bbde6ebae6
In usb_musb_pm_init, we attempt to access an MUSB register when the i-clock may not be on, or the module is otherwise not accessible. We need to either: - enable the clock before this access, or - remove this code and move it to the bootloader, or - enable the clock in the bootloader If we enable the clock in the bootloader, we might as well add the workaround in the bootloader itself. This code will anyway be changed once hwmod is in place, so remove it for now This allows us to boot the kernel on certain OMAP3 boards with a bootloader that doesn't enable this clock. Without this, we will need to upgrade the bootloaders on these boards. Signed-off-by: Anand Gadiyar <gadiyar@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
174 lines
3.7 KiB
C
174 lines
3.7 KiB
C
/*
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* linux/arch/arm/mach-omap2/usb-musb.c
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*
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* This file will contain the board specific details for the
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* MENTOR USB OTG controller on OMAP3430
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*
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* Copyright (C) 2007-2008 Texas Instruments
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* Copyright (C) 2008 Nokia Corporation
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* Author: Vikram Pandita
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*
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* Generalization by:
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* Felipe Balbi <felipe.balbi@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/usb/musb.h>
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#include <mach/hardware.h>
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#include <mach/irqs.h>
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#include <mach/mux.h>
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#include <mach/usb.h>
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#ifdef CONFIG_USB_MUSB_SOC
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static struct resource musb_resources[] = {
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[0] = { /* start and end set dynamically */
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.flags = IORESOURCE_MEM,
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},
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[1] = { /* general IRQ */
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.start = INT_243X_HS_USB_MC,
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.flags = IORESOURCE_IRQ,
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},
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[2] = { /* DMA IRQ */
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.start = INT_243X_HS_USB_DMA,
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.flags = IORESOURCE_IRQ,
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},
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};
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static int clk_on;
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static int musb_set_clock(struct clk *clk, int state)
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{
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if (state) {
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if (clk_on > 0)
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return -ENODEV;
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clk_enable(clk);
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clk_on = 1;
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} else {
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if (clk_on == 0)
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return -ENODEV;
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clk_disable(clk);
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clk_on = 0;
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}
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return 0;
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}
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static struct musb_hdrc_eps_bits musb_eps[] = {
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{ "ep1_tx", 10, },
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{ "ep1_rx", 10, },
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{ "ep2_tx", 9, },
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{ "ep2_rx", 9, },
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{ "ep3_tx", 3, },
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{ "ep3_rx", 3, },
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{ "ep4_tx", 3, },
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{ "ep4_rx", 3, },
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{ "ep5_tx", 3, },
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{ "ep5_rx", 3, },
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{ "ep6_tx", 3, },
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{ "ep6_rx", 3, },
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{ "ep7_tx", 3, },
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{ "ep7_rx", 3, },
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{ "ep8_tx", 2, },
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{ "ep8_rx", 2, },
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{ "ep9_tx", 2, },
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{ "ep9_rx", 2, },
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{ "ep10_tx", 2, },
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{ "ep10_rx", 2, },
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{ "ep11_tx", 2, },
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{ "ep11_rx", 2, },
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{ "ep12_tx", 2, },
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{ "ep12_rx", 2, },
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{ "ep13_tx", 2, },
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{ "ep13_rx", 2, },
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{ "ep14_tx", 2, },
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{ "ep14_rx", 2, },
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{ "ep15_tx", 2, },
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{ "ep15_rx", 2, },
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};
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static struct musb_hdrc_config musb_config = {
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.multipoint = 1,
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.dyn_fifo = 1,
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.soft_con = 1,
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.dma = 1,
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.num_eps = 16,
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.dma_channels = 7,
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.dma_req_chan = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3),
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.ram_bits = 12,
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.eps_bits = musb_eps,
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};
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static struct musb_hdrc_platform_data musb_plat = {
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#ifdef CONFIG_USB_MUSB_OTG
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.mode = MUSB_OTG,
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#elif defined(CONFIG_USB_MUSB_HDRC_HCD)
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.mode = MUSB_HOST,
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#elif defined(CONFIG_USB_GADGET_MUSB_HDRC)
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.mode = MUSB_PERIPHERAL,
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#endif
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/* .clock is set dynamically */
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.set_clock = musb_set_clock,
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.config = &musb_config,
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/* REVISIT charge pump on TWL4030 can supply up to
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* 100 mA ... but this value is board-specific, like
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* "mode", and should be passed to usb_musb_init().
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*/
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.power = 50, /* up to 100 mA */
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};
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static u64 musb_dmamask = DMA_BIT_MASK(32);
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static struct platform_device musb_device = {
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.name = "musb_hdrc",
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.id = -1,
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.dev = {
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.dma_mask = &musb_dmamask,
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.coherent_dma_mask = DMA_BIT_MASK(32),
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.platform_data = &musb_plat,
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},
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.num_resources = ARRAY_SIZE(musb_resources),
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.resource = musb_resources,
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};
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void __init usb_musb_init(void)
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{
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if (cpu_is_omap243x())
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musb_resources[0].start = OMAP243X_HS_BASE;
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else
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musb_resources[0].start = OMAP34XX_HSUSB_OTG_BASE;
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musb_resources[0].end = musb_resources[0].start + SZ_8K - 1;
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/*
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* REVISIT: This line can be removed once all the platforms using
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* musb_core.c have been converted to use use clkdev.
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*/
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musb_plat.clock = "ick";
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if (platform_device_register(&musb_device) < 0) {
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printk(KERN_ERR "Unable to register HS-USB (MUSB) device\n");
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return;
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}
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}
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#else
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void __init usb_musb_init(void)
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{
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}
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#endif /* CONFIG_USB_MUSB_SOC */
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