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Subject[RFC PATCH 1/5] RFC: msm: sps: Bus Access Manager (BAM) Hardware driver
Date
From: Amir Samuelovi <amirs@codeaurora.org>

A primary component of the Smart Peripheral Subsytem (SPS) is the Bus
Access Manager (BAM). The BAM serves as a DMA engine for a peripheral
core. A BAM can provide multiple DMA channels, referred to as "pipes",
which can perform DMA between other BAM pipes or to system memory under
control of a host CPU.

The BAM driver handles the following:
- BAM and endpoint hardware configuration
- BAM interrupt routing and dispatching

Signed-off-by: Amir Samuelov <amirs@codeaurora.org>
Signed-off-by: Kenneth Heitke <kheitke@codeaurora.org>
---
arch/arm/mach-msm/sps/bam.c | 588 +++++++++++++++++++++++++++++++++++++++++++
arch/arm/mach-msm/sps/bam.h | 375 +++++++++++++++++++++++++++
2 files changed, 963 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-msm/sps/bam.c
create mode 100644 arch/arm/mach-msm/sps/bam.h
diff --git a/arch/arm/mach-msm/sps/bam.c b/arch/arm/mach-msm/sps/bam.c
new file mode 100644
index 0000000..be6b038
--- /dev/null
+++ b/arch/arm/mach-msm/sps/bam.c
@@ -0,0 +1,588 @@
+/* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/* Bus-Access-Manager (BAM) Hardware manager. */
+
+#include <linux/types.h> /* u32 */
+#include <linux/kernel.h> /* pr_info() */
+#include <linux/io.h> /* ioread32() */
+#include <linux/bitops.h> /* find_first_bit() */
+#include <linux/errno.h> /* ENODEV */
+
+#include "bam.h"
+
+/**
+ * Valid BAM Hardware version.
+ *
+ */
+#define BAM_MIN_VERSION 2
+#define BAM_MAX_VERSION 2
+
+/**
+ * BAM Hardware registers.
+ *
+ */
+#define CTRL (0xf80)
+#define REVISION (0xf84)
+#define NUM_PIPES (0xfbc)
+#define DESC_CNT_TRSHLD (0xf88)
+#define IRQ_SRCS (0xf8c)
+#define IRQ_SRCS_MSK (0xf90)
+#define IRQ_SRCS_UNMASKED (0xfb0)
+#define IRQ_STTS (0xf94)
+#define IRQ_CLR (0xf98)
+#define IRQ_EN (0xf9c)
+#define IRQ_SIC_SEL (0xfa0)
+#define AHB_MASTER_ERR_CTRLS (0xfa4)
+#define AHB_MASTER_ERR_ADDR (0xfa8)
+#define AHB_MASTER_ERR_DATA (0xfac)
+#define IRQ_DEST (0xfb4)
+#define PERIPH_IRQ_DEST (0xfb8)
+#define TEST_BUS_REG (0xff8)
+#define CNFG_BITS (0xffc)
+
+#define P_CTRL(n) (0x0000 + 128 * (n))
+#define P_RST(n) (0x0004 + 128 * (n))
+#define P_HALT(n) (0x0008 + 128 * (n))
+#define P_IRQ_STTS(n) (0x0010 + 128 * (n))
+#define P_IRQ_CLR(n) (0x0014 + 128 * (n))
+#define P_IRQ_EN(n) (0x0018 + 128 * (n))
+#define P_TIMER(n) (0x001c + 128 * (n))
+#define P_TIMER_CTRL(n) (0x0020 + 128 * (n))
+#define P_EVNT_DEST_ADDR(n) (0x102c + 64 * (n))
+#define P_EVNT_REG(n) (0x1018 + 64 * (n))
+#define P_SW_OFSTS(n) (0x1000 + 64 * (n))
+#define P_DATA_FIFO_ADDR(n) (0x1024 + 64 * (n))
+#define P_DESC_FIFO_ADDR(n) (0x101c + 64 * (n))
+#define P_EVNT_GEN_TRSHLD(n) (0x1028 + 64 * (n))
+#define P_FIFO_SIZES(n) (0x1020 + 64 * (n))
+#define P_IRQ_DEST_ADDR(n) (0x103c + 64 * (n))
+#define P_RETR_CNTXT(n) (0x1034 + 64 * (n))
+#define P_SI_CNTXT(n) (0x1038 + 64 * (n))
+#define P_AU_PSM_CNTXT_1(n) (0x1004 + 64 * (n))
+#define P_PSM_CNTXT_2(n) (0x1008 + 64 * (n))
+#define P_PSM_CNTXT_3(n) (0x100c + 64 * (n))
+#define P_PSM_CNTXT_4(n) (0x1010 + 64 * (n))
+#define P_PSM_CNTXT_5(n) (0x1014 + 64 * (n))
+
+/**
+ * BAM Hardware registers bitmask.
