The patch adds support for the programmable realtime unit (PRU)
available on OMAPL138. This defines the system resource
requirements such as pin mux, clock, iomem, interrupt etc
and registers the platform device as per the Linux driver model.
Signed-off-by: Subhasish Ghosh <subhas...@mistralsolutions.com>
---
arch/arm/mach-davinci/board-da850-evm.c | 27 ++++++++++++++++++
arch/arm/mach-davinci/da850.c | 34 +++++++++++++++++++----
arch/arm/mach-davinci/devices-da8xx.c | 37 +++++++++++++++++++++++++
arch/arm/mach-davinci/include/mach/da8xx.h | 2 +
arch/arm/mach-davinci/include/mach/mux.h | 5 +++
include/linux/can/platform/ti_omapl_pru_can.h | 29 +++++++++++++++++++
6 files changed, 128 insertions(+), 6 deletions(-)
create mode 100644 include/linux/can/platform/ti_omapl_pru_can.h
diff --git a/arch/arm/mach-davinci/board-da850-evm.c
b/arch/arm/mach-davinci/board-da850-evm.c
index f89b0b7..e907ef5 100644
--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -43,6 +43,7 @@
#define DA850_MMCSD_CD_PIN GPIO_TO_PIN(4, 0)
#define DA850_MMCSD_WP_PIN GPIO_TO_PIN(4, 1)
+#define DA850_PRU_CAN_TRX_PIN GPIO_TO_PIN(2, 0)
#define DA850_MII_MDIO_CLKEN_PIN GPIO_TO_PIN(2, 6)
@@ -188,6 +189,32 @@ static struct platform_device *da850_evm_devices[]
__initdata = {
&da850_evm_norflash_device,
};
+static int __init da850_evm_setup_pru_can(void)
+{
+ int ret;
+
+ if (!machine_is_davinci_da850_evm())
+ return 0;
+
+ ret = davinci_cfg_reg_list(da850_pru_can_pins);
+ if (ret)
+ pr_warning("da850_evm_init: da850_pru_can_pins mux setup"
+ "failed:%d\n", ret);
+
+ ret = gpio_request(DA850_PRU_CAN_TRX_PIN, "pru_can_en");
+ if (ret)
+ pr_warning("Cannot open GPIO %d\n", DA850_PRU_CAN_TRX_PIN);
+
+ /* value = 0 to enable the can transceiver */
+ gpio_direction_output(DA850_PRU_CAN_TRX_PIN, 0);
+ ret = da8xx_register_pru_can();
+ if (ret)
+ pr_warning("da850_evm_init: pru can registration failed:"
+ "%d\n", ret);
+ return ret;
+}
+device_initcall(da850_evm_setup_pru_can);
+
#define DA8XX_AEMIF_CE2CFG_OFFSET 0x10
#define DA8XX_AEMIF_ASIZE_16BIT 0x1
diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index 63916b9..59a3638 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c
@@ -238,6 +238,13 @@ static struct clk tptc2_clk = {
.flags = ALWAYS_ENABLED,
};
+static struct clk pru_clk = {
+ .name = "pru_ck",
+ .parent = &pll0_sysclk2,
+ .lpsc = DA8XX_LPSC0_DMAX,
+ .flags = ALWAYS_ENABLED,
+};
+
static struct clk uart0_clk = {
.name = "uart0",
.parent = &pll0_sysclk2,
@@ -373,6 +380,7 @@ static struct clk_lookup da850_clks[] = {
CLK(NULL, "tpcc1", &tpcc1_clk),
CLK(NULL, "tptc2", &tptc2_clk),
CLK(NULL, "uart0", &uart0_clk),
+ CLK(NULL, "pru_ck", &pru_clk),
CLK(NULL, "uart1", &uart1_clk),
CLK(NULL, "uart2", &uart2_clk),
CLK(NULL, "aintc", &aintc_clk),
@@ -390,12 +398,15 @@ static struct clk_lookup da850_clks[] = {
CLK(NULL, NULL, NULL),
};
-/*
- * Device specific mux setup
- *
- * soc description mux mode mode mux dbg
- * reg offset mask mode
+/* soc -> DA850
+ * desc -> Pin name, which evaluates to soc##_##desc.
