFG_CLS_POLARITY BIT(14)
+#define JZ_LCD_CFG_SPL_POLARITY BIT(13)
+#define JZ_LCD_CFG_REV_POLARITY BIT(12)
+#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW BIT(11)
+#define JZ_LCD_CFG_PCLK_FALLING_EDGE BIT(10)
+#define JZ_LCD_CFG_DE_ACTIVE_LOW BIT(9)
+#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW BIT(8)
+#define JZ_LCD_CFG_18_BIT BIT(7)
+#define JZ_LCD_CFG_PDW (BIT(5) | BIT(4))
+#define JZ_LCD_CFG_MODE_MASK 0xf
+
+#define JZ_LCD_CTRL_BURST_4 (0x0 << 28)
+#define JZ_LCD_CTRL_BURST_8 (0x1 << 28)
+#define JZ_LCD_CTRL_BURST_16 (0x2 << 28)
+#define JZ_LCD_CTRL_RGB555 BIT(27)
+#define JZ_LCD_CTRL_OFUP BIT(26)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_16 (0x0 << 24)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_4 (0x1 << 24)
+#define JZ_LCD_CTRL_FRC_GRAYSCALE_2 (0x2 << 24)
+#define JZ_LCD_CTRL_PDD_MASK (0xff << 16)
+#define JZ_LCD_CTRL_EOF_IRQ BIT(13)
+#define JZ_LCD_CTRL_SOF_IRQ BIT(12)
+#define JZ_LCD_CTRL_OFU_IRQ BIT(11)
+#define JZ_LCD_CTRL_IFU0_IRQ BIT(10)
+#define JZ_LCD_CTRL_IFU1_IRQ BIT(9)
+#define JZ_LCD_CTRL_DD_IRQ BIT(8)
+#define JZ_LCD_CTRL_QDD_IRQ BIT(7)
+#define JZ_LCD_CTRL_REVERSE_ENDIAN BIT(6)
+#define JZ_LCD_CTRL_LSB_FISRT BIT(5)
+#define JZ_LCD_CTRL_DISABLE BIT(4)
+#define JZ_LCD_CTRL_ENABLE BIT(3)
+#define JZ_LCD_CTRL_BPP_1 0x0
+#define JZ_LCD_CTRL_BPP_2 0x1
+#define JZ_LCD_CTRL_BPP_4 0x2
+#define JZ_LCD_CTRL_BPP_8 0x3
+#define JZ_LCD_CTRL_BPP_15_16 0x4
+#define JZ_LCD_CTRL_BPP_18_24 0x5
+
+#define JZ_LCD_CMD_SOF_IRQ BIT(15)
+#define JZ_LCD_CMD_EOF_IRQ BIT(16)
+#define JZ_LCD_CMD_ENABLE_PAL BIT(12)
+
+#define JZ_LCD_SYNC_MASK 0x3ff
+
+#define JZ_LCD_STATE_DISABLED BIT(0)
+
+struct jzfb_framedesc {
+ uint32_t next;
+ uint32_t addr;
+ uint32_t id;
+ uint32_t cmd;
+} __attribute__((packed));
+
+struct jzfb {
+ struct fb_info *fb;
+ struct platform_device *pdev;
+ void __iomem *base;
+ struct resource *mem;
+ struct jz4740_fb_platform_data *pdata;
+
+ size_t vidmem_size;
+ void *vidmem;
+ dma_addr_t vidmem_phys;
+ struct jzfb_framedesc *framedesc;
+ dma_addr_t framedesc_phys;
+
+ struct clk *ldclk;
+ struct clk *lpclk;
+
+ unsigned is_enabled:1;
+ struct mutex lock;
+
+ uint32_t pseudo_palette[16];
+};
+
+static struct fb_fix_screeninfo jzfb_fix __devinitdata = {
+ .id = "JZ4740 FB",
+ .type = FB_TYPE_PACKED_PIXELS,
+ .visual = FB_VISUAL_TRUECOLOR,
+ .xpanstep = 0,
+ .ypanstep = 0,
+ .ywrapstep = 0,
+ .accel = FB_ACCEL_NONE,
+};
+
+static const struct jz_gpio_bulk_request jz_lcd_ctrl_pins[] = {
+ JZ_GPIO_BULK_PIN(LCD_PCLK),
+ JZ_GPIO_BULK_PIN(LCD_HSYNC),
+ JZ_GPIO_BULK_PIN(LCD_VSYNC),
+ JZ_GPIO_BULK_PIN(LCD_DE),
+ JZ_GPIO_BULK_PIN(LCD_PS),
+ JZ_GPIO_BULK_PIN(LCD_REV),
+};
+
+static const struct jz_gpio_bulk_request jz_lcd_data_pins[] = {
+ JZ_GPIO_BULK_PIN(LCD_DATA0),
