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-rw-r--r--drivers/pcmcia/sa11xx_base.c263
1 files changed, 263 insertions, 0 deletions
diff --git a/drivers/pcmcia/sa11xx_base.c b/drivers/pcmcia/sa11xx_base.c
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index 0000000000..48140ac73e
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+++ b/drivers/pcmcia/sa11xx_base.c
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+/*======================================================================
+
+ Device driver for the PCMCIA control functionality of StrongARM
+ SA-1100 microprocessors.
+
+ The contents of this file are subject to the Mozilla Public
+ License Version 1.1 (the "License"); you may not use this file
+ except in compliance with the License. You may obtain a copy of
+ the License at http://www.mozilla.org/MPL/
+
+ Software distributed under the License is distributed on an "AS
+ IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ implied. See the License for the specific language governing
+ rights and limitations under the License.
+
+ The initial developer of the original code is John G. Dorsey
+ <john+@cs.cmu.edu>. Portions created by John G. Dorsey are
+ Copyright (C) 1999 John G. Dorsey. All Rights Reserved.
+
+ Alternatively, the contents of this file may be used under the
+ terms of the GNU Public License version 2 (the "GPL"), in which
+ case the provisions of the GPL are applicable instead of the
+ above. If you wish to allow the use of your version of this file
+ only under the terms of the GPL and not to allow others to use
+ your version of this file under the MPL, indicate your decision
+ by deleting the provisions above and replace them with the notice
+ and other provisions required by the GPL. If you do not delete
+ the provisions above, a recipient may use your version of this
+ file under either the MPL or the GPL.
+
+======================================================================*/
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+#include <mach/hardware.h>
+#include <asm/irq.h>
+
+#include "soc_common.h"
+#include "sa11xx_base.h"
+
+
+/*
+ * sa1100_pcmcia_default_mecr_timing
+ * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ *
+ * Calculate MECR clock wait states for given CPU clock
+ * speed and command wait state. This function can be over-
+ * written by a board specific version.
+ *
+ * The default is to simply calculate the BS values as specified in
+ * the INTEL SA1100 development manual
+ * "Expansion Memory (PCMCIA) Configuration Register (MECR)"
+ * that's section 10.2.5 in _my_ version of the manual ;)
+ */
+static unsigned int
+sa1100_pcmcia_default_mecr_timing(struct soc_pcmcia_socket *skt,
+ unsigned int cpu_speed,
+ unsigned int cmd_time)
+{
+ return sa1100_pcmcia_mecr_bs(cmd_time, cpu_speed);
+}
+
+/* sa1100_pcmcia_set_mecr()
+ * ^^^^^^^^^^^^^^^^^^^^^^^^
+ *
+ * set MECR value for socket <sock> based on this sockets
+ * io, mem and attribute space access speed.
+ * Call board specific BS value calculation to allow boards
+ * to tweak the BS values.
+ */
+static int
+sa1100_pcmcia_set_mecr(struct soc_pcmcia_socket *skt, unsigned int cpu_clock)
+{
+ struct soc_pcmcia_timing timing;
+ u32 mecr, old_mecr;
+ unsigned long flags;
+ unsigned int bs_io, bs_mem, bs_attr;
+
+ soc_common_pcmcia_get_timing(skt, &timing);
+
+ bs_io = skt->ops->get_timing(skt, cpu_clock, timing.io);
+ bs_mem = skt->ops->get_timing(skt, cpu_clock, timing.mem);
+ bs_attr = skt->ops->get_timing(skt, cpu_clock, timing.attr);
+
+ local_irq_save(flags);
+
+ old_mecr = mecr = MECR;
+ MECR_FAST_SET(mecr, skt->nr, 0);
+ MECR_BSIO_SET(mecr, skt->nr, bs_io);
+ MECR_BSA_SET(mecr, skt->nr, bs_attr);
+ MECR_BSM_SET(mecr, skt->nr, bs_mem);
+ if (old_mecr != mecr)
+ MECR = mecr;
+
+ local_irq_restore(flags);
+
+ debug(skt, 2, "FAST %X BSM %X BSA %X BSIO %X\n",
+ MECR_FAST_GET(mecr, skt->nr),
+ MECR_BSM_GET(mecr, skt->nr), MECR_BSA_GET(mecr, skt->nr),
