amdisplay(4) drives the LCD controller in am335x SoCs (beaglebone black for us). Patch is unfinished but is further along than imxdisplay(4). (imx6q's display subsystem is enormously complicated and poorly documented; I intend to finish both but am working on this one for now).
Interestingly, the am335x SoC does not have a HDMI/DP/etc transmitter on silicon -- the BBB has its LCDC pins wired to a TDA19988 HDMI transmitter which is additionally backwired to one of the am335x's i2c ports: "nxp,tda998x" at iic0 addr 0x70 not configured Without a TDA19988 driver we are unable to probe for an attached display's EDID bits thus unable to tailor timing/videomode parameters on a per-display basis. I am working on such a driver but would like to ask developers if it would be worth it, or if there is more important armv7 work to be done elsewhere. Ian Index: sys/arch/armv7/conf/GENERIC =================================================================== RCS file: /cvs/src/sys/arch/armv7/conf/GENERIC,v retrieving revision 1.31 diff -u -p -r1.31 GENERIC --- sys/arch/armv7/conf/GENERIC 12 Jul 2016 19:17:49 -0000 1.31 +++ sys/arch/armv7/conf/GENERIC 6 Aug 2016 07:59:48 -0000 @@ -76,6 +76,8 @@ cpsw* at fdt? com* at fdt? # onboard uarts ommmc* at fdt? # SD/MMC card controller sdmmc* at ommmc? # SD/MMC bus +amdisplay* at fdt? # LCD controller +wsdisplay* at amdisplay? console ? ehci* at omap? # EHCI (shim) usb* at ehci? Index: sys/arch/armv7/omap/am335x_prcmreg.h =================================================================== RCS file: /cvs/src/sys/arch/armv7/omap/am335x_prcmreg.h,v retrieving revision 1.4 diff -u -p -r1.4 am335x_prcmreg.h --- sys/arch/armv7/omap/am335x_prcmreg.h 18 Mar 2014 07:34:17 -0000 1.4 +++ sys/arch/armv7/omap/am335x_prcmreg.h 6 Aug 2016 07:59:48 -0000 @@ -20,6 +20,7 @@ #define AM335X_CLKCTRL_MODULEMODE_MASK 0x00000003 #define PRCM_AM335X_CM_PER 0x0000 +#define PRCM_AM335X_LCDC_CLKCTRL 0x0018 #define PRCM_AM335X_USB0_CLKCTRL 0x001c #define PRCM_AM335X_TPTC0_CLKCTRL 0x0024 #define PRCM_AM335X_MMC0_CLKCTRL 0x003c Index: sys/arch/armv7/omap/amdisplay.c =================================================================== RCS file: sys/arch/armv7/omap/amdisplay.c diff -N sys/arch/armv7/omap/amdisplay.c --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ sys/arch/armv7/omap/amdisplay.c 6 Aug 2016 07:59:48 -0000 @@ -0,0 +1,371 @@ +/* + * Copyright (c) 2016 Ian Sutton <[email protected]> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <sys/param.h> +#include <sys/systm.h> + +#include <dev/cons.h> +#include <dev/wscons/wsconsio.h> +#include <dev/wscons/wsdisplayvar.h> +#include <dev/wscons/wscons_callbacks.h> +#include <dev/rasops/rasops.h> + +#include <dev/ofw/openfirm.h> +#include <dev/ofw/fdt.h> +#include <machine/fdt.h> + +#include <armv7/omap/prcmvar.h> + +/* register offsets */ +#define AMDISPLAY_PID 0x00 +#define AMDISPLAY_CTRL 0x04 +#define AMDISPLAY_CTRL_CLKDIV_MASK (0xFF << 8) +#define AMDISPLAY_CTRL_MODESEL_MASK (1 << 0) +#define AMDISPLAY_RASTER_CTRL 0x28 +#define AMDISPLAY_RASTER_CTRL_TFT24UNPACKED_MASK (1 << 26) +#define AMDISPLAY_RASTER_CTRL_TFT24_MASK (1 << 25) +#define AMDISPLAY_RASTER_CTRL_LCDTFT_MASK (1 << 7) +#define AMDISPLAY_RASTER_CTRL_LCDEN_MASK (1 << 0) +#define AMDISPLAY_RASTER_TIMING_0 0x2C +#define AMDISPLAY_RASTER_TIMING_1 0x30 +#define AMDISPLAY_RASTER_TIMING_2 0x34 +#define AMDISPLAY_RASTER_SUBPANEL 0x38 +#define AMDISPLAY_RASTER_SUBPANEL_2 0x3C +#define AMDISPLAY_LCDDMA_CTRL 0x40 +#define AMDISPLAY_LCDDMA_FB0_BASE 0x44 +#define AMDISPLAY_LCDDMA_FB0_CEILING 0x48 +#define AMDISPLAY_LCDDMA_FB1_BASE 0x4C +#define AMDISPLAY_LCDDMA_FB1_CEILING 0x50 +#define AMDISPLAY_SYSCONFIG 0x54 +#define AMDISPLAY_SYSCONFIG_STANDBYMODE_MASK (3 << 4) +#define AMDISPLAY_SYSCONFIG_IDLEMODE_MASK (3 << 2) +#define AMDISPLAY_SYSCONFIG_STANDBYMODE_SHAMT 4 +#define AMDISPLAY_SYSCONFIG_IDLEMODE_SHAMT 2 +#define AMDISPLAY_IRQSTATUS_RAW 0x58 +#define AMDISPLAY_IRQSTATUS 0x5C +#define AMDISPLAY_IRQENABLE_SET 0x60 +#define AMDISPLAY_IRQENABLE_CLEAR 0x64 +#define AMDISPLAY_CLKC_ENABLE 0x6C +#define AMDISPLAY_CLKC_RESET 0x70 + +/* intr. masks */ +#define AMDISPLAY_IRQ_EOF1 (1 << 9) +#define AMDISPLAY_IRQ_EOF0 (1 << 8) +#define AMDISPLAY_IRQ_PL (1 << 6) +#define AMDISPLAY_IRQ_FUF (1 << 5) +#define AMDISPLAY_IRQ_ACB (1 << 3) +#define AMDISPLAY_IRQ_SYNC (1 << 2) +#define AMDISPLAY_IRQ_RR_DONE (1 << 1) +#define AMDISPLAY_IRQ_DONE (1 << 0) + +#define DEVNAME(_s) ((_s)->sc_dev.dv_xname) + +#define HREAD4(sc, reg) \ + (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))) +#define HWRITE4(sc, reg, val) \ + bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val)) +#define HSET4(sc, reg, bits) \ + HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits)) +#define HCLR4(sc, reg, bits) \ + HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits)) + +struct amdisplay_softc { + struct device sc_dev; + bus_space_tag_t sc_iot; + bus_space_handle_t sc_ioh; + bus_dma_tag_t sc_dmat; + void *sc_ih; + + struct amdisplay_panel_data *sc_active; + bus_dmamap_t sc_fb_dma; + bus_dma_segment_t sc_fb_dma_segs[1]; + int sc_fb_dma_nsegs; + size_t sc_fb_size; + caddr_t sc_fb; + int depth; + struct rasops_info ro; +}; + +struct amdisplay_panel_data { + int width; + int height; + int horiz_sync_width; + int horiz_front_porch; + int horiz_back_porch; + int vert_sync_width; + int vert_front_porch; + int vert_back_porch; + int panel_flags; + int sync; + int depth; +#define PANEL_SYNC_H_ACTIVE_HIGH 1 +#define PANEL_SYNC_V_ACTIVE_HIGH 2 + int linebytes; +}; + +/* we use this dummy device and hope it applies as the am335x has no on-chip + * method of determining peripheral display capabilities. the beaglebone black + * has the LCDC pins hardwired to a TDA19988 which sits between LCDC & HDMI + * connector and is also wired to an i2c port over which it sends EDID + * information needed to properly configure display geometry on a per-panel + * basis XXX */ +struct amdisplay_panel_data dummy = { + 1280, + 720, + 44, 88, 148, + 5, 4, 36, + 0, + 0, + 24, + 2560 +}; + +struct wsscreen_descr amdisplay_stdscreen = { + "std" +}; + +const struct wsscreen_descr *amdisplay_scrlist[] = { + &amdisplay_stdscreen, +}; + +struct wsscreen_list amdisplay_screenlist = { + nitems(amdisplay_scrlist), amdisplay_scrlist +}; + +int amdisplay_match(struct device *, void *, void *); +void amdisplay_attach(struct device *, struct device *, void *); +int amdisplay_activate(struct device *, int); +int amdisplay_intr(void *); + +int amdisplay_ioctl(void *, u_long, caddr_t, int, struct proc *); +int amdisplay_alloc_screen(void *, const struct wsscreen_descr *, + void **, int *, int *, long *); +void amdisplay_free_screen(void *, void *); +int amdisplay_show_screen(void *, void *, int, + void (*)(void *, int, int), void *); +void amdisplay_doswitch(void *, void *); +int amdisplay_load_font(void *, void *, struct wsdisplay_font *); +int amdisplay_list_font(void *, struct wsdisplay_font *); +int amdisplay_getchar(void *, int, int, struct wsdisplay_charcell *); +void