broadsheetfb: add MMIO hooks
Allow boards with GP-MMIO controllers to provide hooks to broadsheetfb in
order to offload cmd/data writes and data reads instead of relying only on
host based GPIO wiggling.
Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/broadsheetfb.c b/drivers/video/broadsheetfb.c
index 8f01106..57dc1a0 100644
--- a/drivers/video/broadsheetfb.c
+++ b/drivers/video/broadsheetfb.c
@@ -115,30 +115,30 @@
};
/* main broadsheetfb functions */
-static void broadsheet_issue_data(struct broadsheetfb_par *par, u16 data)
+static void broadsheet_gpio_issue_data(struct broadsheetfb_par *par, u16 data)
{
par->board->set_ctl(par, BS_WR, 0);
par->board->set_hdb(par, data);
par->board->set_ctl(par, BS_WR, 1);
}
-static void broadsheet_issue_cmd(struct broadsheetfb_par *par, u16 data)
+static void broadsheet_gpio_issue_cmd(struct broadsheetfb_par *par, u16 data)
{
par->board->set_ctl(par, BS_DC, 0);
- broadsheet_issue_data(par, data);
+ broadsheet_gpio_issue_data(par, data);
}
-static void broadsheet_send_command(struct broadsheetfb_par *par, u16 data)
+static void broadsheet_gpio_send_command(struct broadsheetfb_par *par, u16 data)
{
par->board->wait_for_rdy(par);
par->board->set_ctl(par, BS_CS, 0);
- broadsheet_issue_cmd(par, data);
+ broadsheet_gpio_issue_cmd(par, data);
par->board->set_ctl(par, BS_DC, 1);
par->board->set_ctl(par, BS_CS, 1);
}
-static void broadsheet_send_cmdargs(struct broadsheetfb_par *par, u16 cmd,
+static void broadsheet_gpio_send_cmdargs(struct broadsheetfb_par *par, u16 cmd,
int argc, u16 *argv)
{
int i;
@@ -146,15 +146,43 @@
par->board->wait_for_rdy(par);
par->board->set_ctl(par, BS_CS, 0);
- broadsheet_issue_cmd(par, cmd);
+ broadsheet_gpio_issue_cmd(par, cmd);
par->board->set_ctl(par, BS_DC, 1);
for (i = 0; i < argc; i++)
- broadsheet_issue_data(par, argv[i]);
+ broadsheet_gpio_issue_data(par, argv[i]);
par->board->set_ctl(par, BS_CS, 1);
}
-static void broadsheet_burst_write(struct broadsheetfb_par *par, int size,
+static void broadsheet_mmio_send_cmdargs(struct broadsheetfb_par *par, u16 cmd,
+ int argc, u16 *argv)
+{
+ int i;
+
+ par->board->mmio_write(par, BS_MMIO_CMD, cmd);
+
+ for (i = 0; i < argc; i++)
+ par->board->mmio_write(par, BS_MMIO_DATA, argv[i]);
+}
+
+static void broadsheet_send_command(struct broadsheetfb_par *par, u16 data)
+{
+ if (par->board->mmio_write)
+ par->board->mmio_write(par, BS_MMIO_CMD, data);
+ else
+ broadsheet_gpio_send_command(par, data);
+}
+
+static void broadsheet_send_cmdargs(struct broadsheetfb_par *par, u16 cmd,
+ int argc, u16 *argv)
+{
+ if (par->board->mmio_write)
+ broadsheet_mmio_send_cmdargs(par, cmd, argc, argv);
+ else
+ broadsheet_gpio_send_cmdargs(par, cmd, argc, argv);
+}
+
+static void broadsheet_gpio_burst_write(struct broadsheetfb_par *par, int size,
u16 *data)
{
int i;
@@ -174,7 +202,30 @@
par->board->set_ctl(par, BS_CS, 1);
}
-static u16 broadsheet_get_data(struct broadsheetfb_par *par)
+static void broadsheet_mmio_burst_write(struct broadsheetfb_par *par, int size,
+ u16 *data)
+{
+ int i;
+ u16 tmp;
+
+ for (i = 0; i < size; i++) {
+ tmp = (data[i] & 0x0F) << 4;
+ tmp |= (data[i] & 0x0F00) << 4;
+ par->board->mmio_write(par, BS_MMIO_DATA, tmp);
+ }
+
+}
+
+static void broadsheet_burst_write(struct broadsheetfb_par *par, int size,
+ u16 *data)
+{
+ if (par->board->mmio_write)
+ broadsheet_mmio_burst_write(par, size, data);
+ else
+ broadsheet_gpio_burst_write(par, size, data);
+}
+
+static u16 broadsheet_gpio_get_data(struct broadsheetfb_par *par)
{
u16 res;
/* wait for ready to go hi. (lo is busy) */
@@ -194,7 +245,16 @@
return res;
}
-static void broadsheet_write_reg(struct broadsheetfb_par *par, u16 reg,
+
+static u16 broadsheet_get_data(struct broadsheetfb_par *par)
+{
+ if (par->board->mmio_read)
+ return par->board->mmio_read(par);
+ else
+ return broadsheet_gpio_get_data(par);
+}
+
+static void broadsheet_gpio_write_reg(struct broadsheetfb_par *par, u16 reg,
u16 data)
{
/* wait for ready to go hi. (lo is busy) */
@@ -203,16 +263,34 @@
/* cs lo, dc lo for cmd, we lo for each data, db as usual */
par->board->set_ctl(par, BS_CS, 0);
- broadsheet_issue_cmd(par, BS_CMD_WR_REG);
+ broadsheet_gpio_issue_cmd(par, BS_CMD_WR_REG);
par->board->set_ctl(par, BS_DC, 1);
- broadsheet_issue_data(par, reg);
- broadsheet_issue_data(par, data);
+ broadsheet_gpio_issue_data(par, reg);
+ broadsheet_gpio_issue_data(par, data);
par->board->set_ctl(par, BS_CS, 1);
}
+static void broadsheet_mmio_write_reg(struct broadsheetfb_par *par, u16 reg,
+ u16 data)
+{
+ par->board->mmio_write(par, BS_MMIO_CMD, BS_CMD_WR_REG);
+ par->board->mmio_write(par, BS_MMIO_DATA, reg);
+ par->board->mmio_write(par, BS_MMIO_DATA, data);
+
+}
+
+static void broadsheet_write_reg(struct broadsheetfb_par *par, u16 reg,
+ u16 data)
+{
+ if (par->board->mmio_write)
+ broadsheet_mmio_write_reg(par, reg, data);
+ else
+ broadsheet_gpio_write_reg(par, reg, data);
+}
+
static void broadsheet_write_reg32(struct broadsheetfb_par *par, u16 reg,
u32 data)
{
@@ -223,8 +301,8 @@
static u16 broadsheet_read_reg(struct broadsheetfb_par *par, u16 reg)
{
- broadsheet_send_command(par, reg);
- msleep(100);
+ broadsheet_send_cmdargs(par, BS_CMD_RD_REG, 1, ®);
+ par->board->wait_for_rdy(par);
return broadsheet_get_data(par);
}
