diff options
| -rw-r--r-- | drivers/video/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/video/mb862xx/Makefile | 5 | ||||
| -rw-r--r-- | drivers/video/mb862xx/mb862xx-i2c.c | 177 | ||||
| -rw-r--r-- | drivers/video/mb862xx/mb862xx_reg.h | 21 | ||||
| -rw-r--r-- | drivers/video/mb862xx/mb862xxfb.h | 9 | ||||
| -rw-r--r-- | drivers/video/mb862xx/mb862xxfbdrv.c (renamed from drivers/video/mb862xx/mb862xxfb.c) | 4 |
6 files changed, 224 insertions, 1 deletions
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 7326962565ce..549b960667c8 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -2294,6 +2294,15 @@ config FB_MB862XX_LIME endchoice +config FB_MB862XX_I2C + bool "Support I2C bus on MB862XX GDC" + depends on FB_MB862XX && I2C + default y + help + Selecting this option adds Coral-P(A)/Lime GDC I2C bus adapter + driver to support accessing I2C devices on controller's I2C bus. + These are usually some video decoder chips. + config FB_EP93XX tristate "EP93XX frame buffer support" depends on FB && ARCH_EP93XX diff --git a/drivers/video/mb862xx/Makefile b/drivers/video/mb862xx/Makefile index d7777714166b..5707ed0e31a7 100644 --- a/drivers/video/mb862xx/Makefile +++ b/drivers/video/mb862xx/Makefile @@ -2,4 +2,7 @@ # Makefile for the MB862xx framebuffer driver # -obj-$(CONFIG_FB_MB862XX) := mb862xxfb.o mb862xxfb_accel.o +obj-$(CONFIG_FB_MB862XX) += mb862xxfb.o + +mb862xxfb-y := mb862xxfbdrv.o mb862xxfb_accel.o +mb862xxfb-$(CONFIG_FB_MB862XX_I2C) += mb862xx-i2c.o diff --git a/drivers/video/mb862xx/mb862xx-i2c.c b/drivers/video/mb862xx/mb862xx-i2c.c new file mode 100644 index 000000000000..cb77d3b4657d --- /dev/null +++ b/drivers/video/mb862xx/mb862xx-i2c.c @@ -0,0 +1,177 @@ +/* + * Coral-P(A)/Lime I2C adapter driver + * + * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/fb.h> +#include <linux/i2c.h> +#include <linux/io.h> + +#include "mb862xxfb.h" +#include "mb862xx_reg.h" + +static int mb862xx_i2c_wait_event(struct i2c_adapter *adap) +{ + struct mb862xxfb_par *par = adap->algo_data; + u32 reg; + + do { + udelay(1); + reg = inreg(i2c, GC_I2C_BCR); + if (reg & (I2C_INT | I2C_BER)) + break; + } while (1); + + return (reg & I2C_BER) ? 0 : 1; +} + +static int mb862xx_i2c_do_address(struct i2c_adapter *adap, int addr) +{ + struct mb862xxfb_par *par = adap->algo_data; + + outreg(i2c, GC_I2C_DAR, addr); + outreg(i2c, GC_I2C_CCR, I2C_CLOCK_AND_ENABLE); + outreg(i2c, GC_I2C_BCR, par->i2c_rs ? I2C_REPEATED_START : I2C_START); + if (!mb862xx_i2c_wait_event(adap)) + return -EIO; + par->i2c_rs = !(inreg(i2c, GC_I2C_BSR) & I2C_LRB); + return par->i2c_rs; +} + +static int mb862xx_i2c_write_byte(struct i2c_adapter *adap, u8 byte) +{ + struct mb862xxfb_par *par = adap->algo_data; + + outreg(i2c, GC_I2C_DAR, byte); + outreg(i2c, GC_I2C_BCR, I2C_START); + if (!mb862xx_i2c_wait_event(adap)) + return -EIO; + return !(inreg(i2c, GC_I2C_BSR) & I2C_LRB); +} + +static int mb862xx_i2c_read_byte(struct i2c_adapter *adap, u8 *byte, int last) +{ + struct mb862xxfb_par *par = adap->algo_data; + + outreg(i2c, GC_I2C_BCR, I2C_START | (last ? 0 : I2C_ACK)); + if (!mb862xx_i2c_wait_event(adap)) + return 0; + *byte = inreg(i2c, GC_I2C_DAR); + return 1; +} + +void mb862xx_i2c_stop(struct i2c_adapter *adap) +{ + struct mb862xxfb_par *par = adap->algo_data; + + outreg(i2c, GC_I2C_BCR, I2C_STOP); + outreg(i2c, GC_I2C_CCR, I2C_DISABLE); + par->i2c_rs = 0; +} + +static int mb862xx_i2c_read(struct i2c_adapter *adap, struct i2c_msg *m) +{ + int i, ret = 0; + int last = m->len - 1; + + for (i = 0; i < m->len; i++) { + if (!mb862xx_i2c_read_byte(adap, &m->buf[i], i == last)) { + ret = -EIO; + break; + } + } + return ret; +} + +static int mb862xx_i2c_write(struct i2c_adapter *adap, struct i2c_msg *m) +{ + int i, ret = 0; + + for (i = 0; i < m->len; i++) { + if (!mb862xx_i2c_write_byte(adap, m->buf[i])) { + ret = -EIO; + break; + } + } + return ret; +} + +static int