+ * format: <register>_<field>
+ *
+ */
+/* CTRL */
+#define BAM_CACHED_DESC_STORE 0x8000
+#define BAM_DESC_CACHE_SEL 0x6000
+#define BAM_PERIPH_IRQ_SIC_SEL 0x1000
+#define BAM_TESTBUS_SEL 0xfe0
+#define BAM_EN_ACCUM 0x10
+#define BAM_EN 0x2
+#define BAM_SW_RST 0x1
+
+/* IRQ_SRCS */
+#define BAM_IRQ 0x80000000
+#define P_IRQ 0x7fffffff
+
+#define IRQ_STTS_BAM_ERROR_IRQ 0x4
+#define IRQ_STTS_BAM_HRESP_ERR_IRQ 0x2
+#define IRQ_CLR_BAM_ERROR_CLR 0x4
+#define IRQ_CLR_BAM_HRESP_ERR_CLR 0x2
+#define IRQ_EN_BAM_ERROR_EN 0x4
+#define IRQ_EN_BAM_HRESP_ERR_EN 0x2
+#define IRQ_SIC_SEL_BAM_IRQ_SIC_SEL 0x80000000
+#define IRQ_SIC_SEL_P_IRQ_SIC_SEL 0x7fffffff
+#define AHB_MASTER_ERR_CTRLS_BAM_ERR_DIRECT_MODE 0x10000
+#define AHB_MASTER_ERR_CTRLS_BAM_ERR_HCID 0xf000
+#define AHB_MASTER_ERR_CTRLS_BAM_ERR_HPROT 0xf00
+#define AHB_MASTER_ERR_CTRLS_BAM_ERR_HBURST 0xe0
+#define AHB_MASTER_ERR_CTRLS_BAM_ERR_HSIZE 0x18
+#define AHB_MASTER_ERR_CTRLS_BAM_ERR_HWRITE 0x4
+#define AHB_MASTER_ERR_CTRLS_BAM_ERR_HTRANS 0x3
+#define CNFG_BITS_BAM_FULL_PIPE 0x800
+#define CNFG_BITS_BAM_PIPE_CNFG 0x4
+
+/* P_ctrln */
+#define P_SYS_MODE 0x20
+#define P_SYS_STRM 0x10
+#define P_DIRECTION 0x8
+#define P_EN 0x2
+
+#define P_RST_P_SW_RST 0x1
+
+#define P_HALT_P_PROD_HALTED 0x2
+#define P_HALT_P_HALT 0x1
+
+#define P_IRQ_STTS_P_TRNSFR_END_IRQ 0x20
+#define P_IRQ_STTS_P_ERR_IRQ 0x10
+#define P_IRQ_STTS_P_OUT_OF_DESC_IRQ 0x8
+#define P_IRQ_STTS_P_WAKE_IRQ 0x4
+#define P_IRQ_STTS_P_TIMER_IRQ 0x2
+#define P_IRQ_STTS_P_PRCSD_DESC_IRQ 0x1
+
+#define P_IRQ_CLR_P_TRNSFR_END_CLR 0x20
+#define P_IRQ_CLR_P_ERR_CLR 0x10
+#define P_IRQ_CLR_P_OUT_OF_DESC_CLR 0x8
+#define P_IRQ_CLR_P_WAKE_CLR 0x4
+#define P_IRQ_CLR_P_TIMER_CLR 0x2
+#define P_IRQ_CLR_P_PRCSD_DESC_CLR 0x1
+
+#define P_IRQ_EN_P_TRNSFR_END_EN 0x20
+#define P_IRQ_EN_P_ERR_EN 0x10
+#define P_IRQ_EN_P_OUT_OF_DESC_EN 0x8
+#define P_IRQ_EN_P_WAKE_EN 0x4
+#define P_IRQ_EN_P_TIMER_EN 0x2
+#define P_IRQ_EN_P_PRCSD_DESC_EN 0x1
+
+#define P_TIMER_P_TIMER 0xffff
+
+/* P_TIMER_ctrln */
+#define P_TIMER_RST 0x80000000
+#define P_TIMER_RUN 0x40000000
+#define P_TIMER_MODE 0x20000000
+#define P_TIMER_TRSHLD 0xffff
+
+/* P_EVNT_regn */
+#define P_BYTES_CONSUMED 0xffff0000
+#define P_DESC_FIFO_PEER_OFST 0xffff
+
+/* P_SW_ofstsn */
