// license:BSD-3-Clause // copyright-holders:Angelo Salese /************************************************************************************************** SiS 950 SMBus implementation TODO: - Stub, needs an smbus_interface, bare minimum to make shutms11 happy; **************************************************************************************************/ #include "emu.h" #include "sis950_smbus.h" #define LOG_CMD (1U << 1) // log commands #define VERBOSE (LOG_GENERAL | LOG_CMD) //#define LOG_OUTPUT_FUNC osd_printf_warning #include "logmacro.h" #define LOGCMD(...) LOGMASKED(LOG_CMD, __VA_ARGS__) DEFINE_DEVICE_TYPE(SIS950_SMBUS, sis950_smbus_device, "sis950_smbus", "SiS950 SMBus interface") void sis950_smbus_device::map(address_map &map) { map(0x00, 0x00).rw(FUNC(sis950_smbus_device::smb_sts_r), FUNC(sis950_smbus_device::smb_sts_w)); map(0x03, 0x03).rw(FUNC(sis950_smbus_device::smbhost_cnt_r), FUNC(sis950_smbus_device::smbhost_cnt_w)); #if 0 map(0x02, 0x02).rw(FUNC(sis950_smbus_device::hst_cnt_r), FUNC(sis950_smbus_device::hst_cnt_w)); map(0x03, 0x03).rw(FUNC(sis950_smbus_device::hst_cmd_r), FUNC(sis950_smbus_device::hst_cmd_w)); map(0x04, 0x04).rw(FUNC(sis950_smbus_device::xmit_slva_r), FUNC(sis950_smbus_device::xmit_slva_w)); map(0x05, 0x05).rw(FUNC(sis950_smbus_device::hst_d0_r), FUNC(sis950_smbus_device::hst_d0_w)); map(0x06, 0x06).rw(FUNC(sis950_smbus_device::hst_d1_r), FUNC(sis950_smbus_device::hst_d1_w)); map(0x07, 0x07).rw(FUNC(sis950_smbus_device::host_block_db_r), FUNC(sis950_smbus_device::host_block_db_w)); map(0x08, 0x08).rw(FUNC(sis950_smbus_device::pec_r), FUNC(sis950_smbus_device::pec_w)); map(0x09, 0x09).rw(FUNC(sis950_smbus_device::rcv_slva_r), FUNC(sis950_smbus_device::rcv_slva_w)); map(0x0a, 0x0b).rw(FUNC(sis950_smbus_device::slv_data_r), FUNC(sis950_smbus_device::slv_data_w)); map(0x0c, 0x0c).rw(FUNC(sis950_smbus_device::aux_sts_r), FUNC(sis950_smbus_device::aux_sts_w)); map(0x0d, 0x0d).rw(FUNC(sis950_smbus_device::aux_ctl_r), FUNC(sis950_smbus_device::aux_ctl_w)); map(0x0e, 0x0e).rw(FUNC(sis950_smbus_device::smlink_pin_ctl_r), FUNC(sis950_smbus_device::smlink_pin_ctl_w)); map(0x0f, 0x0f).rw(FUNC(sis950_smbus_device::smbus_pin_ctl_r), FUNC(sis950_smbus_device::smbus_pin_ctl_w)); map(0x10, 0x10).rw(FUNC(sis950_smbus_device::slv_sts_r), FUNC(sis950_smbus_device::slv_sts_w)); map(0x11, 0x11).rw(FUNC(sis950_smbus_device::slv_cmd_r), FUNC(sis950_smbus_device::slv_cmd_w)); map(0x14, 0x14).r(FUNC(sis950_smbus_device::notify_daddr_r)); map(0x16, 0x16).r(FUNC(sis950_smbus_device::notify_dlow_r)); map(0x17, 0x17).r(FUNC(sis950_smbus_device::notify_dhigh_r)); #endif } sis950_smbus_device::sis950_smbus_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, SIS950_SMBUS, tag, owner, clock) { } void sis950_smbus_device::device_start() { } void sis950_smbus_device::device_reset() { } u8 sis950_smbus_device::smb_sts_r() { LOGCMD("%s: smb_sts_r (%02x)\n", tag(), m_status); return m_status; } void sis950_smbus_device::smb_sts_w(u8 data) { m_status &= ~data; LOGCMD("%s: smb_sts_w = %02x\n", tag(), data); } // reads back bits 0-2 only u8 sis950_smbus_device::smbhost_cnt_r() { return m_cmd; } /* * --x- ---- kill (reset state, TODO) * ---x ---- start transaction * ---- -xxx command protocol * ---- -000 quick command * ---- -001 send/receive byte * ---- -010 read/write byte data * ---- -011 read/write word data * ---- -100 process call * ---- -101 read/write block data * ---- -11x */ void sis950_smbus_device::smbhost_cnt_w(u8 data) { m_cmd = data & 7; LOGCMD("%s: smbhost_cnt_w = %02x\n", tag(), data); // TODO: process commands properly // For now we just reflect shutms11 wanting bit 3 on after each transaction if (BIT(data, 4)) m_status |= 8; }