9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
37     if (s->cs & BCM2835_SPI_CS_INTD && s->cs & BCM2835_SPI_CS_DONE) {  in bcm2835_spi_update_int()
41     if (s->cs & BCM2835_SPI_CS_INTR && s->cs & BCM2835_SPI_CS_RXR) {  in bcm2835_spi_update_int()
44     qemu_set_irq(s->irq, do_interrupt);  in bcm2835_spi_update_int()
50     if (!fifo8_is_empty(&s->rx_fifo)) {  in bcm2835_spi_update_rx_flags()
51         s->cs |= BCM2835_SPI_CS_RXD;  in bcm2835_spi_update_rx_flags()
53         s->cs &= ~BCM2835_SPI_CS_RXD;  in bcm2835_spi_update_rx_flags()
57     if (fifo8_is_full(&s->rx_fifo)) {  in bcm2835_spi_update_rx_flags()
58         s->cs |= BCM2835_SPI_CS_RXF;  in bcm2835_spi_update_rx_flags()
60         s->cs &= ~BCM2835_SPI_CS_RXF;  in bcm2835_spi_update_rx_flags()
64     if (fifo8_num_used(&s->rx_fifo) >= FIFO_SIZE_3_4) {  in bcm2835_spi_update_rx_flags()
65         s->cs |= BCM2835_SPI_CS_RXR;  in bcm2835_spi_update_rx_flags()
67         s->cs &= ~BCM2835_SPI_CS_RXR;  in bcm2835_spi_update_rx_flags()
74     if (fifo8_is_full(&s->tx_fifo)) {  in bcm2835_spi_update_tx_flags()
75         s->cs &= ~BCM2835_SPI_CS_TXD;  in bcm2835_spi_update_tx_flags()
77         s->cs |= BCM2835_SPI_CS_TXD;  in bcm2835_spi_update_tx_flags()
81     if (fifo8_is_empty(&s->tx_fifo) && s->cs & BCM2835_SPI_CS_TA) {  in bcm2835_spi_update_tx_flags()
82         s->cs |= BCM2835_SPI_CS_DONE;  in bcm2835_spi_update_tx_flags()
84         s->cs &= ~BCM2835_SPI_CS_DONE;  in bcm2835_spi_update_tx_flags()
92     while (!fifo8_is_empty(&s->tx_fifo) && !fifo8_is_full(&s->rx_fifo)) {  in bcm2835_spi_flush_tx_fifo()
93         tx_byte = fifo8_pop(&s->tx_fifo);  in bcm2835_spi_flush_tx_fifo()
94         rx_byte = ssi_transfer(s->bus, tx_byte);  in bcm2835_spi_flush_tx_fifo()
95         fifo8_push(&s->rx_fifo, rx_byte);  in bcm2835_spi_flush_tx_fifo()
108     case BCM2835_SPI_CS:  in bcm2835_spi_read()
109         readval = s->cs & 0xffffffff;  in bcm2835_spi_read()
111     case BCM2835_SPI_FIFO:  in bcm2835_spi_read()
113         if (s->cs & BCM2835_SPI_CS_RXD) {  in bcm2835_spi_read()
114             readval = fifo8_pop(&s->rx_fifo);  in bcm2835_spi_read()
120     case BCM2835_SPI_CLK:  in bcm2835_spi_read()
121         readval = s->clk & 0xffff;  in bcm2835_spi_read()
123     case BCM2835_SPI_DLEN:  in bcm2835_spi_read()
124         readval = s->dlen & 0xffff;  in bcm2835_spi_read()
126     case BCM2835_SPI_LTOH:  in bcm2835_spi_read()
127         readval = s->ltoh & 0xf;  in bcm2835_spi_read()
129     case BCM2835_SPI_DC:  in bcm2835_spi_read()
130         readval = s->dc & 0xffffffff;  in bcm2835_spi_read()
145     case BCM2835_SPI_CS:  in bcm2835_spi_write()
146         s->cs = (value & ~RO_MASK) | (s->cs & RO_MASK);  in bcm2835_spi_write()
147         if (!(s->cs & BCM2835_SPI_CS_TA)) {  in bcm2835_spi_write()
149             s->cs &= ~(BCM2835_SPI_CS_DONE);  in bcm2835_spi_write()
150             s->cs &= ~(BCM2835_SPI_CS_RXR);  in bcm2835_spi_write()
154         if (s->cs & BCM2835_SPI_CLEAR_RX) {  in bcm2835_spi_write()
155             fifo8_reset(&s->rx_fifo);  in bcm2835_spi_write()
160         if (s->cs & BCM2835_SPI_CLEAR_TX) {  in bcm2835_spi_write()
161             fifo8_reset(&s->tx_fifo);  in bcm2835_spi_write()
166         if (s->cs & BCM2835_SPI_CS_TA) {  in bcm2835_spi_write()
170         if (s->cs & BCM2835_SPI_CS_DMAEN) {  in bcm2835_spi_write()
175         if (s->cs & BCM2835_SPI_CS_LEN) {  in bcm2835_spi_write()
182     case BCM2835_SPI_FIFO:  in bcm2835_spi_write()
187          * use of this and directly modifies the CS and DLEN registers.  in bcm2835_spi_write()
189         if (s->cs & BCM2835_SPI_CS_TA) {  in bcm2835_spi_write()
190             if (s->cs & BCM2835_SPI_CS_TXD) {  in bcm2835_spi_write()
191                 fifo8_push(&s->tx_fifo, value & 0xff);  in bcm2835_spi_write()
199     case BCM2835_SPI_CLK:  in bcm2835_spi_write()
200         s->clk = value & 0xffff;  in bcm2835_spi_write()
202     case BCM2835_SPI_DLEN:  in bcm2835_spi_write()
203         s->dlen = value & 0xffff;  in bcm2835_spi_write()
205     case BCM2835_SPI_LTOH:  in bcm2835_spi_write()
206         s->ltoh = value & 0xf;  in bcm2835_spi_write()
208     case BCM2835_SPI_DC:  in bcm2835_spi_write()
209         s->dc = value & 0xffffffff;  in bcm2835_spi_write()
226     s->bus = ssi_create_bus(dev, "spi");  in bcm2835_spi_realize()
228     memory_region_init_io(&s->iomem, OBJECT(dev), &bcm2835_spi_ops, s,  in bcm2835_spi_realize()
230     sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);  in bcm2835_spi_realize()
231     sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq);  in bcm2835_spi_realize()
233     fifo8_create(&s->tx_fifo, FIFO_SIZE);  in bcm2835_spi_realize()
234     fifo8_create(&s->rx_fifo, FIFO_SIZE);  in bcm2835_spi_realize()
240     fifo8_reset(&s->tx_fifo);  in bcm2835_spi_reset()
241     fifo8_reset(&s->rx_fifo);  in bcm2835_spi_reset()
244     s->cs = BCM2835_SPI_CS_TXD | BCM2835_SPI_CS_REN;  in bcm2835_spi_reset()
245     s->clk = 0;  in bcm2835_spi_reset()
246     s->dlen = 0;  in bcm2835_spi_reset()
247     s->ltoh = 0x1;  in bcm2835_spi_reset()
248     s->dc = 0x30201020;  in bcm2835_spi_reset()
272     dc->realize = bcm2835_spi_realize;  in bcm2835_spi_class_init()
273     dc->vmsd = &vmstate_bcm2835_spi;  in bcm2835_spi_class_init()