cregit-Linux how code gets into the kernel

Release 4.14 arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c

/*
 * arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
 *
 * udbg serial input/output routines for the USB Gecko adapter.
 * Copyright (C) 2008-2009 The GameCube Linux Team
 * Copyright (C) 2008,2009 Albert Herranz
 *
 * 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.
 *
 */

#include <mm/mmu_decl.h>

#include <asm/io.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/fixmap.h>

#include "usbgecko_udbg.h"



#define EXI_CLK_32MHZ           5


#define EXI_CSR                 0x00

#define   EXI_CSR_CLKMASK       (0x7<<4)

#define     EXI_CSR_CLK_32MHZ   (EXI_CLK_32MHZ<<4)

#define   EXI_CSR_CSMASK        (0x7<<7)

#define     EXI_CSR_CS_0        (0x1<<7)  
/* Chip Select 001 */


#define EXI_CR                  0x0c

#define   EXI_CR_TSTART         (1<<0)

#define   EXI_CR_WRITE		(1<<2)

#define   EXI_CR_READ_WRITE     (2<<2)

#define   EXI_CR_TLEN(len)      (((len)-1)<<4)


#define EXI_DATA                0x10


#define UG_READ_ATTEMPTS	100

#define UG_WRITE_ATTEMPTS	100



static void __iomem *ug_io_base;

/*
 * Performs one input/output transaction between the exi host and the usbgecko.
 */

static u32 ug_io_transaction(u32 in) { u32 __iomem *csr_reg = ug_io_base + EXI_CSR; u32 __iomem *data_reg = ug_io_base + EXI_DATA; u32 __iomem *cr_reg = ug_io_base + EXI_CR; u32 csr, data, cr; /* select */ csr = EXI_CSR_CLK_32MHZ | EXI_CSR_CS_0; out_be32(csr_reg, csr); /* read/write */ data = in; out_be32(data_reg, data); cr = EXI_CR_TLEN(2) | EXI_CR_READ_WRITE | EXI_CR_TSTART; out_be32(cr_reg, cr); while (in_be32(cr_reg) & EXI_CR_TSTART) barrier(); /* deselect */ out_be32(csr_reg, 0); /* result */ data = in_be32(data_reg); return data; }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz118100.00%1100.00%
Total118100.00%1100.00%

/* * Returns true if an usbgecko adapter is found. */
static int ug_is_adapter_present(void) { if (!ug_io_base) return 0; return ug_io_transaction(0x90000000) == 0x04700000; }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz24100.00%1100.00%
Total24100.00%1100.00%

/* * Returns true if the TX fifo is ready for transmission. */
static int ug_is_txfifo_ready(void) { return ug_io_transaction(0xc0000000) & 0x04000000; }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz16100.00%1100.00%
Total16100.00%1100.00%

/* * Tries to transmit a character. * If the TX fifo is not ready the result is undefined. */
static void ug_raw_putc(char ch) { ug_io_transaction(0xb0000000 | (ch << 20)); }

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PersonTokensPropCommitsCommitProp
Albert Herranz20100.00%1100.00%
Total20100.00%1100.00%

/* * Transmits a character. * It silently fails if the TX fifo is not ready after a number of retries. */
static void ug_putc(char ch) { int count = UG_WRITE_ATTEMPTS; if (!ug_io_base) return; if (ch == '\n') ug_putc('\r'); while (!ug_is_txfifo_ready() && count--) barrier(); if (count >= 0) ug_raw_putc(ch); }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz54100.00%2100.00%
Total54100.00%2100.00%

/* * Returns true if the RX fifo is ready for transmission. */
static int ug_is_rxfifo_ready(void) { return ug_io_transaction(0xd0000000) & 0x04000000; }

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PersonTokensPropCommitsCommitProp
Albert Herranz16100.00%1100.00%
Total16100.00%1100.00%

/* * Tries to receive a character. * If a character is unavailable the function returns -1. */
static int ug_raw_getc(void) { u32 data = ug_io_transaction(0xa0000000); if (data & 0x08000000) return (data >> 16) & 0xff; else return -1; }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz36100.00%1100.00%
Total36100.00%1100.00%

/* * Receives a character. * It fails if the RX fifo is not ready after a number of retries. */
static int ug_getc(void) { int count = UG_READ_ATTEMPTS; if (!ug_io_base) return -1; while (!ug_is_rxfifo_ready() && count--) barrier(); return ug_raw_getc(); }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz38100.00%1100.00%
Total38100.00%1100.00%

