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HardenedBSD/sys/arm/xilinx/zy7_devcfg.c
Ian Lepore 0bd55d38ec Use edge-triggered interrupts rather than polling loops to avoid missing 
transitions of the INIT_B line.  Also, release the mutex during uiomove().

Submitted by:	Thomas Skibo <ThomasSkibo@sbcglobal.net>
2014-05-08 17:20:45 +00:00

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/*-
* Copyright (c) 2013 Thomas Skibo
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Zynq-7000 Devcfg driver. This allows programming the PL (FPGA) section
* of Zynq.
*
* Reference: Zynq-7000 All Programmable SoC Technical Reference Manual.
* (v1.4) November 16, 2012. Xilinx doc UG585. PL Configuration is
* covered in section 6.4.5.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <sys/uio.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <machine/stdarg.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/xilinx/zy7_slcr.h>
struct zy7_devcfg_softc {
device_t dev;
struct mtx sc_mtx;
struct resource *mem_res;
struct resource *irq_res;
struct cdev *sc_ctl_dev;
void *intrhandle;
bus_dma_tag_t dma_tag;
bus_dmamap_t dma_map;
int is_open;
};
static struct zy7_devcfg_softc *zy7_devcfg_softc_p;
#define DEVCFG_SC_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
#define DEVCFG_SC_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
#define DEVCFG_SC_LOCK_INIT(sc) \
mtx_init(&(sc)->sc_mtx, device_get_nameunit((sc)->dev), \
"zy7_devcfg", MTX_DEF)
#define DEVCFG_SC_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx);
#define DEVCFG_SC_ASSERT_LOCKED(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED);
#define RD4(sc, off) (bus_read_4((sc)->mem_res, (off)))
#define WR4(sc, off, val) (bus_write_4((sc)->mem_res, (off), (val)))
SYSCTL_NODE(_hw, OID_AUTO, fpga, CTLFLAG_RD, 0, \
"Xilinx Zynq-7000 PL (FPGA) section");
static int zy7_devcfg_sysctl_pl_done(SYSCTL_HANDLER_ARGS);
SYSCTL_PROC(_hw_fpga, OID_AUTO, pl_done, CTLTYPE_INT | CTLFLAG_RD, NULL, 0,
zy7_devcfg_sysctl_pl_done, "I", "PL section config DONE signal");
static int zy7_en_level_shifters = 1;
SYSCTL_INT(_hw_fpga, OID_AUTO, en_level_shifters, CTLFLAG_RW,
&zy7_en_level_shifters, 0,
"Enable PS-PL level shifters after device config");
static int zy7_ps_vers = 0;
SYSCTL_INT(_hw, OID_AUTO, ps_vers, CTLFLAG_RD, &zy7_ps_vers, 0,
"Zynq-7000 PS version");
/* cdev entry points. */
static int zy7_devcfg_open(struct cdev *, int, int, struct thread *);
