TI's sequencer serial port (TI-SSP) is a jack-of-all-trades type of serial port
device. It has a built-in programmable execution engine that can be programmed
to operate as almost any serial bus (I2C, SPI, EasyScale, and others).
This patch adds a driver for this controller device. The driver does not
expose a user-land interface. Protocol drivers built on top of this layer are
expected to remain in-kernel.
Signed-off-by: Cyril Chemparathy <cy...@ti.com>
---
arch/arm/mach-davinci/include/mach/ti_ssp.h | 92 ++++++
drivers/misc/Kconfig | 11 +
drivers/misc/Makefile | 1 +
drivers/misc/ti_ssp.c | 443 +++++++++++++++++++++++++++
4 files changed, 547 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-davinci/include/mach/ti_ssp.h
create mode 100644 drivers/misc/ti_ssp.c
diff --git a/arch/arm/mach-davinci/include/mach/ti_ssp.h
b/arch/arm/mach-davinci/include/mach/ti_ssp.h
new file mode 100644
index 0000000..8365101
--- /dev/null
+++ b/arch/arm/mach-davinci/include/mach/ti_ssp.h
@@ -0,0 +1,92 @@
+/*
+ * Sequencer Serial Port (SSP) driver for Texas Instruments' SoCs
+ *
+ * Copyright (C) 2010 Texas Instruments Inc
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __TI_SSP_H__
+#define __TI_SSP_H__
+
+struct ti_ssp_data {
+ unsigned long out_clock;
+};
+
+struct ti_ssp_port_data {
+ const char *ssp_dev_name;
+ int port;
+ unsigned long iosel; /* see note below */
+ unsigned long config;
+};
+
+struct ti_ssp_port;
+
+/*
+ * Sequencer port IO pin configuration bits. These do not correlate 1-1 with
+ * the hardware. The iosel field in the port data combines iosel1 and iosel2,
+ * and is therefore not a direct map to register space. It is best to use the
+ * macros below to construct iosel values.
+ *
+ * least significant 16 bits --> iosel1
+ * most significant 16 bits --> iosel2
+ */
+
+#define SSP_IN 0x0000
+#define SSP_DATA 0x0001
+#define SSP_CLOCK 0x0002
+#define SSP_CHIPSEL 0x0003
+#define SSP_OUT 0x0004
+#define SSP_PIN_SEL(pin, v) ((v) << ((pin) * 3))
+#define SSP_PIN_MASK(pin) SSP_PIN_SEL(pin, 0x7)
+#define SSP_INPUT_SEL(pin) ((pin) << 16)
+
+/* Sequencer port config bits */
+#define SSP_EARLY_DIN BIT(8)
+#define SSP_DELAY_DOUT BIT(9)
+
+/* Sequence map definitions */
+#define SSP_CLK_HIGH BIT(0)
+#define SSP_CLK_LOW 0
+#define SSP_DATA_HIGH BIT(1)
+#define SSP_DATA_LOW 0
+#define SSP_CS_HIGH BIT(2)
+#define SSP_CS_LOW 0
+#define SSP_OUT_MODE BIT(3)
+#define SSP_IN_MODE 0
+#define SSP_DATA_REG BIT(4)
+#define SSP_ADDR_REG 0
+
+#define SSP_OPCODE_DIRECT ((0x0) << 5)
+#define SSP_OPCODE_TOGGLE ((0x1) << 5)
+#define SSP_OPCODE_SHIFT ((0x2) << 5)
+#define SSP_OPCODE_BRANCH0 ((0x4) << 5)
+#define SSP_OPCODE_BRANCH1 ((0x5) << 5)
+#define SSP_OPCODE_BRANCH ((0x6) << 5)
+#define SSP_OPCODE_STOP ((0x7) << 5)
+#define SSP_BRANCH(addr) ((addr) << 8)
+#define SSP_COUNT(cycles) ((cycles) << 8)
+
+struct ti_ssp_port *ti_ssp_open(const struct ti_ssp_port_data *data);
+int ti_ssp_close(struct ti_ssp_port *dev);
+int ti_ssp_dumpregs(struct ti_ssp_port *dev);
+int ti_ssp_raw_read(struct ti_ssp_port *dev);
+int ti_ssp_raw_write(struct ti_ssp_port *dev, u32 val);
+int ti_ssp_load(struct ti_ssp_port *dev, int offs, u32* prog, int len);
+int ti_ssp_run(struct ti_ssp_port *dev, u32 pc, u32 input, u32 *output);
+int ti_ssp_set_mode(struct ti_ssp_port *dev, int mode);
+int ti_ssp_set_iosel(struct ti_ssp_port *dev, u32 iosel);
+
+#endif /* __TI_SSP_H__ */
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index b743312..9fb8470 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -390,6 +390,17 @@ config BMP085
To compile this driver as a module, choose M here: the
module will be called bmp085.
