diff options
Diffstat (limited to 'arch/powerpc/sysdev/cpm_common.c')
| -rw-r--r-- | arch/powerpc/sysdev/cpm_common.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/cpm_common.c b/arch/powerpc/sysdev/cpm_common.c new file mode 100644 index 000000000..47db73298 --- /dev/null +++ b/arch/powerpc/sysdev/cpm_common.c @@ -0,0 +1,217 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Common CPM code + * + * Author: Scott Wood <scottwood@freescale.com> + * + * Copyright 2007-2008,2010 Freescale Semiconductor, Inc. + * + * Some parts derived from commproc.c/cpm2_common.c, which is: + * Copyright (c) 1997 Dan error_act (dmalek@jlc.net) + * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com> + * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com) + * 2006 (c) MontaVista Software, Inc. + * Vitaly Bordug <vbordug@ru.mvista.com> + */ + +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/export.h> +#include <linux/of.h> +#include <linux/slab.h> + +#include <asm/udbg.h> +#include <asm/io.h> +#include <asm/cpm.h> +#include <asm/fixmap.h> +#include <soc/fsl/qe/qe.h> + +#include <mm/mmu_decl.h> + +#if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO) +#include <linux/gpio/legacy-of-mm-gpiochip.h> +#endif + +static int __init cpm_init(void) +{ + struct device_node *np; + + np = of_find_compatible_node(NULL, NULL, "fsl,cpm1"); + if (!np) + np = of_find_compatible_node(NULL, NULL, "fsl,cpm2"); + if (!np) + return -ENODEV; + cpm_muram_init(); + of_node_put(np); + return 0; +} +subsys_initcall(cpm_init); + +#ifdef CONFIG_PPC_EARLY_DEBUG_CPM +static u32 __iomem *cpm_udbg_txdesc; +static u8 __iomem *cpm_udbg_txbuf; + +static void udbg_putc_cpm(char c) +{ + if (c == '\n') + udbg_putc_cpm('\r'); + + while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000) + ; + + out_8(cpm_udbg_txbuf, c); + out_be32(&cpm_udbg_txdesc[0], 0xa0000001); +} + +void __init udbg_init_cpm(void) +{ +#ifdef CONFIG_PPC_8xx + mmu_mapin_immr(); + + cpm_udbg_txdesc = (u32 __iomem __force *) + (CONFIG_PPC_EARLY_DEBUG_CPM_ADDR - PHYS_IMMR_BASE + + VIRT_IMMR_BASE); + cpm_udbg_txbuf = (u8 __iomem __force *) + (in_be32(&cpm_udbg_txdesc[1]) - PHYS_IMMR_BASE + + VIRT_IMMR_BASE); +#else + cpm_udbg_txdesc = (u32 __iomem __force *) + CONFIG_PPC_EARLY_DEBUG_CPM_ADDR; + cpm_udbg_txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]); +#endif + + if (cpm_udbg_txdesc) { +#ifdef CONFIG_CPM2 + setbat(1, 0xf0000000, 0xf0000000, 1024*1024, PAGE_KERNEL_NCG); +#endif + udbg_putc = udbg_putc_cpm; + } +} +#endif + +#if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO) + +struct cpm2_ioports { + u32 dir, par, sor, odr, dat; + u32 res[3]; +}; + +struct cpm2_gpio32_chip { + struct of_mm_gpio_chip mm_gc; + spinlock_t lock; + + /* shadowed data register to clear/set bits safely */ + u32 cpdata; +}; + +static void cpm2_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc) +{ + struct cpm2_gpio32_chip *cpm2_gc = + container_of(mm_gc, struct cpm2_gpio32_chip, mm_gc); + struct cpm2_ioports __iomem *iop = mm_gc->regs; + + cpm2_gc->cpdata = in_be32(&iop->dat); +} + +static int cpm2_gpio32_get(struct gpio_chip *gc, unsigned int gpio) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct cpm2_ioports __iomem *iop = mm_gc->regs; + u32 pin_mask; + + pin_mask = 1 << (31 - gpio); + + return !!(in_be32(&iop->dat) & pin_mask); +} + +static void __cpm2_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask, + int value) +{ + struct cpm2_gpio32_chip *cpm2_gc = gpiochip_get_data(&mm_gc->gc); + struct cpm2_ioports __iomem *iop = mm_gc->regs; + + if (value) + cpm2_gc->cpdata |= pin_mask; + else + cpm2_gc->cpdata &= ~pin_mask; + + out_be32(&iop->dat, cpm2_gc->cpdata); +} + +static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct cpm2_gpio32_chip *cpm2_gc = gpiochip_get_data(gc); + unsigned long flags; + u32 pin_mask = 1 << (31 - gpio); + + spin_lock_irqsave(&cpm2_gc->lock, flags); + + __cpm2_gpio32_set(mm_gc, pin_mask, value); + + spin_unlock_irqrestore(&cpm2_gc->lock, flags); +} + +static int cpm2_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct cpm2_gpio32_chip *cpm2_gc = gpiochip_get_data(gc); + struct cpm2_ioports __iomem *iop = mm_gc->regs; + unsigned long flags; + u32 pin_mask = 1 << (31 - gpio); + + spin_lock_irqsave(&cpm2_gc->lock, flags); + + setbits32(&iop->dir, pin_mask); + __cpm2_gpio32_set(mm_gc, pin_mask, val); + + spin_unlock_irqrestore(&cpm2_gc->lock, flags); + + return 0; +} + +static int cpm2_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct cpm2_gpio32_chip *cpm2_gc = gpiochip_get_data(gc); + struct cpm2_ioports __iomem *iop = mm_gc->regs; + unsigned long flags; + u32 pin_mask = 1 << (31 - gpio); + + spin_lock_irqsave(&cpm2_gc->lock, flags); + + clrbits32(&iop->dir, pin_mask); + + spin_unlock_irqrestore(&cpm2_gc->lock, flags); + + return 0; +} + +int cpm2_gpiochip_add32(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct cpm2_gpio32_chip *cpm2_gc; + struct of_mm_gpio_chip *mm_gc; + struct gpio_chip *gc; + + cpm2_gc = kzalloc(sizeof(*cpm2_gc), GFP_KERNEL); + if (!cpm2_gc) + return -ENOMEM; + + spin_lock_init(&cpm2_gc->lock); + + mm_gc = &cpm2_gc->mm_gc; + gc = &mm_gc->gc; + + mm_gc->save_regs = cpm2_gpio32_save_regs; + gc->ngpio = 32; + gc->direction_input = cpm2_gpio32_dir_in; + gc->direction_output = cpm2_gpio32_dir_out; + gc->get = cpm2_gpio32_get; + gc->set = cpm2_gpio32_set; + gc->parent = dev; + gc->owner = THIS_MODULE; + + return of_mm_gpiochip_add_data(np, mm_gc, cpm2_gc); +} +#endif /* CONFIG_CPM2 || CONFIG_8xx_GPIO */ |