+#define SW_OFST_IN_DESC 0xffff0000
+#define SW_DESC_OFST 0xffff
+
+#define P_EVNT_GEN_TRSHLD_P_TRSHLD 0xffff
+
+/* P_FIFO_sizesn */
+#define P_DATA_FIFO_SIZE 0xffff0000
+#define P_DESC_FIFO_SIZE 0xffff
+
+#define P_RETR_CNTXT_RETR_DESC_OFST 0xffff0000
+#define P_RETR_CNTXT_RETR_OFST_IN_DESC 0xffff
+#define P_SI_CNTXT_SI_DESC_OFST 0xffff
+#define P_AU_PSM_CNTXT_1_AU_PSM_ACCUMED 0xffff0000
+#define P_AU_PSM_CNTXT_1_AU_ACKED 0xffff
+#define P_PSM_CNTXT_2_PSM_DESC_VALID 0x80000000
+#define P_PSM_CNTXT_2_PSM_DESC_IRQ 0x40000000
+#define P_PSM_CNTXT_2_PSM_DESC_IRQ_DONE 0x20000000
+#define P_PSM_CNTXT_2_PSM_GENERAL_BITS 0x1e000000
+#define P_PSM_CNTXT_2_PSM_CONS_STATE 0x1c00000
+#define P_PSM_CNTXT_2_PSM_PROD_SYS_STATE 0x380000
+#define P_PSM_CNTXT_2_PSM_PROD_B2B_STATE 0x70000
+#define P_PSM_CNTXT_2_PSM_DESC_SIZE 0xffff
+#define P_PSM_CNTXT_4_PSM_DESC_OFST 0xffff0000
+#define P_PSM_CNTXT_4_PSM_SAVED_ACCUMED_SIZE 0xffff
+#define P_PSM_CNTXT_5_PSM_BLOCK_BYTE_CNT 0xffff0000
+#define P_PSM_CNTXT_5_PSM_OFST_IN_DESC 0xffff
+
+#define BAM_ERROR (-1)
+
+/**
+ *
+ * Read register with debug info.
+ *
+ * @base - bam base virtual address.
+ * @offset - register offset.
+ *
+ * @return u32
+ */
+static inline u32 bam_read_reg(void *base, u32 offset)
+{
+ u32 val = ioread32(base + offset);
+ pr_debug("bam: read reg 0x%x r_val 0x%x.\n", offset, val);
+ return val;
+}
+
+/**
+ * Read register masked field with debug info.
+ *
+ * @base - bam base virtual address.
+ * @offset - register offset.
+ * @mask - register bitmask.
+ *
+ * @return u32
+ */
+static inline u32 bam_read_reg_field(void *base, u32 offset, const u32 mask)
+{
+ u32 shift = find_first_bit((void *)&mask, 32);
+ u32 val = ioread32(base + offset);
+ val &= mask; /* clear other bits */
+ val >>= shift;
+ pr_debug("bam: read reg 0x%x mask 0x%x r_val 0x%x.\n",
+ offset, mask, val);
+ return val;
+}
+
+/**
+ *
+ * Write register with debug info.
+ *
+ * @base - bam base virtual address.
+ * @offset - register offset.
+ * @val - value to write.
+ *
+ */
+static inline void bam_write_reg(void *base, u32 offset, u32 val)
+{
+ iowrite32(val, base + offset);
+ pr_debug("bam: write reg 0x%x w_val 0x%x.\n", offset, val);
+}
+
+/**
+ * Write register masked field with debug info.