+ JZ_GPIO_BULK_PIN(LCD_DATA1),
+ JZ_GPIO_BULK_PIN(LCD_DATA2),
+ JZ_GPIO_BULK_PIN(LCD_DATA3),
+ JZ_GPIO_BULK_PIN(LCD_DATA4),
+ JZ_GPIO_BULK_PIN(LCD_DATA5),
+ JZ_GPIO_BULK_PIN(LCD_DATA6),
+ JZ_GPIO_BULK_PIN(LCD_DATA7),
+ JZ_GPIO_BULK_PIN(LCD_DATA8),
+ JZ_GPIO_BULK_PIN(LCD_DATA9),
+ JZ_GPIO_BULK_PIN(LCD_DATA10),
+ JZ_GPIO_BULK_PIN(LCD_DATA11),
+ JZ_GPIO_BULK_PIN(LCD_DATA12),
+ JZ_GPIO_BULK_PIN(LCD_DATA13),
+ JZ_GPIO_BULK_PIN(LCD_DATA14),
+ JZ_GPIO_BULK_PIN(LCD_DATA15),
+ JZ_GPIO_BULK_PIN(LCD_DATA16),
+ JZ_GPIO_BULK_PIN(LCD_DATA17),
+};
+
+static unsigned int jzfb_num_ctrl_pins(struct jzfb *jzfb)
+{
+ unsigned int num;
+
+ switch (jzfb->pdata->lcd_type) {
+ case JZ_LCD_TYPE_GENERIC_16_BIT:
+ num = 4;
+ break;
+ case JZ_LCD_TYPE_GENERIC_18_BIT:
+ num = 4;
+ break;
+ case JZ_LCD_TYPE_8BIT_SERIAL:
+ num = 3;
+ break;
+ default:
+ num = 0;
+ break;
+ }
+ return num;
+}
+
+static unsigned int jzfb_num_data_pins(struct jzfb *jzfb)
+{
+ unsigned int num;
+
+ switch (jzfb->pdata->lcd_type) {
+ case JZ_LCD_TYPE_GENERIC_16_BIT:
+ num = 16;
+ break;
+ case JZ_LCD_TYPE_GENERIC_18_BIT:
+ num = 18;
+ break;
+ case JZ_LCD_TYPE_8BIT_SERIAL:
+ num = 8;
+ break;
+ default:
+ num = 0;
+ break;
+ }
+ return num;
+}
+
+/* Based on CNVT_TOHW macro from skeletonfb.c */
+static inline uint32_t jzfb_convert_color_to_hw(unsigned val,
+ struct fb_bitfield *bf)
+{
+ return (((val << bf->length) + 0x7FFF - val) >> 16) << bf->offset;
+}
+
+static int jzfb_setcolreg(unsigned regno, unsigned red, unsigned green,
+ unsigned blue, unsigned transp, struct fb_info *fb)
+{
+ uint32_t color;
+
+ if (regno >= 16)
+ return -EINVAL;
+
+ color = jzfb_convert_color_to_hw(red, fb->var.red.length);
+ color |= jzfb_convert_color_to_hw(green, fb->var.green.length);
+ color |= jzfb_convert_color_to_hw(blue, fb->var.blue.length);
+ color |= jzfb_convert_color_to_hw(transp, fb->var.transp.length);
+
+ ((uint32_t *)(fb->pseudo_palette))[regno] = color;
+
+ return 0;
+}
+
+static int jzfb_get_controller_bpp(struct jzfb *jzfb)
+{
+ switch (jzfb->pdata->bpp) {
+ case 18:
+ case 24:
+ return 32;
+ case 15:
+ return 16;
+ default:
+ return jzfb->pdata->bpp;
+ }
+}
+
+static struct fb_videomode *jzfb_get_mode(struct jzfb *jzfb,
+ struct fb_var_screeninfo *var)
+{
+ size_t i;
+ struct fb_videomode *mode = jzfb->pdata->modes;
+
+ for (i = 0; i < jzfb->pdata->num_modes; ++i, ++mode) {
+ if (mode->xres == var->xres && mode->yres == var->yres)
+ return mode;
+ }
+
+ return NULL;
+}
+
+static int jzfb_check_var(struct fb_var_screeninfo *var, struct fb_info *fb)
+{
+ struct jzfb *jzfb = fb->par;
+ struct fb_videomode *mode;
+
+ if (var->bits_per_pixel != jzfb_get_controller_bpp(jzfb) &&
+ var->bits_per_pixel != jzfb->pdata->bpp)
+ return -EINVAL;
+
