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/* $OpenBSD: com_pci.c,v 1.1 2020/03/06 08:39:34 patrick Exp $ */
/*
* Copyright (c) 2020 Patrick Wildt <patrick@blueri.se>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/selinfo.h>
#include <sys/tty.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>
#include <dev/ic/ns16550reg.h>
#define com_usr 31 /* Synopsys DesignWare UART */
/* Intel Low Power Subsystem */
#define LPSS_CLK 0x200
#define LPSS_CLK_GATE (1 << 0)
#define LPSS_CLK_MDIV_SHIFT 1
#define LPSS_CLK_MDIV_MASK 0x3fff
#define LPSS_CLK_NDIV_SHIFT 16
#define LPSS_CLK_NDIV_MASK 0x3fff
#define LPSS_CLK_UPDATE (1U << 31)
#define LPSS_RESETS 0x204
#define LPSS_RESETS_FUNC (3 << 0)
#define LPSS_RESETS_IDMA (1 << 2)
#define LPSS_ACTIVELTR 0x210
#define LPSS_IDLELTR 0x214
#define LPSS_LTR_VALUE_MASK (0x3ff << 0)
#define LPSS_LTR_SCALE_MASK (0x3 << 10)
#define LPSS_LTR_SCALE_1US (2 << 10)
#define LPSS_LTR_SCALE_32US (3 << 10)
#define LPSS_LTR_REQ (1 << 15)
#define LPSS_SSP 0x220
#define LPSS_SSP_DIS_DMA_FIN (1 << 0)
#define LPSS_REMAP_ADDR 0x240
#define LPSS_CAPS 0x2fc
#define LPSS_CAPS_TYPE_I2C (0 << 4)
#define LPSS_CAPS_TYPE_UART (1 << 4)
#define LPSS_CAPS_TYPE_SPI (2 << 4)
#define LPSS_CAPS_TYPE_MASK (0xf << 4)
#define LPSS_CAPS_NO_IDMA (1 << 8)
#define LPSS_REG_OFF 0x200
#define LPSS_REG_SIZE 0x100
#define LPSS_REG_NUM (LPSS_REG_SIZE / sizeof(uint32_t))
#define HREAD4(sc, reg) \
(bus_space_read_4((sc)->sc.sc_iot, (sc)->sc.sc_ioh, (reg)))
#define HWRITE4(sc, reg, val) \
bus_space_write_4((sc)->sc.sc_iot, (sc)->sc.sc_ioh, (reg), (val))
#define HSET4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits))
#define HCLR4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits))
int com_pci_match(struct device *, void *, void *);
void com_pci_attach(struct device *, struct device *, void *);
int com_pci_detach(struct device *, int);
int com_pci_activate(struct device *, int);
int com_pci_intr_designware(void *);
struct com_pci_softc {
struct com_softc sc;
pci_chipset_tag_t sc_pc;
pcireg_t sc_id;
bus_size_t sc_ios;
void *sc_ih;
uint32_t sc_priv[LPSS_REG_NUM];
};
struct cfattach com_pci_ca = {
sizeof(struct com_pci_softc), com_pci_match,
com_pci_attach, com_pci_detach, com_pci_activate,
};
const struct pci_matchid com_pci_ids[] = {
{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_APOLLOLAKE_UART_1 },
{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_APOLLOLAKE_UART_2 },
{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_APOLLOLAKE_UART_3 },
{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_APOLLOLAKE_UART_4 },
};
int
com_pci_match(struct device *parent, void *match, void *aux)
{
return (pci_matchbyid(aux, com_pci_ids, nitems(com_pci_ids)));
}
void
com_pci_attach(struct device *parent, struct device *self, void *aux)
{
struct com_pci_softc *sc = (struct com_pci_softc *)self;
struct pci_attach_args *pa = aux;
pci_intr_handle_t ih;
const char *intrstr;
uint64_t freq, m, n;
uint32_t caps;
sc->sc_pc = pa->pa_pc;
sc->sc_id = pa->pa_id;
sc->sc.sc_frequency = COM_FREQ;
sc->sc.sc_uarttype = COM_UART_16550;
sc->sc.sc_reg_width = 4;
sc->sc.sc_reg_shift = 2;
pci_set_powerstate(pa->pa_pc, pa->pa_tag, PCI_PMCSR_STATE_D0);
if (pci_mapreg_map(pa, PCI_MAPREG_START, PCI_MAPREG_MEM_TYPE_64BIT, 0,
&sc->sc.sc_iot, &sc->sc.sc_ioh, &sc->sc.sc_iobase, &sc->sc_ios, 0)) {
printf(": can't map mem space\n");
return;
}
/*
* Once we are adding non-Intel and non-LPSS device it will make
* sense to add a second table and use pci_matchbyid().