static int zy7_devcfg_write(struct cdev *, struct uio *, int);
static int zy7_devcfg_close(struct cdev *, int, int, struct thread *);
struct cdevsw zy7_devcfg_cdevsw = {
.d_version = D_VERSION,
.d_open = zy7_devcfg_open,
.d_write = zy7_devcfg_write,
.d_close = zy7_devcfg_close,
.d_name = "devcfg",
};
/* Devcfg block registers. */
#define ZY7_DEVCFG_CTRL 0x0000
#define ZY7_DEVCFG_CTRL_FORCE_RST (1<<31)
#define ZY7_DEVCFG_CTRL_PCFG_PROG_B (1<<30)
#define ZY7_DEVCFG_CTRL_PCFG_POR_CNT_4K (1<<29)
#define ZY7_DEVCFG_CTRL_PCAP_PR (1<<27)
#define ZY7_DEVCFG_CTRL_PCAP_MODE (1<<26)
#define ZY7_DEVCFG_CTRL_QTR_PCAP_RATE_EN (1<<25)
#define ZY7_DEVCFG_CTRL_MULTIBOOT_EN (1<<24)
#define ZY7_DEVCFG_CTRL_JTAG_CHAIN_DIS (1<<23)
#define ZY7_DEVCFG_CTRL_USER_MODE (1<<15)
#define ZY7_DEVCFG_CTRL_RESVD_WR11 (3<<13) /* always write 11 */
#define ZY7_DEVCFG_CTRL_PCFG_AES_FUSE (1<<12)
#define ZY7_DEVCFG_CTRL_PCFG_AES_EN_MASK (7<<9) /* all 1's or 0's */
#define ZY7_DEVCFG_CTRL_SEU_EN (1<<8)
#define ZY7_DEVCFG_CTRL_SEC_EN (1<<7)
#define ZY7_DEVCFG_CTRL_SPNIDEN (1<<6)
#define ZY7_DEVCFG_CTRL_SPIDEN (1<<5)
#define ZY7_DEVCFG_CTRL_NIDEN (1<<4)
#define ZY7_DEVCFG_CTRL_DBGEN (1<<3)
#define ZY7_DEVCFG_CTRL_DAP_EN_MASK (7<<0) /* all 1's to enable */
#define ZY7_DEVCFG_LOCK 0x004
#define ZY7_DEVCFG_LOCK_AES_FUSE_LOCK (1<<4)
#define ZY7_DEVCFG_LOCK_AES_EN (1<<3)
#define ZY7_DEVCFG_LOCK_SEU_LOCK (1<<2)
#define ZY7_DEVCFG_LOCK_SEC_LOCK (1<<1)
#define ZY7_DEVCFG_LOCK_DBG_LOCK (1<<0)
#define ZY7_DEVCFG_CFG 0x008
#define ZY7_DEVCFG_CFG_RFIFO_TH_MASK (3<<10)
#define ZY7_DEVCFG_CFG_WFIFO_TH_MASK (3<<8)
#define ZY7_DEVCFG_CFG_RCLK_EDGE (1<<7)
#define ZY7_DEVCFG_CFG_WCLK_EDGE (1<<6)
#define ZY7_DEVCFG_CFG_DIS_SRC_INC (1<<5)
#define ZY7_DEVCFG_CFG_DIS_DST_INC (1<<4)
#define ZY7_DEVCFG_INT_STATUS 0x00C
#define ZY7_DEVCFG_INT_MASK 0x010
#define ZY7_DEVCFG_INT_PSS_GTS_USR_B (1<<31)
#define ZY7_DEVCFG_INT_PSS_FST_CFG_B (1<<30)
#define ZY7_DEVCFG_INT_PSS_GPWRDWN_B (1<<29)
#define ZY7_DEVCFG_INT_PSS_GTS_CFG_B (1<<28)
#define ZY7_DEVCFG_INT_CFG_RESET_B (1<<27)
#define ZY7_DEVCFG_INT_AXI_WTO (1<<23) /* axi write timeout */
#define ZY7_DEVCFG_INT_AXI_WERR (1<<22) /* axi write err */
#define ZY7_DEVCFG_INT_AXI_RTO (1<<21) /* axi read timeout */
#define ZY7_DEVCFG_INT_AXI_RERR (1<<20) /* axi read err */
#define ZY7_DEVCFG_INT_RX_FIFO_OV (1<<18) /* rx fifo overflow */