+ * muxreg -> Pin Multiplexing Control n (PINMUXn) Register number.
+ * mode_offset -> Bit offset in the register PINMUXn.
+ * mode_mask -> Number of bits for Pin Multiplexing Control n.
+ * mux_mode -> Multiplexing mode to set.
+ * dbg -> debug on/off.
*/
+
static const struct mux_config da850_pins[] = {
#ifdef CONFIG_DAVINCI_MUX
/* UART0 function */
@@ -514,7 +525,7 @@ static const struct mux_config da850_pins[] = {
MUX_CFG(DA850, EMA_A_5, 12, 8, 15, 1, false)
MUX_CFG(DA850, EMA_A_6, 12, 4, 15, 1, false)
MUX_CFG(DA850, EMA_A_7, 12, 0, 15, 1, false)
- MUX_CFG(DA850, EMA_A_8, 11, 28, 15, 1, false)
+ MUX_CFG(DA850, EMA_A_8, 11, 28, 15, 1, false)
MUX_CFG(DA850, EMA_A_9, 11, 24, 15, 1, false)
MUX_CFG(DA850, EMA_A_10, 11, 20, 15, 1, false)
MUX_CFG(DA850, EMA_A_11, 11, 16, 15, 1, false)
@@ -542,7 +553,12 @@ static const struct mux_config da850_pins[] = {
MUX_CFG(DA850, EMA_CLK, 6, 0, 15, 1, false)
MUX_CFG(DA850, EMA_WAIT_1, 6, 24, 15, 1, false)
MUX_CFG(DA850, NEMA_CS_2, 7, 0, 15, 1, false)
+ /* PRU functions for soft can */
+ MUX_CFG(DA850, PRU0_R31_0, 7, 28, 15, 0, false)
+ MUX_CFG(DA850, PRU1_R30_15, 12, 0, 15, 4, false)
+ MUX_CFG(DA850, PRU1_R31_18, 11, 20, 15, 0, false)
/* GPIO function */
+ MUX_CFG(DA850, GPIO2_0, 6, 28, 15, 8, false)
MUX_CFG(DA850, GPIO2_6, 6, 4, 15, 8, false)
MUX_CFG(DA850, GPIO2_8, 5, 28, 15, 8, false)
MUX_CFG(DA850, GPIO2_15, 5, 0, 15, 8, false)
@@ -557,6 +573,12 @@ const short da850_uart0_pins[] __initdata = {
-1
};
+const short da850_pru_can_pins[] __initdata = {
+ DA850_GPIO2_0, DA850_PRU0_R31_0, DA850_PRU1_R30_15,
+ DA850_PRU1_R31_18,
+ -1
+};
+
const short da850_uart1_pins[] __initdata = {
DA850_UART1_RXD, DA850_UART1_TXD,
-1
diff --git a/arch/arm/mach-davinci/devices-da8xx.c
b/arch/arm/mach-davinci/devices-da8xx.c
index 9eec630..11a9b67 100644
--- a/arch/arm/mach-davinci/devices-da8xx.c
+++ b/arch/arm/mach-davinci/devices-da8xx.c
@@ -14,6 +14,7 @@
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/serial_8250.h>
+#include <linux/can/platform/ti_omapl_pru_can.h>
#include <mach/cputype.h>
#include <mach/common.h>
@@ -85,6 +86,42 @@ struct platform_device da8xx_serial_device = {
},
};
+/* Info specific to OMAPL138 */
+#define OMAPL138_PRU_MEM_BASE 0x01C30000
+#define OMAPL138_INT_PRU_CAN IRQ_DA8XX_EVTOUT0
+static struct resource omapl138_pru_can_resources[] = {
+ {
+ .start = OMAPL138_PRU_MEM_BASE,
+ .end = OMAPL138_PRU_MEM_BASE + 0xFFFF,
+ .flags = IORESOURCE_MEM,
+ },
+ {
+ .start = OMAPL138_INT_PRU_CAN,
+ .end = OMAPL138_INT_PRU_CAN,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct platform_device omapl138_pru_can_device = {
+ .name = "davinci_pru_can",
+ .id = 1,
+ .num_resources = ARRAY_SIZE(omapl138_pru_can_resources),
