diff options
Diffstat (limited to 'drivers/video/fbdev/omap/lcdc.c')
| -rw-r--r-- | drivers/video/fbdev/omap/lcdc.c | 782 |
1 files changed, 782 insertions, 0 deletions
diff --git a/drivers/video/fbdev/omap/lcdc.c b/drivers/video/fbdev/omap/lcdc.c new file mode 100644 index 000000000..e7ce783e5 --- /dev/null +++ b/drivers/video/fbdev/omap/lcdc.c @@ -0,0 +1,782 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * OMAP1 internal LCD controller + * + * Copyright (C) 2004 Nokia Corporation + * Author: Imre Deak <imre.deak@nokia.com> + */ +#include <linux/module.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/err.h> +#include <linux/mm.h> +#include <linux/fb.h> +#include <linux/dma-mapping.h> +#include <linux/vmalloc.h> +#include <linux/clk.h> +#include <linux/gfp.h> + +#include <linux/soc/ti/omap1-io.h> +#include <linux/soc/ti/omap1-soc.h> +#include <linux/omap-dma.h> + +#include <asm/mach-types.h> + +#include "omapfb.h" + +#include "lcdc.h" +#include "lcd_dma.h" + +#define MODULE_NAME "lcdc" + +#define MAX_PALETTE_SIZE PAGE_SIZE + +enum lcdc_load_mode { + OMAP_LCDC_LOAD_PALETTE, + OMAP_LCDC_LOAD_FRAME, + OMAP_LCDC_LOAD_PALETTE_AND_FRAME +}; + +static struct omap_lcd_controller { + enum omapfb_update_mode update_mode; + int ext_mode; + + unsigned long frame_offset; + int screen_width; + int xres; + int yres; + + enum omapfb_color_format color_mode; + int bpp; + void *palette_virt; + dma_addr_t palette_phys; + int palette_code; + int palette_size; + + unsigned int irq_mask; + struct completion last_frame_complete; + struct completion palette_load_complete; + struct clk *lcd_ck; + struct omapfb_device *fbdev; + + void (*dma_callback)(void *data); + void *dma_callback_data; + + dma_addr_t vram_phys; + void *vram_virt; + unsigned long vram_size; +} lcdc; + +static inline void enable_irqs(int mask) +{ + lcdc.irq_mask |= mask; +} + +static inline void disable_irqs(int mask) +{ + lcdc.irq_mask &= ~mask; +} + +static void set_load_mode(enum lcdc_load_mode mode) +{ + u32 l; + + l = omap_readl(OMAP_LCDC_CONTROL); + l &= ~(3 << 20); + switch (mode) { + case OMAP_LCDC_LOAD_PALETTE: + l |= 1 << 20; + break; + case OMAP_LCDC_LOAD_FRAME: + l |= 2 << 20; + break; + case OMAP_LCDC_LOAD_PALETTE_AND_FRAME: + break; + default: + BUG(); + } + omap_writel(l, OMAP_LCDC_CONTROL); +} + +static void enable_controller(void) +{ + u32 l; + + l = omap_readl(OMAP_LCDC_CONTROL); + l |= OMAP_LCDC_CTRL_LCD_EN; + l &= ~OMAP_LCDC_IRQ_MASK; + l |= lcdc.irq_mask | OMAP_LCDC_IRQ_DONE; /* enabled IRQs */ + omap_writel(l, OMAP_LCDC_CONTROL); +} + +static void disable_controller_async(void) +{ + u32 l; + u32 mask; + + l = omap_readl(OMAP_LCDC_CONTROL); + mask = OMAP_LCDC_CTRL_LCD_EN | OMAP_LCDC_IRQ_MASK; + /* + * Preserve the DONE mask, since we still want to get the + * final DONE irq. It will be disabled in the IRQ handler. + */ + mask &= ~OMAP_LCDC_IRQ_DONE; + l &= ~mask; + omap_writel(l, OMAP_LCDC_CONTROL); +} + +static void disable_controller(void) +{ + init_completion(&lcdc.last_frame_complete); + disable_controller_async(); + if (!wait_for_completion_timeout(&lcdc.last_frame_complete, + msecs_to_jiffies(500))) + dev_err(lcdc.fbdev->dev, "timeout waiting for FRAME DONE\n"); +} + +static void reset_controller(u32 status) +{ + static unsigned long reset_count; + static unsigned long last_jiffies; + + disable_controller_async(); + reset_count++; + if (reset_count == 1 || time_after(jiffies, last_jiffies + HZ)) { + dev_err(lcdc.fbdev->dev, + "resetting (status %#010x,reset count %lu)\n", + status, reset_count); + last_jiffies = jiffies; + } + if (reset_count < 100) { + enable_controller(); + } else { + reset_count = 0; + dev_err(lcdc.fbdev->dev, + "too many reset attempts, giving up.\n"); + } +} + +/* + * Configure the LCD DMA according to the current mode specified by parameters + * in lcdc.fbdev and fbdev->var. + */ +static void setup_lcd_dma(void) +{ + static const int dma_elem_type[] = { + 0, + OMAP_DMA_DATA_TYPE_S8, + OMAP_DMA_DATA_TYPE_S16, + 0, + OMAP_DMA_DATA_TYPE_S32, + }; + struct omapfb_plane_struct *plane = lcdc.fbdev->fb_info[0]->par; + struct fb_var_screeninfo *var = &lcdc.fbdev->fb_info[0]->var; + unsigned long src; + int esize, xelem, yelem; + + src = lcdc.vram_phys + lcdc.frame_offset; + + switch (var->rotate) { + case 0: + if (plane->info.mirror || (src & 3) || + lcdc.color_mode == OMAPFB_COLOR_YUV420 || + (lcdc.xres & 1)) + esize = 2; + else + esize = 4; + xelem = lcdc.xres * lcdc.bpp / 8 / esize; + yelem = lcdc.yres; + break; + case 90: + case 180: + case 270: + if (cpu_is_omap15xx()) { + BUG(); + } + esize = 2; + xelem = lcdc.yres * lcdc.bpp / 16; + yelem = lcdc.xres; + break; + default: + BUG(); + return; + } +#ifdef VERBOSE + dev_dbg(lcdc.fbdev->dev, + "setup_dma: src %#010lx esize %d xelem %d yelem %d\n", + src, esize, xelem, yelem); +#endif + omap_set_lcd_dma_b1(src, xelem, yelem, dma_elem_type[esize]); + if (!cpu_is_omap15xx()) { + int bpp = lcdc.bpp; + + /* + * YUV support is only for external mode when we have the + * YUV window embedded in a 16bpp frame buffer. + */ + if (lcdc.color_mode == OMAPFB_COLOR_YUV420) + bpp = 16; + /* Set virtual xres elem size */ + omap_set_lcd_dma_b1_vxres( + lcdc.screen_width * bpp / 8 / esize); + /* Setup transformations */ + omap_set_lcd_dma_b1_rotation(var->rotate); + omap_set_lcd_dma_b1_mirror(plane->info.mirror); + } + omap_setup_lcd_dma(); +} + +static irqreturn_t lcdc_irq_handler(int irq, void *dev_id) +{ + u32 status; + + status = omap_readl(OMAP_LCDC_STATUS); + + if (status & (OMAP_LCDC_STAT_FUF | OMAP_LCDC_STAT_SYNC_LOST)) + reset_controller(status); + else { + if (status & OMAP_LCDC_STAT_DONE) { + u32 l; + + /* + * Disable IRQ_DONE. The status bit will be cleared + * only when the controller is reenabled and we don't + * want to get more interrupts. + */ + l = omap_readl(OMAP_LCDC_CONTROL); + l &= ~OMAP_LCDC_IRQ_DONE; + omap_writel(l, OMAP_LCDC_CONTROL); + complete(&lcdc.last_frame_complete); + } + if (status & OMAP_LCDC_STAT_LOADED_PALETTE) { + disable_controller_async(); + complete(&lcdc.palette_load_complete); + } + } + + /* + * Clear these interrupt status bits. + * Sync_lost, FUF bits were cleared by disabling the LCD controller + * LOADED_PALETTE can be