[PATCH] ide: CS5535 driver

Signed-off-by: Jaya Kumar <jayakumar.ide@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

4 files changed, 316 insertions, 0 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index a737886e39d1..42e5b8175cbf 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -539,6 +539,15 @@ config BLK_DEV_CS5530
 
           It is safe to say Y to this question.
 
+config BLK_DEV_CS5535
+        tristate "AMD CS5535 chipset support"
+        depends on X86 && !X86_64
+        help
+          Include support for UDMA on the NSC/AMD CS5535 companion chipset.
+          This will automatically be detected and configured if found.
+
+          It is safe to say Y to this question.
+
 config BLK_DEV_HPT34X
         tristate "HPT34X chipset support"
         help
diff --git a/drivers/ide/pci/Makefile b/drivers/ide/pci/Makefile
index af46226c1796..f35d684edc25 100644
--- a/drivers/ide/pci/Makefile
+++ b/drivers/ide/pci/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_BLK_DEV_ATIIXP)		+= atiixp.o
 obj-$(CONFIG_BLK_DEV_CMD64X)            += cmd64x.o
 obj-$(CONFIG_BLK_DEV_CS5520)            += cs5520.o
 obj-$(CONFIG_BLK_DEV_CS5530)            += cs5530.o
+obj-$(CONFIG_BLK_DEV_CS5535)            += cs5535.o
 obj-$(CONFIG_BLK_DEV_SC1200)            += sc1200.o
 obj-$(CONFIG_BLK_DEV_CY82C693)          += cy82c693.o
 obj-$(CONFIG_BLK_DEV_HPT34X)            += hpt34x.o
diff --git a/drivers/ide/pci/cs5535.c b/drivers/ide/pci/cs5535.c
new file mode 100644
index 000000000000..6eb305197f3c
--- /dev/null
+++ b/drivers/ide/pci/cs5535.c
@@ -0,0 +1,305 @@
+/*
+ * linux/drivers/ide/pci/cs5535.c
+ *
+ * Copyright (C) 2004-2005 Advanced Micro Devices, Inc.
+ *
+ * History:
+ * 09/20/2005 - Jaya Kumar <jayakumar.ide@gmail.com>
+ * - Reworked tuneproc, set_drive, misc mods to prep for mainline
+ * - Work was sponsored by CIS (M) Sdn Bhd.
+ * Ported to Kernel 2.6.11 on June 26, 2005 by
+ *   Wolfgang Zuleger <wolfgang.zuleger@gmx.de>
+ *   Alexander Kiausch <alex.kiausch@t-online.de>
+ * Originally developed by AMD for 2.4/2.6
+ *
+ * Development of this chipset driver was funded
+ * by the nice folks at National Semiconductor/AMD.
+ *
+ * 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.
+ *
+ * Documentation:
+ *  CS5535 documentation available from AMD
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/ide.h>
+
+#include "ide-timing.h"
+
+#define MSR_ATAC_BASE           0x51300000
+#define ATAC_GLD_MSR_CAP        (MSR_ATAC_BASE+0)
+#define ATAC_GLD_MSR_CONFIG     (MSR_ATAC_BASE+0x01)
+#define ATAC_GLD_MSR_SMI        (MSR_ATAC_BASE+0x02)
+#define ATAC_GLD_MSR_ERROR      (MSR_ATAC_BASE+0x03)
+#define ATAC_GLD_MSR_PM         (MSR_ATAC_BASE+0x04)
+#define ATAC_GLD_MSR_DIAG       (MSR_ATAC_BASE+0x05)
+#define ATAC_IO_BAR             (MSR_ATAC_BASE+0x08)
+#define ATAC_RESET              (MSR_ATAC_BASE+0x10)
+#define ATAC_CH0D0_PIO          (MSR_ATAC_BASE+0x20)
+#define ATAC_CH0D0_DMA          (MSR_ATAC_BASE+0x21)
+#define ATAC_CH0D1_PIO          (MSR_ATAC_BASE+0x22)
+#define ATAC_CH0D1_DMA          (MSR_ATAC_BASE+0x23)
+#define ATAC_PCI_ABRTERR        (MSR_ATAC_BASE+0x24)
+#define ATAC_BM0_CMD_PRIM       0x00
+#define ATAC_BM0_STS_PRIM       0x02
+#define ATAC_BM0_PRD            0x04
+#define CS5535_CABLE_DETECT     0x48
+
+/* Format I PIO settings. We seperate out cmd and data for safer timings */
+
+static unsigned int cs5535_pio_cmd_timings[5] =
+{ 0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131 };
+static unsigned int cs5535_pio_dta_timings[5] =
+{ 0xF7F4, 0xF173, 0x8141, 0x5131, 0x1131 };
+
+static unsigned int cs5535_mwdma_timings[3] =
+{ 0x7F0FFFF3, 0x7F035352, 0x7f024241 };
+
+static unsigned int cs5535_udma_timings[5] =
