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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/mips/pci/pci-tx4927.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/pci/pci-tx4927.c')
-rw-r--r-- | arch/mips/pci/pci-tx4927.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/arch/mips/pci/pci-tx4927.c b/arch/mips/pci/pci-tx4927.c new file mode 100644 index 000000000..9b3301d19 --- /dev/null +++ b/arch/mips/pci/pci-tx4927.c @@ -0,0 +1,91 @@ +/* + * Based on linux/arch/mips/txx9/rbtx4938/setup.c, + * and RBTX49xx patch from CELF patch archive. + * + * Copyright 2001, 2003-2005 MontaVista Software Inc. + * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org) + * (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007 + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <asm/txx9/generic.h> +#include <asm/txx9/tx4927.h> + +int __init tx4927_report_pciclk(void) +{ + int pciclk = 0; + + pr_info("PCIC --%s PCICLK:", + (__raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_PCI66) ? + " PCI66" : ""); + if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) { + u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg); + switch ((unsigned long)ccfg & + TX4927_CCFG_PCIDIVMODE_MASK) { + case TX4927_CCFG_PCIDIVMODE_2_5: + pciclk = txx9_cpu_clock * 2 / 5; break; + case TX4927_CCFG_PCIDIVMODE_3: + pciclk = txx9_cpu_clock / 3; break; + case TX4927_CCFG_PCIDIVMODE_5: + pciclk = txx9_cpu_clock / 5; break; + case TX4927_CCFG_PCIDIVMODE_6: + pciclk = txx9_cpu_clock / 6; break; + } + pr_cont("Internal(%u.%uMHz)", + (pciclk + 50000) / 1000000, + ((pciclk + 50000) / 100000) % 10); + } else { + pr_cont("External"); + pciclk = -1; + } + pr_cont("\n"); + return pciclk; +} + +int __init tx4927_pciclk66_setup(void) +{ + int pciclk; + + /* Assert M66EN */ + tx4927_ccfg_set(TX4927_CCFG_PCI66); + /* Double PCICLK (if possible) */ + if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) { + unsigned int pcidivmode = 0; + u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg); + pcidivmode = (unsigned long)ccfg & + TX4927_CCFG_PCIDIVMODE_MASK; + switch (pcidivmode) { + case TX4927_CCFG_PCIDIVMODE_5: + case TX4927_CCFG_PCIDIVMODE_2_5: + pcidivmode = TX4927_CCFG_PCIDIVMODE_2_5; + pciclk = txx9_cpu_clock * 2 / 5; + break; + case TX4927_CCFG_PCIDIVMODE_6: + case TX4927_CCFG_PCIDIVMODE_3: + default: + pcidivmode = TX4927_CCFG_PCIDIVMODE_3; + pciclk = txx9_cpu_clock / 3; + } + tx4927_ccfg_change(TX4927_CCFG_PCIDIVMODE_MASK, + pcidivmode); + pr_debug("PCICLK: ccfg:%08lx\n", + (unsigned long)__raw_readq(&tx4927_ccfgptr->ccfg)); + } else + pciclk = -1; + return pciclk; +} + +void __init tx4927_setup_pcierr_irq(void) +{ + if (request_irq(TXX9_IRQ_BASE + TX4927_IR_PCIERR, + tx4927_pcierr_interrupt, + 0, "PCI error", + (void *)TX4927_PCIC_REG)) + pr_warn("Failed to request irq for PCIERR\n"); +} |