amdisplay_burner(void *, u_int, u_int); +paddr_t amdisplay_mmap(void *, off_t, int); + +void amdisplay_setup_rasops(struct amdisplay_softc *); +int amdisplay_setup_dma(struct amdisplay_softc *, struct amdisplay_panel_data *); + +struct wsdisplay_accessops amdisplay_accessops = { + .ioctl = amdisplay_ioctl, + .mmap = amdisplay_mmap, + .alloc_screen = amdisplay_alloc_screen, + .free_screen = amdisplay_free_screen, + .show_screen = amdisplay_show_screen, + .getchar = amdisplay_getchar, + .load_font = amdisplay_load_font, + .list_font = amdisplay_list_font, + .burn_screen = amdisplay_burner +}; + +struct cfattach amdisplay_ca = { + sizeof(struct amdisplay_softc), amdisplay_match, amdisplay_attach +}; + +struct cfdriver amdisplay_cd = { + NULL, "amdisplay", DV_DULL +}; + +int +amdisplay_match(struct device *parent, void *v, void *aux) +{ + struct fdt_attach_args *faa = aux; + return OF_is_compatible(faa->fa_node, "ti,am33xx-tilcdc"); +} + +void +amdisplay_attach(struct device *parent, struct device *self, void *args) +{ + struct amdisplay_softc *sc = (struct amdisplay_softc *) self; + struct fdt_attach_args *faa = args; + struct wsemuldisplaydev_attach_args wsaa; + + uint32_t irq, reg; + + sc->sc_iot = faa->fa_iot; + sc->sc_dmat = faa->fa_dmat; + if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr, + faa->fa_reg[0].size, 0, &sc->sc_ioh)) + panic("%s: bus_space_map failed!", __func__); + + irq = faa->fa_intr[0]; + + prcm_enablemodule(PRCM_LCDC); + + /* force ourselves out of standby/idle states */ + reg = HREAD4(sc, AMDISPLAY_SYSCONFIG); + reg &= ~(AMDISPLAY_SYSCONFIG_STANDBYMODE_MASK | AMDISPLAY_SYSCONFIG_IDLEMODE_MASK); + reg |= (1 << AMDISPLAY_SYSCONFIG_STANDBYMODE_SHAMT); + reg |= (1 << AMDISPLAY_SYSCONFIG_IDLEMODE_SHAMT); + HWRITE4(sc, AMDISPLAY_SYSCONFIG, reg); + + sc->sc_ih = arm_intr_establish(irq, IPL_BIO, amdisplay_intr, sc, DEVNAME(sc)); + + printf("\n"); + + /* allocate DMA-able memory for framebuffer */ + if (amdisplay_setup_dma(sc, &dummy)) { + printf("%s: could not create framebuffer!\n", DEVNAME(sc)); + return; + } + + amdisplay_setup_rasops(sc); + + /* set raster mode */ + HSET4(sc, AMDISPLAY_CTRL, AMDISPLAY_CTRL_MODESEL_MASK); + + /* enable all intrs. */ + reg = 0; + reg |= (AMDISPLAY_IRQ_EOF1 | AMDISPLAY_IRQ_EOF0 | AMDISPLAY_IRQ_PL | + AMDISPLAY_IRQ_FUF | AMDISPLAY_IRQ_ACB | AMDISPLAY_IRQ_SYNC | + AMDISPLAY_IRQ_RR_DONE | AMDISPLAY_IRQ_DONE); + HWRITE4(sc, AMDISPLAY_IRQENABLE_SET, reg); + + wsaa.console = 0; + wsaa.scrdata = &amdisplay_screenlist; + wsaa.accessops = &amdisplay_accessops; + wsaa.accesscookie = sc; + wsaa.defaultscreens = 0; + + printf("%s: %dx%d\n", sc->sc_dev.dv_xname, sc->ro.ri_width, sc->ro.ri_height); + + //config_found(self, &wsaa, wsemuldisplaydevprint); +} + +void +amdisplay_setup_rasops(struct amdisplay_softc *sc) +{ + sc->ro.ri_depth = sc->sc_active->depth; + sc->ro.ri_width = sc->sc_active->width; + sc->ro.ri_height = sc->sc_active->height; + sc->ro.ri_stride = sc->sc_active->width * sc->sc_active->depth; + sc->ro.ri_bits = (void *) sc->sc_fb; + + rasops_init(&(sc->ro), 100, 100); +} + +int +amdisplay_setup_dma(struct amdisplay_softc *sc, struct amdisplay_panel_data *p) +{ + size_t fb_size; + int dma_flags = (cold ? BUS_DMA_NOWAIT : BUS_DMA_WAITOK); + + //fb_size = p->width * p->height * p->depth; + fb_size = roundup(p->height * p->linebytes, 16); + if(bus_dmamap_create(sc->sc_dmat, fb_size, 1, fb_size, 0, dma_flags, + &(sc->sc_fb_dma))) + return -1; + + if(bus_dmamem_alloc(sc->sc_dmat, fb_size, 0x100000, 