cleared this way only in palette only + * load mode. In other load modes it's cleared by disabling the + * controller. + */ + status &= ~(OMAP_LCDC_STAT_VSYNC | + OMAP_LCDC_STAT_LOADED_PALETTE | + OMAP_LCDC_STAT_ABC | + OMAP_LCDC_STAT_LINE_INT); + omap_writel(status, OMAP_LCDC_STATUS); + return IRQ_HANDLED; +} + +/* + * Change to a new video mode. We defer this to a later time to avoid any + * flicker and not to mess up the current LCD DMA context. For this we disable + * the LCD controller, which will generate a DONE irq after the last frame has + * been transferred. Then it'll be safe to reconfigure both the LCD controller + * as well as the LCD DMA. + */ +static int omap_lcdc_setup_plane(int plane, int channel_out, + unsigned long offset, int screen_width, + int pos_x, int pos_y, int width, int height, + int color_mode) +{ + struct fb_var_screeninfo *var = &lcdc.fbdev->fb_info[0]->var; + struct lcd_panel *panel = lcdc.fbdev->panel; + int rot_x, rot_y; + + if (var->rotate == 0) { + rot_x = panel->x_res; + rot_y = panel->y_res; + } else { + rot_x = panel->y_res; + rot_y = panel->x_res; + } + if (plane != 0 || channel_out != 0 || pos_x != 0 || pos_y != 0 || + width > rot_x || height > rot_y) { +#ifdef VERBOSE + dev_dbg(lcdc.fbdev->dev, + "invalid plane params plane %d pos_x %d pos_y %d " + "w %d h %d\n", plane, pos_x, pos_y, width, height); +#endif + return -EINVAL; + } + + lcdc.frame_offset = offset; + lcdc.xres = width; + lcdc.yres = height; + lcdc.screen_width = screen_width; + lcdc.color_mode = color_mode; + + switch (color_mode) { + case OMAPFB_COLOR_CLUT_8BPP: + lcdc.bpp = 8; + lcdc.palette_code = 0x3000; + lcdc.palette_size = 512; + break; + case OMAPFB_COLOR_RGB565: + lcdc.bpp = 16; + lcdc.palette_code = 0x4000; + lcdc.palette_size = 32; + break; + case OMAPFB_COLOR_RGB444: + lcdc.bpp = 16; + lcdc.palette_code = 0x4000; + lcdc.palette_size = 32; + break; + case OMAPFB_COLOR_YUV420: + if (lcdc.ext_mode) { + lcdc.bpp = 12; + break; + } + fallthrough; + case OMAPFB_COLOR_YUV422: + if (lcdc.ext_mode) { + lcdc.bpp = 16; + break; + } + fallthrough; + default: + /* FIXME: other BPPs. + * bpp1: code 0, size 256 + * bpp2: code 0x1000 size 256 + * bpp4: code 0x2000 size 256 + * bpp12: code 0x4000 size 32 + */ + dev_dbg(lcdc.fbdev->dev, "invalid color mode %d\n", color_mode); + BUG(); + return -1; + } + + if (lcdc.ext_mode) { + setup_lcd_dma(); + return 0; + } + + if (lcdc.update_mode == OMAPFB_AUTO_UPDATE) { + disable_controller(); + omap_stop_lcd_dma(); + setup_lcd_dma(); + enable_controller(); + } + + return 0; +} + +static int omap_lcdc_enable_plane(int plane, int enable) +{ + dev_dbg(lcdc.fbdev->dev, + "plane %d enable %d update_mode %d ext_mode %d\n", + plane, enable, lcdc.update_mode, lcdc.ext_mode); + if (plane != OMAPFB_PLANE_GFX) + return -EINVAL; + + return 0; +} + +/* + * Configure the LCD DMA for a palette load operation and do the palette + * downloading synchronously. We don't use the frame+palette load mode of + * the controller, since the palette can always be downloaded separately. + */ +static void load_palette(void) +{ + u16 *palette; + + palette = (u16 *)lcdc.palette_virt; + + *(u16 *)palette &= 0x0fff; + *(u16 *)palette |= lcdc.palette_code; + + omap_set_lcd_dma_b1(lcdc.palette_phys, + lcdc.palette_size / 4 + 1, 1, OMAP_DMA_DATA_TYPE_S32); + + omap_set_lcd_dma_single_transfer(1); + omap_setup_lcd_dma(); + + init_completion(&lcdc.palette_load_complete); + enable_irqs(OMAP_LCDC_IRQ_LOADED_PALETTE); + set_load_mode(OMAP_LCDC_LOAD_PALETTE); + enable_controller(); + if (!wait_for_completion_timeout(&lcdc.palette_load_complete, + msecs_to_jiffies(500))) + dev_err(lcdc.fbdev->dev, "timeout waiting for FRAME DONE\n"); + /* The controller gets disabled in the irq handler */ + disable_irqs(OMAP_LCDC_IRQ_LOADED_PALETTE); + omap_stop_lcd_dma(); + + omap_set_lcd_dma_single_transfer(lcdc.ext_mode); +} + +/* Used only in internal controller mode */ +static int omap_lcdc_setcolreg(u_int regno, u16 red, u16 green, u16 blue, + u16 transp, int update_hw_pal) +{ + u16 *palette; + + if (lcdc.color_mode != OMAPFB_COLOR_CLUT_8BPP || regno > 255) + return -EINVAL; + + palette = (u16 *)lcdc.palette_virt; + + palette[regno] &= ~0x0fff; + palette[regno] |= ((red >> 12) << 8) | ((green >> 12) << 4 ) | + (blue >> 12); + + if (update_hw_pal) { + disable_controller(); + omap_stop_lcd_dma(); + load_palette(); + setup_lcd_dma(); + set_load_mode(OMAP_LCDC_LOAD_FRAME); + enable_controller(); + } + + return 0; +} + +static void calc_ck_div(int is_tft, int pck, int *pck_div) +{ + unsigned long lck; + + pck = max(1, pck); + lck = clk_get_rate(lcdc.lcd_ck); + *pck_div = (lck + pck - 1) / pck; + if (is_tft) + *pck_div = max(2, *pck_div); + else + *pck_div = max(3, *pck_div); + if (*pck_div > 255) { + /* FIXME: try to adjust logic clock divider as well */ + *pck_div = 255; + dev_warn(lcdc.fbdev->dev, "pixclock %d kHz too low.\n", + pck / 1000); + } +} + +static inline void setup_regs(void) +{ + u32 l; + struct lcd_panel *panel = lcdc.fbdev->panel; + int is_tft = panel->config & OMAP_LCDC_PANEL_TFT; + unsigned long lck; + int pcd; + + l = omap_readl(OMAP_LCDC_CONTROL); + l &= ~OMAP_LCDC_CTRL_LCD_TFT; + l |= is_tft ? OMAP_LCDC_CTRL_LCD_TFT : 0; +#ifdef CONFIG_MACH_OMAP_PALMTE +/* FIXME:if (machine_is_omap_palmte()) { */ + /* PalmTE uses alternate TFT setting in 8BPP mode */ + l |= (is_tft && panel->bpp == 8) ? 0x810000 : 0; +/* } */ +#endif + omap_writel(l, OMAP_LCDC_CONTROL); + + l = omap_readl(OMAP_LCDC_TIMING2); + l &= ~(((1 << 6) - 1) << 20); + l |= (panel->config & OMAP_LCDC_SIGNAL_MASK) << 20; + omap_writel(l, OMAP_LCDC_TIMING2); + + l = panel->x_res - 1; + l |= (panel->hsw - 1) << 10; + l |= (panel->hfp - 1) << 16; + l |= (panel->hbp - 1) << 24; + omap_writel(l, OMAP_LCDC_TIMING0); + + l = panel->y_res - 1; + l |= (panel->vsw - 1) << 10; + l |= panel->vfp << 16; + l |= panel->vbp << 24; + omap_writel(l, OMAP_LCDC_TIMING1); + + l = omap_readl(OMAP_LCDC_TIMING2); + l &= ~0xff; + + lck = clk_get_rate(lcdc.lcd_ck); + + if (!panel->pcd) + calc_ck_div(is_tft, panel->pixel_clock * 1000, &pcd); + else { + dev_warn(lcdc.fbdev->dev, + "Pixel clock divider value is obsolete.\n" + "Try to set pixel_clock to %lu and pcd to 0 " + "in drivers/video/omap/lcd_%s.c and submit a patch.