aboutsummaryrefslogtreecommitdiff
path: root/drivers/video/mmp
diff options
context:
space:
mode:
authorZhou Zhu <zzhu3@marvell.com>2013-02-21 16:42:18 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-21 17:22:17 -0800
commit641b4b1b6a7cb4ab21cfd9dd7b93a1162eae4501 (patch)
treea429ff233c1ce30034cf825e6b3b945c0368eee8 /drivers/video/mmp
parent3c76f15fd5027474bf738e0a145337370d9c7a8c (diff)
downloadvexpress-lsk-641b4b1b6a7cb4ab21cfd9dd7b93a1162eae4501.tar.gz
video: mmpdisp: add spi port in display controller
Add spi port support in mmp display controller. This port is from display controller and for panel usage. This driver implemented and registered as a spi master. Signed-off-by: Zhou Zhu <zzhu3@marvell.com> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Cc: Lisa Du <cldu@marvell.com> Cc: Guoqing Li <ligq@marvell.com> Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/mmp')
-rw-r--r--drivers/video/mmp/hw/Kconfig8
-rw-r--r--drivers/video/mmp/hw/Makefile1
-rw-r--r--drivers/video/mmp/hw/mmp_ctrl.c6
-rw-r--r--drivers/video/mmp/hw/mmp_ctrl.h4
-rw-r--r--drivers/video/mmp/hw/mmp_spi.c180
5 files changed, 199 insertions, 0 deletions
diff --git a/drivers/video/mmp/hw/Kconfig b/drivers/video/mmp/hw/Kconfig
index 6c1dd34e8cf..02f109a20cd 100644
--- a/drivers/video/mmp/hw/Kconfig
+++ b/drivers/video/mmp/hw/Kconfig
@@ -9,4 +9,12 @@ config MMP_DISP_CONTROLLER
this controller is used on Marvell PXA910,
MMP2, MMP3, PXA988 chips
+config MMP_DISP_SPI
+ bool "mmp display controller spi port"
+ depends on MMP_DISP_CONTROLLER && SPI_MASTER
+ default y
+ help
+ Marvell MMP display hw controller spi port support
+ will register as a spi master for panel usage
+
endif
diff --git a/drivers/video/mmp/hw/Makefile b/drivers/video/mmp/hw/Makefile
index f34ace82888..0000a714fed 100644
--- a/drivers/video/mmp/hw/Makefile
+++ b/drivers/video/mmp/hw/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_MMP_DISP_CONTROLLER) += mmp_ctrl.o
+obj-$(CONFIG_MMP_DISP_SPI) += mmp_spi.o
diff --git a/drivers/video/mmp/hw/mmp_ctrl.c b/drivers/video/mmp/hw/mmp_ctrl.c
index 1b5d2999231..4bd31b2af39 100644
--- a/drivers/video/mmp/hw/mmp_ctrl.c
+++ b/drivers/video/mmp/hw/mmp_ctrl.c
@@ -535,6 +535,12 @@ static int mmphw_probe(struct platform_device *pdev)
}
}
+#ifdef CONFIG_MMP_DISP_SPI
+ ret = lcd_spi_register(ctrl);
+ if (ret < 0)
+ goto failed_path_init;
+#endif
+
dev_info(ctrl->dev, "device init done\n");
return 0;
diff --git a/drivers/video/mmp/hw/mmp_ctrl.h b/drivers/video/mmp/hw/mmp_ctrl.h
index b125f53336f..6408d8ef3ab 100644
--- a/drivers/video/mmp/hw/mmp_ctrl.h
+++ b/drivers/video/mmp/hw/mmp_ctrl.h
@@ -1967,4 +1967,8 @@ static inline struct lcd_regs *path_regs(struct mmp_path *path)
return NULL;
}
}
+
+#ifdef CONFIG_MMP_DISP_SPI
+extern int lcd_spi_register(struct mmphw_ctrl *ctrl);
+#endif
#endif /* _MMP_CTRL_H_ */
diff --git a/drivers/video/mmp/hw/mmp_spi.c b/drivers/video/mmp/hw/mmp_spi.c
new file mode 100644
index 00000000000..e62ca7bf0d5
--- /dev/null
+++ b/drivers/video/mmp/hw/mmp_spi.c
@@ -0,0 +1,180 @@
+/*
+ * linux/drivers/video/mmp/hw/mmp_spi.c
+ * using the spi in LCD controler for commands send
+ *
+ * Copyright (C) 2012 Marvell Technology Group Ltd.
+ * Authors: Guoqing Li <ligq@marvell.com>
+ * Lisa Du <cldu@marvell.com>
+ * Zhou Zhu <zzhu3@marvell.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; 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/spi/spi.h>
+#include "mmp_ctrl.h"
+
+/**
+ * spi_write - write command to the SPI port
+ * @data: can be 8/16/32-bit, MSB justified data to write.
+ * @len: data length.
+ *
+ * Wait bus transfer complete IRQ.
+ * The caller is expected to perform the necessary locking.