0, sc->sc_fb_dma_segs, + 1, &(sc->sc_fb_dma_nsegs), dma_flags)) /* XXX check alignment */ + return -1; + + sc->sc_fb = NULL; + if(bus_dmamem_map(sc->sc_dmat, sc->sc_fb_dma_segs, sc->sc_fb_dma_nsegs, + fb_size, &(sc->sc_fb), dma_flags)) + return -1; + + sc->sc_active = p; + return 0; +} + +int +amdisplay_intr(void *arg) +{ + return 0; +} + +int +amdisplay_ioctl(void *sconf, u_long cmd, caddr_t data, int flat, struct proc *p) +{ + return -1; +} + +paddr_t +amdisplay_mmap(void *sconf, off_t off, int prot) +{ + return -1; +} + +int +amdisplay_alloc_screen(void *sconf, const struct wsscreen_descr *type, + void **cookiep, int *curxp, int *curyp, long *attrp) +{ + struct amdisplay_softc *sc = sconf; + struct rasops_info *ri = &(sc->ro); + + return rasops_alloc_screen(ri, cookiep, curxp, curyp, attrp); +} + +void +amdisplay_free_screen(void *sconf, void *cookie) +{ + struct amdisplay_softc *sc = sconf; + struct rasops_info *ri = &(sc->ro); + + return rasops_free_screen(ri, cookie); +} + +int +amdisplay_show_screen(void *sconf, void *cookie, int waitok, + void (*cb)(void *, int, int), void *cbarg) +{ + return (0); +} + +void +amdisplay_doswitch(void *v, void *dummy) +{ +} + +int +amdisplay_getchar(void *sconf, int row, int col, struct wsdisplay_charcell *cell) +{ + struct amdisplay_softc *sc = sconf; + struct rasops_info *ri = &(sc->ro); + + return rasops_getchar(ri, row, col, cell); +} + +int +amdisplay_load_font(void *sconf, void *cookie, struct wsdisplay_font *font) +{ + struct amdisplay_softc *sc = sconf; + struct rasops_info *ri = &(sc->ro); + + return rasops_load_font(ri, cookie, font); +} + +int +amdisplay_list_font(void *sconf, struct wsdisplay_font *font) +{ + struct amdisplay_softc *sc = sconf; + struct rasops_info *ri = &(sc->ro); + + return rasops_list_font(ri, font); +} + +void +amdisplay_burner(void *sconf, u_int on, u_int flags) +{ +} Index: sys/arch/armv7/omap/files.omap =================================================================== RCS file: /cvs/src/sys/arch/armv7/omap/files.omap,v retrieving revision 1.13 diff -u -p -r1.13 files.omap --- sys/arch/armv7/omap/files.omap 26 Jun 2016 09:06:35 -0000 1.13 +++ sys/arch/armv7/omap/files.omap 6 Aug 2016 07:59:48 -0000 @@ -81,6 +81,11 @@ device omdisplay: wsemuldisplaydev, raso attach omdisplay at omap file arch/armv7/omap/omdisplay.c omdisplay +# am335x LCD frame buffer +device amdisplay: wsemuldisplaydev, rasops16 +attach amdisplay at fdt +file arch/armv7/omap/amdisplay.c amdisplay + # MCSPI - spi device mcspi attach mcspi at omap Index: sys/arch/armv7/omap/prcm.c =================================================================== RCS file: /cvs/src/sys/arch/armv7/omap/prcm.c,v retrieving revision 1.11 diff -u -p -r1.11 prcm.c --- sys/arch/armv7/omap/prcm.c 18 Jul 2016 15:03:01 -0000 1.11 +++ sys/arch/armv7/omap/prcm.c 6 Aug 2016 07:59:48 -0000 @@ -336,6 +336,8 @@ prcm_am335x_clkctrl(int mod) return PRCM_AM335X_I2C1_CLKCTRL; case PRCM_I2C2: return PRCM_AM335X_I2C2_CLKCTRL; + case PRCM_LCDC: + return PRCM_AM335X_LCDC_CLKCTRL; default: panic("%s: module not found\n", __func__); } Index: sys/arch/armv7/omap/prcmvar.h =================================================================== RCS file: /cvs/src/sys/arch/armv7/omap/prcmvar.h,v retrieving revision 1.6 diff -u -p -r1.6 prcmvar.h --- sys/arch/armv7/omap/prcmvar.h 18 Jul 2016 15:03:01 -0000 1.6 +++ sys/arch/armv7/omap/prcmvar.h 6 Aug 2016 07:59:48 -0000 @@ -54,6 +54,7 @@ enum PRCM_MODULES { PRCM_I2C1, PRCM_I2C2, PRCM_I2C3, + PRCM_LCDC, }; #define PRCM_REG_MAX 6