+ *
+ * @base - bam base virtual address.
+ * @offset - register offset.
+ * @mask - register bitmask.
+ * @val - value to write.
+ *
+ */
+static inline void bam_write_reg_field(void *base, u32 offset,
+ const u32 mask, u32 val)
+{
+ u32 shift = find_first_bit((void *)&mask, 32);
+ u32 tmp = ioread32(base + offset);
+
+ tmp &= ~mask; /* clear written bits */
+ val = tmp | (val << shift);
+ iowrite32(val, base + offset);
+ pr_debug("bam: write reg 0x%x w_val 0x%x.\n", offset, val);
+}
+
+/**
+ * Initialize a BAM device
+ *
+ */
+int bam_init(void *base, u32 ee,
+ u16 summing_threshold,
+ u32 irq_mask, u32 *version, u32 *num_pipes)
+{
+ /* disable bit#11 because of HW bug */
+ u32 cfg_bits = 0xffffffff & ~(1 << 11);
+ u32 ver = 0;
+
+ ver = bam_read_reg(base, REVISION);
+
+ if ((ver < BAM_MIN_VERSION) || (ver > BAM_MAX_VERSION)) {
+ pr_err("bam:Invalid BAM version 0x%x.\n", ver);
+ return -ENODEV;
+ }
+
+ if (summing_threshold == 0) {
+ summing_threshold = 4;
+ pr_err("bam:summing_threshold is zero , use default 4.\n");
+ }
+
+ bam_write_reg_field(base, CTRL, BAM_SW_RST, 1);
+ /* No delay needed */
+ bam_write_reg_field(base, CTRL, BAM_SW_RST, 0);
+
+ bam_write_reg_field(base, CTRL, BAM_EN, 1);
+
+ bam_write_reg(base, DESC_CNT_TRSHLD, summing_threshold);
+
+ bam_write_reg(base, CNFG_BITS, cfg_bits);
+
+ /*
+ * Enable Global BAM Interrupt - for error reasons ,
+ * filter with mask.
+ * Note: Pipes interrupts are disabled until BAM_P_IRQ_enn is set
+ */
+ bam_write_reg_field(base, IRQ_SRCS_MSK, BAM_IRQ, 1);
+
+ bam_write_reg(base, IRQ_EN, irq_mask);
+
+ *num_pipes = bam_read_reg(base, NUM_PIPES);
+ *version = ver;
+
+ return 0;
+}
+
+/**
+ * Verify that a BAM device is enabled and gathers the hardware
+ * configuration.
+ *
+ */
+int bam_check(void *base, u32 *version, u32 *num_pipes)
+{
+ u32 ver = 0;
+
+ if (!bam_read_reg_field(base, CTRL, BAM_EN))
+ return -ENODEV;
+
+ ver = bam_read_reg(base, REVISION);
+
+ /*
+ * Discover the hardware version number and the number of pipes
+ * supported by this BAM
+ */
+ *num_pipes = bam_read_reg(base, NUM_PIPES);
+ *version = ver;
+
+ /* Check BAM version */
+ if ((ver < BAM_MIN_VERSION) || (ver > BAM_MAX_VERSION)) {
+ pr_err("bam:Invalid BAM version 0x%x.\n", ver);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/**
+ * Disable a BAM device
+ *
+ */
+void bam_exit(void *base, u32 ee)
+{
+ bam_write_reg_field(base, IRQ_SRCS_MSK, BAM_IRQ, 0);
+
+ bam_write_reg(base, IRQ_EN, 0);
+
+ /* Disable the BAM */
+ bam_write_reg_field(base, CTRL, BAM_EN, 0);
+}
+
+/**
+ * Get and Clear BAM global IRQ status
+ *
+ * note: clear status only for pipes controlled by this
+ * processor
+ */
+u32 bam_get_and_clear_irq_status(void *base, u32 ee, u32 mask)
+{
+ u32 status = bam_read_reg(base, IRQ_SRCS);
+ u32 clr = status &= mask;
+
+ bam_write_reg(base, IRQ_CLR, clr);
+
+ return status;
+}
+
+/**
+ * Initialize a BAM pipe
+ */
+int bam_pipe_init(void *base, u32 pipe, struct bam_pipe_parameters *param)
+{