+ .resource = omapl138_pru_can_resources,
+};
+
+/* Info specific to CAN conroller */
+#define OMAPL138_PRU_CAN_VERSION 1
+
+static struct ti_pru_can_platform_data ti_pru_can_pdata = {
+ .version = OMAPL138_PRU_CAN_VERSION,
+};
+
+int __init da8xx_register_pru_can(void)
+{
+ omapl138_pru_can_device.dev.platform_data = &ti_pru_can_pdata;
+ return platform_device_register(&omapl138_pru_can_device);
+}
+
static const s8 da8xx_queue_tc_mapping[][2] = {
/* {event queue no, TC no} */
{0, 0},
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h
b/arch/arm/mach-davinci/include/mach/da8xx.h
index 4247b3f..3e88676 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -74,6 +74,7 @@ int da8xx_register_watchdog(void);
int da8xx_register_usb20(unsigned mA, unsigned potpgt);
int da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata);
int da8xx_register_emac(void);
+int da8xx_register_pru_can(void);
int da8xx_register_lcdc(struct da8xx_lcdc_platform_data *pdata);
int da8xx_register_mmcsd0(struct davinci_mmc_config *config);
int da850_register_mmcsd1(struct davinci_mmc_config *config);
@@ -122,6 +123,7 @@ extern const short da850_uart2_pins[];
extern const short da850_i2c0_pins[];
extern const short da850_i2c1_pins[];
extern const short da850_cpgmac_pins[];
+extern const short da850_pru_can_pins[];
extern const short da850_mcasp_pins[];
extern const short da850_lcdcntl_pins[];
extern const short da850_mmcsd0_pins[];
diff --git a/arch/arm/mach-davinci/include/mach/mux.h
b/arch/arm/mach-davinci/include/mach/mux.h
index de11aac..1f1fb64 100644
--- a/arch/arm/mach-davinci/include/mach/mux.h
+++ b/arch/arm/mach-davinci/include/mach/mux.h
@@ -906,8 +906,13 @@ enum davinci_da850_index {
DA850_EMA_CLK,
DA850_EMA_WAIT_1,
DA850_NEMA_CS_2,
+ /* PRU I/O */
+ DA850_PRU0_R31_0,
+ DA850_PRU1_R30_15,
+ DA850_PRU1_R31_18,
/* GPIO function */
+ DA850_GPIO2_0,
DA850_GPIO2_6,
DA850_GPIO2_8,
DA850_GPIO2_15,
diff --git a/include/linux/can/platform/ti_omapl_pru_can.h
b/include/linux/can/platform/ti_omapl_pru_can.h
new file mode 100644
index 0000000..0dea436
--- /dev/null
+++ b/include/linux/can/platform/ti_omapl_pru_can.h
@@ -0,0 +1,29 @@
+/*
+ * TI OMAPL PRU CAN Emulation device driver
+ *
+ * This driver supports TI's PRU CAN Emulation and the
+ *
+ * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed as is WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+
+/**
+ * struct ti_pru_can_platform_data - PRU CAN platform data
+ *
+ * @version: version for future use
+ *
+ * Platform data structure to get all platform specific settings.
+ */
+
+struct ti_pru_can_platform_data {
+ u32 version;
+};
--
1.7.2.3
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