+ mode = jzfb_get_mode(jzfb, var);
+ if (mode == NULL)
+ return -EINVAL;
+
+ fb_videomode_to_var(var, mode);
+
+ switch (jzfb->pdata->bpp) {
+ case 8:
+ break;
+ case 15:
+ var->red.offset = 10;
+ var->red.length = 5;
+ var->green.offset = 6;
+ var->green.length = 5;
+ var->blue.offset = 0;
+ var->blue.length = 5;
+ break;
+ case 16:
+ var->red.offset = 11;
+ var->red.length = 5;
+ var->green.offset = 5;
+ var->green.length = 6;
+ var->blue.offset = 0;
+ var->blue.length = 5;
+ break;
+ case 18:
+ var->red.offset = 16;
+ var->red.length = 6;
+ var->green.offset = 8;
+ var->green.length = 6;
+ var->blue.offset = 0;
+ var->blue.length = 6;
+ var->bits_per_pixel = 32;
+ break;
+ case 32:
+ case 24:
+ var->transp.offset = 24;
+ var->transp.length = 8;
+ var->red.offset = 16;
+ var->red.length = 8;
+ var->green.offset = 8;
+ var->green.length = 8;
+ var->blue.offset = 0;
+ var->blue.length = 8;
+ var->bits_per_pixel = 32;
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int jzfb_set_par(struct fb_info *info)
+{
+ struct jzfb *jzfb = info->par;
+ struct fb_var_screeninfo *var = &info->var;
+ struct fb_videomode *mode;
+ uint16_t hds, vds;
+ uint16_t hde, vde;
+ uint16_t ht, vt;
+ uint32_t ctrl;
+ uint32_t cfg;
+ unsigned long rate;
+
+ mode = jzfb_get_mode(jzfb, var);
+ if (mode == NULL)
+ return -EINVAL;
+
+ info->mode = mode;
+
+ hds = mode->hsync_len + mode->left_margin;
+ hde = hds + mode->xres;
+ ht = hde + mode->right_margin;
+
+ vds = mode->vsync_len + mode->upper_margin;
+ vde = vds + mode->yres;
+ vt = vde + mode->lower_margin;
+
+ ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
+
+ switch (jzfb->pdata->bpp) {
+ case 1:
+ ctrl |= JZ_LCD_CTRL_BPP_1;
+ break;
+ case 2:
+ ctrl |= JZ_LCD_CTRL_BPP_2;
+ break;
+ case 4:
+ ctrl |= JZ_LCD_CTRL_BPP_4;
+ break;
+ case 8:
+ ctrl |= JZ_LCD_CTRL_BPP_8;
+ break;
+ case 15:
+ ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
+ case 16:
+ ctrl |= JZ_LCD_CTRL_BPP_15_16;
+ break;
+ case 18:
+ case 24:
+ case 32:
+ ctrl |= JZ_LCD_CTRL_BPP_18_24;
+ break;
+ default:
+ break;
+ }
+
+ cfg = 0;
+ cfg |= JZ_LCD_CFG_PS_DISABLE;
+ cfg |= JZ_LCD_CFG_CLS_DISABLE;
+ cfg |= JZ_LCD_CFG_SPL_DISABLE;
+ cfg |= JZ_LCD_CFG_REV_DISABLE;
+
+ if (!(mode->sync & FB_SYNC_HOR_HIGH_ACT))
+ cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
+
+ if (!(mode->sync & FB_SYNC_VERT_HIGH_ACT))
+ cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
+
+ if (jzfb->pdata->pixclk_falling_edge)
+ cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
+
+ if (jzfb->pdata->date_enable_active_low)
+ cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
+
+ if (jzfb->pdata->lcd_type == JZ_LCD_TYPE_GENERIC_18_BIT)
+ cfg |= JZ_LCD_CFG_18_BIT;
+
+ cfg |= jzfb->pdata->lcd_type & 0xf;
+
+ if (mode->pixclock) {