+ /* Reset the BAM pipe */
+ bam_write_reg(base, P_RST(pipe), 1);
+ /* No delay needed */
+ bam_write_reg(base, P_RST(pipe), 0);
+
+ /* Enable the Pipe Interrupt at the BAM level */
+ bam_write_reg_field(base, IRQ_SRCS_MSK, (1 << pipe), 1);
+
+ bam_write_reg(base, P_IRQ_EN(pipe), param->pipe_irq_mask);
+
+ bam_write_reg_field(base, P_CTRL(pipe), P_DIRECTION, param->dir);
+ bam_write_reg_field(base, P_CTRL(pipe), P_SYS_MODE, param->mode);
+
+ bam_write_reg(base, P_EVNT_GEN_TRSHLD(pipe), param->event_threshold);
+
+ bam_write_reg(base, P_DESC_FIFO_ADDR(pipe), param->desc_base);
+ bam_write_reg_field(base, P_FIFO_SIZES(pipe), P_DESC_FIFO_SIZE,
+ param->desc_size);
+
+ bam_write_reg_field(base, P_CTRL(pipe), P_SYS_STRM,
+ param->stream_mode);
+
+ if (param->mode == BAM_PIPE_MODE_BAM2BAM) {
+ u32 peer_dest_addr = param->peer_phys_addr +
+ P_EVNT_REG(param->peer_pipe);
+
+ bam_write_reg(base, P_DATA_FIFO_ADDR(pipe),
+ param->data_base);
+ bam_write_reg_field(base, P_FIFO_SIZES(pipe),
+ P_DATA_FIFO_SIZE, param->data_size);
+
+ bam_write_reg(base, P_EVNT_DEST_ADDR(pipe), peer_dest_addr);
+
+ pr_debug("bam:Bam=0x%x.Pipe=%d.peer_bam=0x%x.peer_pipe=%d.\n",
+ (u32) base, pipe,
+ (u32) param->peer_phys_addr,
+ param->peer_pipe);
+ }
+
+ /* Pipe Enable - at last */
+ bam_write_reg_field(base, P_CTRL(pipe), P_EN, 1);
+
+ return 0;
+}
+
+/**
+ * Reset the BAM pipe
+ *
+ */
+void bam_pipe_exit(void *base, u32 pipe, u32 ee)
+{
+ bam_write_reg(base, P_IRQ_EN(pipe), 0);
+
+ /* Disable the Pipe Interrupt at the BAM level */
+ bam_write_reg_field(base, IRQ_SRCS_MSK, (1 << pipe), 0);
+
+ /* Pipe Disable */
+ bam_write_reg_field(base, P_CTRL(pipe), P_EN, 0);
+}
+
+/**
+ * Enable a BAM pipe
+ *
+ */
+void bam_pipe_enable(void *base, u32 pipe)
+{
+ bam_write_reg_field(base, P_CTRL(pipe), P_EN, 1);
+}
+
+/**
+ * Diasble a BAM pipe
+ *
+ */
+void bam_pipe_disable(void *base, u32 pipe)
+{
+ bam_write_reg_field(base, P_CTRL(pipe), P_EN, 0);
+}
+
+/**
+ * Check if a BAM pipe is enabled.
+ *
+ */
+int bam_pipe_is_enabled(void *base, u32 pipe)
+{
+ return bam_read_reg_field(base, P_CTRL(pipe), P_EN);
+}
+
+/**
+ * Configure interrupt for a BAM pipe
+ *
+ */
+void bam_pipe_set_irq(void *base, u32 pipe, enum bam_enable irq_en,
+ u32 src_mask, u32 ee)
+{
+ bam_write_reg(base, P_IRQ_EN(pipe), src_mask);
+ bam_write_reg_field(base, IRQ_SRCS_MSK, (1 << pipe), irq_en);
+}
+
+/**
+ * Configure a BAM pipe for satellite MTI use
+ *
+ */
+void bam_pipe_satellite_mti(void *base, u32 pipe, u32 irq_gen_addr, u32 ee)
+{
+ bam_write_reg(base, P_IRQ_EN(pipe), 0);
+ bam_write_reg(base, P_IRQ_DEST_ADDR(pipe), irq_gen_addr);
+
+ bam_write_reg_field(base, IRQ_SIC_SEL, (1 << pipe), 1);
+ bam_write_reg_field(base, IRQ_SRCS_MSK, (1 << pipe), 1);
+}
+
+/**
+ * Configure MTI for a BAM pipe
+ *
+ */
+void bam_pipe_set_mti(void *base, u32 pipe, enum bam_enable irq_en,
+ u32 src_mask, u32 irq_gen_addr)
+{
+ /*
+ * MTI use is only supported on BAMs when global config is controlled
+ * by a remote processor.