+config TI_SSP
+ depends on ARCH_DAVINCI_TNETV107X
+ tristate "Sequencer Serial Port support"
+ default y
+ ---help---
+ Say Y here if you want support for the Sequencer Serial Port
+ in a Texas Instruments TNETV107X SoC.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ti_ssp.
+
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 42eab95..7568100 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o
obj-$(CONFIG_EP93XX_PWM) += ep93xx_pwm.o
obj-$(CONFIG_DS1682) += ds1682.o
obj-$(CONFIG_TI_DAC7512) += ti_dac7512.o
+obj-$(CONFIG_TI_SSP) += ti_ssp.o
obj-$(CONFIG_C2PORT) += c2port/
obj-$(CONFIG_IWMC3200TOP) += iwmc3200top/
obj-$(CONFIG_HMC6352) += hmc6352.o
diff --git a/drivers/misc/ti_ssp.c b/drivers/misc/ti_ssp.c
new file mode 100644
index 0000000..edbc94d
--- /dev/null
+++ b/drivers/misc/ti_ssp.c
@@ -0,0 +1,443 @@
+/*
+ * Sequencer Serial Port (SSP) driver for Texas Instruments' SoCs
+ *
+ * Copyright (C) 2010 Texas Instruments Inc
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/wait.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include <mach/ti_ssp.h>
+
+/* Register Offsets */
+#define SSP_REG_REV 0x00
+#define SSP_REG_IOSEL_1 0x04
+#define SSP_REG_IOSEL_2 0x08
+#define SSP_REG_PREDIV 0x0c
+#define SSP_REG_INTR_STAT 0x10
+#define SSP_REG_INTR_EN 0x14
+#define SSP_REG_TEST_CTRL 0x18
+
+/* Per port registers */
+#define SSP_PORT_REG_CFG_2 0x00
+#define SSP_PORT_REG_ADDR 0x04
+#define SSP_PORT_REG_DATA 0x08
+#define SSP_PORT_REG_CFG_1 0x0c
+#define SSP_PORT_REG_STATE 0x10
+
+#define SSP_PORT_CONFIG_MASK (SSP_EARLY_DIN | SSP_DELAY_DOUT)
+#define SSP_PORT_CLKRATE_MASK 0x0f
+
+#define SSP_SEQRAM_WR_EN BIT(4)
+#define SSP_SEQRAM_RD_EN BIT(5)
+#define SSP_START BIT(15)
+#define SSP_BUSY BIT(10)
+#define SSP_PORT_ASL BIT(7)
+#define SSP_PORT_CFO1 BIT(6)
+
+#define SSP_PORT_SEQRAM_SIZE 32
+
+static const int ssp_port_base[] = {0x040, 0x080};
+static const int ssp_port_seqram[] = {0x100, 0x180};
+
+/* Register Access Macros */
+#define ssp_read(ssp, reg) __raw_readl((ssp)->regs + SSP_REG_##reg)
+#define ssp_write(ssp, reg, val) __raw_writel(val, (ssp)->regs + SSP_REG_##reg)
+
+#define ssp_rmw(ssp, reg, mask, bits) \
+ ssp_write(ssp, reg, (ssp_read(ssp, reg) & ~(mask)) | (bits))
+
+#define ssp_port_read(ssp, port, reg) \
+ __raw_readl((ssp)->regs + ssp_port_base[port] + \
+ SSP_PORT_REG_##reg)
+
+#define ssp_port_write(ssp, port, reg, val) \
+ __raw_writel(val, (ssp)->regs + ssp_port_base[port] + \
+ SSP_PORT_REG_##reg)
+
+#define ssp_port_rmw(ssp, port, reg, mask, bits) \
+ ssp_port_write(ssp, port, reg, \
+ (ssp_port_read(ssp, port, reg) & ~(mask)) | (bits))
+
+#define ssp_port_clr_bits(ssp, port, reg, bits) \
+ ssp_port_rmw(ssp, port, reg, bits, 0)
+