+ rate = PICOS2KHZ(mode->pixclock) * 1000;
+ mode->refresh = rate / vt / ht;
+ } else {
+ if (jzfb->pdata->lcd_type == JZ_LCD_TYPE_8BIT_SERIAL)
+ rate = mode->refresh * (vt + 2 * mode->xres) * ht;
+ else
+ rate = mode->refresh * vt * ht;
+
+ mode->pixclock = KHZ2PICOS(rate / 1000);
+ }
+
+ mutex_lock(&jzfb->lock);
+ if (!jzfb->is_enabled)
+ clk_enable(jzfb->ldclk);
+ else
+ ctrl |= JZ_LCD_CTRL_ENABLE;
+
+ writel(mode->hsync_len, jzfb->base + JZ_REG_LCD_HSYNC);
+ writel(mode->vsync_len, jzfb->base + JZ_REG_LCD_VSYNC);
+
+ writel((ht << 16) | vt, jzfb->base + JZ_REG_LCD_VAT);
+
+ writel((hds << 16) | hde, jzfb->base + JZ_REG_LCD_DAH);
+ writel((vds << 16) | vde, jzfb->base + JZ_REG_LCD_DAV);
+
+ writel(cfg, jzfb->base + JZ_REG_LCD_CFG);
+
+ writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
+
+ if (!jzfb->is_enabled)
+ clk_disable(jzfb->ldclk);
+ mutex_unlock(&jzfb->lock);
+
+ clk_set_rate(jzfb->lpclk, rate);
+ clk_set_rate(jzfb->ldclk, rate * 3);
+
+ return 0;
+}
+
+static void jzfb_enable(struct jzfb *jzfb)
+{
+ uint32_t ctrl;
+
+ clk_enable(jzfb->ldclk);
+
+ jz_gpio_bulk_resume(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
+ jz_gpio_bulk_resume(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
+
+ writel(0, jzfb->base + JZ_REG_LCD_STATE);
+
+ writel(jzfb->framedesc->next, jzfb->base + JZ_REG_LCD_DA0);
+
+ ctrl = readl(jzfb->base + JZ_REG_LCD_CTRL);
+ ctrl |= JZ_LCD_CTRL_ENABLE;
+ ctrl &= ~JZ_LCD_CTRL_DISABLE;
+ writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
+}
+
+static void jzfb_disable(struct jzfb *jzfb)
+{
+ uint32_t ctrl;
+
+ ctrl = readl(jzfb->base + JZ_REG_LCD_CTRL);
+ ctrl |= JZ_LCD_CTRL_DISABLE;
+ writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
+ do {
+ ctrl = readl(jzfb->base + JZ_REG_LCD_STATE);
+ } while (!(ctrl & JZ_LCD_STATE_DISABLED));
+
+ jz_gpio_bulk_suspend(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
+ jz_gpio_bulk_suspend(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
+
+ clk_disable(jzfb->ldclk);
+}
+
+static int jzfb_blank(int blank_mode, struct fb_info *info)
+{
+ struct jzfb *jzfb = info->par;
+
+ switch (blank_mode) {
+ case FB_BLANK_UNBLANK:
+ mutex_lock(&jzfb->lock);
+ if (jzfb->is_enabled) {
+ mutex_unlock(&jzfb->lock);
+ return 0;
+ }
+
+ jzfb_enable(jzfb);
+ jzfb->is_enabled = 1;
+
+ mutex_unlock(&jzfb->lock);
+
+ break;
+ default:
+ mutex_lock(&jzfb->lock);
+ if (!jzfb->is_enabled) {
+ mutex_unlock(&jzfb->lock);
+ return 0;
+ }
+
+ jzfb_disable(jzfb);
+
+ jzfb->is_enabled = 0;
+ mutex_unlock(&jzfb->lock);
+ break;
+ }
+
+ return 0;
+}
+
+static int jzfb_alloc_devmem(struct jzfb *jzfb)
+{
+ int max_videosize = 0;
+ struct fb_videomode *mode = jzfb->pdata->modes;
+ void *page;
+ int i;
+
