sb/via/k8t890: add vga textmode code for k8m890 chrome igp.

Add initialisation for the VIA Chrome 9 IGP on the k8m890 through native code
and through the general vga infrastructure i committed a month or two ago.
Add videoram_size option for k8m890 and the Asus M2V-MX SE.

Now the Asus M2V-MX SE will magically come up with a working standard VGA
80x25 textmode.

Many thanks to the people who worked hard on the Asus M2V-MX SE, and all
of its components; this vga bringup was a breeze thanks to your hard work
for this excellently supported board. And separate thanks to Rudolf Marek
for spurring me on and for providing a register dump.

Signed-off-by: Luc Verhaegen <libv@skynet.be>
Acked-by: Peter Stuge <peter@stuge.se>

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4465 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

4 files changed, 222 insertions, 4 deletions

diff --git a/src/southbridge/via/k8t890/Config.lb b/src/southbridge/via/k8t890/Config.lb
index 27e80b92a7..72502c2d64 100644
--- a/src/southbridge/via/k8t890/Config.lb
+++ b/src/southbridge/via/k8t890/Config.lb
@@ -25,3 +25,4 @@ driver k8t890_host_ctrl.o
 driver k8t890_pcie.o
 driver k8t890_traf_ctrl.o
 driver k8t890_error.o
+driver k8m890_chrome.o
diff --git a/src/southbridge/via/k8t890/k8m890_chrome.c b/src/southbridge/via/k8t890/k8m890_chrome.c
new file mode 100644
index 0000000000..544b08e9d9
--- /dev/null
+++ b/src/southbridge/via/k8t890/k8m890_chrome.c
@@ -0,0 +1,179 @@
+/*
+ * Copyright (C)  2007-2009  Luc Verhaegen <libv@skynet.be>
+ *
+ * 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., 51
+ * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <string.h> /* for memset */
+#include "k8t890.h"
+
+#if CONFIG_VGA == 1
+#include <pc80/vga_io.h>
+#include <pc80/vga.h>
+#include <arch/io.h>
+
+/*
+ *
+ */
+static void
+chrome_vga_init(struct device *dev)
+{
+	vga_sr_write(0x10, 0x01); /* unlock extended regs */
+
+	vga_sr_mask(0x1A, 0x02, 0x02); /* enable mmio */
+
+	vga_sr_mask(0x1A, 0x40, 0x40); /* Software Reset */
+
+	vga_cr_mask(0x6A, 0x00, 0xC8); /* Disable CRTC2 & Simultaneous */
+
+	/* Make sure that non of the primary VGA overflow registers are set */
+	vga_cr_write(0x33, 0x00);
+	vga_cr_write(0x35, 0x00);
+	vga_cr_mask(0x11, 0x00, 0x30);
+
+	vga_sr_mask(0x16, 0x00, 0x40); /* Wire CRT to CRTC1 */
+	vga_cr_mask(0x36, 0x00, 0x30); /* Power on CRT */
+
+	/* Disable Extended Display Mode */
+	vga_sr_mask(0x15, 0x00, 0x02);
+
+	/* Disable Wrap-around */
+	vga_sr_mask(0x15, 0x00, 0x20);
+
+	/* Disable Extended Mode memory access */
+	vga_sr_mask(0x1A, 0x00, 0x08);
+
+	/* Make sure that we only touch CRTC1s DAC */
+	vga_sr_mask(0x1A, 0x00, 0x01);
+
+	/* Set up power to the clocks/crtcs */
+	vga_sr_mask(0x19, 0x7F, 0x7F); /* enable clock gating for all. */
+	vga_sr_mask(0x1B, 0xC0, 0xC0); /* secondary clock according to pm */
+	vga_sr_mask(0x1B, 0x20, 0x30); /* primary clock is always on */
+
+	/* set everything according to PM/Engine idle state except pci dma */
+	vga_sr_write(0x2D, 0xFF); /* Power management control 1 */
+	vga_sr_write(0x2E, 0xFB); /* Power management control 2 */
+	vga_sr_write(0x3F, 0xFF); /* Power management control 3 */
+