+ * Consequently, the global configuration register to enable SIC (MTI)
+ * support cannot be accessed.
+ * The remote processor must be relied upon to enable the SIC and the
+ * interrupt. Since the remote processor enable both SIC and interrupt,
+ * the interrupt enable mask must be set to zero for polling mode.
+ */
+
+ bam_write_reg(base, P_IRQ_DEST_ADDR(pipe), irq_gen_addr);
+
+ if (!irq_en)
+ src_mask = 0;
+
+ bam_write_reg(base, P_IRQ_EN(pipe), src_mask);
+}
+
+/**
+ * Get and Clear BAM pipe IRQ status
+ *
+ */
+u32 bam_pipe_get_and_clear_irq_status(void *base, u32 pipe)
+{
+ u32 status = 0;
+
+ status = bam_read_reg(base, P_IRQ_STTS(pipe));
+ bam_write_reg(base, P_IRQ_CLR(pipe), status);
+
+ return status;
+}
+
+/**
+ * Set write offset for a BAM pipe
+ *
+ */
+void bam_pipe_set_desc_write_offset(void *base, u32 pipe, u32 next_write)
+{
+ /*
+ * It is not necessary to perform a read-modify-write masking to write
+ * the P_DESC_FIFO_PEER_OFST value, since the other field in the
+ * register (P_BYTES_CONSUMED) is read-only.
+ */
+ bam_write_reg_field(base, P_EVNT_REG(pipe), P_DESC_FIFO_PEER_OFST,
+ next_write);
+}
+
+/**
+ * Get write offset for a BAM pipe
+ *
+ */
+u32 bam_pipe_get_desc_write_offset(void *base, u32 pipe)
+{
+ return bam_read_reg_field(base, P_EVNT_REG(pipe),
+ P_DESC_FIFO_PEER_OFST);
+}
+
+/**
+ * Get read offset for a BAM pipe
+ *
+ */
+u32 bam_pipe_get_desc_read_offset(void *base, u32 pipe)
+{
+ return bam_read_reg_field(base, P_SW_OFSTS(pipe), SW_DESC_OFST);
+}
+
+/**
+ * Configure inactivity timer count for a BAM pipe
+ *
+ */
+void bam_pipe_timer_config(void *base, u32 pipe, enum bam_pipe_timer_mode mode,
+ u32 timeout_count)
+{
+ bam_write_reg_field(base, P_TIMER_CTRL(pipe), P_TIMER_MODE, mode);
+ bam_write_reg_field(base, P_TIMER_CTRL(pipe), P_TIMER_TRSHLD,
+ timeout_count);
+}
+
+/**
+ * Reset inactivity timer for a BAM pipe
+ *
+ */
+void bam_pipe_timer_reset(void *base, u32 pipe)
+{
+ /* reset */
+ bam_write_reg_field(base, P_TIMER_CTRL(pipe), P_TIMER_RST, 0);
+ /* active */
+ bam_write_reg_field(base, P_TIMER_CTRL(pipe), P_TIMER_RST, 1);
+}
+
+/**
+ * Get inactivity timer count for a BAM pipe
+ *
+ */
+u32 bam_pipe_timer_get_count(void *base, u32 pipe)
+{
+ return bam_read_reg(base, P_TIMER(pipe));
+}
diff --git a/arch/arm/mach-msm/sps/bam.h b/arch/arm/mach-msm/sps/bam.h
new file mode 100644
index 0000000..5681f96
--- /dev/null
+++ b/arch/arm/mach-msm/sps/bam.h
@@ -0,0 +1,375 @@
+/* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/* Bus-Access-Manager (BAM) Hardware manager functions API. */
+
+#ifndef _BAM_H_
+#define _BAM_H_
+
+#include <linux/types.h> /* u32 */
+#include <linux/io.h> /* ioread32() */
+#include <linux/bitops.h> /* find_first_bit() */
+
+/* Pipe mode */
+enum bam_pipe_mode {
+ BAM_PIPE_MODE_BAM2BAM = 0, /* BAM to BAM */
+ BAM_PIPE_MODE_SYSTEM = 1, /* BAM to/from System Memory */
+};
+
+/* Pipe direction */