mb862xx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, + int num) +{ + struct mb862xxfb_par *par = adap->algo_data; + struct i2c_msg *m; + int addr; + int i = 0, err = 0; + + dev_dbg(par->dev, "%s: %d msgs\n", __func__, num); + + for (i = 0; i < num; i++) { + m = &msgs[i]; + if (!m->len) { + dev_dbg(par->dev, "%s: null msgs\n", __func__); + continue; + } + addr = m->addr; + if (m->flags & I2C_M_RD) + addr |= 1; + + err = mb862xx_i2c_do_address(adap, addr); + if (err < 0) + break; + if (m->flags & I2C_M_RD) + err = mb862xx_i2c_read(adap, m); + else + err = mb862xx_i2c_write(adap, m); + } + + if (i) + mb862xx_i2c_stop(adap); + + return (err < 0) ? err : i; +} + +static u32 mb862xx_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_SMBUS_BYTE_DATA; +} + +static const struct i2c_algorithm mb862xx_algo = { + .master_xfer = mb862xx_xfer, + .functionality = mb862xx_func, +}; + +static struct i2c_adapter mb862xx_i2c_adapter = { + .name = "MB862xx I2C adapter", + .algo = &mb862xx_algo, + .owner = THIS_MODULE, +}; + +int mb862xx_i2c_init(struct mb862xxfb_par *par) +{ + int ret; + + mb862xx_i2c_adapter.algo_data = par; + par->adap = &mb862xx_i2c_adapter; + + ret = i2c_add_adapter(par->adap); + if (ret < 0) { + dev_err(par->dev, "failed to add %s\n", + mb862xx_i2c_adapter.name); + } + return ret; +} + +void mb862xx_i2c_exit(struct mb862xxfb_par *par) +{ + if (par->adap) { + i2c_del_adapter(par->adap); + par->adap = NULL; + } +} diff --git a/drivers/video/mb862xx/mb862xx_reg.h b/drivers/video/mb862xx/mb862xx_reg.h index 737fc011caff..5784b018f15d 100644 --- a/drivers/video/mb862xx/mb862xx_reg.h +++ b/drivers/video/mb862xx/mb862xx_reg.h @@ -80,6 +80,27 @@ #define GC_DISP_REFCLK_400 400 +/* I2C */ +#define GC_I2C_BSR 0x00000000 /* BSR */ +#define GC_I2C_BCR 0x00000004 /* BCR */ +#define GC_I2C_CCR 0x00000008 /* CCR */ +#define GC_I2C_ADR 0x0000000C /* ADR */ +#define GC_I2C_DAR 0x00000010 /* DAR */ + +#define I2C_DISABLE 0x00000000 +#define I2C_STOP 0x00000000 +#define I2C_START 0x00000010 +#define I2C_REPEATED_START 0x00000030 +#define I2C_CLOCK_AND_ENABLE 0x0000003f +#define I2C_READY 0x01 +#define I2C_INT 0x01 +#define I2C_INTE 0x02 +#define I2C_ACK 0x08 +#define I2C_BER 0x80 +#define I2C_BEIE 0x40 +#define I2C_TRX 0x80 +#define I2C_LRB 0x10 + /* Carmine specific */ #define MB86297_DRAW_BASE 0x00020000 #define MB86297_DISP0_BASE 0x00100000 diff --git a/drivers/video/mb862xx/mb862xxfb.h b/drivers/video/mb862xx/mb862xxfb.h index d7e7cb76bbf2..d5dd7d9ec0cd 100644 --- a/drivers/video/mb862xx/mb862xxfb.h +++ b/drivers/video/mb862xx/mb862xxfb.h @@ -57,11 +57,20 @@ struct mb862xxfb_par { unsigned int refclk; /* disp. reference clock */ struct mb862xx_gc_mode *gc_mode; /* GDC mode init data */ int pre_init; /* don't init display if 1 */ + struct i2c_adapter *adap; /* GDC I2C bus adapter */ + int i2c_rs; u32 pseudo_palette[16]; }; extern void mb862xxfb_init_accel(struct fb_info *info, int xres); +#ifdef CONFIG_FB_MB862XX_I2C +extern int mb862xx_i2c_init(struct mb862xxfb_par *par); +extern void mb862xx_i2c_exit(struct mb862xxfb_par *par); +#else +static inline int mb862xx_i2c_init(struct mb862xxfb_par *par) { return 0; } +static inline void mb862xx_i2c_exit(struct mb862xxfb_par *par) { } +#endif #if defined(CONFIG_FB_MB862XX_LIME) && defined(CONFIG_FB_MB862XX_PCI_GDC) #error "Select Lime GDC or CoralP/Carmine support, but not both together" diff --git a/drivers/video/mb862xx/mb862xxfb.c b/drivers/video/mb862xx/mb862xxfbdrv.c index ffb6a2c36d3c..0cc20b4fbcb5 100644 --- a/drivers/video/mb862xx/mb862xxfb.c +++ b/drivers/video/mb862xx/mb862xxfbdrv.c @@ -772,6 +772,8 @@ static int coralp_init(struct mb862xxfb_par *par) } else { return -ENODEV; } + + mb862xx_i2c_init(par); return 0; } @@ -1029,6 +1031,8 @@ static void __devexit mb862xx_pci_remove(struct pci_dev *pdev) outreg(host, GC_IMASK, 0); } + mb862xx_i2c_exit(par); + device_remove_file(&pdev->dev, &dev_attr_dispregs); pci_set_drvdata(pdev, NULL); |