139 lines
4.5 KiB
C
139 lines
4.5 KiB
C
/*
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* ARC HSDK Platform support code
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*
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* Copyright (C) 2017 Synopsys, Inc. (www.synopsys.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/init.h>
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#include <linux/smp.h>
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#include <asm/arcregs.h>
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#include <asm/io.h>
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#include <asm/mach_desc.h>
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#define ARC_CCM_UNUSED_ADDR 0x60000000
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static void __init hsdk_init_per_cpu(unsigned int cpu)
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{
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/*
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* By default ICCM is mapped to 0x7z while this area is used for
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* kernel virtual mappings, so move it to currently unused area.
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*/
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if (cpuinfo_arc700[cpu].iccm.sz)
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write_aux_reg(ARC_REG_AUX_ICCM, ARC_CCM_UNUSED_ADDR);
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/*
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* By default DCCM is mapped to 0x8z while this area is used by kernel,
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* so move it to currently unused area.
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*/
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if (cpuinfo_arc700[cpu].dccm.sz)
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write_aux_reg(ARC_REG_AUX_DCCM, ARC_CCM_UNUSED_ADDR);
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}
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#define ARC_PERIPHERAL_BASE 0xf0000000
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#define CREG_BASE (ARC_PERIPHERAL_BASE + 0x1000)
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#define CREG_PAE (CREG_BASE + 0x180)
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#define CREG_PAE_UPDATE (CREG_BASE + 0x194)
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#define SDIO_BASE (ARC_PERIPHERAL_BASE + 0xA000)
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#define SDIO_UHS_REG_EXT (SDIO_BASE + 0x108)
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#define SDIO_UHS_REG_EXT_DIV_2 (2 << 30)
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#define HSDK_GPIO_INTC (ARC_PERIPHERAL_BASE + 0x3000)
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static void __init hsdk_enable_gpio_intc_wire(void)
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{
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/*
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* Peripherals on CPU Card are wired to cpu intc via intermediate
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* DW APB GPIO blocks (mainly for debouncing)
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*
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* ---------------------
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* | snps,archs-intc |
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* ---------------------
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* |
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* ----------------------
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* | snps,archs-idu-intc |
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* ----------------------
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* | | | | |
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* | [eth] [USB] [... other peripherals]
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* |
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* -------------------
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* | snps,dw-apb-intc |
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* -------------------
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* | | | |
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* [Bt] [HAPS] [... other peripherals]
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*
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* Current implementation of "irq-dw-apb-ictl" driver doesn't work well
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* with stacked INTCs. In particular problem happens if its master INTC
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* not yet instantiated. See discussion here -
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* https://lkml.org/lkml/2015/3/4/755
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*
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* So setup the first gpio block as a passive pass thru and hide it from
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* DT hardware topology - connect intc directly to cpu intc
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* The GPIO "wire" needs to be init nevertheless (here)
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*
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* One side adv is that peripheral interrupt handling avoids one nested
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* intc ISR hop
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*
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* According to HSDK User's Manual [1], "Table 2 Interrupt Mapping"
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* we have the following GPIO input lines used as sources of interrupt:
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* - GPIO[0] - Bluetooth interrupt of RS9113 module
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* - GPIO[2] - HAPS interrupt (on HapsTrak 3 connector)
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* - GPIO[3] - Audio codec (MAX9880A) interrupt
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* - GPIO[8-23] - Available on Arduino and PMOD_x headers
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* For now there's no use of Arduino and PMOD_x headers in Linux
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* use-case so we only enable lines 0, 2 and 3.
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*
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* [1] https://github.com/foss-for-synopsys-dwc-arc-processors/ARC-Development-Systems-Forum/wiki/docs/ARC_HSDK_User_Guide.pdf
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*/
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#define GPIO_INTEN (HSDK_GPIO_INTC + 0x30)
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#define GPIO_INTMASK (HSDK_GPIO_INTC + 0x34)
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#define GPIO_INTTYPE_LEVEL (HSDK_GPIO_INTC + 0x38)
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#define GPIO_INT_POLARITY (HSDK_GPIO_INTC + 0x3c)
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#define GPIO_INT_CONNECTED_MASK 0x0d
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iowrite32(0xffffffff, (void __iomem *) GPIO_INTMASK);
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iowrite32(~GPIO_INT_CONNECTED_MASK, (void __iomem *) GPIO_INTMASK);
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iowrite32(0x00000000, (void __iomem *) GPIO_INTTYPE_LEVEL);
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iowrite32(0xffffffff, (void __iomem *) GPIO_INT_POLARITY);
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iowrite32(GPIO_INT_CONNECTED_MASK, (void __iomem *) GPIO_INTEN);
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}
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static void __init hsdk_init_early(void)
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{
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/*
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* PAE remapping for DMA clients does not work due to an RTL bug, so
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* CREG_PAE register must be programmed to all zeroes, otherwise it
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* will cause problems with DMA to/from peripherals even if PAE40 is
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* not used.
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*/
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/* Default is 1, which means "PAE offset = 4GByte" */
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writel_relaxed(0, (void __iomem *) CREG_PAE);
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/* Really apply settings made above */
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writel(1, (void __iomem *) CREG_PAE_UPDATE);
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/*
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* Switch SDIO external ciu clock divider from default div-by-8 to
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* minimum possible div-by-2.
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*/
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iowrite32(SDIO_UHS_REG_EXT_DIV_2, (void __iomem *) SDIO_UHS_REG_EXT);
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hsdk_enable_gpio_intc_wire();
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}
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static const char *hsdk_compat[] __initconst = {
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"snps,hsdk",
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NULL,
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};
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MACHINE_START(SIMULATION, "hsdk")
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.dt_compat = hsdk_compat,
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.init_early = hsdk_init_early,
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.init_per_cpu = hsdk_init_per_cpu,
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MACHINE_END
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