+#define ssp_port_set_bits(ssp, port, reg, bits) \
+ ssp_port_rmw(ssp, port, reg, 0, bits)
+
+struct ti_ssp {
+ struct resource *res;
+ void __iomem *regs;
+ struct timer_list timer;
+ struct ti_ssp_port *ports[2];
+ spinlock_t lock;
+ struct clk *clk;
+ struct device *dev;
+};
+
+struct ti_ssp_port {
+ int num;
+ struct ti_ssp *ssp;
+ spinlock_t lock;
+};
+
+struct ti_ssp_port *ti_ssp_open(const struct ti_ssp_port_data *data)
+{
+ struct ti_ssp *ssp;
+ struct ti_ssp_port *port;
+ struct device *dev;
+ int error = 0;
+
+ dev = bus_find_device_by_name(&platform_bus_type, NULL,
+ data->ssp_dev_name);
+ if (!dev || !dev->driver)
+ return ERR_PTR(-ENODEV);
+
+ if (!get_device(dev))
+ return ERR_PTR(-ENODEV);
+
+ ssp = platform_get_drvdata(to_platform_device(dev));
+ if (!ssp) {
+ error = -ENODEV;
+ goto error_put;
+ }
+
+ port = kzalloc(sizeof(*port), GFP_KERNEL);
+ if (!port) {
+ error = -ENOMEM;
+ goto error_put;
+ }
+
+ port->num = data->port;
+ port->ssp = ssp;
+ spin_lock_init(&port->lock);
+
+ spin_lock(&ssp->lock);
+
+ if (ssp->ports[port->num]) {
+ error = -EBUSY;
+ goto error_unlock;
+ }
+
+ ssp->ports[port->num] = port;
+
+ spin_unlock(&ssp->lock);
+
+ ti_ssp_set_iosel(port, data->iosel);
+
+ spin_lock(&port->lock);
+ ssp_port_rmw(ssp, port->num, CFG_1, SSP_PORT_CONFIG_MASK,
+ data->config);
+ ssp_port_rmw(ssp, port->num, CFG_2, SSP_PORT_CLKRATE_MASK, 0);
+ spin_unlock(&port->lock);
+
+ return port;
+
+error_unlock:
+ spin_unlock(&ssp->lock);
+error_put:
+ put_device(dev);
+ return ERR_PTR(error);
+}
+EXPORT_SYMBOL(ti_ssp_open);
+
+int ti_ssp_close(struct ti_ssp_port *port)
+{
+ if (!port || !port->ssp)
+ return -EINVAL;
+ port->ssp->ports[port->num] = NULL;
+ put_device(port->ssp->dev);
+ kfree(port);
+ return 0;
+}
+EXPORT_SYMBOL(ti_ssp_close);
+
+int ti_ssp_set_mode(struct ti_ssp_port *port, int mode)
+{
+ if (!port || !port->ssp)
+ return -EINVAL;
+
+ spin_lock(&port->lock);
+ mode &= SSP_PORT_CONFIG_MASK;
+ ssp_port_rmw(port->ssp, port->num, CFG_1, SSP_PORT_CONFIG_MASK, mode);
+ spin_unlock(&port->lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(ti_ssp_set_mode);
+
+int ti_ssp_set_iosel(struct ti_ssp_port *port, u32 iosel)
+{
+ unsigned int val;
+
+ if (!port || !port->ssp)
+ return -EINVAL;
+
+ spin_lock(&port->lock);
+
+ /* IOSEL1 gets the least significant 16 bits */
+ val = ssp_read(port->ssp, IOSEL_1);
+ val &= 0xffff << (port->num ? 0 : 16);
+ val |= (iosel & 0xffff) << (port->num ? 16 : 0);
+ ssp_write(port->ssp, IOSEL_1, val);
+
+ /* IOSEL2 gets the most significant 16 bits */
+ val = ssp_read(port->ssp, IOSEL_2);
+ val &= 0x0007 << (port->num ? 0 : 16);
+ val |= (iosel & 0x00070000) >> (port->num ? 0 : 16);
+ ssp_write(port->ssp, IOSEL_2, val);
