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NetBSD/sys/dev/pci/voyager.c

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/* $NetBSD: voyager.c,v 1.9 2012/01/30 19:41:23 drochner Exp $ */
/*
* Copyright (c) 2009, 2011 Michael Lorenz
* 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 ``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 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: voyager.c,v 1.9 2012/01/30 19:41:23 drochner Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/lwp.h>
#include <sys/kauth.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/pciio.h>
#include <dev/ic/sm502reg.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/i2c_bitbang.h>
#include <sys/evcnt.h>
#include <sys/bitops.h>
#include <dev/pci/voyagervar.h>
#include "opt_voyager.h"
#include "voyagerfb.h"
#include "pwmclock.h"
#ifdef VOYAGER_DEBUG
#define DPRINTF aprint_normal
#else
#define DPRINTF while (0) printf
#endif
/* interrupt stuff */
struct voyager_intr {
int (*vih_func)(void *);
void *vih_arg;
struct evcnt vih_count;
char vih_name[32];
};
struct voyager_softc {
device_t sc_dev;
pci_chipset_tag_t sc_pc;
pcitag_t sc_pcitag;
bus_space_tag_t sc_memt;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_fbh, sc_regh;
bus_addr_t sc_fb, sc_reg;
bus_size_t sc_fbsize, sc_regsize;
struct i2c_controller sc_i2c;
kmutex_t sc_i2c_lock;
/* interrupt dispatcher */
void *sc_ih;
struct voyager_intr sc_intrs[32];
};
static int voyager_match(device_t, cfdata_t, void *);
static void voyager_attach(device_t, device_t, void *);
static int voyager_print(void *, const char *);
static int voyager_intr(void *);
CFATTACH_DECL_NEW(voyager, sizeof(struct voyager_softc),
voyager_match, voyager_attach, NULL, NULL);
/* I2C glue */
static int voyager_i2c_acquire_bus(void *, int);
static void voyager_i2c_release_bus(void *, int);
static int voyager_i2c_send_start(void *, int);
static int voyager_i2c_send_stop(void *, int);
static int voyager_i2c_initiate_xfer(void *, i2c_addr_t, int);
static int voyager_i2c_read_byte(void *, uint8_t *, int);
static int voyager_i2c_write_byte(void *, uint8_t, int);
/* I2C bitbang glue */
static void voyager_i2cbb_set_bits(void *, uint32_t);
static void voyager_i2cbb_set_dir(void *, uint32_t);
static uint32_t voyager_i2cbb_read(void *);
static const struct i2c_bitbang_ops voyager_i2cbb_ops = {
voyager_i2cbb_set_bits,
voyager_i2cbb_set_dir,
voyager_i2cbb_read,
{
1 << 13,
1 << 6,
1 << 13,
0
}
};
#define GPIO_I2C_BITS ((1 << 6) | (1 << 13))
#ifdef VOYAGER_DEBUG
static void voyager_print_pwm(struct voyager_softc *, int);
#endif
static int
voyager_match(device_t parent, cfdata_t match, void *aux)
{
struct pci_attach_args *pa = (struct pci_attach_args *)aux;
if (PCI_CLASS(pa->pa_class) != PCI_CLASS_DISPLAY)
return 0;
if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_SILMOTION)
return 0;
/* only chip tested on so far - may need a list */
if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_SILMOTION_SM502)
return 100;
return (0);
}
static void
voyager_attach(device_t parent, device_t self, void *aux)
{
struct voyager_softc *sc = device_private(self);
struct pci_attach_args *pa = aux;
pci_intr_handle_t ih;
struct voyager_attach_args vaa;
struct i2cbus_attach_args iba;
uint32_t reg;
const char *intrstr;
int i;
sc->sc_pc = pa->pa_pc;
sc->sc_pcitag = pa->pa_tag;
sc->sc_memt = pa->pa_memt;
sc->sc_iot = pa->pa_iot;
sc->sc_dev = self;
pci_aprint_devinfo(pa, NULL);
if (pci_mapreg_map(pa, 0x14, PCI_MAPREG_TYPE_MEM, 0,
&sc->sc_memt, &sc->sc_regh, &sc->sc_reg, &sc->sc_regsize)) {
aprint_error("%s: failed to map registers.\n",
device_xname(sc->sc_dev));
}
if (pci_mapreg_map(pa, 0x10, PCI_MAPREG_TYPE_MEM,
BUS_SPACE_MAP_LINEAR,
&sc->sc_memt, &sc->sc_fbh, &sc->sc_fb, &sc->sc_fbsize)) {
aprint_error("%s: failed to map the frame buffer.\n",
device_xname(sc->sc_dev));
}