+	/* now set up the engine clock. */
+	vga_sr_write(0x47, 0xB8);
+	vga_sr_write(0x48, 0x08);
+	vga_sr_write(0x49, 0x03);
+
+	/* trigger engine clock setting */
+	vga_sr_mask(0x40, 0x01, 0x01);
+	vga_sr_mask(0x40, 0, 0x01);
+
+	vga_cr_mask(0x30, 0x04, 0x04); /* Enable PowerNow in primary path */
+	vga_cr_mask(0x36, 0x01, 0x01); /* Enable PCI Power Management */
+
+	/* Power now indicators... */
+	vga_cr_write(0x41, 0xB9);
+	vga_cr_write(0x42, 0xB4);
+	/* could these be the CRTC2 power now indicators? */
+	vga_cr_write(0x9D, 0x80); /* Power Now Ending position enable */
+	vga_cr_write(0x9E, 0xB4); /* Power Now Control 3 */
+
+	/* primary fifo setting */
+	vga_sr_mask(0x16, 0x28, 0xBF); /* pthreshold: 160 */
+	vga_sr_write(0x17, 0x60); /* max depth: 194 */
+	vga_sr_mask(0x18, 0x0E, 0xBF); /* high priority threshold: 56 */
+	vga_sr_write(0x1C, 0x54); /* Fetch count */
+
+	vga_sr_write(0x20, 0x40); /* display queue typical arbiter control 0 */
+	vga_sr_write(0x21, 0x40); /* display queue typical arbiter control 1 */
+	vga_sr_mask(0x22, 0x14, 0x1F); /* display queue expire number */
+
+	/* Typical Arbiter Control */
+	vga_sr_mask(0x41, 0x40, 0xF0); /* Request threshold */
+	vga_sr_mask(0x42, 0x20, 0x20); /* Support Fetch Cycle with Length 2 */
+
+	vga_sr_write(0x50, 0x1F); /* AGP Control Register */
+	vga_sr_write(0x51, 0xF5); /* AGP FIFO Control 1 */
+
+	vga_cr_mask(0x33, 0x08, 0x08); /* Enable Prefetch Mode */
+}
+
+#endif /* CONFIG_VGA */
+
+/*
+ *
+ */
+static void
+chrome_init(struct device *dev)
+{
+	uint32_t fb_size, fb_address;
+
+	fb_size = k8m890_host_fb_size_get();
+	if (!fb_size) {
+		printk_warning("Chrome: Device has not been initialised in the"
+			       " ramcontroller!\n");
+		return;
+	}
+
+	fb_address = pci_read_config32(dev, 0x10);
+	fb_address &= ~0x0F;
+	if (!fb_address) {
+		printk_warning("Chrome: No FB BAR assigned!\n");
+		return;
+	}
+
+	printk_info("Chrome: Using %dMB Framebuffer at 0x%08X.\n",
+		    fb_size, fb_address);
+
+	//k8m890_host_fb_direct_set(fb_address);
+
+#if CONFIG_VGA == 1
+	/* Now set up the VGA console */
+	vga_io_init(); /* Enable full IO access */
+
+	chrome_vga_init(dev);
+
+	vga_textmode_init();
+
+#if CONFIG_CONSOLE_VGA == 1
+	vga_console_init();
+#endif
+
+	printk_info("Chrome VGA Textmode initialized.\n");
+
+#if CONFIG_CONSOLE_VGA == 0
+	/* if we don't have console, at least print something... */
+	vga_line_write(0, "Chrome VGA Textmode initialized.");
+#endif
+
+#endif /* CONFIG_VGA */
+}
+
+static struct device_operations
+chrome_ops = {
+	.read_resources   = pci_dev_read_resources,
+	.set_resources    = pci_dev_set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.init             = chrome_init,
+	.scan_bus         = 0,
+	.enable           = 0,
+};
+
+static const struct pci_driver unichrome_driver __pci_driver = {
+	.ops    = &chrome_ops,
+	.vendor = 0x1106,
+	.device = 0x3230,
+};
diff --git a/src/southbridge/via/k8t890/k8t890.h b/src/southbridge/via/k8t890/k8t890.h
index 59d47ee52c..221aec7edb 100644
--- a/src/southbridge/via/k8t890/k8t890.h
+++ b/src/southbridge/via/k8t890/k8t890.h
@@ -43,4 +43,7 @@
 extern void writeback(struct device *dev, u16 where, u8 what);
 extern void dump_south(device_t dev);
 
