/* * Versatile board support using the device tree * * Copyright (C) 2010 Secret Lab Technologies Ltd. * Copyright (C) 2009 Jeremy Kerr <jeremy.kerr@canonical.com> * Copyright (C) 2004 ARM Limited * Copyright (C) 2000 Deep Blue Solutions Ltd * * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/init.h> #include <linux/io.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/of_platform.h> #include <linux/slab.h> #include <linux/amba/bus.h> #include <linux/amba/clcd.h> #include <linux/platform_data/video-clcd-versatile.h> #include <linux/amba/mmci.h> #include <asm/mach-types.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> /* macro to get at MMIO space when running virtually */ #define IO_ADDRESS(x) (((x) & 0x0fffffff) + (((x) >> 4) & 0x0f000000) + 0xf0000000) #define __io_address(n) ((void __iomem __force *)IO_ADDRESS(n)) /* * ------------------------------------------------------------------------ * Versatile Registers * ------------------------------------------------------------------------ */ #define VERSATILE_SYS_PCICTL_OFFSET 0x44 #define VERSATILE_SYS_MCI_OFFSET 0x48 #define VERSATILE_SYS_CLCD_OFFSET 0x50 /* * VERSATILE peripheral addresses */ #define VERSATILE_MMCI0_BASE 0x10005000 /* MMC interface */ #define VERSATILE_MMCI1_BASE 0x1000B000 /* MMC Interface */ #define VERSATILE_CLCD_BASE 0x10120000 /* CLCD */ #define VERSATILE_SCTL_BASE 0x101E0000 /* System controller */ #define VERSATILE_IB2_BASE 0x24000000 /* IB2 module */ #define VERSATILE_IB2_CTL_BASE (VERSATILE_IB2_BASE + 0x03000000) /* * System controller bit assignment */ #define VERSATILE_REFCLK 0 #define VERSATILE_TIMCLK 1 #define VERSATILE_TIMER1_EnSel 15 #define VERSATILE_TIMER2_EnSel 17 #define VERSATILE_TIMER3_EnSel 19 #define VERSATILE_TIMER4_EnSel 21 static void __iomem *versatile_sys_base; static void __iomem *versatile_ib2_ctrl; unsigned int mmc_status(struct device *dev) { struct amba_device *adev = container_of(dev, struct amba_device, dev); u32 mask; if (adev->res.start == VERSATILE_MMCI0_BASE) mask = 1; else mask = 2; return readl(versatile_sys_base + VERSATILE_SYS_MCI_OFFSET) & mask; } static struct mmci_platform_data mmc0_plat_data = { .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34, .status = mmc_status, .gpio_wp = -1, .gpio_cd = -1, }; static struct mmci_platform_data mmc1_plat_data = { .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34, .status = mmc_status, .gpio_wp = -1, .gpio_cd = -1, }; /* * CLCD support. */ #define SYS_CLCD_MODE_MASK (3 << 0) #define SYS_CLCD_MODE_888 (0 << 0) #define SYS_CLCD_MODE_5551 (1 << 0) #define SYS_CLCD_MODE_565_RLSB (2 << 0) #define SYS_CLCD_MODE_565_BLSB (3 << 0) #define SYS_CLCD_NLCDIOON (1 << 2) #define SYS_CLCD_VDDPOSSWITCH (1 << 3) #define SYS_CLCD_PWR3V5SWITCH (1 << 4) #define SYS_CLCD_ID_MASK (0x1f << 8) #define SYS_CLCD_ID_SANYO_3_8 (0x00 << 8) #define SYS_CLCD_ID_UNKNOWN_8_4 (0x01 << 8) #define SYS_CLCD_ID_EPSON_2_2 (0x02 << 8) #define SYS_CLCD_ID_SANYO_2_5 (0x07 << 8) #define SYS_CLCD_ID_VGA (0x1f << 8) static bool is_sanyo_2_5_lcd; /* * Disable all display connectors on the interface module. */ static void versatile_clcd_disable(struct clcd_fb *fb) { void __iomem *sys_clcd = versatile_sys_base + VERSATILE_SYS_CLCD_OFFSET; u32 val; val = readl(sys_clcd); val &= ~SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH; writel(val, sys_clcd); /* * If the LCD is Sanyo 2x5 in on the IB2 board, turn the back-light off */ if (of_machine_is_compatible("arm,versatile-ab") && is_sanyo_2_5_lcd) { unsigned long ctrl; ctrl = readl(versatile_ib2_ctrl); ctrl &= ~0x01; writel(ctrl, versatile_ib2_ctrl); } } /* * Enable the relevant connector on the interface module. */ static void versatile_clcd_enable(struct clcd_fb *fb) { struct fb_var_screeninfo *var = &fb->fb.var; void __iomem *sys_clcd = versatile_sys_base + VERSATILE_SYS_CLCD_OFFSET; u32 val; val = readl(sys_clcd); val &= ~SYS_CLCD_MODE_MASK; switch (var->green.length) { case 5: val |= SYS_CLCD_MODE_5551; break; case 6: if (var->red.offset == 0) val |= SYS_CLCD_MODE_565_RLSB; else val |= SYS_CLCD_MODE_565_BLSB; break; case 8: val |= SYS_CLCD_MODE_888; break; } /* * Set the MUX */ writel(val, sys_clcd); /* * And now enable the PSUs */ val |= SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH; writel(val, sys_clcd); /* * If the LCD is Sanyo 2x5 in on the IB2 board, turn the back-light on */ if (of_machine_is_compatible("arm,versatile-ab") && is_sanyo_2_5_lcd) { unsigned long ctrl; ctrl = readl(versatile_ib2_ctrl); ctrl |= 0x01; writel(ctrl, versatile_ib2_ctrl); } } /* * Detect which LCD panel is connected, and return the appropriate * clcd_panel structure. Note: we do not have any information on * the required timings for the 8.4in panel, so we presently assume * VGA timings. */ static int versatile_clcd_setup(struct clcd_fb *fb) { void __iomem *sys_clcd = versatile_sys_base + VERSATILE_SYS_CLCD_OFFSET; const char *panel_name; u32 val; is_sanyo_2_5_lcd = false; val = readl(sys_clcd) & SYS_CLCD_ID_MASK; if (val == SYS_CLCD_ID_SANYO_3_8) panel_name = "Sanyo TM38QV67A02A"; else if (val == SYS_CLCD_ID_SANYO_2_5) { panel_name = "Sanyo QVGA Portrait"; is_sanyo_2_5_lcd = true; } else if (val == SYS_CLCD_ID_EPSON_2_2) panel_name = "Epson L2F50113T00"; else if (val == SYS_CLCD_ID_VGA) panel_name = "VGA"; else { printk(KERN_ERR "CLCD: unknown LCD panel ID 0x%08x, using VGA\n", val); panel_name = "VGA"; } fb->panel = versatile_clcd_get_panel(panel_name); if (!fb->panel) return -EINVAL; return versatile_clcd_setup_dma(fb, SZ_1M); } static void versatile_clcd_decode(struct clcd_fb *fb, struct clcd_regs *regs) { clcdfb_decode(fb, regs); /* Always clear BGR for RGB565: we do the routing externally */ if (fb->fb.var.green.length == 6) regs->cntl &= ~CNTL_BGR; } static struct clcd_board clcd_plat_data = { .name = "Versatile", .caps = CLCD_CAP_5551 | CLCD_CAP_565 | CLCD_CAP_888, .check = clcdfb_check, .decode = versatile_clcd_decode, .disable = versatile_clcd_disable, .enable = versatile_clcd_enable, .setup = versatile_clcd_setup, .mmap = versatile_clcd_mmap_dma, .remove = versatile_clcd_remove_dma, }; /* * Lookup table for attaching a specific name and platform_data pointer to * devices as they get created by of_platform_populate(). Ideally this table * would not exist, but the current clock implementation depends on some devices * having a specific name. */ struct of_dev_auxdata versatile_auxdata_lookup[] __initdata = { OF_DEV_AUXDATA("arm,primecell", VERSATILE_MMCI0_BASE, "fpga:05", &mmc0_plat_data), OF_DEV_AUXDATA("arm,primecell", VERSATILE_MMCI1_BASE, "fpga:0b", &mmc1_plat_data), OF_DEV_AUXDATA("arm,primecell", VERSATILE_CLCD_BASE, "dev:20", &clcd_plat_data), {} }; static struct map_desc versatile_io_desc[] __initdata __maybe_unused = { { .virtual = IO_ADDRESS(VERSATILE_SCTL_BASE), .pfn = __phys_to_pfn(VERSATILE_SCTL_BASE), .length = SZ_4K * 9, .type = MT_DEVICE } }; static void __init versatile_map_io(void) { debug_ll_io_init(); iotable_init(versatile_io_desc, ARRAY_SIZE(versatile_io_desc)); } static void __init versatile_init_early(void) { u32 val; /* * set clock frequency: * VERSATILE_REFCLK is 32KHz * VERSATILE_TIMCLK is 1MHz */ val = readl(__io_address(VERSATILE_SCTL_BASE)); writel((VERSATILE_TIMCLK << VERSATILE_TIMER1_EnSel) | (VERSATILE_TIMCLK << VERSATILE_TIMER2_EnSel) | (VERSATILE_TIMCLK << VERSATILE_TIMER3_EnSel) | (VERSATILE_TIMCLK << VERSATILE_TIMER4_EnSel) | val, __io_address(VERSATILE_SCTL_BASE)); } static void __init versatile_dt_pci_init(void) { u32 val; struct device_node *np; struct property *newprop; np = of_find_compatible_node(NULL, NULL, "arm,versatile-pci"); if (!np) return; /* Check if PCI backplane is detected */ val = readl(versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET); if (val & 1) { /* * Enable PCI accesses. Note that the documentaton is * inconsistent whether or not this is needed, but the old * driver had it so we will keep it. */ writel(1, versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET); return; } newprop = kzalloc(sizeof(*newprop), GFP_KERNEL); if (!newprop) return; newprop->name = kstrdup("status", GFP_KERNEL); newprop->value = kstrdup("disabled", GFP_KERNEL); newprop->length = sizeof("disabled"); of_update_property(np, newprop); pr_info("Not plugged into PCI backplane!\n"); } static void __init versatile_dt_init(void) { struct device_node *np; np = of_find_compatible_node(NULL, NULL, "arm,core-module-versatile"); if (np) versatile_sys_base = of_iomap(np, 0); WARN_ON(!versatile_sys_base); versatile_ib2_ctrl = ioremap(VERSATILE_IB2_CTL_BASE, SZ_4K); versatile_dt_pci_init(); of_platform_default_populate(NULL, versatile_auxdata_lookup, NULL); } static const char *const versatile_dt_match[] __initconst = { "arm,versatile-ab", "arm,versatile-pb", NULL, }; DT_MACHINE_START(VERSATILE_PB, "ARM-Versatile (Device Tree Support)") .map_io = versatile_map_io, .init_early = versatile_init_early, .init_machine = versatile_dt_init, .dt_compat = versatile_dt_match, MACHINE_END