cvmx-dfa.c revision 215990 
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44
45
46/**
47 * @file
48 *
49 * Support library for the CN31XX, CN38XX, and CN58XX hardware DFA engine.
50 *
51 * <hr>$Revision: 49448 $<hr>
52 */
53#include "executive-config.h"
54#ifdef CVMX_ENABLE_DFA_FUNCTIONS
55
56#include "cvmx-config.h"
57#include "cvmx.h"
58#include "cvmx-fau.h"
59#include "cvmx-dfa.h"
60
61
62
63/**
64 * Initialize the DFA hardware before use
65 */
66int cvmx_dfa_initialize(void)
67{
68    cvmx_dfa_difctl_t control;
69    void *initial_base_address;
70    cvmx_dfa_state_t initial_state;
71    if (!octeon_has_feature(OCTEON_FEATURE_DFA))
72    {
73        cvmx_dprintf("ERROR: attempting to initialize DFA when no DFA hardware present\n.");
74        return -1;
75    }
76
77    control.u64 = 0;
78    control.s.dwbcnt = CVMX_FPA_DFA_POOL_SIZE / 128;
79    control.s.pool = CVMX_FPA_DFA_POOL;
80    control.s.size = (CVMX_FPA_DFA_POOL_SIZE - 8) / sizeof(cvmx_dfa_command_t);
81    CVMX_SYNCWS;
82    cvmx_write_csr(CVMX_DFA_DIFCTL, control.u64);
83
84    initial_base_address = cvmx_fpa_alloc(CVMX_FPA_DFA_POOL);
85
86    initial_state.u64 = 0;
87    initial_state.s.base_address_div16 = (CAST64(initial_base_address))/16;
88    cvmx_fau_atomic_write64(CVMX_FAU_DFA_STATE, initial_state.u64);
89
90    CVMX_SYNCWS;
91    cvmx_write_csr(CVMX_DFA_DIFRDPTR, cvmx_ptr_to_phys(initial_base_address));
92
93    return 0;
94}
95
96
97/**
98 * Shutdown and cleanup resources used by the DFA
99 */
100void cvmx_dfa_shutdown(void)
101{
102    void *final_base_address;
103    cvmx_dfa_state_t final_state;
104
105    CVMX_SYNCWS;
106
107    final_state.u64 = cvmx_fau_fetch_and_add64(CVMX_FAU_DFA_STATE, 0);
108
109    // make sure the carry is clear
110    final_base_address = CASTPTR(void, (final_state.s2.base_address_div32 * 32ull));
111
112    if (final_base_address)
113    {
114        cvmx_fpa_free(final_base_address, CVMX_FPA_DFA_POOL, 0);
115    }
116
117    CVMX_SYNCWS;
118    final_state.u64 = 0;
119    cvmx_fau_atomic_write64(CVMX_FAU_DFA_STATE, final_state.u64);
120}
121
122#endif
123