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323 lines
6.5 KiB
323 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c |
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* |
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* udbg serial input/output routines for the USB Gecko adapter. |
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* Copyright (C) 2008-2009 The GameCube Linux Team |
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* Copyright (C) 2008,2009 Albert Herranz |
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*/ |
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#include <mm/mmu_decl.h> |
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#include <asm/io.h> |
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#include <asm/prom.h> |
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#include <asm/udbg.h> |
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#include <asm/fixmap.h> |
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#include "usbgecko_udbg.h" |
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#define EXI_CLK_32MHZ 5 |
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#define EXI_CSR 0x00 |
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#define EXI_CSR_CLKMASK (0x7<<4) |
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#define EXI_CSR_CLK_32MHZ (EXI_CLK_32MHZ<<4) |
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#define EXI_CSR_CSMASK (0x7<<7) |
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#define EXI_CSR_CS_0 (0x1<<7) /* Chip Select 001 */ |
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#define EXI_CR 0x0c |
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#define EXI_CR_TSTART (1<<0) |
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#define EXI_CR_WRITE (1<<2) |
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#define EXI_CR_READ_WRITE (2<<2) |
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#define EXI_CR_TLEN(len) (((len)-1)<<4) |
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#define EXI_DATA 0x10 |
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#define UG_READ_ATTEMPTS 100 |
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#define UG_WRITE_ATTEMPTS 100 |
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static void __iomem *ug_io_base; |
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/* |
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* Performs one input/output transaction between the exi host and the usbgecko. |
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*/ |
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static u32 ug_io_transaction(u32 in) |
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{ |
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u32 __iomem *csr_reg = ug_io_base + EXI_CSR; |
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u32 __iomem *data_reg = ug_io_base + EXI_DATA; |
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u32 __iomem *cr_reg = ug_io_base + EXI_CR; |
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u32 csr, data, cr; |
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/* select */ |
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csr = EXI_CSR_CLK_32MHZ | EXI_CSR_CS_0; |
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out_be32(csr_reg, csr); |
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/* read/write */ |
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data = in; |
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out_be32(data_reg, data); |
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cr = EXI_CR_TLEN(2) | EXI_CR_READ_WRITE | EXI_CR_TSTART; |
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out_be32(cr_reg, cr); |
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while (in_be32(cr_reg) & EXI_CR_TSTART) |
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barrier(); |
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/* deselect */ |
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out_be32(csr_reg, 0); |
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/* result */ |
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data = in_be32(data_reg); |
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return data; |
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} |
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/* |
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* Returns true if an usbgecko adapter is found. |
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*/ |
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static int ug_is_adapter_present(void) |
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{ |
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if (!ug_io_base) |
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return 0; |
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return ug_io_transaction(0x90000000) == 0x04700000; |
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} |
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/* |
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* Returns true if the TX fifo is ready for transmission. |
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*/ |
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static int ug_is_txfifo_ready(void) |
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{ |
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return ug_io_transaction(0xc0000000) & 0x04000000; |
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} |
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/* |
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* Tries to transmit a character. |
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* If the TX fifo is not ready the result is undefined. |
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*/ |
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static void ug_raw_putc(char ch) |
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{ |
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ug_io_transaction(0xb0000000 | (ch << 20)); |
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} |
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/* |
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* Transmits a character. |
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* It silently fails if the TX fifo is not ready after a number of retries. |
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*/ |
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static void ug_putc(char ch) |
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{ |
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int count = UG_WRITE_ATTEMPTS; |
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if (!ug_io_base) |
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return; |
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if (ch == '\n') |
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ug_putc('\r'); |
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while (!ug_is_txfifo_ready() && count--) |
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barrier(); |
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if (count >= 0) |
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ug_raw_putc(ch); |
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} |
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/* |
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* Returns true if the RX fifo is ready for transmission. |
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*/ |
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static int ug_is_rxfifo_ready(void) |
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{ |
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return ug_io_transaction(0xd0000000) & 0x04000000; |
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} |
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/* |
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* Tries to receive a character. |
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* If a character is unavailable the function returns -1. |
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*/ |
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static int ug_raw_getc(void) |
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{ |
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u32 data = ug_io_transaction(0xa0000000); |
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if (data & 0x08000000) |
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return (data >> 16) & 0xff; |
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else |
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return -1; |
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} |
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/* |
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* Receives a character. |
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* It fails if the RX fifo is not ready after a number of retries. |
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*/ |
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static int ug_getc(void) |
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{ |
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int count = UG_READ_ATTEMPTS; |
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if (!ug_io_base) |
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return -1; |
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while (!ug_is_rxfifo_ready() && count--) |
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barrier(); |
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return ug_raw_getc(); |
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} |
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/* |
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* udbg functions. |
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* |
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*/ |
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/* |
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* Transmits a character. |
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*/ |
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static void ug_udbg_putc(char ch) |
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{ |
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ug_putc(ch); |
