2  * LocalPlus Bus FIFO driver for the Freescale MPC52xx.
28 MODULE_DESCRIPTION("MPC5200 LocalPlus FIFO device driver");
57 /* The MPC5200 has only one fifo, so only need one instance structure */
81 		/* While the FIFO can be setup for transfer sizes as large as  in mpc52xx_lpbfifo_kick()
82 		 * 16M-1, the FIFO itself is only 512 bytes deep and it does  in mpc52xx_lpbfifo_kick()
83 		 * not generate interrupts for FIFO full events (only transfer  in mpc52xx_lpbfifo_kick()
85 		 * Bestcomm to drive the FIFO it needs to either be polled, or  in mpc52xx_lpbfifo_kick()
86 		 * transfers need to constrained to the size of the fifo.  in mpc52xx_lpbfifo_kick()
93 		/* Load the FIFO with data */  in mpc52xx_lpbfifo_kick()
141 			 * work, just increase the number of bytes the FIFO is  in mpc52xx_lpbfifo_kick()
144 			 * When submitting another operation, the FIFO will get  in mpc52xx_lpbfifo_kick()
145 			 * reset, so the condition of the FIFO waiting for a  in mpc52xx_lpbfifo_kick()
179  * mpc52xx_lpbfifo_irq - IRQ handler for LPB FIFO
181  * On transmit, the dma completion irq triggers before the fifo completion
182  * triggers.  Handle the dma completion here instead of the LPB FIFO Bestcomm
183  * task completion irq because everything is not really done until the LPB FIFO
188  * transmit, the fifo completion irq is the "Fat Lady". The opera (or in this
189  * case the DMA/FIFO operation) is not finished until the "Fat Lady" sings.
198  * 2) FIFO complete without DMA; more data to do
199  * 3) FIFO complete without DMA; all data transferred
200  * 4) FIFO complete using DMA
206  * Condition 2 requires programming the FIFO with the next block of data
267 		/* copy the data out of the FIFO */  in mpc52xx_lpbfifo_irq()
289 		 * Count the DMA as complete only when the FIFO completion  in mpc52xx_lpbfifo_irq()
303 	 * so set the FIFO as idle */  in mpc52xx_lpbfifo_irq()
321  * mpc52xx_lpbfifo_bcom_irq - IRQ handler for LPB FIFO Bestcomm task
360 	/* Mark the FIFO as idle */  in mpc52xx_lpbfifo_bcom_irq()
393  * mpc52xx_lpbfifo_submit - Submit an LPB FIFO transfer request.
461 	/* Put FIFO into reset */  in mpc52xx_lpbfifo_probe()
470 	/* Request the Bestcomm receive (fifo --> memory) task and IRQ */  in mpc52xx_lpbfifo_probe()
486 	/* Request the Bestcomm transmit (memory --> fifo) task and IRQ */  in mpc52xx_lpbfifo_probe()
515 	/* Put FIFO in reset */  in mpc52xx_lpbfifo_remove()