/* * udbg functions. * */ /* * Transmits a character. */
void ug_udbg_putc(char ch) { ug_putc(ch); }

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PersonTokensPropCommitsCommitProp
Albert Herranz13100.00%1100.00%
Total13100.00%1100.00%

/* * Receives a character. Waits until a character is available. */
static int ug_udbg_getc(void) { int ch; while ((ch = ug_getc()) == -1) barrier(); return ch; }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz29100.00%1100.00%
Total29100.00%1100.00%

/* * Receives a character. If a character is not available, returns -1. */
static int ug_udbg_getc_poll(void) { if (!ug_is_rxfifo_ready()) return -1; return ug_getc(); }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz22100.00%1100.00%
Total22100.00%1100.00%

/* * Retrieves and prepares the virtual address needed to access the hardware. */
static void __iomem *ug_udbg_setup_exi_io_base(struct device_node *np) { void __iomem *exi_io_base = NULL; phys_addr_t paddr; const unsigned int *reg; reg = of_get_property(np, "reg", NULL); if (reg) { paddr = of_translate_address(np, reg); if (paddr) exi_io_base = ioremap(paddr, reg[1]); } return exi_io_base; }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz74100.00%1100.00%
Total74100.00%1100.00%

/* * Checks if a USB Gecko adapter is inserted in any memory card slot. */
static void __iomem *ug_udbg_probe(void __iomem *exi_io_base) { int i; /* look for a usbgecko on memcard slots A and B */ for (i = 0; i < 2; i++) { ug_io_base = exi_io_base + 0x14 * i; if (ug_is_adapter_present()) break; } if (i == 2) ug_io_base = NULL; return ug_io_base; }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz59100.00%1100.00%
Total59100.00%1100.00%

/* * USB Gecko udbg support initialization. */
void __init ug_udbg_init(void) { struct device_node *np; void __iomem *exi_io_base; if (ug_io_base) udbg_printf("%s: early -> final\n", __func__); np = of_find_compatible_node(NULL, NULL, "nintendo,flipper-exi"); if (!np) { udbg_printf("%s: EXI node not found\n", __func__); goto out; } exi_io_base = ug_udbg_setup_exi_io_base(np); if (!exi_io_base) { udbg_printf("%s: failed to setup EXI io base\n", __func__); goto done; } if (!ug_udbg_probe(exi_io_base)) { udbg_printf("usbgecko_udbg: not found\n"); iounmap(exi_io_base); } else { udbg_putc = ug_udbg_putc; udbg_getc = ug_udbg_getc; udbg_getc_poll = ug_udbg_getc_poll; udbg_printf("usbgecko_udbg: ready\n"); } done: of_node_put(np); out: return; }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz12897.71%150.00%
Julia Lawall32.29%150.00%
Total131100.00%2100.00%

#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO
static phys_addr_t __init ug_early_grab_io_addr(void) { #if defined(CONFIG_GAMECUBE) return 0x0c000000; #elif defined(CONFIG_WII) return 0x0d000000; #else #error Invalid platform for USB Gecko based early debugging. #endif }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz34100.00%1100.00%
Total34100.00%1100.00%

/* * USB Gecko early debug support initialization for udbg. */
void __init udbg_init_usbgecko(void) { void __iomem *early_debug_area; void __iomem *exi_io_base; /* * At this point we have a BAT already setup that enables I/O * to the EXI hardware. * * The BAT uses a virtual address range reserved at the fixmap. * This must match the virtual address configured in * head_32.S:setup_usbgecko_bat(). */ early_debug_area = (void __iomem *)__fix_to_virt(FIX_EARLY_DEBUG_BASE); exi_io_base = early_debug_area + 0x00006800; /* try to detect a USB Gecko */ if (!ug_udbg_probe(exi_io_base)) return; /* we found a USB Gecko, load udbg hooks */ udbg_putc = ug_udbg_putc; udbg_getc = ug_udbg_getc; udbg_getc_poll = ug_udbg_getc_poll; /* * Prepare again the same BAT for MMU_init. * This allows udbg I/O to continue working after the MMU is * turned on for real. * It is safe to continue using the same virtual address as it is * a reserved fixmap area. */ setbat(1, (unsigned long)early_debug_area, ug_early_grab_io_addr(), 128*1024, PAGE_KERNEL_NCG); }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz81100.00%1100.00%
Total81100.00%1100.00%

#endif /* CONFIG_PPC_EARLY_DEBUG_USBGECKO */

Overall Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz86999.66%375.00%
Julia Lawall30.34%125.00%
Total872100.00%4100.00%
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