+int k8m890_host_fb_size_get(void);
+//void k8m890_host_fb_direct_set(uint32_t fb_address);
+
 #endif
diff --git a/src/southbridge/via/k8t890/k8t890_dram.c b/src/southbridge/via/k8t890/k8t890_dram.c
index b32e5f870e..3a5d97ae2f 100644
--- a/src/southbridge/via/k8t890/k8t890_dram.c
+++ b/src/southbridge/via/k8t890/k8t890_dram.c
@@ -23,6 +23,7 @@
 #include <console/console.h>
 #include <cpu/x86/msr.h>
 #include <cpu/amd/mtrr.h>
+#include <pc80/mc146818rtc.h>
 #include <bitops.h>
 #include "k8t890.h"
 
@@ -104,18 +105,52 @@ extern uint64_t high_tables_base, high_tables_size;
 #endif
 }
 
+/*
+ *
+ */
+int
+k8m890_host_fb_size_get(void)
+{
+	struct device *dev = dev_find_device(PCI_VENDOR_ID_VIA,
+					     PCI_DEVICE_ID_VIA_K8M890CE_3, 0);
+	unsigned char tmp;
+
+	tmp = pci_read_config8(dev, 0xA1);
+	tmp >>= 4;
+	if (tmp & 0x08)
+		return 4 << (tmp & 7);
+	else
+		return 0;
+}
 
 static void dram_init_fb(struct device *dev)
 {
 	/* Important bits:
 	 * Enable the internal GFX bit 7 of reg 0xa1 plus in same reg:
-	 * bits 6:4 X fbuffer size will be  2^(X+2) or 100 = 64MB, 101 = 128MB 
+	 * bits 6:4 X fbuffer size will be  2^(X+2) or 100 = 64MB, 101 = 128MB
 	 * bits 3:0 BASE [31:28]
 	 * reg 0xa0 bits 7:1 BASE [27:21] bit0 enable CPU access
 	 */
 	u8 tmp;
 	uint64_t proposed_base;
-	unsigned int fbsize = (K8M890_FBSIZEMB * 1024 * 1024);
+	unsigned int fbbits = 0;
+	unsigned int fbsize;
+	int ret;
+
+
+	ret = get_option(&fbbits, "videoram_size");
+	if (ret) {
+		printk_warning("Failed to get videoram size (error %d), using default.\n", ret);
+		fbbits = 5;
+ 	}
+
+	if ((fbbits < 1) || (fbbits > 7)) {
+		printk_warning("Invalid videoram size (%d), using default.\n",
+			       4 << fbbits);
+		fbbits = 5;
+	}
+
+	fbsize = 4 << (fbbits + 20);
 
 	resmax = NULL;
 	search_global_resources(
@@ -131,13 +166,13 @@ static void dram_init_fb(struct device *dev)
 	proposed_base = resmax->base + resmax->size - fbsize;
 	resmax->size -= fbsize;
 
-	printk_debug("VIA FB proposed base: %llx\n", proposed_base);
+	printk_info("K8M890: Using a %dMB framebuffer.\n", 4 << fbbits);
 
 	/* Step 1: enable UMA but no FB */
 	pci_write_config8(dev, 0xa1, 0x80);
 
 	/* Step 2: enough is just the FB size, the CPU accessible address is not needed */
-	tmp = ((log2(K8M890_FBSIZEMB) - 2) << 4) | 0x80;
+	tmp = (fbbits << 4) | 0x80;
 	pci_write_config8(dev, 0xa1, tmp);
 
 	/* TODO K8 needs some UMA fine tuning too maybe call some generic routine here? */