/* disable all interrupts */
bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_INTR_MASK, 0);
/* initialize handler list */
for (i = 0; i < 32; i++) {
sc->sc_intrs[i].vih_func = NULL;
snprintf(sc->sc_intrs[i].vih_name, 32, "int %d", i);
evcnt_attach_dynamic(&sc->sc_intrs[i].vih_count,
EVCNT_TYPE_INTR, NULL, "voyager", sc->sc_intrs[i].vih_name);
}
/* Map and establish the interrupt. */
if (pci_intr_map(pa, &ih)) {
aprint_error_dev(self, "couldn't map interrupt\n");
return;
}
intrstr = pci_intr_string(sc->sc_pc, ih);
sc->sc_ih = pci_intr_establish(sc->sc_pc, ih, IPL_AUDIO, voyager_intr, sc);
if (sc->sc_ih == NULL) {
aprint_error_dev(self, "couldn't establish interrupt");
if (intrstr != NULL)
aprint_error(" at %s", intrstr);
aprint_error("\n");
return;
}
aprint_normal_dev(self, "interrupting at %s\n", intrstr);
#ifdef VOYAGER_DEBUG
voyager_print_pwm(sc, SM502_PWM0);
voyager_print_pwm(sc, SM502_PWM1);
voyager_print_pwm(sc, SM502_PWM2);
#endif
/* attach the framebuffer driver */
vaa.vaa_memh = sc->sc_fbh;
vaa.vaa_mem_pa = sc->sc_fb;
vaa.vaa_regh = sc->sc_regh;
vaa.vaa_reg_pa = sc->sc_reg;
vaa.vaa_tag = sc->sc_memt;
vaa.vaa_pc = sc->sc_pc;
vaa.vaa_pcitag = sc->sc_pcitag;
#if NVOYAGERFB > 0
strcpy(vaa.vaa_name, "voyagerfb");
config_found_ia(sc->sc_dev, "voyagerbus", &vaa, voyager_print);
#endif
#if NPWMCLOCK > 0
strcpy(vaa.vaa_name, "pwmclock");
config_found_ia(sc->sc_dev, "voyagerbus", &vaa, voyager_print);
#endif
#ifdef notyet
strcpy(vaa.vaa_name, "vac");
config_found_ia(sc->sc_dev, "voyagerbus", &vaa, voyager_print);
#endif
/* we use this mutex wether there's an i2c bus or not */
mutex_init(&sc->sc_i2c_lock, MUTEX_DEFAULT, IPL_NONE);
/*
* see if the i2c pins are configured as gpio and if so, use them
* should probably be a compile time option
*/
reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_GPIO0_CONTROL);
if ((reg & GPIO_I2C_BITS) == 0) {
/* both bits as outputs */
voyager_gpio_dir(sc, 0xffffffff, GPIO_I2C_BITS);
/* Fill in the i2c tag */
sc->sc_i2c.ic_cookie = sc;
sc->sc_i2c.ic_acquire_bus = voyager_i2c_acquire_bus;
sc->sc_i2c.ic_release_bus = voyager_i2c_release_bus;
sc->sc_i2c.ic_send_start = voyager_i2c_send_start;
sc->sc_i2c.ic_send_stop = voyager_i2c_send_stop;
sc->sc_i2c.ic_initiate_xfer = voyager_i2c_initiate_xfer;
sc->sc_i2c.ic_read_byte = voyager_i2c_read_byte;
sc->sc_i2c.ic_write_byte = voyager_i2c_write_byte;
sc->sc_i2c.ic_exec = NULL;
iba.iba_tag = &sc->sc_i2c;
config_found_ia(self, "i2cbus", &iba, iicbus_print);
}
voyager_control_gpio(sc, ~(1 << 16), 0);
voyager_gpio_dir(sc, 0xffffffff, 1 << 16);
voyager_write_gpio(sc, 0xffffffff, 1 << 16);
}
static int
voyager_print(void *aux, const char *what)
{
/*struct voyager_attach_args *vaa = aux;*/
if (what == NULL)
return 0;
printf("%s:", what);
return 0;
}
static void
voyager_i2cbb_set_bits(void *cookie, uint32_t bits)
{
struct voyager_softc *sc = cookie;
uint32_t reg;
reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_GPIO_DATA0);
reg &= ~GPIO_I2C_BITS;
reg |= bits;
bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_GPIO_DATA0, reg);
}
static void
voyager_i2cbb_set_dir(void *cookie, uint32_t bits)
{
struct voyager_softc *sc = cookie;
uint32_t reg;
reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_GPIO_DIR0);
reg &= ~(1 << 13);
reg |= bits;
bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_GPIO_DIR0, reg);
}
static uint32_t
voyager_i2cbb_read(void *cookie)
{
struct voyager_softc *sc = cookie;
uint32_t reg;
reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_GPIO_DATA0);
return reg;
}
/* higher level I2C stuff */
static int
voyager_i2c_acquire_bus(void *cookie, int flags)
{
struct voyager_softc *sc = cookie;
mutex_enter(&sc->sc_i2c_lock);
return 0;
}
static void
voyager_i2c_release_bus(void *cookie, int flags)
{
struct voyager_softc *sc = cookie;
mutex_exit(&sc->sc_i2c_lock);
}
static int