+ for (i = 0; i < jzfb->pdata->num_modes; ++mode, ++i) {
+ if (max_videosize < mode->xres * mode->yres)
+ max_videosize = mode->xres * mode->yres;
+ }
+
+ max_videosize *= jzfb_get_controller_bpp(jzfb) >> 3;
+
+ jzfb->framedesc = dma_alloc_coherent(&jzfb->pdev->dev,
+ sizeof(*jzfb->framedesc),
+ &jzfb->framedesc_phys, GFP_KERNEL);
+
+ if (!jzfb->framedesc)
+ return -ENOMEM;
+
+ jzfb->vidmem_size = PAGE_ALIGN(max_videosize);
+ jzfb->vidmem = dma_alloc_coherent(&jzfb->pdev->dev,
+ jzfb->vidmem_size,
+ &jzfb->vidmem_phys, GFP_KERNEL);
+
+ if (!jzfb->vidmem)
+ goto err_free_framedesc;
+
+ for (page = jzfb->vidmem;
+ page < jzfb->vidmem + PAGE_ALIGN(jzfb->vidmem_size);
+ page += PAGE_SIZE) {
+ SetPageReserved(virt_to_page(page));
+ }
+
+ jzfb->framedesc->next = jzfb->framedesc_phys;
+ jzfb->framedesc->addr = jzfb->vidmem_phys;
+ jzfb->framedesc->id = 0xdeafbead;
+ jzfb->framedesc->cmd = 0;
+ jzfb->framedesc->cmd |= max_videosize / 4;
+
+ return 0;
+
+err_free_framedesc:
+ dma_free_coherent(&jzfb->pdev->dev, sizeof(*jzfb->framedesc),
+ jzfb->framedesc, jzfb->framedesc_phys);
+ return -ENOMEM;
+}
+
+static void jzfb_free_devmem(struct jzfb *jzfb)
+{
+ dma_free_coherent(&jzfb->pdev->dev, jzfb->vidmem_size,
+ jzfb->vidmem, jzfb->vidmem_phys);
+ dma_free_coherent(&jzfb->pdev->dev, sizeof(*jzfb->framedesc),
+ jzfb->framedesc, jzfb->framedesc_phys);
+}
+
+static struct fb_ops jzfb_ops = {
+ .owner = THIS_MODULE,
+ .fb_check_var = jzfb_check_var,
+ .fb_set_par = jzfb_set_par,
+ .fb_blank = jzfb_blank,
+ .fb_fillrect = sys_fillrect,
+ .fb_copyarea = sys_copyarea,
+ .fb_imageblit = sys_imageblit,
+ .fb_setcolreg = jzfb_setcolreg,
+};
+
+static int __devinit jzfb_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct jzfb *jzfb;
+ struct fb_info *fb;
+ struct jz4740_fb_platform_data *pdata = pdev->dev.platform_data;
+ struct resource *mem;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "Missing platform data\n");
+ return -ENOENT;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem) {
+ dev_err(&pdev->dev, "Failed to get register memory resource\n");
+ return -ENOENT;
+ }
+
+ mem = request_mem_region(mem->start, resource_size(mem), pdev->name);
+ if (!mem) {
+ dev_err(&pdev->dev, "Failed to request register memory region\n");
+ return -EBUSY;
+ }
+
+ fb = framebuffer_alloc(sizeof(struct jzfb), &pdev->dev);
+ if (!fb) {
+ dev_err(&pdev->dev, "Failed to allocate framebuffer device\n");
+ ret = -ENOMEM;
+ goto err_release_mem_region;
+ }
+
+ fb->fbops = &jzfb_ops;
+ fb->flags = FBINFO_DEFAULT;
+
+ jzfb = fb->par;
+ jzfb->pdev = pdev;
+ jzfb->pdata = pdata;
+ jzfb->mem = mem;
+
+ jzfb->ldclk = clk_get(&pdev->dev, "lcd");
+ if (IS_ERR(jzfb->ldclk)) {
+ ret = PTR_ERR(jzfb->ldclk);
+ dev_err(&pdev->dev, "Failed to get lcd clock: %d\n", ret);