#define ZY7_DEVCFG_INT_WR_FIFO_LVL (1<<17) /* wr fifo < level */
#define ZY7_DEVCFG_INT_RD_FIFO_LVL (1<<16) /* rd fifo >= level */
#define ZY7_DEVCFG_INT_DMA_CMD_ERR (1<<15)
#define ZY7_DEVCFG_INT_DMA_Q_OV (1<<14)
#define ZY7_DEVCFG_INT_DMA_DONE (1<<13)
#define ZY7_DEVCFG_INT_DMA_PCAP_DONE (1<<12)
#define ZY7_DEVCFG_INT_P2D_LEN_ERR (1<<11)
#define ZY7_DEVCFG_INT_PCFG_HMAC_ERR (1<<6)
#define ZY7_DEVCFG_INT_PCFG_SEU_ERR (1<<5)
#define ZY7_DEVCFG_INT_PCFG_POR_B (1<<4)
#define ZY7_DEVCFG_INT_PCFG_CFG_RST (1<<3)
#define ZY7_DEVCFG_INT_PCFG_DONE (1<<2)
#define ZY7_DEVCFG_INT_PCFG_INIT_PE (1<<1)
#define ZY7_DEVCFG_INT_PCFG_INIT_NE (1<<0)
#define ZY7_DEVCFG_INT_ERRORS 0x00f0f860
#define ZY7_DEVCFG_INT_ALL 0xf8f7f87f
#define ZY7_DEVCFG_STATUS 0x014
#define ZY7_DEVCFG_STATUS_DMA_CMD_Q_F (1<<31) /* cmd queue full */
#define ZY7_DEVCFG_STATUS_DMA_CMD_Q_E (1<<30) /* cmd queue empty */
#define ZY7_DEVCFG_STATUS_DONE_COUNT_MASK (3<<28)
#define ZY7_DEVCFG_STATUS_DONE_COUNT_SHIFT 28
#define ZY7_DEVCFG_STATUS_RX_FIFO_LVL_MASK (0x1f<<20)
#define ZY7_DEVCFG_STATUS_RX_FIFO_LVL_SHIFT 20
#define ZY7_DEVCFG_STATUS_TX_FIFO_LVL_MASK (0x7f<<12)
#define ZY7_DEVCFG_STATUS_TX_FIFO_LVL_SHIFT 12
#define ZY7_DEVCFG_STATUS_PSS_GTS_USR_B (1<<11)
#define ZY7_DEVCFG_STATUS_PSS_FST_CFG_B (1<<10)
#define ZY7_DEVCFG_STATUS_PSS_GPWRDWN_B (1<<9)
#define ZY7_DEVCFG_STATUS_PSS_GTS_CFG_B (1<<8)
#define ZY7_DEVCFG_STATUS_ILL_APB_ACCE (1<<6)
#define ZY7_DEVCFG_STATUS_PSS_CFG_RESET_B (1<<5)
#define ZY7_DEVCFG_STATUS_PCFG_INIT (1<<4)
#define ZY7_DEVCFG_STATUS_EFUSE_BBRAM_KEY_DIS (1<<3)
#define ZY7_DEVCFG_STATUS_EFUSE_SEC_EN (1<<2)
#define ZY7_DEVCFG_STATUS_EFUSE_JTAG_DIS (1<<1)
#define ZY7_DEVCFG_DMA_SRC_ADDR 0x018
#define ZY7_DEVCFG_DMA_DST_ADDR 0x01c
#define ZY7_DEVCFG_DMA_ADDR_WAIT_PCAP 1
#define ZY7_DEVCFG_DMA_ADDR_ILLEGAL 0xffffffff
#define ZY7_DEVCFG_DMA_SRC_LEN 0x020 /* in 4-byte words. */
#define ZY7_DEVCFG_DMA_SRC_LEN_MAX 0x7ffffff
#define ZY7_DEVCFG_DMA_DST_LEN 0x024
#define ZY7_DEVCFG_ROM_SHADOW 0x028
#define ZY7_DEVCFG_MULTIBOOT_ADDR 0x02c
#define ZY7_DEVCFG_SW_ID 0x030
#define ZY7_DEVCFG_UNLOCK 0x034
#define ZY7_DEVCFG_UNLOCK_MAGIC 0x757bdf0d
#define ZY7_DEVCFG_MCTRL 0x080
#define ZY7_DEVCFG_MCTRL_PS_VERS_MASK (0xf<<28)
#define ZY7_DEVCFG_MCTRL_PS_VERS_SHIFT 28
#define ZY7_DEVCFG_MCTRL_PCFG_POR_B (1<<8)
#define ZY7_DEVCFG_MCTRL_INT_PCAP_LPBK (1<<4)
#define ZY7_DEVCFG_XADCIF_CFG 0x100
#define ZY7_DEVCFG_XADCIF_INT_STAT 0x104