voyager_i2c_send_start(void *cookie, int flags)
{
return (i2c_bitbang_send_start(cookie, flags, &voyager_i2cbb_ops));
}
static int
voyager_i2c_send_stop(void *cookie, int flags)
{
return (i2c_bitbang_send_stop(cookie, flags, &voyager_i2cbb_ops));
}
static int
voyager_i2c_initiate_xfer(void *cookie, i2c_addr_t addr, int flags)
{
/*
* for some reason i2c_bitbang_initiate_xfer left-shifts
* the I2C-address and then sets the direction bit
*/
return (i2c_bitbang_initiate_xfer(cookie, addr, flags,
&voyager_i2cbb_ops));
}
static int
voyager_i2c_read_byte(void *cookie, uint8_t *valp, int flags)
{
int ret;
ret = i2c_bitbang_read_byte(cookie, valp, flags, &voyager_i2cbb_ops);
return ret;
}
static int
voyager_i2c_write_byte(void *cookie, uint8_t val, int flags)
{
int ret;
ret = i2c_bitbang_write_byte(cookie, val, flags, &voyager_i2cbb_ops);
delay(500);
return ret;
}
void
voyager_twiddle_bits(void *cookie, int regnum, uint32_t mask, uint32_t bits)
{
struct voyager_softc *sc = cookie;
uint32_t reg;
/* don't interfere with i2c ops */
mutex_enter(&sc->sc_i2c_lock);
reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, regnum);
reg &= mask;
reg |= bits;
bus_space_write_4(sc->sc_memt, sc->sc_regh, regnum, reg);
mutex_exit(&sc->sc_i2c_lock);
}
static int
voyager_intr(void *cookie)
{
struct voyager_softc *sc = cookie;
struct voyager_intr *ih;
uint32_t intrs;
uint32_t mask, bit;
int num;
intrs = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_INTR_STATUS);
mask = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_INTR_MASK);
intrs &= mask;
while (intrs != 0) {
num = ffs32(intrs) - 1;
bit = 1 << num;
intrs &= ~bit;
ih = &sc->sc_intrs[num];
if (ih->vih_func != NULL) {
ih->vih_func(ih->vih_arg);
}
ih->vih_count.ev_count++;
}
return 0;
}
void *
voyager_establish_intr(device_t dev, int bit, int (*handler)(void *), void *arg)
{
struct voyager_softc *sc = device_private(dev);
struct voyager_intr *ih;
uint32_t reg;
if ((bit < 0) || (bit > 31)) {
aprint_error_dev(dev, "bogus interrupt %d\n", bit);
return NULL;
}
ih = &sc->sc_intrs[bit];
if (ih->vih_func != NULL) {
aprint_error_dev(dev, "interrupt %d is already in use\n", bit);
return NULL;
}
ih->vih_func = handler;
ih->vih_arg = arg;
reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_INTR_MASK);
reg |= 1 << bit;
bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_INTR_MASK, reg);
return (void *)(uintptr_t)(0x80000000 | bit);
}
void
voyager_disestablish_intr(device_t dev, void *ih)
{
}
/* timer */
#ifdef VOYAGER_DEBUG
static void
voyager_print_pwm(struct voyager_softc *sc, int pwmreg)
{
uint32_t reg;
reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, pwmreg);
aprint_debug_dev(sc->sc_dev, "%08x: %08x = %d Hz, %d high, %d low\n",
pwmreg, reg,
96000000 / (1 << ((reg & SM502_PWM_CLOCK_DIV_MASK) >> SM502_PWM_CLOCK_DIV_SHIFT)),
(reg & SM502_PWM_CLOCK_HIGH_MASK) >> SM502_PWM_CLOCK_HIGH_SHIFT,
(reg & SM502_PWM_CLOCK_LOW_MASK) >> SM502_PWM_CLOCK_LOW_SHIFT);
}
#endif
uint32_t
voyager_set_pwm(int freq, int duty_cycle)
{
int ifreq, factor, bit, steps;
uint32_t reg = 0, hi, lo;
/*
* find the smallest divider that gets us within 4096 steps of the
* target frequency
*/
ifreq = freq * 4096;
factor = 96000000 / ifreq;
bit = fls32(factor);
factor = 1 << bit;
steps = 96000000 / (factor * freq);
/* can't have it all off */
if (duty_cycle < 1)
duty_cycle = 1;
/* can't be always on either */
if (duty_cycle > 999)
duty_cycle = 999;
hi = steps * duty_cycle / 1000;
if (hi < 1)
hi = 1;
lo = steps - hi;
if (lo < 1) {
hi = steps - 1;
lo = 1;
}
DPRINTF("%d hz -> %d, %d, %d / %d\n", freq, factor, steps, lo, hi);
reg = ((hi - 1) & 0xfff) << SM502_PWM_CLOCK_HIGH_SHIFT;
reg |= ((lo - 1) & 0xfff) << SM502_PWM_CLOCK_LOW_SHIFT;
reg |= (bit & 0xf) << SM502_PWM_CLOCK_DIV_SHIFT;
DPRINTF("reg: %08x\n", reg);
return reg;
}
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