+
+ spin_unlock(&port->lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(ti_ssp_set_iosel);
+
+int ti_ssp_load(struct ti_ssp_port *port, int offs, u32* prog, int len)
+{
+ int i;
+
+ if (!port || !port->ssp)
+ return -EINVAL;
+
+ if (len > SSP_PORT_SEQRAM_SIZE)
+ return -ENOSPC;
+
+ spin_lock(&port->lock);
+
+ /* Enable SeqRAM access */
+ ssp_port_set_bits(port->ssp, port->num, CFG_2, SSP_SEQRAM_WR_EN);
+
+ /* Copy code */
+ for (i = 0; i < len; i++) {
+ __raw_writel(prog[i], port->ssp->regs + offs + 4*i +
+ ssp_port_seqram[port->num]);
+ }
+
+ /* Disable SeqRAM access */
+ ssp_port_clr_bits(port->ssp, port->num, CFG_2, SSP_SEQRAM_WR_EN);
+
+ spin_unlock(&port->lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(ti_ssp_load);
+
+int ti_ssp_raw_read(struct ti_ssp_port *port)
+{
+ u32 val;
+
+ if (!port || !port->ssp)
+ return -EINVAL;
+
+ val = ssp_read(port->ssp, IOSEL_2);
+ val >>= (port->num ? 27 : 11);
+
+ return val & 0x0f;
+}
+EXPORT_SYMBOL(ti_ssp_raw_read);
+
+int ti_ssp_raw_write(struct ti_ssp_port *port, u32 val)
+{
+ u32 mask;
+
+ if (!port || !port->ssp)
+ return -EINVAL;
+
+ spin_lock(&port->ssp->lock);
+ val &= 0x0f;
+ val <<= (port->num ? 22 : 6);
+ mask = 0x0f;
+ mask <<= (port->num ? 22 : 6);
+ ssp_rmw(port->ssp, IOSEL_2, mask, val);
+ spin_unlock(&port->ssp->lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(ti_ssp_raw_write);
+
+int ti_ssp_run(struct ti_ssp_port *port, u32 pc, u32 input, u32 *output)
+{
+ struct ti_ssp *ssp;
+ int count;
+
+ if (!port || !port->ssp)
+ return -EINVAL;
+ ssp = port->ssp;
+
+ if (pc & ~(0x3f))
+ return -EINVAL;
+
+ ssp_port_write(ssp, port->num, ADDR, input >> 16);
+ ssp_port_write(ssp, port->num, DATA, input & 0xffff);
+ ssp_port_rmw(ssp, port->num, CFG_1, 0x3f, pc);
+
+ ssp_port_set_bits(ssp, port->num, CFG_1, SSP_START);
+
+ for (count = 10000; count; count--) {
+ if ((ssp_port_read(ssp, port->num, CFG_1) & SSP_BUSY) == 0)
+ break;
+ udelay(1);
+ }
+
+ if (output) {
+ *(output) = (ssp_port_read(ssp, port->num, ADDR) << 16) |
+ (ssp_port_read(ssp, port->num, DATA) & 0xffff);
+ }
+
+ if (!count) {
+ dev_err(ssp->dev, "timed out waiting for SSP operation\n");
+ return -EIO;
+ }
+
+ /* return stop address */
+ return ssp_port_read(ssp, port->num, STATE) & 0x3f;
+}
+EXPORT_SYMBOL(ti_ssp_run);
+
+static int __devinit ti_ssp_probe(struct platform_device *pdev)
+{
+ static struct ti_ssp *ssp;
+ const struct ti_ssp_data *pdata = pdev->dev.platform_data;
+ int ret = 0, prediv = 0xff;
+ unsigned long sysclk;
+ struct device *dev = &pdev->dev;
+
+ ssp = kzalloc(sizeof(*ssp), GFP_KERNEL);
+ if (!ssp) {
+ dev_err(dev, "cannot allocate device info\n");
+ return -ENOMEM;
+ }
+
+ ssp->dev = dev;