+ goto err_framebuffer_release;
+ }
+
+ jzfb->lpclk = clk_get(&pdev->dev, "lcd_pclk");
+ if (IS_ERR(jzfb->lpclk)) {
+ ret = PTR_ERR(jzfb->lpclk);
+ dev_err(&pdev->dev, "Failed to get lcd pixel clock: %d\n", ret);
+ goto err_put_ldclk;
+ }
+
+ jzfb->base = ioremap(mem->start, resource_size(mem));
+
+ if (!jzfb->base) {
+ dev_err(&pdev->dev, "Failed to ioremap register memory region\n");
+ ret = -EBUSY;
+ goto err_put_lpclk;
+ }
+
+ platform_set_drvdata(pdev, jzfb);
+
+ fb_videomode_to_modelist(pdata->modes, pdata->num_modes,
+ &fb->modelist);
+ fb->mode = pdata->modes;
+
+ fb_videomode_to_var(&fb->var, fb->mode);
+ fb->var.bits_per_pixel = pdata->bpp;
+ jzfb_check_var(&fb->var, fb);
+
+ ret = jzfb_alloc_devmem(jzfb);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to allocate video memory\n");
+ goto err_iounmap;
+ }
+
+ fb->fix = jzfb_fix;
+ fb->fix.line_length = fb->var.bits_per_pixel * fb->var.xres / 8;
+ fb->fix.mmio_start = mem->start;
+ fb->fix.mmio_len = resource_size(mem);
+ fb->fix.smem_start = jzfb->vidmem_phys;
+ fb->fix.smem_len = fb->fix.line_length * fb->var.yres;
+ fb->screen_base = jzfb->vidmem;
+ fb->pseudo_palette = jzfb->pseudo_palette;
+
+ fb_alloc_cmap(&fb->cmap, 256, 0);
+
+ mutex_init(&jzfb->lock);
+
+ clk_enable(jzfb->ldclk);
+ jzfb->is_enabled = 1;
+
+ writel(jzfb->framedesc->next, jzfb->base + JZ_REG_LCD_DA0);
+ jzfb_set_par(fb);
+
+ jz_gpio_bulk_request(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
+ jz_gpio_bulk_request(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
+
+ ret = register_framebuffer(fb);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register framebuffer: %d\n", ret);
+ goto err_free_devmem;
+ }
+
+ jzfb->fb = fb;
+
+ return 0;
+
+err_free_devmem:
+ jz_gpio_bulk_free(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
+ jz_gpio_bulk_free(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
+
+ fb_dealloc_cmap(&fb->cmap);
+ jzfb_free_devmem(jzfb);
+err_iounmap:
+ iounmap(jzfb->base);
+err_put_lpclk:
+ clk_put(jzfb->lpclk);
+err_put_ldclk:
+ clk_put(jzfb->ldclk);
+err_framebuffer_release:
+ framebuffer_release(fb);
+err_release_mem_region:
+ release_mem_region(mem->start, resource_size(mem));
+ return ret;
+}
+
+static int __devexit jzfb_remove(struct platform_device *pdev)
+{
+ struct jzfb *jzfb = platform_get_drvdata(pdev);
+
+ jzfb_blank(FB_BLANK_POWERDOWN, jzfb->fb);
+
+ jz_gpio_bulk_free(jz_lcd_ctrl_pins, jzfb_num_ctrl_pins(jzfb));
+ jz_gpio_bulk_free(jz_lcd_data_pins, jzfb_num_data_pins(jzfb));
+
+ iounmap(jzfb->base);
+ release_mem_region(jzfb->mem->start, resource_size(jzfb->mem));
+
+ fb_dealloc_cmap(&jzfb->fb->cmap);
+ jzfb_free_devmem(jzfb);
+
+ platform_set_drvdata(pdev, NULL);
+
+ clk_put(jzfb->lpclk);
