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57 #include "unsolicited_frame_control.h"
58 #include "registers.h"
60 int sci_unsolicited_frame_control_construct(struct isci_host *ihost)
62 struct sci_unsolicited_frame_control *uf_control = &ihost->uf_control;
63 struct sci_unsolicited_frame *uf;
64 u32 buf_len, header_len, i;
70 * Prepare all of the memory sizes for the UF headers, UF address
71 * table, and UF buffers themselves.
73 buf_len = SCU_MAX_UNSOLICITED_FRAMES * SCU_UNSOLICITED_FRAME_BUFFER_SIZE;
74 header_len = SCU_MAX_UNSOLICITED_FRAMES * sizeof(struct scu_unsolicited_frame_header);
75 size = buf_len + header_len + SCU_MAX_UNSOLICITED_FRAMES * sizeof(dma_addr_t);
78 * The Unsolicited Frame buffers are set at the start of the UF
79 * memory descriptor entry. The headers and address table will be
80 * placed after the buffers.
82 virt = dmam_alloc_coherent(&ihost->pdev->dev, size, &dma, GFP_KERNEL);
87 * Program the location of the UF header table into the SCU.
89 * - The address must align on a 64-byte boundary. Guaranteed to be
90 * on 64-byte boundary already 1KB boundary for unsolicited frames.
91 * - Program unused header entries to overlap with the last
92 * unsolicited frame. The silicon will never DMA to these unused
93 * headers, since we program the UF address table pointers to
96 uf_control->headers.physical_address = dma + buf_len;
97 uf_control->headers.array = virt + buf_len;
100 * Program the location of the UF address table into the SCU.
102 * - The address must align on a 64-bit boundary. Guaranteed to be on 64
103 * byte boundary already due to above programming headers being on a
104 * 64-bit boundary and headers are on a 64-bytes in size.
106 uf_control->address_table.physical_address = dma + buf_len + header_len;
107 uf_control->address_table.array = virt + buf_len + header_len;
111 * UF buffer requirements are:
112 * - The last entry in the UF queue is not NULL.
113 * - There is a power of 2 number of entries (NULL or not-NULL)
114 * programmed into the queue.
115 * - Aligned on a 1KB boundary. */
118 * Program the actual used UF buffers into the UF address table and
119 * the controller's array of UFs.
121 for (i = 0; i < SCU_MAX_UNSOLICITED_FRAMES; i++) {
122 uf = &uf_control->buffers.array[i];
124 uf_control->address_table.array[i] = dma;
127 uf->header = &uf_control->headers.array[i];
128 uf->state = UNSOLICITED_FRAME_EMPTY;
131 * Increment the address of the physical and virtual memory
132 * pointers. Everything is aligned on 1k boundary with an
135 virt += SCU_UNSOLICITED_FRAME_BUFFER_SIZE;
136 dma += SCU_UNSOLICITED_FRAME_BUFFER_SIZE;
142 enum sci_status sci_unsolicited_frame_control_get_header(struct sci_unsolicited_frame_control *uf_control,
146 if (frame_index < SCU_MAX_UNSOLICITED_FRAMES) {
147 /* Skip the first word in the frame since this is a controll word used
150 *frame_header = &uf_control->buffers.array[frame_index].header->data;
155 return SCI_FAILURE_INVALID_PARAMETER_VALUE;
158 enum sci_status sci_unsolicited_frame_control_get_buffer(struct sci_unsolicited_frame_control *uf_control,
162 if (frame_index < SCU_MAX_UNSOLICITED_FRAMES) {
163 *frame_buffer = uf_control->buffers.array[frame_index].buffer;
168 return SCI_FAILURE_INVALID_PARAMETER_VALUE;
171 bool sci_unsolicited_frame_control_release_frame(struct sci_unsolicited_frame_control *uf_control,
177 frame_get = uf_control->get & (SCU_MAX_UNSOLICITED_FRAMES - 1);
178 frame_cycle = uf_control->get & SCU_MAX_UNSOLICITED_FRAMES;
181 * In the event there are NULL entries in the UF table, we need to
182 * advance the get pointer in order to find out if this frame should
183 * be released (i.e. update the get pointer)
185 while (lower_32_bits(uf_control->address_table.array[frame_get]) == 0 &&
186 upper_32_bits(uf_control->address_table.array[frame_get]) == 0 &&
187 frame_get < SCU_MAX_UNSOLICITED_FRAMES)
191 * The table has a NULL entry as it's last element. This is
194 BUG_ON(frame_get >= SCU_MAX_UNSOLICITED_FRAMES);
195 if (frame_index >= SCU_MAX_UNSOLICITED_FRAMES)
198 uf_control->buffers.array[frame_index].state = UNSOLICITED_FRAME_RELEASED;
200 if (frame_get != frame_index) {
202 * Frames remain in use until we advance the get pointer
203 * so there is nothing we can do here
209 * The frame index is equal to the current get pointer so we
210 * can now free up all of the frame entries that
212 while (uf_control->buffers.array[frame_get].state == UNSOLICITED_FRAME_RELEASED) {
213 uf_control->buffers.array[frame_get].state = UNSOLICITED_FRAME_EMPTY;
215 if (frame_get+1 == SCU_MAX_UNSOLICITED_FRAMES-1) {
216 frame_cycle ^= SCU_MAX_UNSOLICITED_FRAMES;
222 uf_control->get = SCU_UFQGP_GEN_BIT(ENABLE_BIT) | frame_cycle | frame_get;