+ platform_set_drvdata(pdev, ssp);
+
+ ret = -ENODEV;
+ ssp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!ssp->res) {
+ dev_err(dev, "cannot determine register area\n");
+ goto error_res;
+ }
+
+ ret = -EINVAL;
+ if (!request_mem_region(ssp->res->start, resource_size(ssp->res),
+ pdev->name)) {
+ dev_err(dev, "cannot claim register memory\n");
+ goto error_res;
+ }
+
+ ret = -ENOMEM;
+ ssp->regs = ioremap(ssp->res->start, resource_size(ssp->res));
+ if (!ssp->regs) {
+ dev_err(dev, "cannot map register memory\n");
+ goto error_map;
+ }
+
+ ret = -EINVAL;
+ ssp->clk = clk_get(dev, NULL);
+ if (IS_ERR(ssp->clk)) {
+ dev_err(dev, "cannot claim device clock\n");
+ goto error_clk;
+ }
+
+ spin_lock_init(&ssp->lock);
+
+ platform_set_drvdata(pdev, ssp);
+
+ /* Power on and initialize SSP */
+ ret = clk_enable(ssp->clk);
+ if (ret)
+ goto error_enable;
+
+ /* Reset registers to a sensible known state */
+ ssp_write(ssp, IOSEL_1, 0);
+ ssp_write(ssp, IOSEL_2, 0);
+ ssp_write(ssp, INTR_EN, 0);
+ ssp_write(ssp, TEST_CTRL, 0);
+ ssp_port_write(ssp, 0, CFG_1, SSP_PORT_ASL);
+ ssp_port_write(ssp, 1, CFG_1, SSP_PORT_ASL);
+ ssp_port_write(ssp, 0, CFG_2, SSP_PORT_CFO1);
+ ssp_port_write(ssp, 1, CFG_2, SSP_PORT_CFO1);
+
+ sysclk = clk_get_rate(ssp->clk);
+ if (pdata && pdata->out_clock)
+ prediv = (sysclk / pdata->out_clock) - 1;
+ prediv = clamp(prediv, 0, 0xff);
+ ssp_rmw(ssp, PREDIV, 0xff, prediv);
+
+ return 0;
+
+error_enable:
+ clk_put(ssp->clk);
+error_clk:
+ iounmap(ssp->regs);
+error_map:
+ release_mem_region(ssp->res->start, resource_size(ssp->res));
+error_res:
+ kfree(ssp);
+ return ret;
+}
+
+static int __devexit ti_ssp_remove(struct platform_device *pdev)
+{
+ struct ti_ssp *ssp = platform_get_drvdata(pdev);
+
+ clk_disable(ssp->clk);
+ clk_put(ssp->clk);
+ iounmap(ssp->regs);
+ release_mem_region(ssp->res->start, resource_size(ssp->res));
+ kfree(ssp);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static struct platform_driver ti_ssp_driver = {
+ .probe = ti_ssp_probe,
+ .remove = __devexit_p(ti_ssp_remove),
+ .driver.name = "ti-ssp",
+ .driver.owner = THIS_MODULE,
+};
+
+static int __init ti_ssp_init(void)
+{
+ return platform_driver_register(&ti_ssp_driver);
+}
+
+static void __exit ti_ssp_exit(void)
+{
+ platform_driver_unregister(&ti_ssp_driver);
+}
+
+arch_initcall_sync(ti_ssp_init);
+module_exit(ti_ssp_exit);
+
+MODULE_AUTHOR("Cyril Chemparathy");
+MODULE_DESCRIPTION("Sequencer Serial Port (SSP) Driver");
+MODULE_ALIAS("platform:ti_ssp");
+MODULE_LICENSE("GPL");
--
1.7.0.4
_______________________________________________
Davinci-linux-open-source mailing list
Davinci-linux-open-source@linux.davincidsp.com
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