+enum bam_pipe_dir {
+ /* The Pipe Reads data from data-fifo or system-memory */
+ BAM_PIPE_CONSUMER = 0,
+ /* The Pipe Writes data to data-fifo or system-memory */
+ BAM_PIPE_PRODUCER = 1,
+};
+
+/* Stream mode Type */
+enum bam_stream_mode {
+ BAM_STREAM_MODE_DISABLE = 0,
+ BAM_STREAM_MODE_ENABLE = 1,
+};
+
+/* Enable Type */
+enum bam_enable {
+ BAM_DISABLE = 0,
+ BAM_ENABLE = 1,
+};
+
+/* Pipe timer mode */
+enum bam_pipe_timer_mode {
+ BAM_PIPE_TIMER_ONESHOT = 0,
+ BAM_PIPE_TIMER_PERIODIC = 1,
+};
+
+struct transfer_descriptor {
+ u32 addr; /* Buffer physical address */
+ u32 size:16; /* Buffer size in bytes */
+ u32 flags:16; /* Flag bitmask (see SPS_IOVEC_FLAG_ #defines) */
+} __packed;
+
+/* BAM pipe initialization parameters */
+struct bam_pipe_parameters {
+ u16 event_threshold;
+ u32 pipe_irq_mask;
+ enum bam_pipe_dir dir;
+ enum bam_pipe_mode mode;
+ u32 desc_base; /* Physical address of descriptor FIFO */
+ u32 desc_size; /* Size (bytes) of descriptor FIFO */
+ enum bam_stream_mode stream_mode;
+ u32 ee; /* BAM execution environment index */
+
+ /* The following are only valid if mode is BAM2BAM */
+ u32 peer_phys_addr;
+ u32 peer_pipe;
+ u32 data_base; /* Physical address of data FIFO */
+ u32 data_size; /* Size (bytes) of data FIFO */
+};
+
+/**
+ * Initialize a BAM device
+ *
+ * This function initializes a BAM device.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @ee - BAM execution environment index
+ *
+ * @summing_threshold - summing threshold (global for all pipes)
+ *
+ * @irq_mask - error interrupts mask
+ *
+ * @version - return BAM hardware version
+ *
+ * @num_pipes - return number of pipes
+ *
+ * @return 0 on success, negative value on error
+ *
+ */
+int bam_init(void *base,
+ u32 ee,
+ u16 summing_threshold,
+ u32 irq_mask, u32 *version, u32 *num_pipes);
+
+/**
+ * Check a BAM device
+ *
+ * This function verifies that a BAM device is enabled and gathers
+ * the hardware configuration.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @version - return BAM hardware version
+ *
+ * @num_pipes - return number of pipes
+ *
+ * @return 0 on success, negative value on error
+ *
+ */
+int bam_check(void *base, u32 *version, u32 *num_pipes);
+
+/**
+ * Disable a BAM device
+ *
+ * This function disables a BAM device.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @ee - BAM execution environment index
+ *
+ */
+void bam_exit(void *base, u32 ee);
+
+/**
+ * Get and Clear BAM global IRQ status
+ *
+ * This function gets and clears BAM global IRQ status.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @ee - BAM execution environment index
+ *
+ * @mask - active pipes mask.
+ *
+ * @return IRQ status
+ *
+ */
+u32 bam_get_and_clear_irq_status(void *base, u32 ee, u32 mask);
+
+/**
+ * Initialize a BAM pipe
+ *
+ * This function initializes a BAM pipe.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @param - bam pipe parameters.