+{ 0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061 };
+
+/* Macros to check if the register is the reset value -  reset value is an
+   invalid timing and indicates the register has not been set previously */
+
+#define CS5535_BAD_PIO(timings) ( (timings&~0x80000000UL) == 0x00009172 )
+#define CS5535_BAD_DMA(timings) ( (timings & 0x000FFFFF) == 0x00077771 )
+
+/****
+ *      cs5535_set_speed         -     Configure the chipset to the new speed
+ *      @drive: Drive to set up
+ *      @speed: desired speed
+ *
+ *      cs5535_set_speed() configures the chipset to a new speed.
+ */
+static void cs5535_set_speed(ide_drive_t *drive, u8 speed)
+{
+
+        u32 reg = 0, dummy;
+        int unit = drive->select.b.unit;
+
+
+        /* Set the PIO timings */
+        if ((speed & XFER_MODE) == XFER_PIO) {
+                u8 pioa;
+                u8 piob;
+                u8 cmd;
+
+                pioa = speed - XFER_PIO_0;
+                piob = ide_get_best_pio_mode(&(drive->hwif->drives[!unit]),
+                                                255, 4, NULL);
+                cmd = pioa < piob ? pioa : piob;
+
+                /* Write the speed of the current drive */
+                reg = (cs5535_pio_cmd_timings[cmd] << 16) |
+                        cs5535_pio_dta_timings[pioa];
+                wrmsr(unit ? ATAC_CH0D1_PIO : ATAC_CH0D0_PIO, reg, 0);
+
+                /* And if nessesary - change the speed of the other drive */
+                rdmsr(unit ?  ATAC_CH0D0_PIO : ATAC_CH0D1_PIO, reg, dummy);
+
+                if (((reg >> 16) & cs5535_pio_cmd_timings[cmd]) !=
+                        cs5535_pio_cmd_timings[cmd]) {
+                        reg &= 0x0000FFFF;
+                        reg |= cs5535_pio_cmd_timings[cmd] << 16;
+                        wrmsr(unit ? ATAC_CH0D0_PIO : ATAC_CH0D1_PIO, reg, 0);
+                }
+
+                /* Set bit 31 of the DMA register for PIO format 1 timings */
+                rdmsr(unit ?  ATAC_CH0D1_DMA : ATAC_CH0D0_DMA, reg, dummy);
+                wrmsr(unit ? ATAC_CH0D1_DMA : ATAC_CH0D0_DMA,
+                                        reg | 0x80000000UL, 0);
+        } else {
+                rdmsr(unit ? ATAC_CH0D1_DMA : ATAC_CH0D0_DMA, reg, dummy);
+
+                reg &= 0x80000000UL;  /* Preserve the PIO format bit */
+
+                if (speed >= XFER_UDMA_0 && speed <= XFER_UDMA_7)
+                        reg |= cs5535_udma_timings[speed - XFER_UDMA_0];
+                else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
+                        reg |= cs5535_mwdma_timings[speed - XFER_MW_DMA_0];
+                else
+                        return;
+
+                wrmsr(unit ? ATAC_CH0D1_DMA : ATAC_CH0D0_DMA, reg, 0);
+        }
+}
+
+static u8 cs5535_ratemask(ide_drive_t *drive)
+{
+        /* eighty93 will return 1 if it's 80core and capable of
+        exceeding udma2, 0 otherwise. we need ratemask to set
+        the max speed and if we can > udma2 then we return 2
+        which selects speed_max as udma4 which is the 5535's max
+        speed, and 1 selects udma2 which is the max for 40c */
+        if (!eighty_ninty_three(drive))
+                return 1;
+
+        return 2;
+}
+
+
+/****
+ *      cs5535_set_drive         -     Configure the drive to the new speed
+ *      @drive: Drive to set up
+ *      @speed: desired speed
+ *
+ *      cs5535_set_drive() configures the drive and the chipset to a
+ *      new speed. It also can be called by upper layers.
+ */
+static int cs5535_set_drive(ide_drive_t *drive, u8 speed)
+{
+        speed = ide_rate_filter(cs5535_ratemask(drive), speed);
+        ide_config_drive_speed(drive, speed);
+        cs5535_set_speed(drive, speed);
+
+        return 0;