*/
if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_INTEL) {
caps = HREAD4(sc, LPSS_CAPS);
if ((caps & LPSS_CAPS_TYPE_MASK) != LPSS_CAPS_TYPE_UART) {
bus_space_unmap(sc->sc.sc_iot, sc->sc.sc_ioh,
sc->sc_ios);
printf(": not a UART\n");
return;
}
HWRITE4(sc, LPSS_RESETS, 0);
HWRITE4(sc, LPSS_RESETS, LPSS_RESETS_FUNC | LPSS_RESETS_IDMA);
HWRITE4(sc, LPSS_REMAP_ADDR, sc->sc.sc_iobase);
/* 100 MHz base clock */
freq = 100 * 1000 * 1000;
m = n = HREAD4(sc, LPSS_CLK);
m = (m >> LPSS_CLK_MDIV_SHIFT) & LPSS_CLK_MDIV_MASK;
n = (n >> LPSS_CLK_NDIV_SHIFT) & LPSS_CLK_NDIV_MASK;
if (m && n) {
freq *= m;
freq /= n;
}
sc->sc.sc_frequency = freq;
}
if (pci_intr_map_msi(pa, &ih) != 0 && pci_intr_map(pa, &ih) != 0) {
bus_space_unmap(sc->sc.sc_iot, sc->sc.sc_ioh, sc->sc_ios);
printf(": unable to map interrupt\n");
return;
}
intrstr = pci_intr_string(pa->pa_pc, ih);
sc->sc_ih = pci_intr_establish(pa->pa_pc, ih, IPL_TTY,
com_pci_intr_designware, &sc->sc, sc->sc.sc_dev.dv_xname);
if (sc->sc_ih == NULL) {
bus_space_unmap(sc->sc.sc_iot, sc->sc.sc_ioh, sc->sc_ios);
printf(": can't establish interrupt");
if (intrstr != NULL)
printf(" at %s", intrstr);
printf("\n");
return;
}
com_attach_subr(&sc->sc);
}
int
com_pci_detach(struct device *self, int flags)
{
struct com_pci_softc *sc = (struct com_pci_softc *)self;
int rv;
rv = com_detach(self, flags);
if (rv != 0)
return (rv);
if (sc->sc_ih != NULL) {
pci_intr_disestablish(sc->sc_pc, sc->sc_ih);
sc->sc_ih = NULL;
}
if (sc->sc_ios != 0) {
bus_space_unmap(sc->sc.sc_iot, sc->sc.sc_ioh, sc->sc_ios);
sc->sc_ios = 0;
}
return (rv);
}
int
com_pci_activate(struct device *self, int act)
{
struct com_pci_softc *sc = (struct com_pci_softc *)self;
int i, rv = 0;
if (PCI_VENDOR(sc->sc_id) != PCI_VENDOR_INTEL)
return com_activate(self, act);
switch (act) {
case DVACT_RESUME:
for (i = 0; i < LPSS_REG_NUM; i++)
HWRITE4(sc, i * sizeof(uint32_t), sc->sc_priv[i]);
rv = com_activate(self, act);
break;
case DVACT_SUSPEND:
rv = com_activate(self, act);
for (i = 0; i < LPSS_REG_NUM; i++)
sc->sc_priv[i] = HREAD4(sc, i * sizeof(uint32_t));
break;
default:
rv = com_activate(self, act);
break;
}
return (rv);
}
int
com_pci_intr_designware(void *cookie)
{
struct com_softc *sc = cookie;
com_read_reg(sc, com_usr);
return comintr(sc);
}
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