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} |
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/* |
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* Receives a character. Waits until a character is available. |
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*/ |
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static int ug_udbg_getc(void) |
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{ |
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int ch; |
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while ((ch = ug_getc()) == -1) |
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barrier(); |
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return ch; |
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} |
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/* |
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* Receives a character. If a character is not available, returns -1. |
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*/ |
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static int ug_udbg_getc_poll(void) |
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{ |
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if (!ug_is_rxfifo_ready()) |
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return -1; |
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return ug_getc(); |
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} |
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/* |
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* Retrieves and prepares the virtual address needed to access the hardware. |
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*/ |
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static void __iomem *ug_udbg_setup_exi_io_base(struct device_node *np) |
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{ |
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void __iomem *exi_io_base = NULL; |
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phys_addr_t paddr; |
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const unsigned int *reg; |
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reg = of_get_property(np, "reg", NULL); |
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if (reg) { |
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paddr = of_translate_address(np, reg); |
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if (paddr) |
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exi_io_base = ioremap(paddr, reg[1]); |
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} |
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return exi_io_base; |
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} |
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/* |
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* Checks if a USB Gecko adapter is inserted in any memory card slot. |
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*/ |
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static void __iomem *ug_udbg_probe(void __iomem *exi_io_base) |
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{ |
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int i; |
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/* look for a usbgecko on memcard slots A and B */ |
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for (i = 0; i < 2; i++) { |
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ug_io_base = exi_io_base + 0x14 * i; |
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if (ug_is_adapter_present()) |
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break; |
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} |
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if (i == 2) |
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ug_io_base = NULL; |
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return ug_io_base; |
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} |
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/* |
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* USB Gecko udbg support initialization. |
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*/ |
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void __init ug_udbg_init(void) |
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{ |
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struct device_node *np; |
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void __iomem *exi_io_base; |
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if (ug_io_base) |
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udbg_printf("%s: early -> final\n", __func__); |
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np = of_find_compatible_node(NULL, NULL, "nintendo,flipper-exi"); |
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if (!np) { |
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udbg_printf("%s: EXI node not found\n", __func__); |
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goto out; |
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} |
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exi_io_base = ug_udbg_setup_exi_io_base(np); |
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if (!exi_io_base) { |
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udbg_printf("%s: failed to setup EXI io base\n", __func__); |
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goto done; |
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} |
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if (!ug_udbg_probe(exi_io_base)) { |
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udbg_printf("usbgecko_udbg: not found\n"); |
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iounmap(exi_io_base); |
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} else { |
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udbg_putc = ug_udbg_putc; |
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udbg_getc = ug_udbg_getc; |
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udbg_getc_poll = ug_udbg_getc_poll; |
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udbg_printf("usbgecko_udbg: ready\n"); |
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} |
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done: |
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of_node_put(np); |
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out: |
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return; |
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} |
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#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO |
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static phys_addr_t __init ug_early_grab_io_addr(void) |
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{ |
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#if defined(CONFIG_GAMECUBE) |
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return 0x0c000000; |
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#elif defined(CONFIG_WII) |
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return 0x0d000000; |
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#else |
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#error Invalid platform for USB Gecko based early debugging. |
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#endif |
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} |
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/* |
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* USB Gecko early debug support initialization for udbg. |
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*/ |
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void __init udbg_init_usbgecko(void) |
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{ |
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void __iomem *early_debug_area; |
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void __iomem *exi_io_base; |
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/* |
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* At this point we have a BAT already setup that enables I/O |
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* to the EXI hardware. |
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* |
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* The BAT uses a virtual address range reserved at the fixmap. |
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* This must match the virtual address configured in |
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* head_32.S:setup_usbgecko_bat(). |
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*/ |
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early_debug_area = (void __iomem *)__fix_to_virt(FIX_EARLY_DEBUG_BASE); |
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exi_io_base = early_debug_area + 0x00006800; |
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/* try to detect a USB Gecko */ |
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if (!ug_udbg_probe(exi_io_base)) |
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return; |
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/* we found a USB Gecko, load udbg hooks */ |
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udbg_putc = ug_udbg_putc; |
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udbg_getc = ug_udbg_getc; |
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udbg_getc_poll = ug_udbg_getc_poll; |
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/* |
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* Prepare again the same BAT for MMU_init. |
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* This allows udbg I/O to continue working after the MMU is |
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* turned on for real. |
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* It is safe to continue using the same virtual address as it is |
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* a reserved fixmap area. |
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*/ |
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setbat(1, (unsigned long)early_debug_area, |
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ug_early_grab_io_addr(), 128*1024, PAGE_KERNEL_NCG); |
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} |
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#endif /* CONFIG_PPC_EARLY_DEBUG_USBGECKO */ |
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