From 5c06e2aa6339112befdc87b350b8bf712890d7a7 Mon Sep 17 00:00:00 2001 From: Ian Romanick Date: Fri, 9 Sep 2005 13:04:42 -0700 Subject: [PATCH] [PATCH] matroxfb: read MGA PInS data on PowerPC This updates the matroxfb code so that it can find the PInS data embedded in the BIOS on PowerPC cards. The process for finding the data is different on OpenFirmware cards than on x86 cards, and the code for doing so was missing. After patching, building, installing, and booting a kernel, you should grep for "PInS" in /var/log/messages. You should see two messages in the log: PInS data found at offset XXXXX PInS memtype = X On the GXT135p card I get "31168" and "5". The first value is irrelevant, but it's presence lets me know that the PInS data was actually found. On a GXT130p, the second value should be 3. Since I don't have access to that hardware, if someone can verify that, I will submit a follow-on patch that rips out all the memtype parameter stuff. Signed-off-by: Ian Romanick Signed-off-by: Petr Vandrovec Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/matrox/matroxfb_misc.c | 30 ++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/video/matrox/matroxfb_misc.c b/drivers/video/matrox/matroxfb_misc.c index a18dd024fc8..d9d3e9f6c08 100644 --- a/drivers/video/matrox/matroxfb_misc.c +++ b/drivers/video/matrox/matroxfb_misc.c @@ -68,6 +68,9 @@ * "David C. Hansen" * Fixes * + * "Ian Romanick" + * Find PInS data in BIOS on PowerPC systems. + * * (following author is not in any relation with this code, but his code * is included in this driver) * @@ -496,10 +499,35 @@ static void parse_bios(unsigned char __iomem* vbios, struct matrox_bios* bd) { get_bios_version(vbios, bd); get_bios_output(vbios, bd); get_bios_tvout(vbios, bd); +#if defined(__powerpc__) + /* On PowerPC cards, the PInS offset isn't stored at the end of the + * BIOS image. Instead, you must search the entire BIOS image for + * the magic PInS signature. + * + * This actually applies to all OpenFirmware base cards. Since these + * cards could be put in a MIPS or SPARC system, should the condition + * be something different? + */ + for ( pins_offset = 0 ; pins_offset <= 0xFF80 ; pins_offset++ ) { + unsigned char header[3]; + + header[0] = readb(vbios + pins_offset); + header[1] = readb(vbios + pins_offset + 1); + header[2] = readb(vbios + pins_offset + 2); + if ( (header[0] == 0x2E) && (header[1] == 0x41) + && ((header[2] == 0x40) || (header[2] == 0x80)) ) { + printk(KERN_INFO "PInS data found at offset %u\n", + pins_offset); + get_pins(vbios + pins_offset, bd); + break; + } + } +#else pins_offset = readb(vbios + 0x7FFC) | (readb(vbios + 0x7FFD) << 8); if (pins_offset <= 0xFF80) { get_pins(vbios + pins_offset, bd); } +#endif } #define get_u16(x) (le16_to_cpu(get_unaligned((__u16*)(x)))) @@ -755,6 +783,8 @@ void matroxfb_read_pins(WPMINFO2) { } #endif matroxfb_set_limits(PMINFO &ACCESS_FBINFO(bios)); + printk(KERN_INFO "PInS memtype = %u\n", + (ACCESS_FBINFO(values).reg.opt & 0x1C00) >> 10); } EXPORT_SYMBOL(matroxfb_DAC_in); -- 2.41.1