+ clk_put(jzfb->ldclk);
+
+ framebuffer_release(jzfb->fb);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int jzfb_suspend(struct device *dev)
+{
+ struct jzfb *jzfb = dev_get_drvdata(dev);
+
+ acquire_console_sem();
+ fb_set_suspend(jzfb->fb, 1);
+ release_console_sem();
+
+ mutex_lock(&jzfb->lock);
+ if (jzfb->is_enabled)
+ jzfb_disable(jzfb);
+ mutex_unlock(&jzfb->lock);
+
+ return 0;
+}
+
+static int jzfb_resume(struct device *dev)
+{
+ struct jzfb *jzfb = dev_get_drvdata(dev);
+ clk_enable(jzfb->ldclk);
+
+ mutex_lock(&jzfb->lock);
+ if (jzfb->is_enabled)
+ jzfb_enable(jzfb);
+ mutex_unlock(&jzfb->lock);
+
+ acquire_console_sem();
+ fb_set_suspend(jzfb->fb, 0);
+ release_console_sem();
+
+ return 0;
+}
+
+static const struct dev_pm_ops jzfb_pm_ops = {
+ .suspend = jzfb_suspend,
+ .resume = jzfb_resume,
+ .poweroff = jzfb_suspend,
+ .restore = jzfb_resume,
+};
+
+#define JZFB_PM_OPS (&jzfb_pm_ops)
+
+#else
+#define JZFB_PM_OPS NULL
+#endif
+
+static struct platform_driver jzfb_driver = {
+ .probe = jzfb_probe,
+ .remove = __devexit_p(jzfb_remove),
+ .driver = {
+ .name = "jz4740-fb",
+ .pm = JZFB_PM_OPS,
+ },
+};
+
+static int __init jzfb_init(void)
+{
+ return platform_driver_register(&jzfb_driver);
+}
+module_init(jzfb_init);
+
+static void __exit jzfb_exit(void)
+{
+ platform_driver_unregister(&jzfb_driver);
+}
+module_exit(jzfb_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("JZ4740 SoC LCD framebuffer driver");
+MODULE_ALIAS("platform:jz4740-fb");
diff --git a/include/linux/jz4740_fb.h b/include/linux/jz4740_fb.h
new file mode 100644
index 0000000..ab4c963
--- /dev/null
+++ b/include/linux/jz4740_fb.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifndef __LINUX_JZ4740_FB_H
+#define __LINUX_JZ4740_FB_H
+
+#include <linux/fb.h>
+
+enum jz4740_fb_lcd_type {
+ JZ_LCD_TYPE_GENERIC_16_BIT = 0,
+ JZ_LCD_TYPE_GENERIC_18_BIT = 0 | (1 << 4),
+ JZ_LCD_TYPE_SPECIAL_TFT_1 = 1,
+ JZ_LCD_TYPE_SPECIAL_TFT_2 = 2,
+ JZ_LCD_TYPE_SPECIAL_TFT_3 = 3,
+ JZ_LCD_TYPE_NON_INTERLACED_CCIR656 = 5,
+ JZ_LCD_TYPE_INTERLACED_CCIR656 = 7,
+ JZ_LCD_TYPE_SINGLE_COLOR_STN = 8,
+ JZ_LCD_TYPE_SINGLE_MONOCHROME_STN = 9,
+ JZ_LCD_TYPE_DUAL_COLOR_STN = 10,
+ JZ_LCD_TYPE_DUAL_MONOCHROME_STN = 11,
+ JZ_LCD_TYPE_8BIT_SERIAL = 12,
+};
+
+/*
+* width: width of the lcd display in mm
+* height: height of the lcd display in mm
+* num_modes: size of modes
+* modes: list of valid video modes
+* bpp: bits per pixel for the lcd
+* lcd_type: lcd type
+*/
+
+struct jz4740_fb_platform_data {
+ unsigned int width;
+ unsigned int height;
+
+ size_t num_modes;
+ struct fb_videomode *modes;
+
+ unsigned int bpp;
+ enum jz4740_fb_lcd_type lcd_type;
+
+ unsigned pixclk_falling_edge:1;
+ unsigned date_enable_active_low:1;
+};
+
+#endif
--
1.5.6.5