From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/powerpc/sysdev/mpc8xx_pic.c | 163 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 163 insertions(+) create mode 100644 arch/powerpc/sysdev/mpc8xx_pic.c (limited to 'arch/powerpc/sysdev/mpc8xx_pic.c') diff --git a/arch/powerpc/sysdev/mpc8xx_pic.c b/arch/powerpc/sysdev/mpc8xx_pic.c new file mode 100644 index 000000000..c4828c0be --- /dev/null +++ b/arch/powerpc/sysdev/mpc8xx_pic.c @@ -0,0 +1,163 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "mpc8xx_pic.h" + + +#define PIC_VEC_SPURRIOUS 15 + +extern int cpm_get_irq(struct pt_regs *regs); + +static struct irq_domain *mpc8xx_pic_host; +static unsigned long mpc8xx_cached_irq_mask; +static sysconf8xx_t __iomem *siu_reg; + +static inline unsigned long mpc8xx_irqd_to_bit(struct irq_data *d) +{ + return 0x80000000 >> irqd_to_hwirq(d); +} + +static void mpc8xx_unmask_irq(struct irq_data *d) +{ + mpc8xx_cached_irq_mask |= mpc8xx_irqd_to_bit(d); + out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask); +} + +static void mpc8xx_mask_irq(struct irq_data *d) +{ + mpc8xx_cached_irq_mask &= ~mpc8xx_irqd_to_bit(d); + out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask); +} + +static void mpc8xx_ack(struct irq_data *d) +{ + out_be32(&siu_reg->sc_sipend, mpc8xx_irqd_to_bit(d)); +} + +static void mpc8xx_end_irq(struct irq_data *d) +{ + mpc8xx_cached_irq_mask |= mpc8xx_irqd_to_bit(d); + out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask); +} + +static int mpc8xx_set_irq_type(struct irq_data *d, unsigned int flow_type) +{ + /* only external IRQ senses are programmable */ + if ((flow_type & IRQ_TYPE_EDGE_FALLING) && !(irqd_to_hwirq(d) & 1)) { + unsigned int siel = in_be32(&siu_reg->sc_siel); + siel |= mpc8xx_irqd_to_bit(d); + out_be32(&siu_reg->sc_siel, siel); + __irq_set_handler_locked(d->irq, handle_edge_irq); + } + return 0; +} + +static struct irq_chip mpc8xx_pic = { + .name = "MPC8XX SIU", + .irq_unmask = mpc8xx_unmask_irq, + .irq_mask = mpc8xx_mask_irq, + .irq_ack = mpc8xx_ack, + .irq_eoi = mpc8xx_end_irq, + .irq_set_type = mpc8xx_set_irq_type, +}; + +unsigned int mpc8xx_get_irq(void) +{ + int irq; + + /* For MPC8xx, read the SIVEC register and shift the bits down + * to get the irq number. + */ + irq = in_be32(&siu_reg->sc_sivec) >> 26; + + if (irq == PIC_VEC_SPURRIOUS) + irq = NO_IRQ; + + return irq_linear_revmap(mpc8xx_pic_host, irq); + +} + +static int mpc8xx_pic_host_map(struct irq_domain *h, unsigned int virq, + irq_hw_number_t hw) +{ + pr_debug("mpc8xx_pic_host_map(%d, 0x%lx)\n", virq, hw); + + /* Set default irq handle */ + irq_set_chip_and_handler(virq, &mpc8xx_pic, handle_level_irq); + return 0; +} + + +static int mpc8xx_pic_host_xlate(struct irq_domain *h, struct device_node *ct, + const u32 *intspec, unsigned int intsize, + irq_hw_number_t *out_hwirq, unsigned int *out_flags) +{ + static unsigned char map_pic_senses[4] = { + IRQ_TYPE_EDGE_RISING, + IRQ_TYPE_LEVEL_LOW, + IRQ_TYPE_LEVEL_HIGH, + IRQ_TYPE_EDGE_FALLING, + }; + + if (intspec[0] > 0x1f) + return 0; + + *out_hwirq = intspec[0]; + if (intsize > 1 && intspec[1] < 4) + *out_flags = map_pic_senses[intspec[1]]; + else + *out_flags = IRQ_TYPE_NONE; + + return 0; +} + + +static struct irq_domain_ops mpc8xx_pic_host_ops = { + .map = mpc8xx_pic_host_map, + .xlate = mpc8xx_pic_host_xlate, +}; + +int mpc8xx_pic_init(void) +{ + struct resource res; + struct device_node *np; + int ret; + + np = of_find_compatible_node(NULL, NULL, "fsl,pq1-pic"); + if (np == NULL) + np = of_find_node_by_type(NULL, "mpc8xx-pic"); + if (np == NULL) { + printk(KERN_ERR "Could not find fsl,pq1-pic node\n"); + return -ENOMEM; + } + + ret = of_address_to_resource(np, 0, &res); + if (ret) + goto out; + + siu_reg = ioremap(res.start, resource_size(&res)); + if (siu_reg == NULL) { + ret = -EINVAL; + goto out; + } + + mpc8xx_pic_host = irq_domain_add_linear(np, 64, &mpc8xx_pic_host_ops, NULL); + if (mpc8xx_pic_host == NULL) { + printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n"); + ret = -ENOMEM; + goto out; + } + return 0; + +out: + of_node_put(np); + return ret; +} -- cgit v1.2.3-54-g00ecf