Here be a patch to commproc.h. It has structures and other definitions
that are needed in order to implement IDMA transfers. I have not been
able to make use of this myself yet, so use with caution. It does compile
into the kernel ok.
Greg.
--
Index: arch/ppc/8xx_io/commproc.h
===================================================================
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- arch/ppc/8xx_io/commproc.h 2000/04/04 08:43:42 1.3
+++ arch/ppc/8xx_io/commproc.h 2000/04/06 01:02:33 1.4
@@ -14,6 +14,17 @@
* bytes of the DP RAM and relocates the I2C parameter area to the
* IDMA1 space. The remaining DP RAM is available for buffer descriptors
* or other use.
+ *
+ * 2000-03-30 - Added some commands to the 'Some commands' section for
+ * support of IDMA. Replicated some channel numbers for use as IDMA
+ * channel numbers. Added bit masks for the RISC Controller Configuration
+ * Register. Added structure definitions for IDMA parameter RAM and
+ * IDMA buffer descriptors. Added bit field descriptions for IDMA
+ * buffer descriptor status and control register and function code
+ * registers.
+ *
+ * -- Greg (gjohnson at research.canon.com.au)
+ *
*/
#ifndef __CPM_8XX__
#define __CPM_8XX__
@@ -33,16 +44,20 @@
#define CPM_CR_INIT_RX ((ushort)0x0001)
#define CPM_CR_INIT_TX ((ushort)0x0002)
#define CPM_CR_HUNT_MODE ((ushort)0x0003)
+#define CPM_CR_IDMA_INIT ((ushort)0x0005)
#define CPM_CR_STOP_TX ((ushort)0x0004)
#define CPM_CR_RESTART_TX ((ushort)0x0006)
#define CPM_CR_SET_GADDR ((ushort)0x0008)
+#define CPM_CR_IDMA_STOP ((ushort)0x000b)
/* Channel numbers.
*/
#define CPM_CR_CH_SCC1 ((ushort)0x0000)
#define CPM_CR_CH_I2C ((ushort)0x0001) /* I2C and IDMA1 */
+#define CPM_CR_CH_IDMA1 ((ushort)0x0001) /* I2C and IDMA1 */
#define CPM_CR_CH_SCC2 ((ushort)0x0004)
#define CPM_CR_CH_SPI ((ushort)0x0005) /* SPI / IDMA2 / Timers */
+#define CPM_CR_CH_IDMA2 ((ushort)0x0005) /* SPI / IDMA2 / Timers
*/
#define CPM_CR_CH_SCC3 ((ushort)0x0008)
#define CPM_CR_CH_SMC1 ((ushort)0x0009) /* SMC1 / DSP1 */
#define CPM_CR_CH_SCC4 ((ushort)0x000c)
@@ -50,6 +65,17 @@
#define mk_cr_cmd(CH, CMD) ((CMD << 8) | (CH << 4))
+/* CPM RISC Controller Configuration Register */
+#define CPM_RCCR_TIME ((ushort)0x8000) /* Timer enable */
+#define CPM_RCCR_RES ((ushort)0x4000) /* Reserved */
+#define CPM_RCCR_TIMEP ((ushort)0x3f00) /* Timer period */
+#define CPM_RCCR_DR1M ((ushort)0x0080) /* IDMA request 1 mode */
+#define CPM_RCCR_DR0M ((ushort)0x0040) /* IDMA request 0 mode */
+#define CPM_RCCR_DRQP ((ushort)0x0030) /* IDMA emulation req. pri. */
+#define CPM_RCCR_EIE ((ushort)0x0008) /* External interrupt enable */
+#define CPM_RCCR_SCD ((ushort)0x0004) /* Scheduler config. */
+#define CPM_RCCR_ERAM ((ushort)0x0003) /* Enable RAM microcode */
+
/* The dual ported RAM is multi-functional. Some areas can be (and are
* being) used for microcode. There is an area that can only be used
* as data ram for buffer descriptors, which is all we use right now.