+ *
+ * @return 0 on success, negative value on error
+ *
+ */
+int bam_pipe_init(void *base, u32 pipe, struct bam_pipe_parameters *param);
+
+/**
+ * Reset the BAM pipe
+ *
+ * This function resets the BAM pipe.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @ee - BAM execution environment index
+ *
+ */
+void bam_pipe_exit(void *base, u32 pipe, u32 ee);
+
+/**
+ * Enable a BAM pipe
+ *
+ * This function enables a BAM pipe.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ */
+void bam_pipe_enable(void *base, u32 pipe);
+
+/**
+ * Disable a BAM pipe
+ *
+ * This function disables a BAM pipe.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ */
+void bam_pipe_disable(void *base, u32 pipe);
+
+/**
+ * Get a BAM pipe enable state
+ *
+ * This function determines if a BAM pipe is enabled.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @return true if enabled, false if disabled
+ *
+ */
+int bam_pipe_is_enabled(void *base, u32 pipe);
+
+/**
+ * Configure interrupt for a BAM pipe
+ *
+ * This function configures the interrupt for a BAM pipe.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @irq_en - enable or disable interrupt
+ *
+ * @src_mask - interrupt source mask, set regardless of whether
+ * interrupt is disabled
+ *
+ * @ee - BAM execution environment index
+ *
+ */
+void bam_pipe_set_irq(void *base, u32 pipe, enum bam_enable irq_en,
+ u32 src_mask, u32 ee);
+
+/**
+ * Configure a BAM pipe for satellite MTI use
+ *
+ * This function configures a BAM pipe for satellite MTI use.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @irq_gen_addr - physical address written to generate MTI
+ *
+ * @ee - BAM execution environment index
+ *
+ */
+void bam_pipe_satellite_mti(void *base, u32 pipe, u32 irq_gen_addr, u32 ee);
+
+/**
+ * Configure MTI for a BAM pipe
+ *
+ * This function configures the interrupt for a BAM pipe.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @irq_en - enable or disable interrupt
+ *
+ * @src_mask - interrupt source mask, set regardless of whether
+ * interrupt is disabled
+ *
+ * @irq_gen_addr - physical address written to generate MTI
+ *
+ */
+void bam_pipe_set_mti(void *base, u32 pipe, enum bam_enable irq_en,
+ u32 src_mask, u32 irq_gen_addr);
+
+/**
+ * Get and Clear BAM pipe IRQ status
+ *
+ * This function gets and clears BAM pipe IRQ status.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @return IRQ status
+ *
+ */
+u32 bam_pipe_get_and_clear_irq_status(void *base, u32 pipe);
+
+/**
+ * Set write offset for a BAM pipe
+ *
+ * This function sets the write offset for a BAM pipe. This is
+ * the offset that is maintained by software in system mode.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @next_write - descriptor FIFO write offset
+ *
+ */
+void bam_pipe_set_desc_write_offset(void *base, u32 pipe, u32 next_write);
+
+/**
+ * Get write offset for a BAM pipe
+ *
+ * This function gets the write offset for a BAM pipe. This is
+ * the offset that is maintained by the pipe's peer pipe or by software.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @return descriptor FIFO write offset
+ *
+ */
+u32 bam_pipe_get_desc_write_offset(void *base, u32 pipe);
+
+/**
+ * Get read offset for a BAM pipe
+ *
+ * This function gets the read offset for a BAM pipe. This is
+ * the offset that is maintained by the pipe in system mode.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @return descriptor FIFO read offset
+ *
+ */
+u32 bam_pipe_get_desc_read_offset(void *base, u32 pipe);
+
+/**
+ * Configure inactivity timer count for a BAM pipe
+ *
+ * This function configures the inactivity timer count for a BAM pipe.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @mode - timer operating mode
+ *
+ * @timeout_count - timeout count
+ *
+ */
+void bam_pipe_timer_config(void *base, u32 pipe,
+ enum bam_pipe_timer_mode mode,
+ u32 timeout_count);
+
+/**
+ * Reset inactivity timer for a BAM pipe
+ *
+ * This function resets the inactivity timer count for a BAM pipe.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ */
+void bam_pipe_timer_reset(void *base, u32 pipe);
+
+/**
+ * Get inactivity timer count for a BAM pipe
+ *
+ * This function gets the inactivity timer count for a BAM pipe.
+ *
+ * @base - BAM virtual base address.
+ *
+ * @pipe - pipe index
+ *
+ * @return inactivity timer count
+ *
+ */
+u32 bam_pipe_timer_get_count(void *base, u32 pipe);
+
+#endif /* _BAM_H_ */
--
1.7.3.3
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


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