#define ZY7_DEVCFG_XADCIF_INT_MASK 0x108
#define ZY7_DEVCFG_XADCIF_MSTS 0x10c
#define ZY7_DEVCFG_XADCIF_CMD_FIFO 0x110
#define ZY7_DEVCFG_XADCIF_RD_FIFO 0x114
#define ZY7_DEVCFG_XADCIF_MCTL 0x118
/* Enable programming the PL through PCAP. */
static void
zy7_devcfg_init_hw(struct zy7_devcfg_softc *sc)
{
DEVCFG_SC_ASSERT_LOCKED(sc);
/* Set devcfg control register. */
WR4(sc, ZY7_DEVCFG_CTRL,
ZY7_DEVCFG_CTRL_PCFG_PROG_B |
ZY7_DEVCFG_CTRL_PCAP_PR |
ZY7_DEVCFG_CTRL_PCAP_MODE |
ZY7_DEVCFG_CTRL_USER_MODE |
ZY7_DEVCFG_CTRL_RESVD_WR11 |
ZY7_DEVCFG_CTRL_SPNIDEN |
ZY7_DEVCFG_CTRL_SPIDEN |
ZY7_DEVCFG_CTRL_NIDEN |
ZY7_DEVCFG_CTRL_DBGEN |
ZY7_DEVCFG_CTRL_DAP_EN_MASK);
/* Turn off internal PCAP loopback. */
WR4(sc, ZY7_DEVCFG_MCTRL, RD4(sc, ZY7_DEVCFG_MCTRL) &
~ZY7_DEVCFG_MCTRL_INT_PCAP_LPBK);
}
/* Clear previous configuration of the PL by asserting PROG_B. */
static int
zy7_devcfg_reset_pl(struct zy7_devcfg_softc *sc)
{
uint32_t devcfg_ctl;
int tries, err;
DEVCFG_SC_ASSERT_LOCKED(sc);
devcfg_ctl = RD4(sc, ZY7_DEVCFG_CTRL);
/* Clear sticky bits and set up INIT signal positive edge interrupt. */
WR4(sc, ZY7_DEVCFG_INT_STATUS, ZY7_DEVCFG_INT_ALL);
WR4(sc, ZY7_DEVCFG_INT_MASK, ~ZY7_DEVCFG_INT_PCFG_INIT_PE);
/* Deassert PROG_B (active low). */
devcfg_ctl |= ZY7_DEVCFG_CTRL_PCFG_PROG_B;
WR4(sc, ZY7_DEVCFG_CTRL, devcfg_ctl);
/*
* Wait for INIT to assert. If it is already asserted, we may not get
* an edge interrupt so cancel it and continue.
*/
if ((RD4(sc, ZY7_DEVCFG_STATUS) &
ZY7_DEVCFG_STATUS_PCFG_INIT) != 0) {
/* Already asserted. Cancel interrupt. */
WR4(sc, ZY7_DEVCFG_INT_MASK, ~0);
}
else {
/* Wait for positive edge interrupt. */
err = mtx_sleep(sc, &sc->sc_mtx, PCATCH, "zy7i1", hz);
if (err != 0)
return (err);
}
/* Reassert PROG_B (active low). */
devcfg_ctl &= ~ZY7_DEVCFG_CTRL_PCFG_PROG_B;
WR4(sc, ZY7_DEVCFG_CTRL, devcfg_ctl);
/* Wait for INIT deasserted. This happens almost instantly. */
tries = 0;
while ((RD4(sc, ZY7_DEVCFG_STATUS) &
ZY7_DEVCFG_STATUS_PCFG_INIT) != 0) {
if (++tries >= 100)
return (EIO);
DELAY(5);
}
/* Clear sticky bits and set up INIT positive edge interrupt. */
WR4(sc, ZY7_DEVCFG_INT_STATUS, ZY7_DEVCFG_INT_ALL);
WR4(sc, ZY7_DEVCFG_INT_MASK, ~ZY7_DEVCFG_INT_PCFG_INIT_PE);
/* Deassert PROG_B again. */
devcfg_ctl |= ZY7_DEVCFG_CTRL_PCFG_PROG_B;
WR4(sc, ZY7_DEVCFG_CTRL, devcfg_ctl);
/*
* Wait for INIT asserted indicating FPGA internal initialization
* is complete.