\n", + lck / panel->pcd / 1000, panel->name); + + pcd = panel->pcd; + } + l |= pcd & 0xff; + l |= panel->acb << 8; + omap_writel(l, OMAP_LCDC_TIMING2); + + /* update panel info with the exact clock */ + panel->pixel_clock = lck / pcd / 1000; +} + +/* + * Configure the LCD controller, download the color palette and start a looped + * DMA transfer of the frame image data. Called only in internal + * controller mode. + */ +static int omap_lcdc_set_update_mode(enum omapfb_update_mode mode) +{ + int r = 0; + + if (mode != lcdc.update_mode) { + switch (mode) { + case OMAPFB_AUTO_UPDATE: + setup_regs(); + load_palette(); + + /* Setup and start LCD DMA */ + setup_lcd_dma(); + + set_load_mode(OMAP_LCDC_LOAD_FRAME); + enable_irqs(OMAP_LCDC_IRQ_DONE); + /* This will start the actual DMA transfer */ + enable_controller(); + lcdc.update_mode = mode; + break; + case OMAPFB_UPDATE_DISABLED: + disable_controller(); + omap_stop_lcd_dma(); + lcdc.update_mode = mode; + break; + default: + r = -EINVAL; + } + } + + return r; +} + +static enum omapfb_update_mode omap_lcdc_get_update_mode(void) +{ + return lcdc.update_mode; +} + +/* PM code called only in internal controller mode */ +static void omap_lcdc_suspend(void) +{ + omap_lcdc_set_update_mode(OMAPFB_UPDATE_DISABLED); +} + +static void omap_lcdc_resume(void) +{ + omap_lcdc_set_update_mode(OMAPFB_AUTO_UPDATE); +} + +static void omap_lcdc_get_caps(int plane, struct omapfb_caps *caps) +{ + return; +} + +int omap_lcdc_set_dma_callback(void (*callback)(void *data), void *data) +{ + BUG_ON(callback == NULL); + + if (lcdc.dma_callback) + return -EBUSY; + else { + lcdc.dma_callback = callback; + lcdc.dma_callback_data = data; + } + return 0; +} +EXPORT_SYMBOL(omap_lcdc_set_dma_callback); + +void omap_lcdc_free_dma_callback(void) +{ + lcdc.dma_callback = NULL; +} +EXPORT_SYMBOL(omap_lcdc_free_dma_callback); + +static void lcdc_dma_handler(u16 status, void *data) +{ + if (lcdc.dma_callback) + lcdc.dma_callback(lcdc.dma_callback_data); +} + +static int alloc_palette_ram(void) +{ + lcdc.palette_virt = dma_alloc_wc(lcdc.fbdev->dev, MAX_PALETTE_SIZE, + &lcdc.palette_phys, GFP_KERNEL); + if (lcdc.palette_virt == NULL) { + dev_err(lcdc.fbdev->dev, "failed to alloc palette memory\n"); + return -ENOMEM; + } + memset(lcdc.palette_virt, 0, MAX_PALETTE_SIZE); + + return 0; +} + +static void free_palette_ram(void) +{ + dma_free_wc(lcdc.fbdev->dev, MAX_PALETTE_SIZE, lcdc.palette_virt, + lcdc.palette_phys); +} + +static int alloc_fbmem(struct omapfb_mem_region *region) +{ + int bpp; + int frame_size; + struct lcd_panel *panel = lcdc.fbdev->panel; + + bpp = panel->bpp; + if (bpp == 12) + bpp = 16; + frame_size = PAGE_ALIGN(panel->x_res * bpp / 8 * panel->y_res); + if (region->size > frame_size) + frame_size = region->size; + lcdc.vram_size = frame_size; + lcdc.vram_virt = dma_alloc_wc(lcdc.fbdev->dev, lcdc.vram_size, + &lcdc.vram_phys, GFP_KERNEL); + if (lcdc.vram_virt == NULL) { + dev_err(lcdc.fbdev->dev, "unable to allocate FB DMA memory\n"); + return -ENOMEM; + } + region->size = frame_size; + region->paddr = lcdc.vram_phys; + region->vaddr = lcdc.vram_virt; + region->alloc = 1; + + memset(lcdc.vram_virt, 0, lcdc.vram_size); + + return 0; +} + +static void free_fbmem(void) +{ + dma_free_wc(lcdc.fbdev->dev, lcdc.vram_size, lcdc.vram_virt, + lcdc.vram_phys); +} + +static int setup_fbmem(struct omapfb_mem_desc *req_md) +{ + if (!req_md->region_cnt) { + dev_err(lcdc.fbdev->dev, "no memory regions defined\n"); + return -EINVAL; + } + + if (req_md->region_cnt > 1) { + dev_err(lcdc.fbdev->dev, "only one plane is supported\n"); + req_md->region_cnt = 1; + } + + return alloc_fbmem(&req_md->region[0]); +} + +static int omap_lcdc_init(struct omapfb_device *fbdev, int ext_mode, + struct omapfb_mem_desc *req_vram) +{ + int r; + u32 l; + int rate; + struct clk *tc_ck; + + lcdc.irq_mask = 0; + + lcdc.fbdev = fbdev; + lcdc.ext_mode = ext_mode; + + l = 0; + omap_writel(l, OMAP_LCDC_CONTROL); + + /* FIXME: + * According to errata some platforms have a clock rate limitiation + */ + lcdc.lcd_ck = clk_get(fbdev->dev, "lcd_ck"); + if (IS_ERR(lcdc.lcd_ck)) { + dev_err(fbdev->dev, "unable to access LCD clock\n"); + r = PTR_ERR(lcdc.lcd_ck); + goto fail0; + } + + tc_ck = clk_get(fbdev->dev, "tc_ck"); + if (IS_ERR(tc_ck)) { + dev_err(fbdev->dev, "unable to access TC clock\n"); + r = PTR_ERR(tc_ck); + goto fail1; + } + + rate = clk_get_rate(tc_ck); + clk_put(tc_ck); + + if (machine_is_ams_delta()) + rate /= 4; + if (machine_is_omap_h3()) + rate /= 3; + r = clk_set_rate(lcdc.lcd_ck, rate); + if (r) { + dev_err(fbdev->dev, "failed to adjust LCD rate\n"); + goto fail1; + } + clk_prepare_enable(lcdc.lcd_ck); + + r = request_irq(fbdev->int_irq, lcdc_irq_handler, 0, MODULE_NAME, fbdev); + if (r) { + dev_err(fbdev->dev, "unable to get IRQ\n"); + goto fail2; + } + + r = omap_request_lcd_dma(lcdc_dma_handler, NULL); + if (r) { + dev_err(fbdev->dev, "unable to get LCD DMA\n"); + goto fail3; + } + + omap_set_lcd_dma_single_transfer(ext_mode); + omap_set_lcd_dma_ext_controller(ext_mode); + + if (!ext_mode) + if ((r = alloc_palette_ram()) < 0) + goto fail4; + + if ((r = setup_fbmem(req_vram)) < 0) + goto fail5; + + pr_info("omapfb: LCDC initialized\n"); + + return 0; +fail5: + if (!ext_mode) + free_palette_ram(); +fail4: + omap_free_lcd_dma(); +fail3: + free_irq(fbdev->int_irq, lcdc.fbdev); +fail2: + clk_disable_unprepare(lcdc.lcd_ck); +fail1: + clk_put(lcdc.lcd_ck); +fail0: + return r; +} + +static void omap_lcdc_cleanup(void) +{ + if (!lcdc.ext_mode) + free_palette_ram(); + free_fbmem(); + omap_free_lcd_dma(); + free_irq(lcdc.fbdev->int_irq, lcdc.fbdev); + clk_disable_unprepare(lcdc.lcd_ck); + clk_put(lcdc.lcd_ck); +} + +const struct lcd_ctrl omap1_int_ctrl = { + .name = "internal", + .init = omap_lcdc_init, + .cleanup = omap_lcdc_cleanup, + .get_caps = omap_lcdc_get_caps, + .set_update_mode = omap_lcdc_set_update_mode, + .get_update_mode = omap_lcdc_get_update_mode, + .update_window = NULL, + .suspend = omap_lcdc_suspend, + .resume = omap_lcdc_resume, + .setup_plane = omap_lcdc_setup_plane, + .enable_plane = omap_lcdc_enable_plane, + .setcolreg = omap_lcdc_setcolreg, +}; |