+ *
+ * Returns:
+ * %-ETIMEDOUT timeout occurred
+ * 0 success
+ */
+static inline int lcd_spi_write(struct spi_device *spi, u32 data)
+{
+ int timeout = 100000, isr, ret = 0;
+ u32 tmp;
+ void *reg_base =
+ *(void **)spi_master_get_devdata(spi->master);
+
+ /* clear ISR */
+ writel_relaxed(~SPI_IRQ_MASK, reg_base + SPU_IRQ_ISR);
+
+ switch (spi->bits_per_word) {
+ case 8:
+ writel_relaxed((u8)data, reg_base + LCD_SPU_SPI_TXDATA);
+ break;
+ case 16:
+ writel_relaxed((u16)data, reg_base + LCD_SPU_SPI_TXDATA);
+ break;
+ case 32:
+ writel_relaxed((u32)data, reg_base + LCD_SPU_SPI_TXDATA);
+ break;
+ default:
+ dev_err(&spi->dev, "Wrong spi bit length\n");
+ }
+
+ /* SPI start to send command */
+ tmp = readl_relaxed(reg_base + LCD_SPU_SPI_CTRL);
+ tmp &= ~CFG_SPI_START_MASK;
+ tmp |= CFG_SPI_START(1);
+ writel(tmp, reg_base + LCD_SPU_SPI_CTRL);
+
+ isr = readl_relaxed(reg_base + SPU_IRQ_ISR);
+ while (!(isr & SPI_IRQ_ENA_MASK)) {
+ udelay(100);
+ isr = readl_relaxed(reg_base + SPU_IRQ_ISR);
+ if (!--timeout) {
+ ret = -ETIMEDOUT;
+ dev_err(&spi->dev, "spi cmd send time out\n");
+ break;
+ }
+ }
+
+ tmp = readl_relaxed(reg_base + LCD_SPU_SPI_CTRL);
+ tmp &= ~CFG_SPI_START_MASK;
+ tmp |= CFG_SPI_START(0);
+ writel_relaxed(tmp, reg_base + LCD_SPU_SPI_CTRL);
+
+ writel_relaxed(~SPI_IRQ_MASK, reg_base + SPU_IRQ_ISR);
+
+ return ret;
+}
+
+static int lcd_spi_setup(struct spi_device *spi)
+{
+ void *reg_base =
+ *(void **)spi_master_get_devdata(spi->master);
+ u32 tmp;
+
+ tmp = CFG_SCLKCNT(16) |
+ CFG_TXBITS(spi->bits_per_word) |
+ CFG_SPI_SEL(1) | CFG_SPI_ENA(1) |
+ CFG_SPI_3W4WB(1);
+ writel(tmp, reg_base + LCD_SPU_SPI_CTRL);
+
+ /*
+ * After set mode it need a time to pull up the spi singals,
+ * or it would cause the wrong waveform when send spi command,
+ * especially on pxa910h
+ */
+ tmp = readl_relaxed(reg_base + SPU_IOPAD_CONTROL);
+ if ((tmp & CFG_IOPADMODE_MASK) != IOPAD_DUMB18SPI)
+ writel_relaxed(IOPAD_DUMB18SPI |
+ (tmp & ~CFG_IOPADMODE_MASK),
+ reg_base + SPU_IOPAD_CONTROL);
+ udelay(20);
+ return 0;
+}
+
+static int lcd_spi_one_transfer(struct spi_device *spi, struct spi_message *m)
+{
+ struct spi_transfer *t;
+ int i;
+
+ list_for_each_entry(t, &m->transfers, transfer_list) {
+ switch (spi->bits_per_word) {
+ case 8:
+ for (i = 0; i < t->len; i++)
+ lcd_spi_write(spi, ((u8 *)t->tx_buf)[i]);
+ break;
+ case 16:
+ for (i = 0; i < t->len/2; i++)
+ lcd_spi_write(spi, ((u16 *)t->tx_buf)[i]);
+ break;
+ case 32:
+ for (i = 0; i < t->len/4; i++)
+ lcd_spi_write(spi, ((u32 *)t->tx_buf)[i]);
+ break;
+ default:
+ dev_err(&spi->dev, "Wrong spi bit length\n");
+ }
+ }
+
+ m->status = 0;
+ if (m->complete)
+ m->complete(m->context);
+ return 0;
+}
+
+int lcd_spi_register(struct mmphw_ctrl *ctrl)
+{
+ struct spi_master *master;
+ void **p_regbase;
+ int err;
+
+ master = spi_alloc_master(ctrl->dev, sizeof(void *));
+ if (!master) {
+ dev_err(ctrl->dev, "unable to allocate SPI master\n");
+ return -ENOMEM;
+ }
+ p_regbase = spi_master_get_devdata(master);
+ *p_regbase = ctrl->reg_base;
+
+ /* set bus num to 5 to avoid conflict with other spi hosts */
+ master->bus_num = 5;
+ master->num_chipselect = 1;
+ master->setup = lcd_spi_setup;
+ master->transfer = lcd_spi_one_transfer;
+
+ err = spi_register_master(master);
+ if (err < 0) {
+ dev_err(ctrl->dev, "unable to register SPI master\n");
+ spi_master_put(master);
+ return err;
+ }
+
+ dev_info(&master->dev, "registered\n");
+
+ return 0;
+}