*/
err = mtx_sleep(sc, &sc->sc_mtx, PCATCH, "zy7i2", hz);
if (err != 0)
return (err);
/* Clear sticky DONE bit in interrupt status. */
WR4(sc, ZY7_DEVCFG_INT_STATUS, ZY7_DEVCFG_INT_ALL);
return (0);
}
/* Callback function for bus_dmamap_load(). */
static void
zy7_dma_cb2(void *arg, bus_dma_segment_t *seg, int nsegs, int error)
{
if (!error && nsegs == 1)
*(bus_addr_t *)arg = seg[0].ds_addr;
}
static int
zy7_devcfg_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct zy7_devcfg_softc *sc = dev->si_drv1;
int err;
DEVCFG_SC_LOCK(sc);
if (sc->is_open) {
DEVCFG_SC_UNLOCK(sc);
return (EBUSY);
}
sc->dma_map = NULL;
err = bus_dma_tag_create(bus_get_dma_tag(sc->dev), 4, 0,
BUS_SPACE_MAXADDR_32BIT,
BUS_SPACE_MAXADDR,
NULL, NULL,
PAGE_SIZE,
1,
PAGE_SIZE,
0,
busdma_lock_mutex,
&sc->sc_mtx,
&sc->dma_tag);
if (err) {
DEVCFG_SC_UNLOCK(sc);
return (err);
}
sc->is_open = 1;
DEVCFG_SC_UNLOCK(sc);
return (0);
}
static int
zy7_devcfg_write(struct cdev *dev, struct uio *uio, int ioflag)
{
struct zy7_devcfg_softc *sc = dev->si_drv1;
void *dma_mem;
bus_addr_t dma_physaddr;
int segsz, err;
DEVCFG_SC_LOCK(sc);
/* First write? Reset PL. */
if (uio->uio_offset == 0 && uio->uio_resid > 0) {
zy7_devcfg_init_hw(sc);
zy7_slcr_preload_pl();
err = zy7_devcfg_reset_pl(sc);
if (err != 0) {
DEVCFG_SC_UNLOCK(sc);
return (err);
}
}
/* Allocate dma memory and load. */
err = bus_dmamem_alloc(sc->dma_tag, &dma_mem, BUS_DMA_NOWAIT,
&sc->dma_map);
if (err != 0) {
DEVCFG_SC_UNLOCK(sc);
return (err);
}
err = bus_dmamap_load(sc->dma_tag, sc->dma_map, dma_mem, PAGE_SIZE,
zy7_dma_cb2, &dma_physaddr, 0);
if (err != 0) {
bus_dmamem_free(sc->dma_tag, dma_mem, sc->dma_map);
DEVCFG_SC_UNLOCK(sc);
return (err);
}
while (uio->uio_resid > 0) {
/* If DONE signal has been set, we shouldn't write anymore. */
if ((RD4(sc, ZY7_DEVCFG_INT_STATUS) &
ZY7_DEVCFG_INT_PCFG_DONE) != 0) {
err = EIO;
break;
}
/* uiomove the data from user buffer to our dma map. */
segsz = MIN(PAGE_SIZE, uio->uio_resid);
DEVCFG_SC_UNLOCK(sc);
err = uiomove(dma_mem, segsz, uio);
DEVCFG_SC_LOCK(sc);
if (err != 0)
break;
/* Flush the cache to memory. */
bus_dmamap_sync(sc->dma_tag, sc->dma_map,
BUS_DMASYNC_PREWRITE);
/* Program devcfg's DMA engine. The ordering of these
* register writes is critical.
