allwinner: Add support for P2WI in RSB driver
Push-Pull Two Wire interface is a almost compatible iic like bus used in sun6i SoC. It's only use is to communicate with the power management IC. Reviewed by: jmcneill MFC after: 1 week Relnotes: yes
This commit is contained in:
Emmanuel Vadot
parent
77e9044c47
commit
cd2b868b5d
@ -27,7 +27,7 @@
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*/
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/*
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* Allwinner RSB (Reduced Serial Bus)
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* Allwinner RSB (Reduced Serial Bus) and P2WI (Push-Pull Two Wire Interface)
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*/
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#include <sys/cdefs.h>
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@ -92,8 +92,12 @@ __FBSDID("$FreeBSD$");
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#define RSB_ADDR_PMIC_SECONDARY 0x745
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#define RSB_ADDR_PERIPH_IC 0xe89
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#define A31_P2WI 1
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#define A23_RSB 2
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static struct ofw_compat_data compat_data[] = {
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{ "allwinner,sun8i-a23-rsb", 1 },
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{ "allwinner,sun6i-a31-p2wi", A31_P2WI },
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{ "allwinner,sun8i-a23-rsb", A23_RSB },
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{ NULL, 0 }
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};
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@ -131,6 +135,7 @@ struct rsb_softc {
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int busy;
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uint32_t status;
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uint16_t cur_addr;
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int type;
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struct iic_msg *msg;
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};
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@ -270,8 +275,8 @@ rsb_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
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sc = device_get_softc(dev);
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/*
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* RSB is not really an I2C or SMBus controller, so there are some
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* restrictions imposed by the driver.
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* P2WI and RSB are not really I2C or SMBus controllers, so there are
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* some restrictions imposed by the driver.
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*
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* Transfers must contain exactly two messages. The first is always
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* a write, containing a single data byte offset. Data will either
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@ -284,34 +289,36 @@ rsb_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
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msgs[0].len != 1 || msgs[1].len > RSB_MAXLEN)
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return (EINVAL);
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/* The controller can read or write 1, 2, or 4 bytes at a time. */
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if ((msgs[1].flags & IIC_M_RD) != 0) {
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switch (msgs[1].len) {
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case 1:
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cmd = CMD_RD8;
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break;
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case 2:
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cmd = CMD_RD16;
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break;
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case 4:
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cmd = CMD_RD32;
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break;
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default:
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return (EINVAL);
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}
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} else {
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switch (msgs[1].len) {
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case 1:
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cmd = CMD_WR8;
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break;
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case 2:
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cmd = CMD_WR16;
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break;
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case 4:
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cmd = CMD_WR32;
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break;
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default:
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return (EINVAL);
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/* The RSB controller can read or write 1, 2, or 4 bytes at a time. */
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if (sc->type == A23_RSB) {
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if ((msgs[1].flags & IIC_M_RD) != 0) {
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switch (msgs[1].len) {
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case 1:
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cmd = CMD_RD8;
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break;
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case 2:
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cmd = CMD_RD16;
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break;
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case 4:
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cmd = CMD_RD32;
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break;
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default:
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return (EINVAL);
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}
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} else {
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switch (msgs[1].len) {
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case 1:
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cmd = CMD_WR8;
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break;
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case 2:
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cmd = CMD_WR16;
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break;
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case 4:
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cmd = CMD_WR32;
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break;
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default:
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return (EINVAL);
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}
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}
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}
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@ -322,13 +329,15 @@ rsb_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
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sc->status = 0;
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/* Select current run-time address if necessary */
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device_addr = msgs[0].slave >> 1;
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if (sc->cur_addr != device_addr) {
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error = rsb_set_rta(dev, device_addr);
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if (error != 0)
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goto done;
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sc->cur_addr = device_addr;
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sc->status = 0;
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if (sc->type == A23_RSB) {
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device_addr = msgs[0].slave >> 1;
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if (sc->cur_addr != device_addr) {
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error = rsb_set_rta(dev, device_addr);
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if (error != 0)
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goto done;
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sc->cur_addr = device_addr;
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sc->status = 0;
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}
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}
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/* Clear interrupt status */
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@ -344,8 +353,9 @@ rsb_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
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RSB_WRITE(sc, RSB_DATA0, data[0]);
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}
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/* Set command type */
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RSB_WRITE(sc, RSB_CMD, cmd);
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/* Set command type for RSB */
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if (sc->type == A23_RSB)
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RSB_WRITE(sc, RSB_CMD, cmd);
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/* Program data length register and transfer direction */
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dlen = msgs[0].len - 1;
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@ -379,10 +389,17 @@ rsb_probe(device_t dev)
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
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case A23_RSB:
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device_set_desc(dev, "Allwinner RSB");
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break;
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case A31_P2WI:
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device_set_desc(dev, "Allwinner P2WI");
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break;
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default:
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return (ENXIO);
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}
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device_set_desc(dev, "Allwinner RSB");
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return (BUS_PROBE_DEFAULT);
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}
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@ -395,6 +412,8 @@ rsb_attach(device_t dev)
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sc = device_get_softc(dev);
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mtx_init(&sc->mtx, device_get_nameunit(dev), "rsb", MTX_DEF);
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sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
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if (clk_get_by_ofw_index(dev, 0, 0, &sc->clk) == 0) {
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error = clk_enable(sc->clk);
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if (error != 0) {
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@ -12,7 +12,7 @@ arm/allwinner/a10_mmc.c optional mmc
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arm/allwinner/a10_sramc.c standard
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arm/allwinner/aw_nmi.c optional intrng
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arm/allwinner/aw_if_dwc.c optional dwc
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arm/allwinner/aw_rsb.c optional rsb
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arm/allwinner/aw_rsb.c optional rsb | p2wi
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arm/allwinner/aw_rtc.c standard
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arm/allwinner/aw_ts.c standard
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arm/allwinner/aw_wdog.c standard
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@ -106,7 +106,8 @@ device psci
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device iicbus
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device iic
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device twsi
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device rsb
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device rsb # Allwinner Reduced Serial Bus
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device p2wi # Allwinner Push-Pull Two Wire
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device axp209 # AXP209 Power Management Unit
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device axp81x # AXP813/818 Power Management Unit
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device bcm2835_bsc
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