@@ -94,8 +120,10 @@
*/
#define PROFF_SCC1 ((uint)0x0000)
#define PROFF_IIC ((uint)0x0080)
+#define PROFF_IDMA1 ((uint)0x00c0)
#define PROFF_SCC2 ((uint)0x0100)
#define PROFF_SPI ((uint)0x0180)
+#define PROFF_IDMA2 ((uint)0x01c0)
#define PROFF_SCC3 ((uint)0x0200)
#define PROFF_SMC1 ((uint)0x0280)
#define PROFF_SCC4 ((uint)0x0300)
@@ -665,6 +693,63 @@
#define SPMODE_EN ((ushort)0x0100) /* Enable */
#define SPMODE_LENMSK ((ushort)0x00f0) /* character length */
#define SPMODE_PMMSK ((ushort)0x000f) /* prescale modulus */
+
+/* IDMA Parameter RAM */
+typedef struct idma_pr
+{
+ uint16_t ipr_ibase; /* Buff. Desc. base address. */
+ uint16_t ipr_dcmr; /* DMA Channel Mode Register. */
+ uint32_t ipr_sapr; /* Internal Use */
+ uint32_t ipr_dapr; /* Internal Use */
+ uint16_t ipr_ibptr; /* Internal Use */
+ uint16_t ipr_write_sp; /* Internal Use */
+ uint32_t ipr_s_byte_c; /* Internal Use */
+ uint32_t ipr_d_byte_c; /* Internal Use */
+ uint32_t ipr_s_state; /* Internal Use */
+ uint32_t ipr_itemp[4]; /* Internal Use */
+ uint32_t ipr_sr_mem; /* Internal Use */
+ uint16_t ipr_read_sp; /* Internal Use */
+ uint16_t ipr_undef_0; /* Internal Use */
+ uint16_t ipr_undef_1; /* Internal Use */
+ uint16_t ipr_undef_2; /* Internal Use */
+ uint32_t ipr_d_state; /* Internal Use */
+} idma_pr_t;
+
+/* IDMA Parameter RAM DCMR Register */
+#define IPR_DCMR_RESERVED ((ushort)0xffe0)
+#define IPR_DCMR_SIZE ((ushort)0x0018) /* Peripheral port size */
+#define IPR_DCMR_SD ((ushort)0x0006) /* Src/Dest Mem/Peripheral */
+#define IPR_DCMR_SINGLE ((ushort)0x0001) /* Single/dual cycle */
+
+/* IDMA Buffer Descriptor. */
+typedef struct idma_bd
+{
+ uint16_t ibd_stat_ctrl; /* Status Control */
+ uint8_t ibd_dfcr; /* Dest. Function Code Reg. */
+ uint8_t ibd_sfcr; /* Src. Function Code Reg. */
+ uint32_t ibd_length; /* Number of bytes to transfer. */
+ uint32_t ibd_source; /* Source Buffer address. */
+ uint32_t ibd_dest; /* Destination Buffer address. */
+} idma_bd_t;
+
+/* IDMA Buff. Desc. Status and Control Register. */
+#define IBD_STCT_VALID ((ushort)0x8000) /* Ready for processing. */
+#define IBD_STCT_RES1 ((ushort)0x4000) /* Reserved */
+#define IBD_STCT_WRAP ((ushort)0x2000) /* Last entry in table. */
+#define IBD_STCT_INTR ((ushort)0x1000) /* Interrupt enable. */
+#define IBD_STCT_LAST ((ushort)0x0800) /* Last. End of buffer chain. */
+#define IBD_STCT_RES2 ((ushort)0x0400) /* Reserved */
+#define IBD_STCT_CONT ((ushort)0x0200) /* Continuous mode */
+#define IBD_STCT_RES3 ((ushort)0x01ff) /* Reserved */
+
+/* IDMA Buff. Desc. Function Code Register. */
+#define IBD_FCR_RES ((unsigned char)0xe0) /* Reserved */
+#define IBD_FCR_BO ((unsigned char)0x18) /* Byte order */
+#define IBD_FCR_AT ((unsigned char)0x07) /* Addr. Type bits [1-3] */
+
+/* IDMA BD FCR Byte Order */
+#define IBD_FCR_PPCLE ((unsigned char)0x08) /* PowerPC Little endian */
+#define IBD_FCR_BETLE ((unsigned char)0x10) /* Big/True_Little endian */
/* CPM interrupts. There are nearly 32 interrupts generated by CPM
* channels or devices. All of these are presented to the PPC core
--
+----------------------------------------------------+
| Do you want to know more? |
| www.geocities --== Greg Johnson ==-- .com/worfsom/ |
| HW/SW Engineer gjohnson at research.canon.com.au |
| Canon Information Systems Research Australia |
| 1 Thomas Holt Dr, North Ryde, NSW, 2113, Australia |
| "I FLEXed my BISON and it went YACC!" - me. |
+----------------------------------------------------+
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