*/
if (uio->uio_resid > segsz)
WR4(sc, ZY7_DEVCFG_DMA_SRC_ADDR,
(uint32_t) dma_physaddr);
else
WR4(sc, ZY7_DEVCFG_DMA_SRC_ADDR,
(uint32_t) dma_physaddr |
ZY7_DEVCFG_DMA_ADDR_WAIT_PCAP);
WR4(sc, ZY7_DEVCFG_DMA_DST_ADDR, ZY7_DEVCFG_DMA_ADDR_ILLEGAL);
WR4(sc, ZY7_DEVCFG_DMA_SRC_LEN, (segsz+3)/4);
WR4(sc, ZY7_DEVCFG_DMA_DST_LEN, 0);
/* Now clear done bit and set up DMA done interrupt. */
WR4(sc, ZY7_DEVCFG_INT_STATUS, ZY7_DEVCFG_INT_ALL);
WR4(sc, ZY7_DEVCFG_INT_MASK, ~ZY7_DEVCFG_INT_DMA_DONE);
/* Wait for DMA done interrupt. */
err = mtx_sleep(sc->dma_map, &sc->sc_mtx, PCATCH,
"zy7dma", hz);
if (err != 0)
break;
bus_dmamap_sync(sc->dma_tag, sc->dma_map,
BUS_DMASYNC_POSTWRITE);
/* Check DONE signal. */
if ((RD4(sc, ZY7_DEVCFG_INT_STATUS) &
ZY7_DEVCFG_INT_PCFG_DONE) != 0)
zy7_slcr_postload_pl(zy7_en_level_shifters);
}
bus_dmamap_unload(sc->dma_tag, sc->dma_map);
bus_dmamem_free(sc->dma_tag, dma_mem, sc->dma_map);
DEVCFG_SC_UNLOCK(sc);
return (err);
}
static int
zy7_devcfg_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
struct zy7_devcfg_softc *sc = dev->si_drv1;
DEVCFG_SC_LOCK(sc);
sc->is_open = 0;
bus_dma_tag_destroy(sc->dma_tag);
DEVCFG_SC_UNLOCK(sc);
return (0);
}
static void
zy7_devcfg_intr(void *arg)
{
struct zy7_devcfg_softc *sc = (struct zy7_devcfg_softc *)arg;
uint32_t istatus, imask;
DEVCFG_SC_LOCK(sc);
istatus = RD4(sc, ZY7_DEVCFG_INT_STATUS);
imask = ~RD4(sc, ZY7_DEVCFG_INT_MASK);
/* Turn interrupt off. */
WR4(sc, ZY7_DEVCFG_INT_MASK, ~0);
if ((istatus & imask) == 0) {
DEVCFG_SC_UNLOCK(sc);
return;
}
/* DMA done? */
if ((istatus & ZY7_DEVCFG_INT_DMA_DONE) != 0)
wakeup(sc->dma_map);
/* INIT_B positive edge? */
if ((istatus & ZY7_DEVCFG_INT_PCFG_INIT_PE) != 0)
wakeup(sc);
DEVCFG_SC_UNLOCK(sc);
}
/* zy7_devcfg_sysctl_pl_done() returns status of the PL_DONE signal.
