You've already forked gitified_old_clb_svn
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
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* This work is part of the White Rabbit project
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*
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* Copyright (C) 2013 CERN (www.cern.ch)
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* Author: Wesley W. Terpstra <w.terpstra@gsi.de>
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* Alessandro Rubini <rubini@gnudd.com>
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*
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* Released according to the GNU GPL, version 2 or any later version.
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*/
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#include <string.h>
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#include <etherbone.h>
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#include <w1.h>
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#include <hw/sockit_owm_regs.h>
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extern eb_address_t BASE_ONEWIRE;
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extern eb_device_t device;
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static inline uint32_t __wait_cycle(eb_device_t device)
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{
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eb_data_t data;
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do {
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eb_device_read(device, BASE_ONEWIRE, EB_DATA32|EB_BIG_ENDIAN, &data, 0, 0);
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} while (data & SOCKIT_OWM_CTL_CYC_MSK);
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return data;
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}
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static int w1_reset(struct w1_bus *bus)
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{
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int portnum = bus->detail;
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uint32_t reg;
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eb_data_t data = (portnum << SOCKIT_OWM_CTL_SEL_OFST)
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| (SOCKIT_OWM_CTL_CYC_MSK)
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| (SOCKIT_OWM_CTL_RST_MSK);
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eb_device_write(device, BASE_ONEWIRE, EB_DATA32|EB_BIG_ENDIAN, data, 0, 0);
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reg = __wait_cycle(device);
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/* return presence-detect pulse (1 if true) */
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return (reg & SOCKIT_OWM_CTL_DAT_MSK) ? 0 : 1;
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}
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static int w1_read_bit(struct w1_bus *bus)
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{
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int portnum = bus->detail;
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uint32_t reg;
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eb_data_t data = (portnum << SOCKIT_OWM_CTL_SEL_OFST)
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| (SOCKIT_OWM_CTL_CYC_MSK)
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| (SOCKIT_OWM_CTL_DAT_MSK);
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eb_device_write(device, BASE_ONEWIRE, EB_DATA32|EB_BIG_ENDIAN, data, 0, 0);
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reg = __wait_cycle(device);
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return (reg & SOCKIT_OWM_CTL_DAT_MSK) ? 1 : 0;
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}
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static void w1_write_bit(struct w1_bus *bus, int bit)
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{
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int portnum = bus->detail;
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eb_data_t data = (portnum << SOCKIT_OWM_CTL_SEL_OFST)
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| (SOCKIT_OWM_CTL_CYC_MSK)
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| (bit ? SOCKIT_OWM_CTL_DAT_MSK : 0);
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eb_device_write(device, BASE_ONEWIRE, EB_DATA32|EB_BIG_ENDIAN, data, 0, 0);
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__wait_cycle(device);
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}
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struct w1_ops wrpc_w1_ops = {
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.reset = w1_reset,
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.read_bit = w1_read_bit,
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.write_bit = w1_write_bit,
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};
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struct w1_bus wrpc_w1_bus;
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