+ MECR_BSIO_GET(mecr, skt->nr));
+
+ return 0;
+}
+
+#ifdef CONFIG_CPU_FREQ
+static int
+sa1100_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
+ unsigned long val,
+ struct cpufreq_freqs *freqs)
+{
+ switch (val) {
+ case CPUFREQ_PRECHANGE:
+ if (freqs->new > freqs->old)
+ sa1100_pcmcia_set_mecr(skt, freqs->new);
+ break;
+
+ case CPUFREQ_POSTCHANGE:
+ if (freqs->new < freqs->old)
+ sa1100_pcmcia_set_mecr(skt, freqs->new);
+ break;
+ }
+
+ return 0;
+}
+
+#endif
+
+static int
+sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
+{
+ unsigned long clk = clk_get_rate(skt->clk);
+
+ return sa1100_pcmcia_set_mecr(skt, clk / 1000);
+}
+
+static int
+sa1100_pcmcia_show_timing(struct soc_pcmcia_socket *skt, char *buf)
+{
+ struct soc_pcmcia_timing timing;
+ unsigned int clock = clk_get_rate(skt->clk) / 1000;
+ unsigned long mecr = MECR;
+ char *p = buf;
+
+ soc_common_pcmcia_get_timing(skt, &timing);
+
+ p+=sprintf(p, "I/O : %uns (%uns)\n", timing.io,
+ sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, skt->nr)));
+
+ p+=sprintf(p, "attribute: %uns (%uns)\n", timing.attr,
+ sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, skt->nr)));
+
+ p+=sprintf(p, "common : %uns (%uns)\n", timing.mem,
+ sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, skt->nr)));
+
+ return p - buf;
+}
+
+static const char *skt_names[] = {
+ "PCMCIA socket 0",
+ "PCMCIA socket 1",
+};
+
+#define SKT_DEV_INFO_SIZE(n) \
+ (sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
+
+int sa11xx_drv_pcmcia_add_one(struct soc_pcmcia_socket *skt)
+{
+ skt->res_skt.start = _PCMCIA(skt->nr);
+ skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
+ skt->res_skt.name = skt_names[skt->nr];
+ skt->res_skt.flags = IORESOURCE_MEM;
+
+ skt->res_io.start = _PCMCIAIO(skt->nr);
+ skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
+ skt->res_io.name = "io";
+ skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+
+ skt->res_mem.start = _PCMCIAMem(skt->nr);
+ skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
+ skt->res_mem.name = "memory";
+ skt->res_mem.flags = IORESOURCE_MEM;
+
+ skt->res_attr.start = _PCMCIAAttr(skt->nr);
+ skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
+ skt->res_attr.name = "attribute";
+ skt->res_attr.flags = IORESOURCE_MEM;
+
+ return soc_pcmcia_add_one(skt);
+}
+EXPORT_SYMBOL(sa11xx_drv_pcmcia_add_one);
+
+void sa11xx_drv_pcmcia_ops(struct pcmcia_low_level *ops)
+{
+ /*
+ * set default MECR calculation if the board specific
+ * code did not specify one...
+ */
+ if (!ops->get_timing)
+ ops->get_timing = sa1100_pcmcia_default_mecr_timing;
+
+ /* Provide our SA11x0 specific timing routines. */
+ ops->set_timing = sa1100_pcmcia_set_timing;
+ ops->show_timing = sa1100_pcmcia_show_timing;
+#ifdef CONFIG_CPU_FREQ
+ ops->frequency_change = sa1100_pcmcia_frequency_change;
+#endif
+}
+EXPORT_SYMBOL(sa11xx_drv_pcmcia_ops);
+
+int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops,
+ int first, int nr)
+{
+ struct skt_dev_info *sinfo;
+ struct soc_pcmcia_socket *skt;
+ int i, ret = 0;
+ struct clk *clk;
+
+ clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ sa11xx_drv_pcmcia_ops(ops);
+
+ sinfo = devm_kzalloc(dev, SKT_DEV_INFO_SIZE(nr), GFP_KERNEL);
+ if (!sinfo)
+ return -ENOMEM;
+
+ sinfo->nskt = nr;
+
+ /* Initialize processor specific parameters */
+ for (i = 0; i < nr; i++) {
+ skt = &sinfo->skt[i];
+
+ skt->nr = first + i;
+ skt->clk = clk;
+ soc_pcmcia_init_one(skt, ops, dev);
+
+ ret = sa11xx_drv_pcmcia_add_one(skt);
+ if (ret)
+ break;
+ }
+
+ if (ret) {
+ while (--i >= 0)
+ soc_pcmcia_remove_one(&sinfo->skt[i]);
+ } else {
+ dev_set_drvdata(dev, sinfo);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe);
+
+MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
+MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver");
+MODULE_LICENSE("Dual MPL/GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 19:16:35 +0000