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[Linux-fbdev-devel] [PATCH 1/8] pxa: support pxa168 LCD controller SPI operation
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From: Jun N. <nie...@gm...> - 2009-11-16 09:34:25
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>From 40bb744e91d8058faa38fb953ade1964c865e846 Mon Sep 17 00:00:00 2001
From: Jun Nie <nj...@ma...>
Date: Fri, 13 Nov 2009 14:02:20 +0800
Subject: [PATCH] pxa: support pxa168 LCD controller SPI operation
Signed-off-by: Jun Nie <nj...@ma...>
---
drivers/video/pxa168fb.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/video/pxa168fb.h | 24 +-------------
include/video/pxa168fb.h | 47 ++++++++++++++++++++++++++
3 files changed, 129 insertions(+), 23 deletions(-)
diff --git a/drivers/video/pxa168fb.c b/drivers/video/pxa168fb.c
index 84d8327..aec95c4 100644
--- a/drivers/video/pxa168fb.c
+++ b/drivers/video/pxa168fb.c
@@ -27,12 +27,90 @@
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/uaccess.h>
+#include <linux/gpio.h>
#include <video/pxa168fb.h>
#include "pxa168fb.h"
#define DEFAULT_REFRESH 60 /* Hz */
+static inline void spi_gpio_assert(int spi_gpio_cs, int val)
+{
+ if (gpio_is_valid(spi_gpio_cs))
+ gpio_set_value(spi_gpio_cs, val);
+}
+
+int pxa168fb_spi_send(struct pxa168fb_info *fbi, void *value, int count,
+ unsigned int spi_gpio_cs, unsigned int cs_active,
+ unsigned int interval_us)
+{
+ u32 x, spi_byte_len;
+ u8 *cmd = (u8 *)value;
+ int i, isr, iopad, ret = 0;
+
+ if (gpio_is_valid(spi_gpio_cs)) {
+ ret = gpio_direction_output(spi_gpio_cs, !cs_active);
+ if (ret)
+ goto spi_exit;
+ }
+ spi_byte_len = readl(fbi->reg_base + LCD_SPU_SPI_CTRL);
+ spi_byte_len = (spi_byte_len >> 8) & 0xff;
+ /* Alignment should be (spi_byte_len + 7) >> 3, but
+ * spi controller request set one less than bit length */
+ spi_byte_len = (spi_byte_len + 8) >> 3;
+ /* spi command provided by platform should be 1, 2, or 4 byte aligned */
+ if (3 == spi_byte_len)
+ spi_byte_len = 4;
+
+ iopad = readl(fbi->reg_base + SPU_IOPAD_CONTROL);
+ if ((iopad & CFG_IOPADMODE_MASK) != PIN_MODE_DUMB_18_SPI)
+ writel(PIN_MODE_DUMB_18_SPI, fbi->reg_base + SPU_IOPAD_CONTROL);
+ isr = readl(fbi->reg_base + SPU_IRQ_ISR);
+ writel((isr & ~SPI_IRQ_ENA_MASK), fbi->reg_base + SPU_IRQ_ISR);
+ for (i = 0; i < count; i++) {
+ spi_gpio_assert(spi_gpio_cs, cs_active);
+ udelay(interval_us);
+ switch (spi_byte_len) {
+ case 1:
+ writel(*cmd, fbi->reg_base + LCD_SPU_SPI_TXDATA);
+ break;
+ case 2:
+ writel(*(u16 *)cmd, fbi->reg_base + LCD_SPU_SPI_TXDATA);
+ break;
+ case 4:
+ writel(*(u32 *)cmd, fbi->reg_base + LCD_SPU_SPI_TXDATA);
+ break;
+ default:
+ dev_err(fbi->dev, "Wrong spi bit length\n");
+ spi_gpio_assert(spi_gpio_cs, !cs_active);
+ ret = -EINVAL;
+ goto spi_exit;
+ }
+ cmd += spi_byte_len;
+ x = readl(fbi->reg_base + LCD_SPU_SPI_CTRL);
+ x |= CFG_SPI_START_MASK;
+ writel(x, fbi->reg_base + LCD_SPU_SPI_CTRL);
+ isr = readl(fbi->reg_base + SPU_IRQ_ISR);
+ while (!(isr & SPI_IRQ_ENA_MASK)) {
+ udelay(1);
+ isr = readl(fbi->reg_base + SPU_IRQ_ISR);
+ }
+ x = readl(fbi->reg_base + LCD_SPU_SPI_CTRL);
+ x &= ~CFG_SPI_START_MASK;
+ writel(x, fbi->reg_base + LCD_SPU_SPI_CTRL);
+ spi_gpio_assert(spi_gpio_cs, !cs_active);
+ }
+
+spi_exit:
+ if (gpio_is_valid(spi_gpio_cs))
+ gpio_direction_input(spi_gpio_cs);
+ if ((iopad & CFG_IOPADMODE_MASK) != PIN_MODE_DUMB_18_SPI)
+ writel(iopad, fbi->reg_base + SPU_IOPAD_CONTROL);
+
+ return ret;
+}
+EXPORT_SYMBOL(pxa168fb_spi_send);
+
static int determine_best_pix_fmt(struct fb_var_screeninfo *var)
{
/*
@@ -728,6 +806,9 @@ static int __init pxa168fb_probe(struct
platform_device *pdev)
writel(0, fbi->reg_base + LCD_SPU_SRAM_PARA0);
writel(CFG_CSB_256x32(0x1)|CFG_CSB_256x24(0x1)|CFG_CSB_256x8(0x1),
fbi->reg_base + LCD_SPU_SRAM_PARA1);
+ if ((mi->spi_ctrl != -1) && (mi->spi_ctrl & CFG_SPI_ENA_MASK))
+ writel(mi->spi_ctrl, fbi->reg_base + LCD_SPU_SPI_CTRL);
+
/*
* Allocate color map.