*/
static int
zy7_devcfg_sysctl_pl_done(SYSCTL_HANDLER_ARGS)
{
struct zy7_devcfg_softc *sc = zy7_devcfg_softc_p;
int pl_done = 0;
if (sc) {
DEVCFG_SC_LOCK(sc);
/* PCFG_DONE bit is sticky. Clear it before checking it. */
WR4(sc, ZY7_DEVCFG_INT_STATUS, ZY7_DEVCFG_INT_PCFG_DONE);
pl_done = ((RD4(sc, ZY7_DEVCFG_INT_STATUS) &
ZY7_DEVCFG_INT_PCFG_DONE) != 0);
DEVCFG_SC_UNLOCK(sc);
}
return (sysctl_handle_int(oidp, &pl_done, 0, req));
}
static int
zy7_devcfg_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "xlnx,zy7_devcfg"))
return (ENXIO);
device_set_desc(dev, "Zynq devcfg block");
return (0);
}
static int zy7_devcfg_detach(device_t dev);
static int
zy7_devcfg_attach(device_t dev)
{
struct zy7_devcfg_softc *sc = device_get_softc(dev);
int rid, err;
/* Allow only one attach. */
if (zy7_devcfg_softc_p != NULL)
return (ENXIO);
sc->dev = dev;
DEVCFG_SC_LOCK_INIT(sc);
/* Get memory resource. */
rid = 0;
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->mem_res == NULL) {
device_printf(dev, "could not allocate memory resources.\n");
zy7_devcfg_detach(dev);
return (ENOMEM);
}
/* Allocate IRQ. */
rid = 0;
sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE);
if (sc->irq_res == NULL) {
device_printf(dev, "cannot allocate IRQ\n");
zy7_devcfg_detach(dev);
return (ENOMEM);
}
/* Activate the interrupt. */
err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
NULL, zy7_devcfg_intr, sc, &sc->intrhandle);
if (err) {
device_printf(dev, "cannot setup IRQ\n");
zy7_devcfg_detach(dev);
return (err);
}
/* Create /dev/devcfg */
sc->sc_ctl_dev = make_dev(&zy7_devcfg_cdevsw, 0,
UID_ROOT, GID_WHEEL, 0600, "devcfg");
if (sc->sc_ctl_dev == NULL) {
device_printf(dev, "failed to create /dev/devcfg");
zy7_devcfg_detach(dev);
return (ENXIO);
}
sc->sc_ctl_dev->si_drv1 = sc;
zy7_devcfg_softc_p = sc;
/* Unlock devcfg registers. */
WR4(sc, ZY7_DEVCFG_UNLOCK, ZY7_DEVCFG_UNLOCK_MAGIC);
/* Make sure interrupts are completely disabled. */
WR4(sc, ZY7_DEVCFG_INT_STATUS, ZY7_DEVCFG_INT_ALL);
WR4(sc, ZY7_DEVCFG_INT_MASK, 0xffffffff);
/* Get PS_VERS for SYSCTL. */
zy7_ps_vers = (RD4(sc, ZY7_DEVCFG_MCTRL) &
ZY7_DEVCFG_MCTRL_PS_VERS_MASK) >>
ZY7_DEVCFG_MCTRL_PS_VERS_SHIFT;
return (0);
}
static int
zy7_devcfg_detach(device_t dev)
{
struct zy7_devcfg_softc *sc = device_get_softc(dev);
if (device_is_attached(dev))
bus_generic_detach(dev);
/* Get rid of /dev/devcfg0. */
if (sc->sc_ctl_dev != NULL)
destroy_dev(sc->sc_ctl_dev);
/* Teardown and release interrupt. */
if (sc->irq_res != NULL) {
if (sc->intrhandle)
bus_teardown_intr(dev, sc->irq_res, sc->intrhandle);
bus_release_resource(dev, SYS_RES_IRQ,
rman_get_rid(sc->irq_res), sc->irq_res);
}
/* Release memory resource. */
if (sc->mem_res != NULL)
bus_release_resource(dev, SYS_RES_MEMORY,
rman_get_rid(sc->mem_res), sc->mem_res);
zy7_devcfg_softc_p = NULL;
DEVCFG_SC_LOCK_DESTROY(sc);
return (0);
}
static device_method_t zy7_devcfg_methods[] = {
/* device_if */
DEVMETHOD(device_probe, zy7_devcfg_probe),
DEVMETHOD(device_attach, zy7_devcfg_attach),
DEVMETHOD(device_detach, zy7_devcfg_detach),
DEVMETHOD_END
};
static driver_t zy7_devcfg_driver = {
"zy7_devcfg",
zy7_devcfg_methods,
sizeof(struct zy7_devcfg_softc),
};
static devclass_t zy7_devcfg_devclass;
DRIVER_MODULE(zy7_devcfg, simplebus, zy7_devcfg_driver, zy7_devcfg_devclass, \
0, 0);
MODULE_DEPEND(zy7_devcfg, zy7_slcr, 1, 1, 1);
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