diff --git a/drivers/video/pxa168fb.h b/drivers/video/pxa168fb.h
index eee0927..55ec4dc 100644
--- a/drivers/video/pxa168fb.h
+++ b/drivers/video/pxa168fb.h
@@ -170,29 +170,7 @@
#define DMA_FRAME_CNT_MASK 0x00000003 /* Video */
/* SPI Control Register. */
-#define LCD_SPU_SPI_CTRL 0x0180
-#define CFG_SCLKCNT(div) ((div) << 24) /* 0xFF~0x2 */
-#define CFG_SCLKCNT_MASK 0xFF000000
-#define CFG_RXBITS(rx) ((rx) << 16) /* 0x1F~0x1 */
-#define CFG_RXBITS_MASK 0x00FF0000
-#define CFG_TXBITS(tx) ((tx) << 8) /* 0x1F~0x1 */
-#define CFG_TXBITS_MASK 0x0000FF00
-#define CFG_CLKINV(clk) ((clk) << 7)
-#define CFG_CLKINV_MASK 0x00000080
-#define CFG_KEEPXFER(transfer) ((transfer) << 6)
-#define CFG_KEEPXFER_MASK 0x00000040
-#define CFG_RXBITSTO0(rx) ((rx) << 5)
-#define CFG_RXBITSTO0_MASK 0x00000020
-#define CFG_TXBITSTO0(tx) ((tx) << 4)
-#define CFG_TXBITSTO0_MASK 0x00000010
-#define CFG_SPI_ENA(spi) ((spi) << 3)
-#define CFG_SPI_ENA_MASK 0x00000008
-#define CFG_SPI_SEL(spi) ((spi) << 2)
-#define CFG_SPI_SEL_MASK 0x00000004
-#define CFG_SPI_3W4WB(wire) ((wire) << 1)
-#define CFG_SPI_3W4WB_MASK 0x00000002
-#define CFG_SPI_START(start) (start)
-#define CFG_SPI_START_MASK 0x00000001
+/* For SPI register, please refer to include/video/pxa168fb.h */
/* SPI Tx Data Register */
#define LCD_SPU_SPI_TXDATA 0x0184
diff --git a/include/video/pxa168fb.h b/include/video/pxa168fb.h
index b5cc72f..01c18bc 100644
--- a/include/video/pxa168fb.h
+++ b/include/video/pxa168fb.h
@@ -14,6 +14,32 @@
#include <linux/fb.h>
#include <linux/interrupt.h>
+/* SPI Control Register. */
+#define LCD_SPU_SPI_CTRL 0x0180
+#define CFG_SCLKCNT(div) ((div) << 24) /* 0xFF~0x2 */
+#define CFG_SCLKCNT_MASK 0xFF000000
+/* SPI RX/TX bit length, 0x1F~0x1, 0x1: 2bits ... 0x1F: 32bits */
+#define CFG_RXBITS(rx) ((rx - 1) << 16)
+#define CFG_RXBITS_MASK 0x00FF0000
+#define CFG_TXBITS(tx) ((tx - 1) << 8)
+#define CFG_TXBITS_MASK 0x0000FF00
+#define CFG_CLKINV(clk) ((clk) << 7)
+#define CFG_CLKINV_MASK 0x00000080
+#define CFG_KEEPXFER(transfer) ((transfer) << 6)
+#define CFG_KEEPXFER_MASK 0x00000040
+#define CFG_RXBITSTO0(rx) ((rx) << 5)
+#define CFG_RXBITSTO0_MASK 0x00000020
+#define CFG_TXBITSTO0(tx) ((tx) << 4)
+#define CFG_TXBITSTO0_MASK 0x00000010
+#define CFG_SPI_ENA(spi) ((spi) << 3)
+#define CFG_SPI_ENA_MASK 0x00000008
+#define CFG_SPI_SEL(spi) ((spi) << 2) /* 1: port1; 0: port0 */
+#define CFG_SPI_SEL_MASK 0x00000004
+#define CFG_SPI_3W4WB(wire) ((wire)<<1) /* 1: 3-wire; 0: 4-wire */
+#define CFG_SPI_3W4WB_MASK 0x00000002
+#define CFG_SPI_START(start) (start)
+#define CFG_SPI_START_MASK 0x00000001
+
/* Dumb interface */
#define PIN_MODE_DUMB_24 0
#define PIN_MODE_DUMB_18_SPI 1
@@ -122,6 +148,27 @@ struct pxa168fb_mach_info {
unsigned panel_rbswap:1;
unsigned active:1;
unsigned enable_lcd:1;
+ /*
+ * SPI control
+ */
+ unsigned int spi_ctrl;
+ unsigned int spi_gpio_cs;
+ unsigned int spi_gpio_reset;
+ /*
+ * power on/off function.
+ */
+ int (*pxa168fb_lcd_power)(struct pxa168fb_info *,
+ unsigned int, unsigned int, int);
};
+/* SPI utility for configure panel SPI command.
+ * value: command array, element should be 1, 2 or 4 byte aligned.
+ * count: command array length
+ * spi_gpio_cs: gpio number for spi chip select
+ * cs_active: CS active polarity for SPI transaction
+ * interval_us: time interval between two commands, us as unit */
+int pxa168fb_spi_send(struct pxa168fb_info *fbi, void *value, int count,
+ unsigned int spi_gpio_cs, unsigned int cs_active,
+ unsigned int interval_us);
+
#endif /* __ASM_MACH_PXA168FB_H */
--
1.5.4.3
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